JPH0552460U - solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a solenoid that can easily perform fine tuning with a damping effect even if it is a single item. A plunger chamber 51d, which is formed inside a solenoid base 51 having a coil 53b wound around its outer periphery and is filled with hydraulic fluid, and a plunger chamber 51d which are slidably provided in two chambers. 52, a through hole 52b that is formed in the plunger 52 to communicate the two chambers, and a throttle member 52c that is replaceably screwed into the through hole 52b.
The throttle member 52c and the center post 55 screwed into the solenoid base to openably close one side of the plunger chamber 51d facing each other are provided.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a solenoid suitable for use as a control actuator for a pressure control valve.

[0002]

[Prior Art]

 Heretofore, as a solenoid valve for a pressure control valve, one described in Japanese Utility Model Laid-Open No. 60-73206 has been known.

In such a conventional solenoid for a pressure control valve, by forming a through hole extending from a front end portion to a rear end portion of the plunger along a sliding direction of the plunger, a plunger generated when the plunger slides is formed. It was made possible to allow the working fluid to flow through each other due to the volume change in the front chamber and the rear chamber of the chamber, thereby allowing the plunger to slide. The movement of the plunger can be damped by reducing the diameter of this through hole.

[0004]

[Problems to be solved by the device]

 However, in such a conventional control valve solenoid, the through hole has a throttling action, so the hole diameter is small and it is very difficult to machine the hole. There was a problem that the effects could not be tuned.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a solenoid that can easily perform fine tuning of the damping effect even if it is a single item.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, in a solenoid of the present invention, a plunger chamber formed inside a solenoid base having a coil wound around its outer periphery and filled with hydraulic fluid, A plunger provided so as to be slidable by defining the plunger chamber in two chambers, a through hole formed in the plunger to connect the two chambers, and a diaphragm exchangeably mounted in the through hole. The means includes a member and a closing member that opens and closes one side of the plunger chamber facing the throttle member.

[0007]

[Action]

 Since the solenoid of the present invention is configured as described above, the plunger slides due to the suction force generated by energizing the coil, and the pressing force due to this sliding drives the control valve etc. to output hydraulic pressure, etc. Can be controlled.

[0008] The sliding of the plunger causes the working fluid in the plunger chamber defined by the plunger to flow between the two compartments through the through hole formed in the plunger. Sliding is allowed.

Further, since the flow rate of the hydraulic fluid flowing between the two compartments is limited by the throttling action of the throttling member provided in the through hole, the movement of the plunger is damped according to the throttling amount. .. Thus, the movement of the plunger is damped by the throttle member, and the damping effect of this plunger changes depending on the throttle amount of the throttle member. The change of the throttle amount is made by exchanging the throttle member itself with a different throttle amount. To change the throttle member, the closing member is removed to open one side of the plunger chamber. This can be done easily.

As described above, in the solenoid of the present invention, fine tuning of the damping effect can be easily performed by exchanging the diaphragm member even if it is a single item.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. In describing this embodiment, a pressure control valve A in which the hydraulic pressures of the two output circuits S1 and S2 are controlled by the two embodiment solenoids will be taken as an example. Further, in the embodiments, the same reference numerals indicate the same objects.

First, the configuration of the pressure control valve to which the solenoid of the embodiment is applied will be described.

FIG. 1 is a sectional view showing a pressure control valve A using a first solenoid 5 and a second solenoid 6 which are solenoids for a pressure control valve according to an embodiment of the present invention. The output hydraulic pressures P ₁ and P ₂ of the first output circuit S1 and the second output circuit S2 are controlled in proportion to the current value applied to the first solenoid 5 or the second solenoid 6. Such control is used, for example, in the operation of the steering angle control device for the rear wheels of an automobile. In such a steering angle control device, for example, the output hydraulic pressure increase of the first output circuit S1 and the second output circuit S2 are performed. It is said that the rear wheels are steered to the left due to the decrease in the output hydraulic pressure of the vehicle, and conversely the rear wheels are steered to the right due to the decrease in the output hydraulic pressure of the first output circuit S 1 and the increase in the output hydraulic pressure of the second output circuit S2. Such an operation is performed.

In FIG. 1, reference numeral 1 denotes a valve body, and a valve hole 11 is bored in the valve body 1. A first output port 11a and a second output port 11b are formed in the valve hole 11, the hydraulic pressure supply circuit 2 is connected between the ports 11a and 11b, and the ports 11a and 11b are also connected. The drain circuit 3 is connected to the outer position of the. Further, large-diameter first back chambers 1a and second back chambers 1b are formed at both ends of the valve hole 11, and both back chambers 1a and 1b and the drain circuit 3 are connected to each other by a communication passage 30. It is in communication.

The first output port 11a is connected to the first output circuit S1, while the second output port 11b is connected to the second output circuit S2. The hydraulic pressure from the pump P is supplied to the hydraulic pressure supply circuit 2, while the drain circuit 3 is connected to the reservoir tank T and is at atmospheric pressure.

A valve spool 4 is slidably incorporated in the valve hole 11. The valve spool 4 has a first land 4a which is provided in the first output port 11a in an underlapped state and forms throttles q and r with the valve hole 11, and an underlap in the second output port 11b. The second lands 4b which are provided in a state and form the throttles s and t with the valve hole 11 and the end lands 4c and 4d at both ends are formed and guided from the hydraulic pressure supply circuit 2. The hydraulic pressure is switched between the first output port 11a and the second output port 11b.

That is, when the valve spool 4 slides to the right from the neutral position in the drawing, the drain side throttle r is narrowed and the hydraulic pressure supply side throttle q is widened at the first output port 11a, while At the second output port 11b, the throttle s on the hydraulic pressure supply side is narrowed and the throttle t on the drain side is widened to increase the output hydraulic pressure P ₁ . On the other hand, when the valve spool 4 is slid to the left in the figure, the throttles q and t are narrowed and the throttles r and s are widened, so that the output hydraulic pressure P ₂ of the second output port 11b is increased. Rises.

Both ends of the valve spool 4 are elastically supported by centering springs 4e and 4f, and a sliding bias is applied so that both output hydraulic pressures P ₁ and P ₂ are at the same hydraulic pressure. Has been done. Further, retainers 41a and 41b are interposed between the centering springs 4e and 4f and the valve spool 4. The retainers 41a and 41b are provided with flanges 42a and 42b which are brought into contact with the valve body 1 when the valve spool 4 is in the neutral position, and the valve spool 4 is in the neutral position or the centering spring 4e. , 4f, the elastic force is prevented from being transmitted to the valve spool 4 in the state of sliding away from the valve spool 4.

A first piston sliding hole 63 a and a second piston sliding hole 63 b, which communicate with the first output port 11 a and the second output port 11 b, are axially provided at both ends of the valve spool 4, respectively. The first pilot piston 64a and the second pilot piston 64b are slidably inserted into the piston sliding holes 63a and 63b.

The sliding of the valve spool 4 is performed by both solenoids 5 and 6. That is, both solenoids 5 and 6 are provided as control actuators that slide the valve spool 4 by a required amount, and the generated suction force is controlled by the applied current.

Next, the structure of both solenoids 5 and 6 will be described, but since both are the same structure, only the structure of the first solenoid 5 will be shown and described. The first solenoid 5 is screwed onto the outer periphery of the back chamber 1b of the valve body 1 as shown in the figure, and is fixed to the base portion 51a with a lock nut 51e, and an intermediate portion fitted to the base portion 51a. The cylinder 51b and the rear cylinder 51c fitted to the intermediate cylinder have a solenoid base 51 in which a plunger chamber 51d is formed.

A plunger 52 is housed in the plunger chamber 51d of the solenoid base 51 so as to be slidable in the left-right direction in the figure. With this plunger 52, the interior of the plunger chamber 51d is moved to the left and right along the sliding direction. It is divided into two chambers, and both chambers are filled with hydraulic fluid such as oil. The plunger 52 is formed with a through hole 52b which communicates between the two chambers, and a throttle member 52c is screwed into the through hole 52b so as to be replaceable. A rod 52a is connected to the plunger 52, and the tip of the rod 52a can press the valve spool 4 via the stopper member 7.

An annular protrusion 51g is formed on the outer peripheral surface of the solenoid base 51 on the valve body 1 side, and an annular coil in which a coil 53b is housed in a hobbin 53a is formed on the outer periphery of the solenoid base 51. The unit 53 is detachably attached. A cylindrical case 54 is detachably attached to the outer peripheral surface of the coil unit 53 with its rear end surface being locked to the annular projection 51g, and an annular shape is attached to the inner peripheral surface of the front end of the case 54. Engaging step portion 54a is formed.

An annular upper plate 5d is screwed onto the outer peripheral threaded portion 51h of the rear cylinder 51c with the outer peripheral portion thereof engaged with the engaging stepped portion 54a. The coil unit 53 and the case 54 are fixed by being screwed together between the upper plate 5d and the annular protrusion 51g.

An annular center post 55, which serves as a closing member that opens and closes the end of the plunger chamber 51d, is removably screwed into the front end opening of the rear cylinder 51c. It is fixed by a lock nut 55a screwed onto the outer circumference of the part.

Further, an air vent plug 57 is screwed into the center hole of the center post 55 so that the air in the plunger chamber 51d can be vented, and the amount of screwing is adjusted to adjust the A preset load of a spring 58 interposed between the air bleeding plug 57 and the plunger 52 can be adjusted. In the figure, 5e, 5f and 5g are seal rings, 5j and 5k are bearings, and 5m is a shim.

Next, the operation of the embodiment will be described. In describing the operation of the embodiment, the operation of the pressure control valve itself for feedback controlling the output hydraulic pressures P ₁ and P ₂ of both output circuits S1 and S2 has been described in the above-mentioned prior art. Since the contents of the knowledge are also described in the official gazette, the description thereof will be omitted and the operation peculiar to the present embodiment will be described.

For example, when the coil 53b of the first solenoid 5 is energized, the generated suction force causes the plunger 52 and the rod 52a to slide to the right in the figure, and the valve spool 4 is pushed and slid via the stopper member 7. Let

By the sliding of the plunger 52, the volumes of the left and right chambers of the plunger chamber 51d are changed, and the amount of hydraulic fluid corresponding to this volume change is mutually passed through the through hole 52b formed in the plunger 52. As a result, the plunger 52 is allowed to slide.

Further, since the flow of the working fluid between the left and right chambers is restricted by the throttling action of the throttling member 52c provided in the through hole 52b, the movement of the plunger 52 is damped according to the throttling amount. To be done.

In this way, the movement of the plunger 52 is damped by the throttle member 52c, and the damping effect of the plunger 52 changes depending on the throttle amount of the throttle member 52c. Then, the change of the diaphragm amount is made by replacing the diaphragm member 52c itself. That is, in order to replace the throttle member 52c, first, the lock by the lock nut 55a is released to loosen and remove the center post 55 from the rear cylinder 51c to open one side of the plunger chamber 51d. The throttling member 52c screwed into the through hole 52b is removed, and separately prepared throttling members 52c having different throttling cross-sectional areas are screwed into the through hole 52b for mounting. Is screwed into the rear cylinder 51c and locked with the lock nut 55a.

As described above, the solenoid 5 (6) of the present embodiment is characterized in that even if it is a single item, fine tuning of the damping effect can be easily performed by replacing the diaphragm member. ..

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range not departing from the gist of the present invention. Included in the present invention. For example, in the embodiment, the example in which the solenoid is applied to the pressure control valve for controlling the hydraulic pressure is shown, but naturally it can be applied to various other devices.

[0034]

[Effect of the device]

 As described above, in the solenoid of the present invention, the through hole which communicates the two chambers and is formed in the plunger, the throttle member which is replaceably attached to the through hole, and the throttle member. With the configuration including the closing member that opens and closes one side of the opposite plunger chamber, by removing the closing member, it is possible to easily replace with another throttle member having a different throttle amount, As a result, it is possible to easily perform fine tuning of the damping effect even with a single product.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pressure control valve using a solenoid according to an embodiment of the present invention.

[Explanation of symbols]

 51 Solenoid Base 51d Plunger Chamber 52 Plunger 52b Through Hole 52c Throttling Member 53b Coil 55 Center Post (Closing Member)

Claims (1)

[Scope of utility model registration request] 1. A plunger chamber formed inside a solenoid base having a coil wound around its outer periphery and filled with hydraulic fluid; and a plunger provided so as to slidably define the plunger chamber into two chambers. A through hole formed in the plunger to connect the two chambers to each other; a throttle member exchangeably mounted in the through hole; and a closing member that opens and closes one side of the plunger chamber facing the throttle member. A member, and a solenoid.