JPH0645634Y2 - Single shaft gas turbine engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a single-shaft gas turbine engine suitable as a vehicle engine.

(Prior Art) It is not possible to use the output of a uniaxial gas turbine as it is as a driving force of a traveling vehicle due to the characteristics of the gas turbine. Therefore, it is conceivable to decelerate the rotation of the output turbine and extract it as a driving force. As a mechanism for decelerating, a belt type continuously variable transmission mechanism can be cited. This belt type continuously variable transmission includes an input pulley that rotates by decelerating rotation of an output turbine, an output pulley connected to an output shaft, a belt wound around each pulley, and each pulley. And a hydraulic cylinder that changes the groove width according to the gear ratio. This hydraulic cylinder is driven by the rotation of a uniaxial gas turbine, and is operated by a hydraulic pump that supplies hydraulic pressure to each hydraulic cylinder via a control valve.

(Problems to be Solved by the Invention) The gas turbine driving the hydraulic pump has a problem that load is applied and fuel consumption is increased.

The present invention is a one-shaft gas turbine engine that can reduce the load required for driving the pump and improve fuel efficiency by maintaining the gear ratio of the belt type continuously variable transmission mechanism without constantly driving the hydraulic pump. For the purpose of provision.

(Means for Solving the Problems) The single-shaft gas turbine engine of the present invention includes a reduction gear train that decelerates the rotation of an output turbine, an input pulley that is driven by the reduction gear train, and an input pulley and an endless drive. A belt type composed of an output pulley connected via a belt and a pair of hydraulic cylinders provided on each of these pulleys for controlling the gear ratio of the input pulley and the output pulley by changing the hydraulic pressure applied to each pulley. A continuously variable transmission mechanism, a hydraulic pump driven by the reduction gear train, and clutch means arranged between the hydraulic pump and the reduction gear train to selectively connect and disconnect the rotation transmission of both. A control valve arranged between the hydraulic pump and the hydraulic cylinder, and an accumulator connected to the hydraulic pump via a hydraulic passage branched from the control valve. And the accumulator has a predetermined pressure, it outputs a pulley control signal for operating the control valve to supply the hydraulic pressure of the accumulator to the hydraulic cylinders and holds the clutch means in the disengaged state. When the hydraulic pressure of the accumulator falls below a predetermined value, a pump control signal for connecting the clutch means to operate the hydraulic pump is output and the hydraulic pump and the accumulator are connected. And a control means for outputting a pressure accumulation control signal to the control valve.

(Operation) When the accumulator has a predetermined pressure,
The hydraulic pressure of the accumulator is supplied to each of the hydraulic cylinders to control the belt type speed change mechanism, and the clutch means is held in the disengaged state to interrupt the rotation transmission between the hydraulic pump and the single-shaft gas turbine body.

When the hydraulic pressure of the accumulator becomes equal to or lower than a predetermined value, the clutch means is brought into contact with the hydraulic pump to operate to accumulate pressure oil in the accumulator.

(Embodiment) Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, reference numeral 1 is a uniaxial gas turbine main body, reference numeral 2 is a belt type continuously variable transmission mechanism which is rotationally driven through a reduction gear train 3, reference numeral 4 is a transmission, and reference numeral 5 is a control means including a computer. , 6 show an electromagnetic clutch as clutch means, 7 shows a hydraulic pump, 8 shows a control valve, and 9 shows an accumulator.

The single-shaft gas turbine main body 1 has a known structure including a compressor 1a, an output turbine 1b, and a rotary shaft 1c that integrally connects the compressor 1a, the output turbine 1b, and the rotary shaft 1c.
To rotate. On the extension end 1d of the rotating shaft 1c, the small diameter gear 3a
Is stuck. A large-diameter gear 3b meshes with the gear 3a, and both gears 3a and 3b form a reduction gear train 3. The reduction gear train may be composed of more gears.

The belt-type continuously variable transmission mechanism 2 includes an input pulley 21 that rotates about an input shaft 20 to which a gear 3b is fixed, an output pulley 23 that rotates about an output shaft 22, and an endless loop wound around each pulley. The belt 26, an input hydraulic cylinder 24 that changes the hydraulic pressure that acts on the input pulley 21, and an output hydraulic cylinder 25 that changes the hydraulic pressure that acts on the output pulley 23 are the main components. The input pulley 21 includes a fixed pulley 21a integrated with the input shaft 20 and a movable pulley 21b provided integrally with the input shaft 20 in the rotational direction and slidably in the axial direction. A piston rod 24a of a hydraulic cylinder 24 is connected to the movable pulley 21b. The pressure chamber 24b of the hydraulic cylinder 24 is connected to the control valve 8 by a pulley control hydraulic passage 27 having a switching valve 2a. The movable pulley 21b is provided with a spring 24c so that it can move toward the fixed pulley 21a. Output pulley 23
Is composed of a fixed pulley 23a integrated with the output shaft 22, and a movable pulley 23b provided integrally with the output shaft 22 in the rotational direction and slidably in the axial direction. The piston rod 25a of the hydraulic cylinder 25 is connected to the movable pulley 23b. The pressure chamber 25b of the hydraulic cylinder 25 is connected to the pulley control hydraulic passage 27 via the switching valve 2a. Movable pulley
23b has a spring 25c for fixing it to a fixed pulley 23a.
The movement habit of moving away from is given. The switching valve 2a outputs the control means 5 so that the pressure chambers of the hydraulic cylinders 24 and 25 communicate with the control valve 8 or the hydraulic pressure of each pressure chamber communicates with the return passage 2b for returning to the oil tank. It is selectively controlled by the control signal TC. Endless belts for the pulleys 21 and 23 are formed on the surfaces of the input pulley 21 and the output pulley 23 facing each other of the fixed pulley and the movable pulley in a tapered shape, and the distance between the fixed pulley and the movable pulley is changed by a hydraulic cylinder. It is designed to change the winding effective diameter of 26. An output gear 22a is fixed to the output shaft 22, and an input gear 4a fixed to the input shaft of the transmission 4 is fixed to the output gear 22a.
Are in constant mesh.

The drive shaft 6a of the electromagnetic clutch 6 is attached to the gear 3b of the reduction gear train 3.
The gear 6b fixed to is always meshed. The driven shaft 6c of the electromagnetic clutch acts as a drive shaft of the hydraulic pump 7.
The electromagnetic clutch 6 is a clutch that selectively connects and disconnects the hydraulic pump 7 and the reduction gear train 3, and is operated by a control signal C output from the control means 5. When the electromagnetic clutch 6 is brought into contact, the hydraulic pump 7 is driven and pressure-feeds the oil stored in an oil tank (not shown) to generate pressure oil.

The control valve 8 arranged in the pulley control hydraulic passage 27 supplies the hydraulic pressure generated by the hydraulic pump 7 to the hydraulic cylinders 24, 25, accumulates it in the accumulator 9 via the accumulator passage 9a, or returns the passage 8a. It is a valve for switching back to the oil tank via the control valve 5 and is operated by a control signal VC output from the control means 5. The accumulator 9 is provided with a pressure sensor and outputs a detection signal P corresponding to the pressure value of the stored pressure oil to the control means 5. The hydraulic pressure of the accumulator 9 is changed to the hydraulic cylinders 24 and 25.
When the hydraulic pressure is below a certain level, which is sufficient to operate
The hydraulic pump 7 is operated to accumulate the pressure oil, which will be described later.

The control means 5 includes, for example, a gear ratio signal I of the belt type continuously variable transmission mechanism 2 obtained by detecting an effective diameter winding position of the endless belt 26 with respect to the input pulley 21, a rotation speed detection signal N of the transmission 4, The vehicle speed signal V obtained from the rotation of the output shaft of the transmission or the drive shaft, and the load signal R from the load detecting means 10 such as the accelerator opening sensor or the rack position detecting sensor of the governor are input. Further, the control means 5 outputs a control signal for operating the switching valve 2a that switches the hydraulic pressure supply to the hydraulic cylinders 24, 25 of the belt type continuously variable transmission 2 in accordance with the running state of the vehicle.

The operation of the embodiment configured as described above will be described.

Now, it is assumed that the uniaxial gas turbine body 1 is operated and the accumulator 9 has accumulated a hydraulic pressure equal to or higher than a predetermined value. When the transmission is in an idle state or is traveling steadily with a partial load, the rotation of the uniaxial gas turbine body 1 is converted into a predetermined gear ratio by the belt type continuously variable transmission mechanism 2 and output to the transmission 4. In this state, the control means 5 outputs the clutch disengagement signal C to the electromagnetic clutch 6 to discontinue the transmission of the driving force to the hydraulic pump 7. Therefore, the hydraulic pump 7 is placed in an inoperative state and does not generate hydraulic pressure. Therefore, 1
Since the shaft gas turbine main body 1 is not loaded with a load for driving the hydraulic pump, fuel consumption equivalent to the load for driving the pump can be saved. In this case, the control means 5 outputs to the control valve 8 an operation signal for connecting the hydraulic pump 7 and the return passage 8a. When the uniaxial gas turn body 1 is placed in the idle state, the control means 5 takes in the load signal R, the transmission rotation signal N, the vehicle speed signal V, etc., and holds the switching valve 2a at a fixed position to hold the hydraulic cylinder 2 in place.
The gear ratio of the speed change mechanism 2 is kept constant while the hydraulic pressures of 4, 25 are kept constant.

Now, when the vehicle starts to accelerate from an idle state, or when the vehicle is running steadily with a partial load, control that incorporates various signals such as load signal R, vehicle speed signal V, transmission rotation signal N, and target shift position signal The means 5 outputs a piston control signal VC to the control valve 8 to connect the accumulator 9 to the pulley control hydraulic passage 27 and to switch the switching valve 2a to switch the hydraulic pressure accumulated in the accumulator 9 to the hydraulic cylinder 24. Supply to 25. Hydraulic cylinder 2
When hydraulic pressure is supplied to 5, the movable pulley 23b will move to the fixed pulley 23a.
By moving the movable pulley 21b of the other hydraulic cylinder 24 away from the fixed pulley 21a, the effective diameter of the endless belt 26 wound around each pulley is changed,
The gear ratio can be changed. Which of the hydraulic cylinders 24 and 25 is to be supplied with hydraulic pressure, in other words, how to select the gear ratio of the speed change mechanism 2 is determined so as to produce the most efficient gear ratio according to the driving situation. Then, the control means 5 judges and decides. The control means 5 is provided with a map having conditions such as a gear ratio, fuel consumption, and torque according to various driving situations.

Then, the control means 5, which has determined by the input of the pressure signal R that the hydraulic pressure accumulated in the accumulator 9 is not sufficient to operate the hydraulic cylinders 24, 25, outputs the pump control signal C. The electromagnetic crack 6 is operated in the contact direction to connect the drive shaft 6a and the driven shaft 6c, and the hydraulic pump 7 is rotationally driven. At the same time, the control valve 8 outputs a pressure accumulation control signal VC for switching the hydraulic passage 7a connected to the pump so as to communicate with the pressure accumulation oil passage 9a. Hydraulic pump 7
By the operation of, the pressure oil is accumulated in the accumulator 9. The hydraulic pressure of the accumulator 9 becomes sufficient and the hydraulic pressure signal P
The control means 5 to which is input outputs a control signal for disconnecting the electromagnetic clutch 6 to stop the operation of the hydraulic pump 7.

It should be noted that in an operating situation in which the gear ratio of the belt type continuously variable transmission mechanism 2 is frequently changed, the hydraulic pressure generated thereby may be sent to the hydraulic cylinders 24, 25 by continuously operating the hydraulic pump 7. Of course.

As described above, according to the single-shaft gas turbine engine of the present invention, the clutch means is provided to operate the hydraulic pump only when necessary, and the pressure oil generated at this time is accumulated in the accumulator. Since the belt type continuously variable transmission is operated, the fuel consumption required for driving the hydraulic pump can be saved and the power loss accompanying the driving of the hydraulic pump can be eliminated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... 1-axis gas turbine main body, 2 ... Belt type continuously variable transmission mechanism, 3 ... Reduction gear train, 5 ... Control means, 6 ... Clutch means, 7 ... Hydraulic pump, 8 ... Control valve, 9 ... Accumulator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-101340 (JP, A) JP-A-62-64639 (JP, A) Jikkouhei 1-444844 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A reduction gear train for decelerating the rotation of an output turbine of a single-shaft gas turbine main body, an input pulley rotatably driven by the reduction gear train, and an output pulley connected to the input pulley via a belt. A belt-type continuously variable transmission mechanism, which is provided in each of the pulleys and controls a gear ratio of the input pulley and the output pulley by changing hydraulic pressures acting on the pulleys, and the reduction gear. A hydraulic pump driven by a train, clutch means arranged between the hydraulic pump and the reduction gear train to selectively connect and disconnect the rotation transmission between the two, and the hydraulic pump and the hydraulic cylinder. A control valve arranged between the control valve and an accumulator connected to the hydraulic pump via a hydraulic passage branched from the control valve; When the data has a predetermined pressure,
In order to supply the hydraulic pressure of the accumulator to each of the hydraulic cylinders, a pulley control signal for operating the control valve is output and a pump control signal for holding the clutch means in the disengaged state is output, and the hydraulic pressure of the accumulator is set to a predetermined value. When the following occurs, a control means for outputting a pump control signal for operating the hydraulic pump by bringing the clutch means into contact therewith and outputting a pressure accumulation control signal for connecting the hydraulic pump and the accumulator to the control valve. A single-shaft gas turbine engine characterized by being equipped.