JPS6231633Y2 - - Google Patents

Description

[Detailed explanation of the invention] In a conventional turbocharged engine,
A small-capacity turbine is used to improve torque in the low rotation speed range. However, since this turbine has a small capacity, when the engine speed increases and the exhaust gas pressure increases, the turbine overspeeds. Therefore, a waste gate is installed on the turbine, and when the exhaust gas pressure exceeds a certain level, a part of the exhaust gas is removed. It was released into the atmosphere without passing through a turbine. For this reason, the first
As shown by the broken line in the figure, there were problems in that exhaust gas energy could not be recovered sufficiently in the high engine speed range, and torque was not sufficiently increased.

The present invention solves the above problems, and includes an exhaust turbine of a turbocharger whose exhaust inflow side is connected to the exhaust manifold of the engine body, and an exhaust inflow side connected between the exhaust manifold and the inflow side of the exhaust turbine. A variable capacity output turbine, a transmission mechanism that connects the blade axle of the output turbine and the output shaft of the engine main body, and a guide vane provided on the exhaust inflow side of the output turbine to control the exhaust gas pressure of the engine main body, the intake air pressure, It has a drive mechanism that changes the nozzle nozzle area formed by the guide vane by rotating it according to the rotation speed, load, etc. The present invention relates to a turbo compound engine with a turbocharger, characterized in that the drive mechanism is configured to operate so that the area of the ejection port increases under load. Therefore, when the exhaust gas pressure, intake air pressure, rotational speed, load, etc. of the engine body are small, the guide vane is rotated by the drive mechanism, reducing the injection opening area of the nozzle formed by the guide vane, and increasing the output power of the turbine. It is possible to reduce the amount of exhaust gas flowing into the engine, and to send enough exhaust gas to the exhaust turbine of the turbocharger to obtain the supercharging effect of the turbocharger. In addition, when the exhaust gas pressure, intake air pressure, rotation speed, load, etc. of the engine body increase, the guide vane is rotated by the drive mechanism to increase the nozzle injection port area, allowing excess exhaust gas to flow into the exhaust turbine of the turbocharger. This system prevents the turbocharger from being damaged, and also allows the excess exhaust gas to flow into the output turbine, causing the turbine to rotate, and transmitting this rotational force to the output shaft via the transmission mechanism, so the excess exhaust gas energy is absorbed. Since it can be recovered, it is possible to increase the output at high engine speeds.

An embodiment of the present invention will be described in detail below. In Figures 2 to 4, the engine body 1 of a turbo compound engine with turbocharger is shown.
has an intake manifold 2 and an exhaust manifold 3. The small-capacity turbocharger 4 has a compressor 5 and an exhaust turbine 6. The discharge side of the compressor 5 is connected to the intake manifold 2, and the inflow side of the exhaust turbine 6 is connected to the exhaust manifold 3. The output turbine 7 is of a variable capacity type and is connected to the exhaust manifold 3 on the inflow side. Further, as shown in FIGS. 3 and 4, this output turbine 7 is composed of a casing 8, guide vanes 9, blades 10, a blade axle 11, a lever 12, and an operating ring 13.
A blade 10 is provided on the circumferential surface at the center of the spiral casing 8.
A wing axle 11 on which the blade axle 11 is planted is supported.
The guide vane 9 is fixed to a pin 22 that is pivotally supported on the casing 8 on the outer periphery of the casing 8 . The portion of the pin 22 that protrudes to the outside of the casing 8 is pivotally connected to one end of the lever 12, as shown in FIG. A long hole 14 is formed at the other end of the lever 12. The actuating ring 13 has protrusions arranged at equal intervals on its circumference, and these protrusions are movably inserted into the elongated hole 14. Further, the operating ring 13 is formed to be rotatable about the blade axle shaft 11 by a guide mechanism (not shown). The drive mechanism 15 includes a rod 16 whose one end is pivotally supported by the actuation ring 13, a diaphragm 17 fixed to the other end of the rod 16, a pressure responsive chamber 18 which is separated from the atmosphere by the diaphragm 17 and to which the pressure of the exhaust manifold 3 is transmitted.
and a spring 19 that biases the diaphragm 17 to the left in FIG. A gear train 20 consisting of two sets of gears connects the blade axle shaft 11 and the output shaft 21 of the engine main body 1, and reduces the rotation speed of the blade axle shaft 11 and transmits the rotation to the output shaft 21. With the above structure, when the engine is operated with full load and the engine speed is low, the gas pressure discharged to the exhaust manifold 3 is low, so the pressure response chamber 18 becomes low pressure, and the spring 1
Due to the biasing force 9, the diaphragm 17 moves to the left from the state shown in FIG. Therefore, the actuation ring 13
rotates counterclockwise to rotate the lever 12 and tilt the guide vane 9. Therefore, the outlet area of the nozzle formed by the adjacent guide vanes 9 is reduced and almost blocked, and the exhaust gas is not sent to the blades 10 of the power turbine 7. Therefore, all of the exhaust gas from the exhaust manifold 3 is guided to the exhaust turbine 6 of the turbocharger 4, which rotates the exhaust turbine 6, rotates the compressor 5, performs turbocharging, and obtains a large torque.

In addition, when the engine speed increases and exceeds point A in FIG. 1, the exhaust gas pressure increases, and the pressure response chamber 18
The diaphragm 17 is biased by the spring 1
4 against the rotation of the actuation ring 13, the guide vanes 9 rotate clockwise. As a result, the nozzle opening formed by the guide vanes 9 opens, and the area of the opening increases with the increase in engine speed. As a result, the blades 10 of the power turbine 7
Exhaust gas is sent to the impeller shaft 11 to rotate it, and the rotational force is transmitted to the output shaft 21 via the gear train 20, increasing the torque at rotation speeds above point A as shown by the solid line in FIG.

Therefore, since the capacity of the turbocharger is small, a sufficient turbocharge effect can be obtained when the exhaust gas pressure is low, at low speeds, and at low loads, and at high exhaust gas pressures, high speeds, and high loads, the turbocharger 4 has no excess Since the exhaust gas is guided to the output turbine 7 and the exhaust gas energy is recovered, torque can be increased even in the high rotation and high load range. In the above embodiment, the actuation ring 13 is controlled by the exhaust gas pressure, but it may also be controlled by the pressure of the intake air supplied to the intake manifold 2, the engine speed, the load, etc. be.

[Brief explanation of drawings]

Fig. 1 is a graph showing engine torque per revolution, Fig. 2 is a schematic diagram showing an embodiment of the present invention, Fig. 3 is a sectional view of the output turbine 3 of the above embodiment, and Fig. 4 is the above output power. FIG. 3 is a front view of the turbine 3. FIG. 1...Engine body, 4...Turbocharger, 7...Output turbine, 9...Guide vane,
10... Vane, 11... Blade axle, 13... Operating ring, 15... Drive mechanism, 20... Gear train, 21
...Output shaft.

Claims (1)

[Scope of utility model registration request] An exhaust turbine of a turbocharger whose exhaust inflow side is connected to the exhaust manifold of the engine body, a variable capacity output turbine whose exhaust inflow side is connected between the exhaust manifold and the inflow side of the exhaust turbine, and blades of the output turbine. A transmission mechanism that connects the axle and the output shaft of the engine body, and a guide vane provided on the exhaust inflow side of the output turbine are connected to the exhaust gas pressure of the engine body,
It has a drive mechanism that rotates according to intake air pressure, rotational speed, load, etc. to vary the nozzle nozzle nozzle area formed by the guide vane, so that the nozzle nozzle area decreases when the engine is at low speed and low load. To,
A turbo compound engine with a turbocharger, characterized in that the drive mechanism is configured to operate so that the area of the ejection port increases at high speeds and high loads.