Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
2002-02-19
2003-09-02
Hirsch, Paul J. (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C251S129200
Reexamination Certificate
active
06612544
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plunger-type electromagnetic valve for appropriately controlling hydraulic pressure, for example, in a valve timing varying device for controlling a timing of opening or closing the intake-exhaust valves of an internal combustion engine.
2. Description of the Related Art
FIG. 11
is a cross sectional view showing a conventional electromagnetic valve.
Referring to
FIG. 11
, a reference numeral
1
denotes a valve housing having a plurality of ports
2
,
3
,
4
and
5
a
,
5
b
for connecting fluid passages. A reference numeral
6
denotes a spool, accommodated in the valve housing
1
slidable in the axial direction, for opening or closing the ports
2
,
3
,
4
, and
5
a
,
5
b
. A reference numeral
7
denotes a yoke coupled and fixed to axially provided one end of the valve housing
1
. A reference numeral
8
denotes a boss arranged at the axial center on the side coupled to the valve housing
1
of the yoke
7
. The boss
8
acts as a fixed iron provided core on the plunger
15
side and is made of a cylindrical magnetic material.
A reference numeral
9
denotes a coil bobbin fitted to the yoke
7
. A reference numeral
10
denotes a linear coil wound around the outer periphery of the coil bobbin
9
. A reference numeral
11
denotes a core (fixed iron core) fitted to an axially provided end of the yoke
7
and the core
11
is made of a magnetic material with which a cylindrical portion
11
a
is integrally formed. The cylindrical portion
11
a
is fitted to the coil bobbin
9
and coaxially opposed to the above boss
8
.
A reference numeral
12
denotes a bearing fitted to the boss
8
. A reference numeral
13
denotes a bearing fitted to the cylindrical portion
11
a
of the core
11
. A reference numeral
14
denotes a non-magnetic plunger rod whose both ends are slidably supported by the bearings
12
,
13
in the axial direction. A reference numeral
15
denotes a plunger having therein a plunger rod
14
passing therethrough and fixed to its axial center. The plunger
15
is made of a magnetic material and capable of moving in the axial direction with the plunger rod
14
. A reference numeral
16
denotes a spring for urging the spool
6
in the abutting direction against the plunger rod
14
. A reference numeral
17
denotes a terminal electrically coupled to the linear coil
10
. A reference numeral
18
denotes a resin for molding the linear coil
10
and the terminal
17
.
FIG. 12
is a cross sectional view showing an example of a valve timing adjusting device with the electromagnetic valve shown in FIG.
11
.
Referring to
FIG. 12
, a reference numeral
30
denotes a cam shaft having a cam
31
for opening or closing the intake-exhaust valves of an internal combustion engine. A reference numeral
32
denotes an actuator which is provided on one end of the cam shaft
30
for changing a valve timing. By driving the actuator
32
with the lubricating oil (hydraulic oil) of the internal combustion engine, a displacement angle of the cam shaft
30
is varied to continuously change the timing of opening or closing the intake valve or the exhaust valve of the internal combustion engine.
A reference numeral
33
denotes the housing of the actuator
32
and the housing
33
is rotatably mounted on the cam shaft
30
. A reference numeral
34
denotes a timing pulley or a timing sprocket integrally combined with the housing
33
. The timing pulley or the timing sprocket
34
serves as an input rotating member for receiving a rotational driving force from the crankshaft of the internal combustion engine via a timing belt or a timing chain.
A reference numeral
35
denotes a case fixed to the housing
33
. A reference numeral
36
denotes a vane-type rotor coupled and fixed to the cam shaft
30
and accommodated in the case
35
. The rotor
36
is relatively slidable with respect to the case
35
within a predetermined angle range. A reference numeral
37
denotes a cover fixed to the case
35
. A reference numeral
38
denotes a plate for closing the opening of the cover
37
. A reference numeral
39
denotes a locking holder provided on the rotor
36
. A reference numeral
40
denotes a lock pin slidably built in the housing
33
. The lock pin
40
is removably engaged with the holder
39
to restrain the rotation of the rotor
36
or release the restraint.
A reference numeral
41
denotes a spring for urging the lock pin
40
in the engaging direction with the holder
39
. A reference numeral
42
denotes a lock-releasing oil passage for introducing the hydraulic oil into the holder
39
. The lock pin
40
is moved against the spring
41
by the hydraulic oil introduced into the holder
39
from the lock-releasing oil passage
42
and is coned off from the inside of the holder
39
to release the restraint of the rotor
36
. Reference numerals
43
,
44
and
45
denote an air inlet, a shaft bolt for fixing the rotor
36
to the cam shaft
30
, and an air inlet, respectively.
FIG. 13
is a cross sectional view taken along a line A A in FIG.
12
.
Referring to
FIG. 13
, a reference numeral
46
denotes a plurality of vanes protruded on the outer peripheral surface of the rotary body of the rotor
36
. A reference numeral
47
denotes a plurality of shoes (the same number as the vanes
46
) protruded on the inner peripheral surface of the case
35
. A reference numeral
48
denotes tip seals provided on the tips of the respective shoes
47
and each tip seal
48
is slidably pressed to the rotary body of the rotor
36
by the urging force of the back spring
49
shown in
FIG. 12. A
reference numeral
50
denotes tip seals provided on the tips of the respective vanes
46
and each tip seal
50
is slidably contacted with the inner peripheral surface of the case
35
by a back spring (not shown).
A reference numeral
51
denotes a lag hydraulic chamber for moving the vane
46
in the lagging direction with the hydraulic oil. A reference numeral
52
denotes an advance hydraulic chamber for moving the vane
46
in the advancing direction with the hydraulic oil. Each of the lag hydraulic chambers
51
and the advance hydraulic chambers
52
is made of a fan-shaped space formed between case
35
and the rotor
36
, and between the shoe
47
and the vane
46
, and is supplied therein with the hydraulic oil.
A reference numeral
53
denotes a communication oil passage formed in one vane
46
to make the lag hydraulic chamber
51
communicate with the advance hydraulic chamber
52
on both sides of the vane
46
. A reference number
54
denotes a moving groove formed on the midway of the communication oil passage
53
. The lock-releasing oil passage
42
is communicated with the moving groove
54
on the midway thereof. A reference numeral
55
denotes a slide plate moving along the moving groove
54
. The slide plate
55
divides the communication oil passage
53
to prevent an oil leakage between the lag hydraulic chamber
51
and the advance hydraulic chamber
52
. When the hydraulic pressure in the lag hydraulic chamber
51
is high, the slide plate
55
moves to the advance hydraulic chamber
52
, and when the hydraulic pressure in the advance hydraulic chamber
52
is high, the slide plate
55
moves to the lag hydraulic chamber
51
. In this manner, the slide plate plays a change valve for switching the oil passages.
In the above, the cam shaft
30
and the rotor
36
are provided with the first oil passage
56
and the second oil passage
57
as shown in FIG.
12
. The first oil passage
56
communicates with the lag hydraulic chamber
51
and the second oil passage
57
with the advance hydraulic chamber
52
. The rotor
36
is relatively rotated with respect to the housing
33
in proportion to the quantity of hydraulic oil supplied to the lag hydraulic chamber
51
and the advance hydraulic chamber
52
to vary the volume of the lag hydraulic chamber
51
and the advance hydraulic chamber
52
.
In
FIG. 12
, a reference numeral
60
denotes an oil control valve (hereinafter
Matuzawa Hiroaki
Sakata Akira
Hirsch Paul J.
Mitsubishi Denki & Kabushiki Kaisha
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