JP6000885B2 - Seal valve and manufacturing method thereof - Google Patents

Description

  The present invention relates to a seal valve and a manufacturing method thereof.

  The seal valve opens and closes the fluid passage by bringing a valve body into contact with and away from a valve seat provided in the fluid passage, and is incorporated in, for example, a solenoid valve of an ABS actuator of an automobile. The seal valve needs to ensure the required sealing performance by bringing the valve seat and the valve body into good contact with each other. For this reason, after the seal valve is assembled, a leak test is performed in a state where the valve seat is pressed against the valve body, and it is confirmed that the leak amount is not more than a predetermined value.

  Thus, in order to reduce the leak amount of the seal valve to a predetermined value or less, the close contact state between the valve seat and the valve body is important, and therefore it is necessary to process the valve seat with high accuracy. For this reason, the valve seat is usually subjected to cutting, but there is a possibility that the required sealing performance cannot be guaranteed only by this. For example, if the valve seat is polished after cutting, the processing accuracy can be increased and the amount of leakage can be suppressed, but the processing cost increases.

  For example, in Patent Document 1, a valve body (ball valve or the like) is pressed against a valve seat and is plastically deformed (surface pressing process), thereby improving the adhesion between the valve seat and the valve body.

JP 2002-54757 A

  By the way, depending on the position of the valve seat in the main body of the seal valve, high-precision cutting may be difficult. For example, as shown in FIG. 1A, the valve seat 11b provided at the shaft center of the main body 10 of the seal valve 1 can be processed by applying a cutting tool to the valve seat 11b while rotating the main body 10. On the other hand, the valve seat 12c provided at a position offset from the axis of the main body 10 needs to be processed by pressing against the valve seat 12c of the fixed main body 10 while rotating the cutting tool. Generally, when cutting by rotating a tool, the processing accuracy is lower than when cutting by rotating a workpiece, so the valve seat 12c provided at the position offset from the axis as described above is Cutting accuracy is lower than that of the valve seat 11b provided at the shaft center. As described above, when the dimensional accuracy (particularly roundness) of the valve seat after cutting is low, the desired roundness cannot be obtained even if the surface pressing process as in Patent Document 1 is performed thereafter. There is.

  The technical problem to be solved by the present invention is to guarantee the roundness of the valve seat by a low-cost method and suppress the leak amount even when the valve seat is provided at a position where high-precision cutting is difficult. It is to provide a seal valve that can be used.

  A seal valve according to the present invention, which has been made to solve the above problems, includes a main body having a fluid passage, a valve seat provided in the fluid passage, and a valve body provided so as to be seated on the valve seat. The valve seat is coated with at least the valve seat, and an annular surface pressing trace is formed in a portion of the valve seat that contacts the valve body. Is.

  In this way, by performing a surface pressing process on the valve seat, it is possible to bring the surface pressing marks and the valve body into contact with each other all around. However, if the valve seat is formed in a place where high-precision cutting is difficult, the surface roughness of the valve seat becomes rough. As a result, the roundness of the valve seat deteriorates and leaks occur. The present invention has been made paying attention to this point, and by applying coating to the valve seat to reduce the surface roughness, the roundness of the valve seat is ensured, and leakage that cannot be suppressed only by surface pressing. Can be reliably suppressed.

  For example, when the surface roughness of the valve seat subjected to the coating treatment is Rz 3.2 μm or less, the roundness can be sufficiently increased (for example, to 5 μm or less) by the surface pressing process.

  For example, electroless plating can be applied as the coating treatment.

  The above-described seal valve is formed into a ring shape by cutting the valve seat, performing a coating process on at least the valve seat, and pressing and deforming the valve seat with a jig having the same shape as the valve body. Can be manufactured through a surface pressing step for forming a surface pressing mark.

  As described above, according to the seal valve of the present invention, even when the valve seat is provided at a position where high-precision cutting is difficult, the roundness of the valve seat is ensured by a low-cost method, and the leak amount is reduced. Can be suppressed.

(A) is sectional drawing of the main body of the seal valve which concerns on one Embodiment of this invention, (b) is the side view seen from the B direction of (a) figure, (c) is from the C direction of (a) figure. FIG. (A) is an expanded sectional view near the valve seat 11b of the main fluid passage of the main body, and (b) is an enlarged view of the vicinity of the valve seat 12c of the auxiliary fluid passage of the main body. It is a block diagram which shows the procedure of the manufacturing method of a seal valve. It is sectional drawing of the main body raw material formed by the forging process. It is an expanded sectional view which shows a mode that a coating process is performed to a cutting surface. It is sectional drawing which shows a mode that a surface pressing process is performed to a main body raw material. It is sectional drawing of the solenoid valve of the ABS actuator incorporating the said seal valve. It is sectional drawing of the seal valve which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the seal valve 1 of the present embodiment includes a main body 10, a ball 20 as a main valve body, and a ball 30 as a sub valve body.

  The main body 10 has a substantially disk shape. The main body 10 is provided with a fluid passage through which a fluid (for example, oil) can flow. In the present embodiment, the main fluid passage 11 is provided in the axial center of the main body 10, and the auxiliary fluid passage 12 is provided at a position offset from the axial center of the main body 10. The axes of the main fluid passage 11 and the sub fluid passage 12 are parallel to the axis of the main body 10.

  The main fluid passage 11 opens to one end face (right end face in FIG. 1) of the main body 10 and opens to the other end face (left end face in FIG. 1) of the main body 10 and communicates with the small diameter passage 11a. And a valve seat 11b. The small diameter passage 11a is a cylindrical surface, and the valve seat 11b is a tapered surface having a reduced diameter on one side in the axial direction.

  The sub-fluid passage 12 includes a small-diameter passage 12a that opens to the other end face (the left end face in FIG. 1) of the main body 10, a large-diameter passage 12b that opens to one end face (the right-side end face in FIG. 1), and a small diameter. And a valve seat 12c provided between the passage 12a and the large-diameter passage 12b. The small diameter passage 12a and the large diameter passage 12b are cylindrical surfaces. The valve seat 12c is a tapered surface having a diameter reduced on the other side in the axial direction, and is continuous with the small diameter passage 12a and the large diameter passage 12b.

  On the valve seats 11b and 12c, annular surface pressing marks 14 and 15 are formed. The surface pressing marks 14 and 15 are formed by pressing a ball jig having the same diameter as the balls 20 and 30 against the valve seats 11b and 12c, and transferring the shape of these ball jigs to the valve seats 11b and 12c. (Details will be described later). As shown in FIGS. 1B and 1C, the surface pressing marks 14 and 15 are provided in an annular shape in the intermediate portion (portion excluding both ends in the axial direction) of the valve seats 11b and 12c. The surface pressing marks 14 and 15 are provided in contact portions with the balls 20 and 30 in the valve seats 11b and 12c, and the balls 20 and 30 have circular shapes having the same diameter as the contact portions with the valve seats 11b and 12c. Is made. The surface pressing marks 14 and 15 have a roundness of 5 μm or less, preferably 3 μm or less.

  As shown in FIG. 2, at least the valve seats 11 b and 12 c in the main body 10 are subjected to a coating process. In the present embodiment, the electroless plating layer 13 is applied to the entire surface of the main body 10 including the inner peripheral surfaces of the fluid passages 11 and 12. The electroless plating layer 13 is made of nickel, for example. The surface roughness of the valve seats 11b and 12c to which the electroless plating layer 13 is applied is Rz 3.2 μm or less, preferably 1.6 μm or less.

  When the seal valve 1 having the above configuration is opened, that is, when the balls 20 and 30 are separated from the valve seats 11b and 12c, fluid can be circulated through the fluid passages 11 and 12. On the other hand, in a state where the seal valve 1 is closed, that is, in a state where the balls 20 and 30 are pressed against the valve seats 11b and 12c, the fluid flow through the fluid passages 11 and 12 is restricted.

  Hereinafter, the manufacturing method of the seal valve 1 having the above configuration will be described focusing on the method of forming the main body 10. As shown in FIG. 3, the seal valve 1 is subjected to a forging process, a cutting process, a coating process (electroless plating process), a surface pressing process, and an assembly process.

  In the forging process, as shown in FIG. 4, a main body material 10 ′ having substantially the same shape as the main body 10 is formed. Through holes 11 'and 12' having tapered surfaces 11b 'and 12c' are formed in the main body material 10 '.

  In the cutting process, cutting is performed on the tapered surfaces 11b 'and 12c' of the main body material 10 'shown in FIG. Specifically, first, while rotating the main body material 10 ′ around the axis, the cutting tool is applied to the tapered surface 11 b ′ provided on the axis of the main body material 10 ′ to perform cutting. Thereafter, in a state where the main body material 10 ′ is fixed, another cutting tool is applied to the tapered surface 12 c ′ while rotating to perform cutting. When a workpiece is subjected to cutting (turning), generally, the cutting accuracy is higher when the workpiece is rotated than when the tool is rotated. In the present embodiment, the tapered surface 11b ′ cut by rotating the main body material 10 ′ is processed with high accuracy. For example, the roundness is 5 μm or less (preferably 3 μm or less), and the surface roughness Rz is 3.2 μm or less (preferably 1. 6 μm or less). On the other hand, the taper surface 12c 'cut by rotating the cutting tool has lower processing accuracy than the taper surface 11b', and has, for example, a roundness of about 20 μm and a surface roughness Rz of about 6.3 μm. After the cutting process, the main body material 10 ′ may be subjected to a heat treatment process, a shot / barrel process, a fermite process, and the like as necessary.

  Thereafter, the main body material 10 ′ is subjected to a coating process. In the present embodiment, electroless plating, particularly nickel electroless plating is performed as the coating treatment. Specifically, by immersing the main body material 10 ′ in a plating bath containing nickel, the entire surface of the main body material 10 ′ including the inner peripheral surfaces of the through holes 11 ′ and 12 ′ is subjected to nickel electroless plating. . As a result, as shown in FIG. 5, the electroless plating layer 13 is coated on the tapered surfaces 11b 'and 12c' subjected to the cutting process, and the surface roughness is improved. In particular, the tapered surface 12c ′ located at a position offset from the axis of the main body material 10 ′ is difficult to cut with high accuracy, and has a relatively rough surface as described above. The coating material (electroless plating layer 13) enters the traces and the surface roughness is reduced. Specifically, the coating process is performed so that the surface roughness of the tapered surfaces 11b 'and 12c' is Rz 3.2 µm or less, preferably 1.6 µm or less.

  Thereafter, a surface pressing process is performed on the main body material 10 '. In the surface pressing step, as shown in FIG. 6, a jig ball 20 ′ having the same diameter as the ball 20 is pressed against the tapered surface 11b ′, and a jig having the same diameter as the ball 30 is pressed against the tapered surface 12c ′. The tool ball 30 ′ is pressed to plastically deform part of the tapered surfaces 11b ′ and 12c ′. The jig balls 20 ′ and 30 ′ are pressed in parallel with each other without rotating with respect to the main body material 10 ′. As a result, annular surface pressing marks 14 and 15 are formed on the tapered surfaces 11b 'and 12c' (valve seats 11b and 12c), respectively (see FIG. 1). The jig balls 20 ′ and 30 ′ are made of a material harder than the balls 20 and 30, respectively. The roundness of the jig balls 20 ′ and 30 ′ is 5 μm or less, preferably 3 μm or less, and the surface roughness of the jig balls 20 ′ and 30 ′ is Rz 3.2 μm or less, preferably 1.6 μm or less. . The main body 10 is completed by this surface pressing. Thereafter, the seal valve 1 is completed by assembling the main body 10 and the balls 20 and 30.

  As described above, the valve seat of the seal valve 1, in particular, the valve seat 12c at a position offset from the axis of the main body 10 is coated to improve the surface roughness of the valve seat 12c. The roundness of the surface pressing mark 15 formed on the seat 12c is improved. Thereby, since the adhesiveness of the valve seat 12c and the ball | bowl 30 is improved, the leak of the subfluid channel | path 12 is suppressed and a sealing performance is improved.

  Strictly speaking, the surface pressing marks 14 and 15 formed on the valve seats 11b and 12c are spherical with the same diameter as the jig balls 20 ′ and 30 ′, that is, spherical with the same diameter as the balls 20 and 30. It is formed in a shape. Accordingly, when the width of the surface pressing marks 14 and 15 (the width of the valve seats 11b and 12c in the generatrix direction) is large, when the balls 20 and 30 are pressed against the valve seats 11b and 12c and the seal valve 1 is closed, a spherical shape is obtained. The balls 20 and 30 are fitted into the surface pressing marks 14 and 15. In this case, when the seal valve 1 is subsequently opened, the balls 20 and 30 may be caught by the surface pressing marks 14 and 15 and hardly come apart from the valve seats 11b and 12c. In the present embodiment, as described above, the valve seats 11b and 12c are coated to smooth the surface, so that the above-described catch is prevented and the seal valve 1 can be opened and closed smoothly. Become.

  Said seal valve 1 is integrated in the solenoid valve 200 of the ABS actuator 100 as shown, for example in FIG. The ABS actuator 100 controls the brake fluid pressure, and is provided between the wheel cylinder 101 and the master cylinder 102. The solenoid valve 200 includes a guide 201 fixed to the recess of the housing 103 a of the ABS actuator 100, a shaft 202 inserted into the inner periphery of the guide 201, and an inner periphery of the guide 201, and is arranged on the distal end side of the shaft 202. The seal valve 1 is mainly provided. The main body 10 of the seal valve 1 is coaxially disposed on the distal end side of the shaft 202. The ball 20 is disposed between the valve seat 11 b of the main fluid passage 11 and the tip of the shaft 202. The ball 30 is disposed between the valve seat 12 c of the auxiliary fluid passage 12 and the ball stopper 207.

  The solenoid valve 200 is normally not energized to the coil 213. In this state, the spring 202 urges the shaft 202 and the plunger 211 upward in the drawing. As a result, the ball 20 of the seal valve 1 can be moved between the valve seat 11b and the tip of the shaft 202 in the vertical direction. Therefore, the flow path 103 b on the wheel cylinder 101 side and the flow path 103 c on the master cylinder 102 side are in communication with each other via the main fluid passage 11 of the seal valve 1.

  When the pump 106 is operated, the ball 30 of the seal valve 1 is pressed against the valve seat 12c, and the auxiliary fluid passage 12 is closed. Accordingly, the brake fluid flows from the wheel cylinder 101 side to the master cylinder 102 side only through the main fluid passage 11 of the seal valve 1.

  When the operation of the pump 106 is stopped, the ball 30 of the seal valve 1 is separated from the valve seat 12c, and the auxiliary fluid passage 12 is opened. Accordingly, the brake fluid is quickly returned from the master cylinder 102 side to the wheel cylinder 101 side via the main fluid passage 11 and the sub fluid passage 12 of the seal valve 1.

  When the pump 106 is operated and the coil 213 is energized, the ball 30 of the seal valve 1 is pressed against the valve seat 12c to close the auxiliary fluid passage 12, and the plunger 211 and the shaft 202 move downward in the figure, The ball 20 of the valve 1 is pressed against the valve seat 11b, and the main fluid passage 11 is closed. As a result, the wheel cylinder 101 increases in pressure. Therefore, the pressure of the wheel cylinder 101 can be adjusted by adjusting the energization amount to the coil 213 to open and close the main fluid passage 11.

  The present invention is not limited to the above embodiment. For example, the seal valve of the present invention may be applied to a backflow prevention valve. For example, the seal valve 41 (backflow prevention valve) shown in FIG. 8 includes a main body 42, a ball 43, a spring 44, and a case 45. The main body 42 has a fluid passage 46, and a spherical valve seat 46 a is provided at the opening side end of the fluid passage 46. The valve seat 46a is formed with an annular surface pressing trace (not shown) formed by pressing a jig ball having the same diameter as the ball 43. The specifications of the valve seat 46a and the surface pressing trace are the same as in the above embodiment.

  In the above embodiment, the entire surface of the main body material 10 ′ including the tapered surfaces 11b ′ and 12c ′ is coated. However, the tapered surface 11b ′ at the axis of the main body material 10 ′ is subjected to the cutting process. Since the surface roughness is small (Rz 3.2 μm or less), it is not necessary to perform the coating treatment. Therefore, only a part of the surface of the main body material 10 'may be coated. For example, only the tapered surface 12c 'may be coated by immersing the main body material 10' in a plating bath in a state where masking is applied to the portion other than the tapered surface 12c '.

  Moreover, the coating process should just be a method which can improve the surface roughness of the valve seat which gave cutting, for example, electroplating, a vapor deposition process, etc. can also be employ | adopted for it. However, electroless plating is preferable because a very smooth surface can be obtained. Further, the valve body is not limited to a ball, and may have, for example, a tapered surface.

  In the above-described embodiment, the case where the surface pressing process is performed after the coating process is performed is shown, but conversely, the surface treatment may be performed and then the coating process may be performed.

DESCRIPTION OF SYMBOLS 1 Seal valve 10 Main body 11 Main fluid passage 11b Valve seat 12 Sub fluid passage 12c Valve seat 13 Electroless plating layer (coating layer)
14, 15 Surface stamping marks 20 balls (main valve body)
30 balls (sub-valve)

Claims (4)

A seal valve comprising a main body having a fluid passage, a valve seat provided in the fluid passage, and a valve body provided to be seatable on the valve seat,
A seal valve characterized in that at least the valve seat is coated, and an annular surface pressing trace is formed in a portion of the valve seat that contacts the valve body.   The seal valve according to claim 1, wherein a surface roughness of the valve seat subjected to the coating treatment is Rz 3.2 μm or less.   The seal valve according to claim 1 or 2, wherein the coating treatment is electroless plating. A method for producing a seal valve comprising a main body having a fluid passage, a valve seat provided in the fluid passage, and a valve body provided to be seatable on the valve seat,
A cutting step of cutting the valve seat, a coating step of applying a coating treatment to at least the valve seat, and pressing the jig having the same shape as the valve body against the valve seat to cause plastic deformation, A manufacturing method of a seal valve having a surface pressing step for forming surface pressing marks.

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