JPH057464Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a variable nozzle supercharger equipped with a nozzle vane whose opening can be adjusted, and particularly relates to a support structure for a ring-shaped member that rotates the nozzle vane. .

[Prior Art] Various structures of variable nozzle superchargers have been known in the past, in which a variable nozzle vane whose opening degree can be adjusted is provided in an annular gas passage of the supercharger. (for example,
Utility Model Publication No. 58-82439). In the conventional structure,
Normally, the nozzle vane has a shaft part that is inserted into and supported by a bush provided on the center housing side, and a link mechanism that can rotate the shaft part is attached to the end of the shaft part that extends outside the housing. are connected. This link mechanism consists of a link member provided corresponding to each of a plurality of nozzle vanes arranged in the circumferential direction of the supercharger, and a ring-shaped member that rotates each link member simultaneously. is slidably and rotatably supported on a piece bearing mounted in an annular groove formed in the center housing.
By rotating this ring-shaped member, the opening degree of the nozzle vane is adjusted through the rotation of the link member and the shaft portion.

However, in the above structure,
A piece bearing is required to rotate the ring-shaped member, and there is a problem in that the number of parts increases accordingly. In addition, in order for each nozzle vane to operate smoothly, the center of the sliding surface of the piece bearing must be concentric with the center of the mounting pitch of the nozzle vane shaft, and in order to make it concentric, high-precision machining is required. The problem is that it requires

In the above-mentioned mechanism, if the length of the bearing in the shaft section is to be ensured to ensure the support of the nozzle vane, the problem arises that the bearing must be extended toward the turbine housing, and the supercharger becomes larger accordingly. .

In order to solve these problems, we developed a variable nozzle that has a small number of parts, does not require long machining time, does not require high machining accuracy, and does not make the entire turbocharger larger. A turbocharger with a supercharger has been proposed (Jetgen 60
−174897).

FIG. 4 shows the supercharger disclosed in this Utility Model Application No. 174897/1983. As shown in FIG. 4, a bush 3 supporting the shaft portion 2 of the nozzle vane 1 is made to protrude beyond the center housing 4 on the opposite side to the nozzle vane 1, and is connected to each link member 5 of the link mechanism so that each link member 5 is A ring-shaped member 6, which is actuated simultaneously, is supported on the protrusion of each bush 3 so as to be able to come into common sliding contact with the outer peripheral surface of the protrusion of each bush 3.

In the variable nozzle supercharger shown in FIG. 4, the shaft portion 2 of the nozzle vane 1 and each bush 3 are arranged in the center housing 4 concentrically with respect to the axis of the supercharger. The protrusion is also arranged concentrically with respect to the axis of the supercharger.
The ring-shaped member 6 is slidably in common contact with the outer circumferential surface of the protruding portion of each bush 3, that is, the inner circumference of the ring-shaped member 6 is connected to each bush 3. Since the ring-shaped member 6 is fitted and supported so as to circumscribe the ring-shaped member 6, the axis of the ring-shaped member naturally aligns with the axis of the supercharger by simply assembling the ring-shaped member 6. Therefore, there is no need for a piece bearing like in the conventional mechanism, and there is also no need for special machining parts or high-precision machining.

Furthermore, in order to improve the support accuracy of the shaft portion 2 of the nozzle vane 1, it is desirable to lengthen the bushes 3 to increase the bearing length of the shaft portion. Since the ring-shaped member 6 and the protrusions of each bush 3 are located on the top, the ring-shaped member 6 and the protrusions of each bush 3 are located in parallel in the axial direction of the supercharger. The axial dimension does not increase.

Another prior art related to the present invention
-74637 publication is known. The guide vanes of a turbomachine disclosed in this publication consist of a bush that supports the shafts of a plurality of guide vanes arranged equally on a circumference centered on the rotor blade axis of the turbomachine in a casing, and an outer periphery of the bush. A ring is rotatably attached to the guide vane, and the ring and a lever disposed at the end of the guide vane shaft are connected via a pin-connected link that simultaneously drives the rotation angle of the guide vane. Yes, almost the same effect as the supercharger can be obtained.

[Problems to be solved by the invention] However, the structure in which the ring-shaped member and the bushing are simply slid together, as in the structures of the above-mentioned Utility Application No. 174897-1983 and Japanese Utility Model Application No. 74637-1983, does not work. However, there is a problem in that wear on the sliding surfaces between the bush and the ring-shaped member increases. Further, in this case, the drive energy for rotating the ring-shaped member also increases, so the actuator that controls the opening degree of the nozzle vane must be made large, which poses a mounting problem. If the actuator is a diaphragm actuator that uses air pressure, there is a problem in that the responsiveness of the actuator deteriorates as the actuator becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a supercharger with a variable nozzle that can suppress the wear of a ring-shaped member and further reduce the driving energy when rotating the ring-shaped member.

[Means for Solving the Problems] A supercharger with a variable nozzle according to the present invention that meets this purpose has a plurality of rotatable nozzle vanes disposed in an annular gas passage leading from a volute chamber to a turbine wheel. In a supercharger with a variable nozzle, a shaft part of a nozzle vane is rotatably supported on a center housing side, and a link member of a link mechanism for rotating the nozzle vane is connected to an end of the shaft part, A ring-shaped member that is connected to each link member and rotates each link member at the same time is rotatably circumscribed to the shaft portion of each nozzle vane, and the rotation direction of the ring-shaped member and the rotation of the shaft portion of the nozzle vane are It consists of the same direction.

[Function] In the variable nozzle supercharger configured as described above, the ring-shaped member is supported in a state in which it is in circumscribed contact with each shaft portion of each nozzle vane. When the ring-shaped member rotates, the rotation direction of the ring-shaped member and the rotation direction of the shaft portion of each nozzle vane are in the same direction, so the relative movement distance between the two during rotation is significantly shorter than in the conventional structure. It becomes like this. Therefore, wear of the contact surface of the ring-shaped member with the shaft portion is suppressed, and the driving energy for rotating the ring-shaped member can be reduced.

[Embodiments] Hereinafter, preferred embodiments of the variable nozzle-equipped supercharger of the present invention will be described with reference to the drawings.

1 and 3 show a supercharger with a variable nozzle according to a first embodiment of the present invention. In the figure, 1
0 is a swirl chamber, 11 is a turbine wheel, and 12 is a turbine housing. The turbine housing 12 and the center housing 18 constitute an annular gas passage 14.

This annular gas passage 14 is provided with a nozzle vane 15 that adjusts the inflow speed of exhaust gas flowing into the turbine wheel 11 from the swirl chamber 10, and the opening degree of the nozzle vane 15 is adjusted by rotation. A plurality of nozzle vanes 15 are arranged concentrically with respect to the axis 16 of the supercharger. Further, the nozzle vane 15 is provided with a shaft portion 17 that can rotate integrally with the nozzle vane 15.

The shaft portion 17 extends on the opposite side from the nozzle vane 15, and that portion is rotatably supported by a bush 19 attached to the center housing 18. This bush 19 projects outward from the center housing 18 on the side opposite to the nozzle vane 15. A portion of the bush 19 that protrudes to the outside and is located outside of the bush mounting pitch circle A is cut away. In this embodiment, the cutout part 19a of the bush 19 is cut out so that half of the shaft part 17 of the nozzle vane 15 is exposed, but the cutout part 19a is formed slightly outward from the pitch circle A described above. By doing so, the substantial bearing length of the shaft portion 17 becomes longer, and it becomes possible to improve the support precision of the nozzle vane 15.

The shaft portion 17 of the nozzle vane 15 extends further outward than the protruding portion 20 of the bush 19, and a link member 22 of a link mechanism 21 for rotating the nozzle vane 15 is provided at the end of the shaft portion 17. connected. Link member 22
The shaft portion 1 corresponds to each shaft portion 17.
The same number as 7 is arranged. Each link member 22
is the second ring-shaped member 23 of the link mechanism 21.
As shown in the figure, the elongated hole 2 provided in the ring-shaped member 23
4 is connected by fitting a pin 25 provided on the link member 22 in a slidable and rotatable manner. Therefore, when the ring-shaped member 23 is rotated, each shaft portion 17 is rotated in the same direction as the ring-shaped member 23 via the elongated hole 24, the pin 25, and the link member 22.

The ring-shaped member 23 is an annular member, and has a flange 23a formed on the inner circumferential surface of the ring-shaped member 23 and extending in the axial direction of the supercharger. Ring-shaped member 23
are rotatably supported in common by the shaft portion 17 of each nozzle vane 15 exposed from the cutout portion 19 of the bush 19 and on each outer circumferential surface 17a of each shaft portion 17. That is, in the ring-shaped member 23, the inner circumferential surface 23b of the flange 23a is connected to each shaft portion 1.
It is attached so that it may circumscribe|contact each outer peripheral surface 17a of 7.

In addition, in the figure, 29 is a compressor, 30
indicates the oil outlet hole.

Next, the operation of the variable nozzle supercharger configured as described above will be explained.

Since the shaft portion 17 of the nozzle vane 15 is arranged concentrically with respect to the axis 16 of the supercharger,
The ring-shaped member 23 is simply assembled and attached to the shaft portion 1 exposed from the cutout portion 19a of each bush 19.
By simply being supported by the supercharger 7, the supercharger is naturally and precisely concentric with the supercharger axis 16. Therefore, high-precision machining is not required, and the opening degree of each nozzle vane is maintained uniformly.

Further, the ring-shaped member 23 is connected to the nozzle vane 15.
The ring-shaped member 23 is directly supported by the shaft portion 17 of the ring-shaped member 23 when the ring-shaped member 23 rotates.
The rotation direction B of the shaft portion 17 and the rotation direction C of the shaft portion 17 are the same direction, and the relative movement distance between the two is the same as that of the ring disclosed in the above-mentioned Utility Model Application No. 60-174897 and Utility Model Application No. 61-74637. Significantly smaller than the supporting structure. As a result, the sliding distance between the ring-shaped member 23 and the shaft portion 17 during rotation is reduced, and wear on the contact surface between the ring-shaped member 23 and the shaft portion 17 is also suppressed to a small level.

Therefore, the driving energy required when rotating the ring-shaped member 23 is smaller than that of the conventional support structure, and the driving capacity of the actuator (not shown) is also small.

[Effects of the invention] According to the supercharger with a variable nozzle of the invention, a ring-shaped member that is connected to each link member of the link mechanism and operates each link member simultaneously in the same direction can be rotated on the shaft portion of each nozzle vane. circumscribe as possible,
Since the direction of rotation of the ring-shaped member and the direction of rotation of the shaft portion of the nozzle vane are made to match,
The relative movement distance between the ring-shaped member and the shaft portion of the nozzle vane can be shortened. the result,
Abrasion of the contact surface between the ring-shaped member and the shaft portion can be suppressed to a small level.

Further, since the ring-shaped member and the shaft portion rotate in the same direction, the driving energy for rotating the ring-shaped member can be reduced.
Therefore, it is possible to downsize the actuator that rotates the ring-shaped member, and restrictions on mounting can be significantly eased.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of essential parts of a supercharger with a variable nozzle according to an embodiment of the present invention, and FIG. 2 is a -
A partial front view taken along the line, FIG. 3 is an overall longitudinal sectional view of the variable nozzle equipped supercharger shown in FIG. Figure. 10... Volute chamber, 11... Turbine wheel,
12... Turbine housing, 14... Annular gas passage, 15... Nozzle vane, 16... Axis center of supercharger, 17... Shaft portion, 18... Center housing, 19... Bush, 19a... Cutout part ,
21... link mechanism, 22... link member, 23
...A ring-shaped member.

Claims (1)

[Scope of utility model registration request] A plurality of rotatable nozzle vanes are arranged in an annular gas passage leading from the volute chamber to the turbine wheel, a shaft portion of the nozzle vane is rotatably supported on the center housing side, and the end portion of the shaft portion is provided with a rotatable nozzle vane. In a supercharger with a variable nozzle that connects link members of a link mechanism that rotates nozzle vanes, a ring-shaped member that is connected to each link member of the link mechanism and operates the link members simultaneously is attached to the shaft portion of each nozzle vane. A supercharger with a variable nozzle, characterized in that the ring-shaped member is rotatably circumscribed, and the rotational direction of the ring-shaped member and the rotational direction of a shaft portion of a nozzle vane are made to coincide with each other.