Vane type hydraulic actuator

Details Vane type hydraulic actuator Vane type hydraulic actuator

1999-04-19

2001-05-29

Verdier, Christopher (Department: 3745)

Expansible chamber devices

Oscillating working member or cylinder therefor

Oscillatory shaft with radially extending vane

Reexamination Certificate

active

06237466

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vane type hydraulic actuator for use, for example, in a valve timing adjusting apparatus, which controls the timing of opening and closing of an intake valve and/or exhaust valve of an engine, in response to the running condition of the engine.
2. Description of the Prior Art
FIG. 23
is a cross sectional view of a vane type hydraulic actuator of the prior art, specifically, it is a vane type hydraulic actuator shown in Japanese Patent Application JP-A-314069 applied by the same applicant of this patent application.
FIG. 24
is a detailed cross sectional view of the plunger portion of the actuator shown in
FIG. 23
, which is a main portion of the actuator.
FIG. 25
is a cross sectional view of the plunger portion shown in
FIG. 24
, at a state when an oil pressure is applied.
Reference numeral
19
denotes a cam shaft for an intake valve having a cam for the intake valve
19
a
. A timing pulley
21
is disposed at an end portion of the cam shaft
19
. An actuator for valve timing adjusting is connected with the cam shaft
19
. The working oil of the actuator
40
is the lubrication oil of the engine (not shown). The actuator
40
functions to change the biasing angle of the cam shaft
19
so as to change continuously the timing of the opening and closing of the intake valve (not shown). Reference numeral
41
is a bearing for the cam shaft
19
, and reference numeral
42
denotes the housing of the actuator
40
, which can rotate relatively to the cam shaft for the intake valve
19
.
A case
43
is fixed to the housing
42
, which accommodates a vane type rotor
44
therein. The rotor
44
is fixed to the cam shaft
19
by a bolt
45
, and can rotate relatively to the case
43
.
A chip seal
46
is disposed between the case
43
and the rotor
44
, for preventing the leakage of working oil between chambers limited by the case
43
and the rotor
44
. For this purpose, the chip seal
46
is urged by a plate spring
47
to contact tightly with the rotor
44
.
A cover
28
is fixed to the case
43
. The housing
42
, the case
43
and the cover
48
are commonly fastened by a bolt
49
. Reference numerals
50
,
51
, and
52
denote an O-ring, a plate, and a bolt, respectively. Reference numerals
53
,
54
denote O-rings. A cylindrical holder
55
is disposed in the rotor
44
. The holder has an engaging hole
55
a
extending in the longitudinal direction of a plunger
56
so as to engage with the plunger
56
.
The plunger
56
can slide in the housing
42
, and has an engaging shaft portion
56
a
, which can enter into the engaging hole
55
a
of the holder
55
and can engage with it. The plunger
56
is urged by a spring
57
towards the holder
55
. A working oil is introduced into the engaging hole
55
a
through a plunger oil channel
58
.
When a working oil is introduced into the engaging hole
55
a
, the plunger
56
moves against the spring
57
, so that the locking between the holder
55
and the plunger
56
is released. Reference numerals
59
,
61
denote air holes. Reference numeral
60
denotes a shaft bolt rotatable relatively to the cover
48
.
A first oil channel
62
and a second oil channel
63
extend through the cam shaft for the intake valve
19
and through the rotor
44
. The first oil channel
62
communicates with an oil pressure chamber for timing retard (retarding chamber)
73
, which serves to rotate the rotor
44
in the timing retard direction. The second oil channel
63
communicates with an oil pressure chamber for timing advance (advancing chamber)
74
, which serves to rotate the rotor
44
in the timing advance direction. In this specification and the claims, the “timing retard direction” means the direction to increase the volume of the oil pressure chamber for timing retard
73
, the counterclockwise direction in
FIG. 26
, and the “timing advance direction” means the direction to increase the volume of the oil pressure chamber for timing advance
74
, the clockwise direction in FIG.
26
. Both the pressure chambers
73
,
74
will be explained later.
The working oil for the actuation of the actuator
40
is supplied through an oil control valve
80
(hereinafter called OCV), which controls the amount of oil to be sent to the actuator
40
. 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
and a linear solenoid
84
to move the spool
82
against the biasing force of the spring. The working oil is supplied from a lubrication oil supplying apparatus, which is provided for supplying lubrication oil to each part of engine (not shown). The lubrication oil supplying apparatus is comprised of an oil pan
91
, an oil pump
92
and an oil filter
93
. The inlet port of the OCV
80
is connected with the oil filter
93
through an oil supply piping
85
a
. The outlet ports of the OCV
80
are connected with the first and second oil channels
62
,
63
through a first piping
89
and a second piping
90
. The working oil returns to the oil pan
91
through a drain piping
88
. They constitute a working oil supplying apparatus to the actuator
40
together with the oil control valve OCV
80
.
An electronic control unit
100
(hereinafter called ECU) controls an injector, an igniter, which are not shown, and the OCV
80
, on the basis of signals from an intake air amount sensor, a throttle sensor, a water temperature sensor, a crank angle sensor, and a cam angle sensor, which are not shown. Thus, the ECU controls the fuel injection amount, the timing of the ignition, the timing of opening of the OCV
80
and the timing of the closing of the OCV
80
after the cut off of the ignition switch.
FIG. 26
is a cross sectional view of
FIG. 23
along the line X—X.
FIG. 27
is a cross sectional view in part, showing a state that a slide plate in
FIG. 26
is displaced.
FIG. 28
is a cross sectional view of
FIG. 23
along the line Y—Y.
FIG. 29
is a cross sectional view of
FIG. 23
along the line Z—Z.
The rotor
44
has first to fourth vanes
64
-
67
projecting outwardly in the radial direction. The tips of the vanes
64
-
67
slide along the inner surface of the case
43
, contacting with it. A chip seal
68
, as a sealing element is disposed at the contacting portion of each vane
64
-
67
. A back spring (not shown) is disposed between the vane
64
-
67
and the chip seal
68
so as to urge the chip seal towards the inner surface of the case
43
, which is the counter surface of the chip seal. Shoes
71
are provided in the case
43
, which are portions jutting inwardly at the inner surface of the case
43
. A bolt hole
72
is disposed in the shoes
72
, through which the bolt
49
shown in
FIG. 23
is inserted.
The tip of each shoe
71
slides along the outer surface of a vane supporting portion
69
, contacting with it. The vane supporting portion
69
supports the vanes.
Each space contoured by the inner surface of case
43
and the outer surface of the rotor
44
and limited by neighboring shoes
71
are divided by a vane
64
-
67
into an oil pressure chamber for timing retard
73
and an oil pressure chamber for timing advance
74
. The oil pressure chamber for timing retard
73
serves to rotate the vanes in the timing retard direction, and the oil chamber for timing advance
74
serves to rotate the vanes in the timing advance direction. The cross section of each oil chamber
73
,
74
has a substantially fan like form.
The oil pressure chamber for timing retard
73
and the oil pressure chamber for timing advance
74
are connected by a communicating channel
75
. A groove
76
, with which the plunger oil channel
58
communicates, is disposed in the communicating channel
75
.
The communicating channel
75
is separated by a slide plate
77
disposed in this groove
76
. The slide plate
77
prevents the oil leakage between the oil chamber for timing retard
73
and the oil chamber for timing advance
74
.
The slide plate
77
is movable in this groove
76
. When

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