JPS6024717Y2 - Two-speed switching device for multi-engine propulsion plants - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-speed switching device in a multi-engine propulsion plant in which the propeller shaft is driven by a cruise engine in a low speed range and by a cruise engine and a boost engine in a high speed range.

The target engine type is, for example, a combination of either a small-capacity gas turbine or a diesel engine as a cruise engine and a large-capacity gas turbine as a first engine.

In the reduction gear of this kind of multi-model engine propulsion plant,
Generally, a cruise engine has one power transmission path, and its reduction ratio is set so that the maximum rotation speed of the cruise engine at a high speed ratio where the cruise engine and boost engine are driven simultaneously is 100% of the propeller shaft rotation speed. Therefore, as shown in Figures 1 and 2, the cruising engine output decreases approximately linearly as the main shaft rotation speed decreases, and the engine output at the upper limit of the low speed range is considerably lower than the maximum output. The drawback was that the cruise engine output could not be used effectively at low speeds.

Therefore, some proposals have been made to divide the cruise engine power transmission mechanism into a low-speed side and a high-speed side, and to increase the engine output in the low speed range by placing a friction clutch for switching in each power transmission path.

However, as shown in FIG.
．． 5 to the propeller shaft 6;
It is divided into a low-speed power transmission path from the output shaft 2 to the propeller shaft 6 via the gears 7 and 8, the intermediate shaft 9, and the gears 4 and 5, and the output shaft 2 has friction for connecting the gear 3 to the output shaft. The intermediate shaft 9 is equipped with a friction clutch 11 for connecting the gear 8 to the intermediate shaft, and the second speed switching is a clutter operation that takes the rotation speed of the propeller shaft 6 and the rotation speed of the cruise engine 1 as input signals. This is done by selectively guiding the pressure fluid from the pump 14 to the friction clutch 10 or 11 via the directional switching valve 13 operated by the switching signal of the automatic/manual circuit 12. oil passage 1
At 5° 16, accumulators 17, 18, throttle valves 19, 20, . Since the check valves 21 and 22 were interposed, a complicated hydraulic control device was required.

In view of the above-mentioned circumstances, the present invention has developed a self-periodic automatic system that mechanically engages and disengages the clutch by utilizing the relative rotational speed difference between the controlled clutch and the input and output shafts for switching between two speeds of a cruise engine. By using an engagement/disengagement clutch, it is possible to simplify the hydraulic control system of this type of multi-engine propulsion plant and reduce costs.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 4, 25 is a small-capacity gas turbine that is a cruise engine, 26 is a large-capacity gas turbine that is a boost engine, and 27 is a propeller shaft.

A pinion 29 is attached to the output shaft 28 of the cruise engine 25, and a gear 31 attached to the first intermediate shaft 30 and a gear 33 attached to the second intermediate shaft 32 are meshed with the pinion 29. There is.

The first intermediate shaft 30 includes a pinion 35 that meshes with a main gear 34 that is pivotally attached to the propeller shaft 27;
The gear 31, the clutch 36,
The pinion 35 and the main gear 34 form a low-speed power transmission mechanism, and the second intermediate shaft 32 includes a pinion 37 that meshes with the main gear 34 and a controlled clutch for attaching and detaching the pinion 37 to and from the second intermediate shaft. For example, a friction clutch 38 is provided, and the gear 33, clutch 38, pinion 37, and main gear 34 constitute a high-speed side power transmission mechanism.

The output shaft 39 of the boost engine 26 is equipped with a self-periodic automatic engagement/disengagement clutch 40 and a pinion 41 that is attached to and detached from the output shaft 39. This pinion 41 and the propeller shaft 27
The main gear 34 is composed of two gears 42, 45 and two pinions 43, 44 connected together.

Since this embodiment has the above-described configuration, in the low speed range where the cruise engine 25 is operating independently, the friction clutch 38
is disengaged, and the self-cyclic automatic engagement/disengagement clutch 36 is in the engaged state.

That is, when the cruise engine 25 is operating independently, the friction clutch 38
When disengaged, the gear 31 on the input side of the self-periodic automatic engagement/disengagement clutch 36 is driven, and the main gear 34 on the output side is stopped, so the rotation speed on the input side is higher than the output side, and the clutch 3
6 is automatically fitted.

Therefore, the cruise engine torque in the low speed range is gear 31,
The signal is transmitted to the propeller shaft 27 via the first intermediate shaft 30, clutch 36, pinion 35, and gear 34.

At high speeds where the cruise engine 25 and boost engine 26 operate in parallel, the main gear 34 is engaged by the engagement of the friction clutch 38.
is driven and a pinion 35 meshes with this main gear 34.
is faster than the gear 31, so the self-periodic automatic engagement/disengagement clutch 36 is automatically disengaged.

Thus, cruise engine torque in a high speed range is transmitted to the propeller shaft 27 via the gear 33, second intermediate shaft 32, friction clutch 38, pinion 37, and main gear 34.

As explained above, according to the present invention, the cruise engine power transmission mechanism is divided into a low speed side and a high speed side, and at the upper limit of the low speed range and the upper limit of the high speed range, the cruise engine is driven at the maximum rotation speed and maximum output is obtained. , as shown in FIGS. 1a and 2a, the cruise engine output can be maximized even in the low speed range.

Moreover, because the low-speed power transmission mechanism is equipped with a self-periodic automatic engagement/disengagement clutch, the cruising engine can be switched to two speeds by simply switching one friction clutch. One of the two hydraulic control circuits after No. 13 can be omitted, and the hydraulic control device becomes simple, which has an excellent effect of reducing the cost of this type of multi-engine propulsion plant.

It should be noted that the above drawings and descriptions are merely preferred embodiments of the present invention, and the present invention is not limited to these embodiments.

The structure of this embodiment can be modified in various ways without departing from the gist of the invention. For example, as shown in FIG.
3. The pinions 37 and 44 may be combined into one set so that the cruise engine 25 and the boost engine 26 share this set of pinions.

[Brief explanation of the drawing]

Figures 1 and 2 are propulsion performance characteristic diagrams of a cruise engine in a multi-engine propulsion plant with A dual switching and without B switching, respectively; Figure 3 is a cruise engine gear train and hydraulic circuit diagram of a conventional system; FIG. 4 and FIG. 5 are gear train diagrams of a two-speed switching reduction gear, respectively, showing an embodiment of the present invention. 25... Cruise engine, 26... Boost engine, 27... Propeller shaft, 28.3
9... Output shaft, 29, 35, 41, 43, 44
...Zenion, 30...First intermediate shaft, 3
1,33,42.45...Gear 32...
...Second intermediate shaft, 34...Old main gear, 36,40...
・Self-cycle automatic engagement/disengagement clutch, 38...Friction clutch.

Claims (1)

[Scope of utility model registration request] In a multi-engine propulsion plant where the propeller shaft is driven by a cruise engine in the low speed range and a cruise engine and a boost engine in the high speed range, the cruise engine power transmission mechanism is divided into two systems, low speed and high speed, and arranged at intervals. A self-periodic automatic engagement/disengagement clutch is provided between the input gear and the output gear of the low-speed power transmission mechanism, and a controlled clutch is provided between the input gear and the output gear of the high-speed power transmission mechanism. 2 of a multi-engine propulsion plant characterized by
Fast switching device.