JPH071562Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a solenoid valve used, for example, for adjusting the braking force of a brake in an antilock brake system.

(Prior Art) Generally, an antilock brake system has an electronic control unit, and the electronic control unit uses a wheel rotation speed signal from a speed sensor and a wheel acceleration signal obtained by differentiating the wheel rotation speed signal, Appropriate to detect the sign that the wheels are going to lock when controlling the vehicle and give a drive command to the modulator (hydraulic pressure adjusting device) to ensure the steering stability of the vehicle during braking and shorten the braking distance. The braking force of the brake is controlled while giving various wheel slip rates.

Further, in the anti-lock brake system, a solenoid valve device normally composed of a pair of normally-open and normally-closed valve bodies is used to open and close the valve bodies to apply brake adjustment pressure to the modulator, or Means such as adjusting the braking force of the brake by escaping the adjusting force to the reservoir side is adopted.

On the other hand, in order to efficiently incorporate such an electromagnetic valve device into a system, there is known one disclosed in, for example, Japanese Utility Model Publication No. 59-79451 or Japanese Utility Model Publication No. 59-79453. This electromagnetic valve device includes an electromagnetic valve (out valve) having a normally-open valve body arranged in an oil passage (fluid passage) between a brake fluid reservoir for antilock control and a modulator, and its closing. When the valve is in communication with the modulator, the solenoid valve (in-valve) having a normally-closed valve body that supplies the brake fluid accumulated in the accumulator to the modulator when the valve is opened is connected to the reservoir by an oil passage. The cores having through holes formed so as to be commonly formed are arranged so as to sandwich the cores, and the cores are integrally incorporated in a vertical case in a single case.

(Problems to be Solved by the Invention) However, in the above-described conventional configuration, the case is formed of a single cylindrical body, and thus the first valve body portion and the second solenoid valve that configure the first solenoid valve are configured. Since it is necessary to assemble the second valve body and the like in a narrow vertically long space, the efficiency of the assembling work is poor and there is a problem that it is not suitable for mass production.

The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a solenoid valve device that improves the efficiency of assembly work.

(Means for Solving Problems) In order to achieve the above object, a fluid passage is formed, and a through hole is formed in a first valve body portion and a second valve body portion for opening and closing the fluid passage. A first pipe and a second pipe, which are arranged in series with a core interposed therebetween, and are respectively wound around the outer peripheral portions of the both pipes and selectively drive the both valve body portions. It is provided with a pair of exciting coils, and a cylindrical cup-shaped first case and a second case which respectively cover both exciting coils and are open at both ends, and one opening end of the first case is opened to the first pipe. Clamping between the end portion and the holding portion of the first valve body portion, and holding one opening end of the second case between the opening end portion of the second pipe and the holding portion of the second valve body portion. It is characterized in that the other open ends of the both cases face each other and are joined together.

(Operation) Since the case is divided into the first case and the second case, the narrow assembly space is divided into two parts, and the valve body parts and the like are assembled into both cases on both sides. Assembling work is easy because each can be done separately.

(Embodiment) FIG. 2 shows an example of the entire configuration of a hydraulic system of an anti-lock brake system to which the solenoid valve according to the present invention is applied, and a tandem type master cylinder 2 depending on the depression of the brake pedal 1. Brake pressure is applied to the primary braking hydraulic chambers 41, 41 'in the first modulator 4, respectively, and further, the primary braking hydraulic chambers 51, 51' in the second modulator 5 are applied through the first modulator 4.
Also, the brake pressure is applied via the hydraulic control valves 61 and 61 ', respectively. Also, modulator 4
When the brake pressure is applied to the primary braking hydraulic chambers 41 and 41 ', the pistons 42 and 42' move forward to transmit the braking pressure to the secondary braking hydraulic chambers 43 and 43 ', respectively. According to the hydraulic pressure outputs of the braking hydraulic chambers 43 and 43 ', the front wheel brakes 71 on the right and left sides of the vehicle,
71 'are activated respectively. The same applies to the modulator 5 side as well, with each piston 52, 5
The secondary braking hydraulic chamber 5
Brake pressure is transmitted to 3, 53 ', and their respective hydraulic outputs cause rear wheel brakes 81, 8 on the left and right sides of the vehicle.
1'is activated respectively. Also, the pistons 42, 42 'and 52, 52' in the modulators 4, 5 are
Open rear oil chambers 44, 44 'and 54, 54' are connected to the respective rear portions of the cup-shaped seals for partitioning the open oil chambers 54, 54 'on the modulator 5 side and the secondary braking hydraulic chambers 43, 43', respectively. The members 45, 45 'and 55, 55' are integrally attached to the cylinders 42, 42 'side, and the open oil chambers 44, 44' and 54, 5 are provided.
Oil is supplied from the 4'to the secondary braking hydraulic chambers 43, 43 'and 53, 53', respectively, but the oil is prevented from leaking in the opposite direction.

In addition, after the control oil supplied from the anti-lock control reservoir 10 is pressurized to a predetermined pressure by the pump 11, the accumulator 12 temporarily accumulates the pressure, and the accumulated control oil is controlled by an electromagnetic valve having a normally closed valve body. Antilock control chambers 46 of modulators 4 and 5 through valves (in-valves) 100 and 101,
On the other hand, each anti-lock control chamber 46, 56 is supplied to 56, and each anti-lock control chamber 46, 56 has a solenoid valve (out valve) 10 having a normally open type valve body.
It is connected to the reservoir 10 via 2, 103.

The in-valve 100, 101 and the out-valve 102, 1
03 is opened and closed according to a drive command from an electronic control unit (not shown). During antilock control, the in-valves 100 and 101 are in the open state and the out-valve is out.
102 and 103 are closed, and when not controlled, the in valves 100 and 101 are closed and the out valves 102 and 103 are closed.
Returns so that the valve opens.

In the anti-lock brake system configured as described above, the temporary braking hydraulic chamber 4 of the modulators 4 and 5 is
Brake pressure is applied to 1, 41 'and 51, 51', respectively, and the wheel brakes 71, 71 'and 81, 81' are driven by the hydraulic output from the secondary braking hydraulic chambers 43, 43 'and 53, 53'. At the time of operation, when an antilock drive command is output from the electronic control unit, the outvalve 102 that has been open until then so that the antilock control oil chambers 46, 56 and the reservoir 10 are in communication with each other, 103 is closed, and instead the in-valves 100 and 101 are open, and the control oil pressurized in the anti-lock control chambers 46 and 56 (pressurized to be higher than the brake pressure) Will be sent appropriately,
As a result, the pistons 42, 42 'and 52, 52' are respectively pushed back and the brake pressure is weakened.

FIG. 1 shows an embodiment of a pair of an in-valve 100 and an out-valve 102, or an in-valve 101 and an out-valve 103 (hereinafter, the in-valve 100 and the out-valve 102 will be described as an example) constituting an electromagnetic valve device according to the present invention. As shown, the pair of cylindrical cup-shaped cases 200, 201 (see FIG. 3) are arranged symmetrically with respect to the line XX. Case 20
A small opening 200a is provided at one end portion (one opening end of the first case) 200c of 0, and the other end portion (the other opening end of the first case) 200b is opened larger than the small opening 200a. ing. Similarly, a small opening 201a is provided at one end of the case 201 (one opening end of the second case) 201c, and a small opening 201a is provided at the other end (the other opening end of the second case) 201b.
It is larger than 1a. The other end 2 of the case 201
01b is butted and joined to the other end 200b of the case 200. In the cases 200 and 201, a pair of pipes 203 and 204 are vertically arranged with a center core 202 sandwiched therebetween to form a straight cylinder-shaped oil passage for brake oil.

Plunger 205 which constitutes the first valve body portion and plunger 206 which constitutes the second valve body portion are arranged in both pipes 203 and 204 respectively, and a spring is provided between both plungers 205 and 206 and the center core 202. While 207 and 208 are respectively interposed, both plungers 205 and 206 are sliding holes 209a and 210a formed in an inlet port portion 209 and an outlet port portion 210 which are fitted in the central portions of the cases 200 and 201, respectively. It is slidable inside. Here, both the plungers 205 and 206 face the center core 202 with the gaps C ₁ and C ₂ , while the push rod 21 that presses the ball valve elements 211 and 212 toward the lower end side at the center thereof.
3, 214 are fitted, one ball valve body 211 is engaged with the valve seat portion 215 fitted in the inlet port portion 209, and the other ball valve body 212 is fitted in the center core 202. It is adapted to engage with 216. An annular yoke 232 for forming a magnetic path is arranged on the outer peripheral portion of the center core 202.

On the other hand, coil bobbins 218 and 219 are provided on the outer circumferences of the pipes 203 and 204.
The coil bobbins 218 and 219 are wound with exciting coils 220 and 221 respectively, and the lead wires of the exciting coils 220 and 221 are drawn.
220a and 221a (refer to FIG. 3 for the lead wires 220b and 221b of non-conducting potential) are supported by a coupler 222 made of a mold resin and drawn to be connected to an external electronic control unit.
Then, the ball valve body 211 has the valve seat portion by the spring 207.
While being pressed against 215, the in-valve 100 becomes a normally-closed type solenoid valve, while the ball valve element 212 is caused by the spring 208 to the valve seat portion 216.
When pushed out, the out valve 102 becomes a normally open solenoid valve. The in-valve 100 and the out-valve 102 can be selectively opened or closed depending on the energization state of the exciting coils 220 and 221.

The inlet port portion 209 is a mounting hole 22 formed in the base 223.
It is attached to 3a via oil seal rings 225 and 226,
The outlet port 210 is attached to an attachment hole 224a formed in the cover 224 via an oil seal ring 227. In addition,
The base 223 and the cover 224 are connected via a stud bolt 231.

Here, the mounting hole 223a is the communication oil passage 2 formed in the base 223.
While communicating with the accumulator 12 via 23b and communicating with the brake 71 via a communication oil passage 223c, the outlet port portion 210 is connected to the reservoir 10. The inlet port 209 has a mounting hole 223.
A port 209b that communicates a with the sliding hole 209a is formed, and a port 210b that communicates the sliding hole 210a and the mounting hole 224a is formed in the outlet port portion 210.

Plunger 205 (same for plunger 206)
Two sets of rolling balls 217c are provided in the upper and lower positions on the outer peripheral portion of the set in order to make the slide between the plunger 205 and the inner wall of the sliding hole 209a. Then, the brake oil is allowed to flow through the gap formed between these rolling balls 217c and the inner wall of the sliding hole 209a.

Further, a communication hole (not shown) is formed inside the valve seat portion 216 (the same applies to the valve seat portion 215), and the communication hole communicates with a through hole 202a formed in the central portion of the center core 202, and In the case of the out valve 102 in the valve state, the through hole 202a
The brake fluid that has passed through the valve seat portion 216
Goes upward through a pair of relief holes (not shown) formed so as to penetrate in the upper end of the radial direction. The valve seat
Since a shoulder step 216c is formed at the upper end of 216,
The valve seat portion 216 does not come out in the pressurizing direction of the brake fluid.

The lower end of the valve seat portion 215, the lower end of the center core 202, the port
Filters 228, 229, and 230 are provided on the upper end of 210b, respectively.

The solenoid valve device configured as described above is assembled in the following order, for example.

First, a coil bobbin in which exciting coils 220 and 221 are wound, respectively.
218 and 219 are connected in series and are integrated with the coupler 222 by a mold resin. Next, the pipes 203 and 204 are fitted to both ends of the center core 202, and the pipes are inserted into the cylindrical coil bobbins 218 and 219. Subsequently, the through hole of the center core 202 is used to assemble the out valve 102 side. The valve seat portion 216 is fitted to 202a, and the case 201 is put on the outside of the exciting coil 221. Then the valve seat
Attach the ball valve element 212 to the tip of 216, and push the rod 21
4 is fitted and the plunger 206 on which two upper and lower rolling balls 217c are mounted is inserted into the sliding hole 210a of the outlet port 210.
And insert the spring 208 between the center core 202 and the plunger 206 so that the outlet port 210 is attached to the case 20.
It is fitted into the pipe 204 through one small opening 201a. Then, the end 201c on the side of the small opening 201a of the case 201 is held between the outlet port 210 and the end of the pipe 204 on the opening side.

Then, in order to assemble the in-valve 100 side, a spring seat 233 is interposed outside the exciting coil 220 to cover the case 200, and the ball valve body 14 is attached to the valve seat portion 215 fitted to the inlet port portion 209. Wear it. Then, the plunger in which the push rod 213 is fitted and the rolling ball 217c is mounted
205 is inserted into the sliding hole 209a of the inlet port 209, the spring 207 is interposed between the center core 202 and the plunger 205, and the inlet port 209 is inserted into the pipe 203 through the small opening 200a of the case 200. Insert it. And the inlet port section 2
A small opening of the case 200 between 09 and the opening side end of the pipe 203
The end 200c on the side of 200a is clamped. Next, the other ends 200b, 201b of the cases 200, 201 are butt-fitted and joined together.

The solenoid valve configured as described above includes the excitation coils 220 and 221.
When both are in the non-energized state (when the anti-lock is not controlled), the in-valve 100 is closed and the out-valve 102 is opened by the action of the springs 207 and 208.
Anti-lock control chamber 46 for reservoir 10 and modulator 4,
56 communicates with.

In this case, high-pressure oil from the communication oil passage 223b connected to the accumulator 12 is constantly applied to the inlet port portion 209 on the in-valve 100 side, and this pressure is applied to the inlet port portion arranged in a straight tube shape.
The compression load of 209, the center core 202, and the outlet port 210 is received.

When the in-valve 100 is open and the out-valve 102 is closed, the center core 202 supported by the pipe 204 on the out-valve side receives the high-pressure oil flowing into the in-valve 100. The stress-like influence on the exciting coils 220 and 221 arranged on the outer periphery of is eliminated.

When the exciting coils 220 and 221 are both energized (during antilock control), the plungers 205 and 206 move toward each other against the biasing forces of the springs 207 and 208, respectively, and the in-valve 100 is in the open state, The out valve 102 is closed, the communication between the reservoir 10 and the modulator 4 is cut off, and instead, the high pressure oil from the accumulator 12 which is pressurized more than before is supplied to the antilock control chamber 45.

(Effect of the Invention) As described above, according to the present invention, a core having a fluid passage formed therein and a through hole formed in the first valve body portion and the second valve body portion for opening and closing the fluid passage. A first pipe and a second pipe, which are arranged in series with each other interposed therebetween, and a pair of pipes which are respectively wound around the outer peripheral portions of the pipes and selectively drive the valve body portions. Exciting coil and first cylindrical cup-shaped first end that covers both exciting coils and has both ends open
A case and a second case are provided, and one opening end of the first case is sandwiched between the opening end of the first pipe and the holding portion of the first valve body section, and one of the second case is provided. Since the open end is sandwiched between the open end of the second pipe and the holding portion of the second valve body, and the other open ends of the two cases are faced to each other and joined, the case sandwiches the core. Since the structure is divided into two and the narrow mounting space is divided into two, it is easy to assemble the in-valve having the first valve body portion and the out-valve having the second valve body portion, which is suitable for automatic assembly.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of a solenoid valve according to the present invention, and FIG. 2 is a block diagram showing an example of a hydraulic system of an antilock brake system to which the solenoid valve shown in FIG. 1 is applied. FIG. 3 is a side view showing the external appearance of the solenoid valve device shown in FIG. 200,201 …… Case, 200a, 201a …… Small opening, 200b ……
The other end (the other open end of the first case), 201b ... The other end (the other open end of the second case), 200c ... One end (the one open end of the first case) , 201c ... one end (one opening end of the second case), 202 ... center core (core), 202a ... through hole, 203, 204 ... pipe, 20
5, 206 ... Plunger (valve body), 209 ... Inlet port (holding part), 210 ... Outlet port (holding part), 220,
221 …… Excitation coil.

Claims (1)

[Scope of utility model registration request] 1. A first valve body portion and a second valve body portion for forming a fluid passage and for opening and closing the fluid passage are arranged with a core having a through hole interposed therebetween. A first pipe and a second pipe which are arranged in series, a pair of exciting coils which are respectively wound around outer peripheral portions of the both pipes, and selectively drive the both valve body parts, and the two exciting coils, respectively. A cylindrical cup-shaped first case and a second case, both ends of which are open, are provided, and one opening end of the first case is formed between the opening end of the first pipe and the holding portion of the first valve body. Sandwiched between
One opening end of the second case is sandwiched between the opening end of the second pipe and the holding portion of the second valve body, and the other opening ends of the two cases are joined to face each other. Solenoid valve characterized by.