Vane type hydraulic actuator

Details Vane type hydraulic actuator Vane type hydraulic actuator

2001-07-16

2001-12-25

Lo, Weilun (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C074S56800M, C464S002000, C464S160000

Reexamination Certificate

active

06332439

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vane type hydraulic actuator for controlling the timing of opening and closing of an intake and/or exhaust valve, corresponding to an operational state of an engine.
2. Description of the Prior Art
FIG. 18
is a cross sectional view of a vane type hydraulic actuator invented by the inventors of this application and is disclosed in JP-9-314069-A.
FIG. 19
is a detailed cross sectional view of the plunger part shown in FIG.
18
.
FIG. 20
is a cross sectional view of the plunger part in a state that a hydraulic pressure is applied.
Reference numeral
19
denotes an intake side cam shaft having an intake side cam
19
a
. An actuator
40
is connected to an end of the intake side cam shaft
19
, and a timing pulley
21
is disposed around the actuator
40
. The working oil of the actuator
40
is lubrication oil, delivered from an engine (not shown). The actuator is actuated by the working oil so as to adjust phase angle of the rotation of the intake side cam shaft
19
so that the opening and closing timings of intake valves of the engine can be continuously adjusted. The intake side cam shaft
41
is supported by a bearing
19
. The actuator
40
has a housing
42
, which can freely rotate around the intake side cam shaft
19
.
A case
43
is fixed to the housing
42
. And a vane type rotor
44
is received in the case
43
. The vane rotor
44
is fixed to the intake side cam shaft
19
by means of bolts
45
. The rotor
44
is rotatable relative to the case
43
in a predetermined anglular region.
The case
43
and the rotor
44
form hydraulic pressure chambers separated from each other. A chip seal
46
is disposed between the case
43
and the rotor
44
so that no oil leakage between the oil pressure chambers can occur. A back spring
47
made of an iron plate is disposed to push the chip seal
46
towards the rotor
44
.
The housing
42
, the case
43
and a cover
48
connected to the case
43
are fixed by a common volt
49
. An O-ring
50
is disposed between the case
43
and the bolt
50
. A plate
51
is fixed to the cover
48
by a bolt
52
. Reference numerals
53
,
54
denote O-rings. A cylindrical holder
55
is disposed in the rotor
44
. The cylindrical holder
55
has an engaging hole
55
a, which can engage with a plunger
56
, as will be explained below.
The plunger
56
disposed in the housing
42
can slide therein and has an engaging shaft
56
a, which can engage with the engaging hole
55
a
of the holder
55
. The plunger
56
is pushed by a spring
57
towards the holder
55
. Working oil is delivered into the engaging hole
55
a
of the holder
55
through a plunger oil channel
58
. When working oil is delivered into the engaging hole
55
a
of the holder
55
, the plunger
56
moves opposingly to the spring
57
so that the plunger
56
is unlocked from the holder
55
. The rotor
44
is fixed to the intake side cam shaft
19
by means of a bolt
60
. Reference numerals
59
,
61
denote air holes.
A first and second oil channels
62
,
63
are disposed in the intake side cam shaft
19
and the rotor
44
. The first oil channel
62
communicates with an oil pressure chamber for timing retard
73
, and the second oil channel
63
communicates with an oil pressure chamber for timing advance
74
.
The amount of the working oil to be delivered to the actuator
40
is controlled by an oil control valve
80
, which will be abbreviated to OCV hereinafter.
The OCV
80
comprises a valve housing
81
, a spool
82
which can slide in the valve housing
81
, a spring
83
urging the spool
82
toward one direction, and a linear solenoid
84
for displacing the spool
82
resisting the spring
83
. The OCV is connected with an oil pan
91
through an oil supplying pipe
85
a
. An oil pump
92
and an oil filter
93
are disposed in the oil supplying pipe
85
a
. The first and second oil channels
62
,
63
are connected with the OCV
80
through a first and second oil pipes
89
,
90
, respectively. The working oil returns to the oil pan
91
from the OCV
80
through an oil drain pipe
88
. The oil pan
91
, the oil pump
92
, the oil filter
93
are a part of a lubrication system for lubricating portions to be lubricated in the engine (not shown), and simultaneously they form a working oil delivery system to the actuator
40
.
An electronic control unit
100
, which is abbreviated to ECU hereinafter, controls the amount of fuel injection into the engine, the timings of the ignition, and the timing of the opening and closing of valves. The control corresponds to the inputs from an intake air amount sensor, a throttle sensor, crank angle sensor and a cam angle sensor, which are not shown. The electronic control unit
100
further controls the closing timing of valves after the switching off of the ignition switch.
FIG. 21
is a cross sectional view of
FIG. 18
along the line X—X.
FIG. 22
shows a state in which a slide plate shown in
FIG. 21
is displaced.
FIG. 23
is a cross sectional view of
FIG. 18
along the line Y—Y,
FIG. 24
is a cross sectional view of
FIG. 18
along the line Z—Z.
As shown in the figures, a first to fourth vanes
64
-
67
project radially from the rotor
44
. A chip seal
68
is disposed at the tip of each vane
64
-
67
. The chip seal
68
contacts with the inner surface of the case
43
and can slide along the surface. The chip seals
68
seal between the chambers disposed at both sides of the vanes. By the way, a back spring (not shown) is disposed behind each chip seals
68
for increasing the capacity of the sealing.
Four shoes
71
project inwardly from the inner surface of the case
43
. The shoe
43
has a bolt hole
72
, into which the bolt
49
shown in
FIG. 18
is screwed.
The tip portion of each shoe
71
contacts with a vane supporting portion
69
of the rotor, namely the hub of the rotor, which supports the vanes. The tip portion of each shoe
71
slides along the outer surface of the vane supporting portion
69
. Each room between the adjacent shoes
71
is divided by the corresponding shoe
71
into an oil pressure chamber for timing retard
73
and an oil pressure chamber for timing advance
74
. These chambers
73
,
74
are formed alternatively and have a form of a sector like room contoured peripherally by the inner surface of the case
43
and the outer surface of the rotor
44
and contoured radially by one of the shoes
71
and one of the vanes
64
-
67
of the rotor
44
.
The oil pressure chamber for timing retard
73
is used for swing the first to fourth vanes
64
-
67
so that the timing of the opening and closing of valves is retarded. And the oil chamber for timing advance
74
is used for swing the first to fourth vanes
64
-
67
so that the timing of the opening and closing of valves is advanced.
The oil pressure chamber for timing retard
73
and the oil pressure chamber for timing advance
74
disposed at both side of the first vane
64
are communicated through a communicating channel
75
, which passes through the first vane
64
. A groove
76
is disposed in the communicating channel
75
, and the plunger oil channel
58
communicates with the groove
76
.
A slide plate
77
is disposed in the groove
76
. The slide plate
77
divides the communicating channel
75
into two parts in such a manner that the oil leakage between the oil pressure chamber for timing retard
73
and the oil pressure chamber for timing advance
74
is prevented.
The slide plate
77
moves toward the oil pressure chamber for timing advance
74
, when the oil pressure in the oil pressure chamber for timing retard
73
is higher. It moves towards the oil chamber for timing retard
73
, when the pressure in the oil pressure chamber for timing advance
74
is higher. The arrow marks in
FIGS. 21
,
23
,
24
show the rotation direction of the actuator
40
as a whole.
The oil pressure chambers for timing retard and advance
73
,
74
are surrounded by the housing
42
, case
43
, rotor
44
and cover
48
. The oil pressure chamber

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