JP2016084921A - Solenoid valve and vehicle brake fluid pressure control device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve and a vehicle brake fluid pressure control device capable of suppressing the manufacturing cost.SOLUTION: A solenoid valve includes a valve seat member 220, a valve element member 230, a cylindrical body member 210 storing the valve seat member 220 and the valve element member 230, and an orifice member 270 having an orifice 271 for restricting a flow rate. The orifice member 270 is press-fitted in an inner side of the body member 210. In a vehicle brake fluid pressure control device, the solenoid valve is interposed in a fluid pressure passage connecting a fluid pressure source with a wheel brake, and increase or decrease of a brake fluid pressure acting on the wheel brake can be controlled by controlling the solenoid valve.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solenoid valve and a brake fluid pressure control device for a vehicle using the solenoid valve.

  In general, a device that controls the flow of fluid, such as an antilock brake device for a vehicle, is provided with a normally open solenoid valve or a normally closed solenoid valve as appropriate. Such a solenoid valve includes a valve seat, a valve body, a substantially cylindrical fixed core that holds the valve seat and the valve body, a flow rate limiting member in which an orifice for controlling a flow rate is formed, and a filter member. What is provided is known (see Patent Document 1). In this solenoid valve, the flow restricting member and the filter member are disposed inside the fixed core. The end of the fixed core is caulked so that the flow restricting member and the filter member do not come out of the fixed core.

JP 2005-282683 A

  By the way, in the electromagnetic valve as described above, the fixed core is plated for the purpose of rust prevention and the like. However, since the plating layer is usually formed on the entire surface of the fixed core, there is a possibility that the plating layer may be partially peeled when the end of the fixed core is caulked.

  For this reason, conventionally, after performing the treatment for forming the plating layer, after removing the plating layer of the portion for caulking the fixed core, the caulking is performed, but the number of processing steps increases, and the manufacturing cost increases. It was one of the reasons for the increase.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid valve and a vehicle brake hydraulic pressure control device that can reduce manufacturing costs.

  In order to solve the above problems, the present invention provides a valve seat member, a valve body member, a tubular body member that accommodates the valve seat member and the valve body member, and an orifice member having an orifice that restricts a flow rate. The orifice member is press-fitted inside the body member.

  According to such a configuration, the orifice member is held by the body member only by press-fitting the orifice member into the body member. Thereby, work man-hours can be reduced and manufacturing cost can be suppressed. Further, since the orifice member is merely press-fitted into the body member, there is no need to separately provide a holding portion for holding the orifice member in the body member, and the structure of the body member can be simplified.

  When the above-described solenoid valve further includes a filter member, the orifice member is disposed to be press-fitted inside the body member, and is disposed outside the press-fitting portion, and the filter member is disposed radially inwardly. It is desirable that the filter holding part has a smaller diameter on the side opposite to the press-fitting part than on the press-fitting part side.

  According to this, the filter member can be held more stably with a simple configuration.

  In the above-described electromagnetic valve, it is desirable that the orifice member becomes thinner as the orifice member is approached.

  According to this, an orifice of an appropriate size can be provided regardless of the thickness of the orifice member.

  In the solenoid valve described above, a coating layer may be formed on the body member at a portion where the orifice member is press-fitted.

  Even when the coating layer is formed on the body member in this way, the orifice member can be attached to the body member simply by press-fitting the body member, so that the coating layer is hardly peeled off. Thereby, since it is not necessary to peel off a coating layer before attaching an orifice member, while reducing a work process and improving productivity, manufacturing cost can be suppressed.

  Also, the vehicle brake hydraulic pressure control device of the present invention is a vehicle brake hydraulic pressure control in which an electromagnetic valve having any one of the above-described configurations is interposed in a hydraulic pressure path connecting a hydraulic pressure source and a wheel brake. An apparatus is characterized in that hydraulic pressure control is performed to control increase / decrease in brake hydraulic pressure acting on the wheel brake by controlling the electromagnetic valve.

  According to the present invention, it is possible to reduce the number of work steps and suppress the manufacturing cost. Further, the structure of the body member can be simplified.

It is sectional drawing which shows the normally open type solenoid valve which concerns on embodiment of this invention. It is an enlarged view which shows the orifice holding | maintenance part of a body member. It is an expanded sectional view which shows an orifice member. It is a lineblock diagram of vehicles provided with a brake fluid pressure control device for vehicles. It is a block diagram which shows the structure of a hydraulic unit. It is sectional drawing (a) which shows the 1st modification of an orifice member, and sectional drawing (b) which shows the 2nd modification of an orifice member.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, a normally open solenoid valve 200 as an example of a solenoid valve is a valve for switching between closing and opening of a flow path R formed in a base B of a vehicle brake fluid pressure control device 100. . The normally open solenoid valve 200 includes a body member 210, a valve seat member 220, a valve body member 230, a return spring 240, a movable core 250, a coil unit 260, an orifice member 270, and a filter member 280. It is mainly prepared for.

  The body member 210 is a substantially cylindrical member penetrating vertically (in the present specification, the upper and lower sides are based on a drawing referred to), and accommodates the valve seat member 220 and the valve body member 230 therein. The body member 210 is plated, for example, so that a coating layer 216 (see FIG. 2) made of a plating layer is formed on the entire surface.

  The body member 210 includes a main body portion 210A that holds the valve seat member 220 and the valve body member 230, and an orifice holding portion 210B that is provided below the main body portion 210A and holds the orifice member 270.

  A plurality of through holes 211 are formed in the side wall of the body member 210. The body member 210 has a flange portion 212 protruding in the radial direction above the plurality of through holes 211.

  The plurality of through holes 211 are provided at substantially the same height as the position between the valve seat member 220 and the valve body member 230, and communicate with the inside and outside of the body member 210. A ring member 290 provided with a filter 291 is fitted to the outside of the portion where the through hole 211 is disposed, and foreign matters in the working fluid passing through the through hole 211 are removed.

  The body member 210 is inserted into the mounting hole B1 of the base B, and is prevented from dropping from the base B by the ring-shaped locking member 212A engaged between the groove B2 formed in the mounting hole B1 and the flange portion 212. It is fixed. The base B has a flow path R1 connected to the lower portion of the mounting hole B1 and a flow path R2 provided at a position facing the through hole 211 of the body member 210. An O-ring S1 sandwiched between the body member 210 and the base body B is disposed between the flange portion 212 and the ring member 290. Further, the lower end portion (orifice holding portion 210B) of the body member 210 functions as a check valve that allows only the flow of hydraulic fluid from the flow path R2 side to the flow path R1 between the body member 210 and the base B. A seal member S2 is disposed.

  The valve seat member 220 is a substantially cylindrical member penetrating vertically, and is press-fitted into the body member 210 from below and fixed. On the upper surface of the valve seat member 220, a valve seat surface 221 with which the valve body member 230 abuts when the flow path R is closed is formed. A portion below the valve seat surface 221 of the normally open electromagnetic valve 200 is an inflow path 213 through which the working flow flows from the flow path R1.

  The valve body member 230 is a substantially cylindrical member that is long in the vertical direction, and is mainly composed of a spherical valve body 231 provided at the tip and a rod-shaped shaft portion 232 (retainer). The valve body 231 is inserted into a hole (reference number omitted) provided at the tip of the shaft portion 232, and the tip of the shaft portion 232 is caulked around the hole portion toward the radially inner side of the shaft portion 232. It is fixed to.

  The valve body member 230 is held by the body member 210 so as to be slidable up and down. Thereby, the valve body member 230 (valve body 231) advances and retreats so that it can contact the valve seat surface 221 of the valve seat member 220.

  The return spring 240 is provided in the body member 210 between the valve seat member 220 and the valve body member 230, and generates a biasing force that separates the valve body member 230 from the valve seat member 220. As a result, the valve body member 230 is biased upward by the biasing force of the return spring 240. Therefore, the valve body member 230 is separated from the valve seat member 220 in a normal state, and the flow of the hydraulic fluid from the flow path R1 to the flow path R2 Allowed.

  The movable core 250 is a substantially cylindrical member made of a magnetic material, and is disposed on the valve body member 230. The movable core 250 is housed in a bottomed cylindrical guide tube 214 fixed to the outer peripheral surface of the body member 210 by welding, and is supported slidably up and down with respect to the guide tube 214.

  The coil unit 260 is disposed so as to surround the body member 210 and the guide tube 214. The coil unit 260 includes a substantially cylindrical bobbin 261, a coil 262 wound around the bobbin 261, and a yoke 263 that is disposed outside the bobbin 261 and forms a magnetic path.

  When the coil unit 260 is energized and excited, a magnetic flux is formed vertically so as to pass through the movable core 250 in the coil unit 260, and the movable core 250 moves downward. Thereby, the movable core 250 pushes the valve body member 230, and this force exceeds the urging force of the return spring 240 and the urging force of the hydraulic fluid, whereby the valve body member 230 moves downward. As a result, the valve body 231 contacts the valve seat surface 221, so that the flow path R <b> 1 and the flow path R <b> 2 are closed and the flow of hydraulic fluid is blocked.

  The orifice member 270 is disposed between the flow path R1 of the base B and the inflow path 213 of the normally open solenoid valve 200, and an orifice 271 for limiting the flow rate is formed.

  The filter member 280 is a member for preventing the inflow of foreign matter into the body member 210, and is disposed on the flow path R <b> 1 side of the base B with respect to the orifice 271, and is held by the orifice member 270. The filter member 280 includes a ring portion 281 and a filter 282 stretched inside the ring portion 281.

Next, a detailed configuration of the orifice member 270 and its peripheral part will be described.
As shown in FIG. 2, the side wall of the orifice holding part 210B of the body member 210 is thinner than the side wall of the main body part 210A.

  The inner peripheral surface of the orifice holding portion 210B is formed with a guide surface 215 formed so that the diameter decreases toward the inner side of the body member 210, that is, the upper side, at the lower end.

  As shown in FIG. 1, the orifice member 270 is press-fitted inside the orifice holding portion 210 </ b> B of the body member 210. The orifice member 270 includes a press-fit portion 270A that is press-fitted inside the orifice holding portion 210B, and a filter holding portion 270B that is disposed outside the press-fit portion 270A and holds the filter member 280 radially inward. .

  As shown in FIG. 3, the orifice member 270 is formed by processing one sheet metal. For example, the orifice member 270 is formed by drawing a stainless steel plate.

  The press-fit portion 270A is formed in a bottomed cylindrical shape, and includes a bottom wall 272 and a first side wall 273 extending downward from the bottom wall 272.

  An orifice 271 is formed in the bottom wall 272. The bottom wall 272 becomes thinner step by step as the orifice 271 is approached. Specifically, the bottom wall 272 has a recess 272A formed on the lower surface facing the inside of the orifice member 270, and the orifice 271 is formed in the center of the recess 272A. By forming the recess 272A in this way, it is possible to provide the orifice 271 that can be limited to a desired flow rate even if the plate constituting the orifice member 270 is thickened in order to increase the strength of the press-fitting portion 270A. The orifice member 270 can be easily changed to a desired flow rate by changing the depth and shape of the recess 272A while keeping the shape and thickness of the orifice member 270 as they are.

  Further, the bottom wall 272 is smaller than the inner diameter D1 (see FIG. 2) of the orifice holding portion 210B of the body member 210.

  The first side wall 273 is formed so that the upper end portion extends radially outward as the distance from the bottom wall 272 increases. In other words, the press-fit portion 270A has a tapered upper end. This makes it easy to insert the press-fit portion 270A into the orifice holding portion 210B. In addition, since the orifice holding portion 210B is provided with a lead-in surface 215, the press-fitting portion 270A is more easily inserted into the orifice holding portion 210B by being guided by the lead-in surface 215.

  The outer diameter D2 of the thickest portion of the first side wall 273 is slightly larger than the inner diameter D1 of the orifice holding portion 210B of the body member 210 by the press-fitting allowance.

  The filter holding part 270B is formed in a cylindrical shape having a larger diameter than the press-fit part 270A. The filter holding portion 270 </ b> B is provided at an extended portion 274 that extends radially outward from the first side wall 273 of the press-fit portion 270 </ b> A, a second side wall 275 that extends downward from the extended portion 274, and a lower end edge of the second side wall 275. It has the collar part 276.

  The second side wall 275 has a diameter that decreases with distance from the press-fit portion 270A. That is, the filter holding portion 270B has a smaller diameter on the side opposite to the press-fit portion 270A than the press-fit portion 270A side. Accordingly, the filter member 280 disposed inside the filter holding portion 270B is gripped by the lower portion of the second side wall 275 and moved toward the extending portion 274, so that the filter member 280 is prevented from coming off from the filter holding portion 270B. It is possible.

  The flange portion 276 extends gradually outward in the radial direction as the distance from the second side wall 275 increases. Accordingly, the filter member 280 is guided by the flange portion 276, so that it can be easily inserted into the filter holding portion 270B.

  In the orifice member 270 and the body member 210 configured as described above, the orifice member 270 can be fixed to the body member 210 simply by press-fitting the orifice member 270 into the orifice holding portion 210B of the body member 210 from below. . Thereby, for example, after inserting the orifice member into the body member, the work man-hours can be reduced and the manufacturing cost can be reduced as compared with the case where the orifice member is fixed to the body member by caulking or the like. Further, since the orifice member 270 is merely press-fitted into the body member 210, it is necessary to separately provide a holding portion (for example, a claw that engages with the orifice member 270) for holding the orifice member 270 on the body member 210. In addition, the structure of the body member 210 can be simplified.

  In the present embodiment, the coating layer 216 is also provided on the portion of the body member 210 where the orifice member 270 is press-fitted, but the coating layer 216 is not peeled off only by press-fitting the orifice member 270 into the body member 210. . Therefore, it is not necessary to peel off the coating layer 216 from the portion of the body member 210 to which the orifice member 270 is attached before the orifice member 270 is attached. Thereby, work man-hours can be reduced and manufacturing cost can be suppressed.

  In this embodiment, the orifice member 270 has a filter holding portion 270B formed outside the press-fit portion 270A so that the diameter on the side opposite to the press-fit portion 270A is smaller than the press-fit portion 270A side. Therefore, the filter member 280 can be held with a simple configuration.

  Next, a vehicle brake fluid pressure control apparatus 100 that performs fluid pressure control by controlling the flow of brake fluid using the normally open solenoid valve 200 will be described.

  As shown in FIG. 4, the vehicle brake hydraulic pressure control device 100 is a device that appropriately controls the braking force applied to each wheel T of the vehicle CR. The vehicle brake hydraulic pressure control device 100 mainly includes a hydraulic unit 10 provided with a hydraulic path and various components, and a control unit 20 for appropriately controlling various components in the hydraulic unit 10.

  Each wheel T is provided with a wheel brake FL, RR, RL, FR, and each wheel brake FL, RR, RL, FR is supplied with a hydraulic pressure supplied from a master cylinder M as an example of a hydraulic pressure source. A wheel cylinder W that generates a braking force is provided. The master cylinder M and the wheel cylinder W are each connected to the hydraulic unit 10. The brake hydraulic pressure generated in the master cylinder M in response to the depression force of the brake pedal P (the driver's braking operation) is supplied to the wheel cylinder W after being controlled by the control unit 20 and the hydraulic pressure unit 10. .

  A pressure sensor 91 that detects the hydraulic pressure in the master cylinder M and a wheel speed sensor 92 that detects the wheel speed of each wheel T are connected to the control unit 20. The control unit 20 includes, for example, a CPU, a RAM, a ROM, and an input / output circuit. Based on inputs from the pressure sensor 91 and the wheel speed sensor 92, and various programs and data stored in the ROM, By performing arithmetic processing, a later-described inlet valve 1 and outlet valve 2 provided in the hydraulic unit 10 are controlled to increase or decrease the brake hydraulic pressure acting on the wheel brakes FL, RR, RL, FR. Execute pressure control.

  As shown in FIG. 5, the hydraulic unit 10 is disposed between the master cylinder M and the wheel brakes FL, RR, RL, FR. The two output ports M1, M2 of the master cylinder M are connected to the inlet port 10A of the hydraulic unit 10, and the outlet port 10B is connected to each wheel brake FL, RR, RL, FR. In a normal state, the hydraulic pressure path in which the inlet port 10A to the outlet port 10B in the hydraulic pressure unit 10 communicates with each other allows the pedaling force of the brake pedal P to be transmitted to the wheel brakes FL, RR, RL, FR. It has come to be.

  The hydraulic pressure unit 10 is provided with four inlet valves 1, four outlet valves 2, and four check valves 1a corresponding to the wheel brakes FL, RR, RL, FR. Further, two reservoirs 3, two pumps 4, and two orifices 5a are provided corresponding to the respective output hydraulic pressure paths 81, 82 corresponding to the output ports M1, M2, and are electrically driven for driving the two pumps 4. A motor 6 is provided.

The inlet valve 1 is a normally open proportional solenoid valve interposed in a hydraulic pressure path from the master cylinder M to each wheel brake FL, RR, RL, FR (upstream side of each wheel brake FL, RR, RL, FR). It is comprised by the normally open type solenoid valve 200 mentioned above. The inlet valve 1 (normally open solenoid valve 200) is normally open, thereby allowing the brake hydraulic pressure to be transmitted from the master cylinder M to the wheel brakes FL, RR, RL, FR. Further, the inlet valve 1 is blocked by the control unit 20 when the wheel T is about to be locked, thereby blocking the hydraulic pressure transmitted from the brake pedal P to each wheel brake FL, RR, RL, FR.
Further, the valve body 231 of the inlet valve 1 (normally open type electromagnetic valve 200) is biased toward the master cylinder M side (the valve seat member 220 side) by an electromagnetic force corresponding to the applied current, and the wheel is driven by this biasing force. The hydraulic pressures of the brakes FL, RR, RL, FR can be adjusted (see FIG. 1).

  The outlet valve 2 is located between each wheel brake FL, RR, RL, FR and each reservoir 3 (on the hydraulic pressure path leading from the hydraulic pressure path on the wheel cylinder W side of the inlet valve 1 to the reservoir 3, the pump 4 and the master cylinder M). ) Is a normally closed solenoid valve. Although the outlet valve 2 is normally closed, the hydraulic pressure applied to each wheel brake FL, RR, RL, FR is supplied to each reservoir by being opened by the control unit 20 when the wheel T is likely to be locked. Escape to 3.

  The check valve 1a is connected in parallel to each inlet valve 1 and is configured by the above-described seal member S2 (see FIG. 1). This check valve 1a is a valve that allows only the flow of brake fluid from each wheel brake FL, RR, RL, FR side to the master cylinder M side, and an inlet valve when the input from the brake pedal P is released. Even when 1 is closed, the flow of brake fluid from each wheel brake FL, RR, RL, FR side to the master cylinder M side is allowed.

The reservoir 3 has a function of absorbing brake fluid that is released when each outlet valve 2 is opened.
The pump 4 has a function of sucking the brake fluid absorbed in the reservoir 3 and returning the brake fluid to the master cylinder M through the orifice 5a. As a result, the pressure state of each of the output hydraulic pressure paths 81 and 82 reduced by the absorption of the brake hydraulic pressure by the reservoir 3 is recovered.

  The opening and closing states of the inlet valve 1 and the outlet valve 2 are controlled by the control unit 20 so that the hydraulic pressure in the wheel cylinder W of each wheel brake FL, RR, RL, FR (hereinafter also referred to as “caliper pressure”). To control. For example, in a normal state in which the inlet valve 1 is open and the outlet valve 2 is closed, if the brake pedal P is depressed, the hydraulic pressure from the master cylinder M is transmitted to the wheel cylinder W as it is to increase the pressure. When the valve 1 is closed and the outlet valve 2 is opened, the brake fluid flows out from the wheel cylinder W to the reservoir 3 side so that the pressure is reduced. When both the inlet valve 1 and the outlet valve 2 are closed, the caliper pressure is maintained. Will be held. In addition, when the hydraulic pressure of the master cylinder M is rising, if an appropriate current that does not reach the full closing state is supplied to the inlet valve 1 with the outlet valve 2 closed, the master cylinder M is set according to the current. Inflow of brake fluid into the wheel cylinder W is restricted, and the hydraulic pressure in the wheel cylinder W can be gradually increased.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified and implemented.

  In the above-described embodiment, the bottom wall 272 of the orifice member 270 is gradually thinned toward the orifice 271. However, the configuration of the orifice member is not limited to this. For example, as shown in FIG. 6A, the bottom wall 272 of the orifice member 270 may gradually become thinner as the orifice 271 is approached.

  In the above embodiment, the concave portion 272A is formed on the bottom surface of the bottom wall 272 facing the inside of the orifice member 270, and the orifice 271 is formed at the center of the concave portion 272A. It is not limited to. For example, as shown in FIG. 6B, the orifice member 270 has a recess 272B on the top surface of the bottom wall 272 facing the outside of the orifice member 270, and the orifice 271 is formed at the center of the recess 272B. Also good.

  In the embodiment described above, only the press-fitting portion 270A of the orifice member 270 is press-fitted inside the body member 210. However, for example, the whole orifice member may be press-fitted inside the body member 210.

  The configurations of the valve seat member 220 and the valve body member 230 shown in the embodiment are merely examples, and the present invention is not limited to the configuration of the embodiment. For example, in the said embodiment, although the valve body member 230 was comprised from several components (the valve body 231 and the axial part 232), it is not limited to this, For example, the valve body member is comprised from 1 component. Alternatively, the shaft portion 52 of the embodiment may be composed of a plurality of parts.

  In the said embodiment, although this invention was applied to the normally open solenoid valve 200, this invention is not limited to this, For example, you may apply to a normally closed solenoid valve.

  In the above embodiment, the electromagnetic valve of the present invention is applied to a vehicle brake hydraulic pressure control device mounted on a four-wheeled vehicle, but the present invention is not limited to this. For example, the electromagnetic valve of the present invention can be applied to a vehicle brake hydraulic pressure control device mounted on a motorcycle.

DESCRIPTION OF SYMBOLS 100 Vehicle brake hydraulic pressure control apparatus 200 Normally open type solenoid valve 210 Body member 220 Valve seat member 230 Valve body member 270 Orifice member 270A Press-fit part 270B Filter holding part 271 Orifice 280 Filter member

Claims (5)

In an electromagnetic valve comprising a valve seat member, a valve body member, a tubular body member that accommodates the valve seat member and the valve body member, and an orifice member having an orifice that restricts a flow rate,
The solenoid valve, wherein the orifice member is press-fitted inside the body member. A filter member,
The orifice member includes a press-fit portion that is press-fitted inside the body member, and a filter holding portion that is disposed outside the press-fit portion and holds the filter member radially inside.
2. The solenoid valve according to claim 1, wherein the filter holding portion has a smaller diameter on the side opposite to the press-fit portion than on the press-fit portion side.   The solenoid valve according to claim 1 or 2, wherein the orifice member becomes thinner as it approaches the orifice.   The electromagnetic valve according to any one of claims 1 to 3, wherein a coating layer is formed on the body member at a portion into which the orifice member is press-fitted.   The electromagnetic valve according to any one of claims 1 to 4, wherein the electromagnetic valve is a vehicular brake hydraulic pressure control device interposed in a hydraulic pressure path connecting a hydraulic pressure source and a wheel brake. A vehicular brake hydraulic pressure control device that performs hydraulic pressure control for controlling increase / decrease in brake hydraulic pressure acting on the wheel brake by controlling a valve.

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