JPH0542453Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an operation reaction force generating device for obtaining an operation reaction force of a brake lever in a flight simulator.

[Prior Art] FIG. 2 is a configuration diagram of an operation reaction force generating device for a rotor brake lever in a helicopter flight simulator. In Figure 2, 1
2 is a rotor brake lever for operating the lever, 2 is a brake simulator that is directly connected to the rotor brake lever 1 and converts the rotation of lever 1 into a linear movement and changes in hydraulic pressure, 3 is a hydraulic pressure change in the rotor brake simulator 2 4 is a first cylinder connected to the brake simulating device 2 via a pipe 3;
6 is a first piston arranged in the first cylinder 4 to receive hydraulic pressure from the pipe 3; 6 is a first spring disposed in an air chamber separated by the piston 5 and resists the hydraulic pressure; 7; 8 is a first stopper, 8 is a second cylinder, 9 is a second piston, and 10 is a second spring, which has a spring constant larger than that of the first spring 6. 11 is a second stopper, 12 is an oil tank for supplying oil to the brake simulator 2, 13 is an adjustment valve for adjusting the amount of oil supplied, and 14 is a pressure gauge for indicating the oil pressure in the pipe 3.

In the above configuration, the rotor brake lever 1
When operated, the brake simulator 2 compresses the oil in the pipe 3, which is transmitted to the oil in the first and second cylinders 4 and 8, and attempts to compress the first and second springs 6 and 10. Then, since the spring constant of the first spring 6 is small, it starts to be compressed first and moves the first piston 5 while applying a reaction force to the brake lever 1, and stops when it hits the first stopper 7. Next, brake lever 1
When the brake lever 1 continues to be operated, the second piston 9 begins to move, and the second spring 10 compresses while applying a larger reaction force to the brake lever 1. The forces of the first and second springs 6 and 10 compressed in this manner are obtained as an operation reaction force on the rotor brake lever 1. The operator can experience the sensation of the operation reaction force based on the indication of the pressure gauge 14 and the operation amount (angle) of the rotor brake lever 1.

[Problems to be solved by the invention] In the conventional operation reaction force generating device, oil flows into the cylinders 4 and 8 by operating the rotor brake lever 1, and the operation reaction force is generated by the compression force of the springs 6 and 10. I was getting . The relationship between the amount of operation of the lever 1 and the compression is uniquely controlled by the springs 6 and 10. However, when the brakes are operated, the oil pressure of the pistons 5, 9 in the cylinders 4, 8 becomes higher than the air pressure, so oil leaks into the air chamber from the gap between the pistons 5, 9 and the cylinders 4, 8, and as a result, the brake lever 1 A problem occurred when the neutral point shifted and the pressure change characteristics changed. Also, due to the frictional force generated inside the cylinders 4 and 8,
I felt something was wrong with the simulation of the operation reaction force.

[Means for Solving the Problems] The operation reaction force generating device according to the present invention is connected to a brake simulating device that simulates a brake operation and changes the amount of operation into hydraulic pressure, and the brake simulating device via a pipe. A cylinder, a piston located in the cylinder and receiving changes in hydraulic pressure caused by a brake device from one direction of the cylinder, and an accumulator located in the other direction of the cylinder and applying hydraulic pressure to the piston from the other direction of the cylinder. This is a characteristic feature.

[Effect]

According to this invention, the hydraulic pressure from the brake lever and the hydraulic pressure from the accumulator are applied from both sides of the piston to reduce the difference in pressure between them, and the hydraulic pressure from the accumulator is used to generate the operation reaction force.

[Embodiment] FIG. 1 is a block diagram of an embodiment of this invention. Reference numeral 1 indicates a brake lever for operating the lever, which is assumed to be a rotor brake lever of a helicopter. 15 is a first accumulator, which is connected to the cylinder 4. One side of the cylinder 4 is connected to the brake simulator 2, and the other side is connected to the first accumulator 15 as described above, and the piston 5 in the cylinder 4 receives the hydraulic pressure from the brake simulator 2 and the first accumulator 15. Moves by hydraulic pressure difference. 16 is a second accumulator, which is connected to the pipe 3. The first and second accumulators 15 and 16 are bag-shaped in which an oil chamber and a gas chamber containing high-pressure gas are separated by an elastic body (for example, a rubber membrane), and the gas pressure inside the first accumulator 15 is The gas pressure is set lower than the gas pressure of the second accumulator 16. Other symbols are the same as those in FIG.

In the above configuration, when the brake lever 1 is operated, the brake simulator 2 compresses the oil in the pipe 3, and this pressure pushes the piston 5 in the cylinder 4 and begins to move in the opposite direction, causing the piston 5 to act as a brake simulator. It is located where the oil pressure from the device 2 and the oil pressure from the first accumulator 15 are balanced. Then, a reaction force is applied by the hydraulic pressure of the first accumulator 15 and the compression force of the spring 6, and this is applied to the brake simulator 2 as an operation reaction force. This operation reaction force is applied in proportion to the amount of operation of the lever 1, but since the gas pressure in the first accumulator 15 is small and the spring constant of the spring 6 is small, until the piston 5 hits the stopper 7, the line shown in FIG. increases relatively slowly. At this time,
Since the gas pressure of the second accumulator 16 is made higher than that of the first accumulator 15, there is almost no effect on the increase in reaction force caused by the operation of the lever 1. When the piston 5 hits the stopper 7, the displacement of the lever 1 is increased mainly due to the reaction force due to the gas pressure from the second accumulator 16, and as the line in FIG. Operation 1 becomes difficult.

In this way, an operation reaction force similar to that of the actual machine can be obtained corresponding to the amount of lever operation.

In the above example, a spring 6 is provided in the cylinder 4 to speed up the return of the piston 5, but it is not necessary to provide the spring 6.

[Effects of the invention] As explained in detail above, according to the invention, the piston in the cylinder operates so that equal hydraulic pressure is applied from both sides, which eliminates oil leakage and therefore changes the pressure displacement characteristics. disappears. Furthermore, since both sides of the piston are filled with oil, there is no need for an airtight mechanism as in the past, and as a result, the frictional force within the cylinder can be significantly reduced, making it possible to reduce discomfort during operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of an example of a conventional operation reaction force generating device, and FIG. 3 is a diagram illustrating reaction force characteristics. 1... Brake lever, 2... Brake simulator, 3... Pipe, 4, 8... Cylinder, 5, 9...
Piston, 6, 10... spring, 7, 11... stopper, 15, 16... accumulator.

Claims (1)

[Scope of Claim for Utility Model Registration] A brake simulating device that simulates brake operation and changes the amount of operation into hydraulic pressure, a cylinder connected to the brake simulating device via a pipe, and a hydraulic pressure change caused by the brake device located inside the cylinder. An operation reaction force generating device comprising: a piston that receives hydraulic pressure from one direction of the cylinder; and an accumulator that is located in the other direction of the cylinder and applies hydraulic pressure to the piston from the other direction of the cylinder.