JP5374314B2 - Waterproof structure of flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure of a flow control valve wherein a sealing structure for preventing a fluid flowing through a valve from reaching a stator is configured very easily. <P>SOLUTION: The waterproof structure of a flow control valve consists of: two bobbins 5; yokes A1 each consisting of a circumferential step part 3 formed on the rear surface of an annular plate 1 closely to the outer peripheral edge thereof and a joint 4 formed along the outer peripheral edge of the circumferential step part 3; a large O-ring 71; a small O-ring 72, a casing B; and a central yoke body A formed by bonding two yokes A1. The bobbins 5 are arranged with the small O-ring 72 between the upper and lower surfaces of the central yoke body A, and the O-ring 72 is held between the flange-like plates 52 of both bobbins 5. The large O-ring 71 is placed in the circumferential step parts 3 of both yokes other than the central yoke body A, and the large O-ring 71 arranged in the circumferential step part 3 of each yoke A1 is held by the casing B. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a waterproof structure for a flow rate control valve in which a seal structure for preventing a fluid flowing in a valve from reaching a stator can be very simply configured in a control motor for controlling the operation of the valve.

  In recent years, various developments have been made to meet the market demands for environmentally friendly and fuel-efficient vehicles. Among them, the engine temperature has a large effect on fuel consumption and exhaust gas, so it has cooled more than ever. The importance of water temperature control is increasing. Therefore, in place of the conventionally used thermosensitive thermostat, the development of an electric flow control valve capable of finely controlling the opening and closing of the valve by motor control has become active.

  This is done by measuring the water temperature with a water temperature sensor so that the cooling water temperature rising due to the combustion heat of the engine becomes an appropriate water temperature, and driving and controlling the motor of the electric flow control valve according to the operating situation. Is opened and closed, and each flow rate circulating through the radiator, the bypass flow path, the heater core and the like is controlled. As this type, the following patent document 1 is given as an example of a stepping motor that drives a refrigerant flow rate adjustment valve in an outdoor unit of an air conditioner, although it is not for a vehicle that is a technical field of the present invention.

JP 2007-282479 A

  In Patent Document 1, since the motor is installed outside the valve chamber, water resistance is required. Therefore, waterproofing is performed using a potting resin [sealing resin (40)]. However, when filling the sealing resin (40), the liquid level of the sealing resin (40) must be monitored during the operation, and after filling, until the sealing resin (40) is cured. It is something you have to wait for. The monitoring of the liquid level is a great effort if it is performed by an operator, and it is almost impossible to eliminate the human error. In addition, if the apparatus is used, a liquid level detection device or the like is required, which increases the manufacturing cost.

  Further, although there is no particular description of the stator core (81, 82) of Patent Document 1, the yoke of a motor generally used for a vehicle is not subject to rust caused by intrusion of water or the like from the outside, or winding (5). It is usually painted or plated to avoid short circuits due to insufficient insulation. In such a state, when the cylindrical engaging convex portion (810) and the cylindrical engaging concave portion (820) are engaged, the engaging convex portion (810) and the engaging concave portion are caused by "rubbing" during engagement. There is a possibility that the coating or plating at (820) will be peeled off. Since Patent Document 1 uses a potting resin [resin for sealing (40)], even if the coating or plating is peeled off, it is covered with the sealing resin (40), so that rust is generated. No.

  However, when an O-ring is used as a waterproof means, the stator core is rusted by the cooling water from the part where the coating or plating is peeled off. Therefore, it is difficult to use the configuration of Patent Document 1 for a vehicle flow control valve that is waterproof with an O-ring. Furthermore, the inner stator core (81) having the engaging convex portion (810) and the inner stator core (82) having the engaging concave portion (820) are different in the shapes of the engaging convex portion (810) and the engaging concave portion (820). Thus, the part shape is different. As a result, the types of parts to be assembled (number of parts) increase, and there is a problem that work efficiency deteriorates. An object (technical problem) of the present invention is that the assembly time is short, the assembly is easy, the yoke does not rust even when an O-ring is used, and the flow control valve has excellent waterproofness. An electric flow control valve is provided that has a waterproof structure, and thus has no power loss because there is no mechanical seal or rubber lip seal for waterproofing, and has low power consumption and low cost.

  Therefore, as a result of intensive studies and studies by the inventors to solve the above-described problems, the inventor of the invention according to claim 1 is made up of two bobbins in which bowl-shaped plates are formed at both axial ends of the cylindrical portion, and an annular plate. Comb teeth formed at equal intervals on the periphery of the central through hole, a circumferential step portion formed on the back surface of the annular plate portion and near the outer periphery, and an outer periphery of the circumferential step portion. The large ring O-ring is sandwiched between the circumferential stepped portions of the yoke, the large ring O-ring, the small ring O-ring, the casing, and the two yokes. A central yoke body formed by joining the yokes via a portion, and the bobbin is disposed with the small ring O-rings sandwiched between the upper and lower surfaces of the central yoke body. A central yoke body arranged so that the small ring O-ring is sandwiched between plates A waterproof structure for a flow control valve in which a large ring O-ring is mounted on the circumferential stepped portions of both outer yokes, and the large ring O-ring disposed on the circumferential stepped portion of each yoke is sandwiched by the casing. As a result, the above problems were solved.

  According to a second aspect of the present invention, in the first aspect, the joint portion of the central yoke body includes a trapezoidal rising portion and a fitting protrusion formed at the center in the width direction of the top of the trapezoidal rising portion. A flow control valve comprising a trapezoidal joining piece formed at equal intervals along the outer peripheral edge of the base plate, and a fitting recess formed between the trapezoidal joining pieces and into which the fitting projection is press-fitted. The above-mentioned problem was solved by adopting a waterproof structure. According to a third aspect of the present invention, in the first aspect, the joint portion of the central yoke body has rectangular or square rectangular fitting pieces formed at equal intervals along the outer peripheral edge of the yoke, and the adjacent ones. The above-described problems have been solved by adopting a waterproof structure for the flow rate control valve in which the rectangular fitting piece is press-fitted into the fitting gap between the fitting pieces.

  According to a fourth aspect of the present invention, in the first aspect, the joint portion of the central yoke body is formed such that an outer cylindrical fitting portion is formed on the outer peripheral edge of the circumferential step portion on one yoke and the yoke on the other side. The above problem has been solved by providing a waterproof structure for the flow rate control valve in which an inner cylindrical fitting portion having a diameter that can be press-fitted into the inner peripheral side of the outer cylindrical fitting portion is formed. According to a fifth aspect of the present invention, in the description of any one of the first, second, third, and fourth aspects, the circumferential positioning in which the small ring O-ring is fitted on the outer surface side of the two scissors-like plates of the bobbin. By providing a waterproof structure for the flow rate control valve in which a groove is formed, the above problem has been solved. According to a sixth aspect of the present invention, in the first, second, third, fourth or fifth aspect, the casing is provided with a casing main body portion and a casing cover portion, and the casing main body portion and the casing cover portion. The above problems have been solved by providing a waterproof structure for the flow rate control valve in which a circumferential positioning shallow groove into which the large ring O-ring is fitted is formed.

  According to the first aspect of the present invention, two of the four yokes are combined to form a central yoke body. The central yoke body itself is waterproof while holding the large ring O-ring between the two yokes. Further, the bobbin is disposed while sandwiching the small ring O-ring between the both surfaces of the central yoke body and the flanged plate on one side of the bobbin, and further, the small ring O is defined by the other plate of the bobbin and the surface of the remaining yoke. Since the ring is sandwiched and the large ring O-ring is sandwiched between the yoke and the casing disposed on both bobbins, the inside and outside of the bobbin are configured to be shut off in a waterproof manner.

  Accordingly, a waterproof motor case is constructed by assembling only the four yokes, the two bobbins, the large ring O-ring, the small ring O-ring, the casing body, and the case cover. . In particular, since no potting resin is used as in the prior art, the operation can be completed easily by combining the components, and the operation can be completed in a short time.

  Further, the yoke constituting the central yoke body is provided with a joint portion for joining the two yokes by press-fitting means on the outer peripheral edge thereof. Therefore, it is possible to tentatively assemble the yokes before assembling them, thereby reducing the number of parts to be assembled and reducing the labor of the operator. Further, the joint portion of the yoke is formed on the outer peripheral edge, and the large ring O-ring is located on the inner side of the yoke, so that the cooling water does not reach the joint portion of the central yoke body. Therefore, even if the coating or plating applied to the yoke at the press-fitting site is peeled off, the cooling water does not reach as described above, so that no rust is generated at the press-fitted portion of the joint. Further, the joint portion is formed on the outer peripheral edge of the yoke, and also serves as a wall surface that constitutes a storage groove of the large ring O-ring. Therefore, even if the joint portions of the yoke are press-fitted and joined, the outer diameter of the yoke is not particularly large, and no dedicated member is required for press-fitting.

  In the invention of claim 2, in the central yoke body, the joint portion is composed of a trapezoidal trapezoidal rising portion and a fitting projection formed at the center in the width direction of the top of the trapezoidal rising portion. As a result, when the two yokes are combined, the inclined sides of the trapezoidal rising portion are in contact with each other even if the positions of the fitting protrusion and the fitting recess are not exactly matched at the initial stage. Then, by moving while abutting each other, the fitting projection and the fitting recess are brought close to each other, and the fitting projection and the fitting depression can be fitted with only a slight alignment.

  In the invention of claim 3, the shape of the joint portion is simplified by adopting a substantially rectangular rectangular fitting piece and a fitted gap portion into which the rectangular fitting piece is fitted. The yoke can be easily manufactured. In the invention of claim 4, the joint portion comprises an outer cylindrical fitting portion and an inner cylindrical fitting portion having a diameter capable of being press-fitted into the inner peripheral side of the outer cylindrical fitting portion, both of which have a flat cylindrical shape. Yes, the shape of the joint can be simplified, and the yoke can be easily manufactured. In the invention of claim 5, since the circumferential positioning groove into which the small ring O-ring is fitted is formed on the outer surface side of the both bowl-shaped plates of the bobbin, the small ring O-ring can be installed in a stable state. it can. In addition, no dedicated member is required for installation. In the invention of claim 6, since the circumferential positioning shallow groove into which the small ring O-ring is fitted is formed in the case main body and the case cover, the small ring O-ring can be installed in a more stable state. There are advantages. In addition, no dedicated member is required for installation.

(A) is sectional drawing which shows the motor structure of the flow control valve in this invention, (B) is a block diagram which shows a motor chamber and a valve chamber. It is an exploded sectional view of the principal part in the present invention. (A) is a perspective view in which the central yoke body is separated into two yokes, (B) is a perspective view of the central yoke body, and (C) is a longitudinal side view in which the central yoke body is separated into two yokes. (A) is the side view which isolate | separated the center yoke body which has a junction part of 1st Embodiment into two yokes, (B) is a side view of the center yoke body which has a junction part of 1st Embodiment, (C) FIG. 4D is a rear view of the yoke, FIG. 4D is an enlarged side view in the middle of the joint portion of the first embodiment being fitted and joined, and FIG. 5E is an enlarged side view of the joint portion of the first embodiment being fitted and joined. (A) is the side view which isolate | separated the center yoke body location which has a junction part of 2nd Embodiment into two yokes, (B) is a side view of the center yoke body which has a junction part of 2nd Embodiment, (C ) Is an enlarged perspective view of the joint portion of the second embodiment. (A) is sectional drawing which isolate | separated the central yoke body location which has a junction part of 3rd Embodiment into two yokes, (B) is sectional drawing of the central yoke body location which has a junction part of 3rd Embodiment. . (A) is the perspective view which partially cut off the bobbin, (B) is a vertical side view of a bobbin. (A) is an expanded sectional view which shows the structure of the principal part of this invention, (B) is the (A) part enlarged view of (A), (C) is the (A) part enlarged view of (A). It is a principal part expanded sectional view which shows embodiment by which the positioning shallow groove was formed in the casing main-body part and the casing cover part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention relates to a waterproof structure for a motor portion that controls the operation of a valve, particularly in an electric flow control valve. The electric flow control valve in the present invention is provided in the middle of the vehicle coolant circuit. As shown in FIGS. 1 and 2, the configuration of the present invention is mainly composed of a yoke A1, a central yoke body A, a bobbin 5, a casing B (a casing main body portion 100, a casing cover portion 200), and the like. Then, the coil 54 is wound around the bobbin 5 to function as an electromagnet, but the yoke is further arranged to concentrate the magnetic force.

  An inner magnet 8 is fixed to the valve driving shaft 9, and the shaft rotates by driving the motor. However, the shaft does not continue to rotate like a general motor, and reciprocates at a predetermined angle. It will rotate as you do. A stepping motor is suitable as such a motor. And the casing B which covers all the motor parts is comprised from the casing main-body part 100 and the casing cover part 200. FIG. Further, the shaft end of the valve driving shaft 9 enters the valve chamber 301 of the valve casing 300 and has a function of adjusting the flow rate by operating the rotary valve (flow rate control valve) 400 [FIG. reference〕.

  As shown in FIGS. 3A, 4A, etc., the yoke A1 is composed of an annular plate portion 1, a comb tooth 2, and a circumferential step portion 3. Since the yoke A1 is a member through which magnetic force passes, the material is magnetic metal (mainly iron). The yoke A1 is subjected to rust prevention means such as painting and plating in order to prevent rust. A total of four yokes A1 are used. Then, two yokes A1, A1 are joined together from the four yokes A1, A1,... To form a central yoke body A to be described later (FIGS. 3B and 4). (See (B) etc.)].

  A joint 4 such as a wedge shape that can be press-fitted into each other is formed on the outermost circumferential portion of the yoke A1 in the radial direction. The two yokes A1 and A1 are combined in a pair of upper and lower portions, and each joint 4 , 4 are press-fitted together so that the yokes A1, A1 are joined together to form the central yoke body A. The remaining two yokes A1 are used alone. The annular plate portion 1 has a front surface 1a and a back surface 1b. The annular plate portion 1 is formed in a substantially disc shape, and a through hole 11a is formed at the center thereof, and a plurality of comb teeth 2 are arranged at equal intervals along the periphery of the through hole 11a. 2,... Are formed upright on the surface 1a (see FIGS. 3A and 3C).

  A circumferential step 3 is formed on the back surface 1b of the annular plate 1 and near the outer peripheral edge, and a joint 4 is formed on the outer periphery of the circumferential step 3 [FIG. See FIG. 4C]. The circumferential step portion 3 includes a step wall portion 31 and a bottom portion 32. The step wall surface portion 31 is a circumferential vertical surface or inclined surface that is stepped with respect to the annular plate portion 1, and the bottom surface portion 32 is continuous with the outer end of the step wall surface portion 31 and the annular plate portion. 1 is a stepwise circumferential flat surface that is substantially parallel to 1. The step wall surface portion 31 and the bottom surface portion 32 are formed in a substantially L-shaped cross section (see FIG. 3C).

  The bottom surface portion 32 is a portion where the large ring O-ring 71 is disposed. The step (or depth) between the annular plate portion 1 and the bottom surface portion 32 of the circumferential step portion 3 is formed smaller than the ring diameter of the large ring O-ring 71. Specifically, the back surfaces 1b and 1b of the two yokes A1 and A1 face each other, and the large ring O-ring 71 is compressed in the shaft axial direction by the bottom surface portions 32 and 32 of the circumferential step portions 3 and 3. It is necessary to be about [see FIG. 1 (A), FIG. 8]. Further, the width dimension in the diameter direction of the bottom surface 32 is formed to be large to some extent so that the large ring O-ring 71 can be disposed with a margin.

  A junction 4 is formed along the circumferential direction on the back surface 1b of the yoke A1 and on the outer peripheral edge thereof. Further, specifically, the joint 4 is formed such that substantially mountain-shaped portions and substantially valley-shaped portions are alternately arranged at equal intervals along the circumferential direction on the outer peripheral edge of the bottom surface portion 32 of the circumferential step portion 3 of the yoke A1. Are formed continuously. The joints 4 and 4 of the two yokes A1 and A1 are fixed to the joint 4 of the mating yoke A1 by press-fitting means by the action of being wedged and fitted together. , A1 are joined together to form the central yoke body A. A large ring O-ring 71 is mounted inside the central yoke body A as will be described later.

  There are a plurality of such embodiments of the joint 4. As shown in FIGS. 3 and 4, the joint portion 4 according to the first embodiment includes a trapezoidal joint piece 41 and a fitting recess 42. The trapezoidal joining piece 41 is formed to rise as a substantially plate piece perpendicular to the outer peripheral edge of the yoke A1, that is, the outer peripheral edge of the bottom surface portion 32 of the circumferential step portion 3. The trapezoidal joining pieces 41 are formed at equal intervals along the circumferential direction on the outer peripheral edge of the bottom surface portion 32 of the circumferential step portion 3 (see FIGS. 3A and 4C). A fitting recess 42 is formed between the adjacent trapezoidal joining pieces 41, 41.

  As shown in FIGS. 4A and 4D, the trapezoidal joining piece 41 is formed at the center in the width direction of the substantially trapezoidal trapezoidal rising portion 411 and the top portion 411a of the trapezoidal rising portion 411. It is comprised from the fitting protrusion part 412. FIG. The trapezoidal rising portion 411 is formed as inclined sides 411b and 411b that gradually narrow in the width direction as both sides in the width direction go to the top portion 411a. The fitting protrusion 412 is formed in a substantially square shape such as a square or a rectangle. The fitting recessed portion 42 is a portion that is fitted and fixed when the fitting protrusion 412 is press-fitted.

  The shape of the space between the adjacent trapezoidal joining pieces 41, 41 of the joining portion 4 formed on the outer peripheral edge of the yoke A1 is equal to the shape in which the trapezoidal joining piece 41 is upside down. (See FIG. 4A). The trapezoidal joining piece 41 of the yoke A1 on the other side accurately and surely enters the adjacent trapezoidal joining pieces 41, 41, and the fitting protrusion 412 is positioned at the position of the fitting recess 42. And is press-fit. When the trapezoidal joining piece 41 of the other yoke A1 is inserted into the gap between the adjacent trapezoidal joining pieces 41 and 41 in one yoke A1, the inclined side 411b of the trapezoidal rising portion 411 is It has a function to guide the fitting projection 412 and the fitting recess 42 so that the positions thereof are aligned (see FIGS. 4D and 4E).

  That is, when combining the two yokes A1, A1, the inclined sides 411b, 411b of the trapezoidal joining piece 41 of the yokes A1, A1 are not aligned even if the yokes A1, A1 are slightly displaced in the circumferential direction. By moving to each other while abutting, the fitting protrusion 412 and the fitted recess 42 are naturally aligned, and the subsequent press-fitting process is facilitated. Furthermore, the trapezoidal joint piece 41 is connected in a gentle slope shape by the fact that the top portion 411a and the bottom surface portion 32 of the circumferential step portion 3 are continuous by the inclined sides 411b and 411b. Similarly, the molding shape of the joint 4 of the mold for manufacturing the yoke A1 is also a gentle slope, which has the advantage that the life of the mold is improved.

  The fitting protrusion 412 and the fitting recess 42 are press-fitted so that the width dimension of the fitting protrusion 412 is several tens of microns larger than the width dimension of the fitting depression 42. ing. This is a general press-fitting allowance. When the central yoke body A is configured by combining two yokes A 1 and A 1, the joint portion 4 becomes a wall surface portion in the outermost peripheral portion of the central yoke body A, and the large circular ring together with the circumferential step portion 3. This constitutes a storage chamber for the O-ring 71.

  Next, in 2nd Embodiment of the junction part 4, as shown in FIG. 5, the rectangular or square-shaped square fitting piece 43 is formed at equal intervals along the outer periphery of the said yoke A1, and adjoins the said A gap between the rectangular fitting pieces 43 and 43 is formed as a fitted gap 44. The joint portion 4 of the second embodiment is simple and has a substantially rectangular shape [see FIG. 5B], and thus the shape of the yoke A1 is also simple, and the manufacturing cost can be reduced.

  Next, in 3rd Embodiment of the junction part 4, as shown in FIG. 6, the junction part 4 of one yoke A1 which comprises the center yoke body A is substantially flat cylindrical shape in the outer periphery of the circumferential level | step-difference part 3. As shown in FIG. The outer cylindrical fitting portion 45 is formed. The joint 4 of the yoke A1 on the other side is formed with a flat cylindrical inner cylindrical fitting portion 46 at a position slightly inward from the outer peripheral edge of the circumferential step 3 [FIG. See A)]. The diameter of each of the inner cylindrical fitting portions 46 is determined so that the inner cylindrical fitting portion 46 can be press-fitted into the inner peripheral side of the outer cylindrical fitting portion 45 (see FIG. 6B). The joint portion 4 of the third embodiment is also a flat cylindrical shape and is simple, so the shape of the yoke A1 is also simple, and the manufacturing cost can be suppressed.

  In the joint portion 4 in the first and second embodiments, at least three trapezoidal joining pieces 41 or square fitting pieces 43 are formed with respect to the outer peripheral edge of the yoke A1. Since the trapezoidal joining piece 41 or the rectangular fitting piece 43 is formed at three or more positions on the outer peripheral edge of the yoke A1, the two yokes A1 and A1 can be press-fitted at coaxial positions. That is, the concentricity when the two yokes A1 and A1 are joined by the press-fitting means is increased by forming the trapezoidal joining piece 41 or the rectangular fitting piece 43 of the joining portion 4 at three or more places. In addition, the rows of comb teeth 2, 2,... Of both yokes A1, A1 can be arranged in a well-balanced manner to increase the magnetic efficiency. Further, the four yokes A1 having the joint portions 4 of the first and second embodiments can be made to have the same shape, and any two of them can be extracted from the four yokes A1, A1,. Even when combined, the central yoke body A can be formed.

  The bobbin 5 is made of a synthetic resin, and electrically insulates between the coil 54 wound around the bobbin 5 and the yoke. As shown in FIG. 7, the bobbin 5 includes a cylindrical portion 51 and two flanged plates 52 and 52, and the flanged plates 52 and 52 are integrally formed at both ends of the cylindrical portion 51 in the axial direction. The bobbin 5 has a coil 54 wound around the cylindrical portion 51 (see FIGS. 1A and 2). The cylindrical portion 51 has a tubular shape through which the inner periphery passes.

  As shown in FIG. 7A, the bowl-shaped plate 52 is formed as a circular plate, and a positioning groove 53 is formed on the outer surface side opposite to the side where the cylindrical portion 51 is provided. Yes. The positioning groove 53 is a part that serves to stabilize the mounting state of the small ring O-ring 72 by setting a position where a small ring O-ring 72 described later is mounted in a substantially fixed state. An electrical wiring terminal 55 is adjacent to either one of the two saddle-like plates 52. The electric wiring terminals 55 are energized in turn (alternate) to the coils 54 connected to the respective terminals by an external control circuit, whereby a magnetic field is generated in the coils 54 and the rotation direction of the valve driving shaft 9 is increased. The angle can be changed. The control circuit may be attached to the motor portion. Here, the large ring O ring 71 and the small ring O ring 72 are seal materials such as ordinary O rings, and the diameter of the ring of the large ring O ring 71 is larger than the diameter of the ring of the small ring O ring 72. Largely formed.

  Next, the configuration of the present invention will be described with reference to FIG. First, the back surfaces 1b and 1b of the two yokes A1 and A1 are opposed to each other (see FIGS. 2, 3A and 3B). The two yokes A1, A1 sandwich the large ring O-ring 71 between the circumferential stepped portions 3, 3 on the back surface, and the yokes A1, A1 are joined to each other via the joints 4, 4. Thus, the central yoke body A is configured. In the central yoke body A, the large ring O-ring 71 is press-fitted with a load smaller than the joining force (press-fit load) due to the press-fitting of the joints 4 and 4 of the two yokes A1 and A1. Yes. Moreover, since the elastic repulsion force by the rubber of the large ring O-ring 71 is a small value, the press-fit load may be low.

  The central yoke body A has a structure in which the central through hole 11a and the joints 4 and 4 on the outer peripheral edges of the yokes A1 and A1 are blocked by a large ring O-ring 71 mounted inside. On both surfaces 1a and 1a of the central yoke body A, a saddle plate 52 on one side of the bobbin 5 is disposed. .. Are inserted on the inner peripheral side of the cylindrical portion 51 of the bobbin 5 as a circumferential row of the yoke A1. Here, a small ring O-ring 72 is sandwiched between the surface 1 a of the central yoke body A and the bowl-shaped plate 52 on one side of the bobbin 5. When the positioning groove 53 is formed in the bowl-shaped plate 52 of the bobbin 5, the small ring O-ring 72 is disposed in the positioning groove 53. That is, the bobbins 5 and 5 are disposed on the upper and lower surfaces 1a and 1a of the central yoke body A, respectively.

  Further, the remaining two yokes A1 and A1 are disposed on the other flanges 52 and 52 on the other side of the bobbins 5 and 5, respectively. The small ring O-ring is sandwiched between the flange-like plate 52 on the other side of the bobbin 5 and the surface 1a of the yoke A1. Further, when the positioning groove 53 is formed in the flange-like plates 52, 52 on the other side of the bobbins 5, 5, the small ring O-ring 72 is disposed in the positioning groove 53. The comb teeth 2 formed as a circumferential row of both yokes A1 and A1 disposed on the other side of both bobbins 5 and 5 are inserted into the cylindrical portion 51 of both bobbins 5 and 5, and at this time, the central yoke body A The comb teeth 2, 2,...

  The yokes A1 and A1 disposed on the flanges 52 and 52 on the other side of both the bobbins 5 and 5 are the inner wall surface 100a of the casing main body portion 100 1 constituting the casing B and the inner wall surface 200a of the casing cover portion 200. It is comprised so that each may contact | abut. The large ring O-ring 71 is disposed between the bottom surface portion 32 of the circumferential step portion 3 of the yoke A 1 located on the upper side of the casing main body 100 and the inner wall surface 100 a of the casing main body 100. Similarly, the large ring O-ring 71 is also disposed between the bottom surface portion 32 of the circumferential step portion 3 of the yoke A1 located on the lower side of the casing main body 100 and the inner wall surface 200a of the casing cover portion 200. .

  With such a configuration, the cooling water (fluid) on the valve chamber 301 side that reaches the inner magnet 8 and the valve driving shaft 9 inside the casing B is supplied to the large ring O-ring 71 and the small ring O-ring 72. Thus, the coil 54 wound around the bobbins 5 and 5 can be blocked so as not to reach the coil 54 (see FIG. 8). Also, circumferential positioning shallow grooves 100b and 200b in which the small ring O-ring 72 is fitted are formed on the inner wall surface 100a of the casing body 100 of the casing B and the inner wall surface 200a of the casing cover 200. (See FIG. 9). The valve chamber 301 is formed inside the valve casing 300, and the rotary valve 400 is accommodated in the valve chamber 301. The valve chamber 301 has a flow path 302 through which a fluid such as cooling water flows in and out.

  The inner magnet 8 is formed of a permanent magnet, and a magnetic pole is formed in the circumferential direction. The magnetic field generated by the coil 54 wound around the cylindrical portion 51 of the bobbin 5 changes the angle in the rotation direction. A valve driving shaft 9 is fixed to the center of the inner magnet 8. The valve driving shaft 9 rotates together with the inner magnet 8. A worm gear 401 is formed or attached to the axial end of the valve driving shaft 9 and meshes with the worm wheel 402 (see FIG. 1B). A rotary valve 400 is provided at the tip of the worm wheel 402, and the rotary valve 400 changes the angle in the rotation direction and switches the flow path, whereby the flow to the radiator, the bypass flow path, and the heater core are changed. Vary the flow rate of each path.

DESCRIPTION OF SYMBOLS 1 ... Ring plate part, 11a ... Through-hole, 2 ... Comb tooth, 3 ... Circumferential level | step-difference part, A1 ... Yoke,
4 ... Junction part, A ... Central yoke body, 41 ... Trapezoidal joint piece, 411 ... Trapezoid rising part,
411a ... Top part, 412 ... Fitting projection part, 42 ... Fitted hollow part, 43 ... Rectangular fitting piece,
44 ... Fitted gap portion, 45 ... Outer cylindrical fitting portion, 46 ... Inner cylindrical fitting portion,
5 ... bobbin, 52 ... bowl-shaped plate, 53 ... positioning groove, 71 ... large ring O-ring,
72 ... Small ring O-ring, B ... Casing, 100 ... Casing body,
200 ... casing cover part, 100b, 200b ... positioning shallow groove.

Claims (6)

  Two bobbins in which saddle-shaped plates are formed on both ends in the axial direction of the cylindrical portion, comb teeth formed on the surface of the annular plate portion and at the periphery of the central through hole, and the back surface of the annular plate portion And a yoke composed of a circumferential step formed near the outer periphery and a joint formed along the outer periphery of the circumferential step, a large ring O-ring, a small ring O-ring, a casing, A central yoke body in which a large ring O-ring is sandwiched between circumferentially stepped portions of the two yokes and the yokes are joined to each other via the joint portion; The bobbin is disposed with a small ring O-ring sandwiched therebetween, and is disposed so that the small ring O-ring is sandwiched between the respective bowl-shaped plates of both bobbins. A large ring O-ring is attached to each of the parts and the casing is used for each. Waterproof structure of the flow control valve, wherein the macrocyclic O-ring disposed in a circumferential stepped portion of the yoke, characterized by comprising sandwiched.   2. The joint part of the central yoke body according to claim 1, comprising a trapezoidal rising part and a fitting protrusion formed at the center in the width direction of the top part of the trapezoidal rising part, along the outer peripheral edge of the yoke, etc. Waterproofing of a flow rate control valve, characterized by comprising trapezoidal joint pieces formed at intervals, and a fitting recess formed between the trapezoidal joint pieces and into which the fitting protrusions are press-fitted. Construction.   The joint portion of the central yoke body according to claim 1, wherein rectangular or square rectangular fitting pieces are formed at equal intervals along the outer peripheral edge of the yoke, and between the adjacent rectangular fitting pieces. A waterproof structure for a flow control valve, wherein the rectangular fitting piece is press-fitted into a gap to be fitted.   2. The joint portion of the central yoke body according to claim 1, wherein an outer cylindrical fitting portion is formed on an outer peripheral edge of a circumferential step portion on one yoke, and the outer cylindrical fitting portion is formed on the other yoke. A waterproof structure for a flow control valve, characterized in that an inner cylindrical fitting portion having a diameter capable of being press-fitted is formed on the inner peripheral side of the flow control valve.   5. The circumferential positioning groove into which the small ring O-ring is fitted is formed on the outer surface side of the both collars of the bobbin according to claim 1, 2, 3, or 4. Waterproof structure of flow control valve characterized by The casing according to any one of claims 1, 2, 3, 4 and 5, wherein the casing is provided with a casing body and a casing cover, and the large ring O-ring is provided on the casing body and the casing cover. A waterproof structure for a flow control valve, wherein a circumferential positioning shallow groove to be fitted is formed.

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