JP2015152093A - solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve in which its cost can be reduced by decreasing the number of component elements and the number of assembling steps.SOLUTION: An end part of a plunger 21 is cooperatively arranged with a first small diameter shaft part 21a and an end part of the first small diameter shaft part 21a is cooperatively arranged with a second small diameter shaft part 21b. A valve body 24 comprises a boss part 24a air-tight fitted to the second small diameter shaft part 21b, a seat part 24c set on a valve seat 10 and a thin-walled flexible part 24b connecting these boss part 24a and seat part 24c in such a manner that they can be inclined to each other. To the first small diameter shaft part 21a is freely fitted a spring seat plate 23 for supporting a movable end of a valve spring 28 by coming into contact with the valve body 24. To the end part of the second small diameter shaft part 21b is integrally arranged a flange 21c for holding the boss part 24a on the second small diameter shaft part 21b and the boss part 24a is applied with a diameter expanding resiliency enabling itself to ride over this flange 21c.

Description

  The present invention includes a valve body having a valve seat, a solenoid support body joined to the valve body, a valve body made of an elastic material seated on the valve seat, and the solenoid support body supporting the valve body. A plunger that is slidably supported, a valve spring that urges the valve body in a seating direction with the valve seat, and a solenoid support that is attached to the solenoid spring and resists the urging force of the valve spring when energized. A solenoid valve comprising a solenoid that operates the plunger to the fully open side of the valve body, and a first small-diameter shaft portion connected to an end portion of the plunger on the valve seat side via a first annular step portion; A second small-diameter shaft portion connected to the end portion of the first small-diameter shaft portion via a second annular step portion is connected to the valve body, and the valve body is fitted and held in an airtight manner to the second small-diameter shaft portion. A boss portion, a seat portion surrounding the boss portion and seated on the valve seat, and the boss portions And a boss portion and a flexible portion that is thinner than the seating portion, so that the seating portion is tiltably connected to each other, and the first small-diameter shaft portion is in contact with the boss portion and the seating portion, and the valve The present invention relates to an improvement in a structure in which a mounting hole of a spring seat plate supporting a movable end portion of a spring is loosely fitted so that the spring seat plate can be tilted with respect to the first small-diameter shaft portion.

  Such a solenoid valve has already been proposed by the present applicant as disclosed in Patent Document 1 below.

JP 2012-21562 A

  In the solenoid valve disclosed in Patent Document 1, even if the parallel accuracy of the opposing surfaces of the valve body and the valve seat is deviated due to manufacturing errors of each part, the mutual tilt between the boss part and the seating part of the valve body and the spring Due to the mutual tilting between the seat plate and the first small-diameter shaft portion, the seat portion can be reliably seated on the valve seat with the load of the valve spring, and a good valve closing state can be ensured. The boss of the valve body is simply airtightly fitted and held on the second small-diameter shaft of the plunger, so no special sealing member is required between the valve body and the plunger, and the structure can be simplified. Can do.

  However, in order to hold the boss portion of the valve body on the second small diameter shaft portion, the third small diameter shaft portion connected to the end of the second small diameter shaft portion and having a smaller diameter than the second small diameter shaft portion, Since the holding member that supports the boss portion is press-fitted, the number of parts and the number of assembly steps are increased, making it difficult to reduce the cost.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide the solenoid valve that can reduce the number of parts and the number of assembling steps to reduce the cost.

  In order to achieve the above object, the present invention provides a valve body having a valve seat, a solenoid support body joined to the valve body, a valve body made of an elastic material seated on the valve seat, and the valve body. A plunger that is slidably supported by the solenoid support, a valve spring that urges the valve body in a seating direction with the valve seat, and a valve spring that is attached to the solenoid support and is energized. An electromagnetic valve comprising a solenoid that operates the plunger toward the fully open side of the valve body against a biasing force of a spring, and is connected to an end of the plunger on the valve seat side via a first annular step. A first small-diameter shaft portion and a second small-diameter shaft portion connected to the end of the first small-diameter shaft portion via a second annular stepped portion are connected to each other, and the valve body is connected to the second small-diameter shaft portion. A boss part that is airtightly fitted and held, and surrounding the boss part, is attached to the valve seat. And a boss portion and a flexible portion that is thinner than the seat portion. The boss portion and the seat portion are connected to each other so as to be tiltable. A spring seat plate mounting hole that abuts the seat portion and supports the movable end of the valve spring is loosely fitted so that the spring seat plate can tilt with respect to the first small-diameter shaft portion. A flange for holding the boss portion on the second small-diameter shaft portion, which is larger in diameter than the second small-diameter shaft portion and smaller in diameter than the mounting hole, is integrally connected to the end portion of the second small-diameter shaft portion. The first feature is that the boss portion is provided with a diameter expansion elasticity capable of overcoming the flange.

  In addition to the first feature, the present invention sets the outer diameter of the flange to be smaller than the diameter of the thinnest part of the flexible part, and the thickness of the thinnest part of the flexible part, The second feature is that the thickness is set to be 1/2 or more of the thickness of the boss portion.

  Furthermore, in addition to the first or second feature, the present invention provides a tapered shaft portion that induces an expansion of the boss portion when the boss portion is fitted to the second small diameter shaft portion at the end of the flange. The third feature is that the two are integrally connected.

  According to the first feature of the present invention, a flange having a larger diameter than that of the second small-diameter shaft portion is integrally connected to the end portion of the second small-diameter shaft portion, and the flange is simply passed over the boss portion of the valve body. Thus, the boss portion can be easily held on the second small-diameter shaft portion without using a special holding member, and the number of parts and the number of assembly steps can be reduced, which can contribute to cost reduction. In addition, since the flange has a smaller diameter than the mounting hole of the spring seat plate, the spring seat plate can be mounted on the second small-diameter shaft portion without interfering with the flange, while making the spring seat plate an unbroken annular body. Therefore, the spring seat plate can receive the urging force of the valve spring in a well-balanced manner so that the valve body can be stably seated on the valve seat.

  According to the second feature of the present invention, the outer diameter of the flange is set smaller than the diameter of the thinnest part of the flexible part of the valve body, so that the diameter of the boss part when the boss part gets over the flange is increased. The deformation can be performed smoothly and the boss portion can be prevented from being damaged due to excessive diameter expansion. In addition, by setting the thickness of the thinnest part of the flexible part to be 1/2 or more of the thickness of the boss part, the flexible part is given appropriate rigidity, and the elastic part has an excessive elastic restoring force. Can be prevented, and the valve opening delay of the seating part can be prevented as much as possible.

  According to the third feature of the present invention, the diameter of the boss portion of the valve body is increased along the tapered shaft portion, the flange is easily climbed over the boss portion, and the boss portion is easily placed on the second small diameter shaft portion. It can be set and assembly can be improved.

The longitudinal cross-sectional view of the solenoid valve which concerns on embodiment of this invention. FIG. 2 is an enlarged view of part 2 of FIG. 1. Action explanatory drawing corresponding to FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  First, in FIG. 1, a throttle body T attached to an engine (not shown) has an intake passage 1 connected to an intake port of the engine, and is a butterfly type that opens and closes the intake passage 1 to control the amount of intake passage of the engine. The throttle valve 2 is pivotally supported on the throttle body T. A bypass 3 that bypasses the throttle body T and communicates between the upstream and downstream portions of the intake passage 1 is connected to the throttle body T, and the solenoid valve V of the present invention is interposed in the middle of the bypass 3. This electromagnetic valve V is a normally closed type, and the bypass 3 can be conducted by opening the valve.

  The electromagnetic valve V will be described in detail with reference to FIGS.

  The electromagnetic valve V includes a valve body 5 supported by the throttle body T or the engine, and a solenoid support body 6 joined thereto by a bolt 7. In order to define the joint position between the valve body 5 and the solenoid support 6, a positioning cylinder portion 9 protruding from the bottom surface of the solenoid support 6 is fitted in a circular recess 8 formed on the top surface of the valve body 5. The sealing member 22 is interposed in the fitting portion.

  Further, the valve body 5 is formed with a valve seat 10 that is annularly raised from the center of the bottom surface of the circular recess 8, and the inlet hole 11 that opens to the bottom surface of the circular recess 8 outside the valve seat 10 has the above-mentioned An upstream portion 3 a of the bypass 3 is connected, and a downstream portion 3 b of the bypass 3 is connected to the valve hole 12 in the valve seat 10.

  The solenoid support 6 is made of synthetic resin. The solenoid support 6 includes a bobbin 13, a solenoid 14 wound around the bobbin 13, a yoke 15 that surrounds the outer periphery of the solenoid 14, and bends at both the upper and lower ends of the bobbin 13. A cylindrical fixed core 16 that is fitted into the hollow portion of the yoke 15 and is caulked and joined integrally to the upper end plate 15a of the yoke 15, and a power supply terminal 17 connected to the solenoid 14 are embedded. It is arranged so that the tip portion faces the coupler 18 that is integrally projected on the upper side surface of the support 6.

  The lower end plate 15b of the yoke 15 is provided with a through hole 19 having the same diameter as or slightly larger than that of the hollow portion of the bobbin 13, and a valve spring positioning having a larger diameter connected to the through hole 19 is provided. A hole 20 is provided at the center of the positioning tube portion 9. The bobbin 13, the through hole 19, the valve valve spring positioning hole 20, and the valve seat 10 are disposed on the same axis.

  A plunger 21 as a movable core that penetrates the through hole 19 and faces the lower end surface of the fixed core 16 is slidably fitted to the lower portion of the hollow portion of the bobbin 13. The lower end portion of the plunger 21 protrudes below the positioning cylinder portion 9, and a first small diameter shaft portion 21 a connected via a first annular step portion 21 a ′ is connected to the lower end portion of the plunger 21, and the first small diameter shaft portion. A second small-diameter shaft portion 21b connected to the end portion of 21a through a second annular step portion 21b 'is provided, and a flange having a diameter larger than that of the second small-diameter shaft portion 21b is provided at the end portion of the second small-diameter shaft portion 21b. 21c, a tapered taper portion 21d at the end of the flange 21c, and a guide shaft 21e having a diameter smaller than that of the second small-diameter shaft portion 21b at the end of the taper shaft portion 21d. The second small-diameter shaft portion 21b is set to be longer than the axial lengths of the first small-diameter shaft portion 21a and the flange 21c.

  An attachment hole 23a of a disc-shaped spring seat plate 23 is loosely fitted from the valve seat 10 to the first small diameter shaft portion 21a. Thus, the mounting hole 23a of the spring seat plate 23 is formed to have a larger diameter than the first small diameter shaft portion 21a, and the plate thickness of the spring seat plate 23 is made thinner than the length of the first small diameter shaft portion 21a. The seat plate 23 can tilt with respect to the first small-diameter shaft portion 21a. The flange 21c is formed to have a smaller diameter than the mounting hole 23a so as to allow passage through the mounting hole 23a.

  A disc-shaped valve body 24 whose front surface is seated on the valve seat 10 is fitted to the second small diameter shaft portion 21b in an airtight manner.

  The valve body 24 is made of an elastic material such as rubber. By forming an annular groove 26 on the back surface of the valve body 24, a thin and annular flexible portion 24 b is formed on the front surface side of the valve body 24. Thus, the valve body 24 includes a boss portion 24a that is airtightly fitted to the second small-diameter shaft portion 21b, a seat portion 24c that surrounds the boss portion 24a and is seated on the valve seat 10, and the boss portion 24a and the seat portion 24c. And an annular flexible portion 24b for connecting the two. The boss portion 24a and the seating portion 24c can tilt with respect to each other due to the bending of the flexible portion 24b. The boss portion 24a is provided with a diameter expansion elasticity that can overcome the flange 21c.

  Here, the outer diameter of the flange 21c is D1, the diameter of the minimum thickness portion of the flexible portion 24b is D2, the thickness of the boss portion 24a is T2, and the minimum thickness of the flexible portion 24b is H1. Then, the following formula is established.

D1 <D2 (1)
H1 ≧ H2 / 2 (2)
Between the solenoid support 6 and the spring seat plate 23, a valve spring 28 for urging the valve body 24 in the seating direction on the valve seat 10 is contracted, and when the valve body 24 is seated on the valve seat 10, A fixed gap g corresponding to the valve opening stroke of the valve body 24 is provided between the fixed core 16 and the plunger 21.

  The valve spring 28 is a single valve spring having a conical coil portion 29 and a cylindrical coil portion 30 extending from the small diameter end 29b of the conical coil portion 29 with the same diameter as the conical coil portion 29. The portion 29 is arranged so that the large-diameter end 29 a is fitted to the inner peripheral surface of the valve spring positioning hole 20 and is supported on the lower end plate 15 b of the yoke 15, and the cylindrical coil portion 30 is arranged on the outer periphery of the plunger 21. Are arranged concentrically with each other and a lower end thereof is brought into contact with the spring seat plate 23.

  In order to enable the spring seat plate 23 to tilt with respect to the first small-diameter shaft portion 21a, the mounting hole 23a of the spring seat plate 23 is formed with a larger diameter than the first small-diameter shaft portion 21a, and The plate thickness is thinner than the length of the first small-diameter shaft portion 21a.

  Thus, the valve spring 28 comprising the conical coil portion 29 and the cylindrical coil portion 30 is made of a single wire having a uniform wire diameter, and the valve spring constant of the cylindrical coil portion 30 is determined by the conical coil. It is set larger than that of the section 29. Further, the conical coil portion 29 having a low valve spring constant is compressed and deformed into a single flat shape in the middle of opening of the valve body 24 so as to be in close contact with the lower end plate of the yoke 15.

  Next, the operation of this embodiment will be described.

  In attaching the valve body 24 to the second small diameter shaft portion 21b, first, the valve valve spring 28 is disposed around the plunger 21, and the spring seat plate 23 is disposed around the first small diameter shaft portion 21a. After that, after inserting the guide shaft 21e into the hollow portion of the boss portion 24a of the valve body 24 and then expanding the diameter of the boss portion 24a along the taper shaft portion 21d so as to get over the flange 21c, the boss portion 24a The shrinkage restoring force of the second member closes and fits to the outer peripheral surface of the second small-diameter shaft portion 21b, and the axial movement is restricted by the flange 21c, thereby holding the boss portion 24a on the second small-diameter shaft portion 21b. In addition, a seal between the second small diameter shaft portion 21b and the boss portion 24a can be secured without using a special seal member.

  In this way, a special holding can be achieved by simply connecting the flange 21c larger in diameter than the second small diameter shaft portion 21b integrally to the end of the second small diameter shaft portion 21b and overriding the flange 21c on the boss portion 24a. The boss portion 24a can be easily and reliably held on the second small-diameter shaft portion 21b without using a member, and the number of parts and the number of assembling steps can be reduced, thereby contributing to cost reduction.

  In addition, since the flange 21c has a smaller diameter than the mounting hole 23a of the spring seat plate 23, the spring seat plate 23 is formed into an unbroken annular body, and is not interfered with the flange 21c. Therefore, the spring seat plate 23 can receive the urging force of the valve spring 28 in a well-balanced manner, and can stably seat the valve body 24 on the valve seat 10.

  Moreover, since the outer diameter D1 of the expression (1), that is, the outer diameter D1 of the flange 21c is set smaller than the diameter D2 of the thinnest portion of the flexible portion 24b of the valve body 24, the boss when the boss portion 24a gets over the flange 21c. The diameter expansion deformation of the portion 24a can be performed smoothly, and damage due to excessive diameter expansion of the boss portion 24a can be prevented.

  Thus, when the engine is warmed up, the solenoid 21 is energized to attract the plunger 21 to the fixed core 16 against the urging force of the valve spring 28, causing the valve body 24 to separate from the valve seat 10. In this way, since the upstream portion 3a and the downstream portion 3b of the bypass 3 are made conductive, the intake air for the first idling can be supplied to the engine through the bypass 3. After the warm-up operation is completed, the solenoid 21 is energized and the plunger 21 is in a fully closed state (see FIG. 2) in which the valve body 24 is seated on the valve seat 10 by the urging force of the valve spring 28. Since the upstream portion 3a and the downstream portion 3b are blocked, normal intake air for idling can be supplied to the engine through the throttle valve 2 around the idle opening.

  By the way, if the parallel accuracy of the opposing surfaces of the valve body 24 and the valve seat 10 is out of order due to manufacturing errors including processing errors and assembly errors of each part, the valve body 24 tilts toward the valve seat 10 when fully closed. However, the valve body 24 is seated and the valve body 24 is hermetically fitted and fixed to the second small-diameter shaft portion 21b of the plunger 21, and the boss portion 24a. It is composed of a seating portion 24c that surrounds and seats on the valve seat 10, and a flexible portion 24b that connects the boss portion 24a and the seating portion 24c so that they can tilt relative to each other. Since the spring seat plate 23 that supports the movable end of the spring 28 can tilt on the first small-diameter shaft portion 21a of the plunger 21, the parallel accuracy of the opposing surfaces of the valve body 24 and the valve seat 10 is incorrect. Is caused by deformation of the flexible portion 24b as shown in FIG. The seat 24c is securely seated on the valve seat 10 with the load of the valve spring 28 by the mutual tilt between the seat portion 24a and the seat portion 24c and the mutual tilt between the spring seat plate 23 and the first small diameter shaft portion 21a. And a good valve closing state can be secured.

  By the way, when the elastic restoring force of the flexible portion 24b is excessively small, even when the solenoid 14 is energized to attract the plunger 21 to the fixed core 16 and open the valve body 24, the seating is performed. Although the valve opening of the seating portion 24c is delayed due to the adhesive force of the portion 24c with the valve seat 10 and the elastic deformation of the flexible portion 24b, the equation (2), that is, the thinnest portion of the flexible portion 24b By setting the wall thickness T1 to be 1/2 or more of the wall thickness T2 of the boss portion 24a, an appropriate rigidity is given to the flexible portion 24b, and an excessive decrease in the elastic restoring force of the flexible portion 24b is suppressed. Thus, the valve opening delay of the seating portion 24c can be prevented as much as possible.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the valve body 24 can be disposed with the annular groove 26 facing the valve seat side. Moreover, the valve body 24 can also be comprised by connecting the different raw material corresponding to each function of the boss | hub part 24a, the flexible part 24b, and the seating part 24c.

V ... Solenoid valve 5 ... Valve body 6 ... Solenoid support 10 ... Valve seat 14 ... Solenoid 21 ... Plungers 21a, 21b ... First and second small diameters Shaft portion 21a ', 21b' ... 1st and 2nd annular stepped portion 21c ... Flange 21d ... Tapered shaft portion 23 ... Spring seat plate 23a ... Mounting hole 24 ... Valve body 24a ... Portion 24b ··· flexible portion 24c · · seating portion 28 ··· valve spring

Claims (3)

A valve body (5) having a valve seat (10), a solenoid support (6) joined to the valve body (5), and a valve body (24) made of an elastic material seated on the valve seat (10) And a plunger (21) that supports the valve body (24) and is slidably supported by the solenoid support body (6), and a seating direction of the valve body (24) with the valve seat (10). A valve spring (28) for urging the valve spring and attached to the solenoid support (6), and when energized, the plunger (21) is moved against the urging force of the valve spring (28). A solenoid valve (14) that is actuated to the fully open side of the plunger (21), and is connected to the end of the plunger (21) on the valve seat (10) side via a first annular step (21a '). One small diameter shaft portion (21a) and a second annular step portion at the end of the first small diameter shaft portion (21a) 21b ') are connected to the second small diameter shaft portion (21b), and the valve body (24) is hermetically fitted to and held by the second small diameter shaft portion (21b). 24a), a seat portion (24c) surrounding the boss portion (24a) and seated on the valve seat (10), and the boss portion (24a) and the seat portion (24c) are connected to each other so as to be tiltable. , The boss part (24a) and the flexible part (24b) thinner than the seating part (24c), and the first small diameter shaft part (21a) includes the boss part (24a) and the seating part (24c). ) And the mounting hole (23a) of the spring seat plate (23) supporting the movable end portion of the valve spring (28) is loosely fitted, and the spring seat plate (23) is inserted into the first small diameter shaft portion. (21a) can be tilted with respect to
At the end of the second small diameter shaft portion (21b), the diameter is larger than that of the second small diameter shaft portion (21b) and smaller than the mounting hole (23a). A solenoid valve characterized in that a flange (21c) for holding a boss portion (24a) is integrally connected, and the boss portion (24a) is provided with a diameter expansion elasticity capable of overcoming the flange (21c). The solenoid valve according to claim 1,
The outer diameter (D1) of the flange (21c) is set smaller than the diameter (D2) of the thinnest part of the flexible part (24b) and the thickness of the thinnest part of the flexible part (24b) (T1) is set to 1/2 or more of the thickness (T2) of the boss portion (24a). The solenoid valve according to claim 1 or 2,
When the boss portion (24a) is fitted to the second small diameter shaft portion (21b) at the end of the flange (21c), a tapered shaft portion (21d) that guides the diameter of the boss portion (24a) is provided. A solenoid valve characterized by being integrally connected.

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