JPS6137791Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust supercharger equipped with a variable displacement turbine.

Conventionally, an exhaust supercharger is often used as a means for increasing the output per cylinder volume of an internal combustion engine. This exhaust supercharger uses a turbine to receive high-temperature, high-pressure exhaust gas supplied from the exhaust manifold of an internal combustion engine, and a blower directly connected to the turbine is driven to supply intake air to each cylinder via the intake manifold. It works like that.
Normally, the exhaust supercharger installed on an internal combustion engine is one that corresponds to the set operating range of the internal combustion engine and exhibits a specified supercharging effect. When approaching the side, the supercharging effect of the exhaust supercharger often decreases. Increasing the supercharging effect in such low speed operating ranges,
In order to increase the low-speed torque of an internal combustion engine, an exhaust supercharger (hereinafter simply referred to as an exhaust supercharger) with a variable displacement turbine is used.

For example, as shown in FIG.
In this example, a plurality of nozzle vanes 4 are arranged in an annular manner in an annular inlet 3 around a turbine wheel 2. When the amount of exhaust gas flowing into the annular inlet 3 is large, each nozzle vane 4 is spaced apart from other adjacent nozzle vanes and supported so as not to create a large resistance to the exhaust gas. On the other hand, when the amount of exhaust gas flowing into the annular inlet 3 is small, each nozzle vane 4 is rotated,
The distance between them is narrowed. As a result, even if the amount of exhaust gas flowing in is small, its velocity energy can be effectively applied to the turbine wheel 2.
Internal combustion engines can increase low-speed torque.

Such an exhaust supercharger 1 includes, as members for operating the nozzle vanes 4, a nozzle vane shaft 6 pivoted to a back plate 9 attached to a bearing housing 5, and a lever 7 fixed to the nozzle vane shaft 6.
and a rotation ring 8 connected to the rotation end side of the lever 7 and rotatably supported by the bearing housing 5. When assembling the exhaust supercharger 1 equipped with these nozzle vane operating members, first,
A rotating ring 8 is fitted onto the bearing housing 5, and then a back plate 9 to which a plurality of nozzle vanes 4 are attached is fixed to the bearing housing 5. Furthermore, the levers 7 on each nozzle vane side are connected to the rotation ring 8 side, respectively. in this way,
Bearing housing 5 is used to assemble exhaust supercharger 1.
First, it is necessary to fit the rotating ring 8 onto the outside, and for this purpose it is necessary to separate the bearing housing 5 and the back plate 9 and to connect them together. Furthermore, there is a drawback that the connection work between the lever 7 and the rotating ring 8 side is also time-consuming. In addition, the rotating ring 8 is likely to shift in the fitting direction, which reduces assembly workability and may cause twisting if it is not subjected to a pressing force in an accurate direction during operation.

The purpose of this invention is to provide an exhaust supercharger that is easy to assemble.

The exhaust supercharger according to this invention uses a bearing housing that pivotally supports a center shaft and a turbine housing to form an annular inlet through which exhaust gas flows toward a radial turbine impeller attached to the center shaft. A nozzle vane is provided at one end of each of a plurality of supporting shafts that are conventionally arranged in an annular shape so that the wall of the bearing housing facing the bearing housing faces in the same direction as the center shaft direction, and these nozzle vanes are integrated with the above-mentioned shaft. A lever extending in a direction substantially perpendicular to each of the support shafts is attached to the other end of each support shaft, and a rotating part is attached to the annular groove formed in the outer peripheral wall of the bearing housing concentrically with the center shaft. The rotating portion has an engaging portion that protrudes in the same direction as the center shaft direction, and the engaging portion is a ring-shaped ring that communicates with a yoke portion formed at each rotating end of the plurality of levers. and a pair of ring supports whose outer ends are fixed to the ring material and whose inner arcuate ends slide into the annular groove, and by rotating the ring material, the lever and each The plurality of nozzle vanes are configured to vary the opening amount of the annular inlet via the support shaft.

In the assembly work of such an exhaust supercharger, first,
A pair of ring supports are arranged to sandwich the annular groove at the center of the bearing housing, and the outer ends of these ring supports are fixed to the ring material. As a result, the rotating portion is integrally assembled and externally fitted in the annular groove so as to be rotatable. Next, the other end of the support shaft of each nozzle vane and the ring member are connected via a lever to assemble each member for operating the nozzle vane. For this reason, this exhaust supercharger does not require the work of connecting the back plate on which the nozzle vanes are pivotally connected to the bearing housing, or the rotating part that operates multiple nozzle vanes at the same time. First, the rotating part can be directly and easily attached to the bearing housing to which the nozzle vane is attached without having to externally fit it onto the bearing housing, resulting in fewer assembly steps and easier assembly. Become.

This invention will be explained below with reference to the accompanying drawings.

FIG. 2 shows an exhaust supercharger 10 as an embodiment of this invention. The exhaust supercharger 10 has an outer frame formed by a central bearing housing 11, blower housings 12 attached to the left and right sides of the bearing housing, and a turbine housing 13. A center shaft 15 is pivotally connected to the bearing housing 11 substantially at its center via a floating metal 14. The center shaft 15 has a blower fan wheel 16 and a turbine wheel 17 attached to its left and right ends. A bearing support portion 18 in the bearing housing 11 that supports the floating metal 14 is formed with an oil passage 19 that supplies oil to the floating metal 14 side. Note that the reference numeral 20 indicates an oil discharge port.

The bearing housing 11 and the turbine housing 13 are tightened and fixed by an annular connecting belt 21. A turbine wheel 17 is housed between the two, and an annular inlet 22 is formed on the outer peripheral side of the turbine wheel 17. This annular inlet 22
High-temperature, high-pressure exhaust gas is supplied from an exhaust manifold side (not shown), and the turbine wheel 17 rotates upon receiving the velocity energy of this exhaust gas. A wall portion 23 facing the annular inlet 22 is formed in the shape of a brim on the right end side of the bearing housing 11, and a plurality of nozzle vanes 24 are pivotally attached to this wall portion 23. That is,
As shown in FIG. 3, a plurality of nozzle vanes 24
are arranged in an annular shape, and each is fixed to one end of a support shaft 25 passing through the wall portion 23 (see FIG. 2). By rotating each nozzle vane 24 around the support shaft 25, the distance t between adjacent nozzle vanes 24 can be varied, thereby making it possible to vary the opening amount of the annular inlet 22.
Each support shaft 25 is pivotally connected to the wall via a sleeve 26, and a lever 27 is attached to the other end. In addition,
The sleeve 26 is securely fixed to the bearing housing 11 by the holding plate 32. The lever 27 is
They are attached to each support shaft 25 and arranged radially around the center shaft 15, and their rotating ends are connected to the ring material 31, respectively. This ring member 31 is assembled with a pair of ring supports 28 fixed thereto to form a rotating portion 29. That is, an arcuate end 281 is formed on the inside of each ring support 28 to slide into an annular groove 30 formed in the outer peripheral wall 111 of the bearing housing 11, and an outer end 282 is connected to the ring member 3 by a bolt 38.
Fixed to 1. This pair of ring supports 28
and the ring material 31 are integrally assembled to form the rotating part 29.
When formed and externally fitted into the annular groove 30, this rotating portion 29 becomes rotatable around the center shaft 15. Further, as shown in FIG. 2, pins 33 as engagement parts are attached to the ring material 31 and project in a direction parallel to the center shaft direction A. A U-shaped end 271 (see FIG. 4) as a yoke portion formed at the moving end is engaged. Such a ring material 31 has a connecting piece 34 protruding from its outer peripheral surface, and this connecting piece 34
An actuator 35 is connected to the actuator 35, and by applying an output signal from a rotating portion control mechanism (not shown) to the actuator 35, the rotating portion 29 is rotated by a predetermined amount. Note that the reference numeral 36 is screwed or left-inserted into the annular groove 30, and is attached to the arc end 2 of the ring support.
81 is shown, and four of these bearing surfaces 36 are attached to the annular groove 30 to form a bearing for the rotating portion 27.

In the assembly work of the exhaust supercharger 10 shown in FIG. 2, first, the bearing housing 11 is placed on a pedestal (not shown). At this time, the bearing housing 11 has its wall portion 23 facing upward, and all the vane nozzles 24 are pivotally attached to this wall portion 23. Subsequently, all the levers 27 on the nozzle vane 24 side are arranged radially with respect to the center shaft center line l, and the U-shaped ends 271 of these levers are engaged with each pin 33 of the ring material 31, respectively.
Further, outer ends 282 of a pair of ring supports whose arcuate ends 281 sides are brought into contact with the annular groove 30 are superimposed on the ring material 31 and bolted together.
Thereby, the rotating part 29 can be externally fitted into the annular groove 30, and the rotating part and the plurality of nozzle vanes 24 can be connected. Next, the center shaft 15 to which the turbine impeller 17 is attached is inserted into the bearing support part 18,
Further, the turbine housing 13 is stacked on the bearing housing 11, and both are fixed with a connecting belt 21. After this, the bearing housing 11 side is reversed, and the blower fan wheel 1 is attached to the upward center shaft 15.
Insert 6 and secure with the nut. Subsequently, the blower housing 12 is superimposed on the bearing housing 11, and both are fixed with the connecting belt 37, and the assembly of the exhaust supercharger 10 is roughly completed.

Such an exhaust supercharger 10 is attached to an internal combustion engine (not shown) and is driven by receiving exhaust gas. Inflow. Here, if the inflow amount of exhaust gas exceeds the set amount, the blower fan wheel 16 side performs proper supercharging operation. On the other hand, when the inflow amount of exhaust gas falls below the set amount, a rotating portion control mechanism (not shown) is activated, and the rotating portion 29 is rotated about the center shaft by the actuator 35. In particular, the rotating portion 29 can rotate while being guided by the annular groove 30 without shifting in the center shaft direction A, and rotates each nozzle vane 24 interlocked therewith. As a result, the interval t between each nozzle vane is narrowed, and the opening amount of the annular inlet 22 is reduced, so even if the amount of exhaust gas flowing into the annular inlet is reduced, the velocity energy of the exhaust gas is kept at a predetermined level. Can be retained. That is, even if the displacement is reduced to some extent during low-speed operation, by narrowing the opening amount of the annular inlet 22, the turbine wheel 17 can receive enough velocity energy to obtain a supercharging effect from the exhaust gas. , the low-speed torque of the internal combustion engine can be increased.

According to the exhaust supercharger 10 shown in FIG. 2, the assembly of each member for operating the nozzle vane 24 is simpler than before. That is, the wall portion 23 to which the nozzle vane 24 is pivotally attached is formed as the bearing housing 11, and there is no need to assemble the wall portion 23 and a corresponding portion as in the conventional case. In order to obtain such an effect, the rotating portion 29 is formed by assembling the ring material 31 and the pair of ring supports 28, but these assembling operations are simply completed by bolting. Furthermore, the connection between the ring material 31 and the lever 27 on the nozzle vane side,
Simply connect the pin 33 on the ring material side and the U-shaped end 2 of the lever.
This is a work to engage by fitting with 71,
These assembly operations can be easily performed. Further, during operation, the rotating portion 29 is guided by the annular groove 30, and can smoothly rotate in the normal direction without causing this, allowing the nozzle vane to operate properly.

In the exhaust supercharger 10 shown in FIG. 2, the rotating part 29 is actuated by the actuator 35, but instead of this, it may be actuated by a diaphragm via a link, or by using other known means. Good too. Furthermore, the lever 27 that connects the rotating part 29 and the nozzle vane 24 side is connected to the support shaft 2 as described above.
After first attaching the lever 27 to the rotating part 29
Alternatively, the lever 27 may be attached to the support shaft after the rotating portion 29 is assembled.In either case, the assembly work is easy.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a conventional exhaust supercharger, Figure 2
The figure is a side sectional view of an exhaust supercharger as an embodiment of this invention, FIG. 3 is a sectional view taken along the - line in FIG.
The figure is a sectional view taken along the line -- in FIG. 10... Exhaust supercharger, 11... Bearing housing, 111... Outer peripheral wall, 13... Turbine housing, 15... Center shaft, 17... Turbine blade, 22... Annular inlet, 23...
Wall portion, 24... Nozzle vane, 25... Support shaft, 2
8...Ring support, 281...Circular end, 28
2... Outer end, 29... Rotating portion, 30... Annular groove, 31... Ring material.

Claims (1)

[Scope of utility model registration request] The bearing housing that pivotally supports the center shaft and the turbine housing form an annular inlet through which exhaust gas flows into the radial turbine impeller attached to the center shaft, and a wall of the bearing housing faces the annular inlet. A nozzle vane is provided at one end of each of a plurality of support shafts arranged in an annular shape passing through the center shaft so as to be oriented in the same direction as the center shaft direction, and these nozzle vanes are integrated with the other end of each of the support shafts. A lever extending in a direction substantially orthogonal to each of the support shafts is attached to each of the bearing housings, and a rotating part is attached to the annular groove formed in the outer peripheral wall of the bearing housing concentrically with the center shaft. a ring-shaped ring material having an engaging portion protruding in the same direction as the shaft direction, and in which the engaging portion communicates with a yoke portion formed at each rotating end of the plurality of levers; The outer edge is fixed,
In addition, the inner circular arc end is formed with a pair of ring supports that slide in contact with the annular groove, and by rotating the ring material, the plurality of nozzle vanes are caused to flow in an annular flow via the lever and each support shaft. An exhaust supercharger characterized by being configured to vary the opening amount of an inlet.