JPH01150034A - Dashpot - Google Patents

Abstract

PURPOSE:To arbitrarily obtain the control characteristic of an opponent equipment by providing an electromagnet providing in its plunger a stem receiving force of the opponent equipment, position detector of the stem and an electric circuit supplying a driving current to a coil of the electromagnet. CONSTITUTION:A throttle valve 2, controlling an intake amount, and a lever 3, receiving dashpot action in not more than a preset opening of the valve 2, are secured to a throttle valve shaft 1. A plunger 6, arranged in the center of a coil 5 of an electromagnet 4 performing the dashpot action, has a spring receiver 7 and a stopper 8. A brush 14 of a potentiometer, constituting a position detector 13, is mounted to a connecting rod 12. An electric circuit 18, which supplies to the coil 5 of the electromagnet 4 a driving current in accordance with a position of the stem 11, is provided. Electromagnetic force of the electromagnet 4 serves as the resistance of action by an opponent equipment. In this way, the opponent equipment enables its control characteristic to be arbitrarily obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application for sedentary work) The present invention relates to a dashpot used to buffer force and reduce operating speed, and is mainly used for
It is used to control the closing of the intake control throttle valve of this engine.

(Prior Art) There are two types of dashpots, pneumatic type and liquid type, which use the throttling effect of fluid to buffer force and reduce operating speed.

The pneumatic type has diaphragm 2 as shown in Figure 4.
The stem 22 is protruded from the stem 1 and the return spring 24 is inserted into the buffer chamber 23 formed on the opposite side, and the buffer chamber 23 is opened toward the throttle 19 and the buffer chamber 23 (by the check valve 26). It is configured to communicate with the atmosphere, and when the sword acts on the stem 22, the air in the buffer chamber 23 is squeezed z5
gradually released into the atmosphere.

The liquid type has a trap and diaphragm 3 as shown in Figure 5.
1 stem 321g! : Protruding buffer chamber 33 on the opposite side
The liquid in the buffer chamber 33 passes through the throttle 34 and gradually flows through the throttle 34 and the storage fi ff 136 when a force is applied to the stem 32. When the liquid is released into the liquid storage chamber 36 and the force is no longer applied to the stem 32, the diaphragm 37 of the liquid storage chamber 36 is pushed by the return spring 38, thereby squeezing the liquid 3.
4 and the check valve 35 to the buffer chamber 33.

Incidentally, there are those that use a piston instead of a diaphragm, and those that move liquid by bypass, but the two-acting thick-fill method is the same.

(Problem to be Solved by the Invention) However, in the pneumatic dashpot as described above, the position of the stem 22 is not constant due to initial distortion (therefore, there is a drawback that there is a large dispersion in the timing of the start of operation). Additionally, liquid dashpots have the disadvantage that the sealed liquid tends to vary in characteristics due to the influence of temperature, such as the viscosity of the liquid changing or the generation of bubbles depending on the temperature.

Furthermore, since these dashpots provide resistance due to the fluid throttling effect from the start to the completion of the operation, they act uniformly over the entire length of the target device to control the target device, making it possible to control the target device at will. characteristics that cannot be controlled.

In view of the above circumstances, the present invention was invented with the object of providing a dashpot that can control a partner device with arbitrary characteristics without variation.

(Means for Solving the Problems) The present invention includes an electromagnet in which a plunger is provided with a stem that receives the force of a partner device, a position detector for the stem, and a coil of the electromagnet that is driven in accordance with the position of the stem. The device is provided with an electric circuit that supplies current, and the electromagnetic force of the electromagnet acts as a resistance to the operation of the other device, thereby solving the above problem.

(Function) After the other device comes into contact with the stem, a drive current corresponding to the position is supplied to the coil, and the axial thrust applied to the plunger according to the electromagnetic force acts as resistance and reduces the operating speed of the other device. . By appropriately setting the characteristics of the drive current, the control characteristics of the partner device can be made arbitrary.

(Example) Embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an example in which the present invention is implemented to reduce the closing speed for exhaust control when the intake control throttle valve of the engine closes. A throttle valve 2 which opens and closes the passage to control the intake air amount, and a lever 3 which receives a dashpot action when the opening is below the set opening are fixed.

A plunger 6 placed at the center of the coil 5 of the electromagnet 4 that performs a dashpot action has a spring holder and a stopper 8, and when no electromagnetic force is acting, the plunger 6 is placed between the coil case 9 and the spring holder 7. The stopper 8 is placed in a position against the coil case 9 by the spring force of the return spring lO inserted into the coil case 9. A stem 11 is provided at one end of the plunger 6, and a connecting rod 12 is provided at the other end. It has come into contact with.

A brush 14 of a potentiometer constituting a position detector 13 is housed in the link 12 .

Also, both ends of the winding 150 that this brush 14 contacts are connected to the power source 1.
6, the brush 14 is connected to the conductor 17m,
17b, the coil 5 is connected to the power source 16, and these constitute an electric circuit 18.

When the winding 15 of the position detector 13 is longer than the full stroke of the plunger 6, the switch 19 linked to the engine key switch is closed during engine operation to close the electric circuit 18.

Volume from power supply 16 @ 15. -zkushi14. The plunger 6 is attracted to the left in FIG. 1 by the electromagnetic force caused by the drive current supplied to the coil 5 through the conductor 17m, and is placed in a position where the stopper 8 hits the coil coos 9. At this time, according to the first configuration, the drive current supplied to the coil 5 is maximum, and the electromagnetic force acting on the plunger 6, that is, the lever 3i
The resistance to C is maximum.

When the throttle valve 2 rotates in the valve closing direction, that is, clockwise in FIG. 1, and the lever 3 contacts the stem IIK Mf.

The lever 3 receives a resistance force corresponding to the force 11a, and its rotational speed decreases, and the closing speed of the throttle valve 2 decreases. Plunger 6
As it is pushed and moved to the right in Figure 1, the position detector 13
The brush 14 moves in the direction of increasing the resistance value of the winding 15 and reduces the drive current supplied to the coil 5. Therefore, the closing speed of the throttle valve 2 gradually increases.

According to the above explanation, the relationship between the plunger 60 stroke and the electromagnetic force generated by the coil 5 is as shown in Fig. 3A, but if the 2nd turn @ 15 is made shorter than the entire stroke of the plunger 6, the relationship as shown in Fig. 3B is obtained. The relationship will be like this. In addition, there is no return lO
is not necessary in the case of FIG. 3A, but is necessary when the characteristics as shown in FIG. 3B are given.

FIG. 2 shows a different embodiment of the present invention, and unlike the embodiment shown in FIG. The stem 11 is composed of a control circuit 20 and a conductor 17e that sends a driving current to the coil 5, and the output voltage of the position detector 13 moves together with the plunger 6.
This becomes a position signal and is sent to the electronic control circuit 20, which supplies the electromagnet 4 with a drive current that generates the required resistance force.

According to this configuration, the electronic control circuit 20 provides arbitrary resistance force to the other machine with various characteristics.

It is possible to control the device 9 and have the characteristics as shown in FIG. 3C, for example.

Note that the first position detector 13 can be configured with a differential transformer, a variable capacitor, a variable inductance, etc.

(Effects of the Invention) According to the present invention, the resistance given to the operation of the other device is obtained by the ta force instead of the fluid throttling effect, and the electromagnetic force can be changed depending on the position, so that the operation is improved. Not only is it possible to accurately control the target device by stably exhibiting the required performance without variations in start timing and operating characteristics, but it also allows control of any characteristics by setting the control characteristics according to the VH drive current. be. 7

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing an embodiment of the invention, and FIG. 2 is a layout diagram showing a different embodiment of the invention. 3A, B, and C show the relationship between the stroke of the plunger of the electromagnet and the electromagnetic force, and FIGS. 4 and 5 are schematic cross-sectional views of the conventional example. 4... Electromagnet, 5... Coil, 6...
... Plunger, 11 ... Stem, 13.
...Position detector. 18... Electric circuit.ゝ、・）

Claims (1)

[Claims] The electromagnet includes an electromagnet in which a plunger is provided with a stem that receives the force of a partner device, a position detector for the stem, and an electric circuit that supplies a driving current to a coil of the electromagnet according to the position of the stem. A darts pot characterized by being configured so that the force acts as resistance to the operation of a mating device.