Variable capacity supercharger

Details Variable capacity supercharger Variable capacity supercharger

2000-03-13

2001-11-06

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

C415S201000, C415S214100, C415S196000, C417S423140

Reexamination Certificate

active

06312217

ABSTRACT:

This application claims priority on Japanese Patent Application Number 65020/1999, filed Mar. 11, 1999, the entire disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a variable capacity supercharger whose flow rate of gas introduced can be adjusted.
2. Prior Art
The variable capacity supercharger in which a plurality of nozzle vanes are assembled and the rate of flow of gas to be introduced into a turbine is adjusted by controlling the throat between the nozzle vanes, have been widely used. Such supercharger is described in, for example, unexamined Japanese patent publication No. 296731/1997 and unexamined Japanese utility model publication No. 73597/1992. One of these examples is shown in
FIGS. 1A and 1B
. In detail, turbine housing
1
and compressor housing
2
are integrated into one body via bearing housing
3
. Turbine impeller
4
in turbine housing
1
and compressor impeller
5
in compressor housing
2
are connected with turbine shaft
7
supported freely rotatably by bearing
6
in bearing housing
3
. Annular turbine shroud
9
with gas discharge channel
9
a
is formed on the inner periphery of the above-mentioned turbine housing
1
on the side opposite to bearing housing
3
using bolts
8
. Annular channel
10
is constructed between axially opposed surfaces of the outer periphery of the turbine shroud
9
and the inner periphery of turbine housing
1
on the bearing housing
3
side. On the outer surface of above-mentioned turbine housing
1
on the side opposite to bearing housing
3
, cover
12
with gas outlet
11
that communicates with gas discharge channel
9
a
of the turbine shroud
9
is installed using bolts
13
. Gas introduced from gas inlet
14
is guided to turbine impeller
4
from scroll channel
15
provided in turbine housing
1
to turbine impeller
4
through above-mentioned annular channel
10
, then the gas is discharged from gas outlet
11
via gas discharge channel
9
a
. In this configuration, a large number of nozzle vanes
16
are arranged circumferentially in annular gas channel
10
constructed from above-mentioned scroll channel is to the outer periphery of turbine impeller
4
. One end of operating shaft
17
is fixed at the each nozzle vane
16
and the other end of the shaft penetrates the outer portion of turbine shroud
9
. The shaft
17
is protruded into torque transmission chamber
18
constructed between turbine shroud
9
and cover
12
, and is connected to an actuator via transmission mechanism
19
in a link mechanism.
The transmission mechanism
19
is constructed as follows. Each operating shaft
17
rotatably engages with the base end of link
20
, and the link is provided with engagement slot
20
a
at the tip end. Rotation ring
21
is arranged circumferentially on the outer part of each operating shaft
17
. The same number of connecting pieces
22
as the number of the links
20
are installed freely rotatably at the rotation ring
21
via shafts
23
. Each connecting piece
22
is engaged freely rotatably with engagement slot
20
a
of the each link
20
. Pin
24
is installed at a freely selected location in the circumferential direction of the rotation ring
21
. An actuator (not illustrated) is connected to pin
24
through arm
25
, shaft
26
, and transmission lever
27
. The actuator rotates rotation ring
21
, and as the rotation ring
21
revolves, an opening or closing angle of each nozzle vane
16
can be changed by means of each link
20
and operating shaft
17
. Thus, the opening or closing angle of each nozzle vane
16
is controlled, and a throat between each nozzle vane
16
is adjusted to widen or narrow, so that the flow rate of gas can be varied from large to small rates.
However, in the case of a variable capacity supercharger in the above-mentioned type, because turbine shroud
9
is fixed to turbine housing
1
using bolts
8
, the effect of thermal deformation in turbine housing
1
directly affects turbine shroud
9
, resulting sometimes in changes in concentricity and inclination of the shroud. In addition because cover
12
is installed on turbine housing
1
with bolts
13
, when transmission mechanism
19
is assembled, mounting work must be done in a blind condition, so the work is difficult. Consequently, if cover
12
is removed, the interior is inspected, and the equipment is reassembled, the results of the first adjustment often deviate from intended values because of divided transmission mechanism
19
, often causing the practical problem of positional offset.
SUMMARY OF THE INVENTION
Therefore the objects of the present invention include isolating the turbine shroud from direct transmission of thermal deformation of the turbine housing, easy and simple assembly of the transmission mechanism by mounting the cover on the turbine housing, and maintaining its initial condition after reassembly even if the cover is removed many times from the turbine housing.
The present invention provides a configuration to solve the aforementioned problems; annular turbine shroud (
9
) with gas discharge channel (
9
a
) formed at its inner periphery is arranged on the inner periphery on the opposite side to bearing housing (
3
) of turbine housing (
1
); annular channel (
10
) is created between axially opposed surfaces of the outer periphery of the above-mentioned turbine shroud and the inner periphery of the turbine housing on the bearing housing side; a large number of nozzle vanes (
16
) are arranged, whose opening or closing angle can be adjusted by rotating operating shaft (
17
) that penetrates the outer periphery of the above-mentioned turbine shroud; transmission mechanism (
19
) is connected to the operating shaft, penetrates cover (
12
) installed on the outer surface of the turbine housing and is connected to an external actuator; with the variable capacity supercharger configured above, above-mentioned turbine shroud (
9
) is structured to insert in turbine housing (
1
) in the axial direction, gas discharge channel (
9
a
) of the turbine shroud is constructed at the cover, and turbine (
9
) is integrated into cover (
12
).
According to the configuration of the present invention, the turbine shroud is integrated into the cover and isolated from the turbine housing, therefore, even when the turbine housing thermally deforms, it does not directly affect the turbine shroud. In addition, since the transmission mechanism can be maintained as originally assembled even after removing the cover, the initial assembly conditions can be retained even after reassembly.
Furthermore, a plurality of mounting holes (
28
) are constructed circumferentially at predetermined intervals in gas discharge channel (
9
a
) of turbine shroud (
9
), screw holes (
29
) corresponding to the mounting holes (
28
) are arranged with a slight offset to the above-mentioned mounting holes in the gas discharging direction, in annular holder (
12
a
) which is formed to screw in and retain the gas discharge channel (
9
a
) on the inner surface of cover (
12
); and fixing screws (
30
) with taper pins (
30
a
) tapered at tip portions are screwed in the above-mentioned screw holes, so that taper pins can be screwed into the mounting holes.
In this configuration according to the present invention, the turbine shroud can be strongly constricted in the axial direction, so that the spacing for coupling to the cover can be reduced.
Other objects and advantages of the present invention are revealed by the following description referring to the attached drawings.


REFERENCES:
patent: 4-73597 (1992-06-01), None
patent: 09-296731 (1997-11-01), None

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