JPH0435543Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a fluid coupling for an engine for exhaust energy recovery, and more specifically, it is designed to achieve high transmission efficiency while satisfying the original function of a fluid coupling. The present invention relates to a fluid coupling for an exhaust energy recovery engine configured as follows.

[Prior art]

Conventionally, in a turbo compound engine in which a crankshaft and an exhaust energy recovery turbine are connected by a gear reduction mechanism, it has been essential to provide a fluid coupling to the gear reduction mechanism for the following reasons. That is, (1) Protection of various parts by absorbing excessive torque when starting and stopping the engine.

(2) Absorption of torsional vibration between the exhaust energy recovery turbine and the crankshaft.

Therefore, it has been proposed in the past to provide an electromagnetic clutch in a gear reduction mechanism that connects the crankshaft and the exhaust energy recovery turbine (Japanese Utility Model Publication No. 55-97133). However, in the case of conventional clutches like this, the efficiency inevitably decreases due to slippage at the point where the highest transmission efficiency is desired, and the decrease in efficiency here also reduces the efficiency of the turbo compound engine. As a result, there has been a demand for highly efficient fluid couplings.

Therefore, rubber couplings and various types of flexible couplings have been considered in the past, but because the range of rotation speeds that can be used is extremely wide due to size restrictions, the level of vibration absorption varies greatly. There were problems in that there were resonance points of many orders, and that the protection function of various parts was lost due to excessive torque.

[Purpose of invention]

This invention was devised by focusing on the problems of the conventional technology, and its purpose is to satisfy the function of the liquid coupling installed in the gear reduction mechanism that connects the crankshaft and the exhaust energy recovery turbine. The present invention provides a fluid coupling for an engine for exhaust energy recovery, which can achieve high transmission efficiency.

[Structure of the idea]

A fluid coupling for an engine for exhaust energy recovery according to the present invention to achieve the above object includes a fluid coupling disposed in a reduction mechanism that connects a crankshaft and a turbine for exhaust energy recovery, and a fluid coupling for a driven part of the fluid coupling. A plurality of centrifugal lock mechanisms are provided, one end of which is swingably pivoted to a flange provided on the rear side of the turbine, and the other end of which is provided with an inertial mass, and which are opposed to the lock mechanism of the outer case of the fluid coupling. It has a structure in which a clutch member is attached to the inner peripheral surface via a vibration absorbing damper.

[Example of idea]

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 1 shows a schematic diagram of a turbo compound engine in which this invention has been implemented. 1 is an engine, 2 is an intake manifold, 3 is an exhaust manifold, and 4 is an exhaust turbo supercharger. The exhaust manifold 3 is an exhaust turbo supercharger. It is connected to a turbine 4a of a feeder 4, and the intake manifold 2 is connected to a compressor 4c of an exhaust turbo supercharger 4 via an intake pipe 2a.

The downstream side of the turbine 4a is connected via an exhaust pipe 5 to an exhaust energy recovery turbine 6 (power turbine) equipped with rotary blades similar to the turbine 4a. The downstream side is connected to a silencer (not shown) or the like through an exhaust pipe 7, so that the exhaust gas is discharged into the atmosphere.

Further, the rotational force of the rotating shaft 6a of the exhaust energy recovery turbine 6 is extracted to the outside by a power extraction device (not shown), and the rotational driving force is transmitted to the crankshaft 9 of the engine 1 via the gear reduction mechanism 8. is configured to be

In the middle of the gear reduction mechanism 8, there is a fluid coupling 1.
As shown in FIGS. 2 and 3, this fluid coupling 10 connects an outer case 12 and a drive turbine 13a to a drive shaft 11 of a gear mechanism 8a on the drive side connected to the crankshaft 9 side. is connected to the driven shaft 14 of the gear mechanism 8b on the driven side which is also connected to the rotating shaft 6a of the exhaust energy recovery turbine 6, and a driven turbine 13b is disposed facing the driving turbine 13a. has been done. A damper 15 equipped with rubber for vibration absorption and a clutch member 16 are mounted on the inner wall surface of the outer case 12 that covers the driven turbine 13b. A plurality of centrifugal lock mechanisms 18 mounted on the side flange 17 of the driven turbine 13b face the clutch surface 16a of the clutch member 16 at predetermined intervals. The inertial mass 20 is swingably supported about the fulcrum 19, and the spring 21 constantly biases the inertial mass 20 against the driven turbine 13b.

The fluid coupling 10 according to this invention is configured as described above, and operates in the rotation range (low speed range) where the torsional vibration and speed fluctuation rate of the crankshaft 9 is large, starting, stopping,
When excessive torque is applied such as sudden acceleration/deceleration, it acts as a fluid coupling 10.

In addition to the above, in other words, in the steady operating range of medium to high speed rotation of the engine 1 in which it is desired to exhibit the most effect as a turbo compound engine, the lock mechanism 18 acts by inertial force and the inertial mass 2
0 slips and elastically contacts the clutch surface 16a of the clutch member 16 mounted inside the damper 15, thereby locking the fluid coupling 10.

Furthermore, when excessive torque is input, the lock mechanism 18 is released and the relative slippage of the input and output shafts is absorbed by the original fluid coupling 10, thereby protecting the lock mechanism 18, etc., including the damper 15. It is something to do.

As described above, in the high-speed side part within the steady operation range, the driving side and the driven side are integrated by the fluid coupling 10, and the vibrations and excessive torque at the time of locking are absorbed, so that the power The efficiency of the transmission mechanism can be improved.

[Effect of idea]

The fluid coupling of the exhaust energy recovery engine of the present invention includes a fluid coupling disposed in the reduction mechanism that connects the crankshaft and the exhaust energy recovery turbine, and a fluid coupling provided on the back side of the driven turbine of the fluid coupling. A plurality of centrifugal locking mechanisms each having one end pivotally attached to the flange and having an inertial mass at the other end are provided, and a vibration absorbing damper is provided on the inner circumferential surface of the outer case of the fluid coupling facing the locking mechanism. Since the clutch member is attached through the
The following effects can be achieved.

When excessive torque is applied such as in the rotation range (low speed range) where the crankshaft has torsional vibration and speed fluctuation rate, starting, stopping, sudden acceleration/deceleration, etc., it can be used as a fluid coupling to absorb the relative slippage of the input and output shafts. In the steady operation range of medium to high speed rotation, the locking mechanism acts by inertia force and can lock this fluid coupling, so the transmission efficiency of the recovered exhaust energy can be improved compared to conventional systems that do not have this device. This can be improved by about 15% compared to other engines.

Furthermore, since the clutch member is simply attached to the inner peripheral surface of the outer case at the rear side of the driven turbine via a vibration absorbing damper,
Improvements can be easily made without making any changes to the main components of conventional fluid couplings, such as the turbine section.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a turbo compound engine implementing the present invention, Figure 2 is a sectional view of a fluid coupling,
FIG. 3 is an enlarged sectional view of the locking mechanism portion of FIG. 2. 6... Exhaust energy recovery turbine, 8... Speed reduction mechanism, 9... Crankshaft, 10... Fluid coupling, 12... Outer case, 15... Damper, 16... Clutch member, 17... Side flange , 18... lock mechanism, 20... inertial mass.

Claims (1)

[Scope of utility model registration request] A fluid coupling is disposed in the speed reduction mechanism that connects the crankshaft and the exhaust energy recovery turbine, and one end of the fluid coupling is pivotally attached to a flange provided on the back side of the driven turbine, and the other Exhaust energy recovery in which a plurality of centrifugal lock mechanisms each having an inertial mass at the end are provided, and a clutch member is attached via a vibration absorbing damper to the inner peripheral surface of the outer case of the fluid coupling facing the lock mechanism. Fluid couplings for engines.