CN203067041U - Variable nozzle ring of ball type structure - Google Patents

Abstract

A variable nozzle ring with a ball-type structure, which includes blades, driven rocker arms, turbine bushes, back covers, blade seats, gaskets, drive rings, spacer sleeves and screws; the blades are provided with connecting shafts, connecting shafts It is integrally cast with the blades, and several blades are respectively installed in the blade mounting holes on the blade seat, and the driven rocker arm is welded on the other end of the connecting shaft; The distance sleeve is connected with the blade seat; there are six evenly distributed circular holes on the gasket, and spherical holes for installing balls are respectively provided at one end of the circular holes. The spherical holes are used to limit the radial movement of the balls. The gasket set On the blade seat, the balls are installed in the spherical hole on the gasket, the drive ring is installed on the blade seat, the driven rocker arms are respectively screwed into the slots provided on the drive ring, and the balls are respectively in contact with the blade seat and the drive ring.

Description

Variable nozzle ring with ball structure

technical field

The utility model relates to the technical field of turbochargers, in particular to a variable nozzle ring for turbochargers.

Background technique

As the country's energy-saving requirements and emission regulations become more and more stringent, supercharging technology has become the most effective technical measure for engines. However, the traditional turbocharger has its own insurmountable shortcomings: power response lag. Even with a highly efficient turbocharger, its power response takes more than 1.7 seconds. In addition, the traditional supercharger cannot balance the power requirements of low speed and high speed. The early supercharger did not have a bypass valve, so the problem of overcharging at high speed must be considered. The pressure curve of the supercharger has a small slope, and the gas is relatively insufficient under low-speed and small-load engine conditions, and the output torque is small; The slope of the supercharger pressure curve of the through valve is slightly larger, which increases the charging efficiency and output torque of the engine under low-speed and low-load conditions, and improves the power performance at low speeds. However, under high-speed and heavy-load conditions, the bypass Frequent opening and closing of the valve restricts the supercharger from giving full play to its supercharging capacity, which is a waste for the supercharger itself. The variable nozzle technology came into being just to solve the shortcomings of the traditional supercharger.

As an exhaust gas turbocharging system with variable supercharging capacity, variable nozzle turbocharging technology can achieve different supercharging ratios by changing the cross-sectional area of the nozzle. The low-speed torque, smoke and fuel consumption of the diesel engine with the variable nozzle turbocharging technology are significantly improved compared with the diesel engine with the ordinary turbocharger. The variable nozzle turbocharging technology also has the advantages of not having to install additional systems on the conventional exhaust gas turbocharged intercooled diesel engine, and can provide coupling conditions for high EGR rates. With the gradual improvement and perfection of the performance of vehicle diesel engines, variable nozzle turbocharging technology will be more and more applied to vehicle diesel engines.

The existing variable nozzle ring is shown in accompanying drawing 1, consists of blade 1, driven rocker arm 2, turbine bushing 3, rear cover 4, blade seat 5, spacer 6, roller 7, drive ring 8, distance sleeve 9 and screw 10 form. The gasket 6 is provided with six evenly distributed round holes 6-1 for installing the roller 7, and the roller 7 with a boss structure is installed in the round hole 6-1 on the gasket 6; the blade 1 is provided with The connecting shaft 1-1, the connecting shaft 1-1 and the blade 1 are integrally cast, a plurality of blades 1 are respectively installed in the blade mounting holes on the blade seat 5, and the driven rocker arm 2 is welded on the other end of the connecting shaft 1-1; The back cover 4 is set on the turbine bushing 3, and is connected with the blade seat 5 through the screw 10 and the distance sleeve 9 set on the screw 10, the gasket 6 is set on the blade seat 5, and the driving ring 8 is installed on the blade seat 5 Above, the driven rocker arms 2 are respectively screwed into the notches 8-1 provided on the drive ring 8, and the two end surfaces of the roller 7 are respectively in contact with the blade seat 5 and the drive ring 8.

The outer circle of the turbine bushing 3 has a section of thread that is connected with the turbine box, and the whole variable nozzle ring is fixedly installed on the turbine box by the turbine bushing 3 . When working, the driven rocker arm 2 is driven by the driving ring 8, thereby driving the vane 1 to change the cross-sectional area of the nozzle to achieve different boosting ratios.

The above structure has the following disadvantages: since the two end faces of the roller 7 are in surface contact with the blade seat 5 and the drive ring 8, the friction loss is large, and the transient response is slow, resulting in a decrease in mechanical efficiency, thereby affecting the entire variable turbocharger total device efficiency.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned deficiencies of the prior art and provide a variable nozzle ring with a ball structure, which changes the roller structure on the existing variable nozzle ring into a ball structure to reduce mechanical friction. Improve mechanical efficiency.

The technical scheme of the utility model is: a variable nozzle ring with a ball structure, which includes blades, driven rocker arms, turbine bushings, back covers, blade seats, gaskets, drive rings, distance sleeves and screws; blades There is a connecting shaft on the top, the connecting shaft and the blades are cast as one, and a plurality of blades are respectively installed in the blade mounting holes on the blade seat, and the driven rocker arm is welded to the other end of the connecting shaft; the back cover is set on the turbine bushing, and It is connected to the blade seat through screws and distance sleeves set on the screws; there are six evenly distributed round holes on the gasket, and one end of the round holes is respectively provided with spherical holes for installing balls, and the spherical holes are used to limit the balls. The radial movement of the gasket is set on the blade seat, the ball is installed in the spherical hole on the gasket, the driving ring is installed on the blade seat, the driven rocker arm is respectively screwed into the notch set on the driving ring, and the ball is respectively connected to the The vane seat is in contact with the drive ring.

The outer circle of the turbine bushing has a section of thread connected with the turbine box, and the entire variable nozzle ring is fixedly installed on the turbine box through the turbine bushing. When working, the driven rocker arm is driven by the driving ring, thereby driving the blades to change the cross-sectional area of the nozzle to achieve different boosting ratios.

Compared with the prior art, the utility model has the following characteristics:

The variable nozzle ring provided by the utility model changes the roller structure on the existing variable nozzle ring into a ball structure, so that the contact between the ball, the blade seat and the drive ring becomes the contact between the spherical surface and the plane, which is equivalent to point contact. Therefore, the friction loss between the original roller, the vane seat and the driving ring is effectively reduced, the transient response is improved, and the total efficiency of the variable turbocharger is increased.

The detailed structure of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Accompanying drawing 1 is the structure diagram of existing variable nozzle ring;

Accompanying drawing 2 is the left view in accompanying drawing 1;

Accompanying drawing 3 is the gasket structure schematic diagram in the existing variable nozzle ring;

Accompanying drawing 4 is A-A sectional view among accompanying drawing 3;

Accompanying drawing 5 is the structural representation of the utility model;

Accompanying drawing 6 is the left view among accompanying drawing 5;

Accompanying drawing 7 is the improved gasket structure schematic diagram;

Accompanying drawing 8 is B-B sectional view among accompanying drawing 7.

Detailed ways

A variable nozzle ring with a ball-type structure, which includes blades 1, driven rocker arms 2, turbine bushings 3, rear covers 4, blade seats 5, gaskets 6, drive rings 8, distance sleeves 9 and screws 10; The blade 1 is provided with a connecting shaft 1-1, and the connecting shaft 1-1 is integrally cast with the blade 1. Ten blades 1 are respectively installed in the blade mounting holes on the blade seat 5, and the driven rocker arm 2 is welded on the connecting shaft 1-1. The other end of 1; the back cover 4 is set on the turbine bushing 3, and is connected with the blade seat 5 through the screw 10 and the distance sleeve 9 set on the screw 10; the gasket 6 is provided with six uniformly distributed round holes 6-1, one end of the round hole 6-1 is provided with a spherical hole 6-2 for installing the ball 11, the spherical hole 6-2 is used to limit the radial movement of the ball 11, and the gasket 6 is set on the blade seat 5 , the ball 11 is installed in the spherical hole 6-2 on the gasket 6, the driving ring 8 is installed on the blade seat 5, the driven rocker arm 2 is respectively screwed into the notch 8-1 provided on the driving ring 8, and the ball 11 They are in contact with the vane seat 5 and the drive ring 8 respectively.

Claims (1)

1. A variable nozzle ring of ball type structure, which includes blades, driven rocker arms, turbine bushings, rear covers, blade seats, spacers, drive rings, distance sleeves and screws; the blades are provided with connecting shafts, The connecting shaft and the blades are cast as a whole, and a plurality of blades are respectively installed in the blade mounting holes on the blade seat, and the driven rocker arm is welded on the other end of the connecting shaft; The distance sleeve on the upper part is connected with the blade seat; its characteristic is that six evenly distributed round holes are set on the gasket, and one end of the round holes is respectively provided with spherical holes for installing balls, and the spherical holes are used to limit the diameter of the balls. To move, the gasket is set on the blade seat, the ball is installed in the spherical hole on the gasket, the driving ring is installed on the blade seat, the driven rocker arm is respectively screwed into the notch set on the driving ring, and the ball is respectively connected to the blade seat. contact with the drive ring.

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