JPH076541U - Position detection mechanism for damping force adjustment actuator - Google Patents

Abstract

(57) [Abstract] [Purpose] A sensor for position detection can be incorporated into a damping force adjusting actuator without affecting the installation of a damping force adjusting shock absorber to a vehicle body. A bottom part 2b of the case 2 facing the bottom surface of the rotor 15 is bulged downward to form a recess 2c in the case 2 of the damping force adjusting actuator 1, and the recess 2c and the bottom surface of the rotor 15 are formed. The sensor 20 for position detection is attached using and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damping force adjusting actuator position detecting mechanism for detecting an operating position of an actuator for adjusting a damping force generated by a damping force adjusting type shock absorber used for the underbody of a vehicle such as an automobile.

[0002]

[Prior art]

 As a position detecting mechanism for a damping force adjusting actuator similar to the one described above, for example, the one disclosed in Japanese Utility Model Application Publication No. 46269 of the 3rd year of the present invention has been already known.

In this damping force adjusting actuator, a position detecting sensor including a permanent magnet as a position detecting element and a reed switch opened and closed by the permanent magnet is used.

Then, the output shaft of the damping force adjusting actuator is projected upward from the actuator, and a permanent magnet, which is one of the elements of the position detecting sensor, is attached to the side surface of the projecting portion of the output shaft. .

Further, on the case of the damping force adjusting actuator, a reed switch, which is the other element of the sensor, is fixedly arranged within the moving range of the permanent magnet, and these permanent magnet and reed switch are The position detection sensor, which consists of, constitutes a position detection mechanism for the damping force adjustment actuator.

[0006]

[Problems to be solved by the device]

 As described above, in the damping force adjusting actuator having the conventional position detecting mechanism, the overall height of the damping force adjusting actuator is increased by the height dimension of the position detecting mechanism.

As a result, when the position detecting actuator is attached to the damping force adjustable shock absorber, the damping force adjusting actuator is additionally reduced by the height dimension accumulated by the position detecting mechanism. Mounting the adjustable shock absorber on the vehicle body It will protrude significantly upward from the bracket.

Therefore, when mounting the shock absorber equipped with the damping force adjusting actuator on the vehicle, the damping force adjusting actuator interferes with the mounting of the shock absorber, and the mounting on the vehicle is restricted. There was a problem that the applicable vehicle models were limited, such as disappearing.

Therefore, the object of the present invention is to detect the position of the damping force adjusting shock absorber with respect to the damping force adjusting actuator of the damping force adjusting shock absorber without affecting the mounting of the damping force adjusting shock absorber to the vehicle body. It is to provide a position detection mechanism that can incorporate a sensor.

[0010]

[Means for Solving the Problems]

 According to the present invention, the above object is to form a recess by bulging the bottom surface of the case facing the lower surface of the rotor downward, and use the recess and the lower surface of the rotor to detect a position detecting sensor. It is achieved by installing.

[0011]

[Action]

 That is, with the above configuration, the position detecting sensor is incorporated in the lower surface portion of the damping force adjusting actuator.

Therefore, even when the damping force adjusting actuator equipped with the position detecting sensor is attached to the damping force adjusting shock absorber, the height dimension of the damping force adjusting actuator does not change at all. It does not project upward.

Therefore, when the shock absorber equipped with the damping force adjusting actuator is mounted on the vehicle, the damping force adjusting actuator does not interfere with the mounting of the shock absorber on the vehicle and the mounting on the vehicle is not restricted. Can be applied to.

[0014]

【Example】

 FIG. 1 shows an embodiment in which the present invention is applied to a damping force adjusting actuator used in a damping force adjusting shock absorber. The damping force adjusting actuator 1 is an outer periphery of a case 2. A pair of mounting brackets 3a and 3b are provided at the facing portions of the surfaces.

On the other hand, a bracket 6 sandwiched between a step portion 4 a and a nut 5 is attached to the piston rod 4 on the damping force adjustable shock absorber (not shown) side.

The damping force adjusting actuator 1 is fixed to the damping force adjusting shock absorber side bracket 6 by fixing the pair of mounting brackets 3a and 3b to the bracket 6 with screws 7a and 7b, respectively. There is.

At the center of the case 2 of the damping force adjusting actuator 1, there are a bearing 8 attached to the upper surface 2a of the case 2 and a bearing 10 attached to the bottom 2b via a guide bush 9. An output shaft 11 is rotatably supported therethrough.

The output shaft 11 is accommodated in the piston rod 4 of the damping force adjustable shock absorber while absorbing the axial misalignment through a tongue and groove type joint 12 that is loosely inserted through the guide bush 9. It is also connected to the control rod 13 for adjusting the damping force.

A rotor 15 magnetized via a magnet bush 14 is integrally attached to the outer periphery of the output shaft 11, and the rotor 15 is surrounded by two-stage stator-side solenoid coils 16 and 17. Are arranged in the case 2.

The solenoid coils 16 and 17 are configured by housing coil bobbins 16b and 17b, which are wound coils 16a and 17a, in yokes 16c and 17c, and these solenoid coils 16 and 17 are vertically stacked. It is fixed at the inner circumference of the case 2 by holding it down with the case 2.

Thus, the rotor 15 and the solenoid coils 16 and 17 on the stator side constitute the damping force adjusting actuator 1 as a PM type stepping motor.

On the other hand, in order to regulate the operating position of the stepping motor, it is usually necessary to initialize it. For example, it may be possible to limit the angle with a mechanical stopper or the like, but with a mechanical stopper, durability and collision noise are problems. Become.

Therefore, a position detecting mechanism for detecting the operating position of the rotor 15 and automatically controlling the stop position of the stepping motor is provided.

In the case of this embodiment, the position detecting mechanism is composed of a switching type position detecting sensor 20 including a permanent magnet 18 and a reed switch 19 as shown in the figure.

However, it goes without saying that another sensor may be used as long as it can detect the position.

The permanent magnet 18, which is one element of the position detecting sensor 20, is attached to the lower surface of the rotor 15 of the damping force adjusting actuator 1 in a state of being molded with the molding material 18a.

Further, a concave portion 2c formed by bulging the bottom portion 2b downward is formed on the bottom portion 2b of the case 2 facing a part of the movement trajectory of the permanent magnet 18, and the concave portion is formed. A reed switch 19, which is the other element of the position detection sensor 20, is housed in 2c, and the permanent magnet 18 and the reed switch 19 constitute a position detection sensor 20 for detecting the operating position of the rotor 15. There is.

FIG. 2 shows an example of a control circuit of the damping force adjusting actuator 1 having the above-mentioned configuration. The stator side solenoid coils 16 and 17 are bipolar drive of the controller 21 provided in the driver's seat. The reed switch 19 of the position detecting sensor 20 is also connected to the circuit 22 and the detection circuit 23 of the controller 21.

Accordingly, when a command signal is given to the bipolar drive circuit 22 of the controller 21 by detecting a change in the vibration state of the running vehicle or manually, a current flows through the solenoid coils 16 and 17 and the solenoids concerned. The coils 16 and 17 are excited and the polarities of the solenoid coils 16 and 17 are alternately switched.

On the other hand, the solenoid coils 16 and 17 act on the rotor 15 to move the rotor 15 step by step according to the switching of the polarities of the solenoid coils 16 and 17, for example, clockwise in a predetermined number of steps. When the rotor 15 is advanced, the rotation of the rotor 15 is transmitted from the output shaft 11 through the joint 12 to the control rod 13 of the damping force adjustable shock absorber.

When the rotor 15 advances by a predetermined number of steps, the switching of the polarities of the solenoid coils 16 and 17 is completed. At this time, for example, if the solenoid coil 16 is kept in an excited state as a reference point. The rotor 15 is initialized and stopped at that position, and the damping force generated by the damping force adjustable shock absorber is adjusted to, for example, a predetermined high damping force value.

If a reverse polarity switching signal is applied to the solenoid coils 16 and 17 through the bipolar drive circuit 22, the rotor 15 advances counterclockwise step by step by a predetermined number of steps, the same as above. Adjust the damping force generated by the damping force adjustable shock absorber to a low damping force value.

However, even if the rotational position of the rotor 15 is controlled as described above, there are cases where the rotor 15 does not move, stops halfway or stops too much for some reason. Conceivable.

In this case, in the former case, the permanent magnet 18 provided on the rotor 15 does not face the reed switch 19 on the case 2 side to close the reed switch 19, and in the latter case. As a result, the reed switch 19 that was once closed will be opened again.

Therefore, in order to detect this, in the embodiment, when the reed switch 19 is closed and the detection signal is not output even if the command signal is given to the bipolar drive circuit 22, it is automatically restarted. A command signal should be given to the bipolar circuit 22 and a reverse command signal should be given to the bipolar circuit 22 when the closing signal disappears after the reed switch 19 is closed and outputs the detection signal. The controller 21 is configured.

As a result, while monitoring the rotational position of the rotor 15 with the reed switch 19, while confirming the operation error of the rotor 15 and the advance angle to the predetermined position, the damping force generated by the damping force adjustable shock absorber is constantly monitored. It will be adjusted to the desired value.

In the above description, the set of position detecting sensors 20 is used to detect the operating position of the rotor 15. However, a plurality of sets of permanent magnets 18 and reed switches 19 are provided, or It is also possible to perform multi-position control in the same manner by detecting the rotational position of the rotor 15 in multiple stages using a plurality of either ones and sequentially outputting control signals with these.

Further, in the above-described embodiment, the recess 2c for accommodating the reed switch 19 is formed in the bottom surface portion 2b of the case 2 by utilizing the space between the piston rod 4 and the bracket 5, but the bracket 6 interferes with it. Other positions may be used as long as they are not the same.

However, when a plurality of reed switches 19 are provided, it is preferable that the recess 2 c be formed in an arc shape or an annular shape by utilizing the space between the piston rod 4 and the bracket 6.

[0040]

[Effect of device]

 As described above, according to the present invention, since the position detecting sensor for detecting the operating position is incorporated in the bottom surface portion of the damping force adjusting actuator, the damping force adjusting actuator is used as the damping force adjusting type shock absorber. No more protruding upward from the mounting part on the car body.

Therefore, when the shock absorber having the damping force adjusting actuator is mounted on the vehicle, the damping force adjusting actuator does not interfere with the mounting of the shock absorber on the vehicle, and the mounting on the vehicle is not restricted. Can be applied.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a damping force adjusting actuator having a position detecting mechanism according to the present invention.

FIG. 2 is a circuit diagram showing an example of a control circuit.

[Explanation of symbols] 1 Actuator for adjusting damping force 2 Case 2b Bottom part 2c Recess 4 Piston rod 6 Bracket 15 Rotor 16,17 Solenoid coil 18 Permanent magnet 19 Reed switch 20 Sensor for position detection

Claims (1)

[Scope of utility model registration request] 1. A bottom surface portion of a case facing a lower surface of a rotor is bulged downward to form a concave portion, and a sensor for position detection is attached using the concave portion and the lower surface of the rotor. Position detection mechanism for actuator for damping force adjustment.