JPH0238111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an actuator for adjusting an orifice in a hydraulic shock absorber.

[Conventional technology]

Fig. 4 shows an example of a conventional hydraulic shock absorber, in which a damping force adjustment valve f having a plurality of orifices e is provided in a piston d that divides the inside of a cylinder a into upper and lower oil chambers b and c, and a piston rod. This is done via a drive shaft i to the rotation shaft h of the valve f that passes through the inside of the valve f.

However, in this case, to fix the spur gear j at the neutral position B, it is necessary to keep the electromagnet k energized and fix the stopper in the keyhole m.
This results in a waste of electricity.

In addition, spur gear j tends to move easily at positions A and C, and to ensure this, DC
It is necessary to keep the motor n energized, which also wastes power and constantly puts a load on the motor, reducing its durability.

Furthermore, a DC motor n and an electromagnet k are connected around the spur gear j.
Since they are separated from each other, the overall size is large, and the cover p that covers it must also be large.

[Problem that the invention attempts to solve]

As mentioned above, in the past, the motor was arranged vertically, which increased the length of the entire hydraulic shock absorber including the actuator, and in places with small installation space, the operating stroke of the hydraulic shock absorber had to be reduced. I have no choice but to.

Furthermore, since the motor is located at an eccentric position with respect to the drive shaft, the motor becomes large in the lateral direction, requiring a large amount of installation space, and is disadvantageous in terms of weight.

[Means for solving problems]

In order to eliminate these drawbacks, in the present invention, a DC motor is placed horizontally on the upper part of the partition plate, and a tower section for accommodating the pinion gear of the motor is provided protruding from one side of the partition plate, and a A support block containing a crown gear that meshes with the pinion gear, a drive shaft, a stopper plate, and an electromagnetic coil is sandwiched between an under case and an outer cover, thereby making the entire actuator more compact. This ensures that the support block is held securely, and in particular maintains proper meshing between the pinion gear and the crown gear, improving accurate operation and durability while facilitating assembly.

The gist of the present invention will be explained below based on the embodiments shown in the drawings.

Fig. 1 is a longitudinal sectional front view of the actuator part showing an embodiment of the hydraulic shock absorber equipped with the actuator of the present invention, Fig. 2 is a plan view with the outer cover removed, and Fig. 3 is an exploded view of the actuator shown in Fig. 1. FIG.

In the drawing, reference numeral 1 denotes a support block, which is made of a non-ferrous metal such as aluminum, and includes a disc-shaped partition plate 2, a tower part 3 protruding from one side of its surface, and the partition plate 2.
The tower part 3 has a hole 3 into which the pinion gear 4 is inserted.
A is provided. The partition plate 2 is also provided with a locking groove 2a that fits into the protrusion 10a of the motor 10, and a guide hole 2b that guides the tooth row 5a of the crown gear 5, which will be described later. It is formed in communication with the portion 3a.

The crown gear 5 is a fixed gear 6a integrated with the drive shaft 6.
The drive shaft 6 has a through hole 5b which engages and fixes the
is equipped with a ball bearing 7 for supporting its end. Next, 8 is a stopper plate, which has protrusions 9 and 9' projecting thereon, and serves as a stopper, which will be described later.

Reference numeral 11 denotes an electromagnet consisting of a coil 11a, a ring 11b, and a coil case 11c.

It should be noted that the aforementioned projections 9, 9' of the stopper plate 8 project into the guide hole 2b of the support block 1 in the same way as the tooth row 5a of the crown gear 5. This makes it possible to stop the drive shaft 6 at a neutral position, as will be described later.

In addition, 12 is the outer cover, 13 is the under case,
14 is an elastic body such as rubber, 15 is an orifice adjustment rod, and 16 is a motor fixing screw.

[Effect]

In the actuator of the present invention having the above configuration, the DC motor 10 is rotated in forward and reverse directions to rotate the drive shaft 6 via the pinion gear 4 and the crown gear 5, and the tooth row 5a is attached to the left and right ends of the guide hole 2b. It will rotate until it stops.

At these two extreme points, the orifice (not shown) is converted into two stages; however, in this case, the electromagnet 11 is not energized, and only the DC motor 10 is used.

Next, move the crown gear 5 to the neutral position (the state shown in the second figure).
To stop the guide hole 2b, the tooth row 5a is first brought into contact with either the left or right end of the guide hole 2b. In FIG. 2, for example, the tooth row 5 is located at the terminal portion 2b' in the counterclockwise direction.
When a is brought into contact with the stopper plate 8, the counterclockwise protrusion 9' of the stopper plate 8 is positioned at the end portion 2b'. When the electromagnet 11 is energized in this state, the stopper plate 8 is attracted and fixed to the electromagnet 11, and the projections 9, 9' are stopped at the respective positions shown in FIG. At this time, the angle created by the protrusions 9 and 9' is
As shown in FIG. 2, the fan-shaped angle β of the crown gear 5
Since it is configured to be the sum of the desired actuator switching angle and the angle α per step,
When the motor 10 is energized and the crown gear 5 is rotated clockwise in FIG. 2, the crown gear abuts against the protrusion 9 and is stopped at the neutral position shown in the second diagram.

That is, the orifice can be adjusted to the third position. At this time, energization is stopped in the order of motor 10 and electromagnet 11.

As described above, the orifice can be adjusted in three stages.

[Effect of idea]

As described above, according to the present invention, the DC motor is installed horizontally, the drive shaft is rotated through the crown gear, and the entire actuator can be constructed compactly by using the disc-shaped stopper plate and the annular electromagnet. Since these are assembled to the support block, the whole structure is solid, and as shown in the first figure, the outer cover 12 and the under case 13 are sandwiched between the outer cover 12 and the under case 13 via an elastic body 14 such as rubber. This makes it possible to reliably eliminate the conventional disadvantage of loosening of the motor fixation and causing problems in meshing between the pinion gear 4 and the tooth row 5a, thereby improving durability.

Furthermore, the provision of the support block 1 facilitates assembly, and together with the robustness of the above-mentioned structure, it has brought about great benefits in practical use.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the actuator portion showing an embodiment of a hydraulic shock absorber equipped with the actuator of the present invention, Fig. 2 is a plan view with the outer cover removed, and Fig. 3 is an exploded perspective view of the actuator.
FIG. 4 is a partially cutaway front view showing an example of a conventional hydraulic shock absorber, FIG. 5 is a partially cutaway enlarged side view of the actuator shown in FIG. 4, and FIG. 6 is a cross-sectional plan view thereof. DESCRIPTION OF SYMBOLS 1... Support block, 2... Partition plate, 3... Tower part, 4... Pinion gear, 5... Crown gear, 6...
Drive shaft, 7...Ball bearing, 8...Stopper plate, 9, 9'...Protrusion, 10...DC motor, 11...Electromagnet, 12...Outer cover, 1
3...Under case, 14...Elastic body.

Claims (1)

[Scope of utility model registration request] A DC motor is placed horizontally on the upper part of the partition plate, and a tower part that accommodates a pinion gear fixed to the output shaft of the motor is provided protruding from one side of the partition plate, and an arcuate guide hole is bored in the plate. , an annular stopper plate having two protrusions disposed at a predetermined distance from each other in the circumferential direction at the bottom of the partition plate and loosely fitting into the guide hole;
It has an electromagnet that attracts the stopper plate and stops and fixes the protrusion at a predetermined position in the guide hole, and a row of teeth that protrudes from the guide hole and meshes with the pinion gear, and is formed integrally with the drive shaft, and is located at both ends of the guide hole. Alternatively, a multi-stage switching actuator for a hydraulic shock absorber, characterized in that a support block containing a crown gear that comes into contact with and stops the protrusion stopped at the predetermined position is clamped and fixed between the under case and the outer cover. .