JPH0616170Y2 - Solenoid valve structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of a two-way valve solenoid valve for oil used in an automatic transmission for automobiles.

(Prior Art) As a two-way solenoid valve for oil used in an automatic transmission for automobiles, there is one as shown in FIG. Explaining the assembling direction of such an electromagnetic valve, first, the wave washer 11 is placed on the flange 2a of the sheet member 2 having the oil inlet 1, and the bobbin 4 around which the coil 5 is wound is placed thereon. Next, the plunger guide 6 is inserted inside the bobbin 4, and the plunger 7 is housed inside the plunger guide 6.

Next, the plate 9 is pushed so that its outer diameter portion 9a fits into the step portion 3a provided on the cover 3 and its inner diameter fits into the outer diameter of the plunger guide 6, whereby the bobbin 4
After positioning the one end side of the plunger guide 6 protruding from above, the cover plate 10 is placed thereon.

Next, the cover plate 10 is pressed against the flange 2a against the elastic force of the wave washer 11, and the bobbin 4 is fitted to the projecting portion 2b of the sheet member 2 so that the lower end side of the bobbin 4, that is, the other end of the plunger guide. The side is positioned, and the edge 3b of the cover 3 is caulked and fixed in that state.

To explain the operation, when the coil 5 is not energized,
The plunger 7 is lifted up by the oil pressure ejected from the oil inflow port 1, abuts on the cover plate 10, and
The oil inlet 1 is open. Therefore, as shown by the arrow, the oil is a drain hole 10a opened from the oil inlet 1 to the oil groove 7b provided in the plunger 7 and the cover plate 10.
It is drained to the outside through.

On the other hand, when the coil 5 is energized via the lead wire 8, a magnetic attraction force is exerted between the seat member 2 and the plunger 7, the plunger 7 is attracted to the seat member 2 side, and the valve portion 7a moves through the oil inlet 1. Since the oil pressure on the valve body B side rises due to the blockage, at this time, as described above, one end side of the plunger guide 6 is positioned by the plate 9, and the other end side of the plunger guide projects from the lower end side of the bobbin 4 and the seat member 2. Since the positioning is performed by fitting with the portion 2a, the plunger 7 is not inclined with respect to the oil inlet 1, and the valve portion 7a can close the oil inlet 1 without a gap. Therefore, leakage of oil from the oil inlet 1 to the drain side can be prevented, and the hydraulic pressure on the valve body B side can be accurately controlled.

(Problems to be solved by the invention) However, in the solenoid valve structure as described above, the plate 9 is formed separately from other components, which increases the number of solenoid valve parts and the number of assembly steps. It is a factor. On the other hand, since the plate 9 is indispensable for positioning the one end side of the plunger guide 6, its use is unavoidable. As a result, there is a problem that it is an obstacle to cost reduction.

(Means for Solving Problems) The present invention has been made to solve the above problems, and includes a sheet member having an oil inlet and an integrally molded member or an integral member. A cover fixed to the bobbin, a bobbin housed and fixed inside the cover, and wound with a coil, a plunger guide fixed to the inside of the bobbin and projecting at one end side from the bobbin, and inside the plunger guide. A plunger that is slidably accommodated in and has an oil passage in the axial direction, and that is fixed to the cover and restricts the stroke of the plunger at one end side of the bobbin, and the oil that has flowed into the oil passage is exposed to the outside. In a solenoid valve of a type including a cover plate having a drain hole for causing the flow out, the cover plate is provided with a flat portion and a radial direction from the flat portion to an axial center. A plurality of tongue-shaped projections that extend toward the one end side of the plunger guide and are used to position and fix the plunger guide, rise from the flat portion adjacent to the tongue-shaped projections, and are parallel to the flat portion. And in the radial direction, extending toward the axial center, the tip of which forms the drain hole, and the lower surface of which is integrally formed with a plurality of rising portions used as stopper surfaces that regulate the stroke of the plunger. It is characterized by having been made.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1 which is a plan view, FIG. 2 which is a side sectional view, FIG. 3 which is a perspective view of a plunger and FIG. 4 which is a perspective view of a cover plate. explain. The same members as those in FIG. 6 are designated by the same reference numerals.

Reference numeral 2 denotes a seat member having an insertion portion 1a into the valve body B and a flange 2b integral with the insertion portion 1a, and an oil inlet 1 is provided at the axial center of the insertion portion 1a. 3 is a cover integrally molded with the sheet member 2 or fixed integrally with the sheet member 2, 4 is a bobbin which is inserted and fixed inside the cover 3, and has a coil 5 wound around it, and 6 is a bobbin 4 It is a plunger guide inserted and fixed inside the. Plunger guide 6
Plunger 7 as shown in FIG. A valve portion 7a is provided at the tip of the plunger, and four oil grooves 7b are provided in the axial direction.
However, the number of grooves is not limited to four. Reference numeral 8 is a lead wire to which both ends of the coil winding are respectively connected, and extends to the outside and is connected to the power source side and the ground side via a switch or the like not shown.

Reference numeral 11 is a wave washer inserted between the flange 2a and the bobbin 4, and 12 is an O-ring provided outside the insertion portion 1a of the seat member 2 into the valve body.

20 is a cover plate formed by press molding, for example,
As shown in the figure, the plate-shaped flat portion 20a and the flat portion 2
0a in the radial direction, the plurality of tongue-shaped projections 20b extending toward the axis, and the flat portion 20 adjacent to the tongue-shaped projections.
A rising portion 20c that once rises from a and then extends in the radial direction in parallel with the flat portion 20a in the radial direction.
And have. The tip 20d of the tongue-shaped projection 20b is used for positioning and fixing one end of the plunger guide 6 projecting from the bobbin 4, and the tip 20d of the rising portion 20c.
e forms the drain hole 20g, and the lower surface 2 of the rising portion 20c
0f is used as a stopper surface for regulating the stroke of the plunger 7.

To describe the assembling method, first, the wave washer 11 is placed on the flange 2b of the sheet member 2, and then the bobbin 4 around which the coil 5 is wound is placed.

Next, the plunger guide 6 is inserted inside the bobbin 4, and the plunger 7 is housed inside the plunger guide 6. The bobbin 4 in which the plunger guide 6 has been inserted is covered 3
You may insert it inside.

Next, the cover plate 20 is covered with the outer peripheral edge portion of the cover 3
Of the plunger guide 6 protruding from the bobbin 4 when the tip end 20d for positioning and fixing the plunger guide is put in contact with the outer peripheral surface of the plunger guide 6 so as to engage with the stepped portion 3a provided in advance. Side is tip 20
Radially positioned by d.

When the cover plate 20 is pressed downward in FIG. 2 against the elastic force of the wave washer 11, and the bobbin 4 is fitted to the projecting portion 2b of the sheet member 2 by this, the lower end side of the bobbin 4, that is, The other end of the plunger guide 6 is positioned, and the end edge portion 3 of the cover 3 is pressed in the pressed state.
Fix b by crimping.

Next, the operation of the solenoid valve will be described. When the coil 5 is not energized, the plunger 7 is lifted by the oil pressure ejected from the oil inflow port 1, and the oil is drained through the oil groove 7b and the drain hole provided in the plunger 7 as shown by the arrow. Therefore, the oil pressure is close to zero. At this time, the upper end 7c of the plunger 7 has a lower surface (stopper surface) 20f of the rising portion 20c.
And the stroke of the plunger is restricted.

When the coil 5 is energized, a magnetic attraction force acts between the seat member 2 and the plunger 7, and the plunger 7 moves to the seat member 2
Is sucked to the side and the valve portion 7a closes the oil inlet 1. Therefore, the hydraulic pressure on the valve body B side increases.

As described above, in this embodiment, the cover plate 2
0 not only restricts the stroke of the plunger 7 as in the past by the lower surface 20f of the plurality of rising portions 20c, but also by the tips 20d of the plurality of tongue-shaped protrusions 20b,
Since the plunger guide 6 projecting from the bobbin 4 can also be positioned on one end side, the conventional plunger 7
The plate used for positioning on one end side of the can be made useless. Therefore, the number of parts and the number of assembling steps can be reduced, and the cost of the solenoid valve can be reduced.

FIG. 5 is a side sectional view of another embodiment of the present invention, in which the plunger guide and the body are integrally molded. With such a configuration, the number of parts and the number of assembling steps can be further reduced, and the cost can be further reduced.

(Effect of the Invention) As described above, in the solenoid valve structure of the present invention,
The cover plate includes a flat portion, a plurality of tongue-shaped projections extending in the radial direction from the flat portion toward the axis, and the tip of which is used for positioning and fixing one end side of the plunger guide, and the tongue-shaped projections. Rising from the flat portion adjacent to the portion, and further in parallel to the flat portion and in the radial direction,
The tip end extends toward the axial center to form a drain hole, and the lower surface thereof is integrally formed with a plurality of rising portions used as stopper surfaces for restricting the stroke of the plunger.

For this reason, members other than the cover plate used for positioning the one end side of the plunger guide in the related art are not required, and the number of parts of the solenoid valve and the number of assembling steps can be reduced. Therefore, it is possible to reduce the cost of the solenoid valve.

Further, by integrally forming the bobbin and the inner surface of the flat spring guide, the number of parts can be further reduced, and the cost can be further reduced.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, FIG. 3 is a perspective view of a plunger, FIG. 4 is a perspective view of a cover plate, and FIG. FIG. 6 is a sectional view of a bobbin with a plunger guide which is another embodiment of the invention, and FIG. 6 is a side sectional view of a conventional two-way valve solenoid valve. 1 ... Oil inlet, 1a ... Insert into valve body, 2
...... Sheet member, 2a ... Flange, 3 ... Cover, 3
a: step portion, 3b ... edge portion, 4 ... bobbin, 5 ... coil, 6 ... plunger guide, 7 ... plunger, 8
...... Lead wire, 9 ... Plate, 10 ... Cover plate, 11 ... Wave washer, 12 ... O ring, 2
0 ... Cover plate, 20a ... Flat part, 20b ...
Tongue-shaped protrusion, 20c ... rising portion, 20d ... tip, 2
0e ... Tip, 20f ... Bottom surface, 20g ... Drain hole

Claims (2)

[Scope of utility model registration request] 1. A sheet member having an oil inlet, a cover formed integrally with or fixed to the sheet member, and a bobbin housed and fixed inside the cover and having a coil wound therein. A plunger guide fixed to the inside of the bobbin and projecting at one end side from the bobbin; a plunger slidably accommodated in the plunger guide and having an oil passage in the axial direction; and fixed to the cover. In a solenoid valve of a type including a cover plate that restricts the stroke of the plunger on one end side of the bobbin and that has a drain hole that allows the oil that has flowed into the oil passage to flow out, a flat portion ( 20a) and a tip (20) extending radially from the flat portion toward the axis.
d) a plurality of tongue-shaped projections (20b) used for positioning and fixing on one end side of the plunger guide, and rising from the flat part adjacent to the tongue-shaped projections and parallel to the flat part. And in the radial direction toward the axis, the tip (20e) of which forms the drain hole,
An electromagnetic valve structure characterized in that the lower surface (20f) is integrally formed with a plurality of rising portions (20c) used as stopper surfaces for restricting the stroke of the plunger. 2. The solenoid valve structure according to claim 1, wherein the bobbin and a plunger guide fixed to the inside of the bobbin are integrally formed.