Abstract:
A solenoid-controlled valve of an anti-lock brake system includes: a modulator block with inflow and outflow ports; an accommodating part connecting the ports including a valve sheet having a valve seat and an outflow cavity connected with the outflow port; a filter installed between the outflow cavity and the outflow port; a ball supporting part formed on a center of a housing in lengthwise direction; a spring supporting part formed on the ball supporting part; a compressing spring joined to the spring supporting part; a ball supported by an end terminal of the compressing spring; wherein the housing has a magnetic material and a coil body, and the ball opens and closes the valve seat due to the magnetic flux of the solenoid and force of the compressing spring.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a solenoid controlled valve of an anti-lock brake system, and particularly to a solenoid controlled valve of an anti-lock brake system such that: a modulator block having an inflow port and an outflow port is included; a value sheet is accommodated in an accommodating part formed in an interior of the modulator block; a housing formed by an electromagnet is joined to the valve sheet; a coil is combined to an outer peripheral plane of the housing, so that when a current is applied to the coil, magnetic fields is generated, and due to the housing formed by the electromagnet and back and forth movement of a ball accommodated in an end of the housing and an interior of the valve sheet, a valve port of an opening and closing cavity formed on the valve sheet is sealed, whereby a fluid is blocked. 
   2. Description of the Related Art 
   Generally, a sliding preventing braking system of a solenoid valve used for brake in a vehicle on which ABS (Antilock Braking System) is mounted, is configured such that: an ECU (Electronic Controlling Unit) detects the speed of a vehicle; the ECU transfers a signal to an actuator for control depending on road surface; the actuator prevents lock of a vehicle wheel by controlling oil pressure of a brake in each wheel cylinder using the signal from the ECU. 
   For an apparatus for controlling the speed of a vehicle by operation that brake oil flows into the modulator block from a master cylinder so that an oil pressure is adjusted, a solenoid valve for the ABS of the related art will be described in the following with reference to FIG.  1 . 
   The solenoid valve for the ABS of the related art consists of: a modulator block  10  having an inflow port  11  and an outflow port  12 ; a housing  20  mounted on an interior of the modulator block  10  and having an outflow cavity  21 ; a plunger  30  mounted on an interior of the housing  20  and having a projecting portion  31  in its end terminal; a valve sheet  40  formed on a side of the projecting portion  31  of the plunger  30  and accommodated in an interior of the housing  20 ; a compressing spring  50  joined to the projecting portion  31  of the plunger  30 , supported by lateral portion of the valve sheet  40 ; in which an orifice  60  between the valve sheet  40  and the inflow port  11 , is joined to the housing  20 ; a cover  70  joined to a lateral portion of the housing  20 , for accommodating the plunger  30 ; in which the plunger  30  is made of a permanent magnet. Therefore, when a current is applied to a coil  80 , the plunger  30  makes back and forth movements with respect to an opening and closing cavity  41  of the valve sheet  40 , whereby the valve port is opened and closed, and brake oil amount is adjusted accordingly. 
   The solenoid valve of the related art, having the foregoing construction for the ABS, requires a bushing  1  and an O-ring  2  for joining the housing  20  to the modulator block  10 , requiring an armature  3  accommodated in an interior of the coil  80  and joined to the plunger  30  and having a magnetic material, and requiring the orifice  60  for adjusting brake oil amount coming from the inflow port  11 , and the cover  70  for preventing brake oil from flowing into an outer peripheral plane of the valve sheet  40 . 
   As the foregoing, the solenoid valve of the related art, consists of a plurality of parts. Therefore, problems that assembly process is very complicated and inconvenient, and volume and weight of the solenoid valve become large and heavy, and production costs are increased, are generated. 
   SUMMARY OF THE INVENTION 
   To solve the above-indicated problems, it is, therefore, an object of the present invention to provide a solenoid controlled valve of an anti-lock brake system by incorporating a plunger, an armature, a housing into one single member, and by incorporating an orifice, a seal cup, a valve sheet into one single member, and by providing a ball for an opening and closing means sealed on and detached from an opening and closing cavity, whereby the volume is reduced half of the volume of the related art and production costs are reduced due to reduction of parts and new technology is achieved. 
   The foregoing and other objects and advantages are realized by providing a solenoid controlled valve of an anti-lock brake system, which includes: a modulator block; an inflow port formed on the modulator block; an outflow port formed on the modulator block and running through the inflow port; an accommodating part formed in an interior of the modulator block, for connecting the outflow port and the inflow port; a valve sheet mounted in an interior of the accommodating part, and having an opening and closing cavity in its one side, having an opening in its other side; an outflow cavity formed on an outer periphery of the valve sheet, for being connected with the outflow port; a filter installed between the outflow cavity and the outflow port; a housing adhered to a lateral side of the filter and joined to an inside of the opening; a ball supporting part formed on a center of the housing in lengthwise direction; a spring supporting part formed on an outer cylindrical surface of the ball supporting part; a compressing spring joined to the spring supporting part; a ball supported by an end terminal of the compressing spring; wherein the housing has a magnetic material, a coil body is joined to an outer peripheral plane on one side of the housing, and the ball is adhered to and detached from the opening and closing cavity by the ball supporting part and the compressing spring. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
       FIG. 1  is a cross-sectional view of a solenoid valve for vehicle brake system of the related art; 
       FIG. 2  is a side, cross-sectional view of a solenoid controlled valve of anti-lock brake system according to the present invention; 
       FIG. 3  is a cut-off, perspective view of a valve sheet according to the present invention; and 
       FIG. 4  is a side, cross-sectional view illustrating operation of a valve according to the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. 
   In the following description, same drawing reference numerals are used for the same elements even in different drawings. 
     FIG. 2  is a side, cross-sectional view of solenoid controlled valve of anti-lock brake system according to the present invention,  FIG. 3  is a cut-off, perspective view of a valve sheet according to the present invention, and  FIG. 4  is a side, cross-sectional view illustrating operation of a valve according to the present invention. 
   First of all, as shown in  FIG. 2 , the modulator block  100  includes an inflow port  110  having a flowing path so that brake oil may inflow from a master cylinder, and an outflow port  120  for draining the inflowing brake oil to a wheel cylinder. 
   Also, the inflow port  110  and the outflow port  120  are connected, so that an accommodating part  130  is formed in an interior of the modulator block  100 . The inflow port  110  is divided into an inlet flowing path  111  and an outlet flowing path  112 , and is mounted in the accommodating part  130 , and one side of a valve sheet  200  is joined to the outlet flowing path  112 . 
   Here, the valve sheet  200  is inserted in the outlet flowing path  112 , so that a self sealing part  240  is formed for isolation from the inlet flowing path  111 . Further, an outflow cavity  230  for running through the outflow port  120 , is formed on an outer periphery of the valve sheet  200 . Also, a filter  260  is formed between the outflow cavity  230  and the outflow port  120 , and is joined to the outer peripheral plane of the valve sheet  200 . 
   In the meantime, a housing  300  is adhered to a lateral side of the filter  260  and is joined to an inside of the opening  220 . 
   A housing  300  joined to the valve sheet  200 , has a ball supporting part  310  in its center of lengthwise direction. The ball supporting part  310  has a spring supporting part  320  on the outer cylindrical surface. Here, the spring supporting part  320  is preferably formed by a groove  330 . Also, a compressing spring  340 , one side of which is mounted on the spring supporting part  320  and the other side of which supports a ball  350 , is joined to an outer peripheral plane of the ball supporting part  310 . 
   Here, the ball supporting part  310  is of a shape such that an cylindrical surface of the groove  330  on which the compressing spring  340  is mounted, is large and the end terminal for supporting the ball gets small. Also, the ball supporting part  310  supported by an end terminal of the compressing spring  340 , is joined to the ball  350  adhered to the opening and closing cavity  210 . 
   Further, the ball supporting part  310  is preferably of a shape having concave portion  311  for accommodating the ball  350  when the ball  350  is detached from the opening and closing cavity  210 . 
   In the meantime, the housing  300  has, on its one side, the ball supporting part  310  and is joined to the valve sheet  200  and has, on its other side, a shape of shaft so that a coil body  400  is joined to an outer peripheral surface. Here, the housing  300  has a magnetic material and is made of aluminum. 
   Shape of the valve sheet will be described in detail with reference to a cut-off, perspective view of the valve sheet according to the present invention as shown in FIG.  3 . 
   The valve sheet  200  has a sticking plane  250  coming into contact with a ball  350  at a side of the opening and closing cavity  210 . The sticking plane  250  has an arc whose size is the same as the size of the relevant portion in the outer peripheral plane of the ball  350 . 
   A rounded portion extended from the sticking plane  250 , is formed inward by first bending so that the rounded portion encloses a partial plane of the ball  350 . Also, another rounded portion having a big arc, extended from the rounded portion formed by the first bending, is formed outward by second bending, and still another rounded portion extended from the rounded portion formed by the second bending, is formed in a joining portion of the valve sheet  200  so that the rounded portion completes the outlet flowing path  112  of the inflow port  110 . 
   The cross-sectional shape of the valve sheet  200  is symmetric with respect to the center of the opening and closing cavity  210 , and the bending portions are formed by rolling process using press, and preferably made of stainless steel. 
   Operation of the solenoid controlled valve of the anti-lock brake system having the foregoing construction, will be described with reference to  FIG. 4  in the following. 
   In the anti-lock brake system according to the present invention, in case that the ECU of the ABS determines to make a control for generating brake oil flow between the inflow port and the outflow port according to a signal from a detecting sensor for sensing a vehicle wheel speed and a road surface, the ECU applies a current to the coil body  400 . 
   If a current is applied to the coil body  400 , magnetic force is generated and transferred to the housing  300  having the magnetic material. The ball supporting part  310  attracts the ball  350  by the magnetic force transferred to the housing  300 , so that the opening and closing cavity  210  formed on the valve sheet  200  is opened. 
   In that case, because the flowing path between the inflow port  110  and the outflow port  120  is opened, the brake oil is drained to the wheel cylinder from the master cylinder. 
   In the first place, one side of the ball  350  is supported by the compressing spring, which is joined to grooves  330  formed on the outer peripheral surface of the ball supporting part  310 . Also, one side of the ball  350  is pushed by the elastic force of the compressing spring  340 , and the other side of the ball  350  seals the opening and closing cavity  210  formed on the sticking plane  250  of the valve sheet  200 . 
   In case that the opening and closing cavity is opened, the brake oil is provided through the inflow port  110  from the master cylinder and is delivered to the opening and closing cavity  210  of the valve sheet  200  mounted on the outlet flowing path  112  of the inflow port  110 , and is transferred to the outflow cavity  230  formed on the outside of the valve sheet  200 . After that, the brake oil passes through the filter  260 , where an alien substance is eliminated, and flows to the wheel cylinder past the outflow port  120 . 
   Here, in order for swift flowing of the brake oil, the valve sheet  200  has a plurality of bending portions on its lateral side, so that the brake oil is provided to the opening and closing cavity  210 . In other aspect, a plurality of bending portions is formed for resisting the elastic force of the compressing spring pushing the ball  350 , and for accommodating the ball  350 . 
   In the meantime, in case that it is determined that flowing path between the inflow port  110  and the outflow port  120 , should be closed, a current applied to the coil  400  is cut off, so that the brake oil flow is stopped. 
   Namely, the opening and closing cavity  210  is opened by a current applied to the coil body  400  under control of the ECU and is closed by the elastic force of the compressing spring  340 , whereby the brake oil flow between the inflow port  110  and the outflow port  120  is possibly controlled. 
   As is apparent from the foregoing, the present invention has the following effects. 
   Firstly, the housing, the plunger and armature of the related art are incorporated into one single member, whereby remarkable reduction in parts and reduction in costs are achieved. 
   Secondly, the valve sheet is installed in the outlet flowing path of the inflow port of the housing so that blocking barrier separating from the inlet flowing path is formed without additional work and process, whereby assembling process becomes simple. 
   Thirdly, the opening and closing cavity side of the valve sheet has the sticking plane coming into contact with the ball and the valve sheet has the rounded portion connected with the sticking plane, and bent outward, for enclosing partial plane of the ball in its inside, so that the seal cup, the orifice, and the valve sheet are incorporated into one single member, whereby reduction in parts is possibly achieved. 
   Fourthly, the shape of the opening and closing cavity in the valve sheet is formed by the rounded portion due to a plurality of bending, so that the valve sheet is not transformed when used for a long time and the brake oil amount in the flowing path is maintained constant. Therefore, brake control is performed smoothly. 
   Resultantly, the present invention has effects of making assembly process easy and simple, reducing weight, and reducing production costs. 
   While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.