JPH0241381Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an actuator for multi-stage damping force switching of a hydraulic shock absorber, and in particular, the present invention relates to an actuator for multi-stage damping force switching of a hydraulic shock absorber, which is designed to improve its durability. This invention relates to improvements in switching actuators.

[Conventional technology]

Various proposals have been made for actuators for multi-stage damping force switching of hydraulic shock absorbers.
For example, there are proposals as shown in FIGS. 7 and 8.

That is, as shown in the longitudinal cross-sectional view of FIG. 7 and the cross-sectional view of FIG. A control valve (not shown) at the lower end of the control rod C is disposed on the fixed support member 1 and allows selected rotation of the control rod C inserted into the piston rod P. The damping force generated in the hydraulic shock absorber main body S can be switched in multiple stages by rotating the shock absorber main body S.

A face gear 2 is connected to the upper end of the control rod C via a connecting member 3, and a pinion gear 4a of a drive motor 4 meshes with a tooth row 2a of the face gear 2. Also,
The face gear 2 is housed in a housing 5 disposed on the support member 1 via an elastic body 1a, and is meshed and fixed to the connection member 3 by a spline or the like. In addition, a bearing 3 interposed on the upper and lower surfaces of the housing 5
The connecting member 3 is inserted through the connecting member 3 so as to be rotatable. The face gear 2 has a rotation base 2b formed in a fan shape.
It has a rising part 2c on the arcuate periphery of the rotating base 2b, and the rising part 2c is inserted into the arcuate guide hole 5a formed in the upper part of the housing 5, and , the tooth row 2a formed at the upper end of the rising portion 2c.
When the pinion gear 4a meshes with the pinion gear 4a, the pinion gear 4a rotates in the directions indicated by arrows a and b in FIG.

Note that the drive motor 4 is connected to the housing 5.
It is placed on the upper surface of the housing 5 and fixed to the housing 5 by appropriate means.

An electromagnet 6 is housed in the lower part of the housing 5, and a stopper plate 7 is rotatably disposed on the upper surface of the electromagnet 6. When the electromagnet 6 is excited, its rotation is prevented by the attractive force from the electromagnet 6, and when the electromagnet 6 is de-energized, it freely slides into contact with the upper surface of the electromagnet 6. It is designed to rotate.

The stopper plate 7 has a pair of protrusions 7a on its upper surface, and the pair of protrusions 7a are inserted into the guide holes 5a of the housing 5. This allows the side surface of the rising portion 2c of the face gear 2 to come into contact with the rotating surface.

According to the conventional proposal formed as above,
It is assumed that when the face gear 2 is rotated in the direction indicated by arrow a in FIG. 8 from the position shown in FIG. 7, the damping force adjustment by the control valve becomes so-called hard, and conversely, It is assumed that when the face gear 2 is rotated in the direction shown by arrow b in FIG. 8, the damping force adjustment by the control valve becomes so-called soft, and the stopper plate 7 is rotated to the state shown in FIG. When the rotation of the face gear 2 in the direction of the arrow b is prevented, the damping force adjustment by the control valve can be made normal.

That is, it becomes possible to switch the damping force in multiple stages.

[Problem that the invention attempts to solve]

However, in the above conventional proposal, when the damping force is switched in multiple stages, the face gear 2 collides with the protrusion 7a of the stopper plate 7 that projects into the guide hole 5a of the housing 5. The side surface of the rising portion 2c collides with the protrusion 7a each time, resulting in a disadvantage that the durability of the face gear 2 or the stopper plate 7 is reduced.

Furthermore, when the damping force is switched in multiple stages, the face gear 2 collides with the protrusion 7a of the stopper plate 7, so that the impact noise becomes louder, causing the inconvenience of generating so-called noise and unpleasant noise.

[Purpose of invention]

Therefore, in view of the above-mentioned circumstances, the present invention prevents the generation of impact noise or makes the impact noise extremely low when switching the damping force in multiple stages, prevents the generation of so-called noise and unpleasant noise, and improves its durability. It is an object of the present invention to provide an actuator for multi-stage damping force switching of a hydraulic shock absorber.

[Means for solving problems]

In order to solve the above-mentioned problems, the configuration of the present invention includes a face gear connected to the upper end side of the control rod, a housing rotatably housing the face gear, and a housing fixed to the housing to accommodate the face gear. In the actuator for multi-stage damping force switching of a hydraulic shock absorber, the actuator has an electromagnet in the housing below the face gear, and a magnet on the top surface of the electromagnet when the electromagnet is energized. It has a stopper plate formed so as to prevent its rotation, and has a projection on the upper surface of the stopper plate that allows it to come into contact with a stopper formed protruding inside the housing. Further, the face gear is provided with a buffer member that can come into contact with the protrusion of the stopper plate when the face gear rotates.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments.

As shown in FIG. 1, the damping force multi-stage switching actuator of the hydraulic shock absorber according to the present invention is disposed at the upper end of the piston rod P of the hydraulic shock absorber main body S, and is inserted into the piston rod P. The selected rotation of the control rod C rotates a control valve (not shown) housed inside the hydraulic shock absorber main body S, thereby reducing the damping generated in the hydraulic shock absorber main body S. The force is switched and adjusted in multiple stages.

In this embodiment, the actuator is disposed on a support member 1 fixed to the upper end of the piston rod P via an elastic body 1a, and is disposed on the upper end side of the control rod C. It has a face gear 2. As shown in FIG. 2, the face gear 2 is connected to the control rod C via a connecting member 3, and the pinion gear 4a of the drive motor 4 meshes with the tooth row 2a of the face gear 2. are doing. Further, the face gear 2 is housed in a housing 5 disposed via an elastic body 1a disposed on the support member 1, and
The connecting member 3 is inserted through a bearing 3a interposed on the upper and lower surfaces of the housing 5, so that it is rotatable. Furthermore, the face gear 2 has a rotation base 2b formed in a fan shape, and the rotation base 2b
It has a rising portion 2c on its arc-shaped peripheral edge, and the rising portion 2c is inserted into an arc-shaped guide hole 5a formed in the upper part of the housing 5, and is formed at the upper end of the rising portion 2c. The pinion gear 4a is configured to rotate in the directions shown by arrows a and b in FIG. 2 by the rotation of the pinion gear 4a that meshes with the tooth row 2a.

Note that the drive motor 4 is connected to the housing 5.
It is placed on the upper surface of the housing 5 and fixed to the housing 5 by appropriate means.

An electromagnet 6 is housed in the lower part of the housing 5, and a stopper plate 7 is rotatably disposed on the upper surface of the electromagnet 6 so as to be in sliding contact therewith. pa plate 7
When the electromagnet 6 is excited, it is attracted by the attractive force from the electromagnet 6 and its rotation is prevented, and when the electromagnet 6 is de-energized, it comes into sliding contact with the top surface of the electromagnet 6. This allows it to rotate freely.

The stopper plate 7 has a pair of protrusions 7a on its upper surface, and the pair of protrusions 7a are formed at an appropriate height so that their upper ends are close to the upper and lower surfaces of the housing 5. ing.
Further, a stopper 5b is provided on the upper and lower surface of the housing 5 to project downward, allowing the projection 7a of the stopper plate 7 to come into contact with the stopper 5b. Note that the projection 7a of the stopper plate 7
The side surface of the rotating base portion 2b of the face gear 2 can be brought into contact with the rotating base portion 2b.

The positional relationship between the pair of protrusions 7a on the stopper plate 7 and the stopper 5b on the housing 5 is as follows.

That is, the pair of protrusions 7a are disposed approximately diagonally on the upper surface of the stopper plate 7, and the rotation of the stopper plate 7 is prevented by the excitation of the electromagnet 6. In this state, the face gear 2 can rotate by an appropriate angle θ, and the stopper 5b is positioned behind the protrusion 7a by an angle θ in the circumferential direction of the stopper plate 7. When the stopper plate 7 is in a freely rotating state, the face gear 2 is formed to be able to rotate at an angle of 2θ.

Therefore, since the face gear 2 is formed as described above, when the face gear 2 is rotated in the direction shown by the arrow a in FIG. 2 from the position shown in FIG. Suppose that the damping force adjustment by the control valve becomes a so-called hard adjustment, and conversely, when the face gear 2 is rotated in the direction shown by arrow b in Fig. 2, the damping force adjustment by the control valve becomes a so-called soft adjustment. In addition, when the stopper plate 7 is prevented from rotating in the state shown in FIG. 2, and the face gear 2 is in the intermediate position state where the rotation in the direction of the arrow b is prevented, the damping by the control valve is performed. It can be assumed that the force adjustment becomes so-called normal.

That is, while the face gear 2 is rotated within the housing 5, the rotation of the face gear 2 is prevented by the pair of projections 7a of the stopper plate 7, and the stopper plate 7 is freely rotated within the housing 5. Since the rotation is rotated or the rotation is prevented, multi-stage rotation control of the face gear 2 becomes possible, and therefore, multi-stage switching of the damping force by the control valve becomes possible.

At that time, the face gear 2 will always come into contact with one of the pair of protrusions 7a of the stopper plate 7, so in the present invention, the face gear 2 is designed to reduce or prevent impact noise. A shock absorbing member 10 is attached thereto.

That is, as also shown in FIG.
In this embodiment, the buffer member 10 is integrally formed with an arcuate elastic body 11. In this embodiment, the elastic body 11 is disposed in a mounting hole 2b' formed to penetrate the thickness of the rotating base 2b in the circumferential direction. Both ends thereof are formed to protrude from the side surface of the rotation base 2b so as to come into contact with a pair of protrusions 7a of the stopper plate 7.

FIG. 4 shows another embodiment of the buffer member 10, which includes an arc-shaped elastic body 11 and a metal piston body 12 adjacent to both ends of the elastic body 11. Therefore, the elastic body 11
is disposed between a pair of pivot bases 2b, and the metal piston body 12 is disposed in a mounting hole 2b' formed to penetrate the thickness of each pivot base 2b in the circumferential direction. A flange 12a is formed on the metal piston body 12, and comes into contact with the side surface of the rotation base 2b to prevent it from falling off.

Further, regarding the arrangement position of the buffer member 10 with respect to the rotation base 2b, as shown in FIG.
It may be fitted on the upper surface side of the rotation base 2b, or furthermore, as shown in FIG. 6, it may be fitted on the lower surface side of the rotation base 2b.

[Effect of idea]

As described above, according to the present invention, the damping force in the hydraulic shock absorber can be switched and adjusted in multiple stages, and it is also possible to reduce the impact noise and prevent the generation of impact noise at the time of switching. Become.

Furthermore, the durability of each member that causes impact noise can be improved, and the durability of the actuator as a whole can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an actuator for multi-stage damping force switching of a hydraulic shock absorber according to the present invention, Fig. 2 is a cross-sectional view thereof indicated by the line - in Fig. 1, and Fig. 3 is an enlarged view showing the face gear. 4 is a plan view of a face gear having a buffer member according to another embodiment; FIGS. 5 and 6 are sectional views of the face gear showing other embodiments of the arrangement position of the buffer member; FIG.
The figure is a vertical cross-sectional view showing a conventional actuator.
The figure is a cross-sectional view thereof, indicated by the middle line - in FIG. 2... Face gear, 2b... Rotating base, 4...
... Drive motor, 5 ... Housing, 5b ... Stopper, 6 ... Electromagnet, 7 ... Stopper plate,
7a...Protrusion, 10...Buffer member, 11...Elastic body, 12...Piston body, C...Control rod, P...Piston rod, S...Hydraulic shock absorber body.

Claims (1)

[Claims for Utility Model Registration] (1) There is an electromagnet in the housing containing the face gear connected to the upper end of the control rod, and the upper surface of the electromagnet is arranged so that the rotation thereof can be controlled when the electromagnet is energized. a stopper plate formed to be stopped, and a projection on the upper surface of the stopper plate that allows contact with a stopper formed protruding within the housing; Furthermore, the actuator for multi-stage damping force switching of a hydraulic shock absorber is characterized in that the face gear is provided with a buffer member that can come into contact with the protrusion of the stopper plate when the face gear rotates. (2) The actuator for multi-stage damping force switching of a hydraulic shock absorber according to claim 1, wherein the stopper is provided protruding from the inner lower surface of the housing. (3) The actuator for multi-stage damping force switching of a hydraulic shock absorber according to claim 1, wherein the shock absorbing member is disposed at the rotating base of the face gear. (4) The actuator for multi-stage damping force switching of a hydraulic shock absorber according to claim 1, wherein the shock absorbing member is integrally formed with an arcuate elastic body. (5) The actuator for multi-stage damping force switching of a hydraulic shock absorber according to claim 1, wherein the damping member comprises an arc-shaped elastic body and a metal piston body adjacent to both ends of the elastic body.