JP2534559Y2 - Gear device for driving supercharger in turbo compound engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger driving gear device for a turbo compound engine, and more particularly, to a supercharger for controlling a supercharger in an engine driving mode, a turbo compound mode and a full turbo mode according to the conditions required for the engine. The present invention relates to a supercharger driving gear device having a function of switching between three operation modes.

The present invention can be widely applied to two-cycle and four-cycle internal combustion engines used for general vehicles, cargo handling vehicles, construction machinery, special vehicles, ships and the like.

[0003]

2. Description of the Related Art Conventionally, a turbo compound engine as shown in FIG. 3 has been proposed. Exhaust gas discharged from an exhaust pipe 19 of an engine 10 is guided to a turbine 16 of an exhaust turbocharger 17, whereby The compressor 15 is driven to pressurize the intake air. The intake air temperature has risen by pressure after being cooling by the charge air cooler 18, the air supply pipe 11
Through the engine 10.

Further, the turbine 1 of the exhaust turbocharger 17
A low-pressure recovery turbine 14 is provided downstream of the turbine in order to recover the energy of the exhaust gas that has exited the engine 6. The low-pressure recovery turbine 14 is mechanically connected to the crankshaft 12 of the engine 10 via a reduction gear train 13. By coupling, the exhaust energy is effectively recovered by the low-pressure recovery turbine 14 and the performance of the engine is improved.

[0005]

By the way, in the conventional turbo compound engine as described above, since the recovery turbine has a low pressure, the outer diameter of the turbine becomes large, and a pipe is provided between the exhaust turbocharger and the recovery turbine. Need
The engine body cannot be made lightweight and compact.

Further, since the recovery turbine is located downstream of the exhaust turbocharger, the downstream side of the exhaust turbocharger is throttled, and the exhaust turbocharger has poor blow-up under transient load conditions. Poor transient characteristics.

[0007] Further, mechanical drive supercharging and turbo compound supercharging can be performed, but mechanical drive supercharging, full turbo supercharging, and turbo compound supercharging are performed so that good engine performance can be exhibited over a wide range of engine speeds and loads. Supercharged 3
There is a problem that mode supercharging cannot be performed.

The present invention seeks to solve such a problem, and in a turbo compound engine,
In order to select the optimal supercharging mode according to the wide speed and load conditions of the engine, a clutch that performs intermittent operation according to a control signal is inserted into the gear train, and the drive It is an object of the present invention to provide a supercharger driving gear device in a turbo compound engine which is reduced in weight and size by providing two one-way clutches in order to achieve the conflict.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a turbocharger driving gear device in a turbo compound engine according to the present invention comprises an exhaust turbocharger and a turbocharger in a turbo compound engine. interposed the formic between the crankshaft axis and the turbocompound engine of the machine
It includes a gear device consisting Ya column, the gear device, the first
Supported rotatably about an intermediate axis and a first intermediate axis.
The power transmission path between the exhaust turbocharger and the crankshaft can be intermittently interposed between the first gears.
And clutches for moving the second intermediate shaft and the second intermediate shaft
Interposed between a second gear rotatably supported therearound
A first one-way clutch capable of transmitting power from the crankshaft to the exhaust turbocharger when activated, and a first one-way clutch disposed on a common axis with the first one-way clutch;
Rotatable about the second intermediate axis and the second intermediate axis.
Operating interposed between the third gears supported by the power
A second one-way clutch capable of transmitting power from the exhaust turbocharger to the crankshaft, and a sensor for detecting an operating state of the turbo compound engine. a controller capable of outputting a control signal to the clutch Ru have <br/> provided.

[0010]

The above-described operation of the supercharger driving gear device in the turbo compound engine according to the present invention has the following effects. (1) A so-called mechanical drive mode for mechanically driving the exhaust turbocharger from the engine via a gear device by connecting a clutch, and collecting excess energy of the exhaust turbocharger to the engine via the gear device. The exhaust turbocharger can be operated in a so-called turbo compound mode.

(2) By disengaging the clutch, it is possible to operate in a so-called full turbo mode in which there is no mechanical connection between the exhaust turbocharger and the engine.

(3) The operation of the exhaust turbocharger in each of the above modes can be controlled according to the conditions required for the engine by performing the engagement / disengagement of the clutch by the engine control signal. .

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a gear unit for driving a supercharger in a turbo compound engine according to an embodiment of the present invention. FIG. 1 is a side view of a reduction gear unit, and FIG.

The gear device of this embodiment is also interposed between an exhaust turbocharger of a turbo compound engine having the same configuration as shown in FIG. 3 and a crankshaft of the engine. The supercharger gear 1 on the shaft 31 and the crown gear 20 on the engine crankshaft 36 are connected via a reduction gear train composed of gears 2 to 9.

That is, a gear 3 having a smaller diameter than the gear 2 is mounted on a first intermediate shaft 32 to which a gear 2 meshing with the gear 1 is mounted via a clutch 21, and meshes with the gear 3 with a larger diameter than the gear 3. Second intermediate shaft 33 to which the gear 4 is attached
Gears 5 and 6 having a smaller diameter than the gear 4 are mounted via first and second one-way clutches 22 and 23.

The gear 5 is mounted on the fourth intermediate shaft 35 via the gear 7 mounted on the third intermediate shaft 34.
, And the gear 6 is configured to mesh with the crank gear 20 .

Further, a gear 9 meshing with the crank gear 20 is mounted on the fourth intermediate shaft 35.

Reference numerals 38 and 39 in FIG. 2 denote rotary pickups, and reference numerals 38a and 39.
a indicates a cable for transmitting detection signals of the rotary pickups 38 and 39 to the controller 37.

The clutch 21 interposed between the first intermediate shaft 32 and the gear 2 operates in an operating state of the engine and the exhaust turbocharger, that is, in a mechanical drive mode in which the engine drives the exhaust turbocharger. , the use of mechanical bonding state without full three modes the engine turbo mode during a turbocompound modes turbine exhaust energy formic is recovered from the exhaust turbocharger to the engine side, the engine and the exhaust turbocharger The controller 37 (built-in microcomputer) selects a desired state corresponding to the engine speed, the fuel injection amount, the compressor outlet pressure, and the like from among three modes. ,
In response to a control signal from the clutch connection / disconnection drive circuit 37a, a clutch connection / disconnection actuator (not shown) is operated to connect / disconnect the clutch 21.

[0020] The first one-way clutch 2 2 at the time it is gear 5 by remote high-speed rotation of the second intermediate shaft 33 enters an idling state, during high-speed rotation than the second intermediate shaft 33 toward the gear 5 It is configured to be able to transmit torque. One <br/> or Liwa down way clutch 2 2, power transmission from the gear 5 side to the second intermediate shaft 33 side is performed, but the second intermediate shaft 33
Power is not transmitted from the side to the gear 5 side . On the other hand, the second one-way clutch 23
The gear 6 is empty when rotating at a higher speed than the second intermediate shaft 33.
And the second intermediate shaft 33 is higher than the gear 6.
It is configured to be able to transmit torque during high-speed rotation.
That is, the one-way clutch 23 is connected to the second intermediate shaft 33 side.
Power is transmitted from the gear 6 to the gear 6 side,
2 does not transmit power to the intermediate shaft 33 side.
ing.

Therefore, the first one-way clutch 2
2, power is transmitted from the crankshaft 36 to the supercharger gear 1, and the second one-way clutch 23
Power transmission from the supercharger gear 1 to the crankshaft 36 can be performed.

In the above-described configuration, at the time of mechanical drive supercharging,
Gears 9, 8, 7, 5, 4, 3, 2 from crank gear 20
The supercharger gear 1 of the exhaust turbocharger is driven via the. At this time, the clutch 21 is connected by a command from the controller 37.

On the other hand, while the one-way clutch 22 transmits the driving force of the gear 5 to the second intermediate shaft 33, the coaxial one-way clutch 23 has the gear 6 driven by the crank gear 20, and the gear 6 is driven by the second gear. Since the rotation speed of the second intermediate shaft 33 is higher than that of the second intermediate shaft 33, the idle shaft is in the idle state.

During full turbocharging, the clutch 21 is disengaged and the exhaust turbocharger enters an automatic supercharging state.

Further, at the time of turbo compound supercharging,
The clutch 21 is connected, and the surplus exhaust energy of the exhaust turbocharger is recovered. At this time, one way clutch 22
Is set so that the rotation of the second intermediate shaft 33 is faster than the rotation of the gear 5 and becomes idle, but the one-way clutch 23 is connected when the second intermediate shaft 33 rotates faster than the gear 6. the gear 6 the second intermediate shaft 33 becomes
Because it is set to be more driven, the crank gear rotational energy of the exhaust turbocharger with gear 6 20
Will be collected by the organization.

As described above, in the case of this embodiment, the exhaust turbocharger can be operated in a so-called mechanical drive mode in which the exhaust turbocharger is mechanically driven by the engine via the gear device. It is also possible to operate in a so-called turbo compound mode in which the surplus energy of the exhaust turbocharger turbine is recovered to the engine via a gear device.

Further, by disconnecting the clutch provided in the gear device, the exhaust turbocharger can be operated in a so-called full turbo state without mechanical coupling with the engine.

That is, in this embodiment, the on-off clutch inserted into the gear device is disengaged by the engine control signal, so that the operation of the exhaust turbocharger in the above three operation modes is necessary for the engine. It can be controlled according to conditions.

Further, since the low-pressure recovery turbine is not required unlike the conventional example, the engine can be made compact.

[0030]

As described in detail above, the following effects and advantages can be obtained by the supercharger driving gear device in the turbo compound engine of the present invention. (1) The exhaust turbocharger can be operated in three operation modes of mechanical drive supercharge, full turbocharge, and turbo compound supercharge by connecting and disconnecting the clutch according to the conditions required for the engine. I can do it. As a result, the following effects can be obtained. (A) By setting the exhaust turbocharger to a mechanical drive supercharging operation mode, it is possible to improve the starting acceleration as a vehicle engine. (B) By setting the exhaust turbocharger to a turbo compound supercharging operation mode in a medium to high speed and high load range, it is possible to reduce fuel consumption and increase output. (C) By setting the exhaust turbocharger to the full turbocharged operation mode in the rotational speed and load range where the supercharging conditions (a) and (b) are disadvantageous to the engine characteristics in terms of performance, the above (a) ), (B) can cover the disadvantage of the supercharging condition. (2) Since a normal exhaust turbocharger can be used as it is, the power transmission mechanism including the exhaust turbocharger can be made lightweight and compact, and the mechanical efficiency during power transmission can be improved. (3) Since the low-pressure recovery turbine in the conventional example is not required, the engine can be made compact.

[Brief description of the drawings]

FIG. 1 is a front view showing a supercharger driving gear device in a turbo compound engine as one embodiment of the present invention.

FIG. 2 is an expanded view of the same.

FIG. 3 is a schematic side view of a conventional turbo compound engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supercharger gear 2-9 Gear 10 Crown gear 21 Clutch 22 First one-way clutch 23 Second one-way clutch 32-35 Intermediate shaft 36 Crankshaft

Claims (1)

(57) [Scope of request for utility model registration] In a turbo compound engine, an exhaust turbocharger, a gear interposed between a shaft of the exhaust turbocharger and a crankshaft of the turbo compound engine.
And a gear device comprising a plurality of gear trains.
Supported rotatably about an intermediate axis and the first intermediate axis.
The first is interposed between the gears of the exhaust turbo supercharger that
The power transmission path between the shaft and the crankshaft can be interrupted
An actuating clutch, a second intermediate shaft and a second intermediate
Interposed between second gears rotatably supported about an axis
A first one-way clutch capable of transmitting power from the crankshaft to the exhaust turbocharger by operating the first one-way clutch; and a first one-way clutch disposed on a common axis with the first one-way clutch.
Rotatable about the second intermediate axis and the second intermediate axis.
Operating interposed between the third gears supported by the power
A second one-way clutch capable of transmitting power from the exhaust turbocharger to the crankshaft, and a sensor for detecting an operation state of the turbo compound engine. A supercharger driving gear device for a turbo compound engine, comprising: a controller capable of outputting a control signal to a clutch.