JP6578251B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve that controls the pressure of a working fluid in accordance with a current supplied to a coil.

  The solenoid valve has a normally open type solenoid valve (normally open type solenoid valve) that connects the input port and the output port in a state in which the current to the coil is cut off, and an input in a state in which the current to the coil is cut off. There is a normally closed solenoid valve (normally closed solenoid valve) that shuts off a port and an output port (Patent Document 1).

Patent Document 1 relates to a normally open type solenoid valve. “In FIG. 4, a normally open type solenoid valve V _OFL is fixed to a housing 31 _O having a cylindrical guide cylinder 30 and one end side in the guide cylinder 30. fixed core 32 _O, the fixed core 32 movable core 33 which faces the _O is housed in the guide tube 30, spring 34 is under compression between the stationary core 32 _O and the movable core 33 that, anti the spring force of the spring 34 Then, the solenoid valve component unit having the coil 35 surrounding the guide cylinder 30 and the cylindrical magnetic path forming member 37 surrounding the coil 35 so as to exert a magnetic attractive force for attracting the movable core 33 to the fixed core 32 _O side. 36 _O, and a magnetic metal presser plate 22 and a housing 31 _O, which are common to the solenoid valves V _OFL , V _ORR , V _OFR , V _ORL , V _CFL , V _CRR , V _CFR , V _CRL. 37, magnetically coupled and pressed through 22 is described as. ", As fastened to the base 21 by a bolt 24 in a plurality of, for example, eight (see paragraph [0015]).

Further, Patent Document 1 discloses a normally closed solenoid valve “in FIG. 5, a normally closed solenoid valve V _CFR includes a housing 31 _C having a guide cylinder 30 and a fixed core fixed to one end side of the guide cylinder 30. 32 _C , a movable core 33 accommodated in the guide cylinder 30 facing the fixed core 32 _C , a spring 34 contracted between the fixed core 32 _C and the movable core 33, and movable against the spring force of the spring 34 coil 35 surrounding the guide tube 30 so as to exert a suction force for sucking the core 33 to the fixed core 32 _C side, and an electromagnetic valve arrangement unit 36 _C having a cylindrical magnetic path forming member 37 surrounding the coil 35 The housing 31 _C and the pressing plate 22 are magnetically coupled via the magnetic path forming member 37 (see paragraph [0024]).

JP-A-8-152076

  The normally open solenoid valve or the normally closed solenoid valve described in Patent Document 1 is configured such that, for example, when the power supply from the external power supply is stopped due to a power failure and the coil is stopped energizing, the movable core is initially set by the biasing force of the spring. By returning to the position (open position or closed position), the engine can be automatically started or stopped.

  However, in the normally open solenoid valve or the normally closed solenoid valve described in Patent Document 1, when the power supply from the external power supply is intentionally stopped (for example, during engine maintenance), the movable core is in the initial position ( The engine may be started or stopped unintentionally.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a normally open type electromagnetic valve capable of maintaining a valve closed state even when power to the coil is interrupted. is there.

The inventions for solving the above problems, a case where the output port connected to the flow path of the input port and the low-pressure side connected to the flow path of the high pressure side is formed, in said case, said input port And a movable core provided to be movable between a closing position for closing an internal flow path connecting the output port and an open position for opening the internal flow path, and provided in the case, A coil for applying a magnetic force in a direction from the open position to the closed position with respect to the movable core, and an attachment hole for attaching a stopper for holding the movable core in the closed position are formed in the case, It is assumed that the open position is located vertically below the closed position .

According to the present invention, in a normally open type electromagnetic valve, it is possible to maintain a closed state even when the power supply to the coil is interrupted .

It is sectional drawing which shows the excitation state (valve closed state) of the solenoid valve which concerns on 1st Example of this invention. It is sectional drawing which shows the non-excitation state (valve open state) of the solenoid valve which concerns on 1st Example of this invention. It is sectional drawing which shows the stopper attachment state of the solenoid valve which concerns on 1st Example of this invention. It is AA sectional drawing of FIG. It is sectional drawing which shows the excitation state (valve-opening state) of the solenoid valve concerning 2nd Example of this invention. It is sectional drawing which shows the non-excitation state (valve closing state) of the solenoid valve which concerns on 2nd Example of this invention. It is sectional drawing which shows the stopper attachment state of the solenoid valve which concerns on 2nd Example of this invention. It is sectional drawing which shows the excitation state (valve open state) of the solenoid valve which concerns on 3rd Example of this invention. It is sectional drawing which shows the non-excitation state (valve closing state) of the solenoid valve which concerns on 3rd Example of this invention. It is sectional drawing which shows the stopper attachment state of the solenoid valve which concerns on the 3rd Example of this invention. It is sectional drawing which shows the excitation state (valve closed state) of the solenoid valve which concerns on the 4th Example of this invention. It is sectional drawing which shows the non-excitation state (valve open state) of the solenoid valve which concerns on 4th Example of this invention. It is sectional drawing which shows the stopper attachment state of the solenoid valve which concerns on the 4th Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted suitably.

  A solenoid valve according to a first embodiment of the present invention will be described with reference to FIGS. The electromagnetic valve 1 according to the present embodiment is a normally open type electromagnetic valve that opens in a state where power to the coil 4 is interrupted. FIG. 1 is a cross-sectional view showing an excited state (valve closed state) of the solenoid valve 1, and FIG. 2 is a cross-sectional view showing a non-excited state (opened state) of the solenoid valve 1.

  As shown in FIG. 1, the solenoid valve 1 is formed with an input port 2a connected to a high-pressure channel (not shown) and an output port 2b connected to a low-pressure channel (not shown). In the case 2, the lower position in the figure for closing the internal flow path 7 connecting the input port 2a and the output port 2b (hereinafter referred to as "closed position") and the internal flow path 7 in the case 2 are opened. A movable core 3 provided to be movable between an upper position (hereinafter referred to as an “open position”) and a case 2 provided in the case 2 in a direction from the open position to the closed position with respect to the movable core 3 when energized. A coil 4 for applying a magnetic force and a tension spring 5a provided in the case 2 and for applying a tensile force in a direction from the closed position toward the open position on the movable core 3 are provided.

  When the coil 4 is energized, the movable core 3 is moved to the vertically closed position by the action of magnetic force, as shown in FIG. On the other hand, when the energization to the coil 4 is interrupted, as shown in FIG. 2, the coil 4 is moved to the open position vertically above by the action of the tensile force by the tension spring 5 a, and the internal flow path 7 is opened.

  On the open position side of the case 2, a screw hole 2c is formed as an attachment hole for attaching a stopper 6 described later. The screw hole 2c is closed by a closing member 2d except when the stopper 6 is attached.

  FIG. 3 is a cross-sectional view illustrating a state where the stopper of the electromagnetic valve 1 is attached, and FIG. 4 is a cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 3 and 4, the screw hole 2c formed on the open position side of the case 2 is provided with a stopper 6 that holds the movable core 3 in the closed position against the tensile force of the tension spring 5a. Can do. As a result, the movable core 3 can be held in the closed position even when the coil 4 is de-energized (non-excited state).

  According to the present embodiment, by attaching the stopper 6 to the screw hole 2c formed in the case 2, the normally open electromagnetic valve 1 can be held open even in a non-excited state. This makes it possible to prevent the engine from starting unintentionally when the power supply from the external power supply is intentionally stopped (for example, during engine maintenance).

  A solenoid valve according to a second embodiment of the present invention will be described with reference to FIGS. The electromagnetic valve 1 </ b> A according to the present embodiment is a normally closed electromagnetic valve that closes in a state where power to the coil 4 is interrupted. FIG. 5 is a cross-sectional view showing an excited state (opened state) of the electromagnetic valve 1A, FIG. 6 is a cross-sectional view showing a non-excited state (closed state) of the electromagnetic valve 1A, and FIG. It is sectional drawing which shows the stopper attachment state of valve 1A. Hereinafter, the difference from the electromagnetic valve 1 (shown in FIGS. 1 to 4) according to the first embodiment will be mainly described.

  The coil 4 in the present embodiment is configured to apply a magnetic force in the direction from the closed position to the open position (upward in the drawing) on the movable core 3 when energized. The electromagnetic valve 1 </ b> A includes a compression spring 5 b that applies a compressive force in a direction from the open position to the close position on the movable core 3. When the coil 4 is energized, as shown in FIG. 5, the movable core 3 is moved from the closed position to the open position by the action of magnetic force, and the internal flow path 7 is opened. On the other hand, when the energization to the coil 4 is interrupted, the movable core 3 is moved from the open position to the closed position by the action of the compression force by the compression spring 5b as shown in FIG. .

  As shown in FIGS. 5 to 7, the screw hole 2 c in this embodiment is formed on the closed position side of the case 2. A stopper 6 that holds the movable core 3 in an open position against the compression force of the compression spring 5b can be attached to the screw hole 2c. As a result, the movable core 3 can be held in the open position even when the coil 4 is de-energized (non-excited state).

  According to the present embodiment, by attaching the stopper 6 to the screw hole 2c formed in the case 2, the normally closed electromagnetic valve 1A can be kept open even in a non-excited state. As a result, when the power supply from the external power supply is intentionally stopped (for example, during maintenance of the engine), it is possible to prevent the engine from being stopped unintentionally.

  A solenoid valve according to a third embodiment of the present invention will be described with reference to FIGS. The electromagnetic valve 1B according to the present embodiment is a normally closed type electromagnetic valve that opens in a state where power to the coil 4 is interrupted (non-excited state). FIG. 8 is a cross-sectional view showing an excited state (opened state) of the electromagnetic valve 1B, FIG. 9 is a cross-sectional view showing a non-excited state (closed state) of the electromagnetic valve 1B, and FIG. It is sectional drawing which shows the stopper attachment state of valve 1B. Hereinafter, the description will focus on the differences from the electromagnetic valve 1A according to the second embodiment (shown in FIGS. 5 to 7).

  As shown in FIGS. 8 to 10, the electromagnetic valve 1 </ b> B according to the present embodiment is installed so that the open position of the movable core 3 is positioned vertically upward and the closed position of the movable core 3 is positioned vertically downward. Yes. When the coil 4 is energized, as shown in FIG. 8, the movable core 3 is moved from the vertically closed position to the vertically opened position by the action of magnetic force, and the internal flow path 7 is opened. On the other hand, when the energization to the coil 4 is interrupted, the movable core 3 is moved from the vertically open position to the vertically closed position by the action of gravity G as shown in FIG. Is done.

  As shown in FIG. 10, a stopper 6 that holds the movable core 3 in the vertically upward position against the gravity G can be attached to the screw hole 2 c in the present embodiment. As a result, the movable core 3 can be held in the open position even when the coil 4 is de-energized (non-excited state).

  According to this embodiment, by attaching the stopper 6 to the screw hole 2c formed in the case 2, the normally closed electromagnetic valve 1B can be kept open even in a non-excited state. As a result, when the power supply from the external power supply is intentionally stopped (for example, during maintenance of the engine), it is possible to prevent the engine from being stopped unintentionally.

  Furthermore, when the solenoid valve 1B is installed so that the closed position of the movable core 3 is located vertically below the opened position, the movable core 3 is opened by the action of gravity G when the coil 4 is de-energized. To the closed position. This eliminates the need for means (such as a compression spring) for holding the movable core 3 in the closed position in the non-excited state, thereby reducing the manufacturing cost of the electromagnetic valve 1B.

  A solenoid valve according to a fourth embodiment of the present invention will be described with reference to FIGS. The electromagnetic valve 1C according to the present embodiment is a normally open type electromagnetic valve that opens in a state where power to the coil 4 is interrupted (non-excited state). FIG. 11 is a cross-sectional view showing an excited state (closed state) of the solenoid valve 1C, FIG. 12 is a cross-sectional view showing a non-excited state (opened state) of the solenoid valve 1C, and FIG. It is sectional drawing which shows the stopper attachment state of 1 C of solenoid valves. Hereinafter, the difference from the electromagnetic valve 1 (shown in FIGS. 1 to 4) according to the first embodiment will be mainly described.

  As shown in FIGS. 11 to 13, the electromagnetic valve 1 </ b> C according to the present embodiment is installed such that the open position of the movable core 3 is positioned vertically below the closed position. When the coil 4 is energized, as shown in FIG. 11, the movable core 3 is moved from the vertically open position to the vertically closed position by the action of magnetic force, and the internal flow path 7 is blocked. On the other hand, when the energization to the coil 4 is interrupted, the movable core 3 is moved from the vertically closed position to the vertically opened position by the action of gravity G as shown in FIG. Is done.

  As shown in FIG. 13, a stopper 6 that holds the movable core 3 in the vertically closed position against the gravity G can be attached to the screw hole 2 c in the present embodiment. As a result, the movable core 3 can be held in the closed position even when the coil 4 is de-energized (non-excited state).

  According to the present embodiment, by attaching the stopper 6 to the screw hole 2c formed in the case 2, the normally open electromagnetic valve 1C can be kept closed even in a non-excited state. This makes it possible to prevent the engine from starting unintentionally when the power supply from the external power supply is intentionally stopped (for example, during engine maintenance).

  Furthermore, when the solenoid valve 1B is installed so that the open position of the movable core 3 is located vertically below the closed position, the movable core 3 is opened by the action of gravity G when the coil 4 is de-energized. To the open position. This eliminates the need for means (such as a tension spring) for holding the movable core 3 in the open position in the non-excited state, thereby reducing the manufacturing cost of the solenoid valve 1C.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. It is also possible to add a part of the configuration of another embodiment to the configuration of a certain embodiment, and delete a part of the configuration of a certain embodiment or replace it with a part of another embodiment. Is possible.

  1, 1A, 1B, 1C ... solenoid valve, 2 ... case, 2a ... input port, 2b ... output port, 2c ... screw hole (mounting hole), 2d ... closing member, 3 ... movable core, 4 ... coil, 5a ... Tensile spring, 5b ... compression spring, 6 ... stopper, 7 ... internal flow path.

Claims (1)

A case in which an input port connected to the flow path on the high pressure side and an output port connected to the flow path on the low pressure side are formed;
A movable core provided in the case so as to be movable between a closed position for closing the internal flow path connecting the input port and the output port and an open position for opening the internal flow path;
A coil that is provided in the case and applies a magnetic force in a direction from the open position to the closed position on the movable core when energized;
In the case, a mounting hole for mounting a stopper that holds the movable core in the closed position is formed ,
An electromagnetic valve characterized in that the open position is located vertically below the closed position .

Images