JP2001227668A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce collision sound when opening a valve and closing the valve without being influenced by the hardness of an elastic member (a valve plate) provided at the abutting part of a valve element when opening the valve. SOLUTION: An O-ring 5 is fitted to the outer periphery of a rod 10 constituted the valve element 3. A first regulating part 13c and a second regulating part 6b are provided for regulating the axial motion of the O-ring 5, and the relation between a clearance dimension L2 between the O-ring 5 and the first regulating part 13c in the open state of the valve, and a clearance dimension L1 between a valve seat 2e and the valve plate 9 constituting the valve element 3 is set to L2>L1. The O-ring 5 therefore abuts on the respective regulating parts 13c, 6b before the valve is closed and before the opening of the valve is completed, so that the valve element 3 is reduced in speed and buffered by the frictional force of the O-ring 5 to the rod 10 to gently abut on the valve seat 2e and the elastic member 18. Collision sound when opening and closing the valve is therefore reduced remarkably with one O-ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for opening and closing a fluid passage, and more particularly, to a solenoid valve capable of reducing a collision sound when the valve is opened and closed.

[0002]

2. Description of the Related Art A solenoid valve used for opening and closing a fluid passage has a
Japanese Patent Laid-Open Publication No. Sho 57-117474 and Japanese Patent Laid-Open Publication No. Hei 7-22496 disclose a configuration for reducing the collision noise when the valve is opened and closed.
It is publicly known in Japanese Patent Publication No. 2 and the like. According to the above publication, the valve element is provided with an elastic member on the valve seat contact side of the valve element when the valve element is seated and on the stopper contact side of the valve element when the valve element is unseated. It is said that the collision sound when colliding with the seat and the stopper is reduced.

[0003]

However, the elastic member provided on the valve seat contact side is required to have a predetermined hardness in terms of both reducing the collision sound of the valve at the time of closing the valve and ensuring durability.
If this hardness is ensured high, it may not be enough to reduce the collision sound. In other words, it is more effective to lower the hardness to reduce the impact noise, it is more effective to increase the hardness to ensure durability, and the selection range of the hardness is to satisfy both. This is because there is a limited case, and if priority is given to ensuring durability, it may be insufficient to reduce the collision sound. Further, when the elastic member provided at a position where the valve body comes into contact with the valve when the valve is opened has a predetermined hardness or more, it may not be sufficient to reduce the collision sound, and the valve body comes into contact with the valve when the valve is closed and when the valve is opened. Different measures had to be taken for each location. Therefore, the present invention reduces the collision sound at the time of valve closing without being affected by the hardness of the elastic member provided at the contact portion of the valve body at the time of valve closing, and simultaneously reduces the collision sound at the time of valve opening. Make it an issue.

[0004]

According to a first aspect of the present invention, there is provided an electromagnetic valve which opens and closes a fluid passage when an electromagnetically driven valve body contacts and separates from a valve seat. An elastic ring fitted on the outer periphery of a rod constituting the valve body and movable integrally with the rod by frictional force; first and second restricting members for restricting axial movement of the elastic ring from both sides; The relationship between the gap dimension L2 between the elastic ring and the first restricting section when the valve is opened and the gap dimension L1 between the valve plate and the valve seat constituting the valve element is expressed by L2 <
L1. The invention of claim 2 is characterized in that an elastic member made of foamed rubber is provided at a position where the valve body contacts when fully opened.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a solenoid valve according to one embodiment of the present invention. In FIG. 1, a solenoid valve 1 supplies a resin passage housing 2 constituting a passage portion 1a and a valve portion 1b, an electromagnetic actuator portion 1c for driving a valve body 3 constituting a valve portion 1b, and a power supply. And a resin coil housing 4 formed by secondary molding. The passage housing 2 is provided with a fluid inlet 2a and a fluid outlet 2b, and a valve portion 1b is formed in a passage 2c between the two, and the passage 2c is opened and closed by electromagnetic driving. The inlet 2a goes to the atmosphere,
The outlet 2b is configured to be connected to each passage of the internal combustion engine, for example, a canister or an intake passage (both not shown). The valve portion 1b extends on the extension of the inner wall of the inflow port 2a.
Is integrally or integrally formed with the passage housing 2.

The valve element 3 constituting the valve section 1b is fitted with a projection 7a of a holder 7 and fixed with a stopper 8, and has a hardness of 70.
Valve plate 9 made of rubber elastic member of 70 ° (70 IRHD)
And a plunger 11 pressed at the lower end of the rod 10 by a spring 19, the rod 10 being loosely fitted to the holder 7, and the rod 10 is a slide provided at the center of a stator 13 caulked to the plate 12. Hole 13a
It is configured to be able to move inside. A rubber O-ring 5, which is an elastic ring, is fitted around the outer periphery of the rod 10,
It is configured to move integrally with the rod 10 by frictional force. A regulating hole 13b is formed concentrically with the sliding hole 13a so as to accommodate the O-ring 5 in the stator 13, and the bottom of the regulating hole 13b forms a first regulating portion 13c. A stopper 6 having a sliding hole 6a for accommodating the O-ring 5 and allowing the rod 10 to be loosely fitted therein is press-fitted into the opening of the regulating hole 13c to form a second regulating portion 6b to form the first regulating portion 13c.
Thus, the movement of the O-ring 5 is restricted from both sides. The inner diameter of the restriction hole 13b is
The O-ring 5 is formed so as not to hinder the movement of the O-ring 5. Clearance L between O-ring 5 and first restricting portion 13c when valve body 3 is opened
2 and the gap dimension L1 between the valve plate 9 and the valve seat 2e is L
It is configured such that 2 <L1.

The valve element 3 is urged by a spring 19 in the valve opening direction. The plate 12 is held together with the bobbin 14 by the coil housing 4 and the passage housing 2. A coil 15 is wound around the bobbin 14
Is connected to the terminal 16 of the connector section 1d (not shown), and the other end is grounded (not shown) and is energized. A metal yoke 17 is provided below the bobbin 14, and forms a closed magnetic path together with the metal stator 13 and the plate 12. An elastic member 18 is provided between the plunger 11 and the bobbin 14 so that the plunger 11 contacts when the valve body 3 is fully opened. Elastic member 18
Is fitted and fixed to a protrusion 14 a provided on the bobbin 14. The elastic member 18 is formed of foam rubber having a hardness lower than that of general rubber and a hardness of less than 40 °.

Next, the operation of the present embodiment will be described with reference to FIG. When electricity is supplied to the coil 15 through the terminal 16, the plate 12, the stator 13, the plunger 1
1, the yoke 17 forms a closed magnetic path, and the plunger 11 is lifted upward, so that the valve body 3 including the rubber valve plate 9 having a hardness of 70 ° moves upward against the spring 19 and moves to the valve seat 2e. To close the passage 2c.
At this time, since L2 <L1, the O-ring 5 abuts on the first restricting portion 13c before the valve plate 9 collides with the valve seat 2e, and only the rod 10 moves upward. , The valve body 3 is decelerated and buffered by the frictional force caused by the fitting between the O-ring 5 and the rod 10 and gently comes into contact with the valve seat 2e. It is sufficiently reduced without reducing the degree of freedom in design. That is, even when the hardness of the valve plate 9 is high, the collision noise at the time of closing the valve is reduced.

If the hardness of the valve plate 9 is low, when the valve is closed, the valve body 3 is decelerated and buffered by the frictional force that continuously exists on the rod 10 of the O-ring 5.
And the collision noise is sufficiently reduced without lowering the durability of the rubber valve plate 9.
When the energization stops and the valve body 3 is pushed by the spring 19 and leaves the valve seat 2e, the valve body 3 moves downward by the pressing force of the spring 19, and the O-ring 5 comes into contact with the second regulating portion 6b, O-ring 5 and rod 10 are operated in the same manner as when the valve is closed.
The plunger 11 collides with the elastic member 18 after the valve body 3 is decelerated and buffered by the frictional force due to the engagement with the plunger. The collision sound of the plunger 11 is reduced by the frictional force of the O-ring 5, but since the elastic member 18 is formed of foamed rubber having a hardness of less than 40 °, the valve body 3 is flexibly received, and when the valve is opened. Collision noise is reduced. According to the above specification, the collision noise when opening and closing the valve is reduced by about 10 dB.

[0010]

The present invention has the following effects because it is configured as described above. That is, according to the first aspect of the present invention, the elastic ring fitted to the outer periphery of the rod constituting the valve body and movable integrally with the rod by frictional force, and restricts the axial movement of the elastic ring from both sides. First and second regulating portions are provided, and the elastic ring and the first
The relationship between the gap L2 between the valve and the regulating portion and the gap L1 between the valve plate and the valve seat is L2 <L1, so that the elastic rings come into contact with the respective regulating portions before the valve is closed and before the valve is opened. Therefore, the valve body is decelerated and buffered by the frictional force of the elastic ring against the rod, and gently comes into contact with the valve seat and the elastic member, so that the collision sound at the time of opening and closing the valve is significantly reduced. That is,
With one elastic ring, both collision sounds at the time of opening and closing the valve can be reduced, which is economical. According to the second aspect of the present invention, the hardness of the valve body is set at 40 ° where the valve body contacts when the valve is opened.
Since the elastic member made of foamed rubber is provided, the collision member absorbs collision energy at the time of collision and acts to flexibly receive the valve body, so that the collision sound at the time of valve opening is further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2e Valve seat 3 Valve 5 O-ring 6b 2nd restricting part 9 Valve plate 10 Rod 13c 1st restricting part 18 Elastic member

Claims (2)

[Claims] An electromagnetic valve that opens and closes a fluid passage when an electromagnetically driven valve element contacts and separates from a valve seat. The electromagnetic valve is fitted on the outer periphery of a rod that constitutes the valve element, and the rod is formed by frictional force. An elastic ring integrally movable with the first and second restricting portions for restricting axial movement of the elastic ring from both sides, and a gap between the elastic ring and the first restricting portion when the valve is opened. An electromagnetic valve, wherein a relationship between a dimension L2 and a gap dimension L1 between a valve plate and a valve seat constituting the valve body is L2 <L1. 2. An elastic member made of foamed rubber is provided at a position where the valve body contacts when fully opened.
The described solenoid valve.