JPH058154U - Solenoid valve - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In a solenoid valve that opens and closes the flow of oil through an oil passage, improves responsiveness to pressure changes due to sudden changes in load operation, etc., and makes the valve smaller and more economical. With the goal. [Structure] A check valve 4 connected to a main oil passage 3a is formed in a part of a seat valve 3 which is press-fitted into a space of a fixed iron core 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

    The present invention is a solenoid valve for hydraulic control of ships, vehicles, etc., especially high pressure, high response and     And the structure of the solenoid valve that requires high stroke accuracy.     is there.

[0002]

[Prior art and its problems]

    This type of hydraulic control solenoid valve is used for moving cores and fixed cores that have oil passages.     Are opposed to each other, and the sheet valve is press-fitted into the fixed iron core or the like, and the tip of the sheet valve is     It is configured such that the end portion faces the oil passage. And it is possible by exciting the coil     By moving the moving iron core to the fixed iron core side, the oil passage is closed and the excitation is released.     The return spring acts to open the oil passage and return the oil in the valve.     Open and close the flow.

[0003]                                                                   (2)     For example, one of the solenoid valves (right or     On the left side), connect the brake petal part through the oil pipe, and connect the pipe to the other side.     Each load device such as a vehicle brake is connected via a hydraulic brake control operation.     . In this case, abrupt pressure changes of the left and right load devices, such as sudden break operation     As a result, negative pressure is generated inside the valve, and the hydraulic response such as oil flow deteriorates. this     As a means for solving the problems, conventionally, a check valve (one-way only) independent of the seat valve is used.     To form an oil passage. ) Is provided to bypass the oil flow in the main oil passage and respond to hydraulic pressure.     It is being done to improve sex. However, this structure causes a great change in the valve.     Not only, but also as a unit by separating the solenoid valve and check valve     It has the drawback of requiring man-hours and being expensive.

[0004]

[The purpose of the device]

    The present invention solves the above-mentioned drawbacks, and is a compact solenoid valve with good hydraulic response.     Intended to provide

[0005]

[Means of the Invention for Solving Problems]

    The present invention provides a second oil passage with a check valve in the sheet valve itself which is press-fitted into the fixed iron core.     It is provided to reduce the size of the valve.

[0006]

[Configuration of Example]

    FIG. 1 is a structural diagram of an embodiment of the present invention, in which 1 is a fixed core having an internal hollow 1a, and 2 is     A movable iron core 2b having a hole 2a for an oil passage is a ball fixed to the tip of the hole 2a.     The sheet-like member 3 is a sheet valve press-fitted into the hollow portion of the fixed iron core 1 and is located at the tip of the oil passage hole 3a.     The end is arranged so as to face the spherical body 2b. 4 is the main part of the present invention     Is a check valve formed in parallel with the oil passage hole 3a of the seat valve 3 and is an oil passage hole in the axial direction.     4a is provided, and a spherical body 4c supported by a spring 4b is provided in the middle of the hole 4a.     Has been inserted. 4d is a spring guide, 4e is a stopper, and the hole 4a     The rear end is diametrically connected to the oil passage 3a of the seat valve 3. Then 5 returns                                                                   (3)     Springs, 6 and 7 are oil filters, 8 is a non-magnetic filler ring, and 9 is possible     It is a stopper for movable positioning of the moving iron core 2 and has an internal hollow oil passage 9a formed therein.     There is. 10 is an end cap, 11 is a starter ring, 12 is a bobbin, 13     Is an exciting coil, 13a is a lead wire for the lead, 14 is a frame, and 15 is a resin.     Parts, P, P'indicate pressure directions from the load side.

[0007]     The operation of this valve is such that when the coil 13 is de-excited (state of FIG. 1), the movable iron     The core 2 is pressed by the return spring 5 and the tip of the sheet valve 3 (valve sheet) is pressed.     Part) is opened, and the oil passes through the oil passages 2a, 3a and the hollow portion 1a of the fixed iron core, respectively.     Return to each other. On the other hand, when the coil 13 is excited, the fixed iron core 1, the movable iron core 2,     Of the magnetic circuit passing through the end cap 10, the frame 14, and the stator ring 11.     Due to the formation, the movable iron core 2 resists the spring force of the return spring 5 and moves toward the fixed iron core side.     It is sucked and moves in the direction of the arrow, and the spherical body 2b moves the oil passage 3a of the sheet valve.     Close. (S in the figure indicates a movement stroke.) The above operation is repeated.

[0008]     Next, the operation of the check valve will be described. Spherical body built in the check valve 4     4C is constantly pressed by the spring 4b to close the oil passage. Obey     The oil flow from the P direction is closed. On the other hand, the pressing force of the spring 4b     Is set to a small value, the pressure of oil flow from the P'direction     When P is larger than P (P '> P), the spherical body 4C passes through the oil passage 2a and the void 1a.     When pressure is applied and the pressure exceeds the pressing force of the spring 4b, the check valve 4 is vacant     Oil flows through the paths 4a and 3a. This path is the coil 13 and return spr     It functions regardless of whether the main oil passages 3a, 2a are opened or closed by the ring 5. However, P> P '     At the time of, it is in the closed state regardless of whether the main oil passage is opened or closed.

[0009]

[Effect of device]

    According to the present invention, since the above-mentioned functions are provided, the load device operates according to the operation.     Since oil flows through the main oil passage 3a or the check valve 4, even if a negative pressure is generated,                                                                   (4)     Open the valve until the pressures in the two become almost equal (P ≒ P ') to smooth the oil flow.     It Moreover, since a check valve is formed in a part of the sheet valve, the valve is small and assembled.     It is possible to achieve small size and economy.

[Brief description of drawings]

[Figure 1] 1 fixed iron core 2 movable iron core 2a oil passage 2b spherical body 3 sheet valve 3a oil passage 4 check valves 4a void 4b spring 4c spherical body 5 Return spring

Claims (2)

(1) [Scope of utility model registration request] 1. A movable iron core having an oil passage in the axial direction and an inner hollow fixed iron core are opposed to each other, and a sheet valve is press-fitted into the hollow portion of the fixed iron core, and the oil of the sheet valve is In the solenoid valve in which the passages are arranged so that the spherical portions fixed to the oil passage tips of the movable iron core face each other, and the respective oil passages are opened and closed by the action of the coil excitation and the return spring, the axial direction of the sheet valve And a check valve that forms a second oil passage between the fixed iron core and an empty portion of the fixed iron core. 2. The solenoid valve according to claim 1, wherein the first oil passage and the second oil passage of the seed valve are connected in the diametrical direction of the seat valve.