JP4616507B2 - Foot oiling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foot oiling device for automatically injecting hydraulic oil into a cylinder of a cylinder type shock absorber used for an aircraft leg.
[0002]
[Prior art]
Cylindrical devices are often used as shock absorbers used in aircraft legs.
In a cylinder type shock absorber, it is necessary to inject hydraulic oil into the cylinder prior to product testing. In addition, even if the hydraulic oil in the cylinder decreases even during use, it is necessary to lubricate.
[0003]
In general, such lubrication work is performed by pressurizing hydraulic oil with a pump and injecting it into the cylinder. However, in the case of the gas-liquid separation type, air can be completely removed from the oil chamber of the cylinder. Required. Conventionally, this requirement has been addressed by attaching a gas venting mechanism to the cylinder.
[0004]
[Problems to be solved by the invention]
However, in the case of a shock absorber used for an aircraft leg, the demand for downsizing and weight reduction is given priority, so there are many cases in which a gas venting mechanism is not attached to the cylinder. In that case, after injecting the hydraulic oil into the cylinder, manually operate the piston in the direction in which the hydraulic oil in the cylinder is pushed out, exhaust the air together with the hydraulic oil, and repeat the injection and discharge of this hydraulic oil. As a result, air is exhausted stepwise from the oil chamber of the cylinder.
[0005]
In such an operation, it takes time to lubricate, and the burden on the operator is great, and it cannot be said that the exhaust efficiency of air is high.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a leg oiling device that can easily lubricate a cylinder of a gas-liquid separation type shock absorber used for an aircraft leg and that can avoid air contamination as much as possible. It is in.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a leg oil supply device of the present invention includes a hydraulic pump that pressurizes hydraulic oil in order to supply the hydraulic oil into a cylinder of a cylinder type shock absorber used for an aircraft leg, and the cylinder. A vacuum pump that sucks the inside, a circuit switching mechanism that selectively connects both pumps to the cylinder, and automatic control of both the pump and the circuit switching mechanism to repeat suction and lubrication alternately for a predetermined cycle with respect to the cylinder A control unit, and automatically injecting hydraulic oil into the cylinder by repeating a predetermined cycle of suction and lubrication with respect to the cylinder in which the hydraulic oil has not been injected or the cylinder in which the hydraulic oil has decreased. .
[0008]
In the leg oiling device of the present invention, after the inside of a cylinder of a cylinder type shock absorber used for an aircraft leg is mechanically sucked, the working oil is supplied into the cylinder. By repeating this mechanically for a predetermined cycle , the lubrication work is simplified, and air contamination is avoided as much as possible.
[0009]
A first tank for storing hydraulic oil to be supplied into the cylinder and a second tank for storing hydraulic oil discharged from the cylinder as the cylinder is sucked are provided. By connecting the exhaust oil, the discharged oil can be easily diverted to the supply oil. In addition, the discharged oil is defoamed by the suction under reduced pressure in the second tank, and also from this point, air is prevented from entering the cylinder.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of a leg oiling device showing an embodiment of the present invention, FIG. 2 is a front view of the leg oiling device, FIG. 3 is a plan view of the leg oiling device, and FIG. 4 is a side view of the leg oiling device. It is.
[0011]
As shown in FIG. 1, the foot oiling device of this embodiment is a cylinder-type shock absorber cylinder 1 used for an aircraft leg, particularly a gas-liquid separating cylinder prior to product testing , that is, hydraulic oil is injected into its oil chamber. It is used to inject hydraulic oil into an oil chamber of a cylinder that has not been used, or a cylinder that is in use with reduced hydraulic oil in the oil chamber. The oil chamber of the cylinder 1 is provided with an oil injection port a used for injection of hydraulic oil and an oil discharge port b used for discharge.
[0012]
The foot oiling device includes two ports A and B for injecting and sucking hydraulic oil into and from the oil chamber of the cylinder 1 and two tanks 2 and 3 connected to these ports. The two tanks are connected in the horizontal direction, and one first tank 2 is a normal pressure tank that stores hydraulic oil to be injected into the oil chamber of the cylinder 1. The other second tank 3 is a decompression tank that stores hydraulic oil sucked from the oil chamber of the cylinder 1.
[0013]
The hydraulic oil in the first tank 2 is supplied to the circuit switching mechanism 7 through pressurization by the hydraulic pump 4, through the strainer 5, the pump and the filter 6. On the other hand, the inside of the second tank 3 is decompressed by the vacuum pump 8, and hydraulic oil is sucked from the circuit switching mechanism 7 through the side gauge 9 by this decompression.
[0014]
The first tank 2 and the second tank 3 communicate with each other through a solenoid type on-off valve 10. Moreover, it communicates via the manually operated on-off valve 11. Both tanks have a viewing window 12 closed by an acrylic plate or the like, so that the amount of oil inside can be confirmed.
[0015]
The first tank 2 is provided with a fuel filler port 13, a cylinder 14 and a float switch 15. A float switch 16, a vacuum / pressure switch 17, a vacuum / pressure gauge 18, and a solenoid type on-off valve 19 are attached to the second tank 3. An air breather 20 is combined with the solenoid-type on-off valve 19.
[0016]
The circuit switching mechanism 7 includes a solenoid type on / off valve 21 provided in a path from the hydraulic pump 4 to the first port A, and a solenoid type on / off valve provided in a path from the second port B to the second tank 3. 22. A throttle valve 23 is provided on the upstream side of the on-off valve 21.
[0017]
A manually operated on-off valve 24 is provided between the on-off valve 21 and the first port A. A manually operated on / off valve 25 is provided between the second port B and the on / off valve 22. The upstream side of the on-off valve 24 and the downstream side of the on-off valve 25 are connected via a manually operated on-off valve 26.
[0018]
As shown in FIGS. 2 to 4, the tanks 2 and 3 are installed on a hand-drawn cart 27. On the carriage 27, the hydraulic pump 4, the filter 6, the on-off valve 10, the control panel 28, and the like are further provided. On the tanks 2 and 3, the float switches 15 and 16, the vacuum / pressure switch 17, the vacuum pump 8, and the operation panel 29 are provided. The operation panel 29 includes the ports A and B, the pressure gauge 30, A side gauge 9, a vacuum / pressure gauge 18, and manually operated on-off valves 24 to 26 are attached.
[0019]
Next, the usage method and operation | movement of the foot oiling apparatus of this embodiment are demonstrated.
[0020]
The first tank 2 is filled with a predetermined amount of hydraulic oil. The first port A is connected to the oil supply port a of the oil chamber of the cylinder 1, and the second port B is connected to the oil discharge port b. The initial state of the on-off valves 10, 11, 19 provided in the first tank 2 and the second tank 3 is a closed state. The initial state of the on-off valves 21 and 22 in the circuit switching mechanism 7 is also closed. Regarding the manually operated on-off valves 24 to 26 provided on the operation panel 27, the on-off valves 24 and 25 are opened and the on-off valve 26 is closed.
[0021]
When the automatic switch is turned on, first, the on-off valve 22 in the circuit switching mechanism 7 is switched from the closed state to the open state, and the vacuum pump 8 starts operating. Thereby, the oil chamber of the cylinder 1 is sucked through the second tank 3. When the vacuum pump 8 continues to operate for a predetermined time, the on-off valve 22 in the circuit switching mechanism 7 switches from the open state to the closed state, and the vacuum pump 8 stops. Thereby, the oil chamber of the cylinder 1 is in a negative pressure state.
[0022]
Next, the hydraulic pump 4 starts to operate, and the on-off valve 21 in the circuit switching mechanism 7 is switched from the closed state to the open state. As a result, the hydraulic oil in the first tank 2 is injected into the oil chamber of the cylinder 1. After a predetermined time has elapsed, the on-off valve 21 in the circuit switching mechanism 7 switches from the open state to the closed state, and the hydraulic pump 4 stops. Prior to lubrication, the oil chamber of the cylinder 1 is depressurized, so that the oil chamber is efficiently filled with hydraulic oil.
[0023]
When the first cycle of suction / injection is thus completed, the on-off valve 22 in the circuit switching mechanism 7 is switched from the closed state to the open state again, and the vacuum pump 8 starts operating. After a predetermined time has elapsed, the on-off valve 22 in the circuit switching mechanism 7 is switched from the open state to the closed state, and the vacuum pump 8 is stopped. As a result, the hydraulic oil is sucked and discharged from the oil chamber of the cylinder 1 to the second tank 3, and the oil chamber of the cylinder 1 is again in a negative pressure state.
[0024]
Subsequently, the hydraulic pump 4 starts operating, and the on-off valve 21 in the circuit switching mechanism 7 is switched from the closed state to the open state. Then, after a predetermined time has elapsed, the on-off valve 21 in the circuit switching mechanism 7 switches from the open state to the closed state, and the hydraulic pump 4 stops. As a result, the hydraulic oil is again injected into the oil chamber of the cylinder 1.
[0025]
By repeating this for a predetermined cycle, hydraulic oil is filled in the oil chamber of the cylinder 1 and air is excluded.
[0026]
That is, in the foot lubrication device of this embodiment, lubrication is easily performed to the oil chamber of the cylinder 1 by repeating lubrication while sandwiching forced exhaustion / drainage by suction using a vacuum pump. Contamination is avoided as much as possible.
[0027]
By repeating the suction and lubrication cycle, the hydraulic oil in the first tank moves into the second tank 3 through the oil chamber of the cylinder 1. By opening the on-off valves 10 and 19, the working oil can be returned from the second tank 3 to the first tank 2, and can be reused for injection.
[0028]
Here, since the hydraulic oil sucked and discharged into the second tank 3 is repeatedly depressurized in the second tank 3, defoaming proceeds. Therefore, even if it returns to the 1st tank 2 and is reused for injection | pouring, there is no danger of mixing in air, and also from this point, mixing of air is avoided effectively.
[0029]
In addition, although the said embodiment has shown the case where lubricating is performed to the cylinder 1 of 2 port type provided with the oiling port a and the oil discharge port b, as shown to Fig.5 (a) (b), 1 port It is possible to lubricate the cylinder 1 of the type.
[0030]
FIG. 5A shows a case where lubrication is performed on one 1-port cylinder 1.
In this case, the first port A is connected to the cylinder 1, the on-off valves 24 and 26 are opened, and the on-off valve 25 is closed. Alternatively, the second port B is connected to the cylinder 1, the on-off valves 25 and 26 are opened, and the on-off valve 24 is closed. Thereby, suction and lubrication are repeated with respect to the cylinder 1.
[0031]
FIG. 5 (b) shows a case where the two 1-port cylinders 1 and 1 are lubricated in parallel. In this case, the first port A is connected to one cylinder 1 and the second port B is connected to the other cylinder 1. And all the on-off valves 24-26 are made into an open state. Thereby, suction and lubrication are repeated synchronously with respect to the two cylinders 1 and 1.
[0032]
【The invention's effect】
As described above, the foot lubrication device according to the present invention mechanically repeats a combination of suction and lubrication operations for a cylinder of a cylinder type shock absorber used for an aircraft leg for a predetermined cycle . Simplification can be achieved, and in combination, air contamination can be avoided as much as possible.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a foot oiling apparatus showing an embodiment of the present invention.
FIG. 2 is a front view of the leg oiling device.
FIG. 3 is a plan view of the leg oiling device.
FIG. 4 is a side view of the leg oiling device.
FIGS. 5A and 5B are circuit diagrams showing other modes of use. FIGS.
[Explanation of symbols]
1 Cylinder 2, 3 Tank 4 Hydraulic pump 7 Circuit switching mechanism 8 Vacuum pump 10, 19, 21, 22 Solenoid on / off valve 11, 24, 25, 26 Manually operated on / off valve 27 Dolly 28 Control panel 29 Operation panel

Claims (2)

A foot lubrication device for automatically injecting hydraulic oil into a cylinder of a cylinder type shock absorber used for an aircraft leg, the hydraulic pump pressurizing the hydraulic oil to supply the hydraulic oil into the cylinder, A vacuum pump that sucks the inside of the cylinder, a circuit switching mechanism that selectively connects both pumps to the cylinder, and automatic control of both pumps and the circuit switching mechanism so that suction and lubrication are alternately repeated for a predetermined cycle. And a control unit that automatically injects hydraulic oil into the cylinder by repeating a predetermined cycle of suction and lubrication with respect to the cylinder into which the hydraulic oil has not been injected or the cylinder with reduced hydraulic oil. apparatus.   A first tank for storing hydraulic oil to be supplied into the cylinder and a second tank for storing hydraulic oil discharged from the cylinder as the cylinder is sucked are provided. The foot oiling device according to claim 1, wherein:

Images