JPH031637Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a rotary actuator for controlling a rotational angle that controls the position of a set angle, for example, a suspension system system that controls the damping force of a vehicle in three stages. This relates to a rotary actuator that switches the oil passage in an absorber, and in particular, it does not have a feedback system.
The present invention relates to a rotary actuator for rotational angle control that can be accurately stopped at any three set positions.

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

[Problem that the invention attempts to solve] After detecting the angle with the former rotation angle sensor,
In devices that turn off the power by feeding back the detected value, there is a problem in that it takes a long time to stop at a set angle due to the inertia of the rotating part, and the response speed is not good.

In addition, 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, generally, as a means for mechanically stopping 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 rotation 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. The stopper plate 3 is screwed onto the end of the output shaft 1 with a nut 4. An engagement hole 3a for a plunger stopper 6 is bored in the stopper plate 3, and the plunger stopper 6, which is moved up and down by the force of a solenoid 5 at a set position, is fitted 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. , solenoid 5
If a timing delay occurs, or a timing delay in descending to the engagement hole 3a side due to a change in the contact resistance of the plunger stopper 6, even if the power to the motor that rotates the output shaft 1 is turned off, Due to this inertia, there were problems such as cases in which the engagement hole 3a of the stopper plate 3 and the plunger stopper 6 could not be engaged.

Also, usually, considering the case where the engagement hole 3a and the plunger stopper 6 cannot be engaged,
Since the plunger stopper 6 comes into contact with the stopper plate 3 immediately before it is fitted into the engagement hole 3a, the area around the engagement hole 3a of the stopper plate 3 may be worn or the surface may be rough. There was a problem in that the contact resistance became large and the stopper plate 3 was stopped before the plunger stopper 6 engaged with the engagement hole 3a.

In order to solve this problem, the applicant has provided 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, and the stopper member By providing play in the connection between the output shaft and the output shaft to absorb the difference between the position that restricts counterclockwise rotation and the position that restricts clockwise rotation, the convex portion of the stopper member and the plunger stopper come into contact with each other. The resulting stop position of the output shaft is always a predetermined intermediate stop position regardless of the left and right rotation direction, and the sector gear contacts the end stopper of the housing to set the left rotation limit and right rotation limit of the output shaft. Application was filed for a rotary actuator for controlling the rotation angle using a three-stage control method (patent application No. 59-067283).
did.

The rotary actuator for controlling the rotation angle according to the method of the prior application absorbs the difference between the position where left rotation is restricted and the position where right rotation is restricted by coupling the stopper member to the output shaft. However, since the diameter of the output shaft is usually not large, when the plunger stopper and the stopper member come into contact with each other and the stopper member stops the rotation of the output shaft, a large stress is generated between the stopper member and the output shaft. Therefore, there was a desire to develop a mechanism to reduce stress.

Therefore, the present invention eliminates the problems of the conventional means of mechanically stopping rotation at the set position, and uses play to absorb the difference between the position that restricts left rotation and the position that restricts right rotation. The object of the present invention is to provide a rotary actuator for rotational angle control that can reduce the burden on the constituent members of the abutment part having a stopper function and reduce wear and deformation of the abutment part.

[Means for Solving the Problems] The rotary actuator for rotation angle control according to the present invention includes a main gear that transmits left rotation and right rotation to an output shaft, and a rotary actuator that is rotatably attached concentrically to the main gear. a stopper plate provided on the main gear, a convex portion disposed on the stopper plate, a plunger stopper disposed so as to be able to come into contact with the convex portion, and a plunger stopper disposed on the main gear that connects the main gear and the stopper plate. The plate is provided with a recessed part that can be rotated by a predetermined amount relative to the plate.

[Operation] In the present invention, the pinion 11 attached to the rotating shaft of the DC motor 10 rotates the main gear 12 fixed to the output shaft 13. When the main gear 12 rotates and the plunger stopper 38 and the convex portion 55a of the stopper plate 55 come into contact,
The rotation of the output shaft 13 is stopped at the position where the convex portion 55a of the stopper plate 55 and the regulating end of the recessed notch 12a of the main gear 12 come into contact. At this time,
The rotation angle of the output shaft 13 becomes an intermediate stop position.

Further, when the plunger stopper 38 and the convex portion 55a of the stopper plate 55 rotate without contacting each other, the regulating end 21a or 21b of the upper housing 21 and the convex portion 55a of the stopper plate 55 rotate.
a comes into contact with the stopper plate 5.
5 and the concave notch 12 of the main gear 12.
The left rotation or right rotation of the output shaft 13 is stopped at the position where the regulating end of a is brought into contact. At this time, the rotation angle of the output shaft 13 is angularly displaced to the left or right by an arbitrary angle around the intermediate stop position.

In the above state, when the convex portion 55a of the stopper plate 55, which is rotatable and concentric with the main gear 12 fixed to the output shaft 13, rotates to the left, the stopper plate 55 rotates to the left and comes into contact with the plunger stopper 38. A recessed portion 12a provided in the main gear 12 and rotatable by a predetermined amount determines the error in the stop position between the intermediate stop position when the gear contacts and the intermediate stop position when the main gear 12 rotates to the right and makes contact.
It can be corrected by In this way, regardless of the direction of rotation, the main gear 12
can always be stopped at three fixed positions. Moreover, when the plunger stopper 38 and the convex portion 55a of the stopper plate 55 come into contact with each other and stop at the intermediate stop position, that stress is generated in the main gear 12, which has a larger diameter than the output shaft 13.
The stress can be made smaller than when contact is made at a small diameter portion.

[Example] Fig. 1 is a longitudinal cross-sectional view showing a rotary actuator for controlling rotational angle according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line X-X of Fig. 1, and Fig. 3 is a cross-sectional view taken along line X-X of Fig. It is a bottom view showing three stages of rotation angle states of the present embodiment as well.

In the figure, a DC motor 10 capable of forward and reverse rotation is shown.
has a pinion 11 fixed to its rotating shaft,
The pinion 11 meshes with a main gear 12 to which an output shaft 13 is attached. The DC motor 10
is attached to the upper housing 21, and the rotation and rotational direction of the DC motor 10 are controlled on/off by a lead wire 23. Incidentally, capacitors 25 and 26 for noise removal are connected between both terminals of the DC motor 10 and ground.

Also, a solenoid 30 is provided in the upper housing 21.
is installed. The solenoid 30 is constructed by inserting a coil 33 wound around a non-magnetic bobbin 32 into a sleeve 31 made of non-magnetic metal, etc., and includes a yoke 34 and a movable iron core 39 disposed at the end of the sleeve 31. , a magnetic path is formed between the fixed iron core 35 and the yoke 36. A guide ring 37 is inserted into the sleeve 31, and a movable iron core 39 is inserted through the guide ring 37. In order to arrange the plunger stopper 38 on the axis of the sleeve 31, a movable iron core 39 attached to the plunger stopper 38 is inserted as a stopper guide. A compression spring 40 is held between the movable iron core 39 and the fixed iron core 35, and when the coil 33 is in a non-energized state, the compression spring 40 positions the plunger stopper 38 at its upper limit. At this time, a rubber ring 41 is vulcanized and bonded to the guide ring 37 so that the guide ring 37 and the movable iron core 39 do not come into contact with each other and generate noise. Similarly, when the coil 33 is in an excited state, the stopper guide auxiliary member 3 sets the lower limit of the movable iron core 39.
A rubber ring 42 is vulcanized and bonded so that the ring 9a does not come into contact with the ring 9a and generate noise. Note that the solenoid 3
The 0 coil 33 is controlled to be energized or de-energized by the lead wire 24. Therefore, lead wire 2
By turning on and off the current No. 4, the plunger stopper 38 moves up and down.

The upper housing 21 includes a rotating shaft 50.
is pivoted. The main gear 1 is attached to the rotating shaft 50.
2 is firmly fixed by insert molding or the like. The rotating shaft 50 and the output shaft 13 are connected by a spring pin 51, and the output shaft 13
A C-shaped spring or the like is used to prevent this from coming off in the vertical direction. A coupling groove 13a is formed in the lower part of the output shaft 13, through which it is directly connected to a damping force or spring constant control rod that changes the damping force or spring constant of the suspension. Acts as a rotary actuator for rotation angle control.

A stopper plate 55 is fitted into a fitting groove formed concentrically on the main gear 12 in its plane. The stopper plate 55 is formed with a convex portion 55a that comes into contact with the plunger stopper 38, and the convex portion 55a is connected to a fitting groove formed in the main gear 12 and a concave notch 12 that is rotatable by a predetermined amount.
a, and the movement of the convex portion 55a of the stopper plate 55 is restricted by the restricting end portions at both ends of the recessed notch 12a.

As shown in the explanatory diagram of the contact state between the convex part of the stopper plate and the plunger stopper in FIG. , main gear 1
A straight line connecting the center of the output shaft 13 and the point where the restricting end of the concave notch 12a provided in 2 and the convex part 55a of the stopper plate 55 come into contact (this may be a contact line or a contact surface). The forming angle θ is determined as follows.

First, connect the main gear reference line Z-Z, the point where the plunger stopper 38 contacts the convex portion 55a of the stopper plate 55 (this may be a contact line or contact surface), and the center of the output shaft 13. Let the angle formed by the diagonal line be θ1. At this time, the distance between the abutting point and the center of the output shaft 13 is defined as r1. Then, the convex portion 5 of the stopper plate 55
5a and the plunger stopper 38, the point where the convex portion 55a abuts the regulating end of the recessed notch 12a provided in the main gear 12, and the output shaft 13.
Let θ2 be the angle formed by a straight line connecting the center of . At this time, the distance between the abutting point and the center of the output shaft 13 is defined as r2.

Therefore, the angle θ of the recessed part that can rotate by a predetermined amount on one side of the main gear reference line Z-Z is θ=
(θ1 + θ2), plunger stopper 38
is in contact with the convex portion 55a of the stopper plate 55 at a predetermined contact distance r1 and the main gear reference line Z-
The angle θ1 with respect to Z, the point where the regulating end of the concave notch 12a provided in the main gear 12 and the convex portion 55a of the stopper plate 55 abut at a predetermined abutting distance r2, and the abutting distance r1 The angle θ of the recessed portion that can rotate by a predetermined amount on one side of the main gear reference line Z-Z is determined by the angle θ2 between the center of the output shaft 13 and the point of contact between the main gear reference line ZZ and the center of the output shaft 13.

The angle θ' of the recessed portion that can rotate by a predetermined amount on the opposite side of the main gear reference line Z-Z can also be determined in the same manner. In addition, the angle θ of the recessed part that can be rotated by a predetermined amount on one side of the main gear reference line Z-Z
and the angle θ' of the other recessed portion that can be rotated by a predetermined amount do not necessarily have to be set to the same angle, but can be set independently depending on the suspension system. Therefore, main gear 1
The angle of the concave notch between the regulating ends of the concave notch 12a provided at 2, through which the convex part 55a of the stopper plate 55 can rotate by a predetermined amount, is (θ+θ').

Strictly speaking, a cap-shaped rubber cushion 56 is attached to the convex portion 55a of the stopper plate 55 to prevent the generation of sound when it comes into contact with the plunger stopper 38, but the rubber cushion 56 Since it is slightly recessed when it comes into contact with the plunger stopper 38, the values of the two points where the convex portion 55a of the stopper plate 55 comes into contact have a value that takes into account the recess.

Further, the lower housing 20 is attached to the upper housing 21 by positioning pins 61 and 62, and receives the rotating shaft 50 and the main gear 12 housed within the upper housing 21. The rotating shaft 50 is disposed inside the lower housing 20.
A thrust bearing 63 is provided to reduce contact resistance with the main gear 12. The lower housing 20 is connected to the output shaft 1 from its central portion.
3 has been led out and the output shaft 13 is directly connected to the control rod 75 (see Fig. 5), it can be attached to the suspension housing using the mounting holes 64 and 65 shown in Figs. 2 and 3. It will be done.

The upper end side of the output shaft 13, that is, the end side where the output shaft 13 and the rotating shaft 50 are connected by the spring pin 51, is sealed with a shaft cover 69, and is further attached to the upper housing 21. The DC motor 10, the solenoid 30, and the shaft cover 69 that have been installed are covered by the cover 22.

The fifth example shows an example in which the rotary actuator for controlling the rotation angle of this embodiment is used in a suspension system that controls the damping force of a vehicle in three stages.
It is shown in the main part sectional view of the figure.

In the figure, the lower end of the shock absorber outer shell 71 has a lower nut joint 72 that is attached to the axle with a lower stay. While the lower nut bolt joint 72 is attached to the axle, an upper nut bolt joint to the upper part of the shock absorber piston rod 70 is attached to the frame by an upper stay. A spring is interposed between the frame and the axle, and the shock absorber and spring constitute a suspension system.

An inner cylinder 73 is built inside the shock absorber outer shell 71, and a known base valve assembly is provided at the lower end of the inner cylinder 73. A piston rod valve assembly 74 is provided at the lower end of the absorber piston rod 70, and the piston rod valve assembly 74 is connected to a control rod inserted into the axis of the absorber piston rod 70. The end of 75 and a rotary valve 76 are connected. The upper end of the control rod 75 is clamped to the coupling groove 13a of the output shaft 13 of the rotary actuator for controlling the rotation angle, so that the rotation of the output shaft 13 of the rotary actuator for controlling the rotation angle is controlled. This appears as the rotation of the rotary valve 76.

The piston rod valve assembly 74 includes
A large diameter oil passage 77 that passes oil from the bottom to the top of the piston rod valve assembly 74 during bounce, and a small diameter oil passage 78 that passes oil from the top to bottom of the piston rod valve assembly 74 during rebound. It further has an orifice A, an orifice B, and an orifice C that control the opening and closing of the oil bypass passage passing through the piston rod valve assembly 74 in multiple stages of "high,""medium," and "low." are doing.

The above-mentioned "high" means that the damping force of the shock absorber of the suspension system is maximized. Similarly, the above-mentioned "low" means that the damping force of the shock absorber of the suspension system is made the lowest. The "medium" refers to the damping force of the shock absorber of the suspension system.
It is set between the above-mentioned "high" and the above-mentioned "low".

Note that the orifice A is the rotary valve 7.
6 orifice 76A and the absorber piston rod 70 orifice 70A, and the orifice B is the orifice 76B of the rotary valve 76 and the orifice 70B of the absorber piston rod 70.
The orifice C is connected to the orifice 76C of the rotary valve 76 and the absorber piston rod 7.
0 orifice 70C.

The rotary actuator for rotational angle control of this embodiment configured as described above can operate as follows. This will be explained using FIGS. 6 and 7.

Figure 6a shows orifice A along the X1-X1 cutting line in Figure 5, Figure 6b shows orifice B along the X2-X2 cutting line in Figure 5, and Figure 6c shows the orifice B along X3-X3 in Figure 5. It is a sectional view showing the open and closed state of the orifice C along a cutting line.

FIG. 7 is a sectional view of the main gear seen from below, illustrating the setting state of the rotation angle of the rotary actuator for controlling the rotation angle of this embodiment.

First, in FIG. 7, when the DC motor 10 rotates, the main gear 12 passes through the pinion 11.
Rotate counterclockwise to remove the concave notch 12a of the main gear 12.
The convex portion 55a of the stopper plate 55 comes into contact with the restricting end 21a of the upper housing 21, as shown in FIG. 7a. At this time, the coupling groove 13a of the output shaft 13 is -60° as shown in the figure.
It has an inclination of degrees.

When the output shaft 13 is in this state, the oil passage in the shock absorber of the suspension system that controls the damping force of the vehicle in three stages is such that the orifice A is closed and the orifice B is closed as shown in FIG.
is open and orifice C is closed.

Therefore, when bouncing, an oil passage is formed from the large diameter passage 77 of the piston rod valve assembly 74 and the central part 79 of the rotary valve 76 via the orifice B, and when rebounding, an oil passage is formed from the small diameter passage 78 and the orifice B to the rotary valve. An oil passage is formed through the central portion 79 of 76 .

That is, by rotating the main gear 12 to the left, the convex portion 55a of the stopper plate 55 is connected to the upper housing 21.
By coming into contact with the regulating end 21a of the suspension system, the damping force of the suspension system can be guided to the "inside" side.

Further, when the solenoid 30 is energized, the plunger stopper 38 is lowered, the DC motor 10 is rotated, and the main gear 12 is rotated clockwise, the contact resistance between the two causes the main gear 1 to change as shown in FIG. 7a.
The stopper plate 55 rotates due to the positional relationship between the plunger stopper 38 and the stopper plate 55, and first, the plunger stopper 38 and the convex portion 55a of the stopper plate 55 come into contact, and the movement of the stopper plate 55 is then stopped. I am made to do so. However, when the main gear 12 continues to rotate, the stopper plate 55 stopped by the plunger stopper 38 comes into contact with the regulating end of the concave notch 12a of the main gear 12.
The main gear 12 is stopped and assumes the position shown in FIG. 7b. At this time, the coupling groove 13a is positioned as shown in the figure.

When the output shaft 13 is in this state, the oil passage in the shock absorber of the suspension system that controls the damping force of the vehicle in three stages is connected to orifice A, orifice B, and orifice C as shown in FIG. In this state, orifice A, orifice B, and orifice C are all closed.

Therefore, during bounce, oil flows through the large diameter passage 77 of the piston rod valve assembly 74, and during rebound, oil flows through the small diameter passage 78, which reduces the resistance to vertical movement of the absorber piston rod 70. will also be the highest.

In this way, when the main gear 12 is rotated clockwise to bring the plunger stopper 38 into contact with the convex portion 55a of the stopper plate 55, the output shaft 13 is moved to the seventh position.
It can be stopped in the "high" state shown in Figure b.

With the solenoid 30 de-energized and the plunger stopper 38 raised, the DC motor 1
0 and the main gear 12 is rotated clockwise, the convex portion 55a of the stopper plate 55 and the regulating end 21b of the upper housing 21 come into contact, and the regulating end of the concave notch 12a of the main gear 12 When they come into contact with each other, the rotation of the main gear 12 is stopped and the position shown in FIG. 7c is reached. At this time, the coupling groove 13a has an inclination of +60 degrees as shown in the figure.

When the output shaft 13 is in this state, in the oil passage in the shock absorber of the suspension system, orifice A in FIG. 6 is open, and orifice B and orifice C are open.

Therefore, at the time of bouncing, air flows from the large diameter passage 77 of the piston rod valve assembly 74 and the orifice C to the central portion 79 of the rotary valve 76.
Similarly, oil will flow from the central portion 79 of the rotary valve 76 via orifice A and orifice B. Small diameter passage 78 during rebound
and the rotary valve 7 from the orifice A and the orifice B to the central part 79 of the rotary valve 76.
6 through the orifice C, the resistance when the absorber piston rod 70 moves up and down becomes the lowest.

That is, by rotating the main gear 12 clockwise, the convex portion 55a of the stopper plate 55 is aligned with the upper housing 21.
By coming into contact with the regulating end 21b of the suspension system, the damping force of the suspension system can be guided to the "low" side.

When the main gear 12 is rotated counterclockwise from the "low" state to stop the output shaft 13 in the "high" state as shown in FIG. , when the plunger stopper 38 is lowered, the plunger stopper 38 and the convex portion 55a of the stopper plate 55, as shown in FIG. 7d, as in the case of FIG. 7b.
After coming into contact with the convex portion 55 of the stopper plate 55
a, the main gear is stopped, and the coupling groove 1 of the output shaft 13 attached to the main gear 12
3a is the vertical central axis direction, and the state of the output shaft 13 is the same as that in FIG. 7b. That is, when the main gear 12 is rotated counterclockwise to bring the plunger stopper 38 into contact with the convex portion 55a of the stopper plate 55, the suspension system can be brought to the "high" state.

As mentioned above, the angular displacement of the coupling groove 13a of the output shaft 13 changes the state shown in FIG. 7a to the "medium" state of the suspension system, similarly the state shown in FIG. 7c to the "low" state, and By setting the states shown in FIG. 7 b and d to the three "high" states, the DC motor 10 and the plunger stopper 38 are controlled so that the main gear 12 is always kept at the fixed position regardless of the rotating direction. It can be stopped in the "medium" state, "high" state, or "low" state.

According to this embodiment, the housing 21 sets the left rotation limit and right rotation limit of the output shaft, and the output shaft 1
a stopper plate 55 that is rotatable concentrically with the main gear 12 fixed to the main gear 12;
In the rotary actuator for controlling the rotation angle, the main gear 1 is provided with a convex portion 55a of a stopper plate 55 and a plunger stopper 38, which stop the rotation of the main gear 1 at a set position by contact.
2 and the stopper plate 55, the convex portion 55a of the stopper plate 55 and the plunger stopper 38 can be rotated by a predetermined amount to change the difference between the position where counterclockwise rotation is restricted and the position where clockwise rotation is restricted. This is corrected by a recessed part. Therefore, by coupling the stopper member and the output shaft, the stress acting on the stopper mechanism is reduced compared to a method that absorbs the difference between the position that restricts left rotation and the position that restricts right rotation. be able to.

That is, since the contact between the stopper plate 55 and the plunger stopper 38 can be set at a position outside the inner diameter of the main gear 12, the stress when the stopper plate 55 and the plunger stopper 38 contact is reduced. It is smaller and reduces the burden on the components of the contact part that has a stopper function, reducing wear and tear on the contact part.
In addition to reducing deformation, the stopper plate 55 and the plunger stopper 38 are not deformed due to stress.

By reducing the stress of the stopper mechanism, when the rotary actuator for rotation angle control of the present invention is used in a suspension system that controls the damping force of a vehicle in three stages, it is possible to reduce the stress on the DC motor and shock absorber. Can be used for control rods with large moment of inertia. When the rotary actuator for rotational angle control of the present invention is implemented as a suspension system that controls the damping force of a vehicle in three stages, the damping force or spring constant control system that controls the damping force or spring constant of the suspension can be used. It is possible to reduce the error in the stopping position of the shaft for turning the drive.

Although the control of the DC motor 10 and the solenoid 30 is not described in detail in the above embodiment, when the convex portion 55a of the stopper plate 55 is separated from the regulating end 21a or 21b and comes into contact with the plunger stopper 38, When the state is “high”, the DC motor 10
The solenoid 30 may be set to the energized state simultaneously with the activation of the solenoid 30, or the energization of the solenoid 30 may be delayed slightly. Further, the cut-off timing of the DC motor may be controlled by the time immediately before the convex portion 55a of the stopper plate 55 comes into contact with the plunger stopper 38 or the regulating end 21a or the regulating end 21b, or the timing may be controlled at the time immediately before the convex portion 55a of the stopper plate 55 comes into contact with the plunger stopper 38 or the regulating end 21a or the regulating end 21b. It is also possible to detect the lash current when it is connected and cut it off.

In any case, in this embodiment, the plunger stopper 38 is lowered and the convex portion 5 of the stopper plate 55 is
Because it waits for the rotation of 5a and brings it into contact,
There is sufficient timing for lowering the plunger stopper 38, and the degree of freedom in designing the control of the DC motor 10 and the solenoid 30 can be increased.

In the above embodiment, the "medium" state and the "low" state
Stopping the condition at the regulating end 21 of the upper housing 21
a or 21b, but is not limited to the upper housing 21, and the lower housing 2
0 may be used, or other members attached to the upper housing 21 and lower housing 20 may be used.

Further, although the main gear 12 and the output shaft 13 are connected via the rotating shaft 50, the rotating shaft 50 does not necessarily need to be interposed therebetween. For example, the main gear 12 and the rotating shaft 50 may be formed integrally, or the output shaft 13 may have the function of the rotating shaft 50. Furthermore, the output shaft 13 is connected to the coupling groove 1.
3a, the output shaft 13 can also be configured as a control rod.

Since the DC motor 10 and the solenoid 30 do not have a particularly new structure when implementing the present invention, they may be a conventionally used DC motor,
Needless to say, a solenoid can be used.

[Effects of the invention] As described above, the invention includes a main gear that is rotated by a DC motor and that rotates the damping force or spring constant control rod of the suspension, and a main gear that can be rotated by a predetermined amount. It consists of a stopper plate attached with a set range, and a plunger stopper that is driven by a solenoid and stops the stopper plate by coming into contact with the stopper plate, and the main part is the range in which the stopper plate can be rotated by the predetermined amount. The angle range is determined to include the regulating end of the concave notch of the gear. Therefore, since the contact between the stopper plate and the plunger stopper can be set at a position outside the inner diameter of the main gear, the stress when the stopper plate and the plunger stopper come into contact with each other is reduced. The load on the constituent members of the abutting part having a stopper function is reduced, wear and deformation of the abutting part are reduced, and the stopper plate and the plunger stopper are not deformed due to stress. The difference between the position that restricts left rotation and the position that restricts right rotation can be absorbed by the play, and errors in the stop position of the control rod can be reduced. Furthermore, since the plunger stopper is disposed on a different axis from the main gear, the main gear and the plunger stopper can be arranged side by side, and the overall size can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a rotary actuator for controlling rotational angle according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line X-X of FIG. 1, and FIG. Fig. 4 is an explanatory diagram of the state of contact between the stopper plate and the plunger stopper shown in the embodiment of the present invention, and Fig. 5 is a bottom view showing the three stages of rotation angle states. Figure 6 is a cross-sectional view of the main parts of an example in which a rotary actuator for rotation angle control is used in a suspension system that controls the damping force of a vehicle in three stages.
A sectional view showing the opening and closing state of the orifice when cut along X1, X2-X2, and X3-X3, and FIG. 7 explains the setting state of the rotation angle of the rotary actuator for controlling the rotation angle of the embodiment of the present invention. The explanatory drawing, FIG. 8, is a perspective view showing a conventional stopping means of a rotary actuator for controlling a rotation angle. In the figure, 10... DC motor, 12... Main gear, 13... Output shaft, 20... Lower housing, 21... Upper housing, 30... Solenoid, 38... Plunger stopper, 55... Stopper. It is a plate. In addition, in the figures, the same reference numerals and symbols indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] A main gear that transmits left and right rotations to an output shaft connected to a control rod, a stopper plate that is concentric with the main gear and rotatably attached, a convex portion disposed on the stopper plate; a plunger stopper disposed on a different axis from the main gear so as to be able to come into contact with the convex portion; a plunger stopper disposed on the main gear and disposed on the main gear; A rotary actuator for controlling a rotation angle, comprising a gear and a recessed part that allows the stopper plate to rotate by a predetermined amount relative to each other.