JPS5953431B2 - vehicle door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle door drive device, and more particularly to a vehicle door drive device that ensures smooth movement of the door after the emergency cock is reset.

The door installed at the entrance of the vehicle is rotated along the outside wall of the vehicle to completely open the entrance, and when the door is closed, the door itself rises and locks the door to the vehicle body. The door engine system is aesthetically pleasing and safe, and is also used in buses and other vehicles because it allows for a wide range of entrances and exits, has excellent strength, and does not rattle while the vehicle is running, and has a high sealing performance. There is.

In the door engine system, normal door opening and closing operations are performed while adjusting the pressure between the exhaust side working chamber equipped with a throttle and the air supply side working chamber, but after opening the emergency cock, When the cock is returned to normal operation, the pressure in one of the working chambers is considerably lower than the pressure during normal operation.
When the predetermined pressure from the air tank flows into the other working chamber, the pressure difference between the compartments is greater than the pressure difference when the door is normally operated, and the door exhibits sudden movement.

This sudden movement of the door is not favorable for the operation of the door, and sometimes creates a sense of danger for people around.

Therefore, an object of the present invention is to provide a vehicle door drive device that allows smooth movement of the door after the emergency cock is reset.

Embodiments of the invention will be described with reference to the accompanying drawings.

The door engine system 1 that opens and closes the entrance/exit of a bus etc. has a single door or double door type, but the single door system shown in FIG.
It basically has a door drive device 3 whose both ends are held in the vehicle, and a pair of upper and lower arms 4.5 that connect the door 2 and the door drive device 3, As the arm 4.5 rotates, the arm 4.5 moves the door 2 to the outside of the vehicle and along the outside wall of the vehicle to open the entrance, and the rotation in the direction B moves the door 2 in the open position toward the entrance. and the arm 4.5 so that the door 2 closes the entrance.

Furthermore, when the door 2 is closed, the rotation of the support column 6 is stopped and the door 2 is closed.
is moved upward to lock the door 2 and the vehicle, thereby preventing unexpected opening of the door 2 while the vehicle is running.

The door drive 3 has a cylinder 10 with a first and a second working chamber 8.9 defined by a piston 7;
Each chamber 8.9 has an emergency cock 11 and a solenoid valve 1.
2. communicates with the air tank 17 via a door closing circuit 15 and a door opening circuit 16 with throttle valves 13, 14;

The piston 7 is coupled to an upwardly extending shaft 18, and this shaft 18 engages with a spline 19 to restrict its rotation.

The shaft 18 is connected to a housing 21 within the column 6 via a ball screw 20.

Thus, for example, when air is supplied from the tank 17 to the first working chamber 8, the piston 7 and the shaft 18 rise.

At the same time, the air in the second working chamber 9 is discharged, and the rise of the shaft 18 whose rotation is restricted by the spline 19 causes the column 6 to rotate due to the action of the ball screw 20, and the arm 4.5 moves the door 2 to its position. The door 2 is moved in the closing direction, and the door 2 is closed.

Furthermore, when the door 2 is closed, the rotation of the support column 6 is restricted, so that the shaft 18 rises due to the action of the ball screw 20, causing the support column 6 to rise and the door 2 to move upward, thereby locking the door in the vehicle. let

Also, with the door 2 locked, the solenoid valve 12
When energized and air is supplied to the second working chamber 9, the piston 7 and shaft 18 descend, releasing the lock while discharging air from the first working chamber 8.

By this release, the door 2 is rotated in the opening direction by the action of the ball screw 20, causing the door 2 to align with the side wall of the vehicle and opening the entrance/exit.

When opening door 2, as shown in Figure 3,
Two doors 2 may be arranged and a door driving device 3 may be made to cooperate with each door.

By the way, in the air circuit for driving the door shown in Fig. 1, during normal door operation, the door is opened and closed by a predetermined pressure difference between the two operating chambers 8.9, but when the emergency cock is opened and the air is released After that, when this is restored, the pressure in the second working chamber 9 has become considerably low, so when the pressure from the air tank is supplied to the first working chamber 8, the pressure in both chambers 8 and 9 during normal door operation is reduced. A pressure difference greater than the pressure difference is exhibited, and the door 2 rotates at a rapid movement speed.

For this reason, smooth movement of the door 2 cannot be expected and is sometimes dangerous.

In this embodiment of the invention, an anti-shock valve 22 shown in FIG. 5 is disposed between the solenoid valve 12 and the emergency cock 11.

The anti-shock valve 22 has an inlet passage 23 and an outlet passage 24, and a check valve and an orifice 26 are provided in the anti-shock valve 22.

The check valve 25 has a chamber 27 that can communicate with the inlet passage 23 and the outlet passage 24, and a piston 29 biased by a spring 28 is inserted into the chamber 27.

A valve member 30 that controls communication between the chamber 27 and the inlet passage 23 is fixed to the piston 29, and the outlet passage 24 is
It is in constant communication with room 27.

Air pressure in outlet passage 24 enters chamber 27 and piston 29
The biasing force of the spring 28 (thus acts).

When this air pressure is above a predetermined value, the pressure from the inlet passage 23 acting on the sealing member 30 and the piston 29 in this chamber 27
The pressure acting on the piston 29 lifts the piston 29 upwards, as seen in FIG.

An orifice 26 is provided in parallel with the check valve 25 .

The orifice 26 is bored in a plate 32 that is biased by a spring 31, and is opened when the check valve 25 is blocking the inlet passage 23 and the outlet passage 24, that is, after opening the emergency cock 11. However, when the air in the outlet passage 24 is removed and the pressure in the chamber 27 is low, it functions to supply air from the inlet passage 23 to the outlet passage 24.

The supply of air through this orifice 26 rapidly supplies air to the first working chamber 8, prevents the pressure in this chamber from increasing rapidly, and allows smooth movement of the door 2.

In addition, air bleeding from the first working chamber 8 when opening the emergency cock is as follows:
The plate 32 is pressed down by air from the chamber 8,
Since there are enough fluid channels, it can be made into short poems.

Thus, the door unlocks and moves under its own weight.

As is clear from the above, in this example, even if the emergency cock is opened and then reset, and the pressure in the second working chamber is considerably low, the air from the air tank is routed through the orifice to the first working chamber. This allows the pressure difference in the compartment to be as high as necessary for normal door operation, resulting in smooth door movement.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of the vehicle showing the door section, Fig. 2 is a partially cutaway front view showing the door drive mechanism, Fig. 3 is a cross-sectional view showing an example of a two-panel door, and Fig. 4 is a shock prevention valve. FIG. 5 is an explanatory diagram of the door drive circuit incorporating the shock prevention valve. In the diagram: 2...Door, 4.5...Arm, 6.Curve/support, 7...Piston, 8.9...
... Working chamber, 1° ... Cylinder, 11.
...Emergency cock, 12...Solenoid valve, 17...Air tank, 22...
Shock prevention valve, 25...Check valve, 26.
...orifice.

Claims (1)

[Scope of Claims] 1. A cylinder having first and second working chambers communicating with an air supply source via a solenoid valve, a shaft coupled to a piston defining both working chambers, and a vertical movement of the shaft. The piston and the shaft are raised by supplying air to the first working chamber, and the door is connected to the pillar through a pair of arms. In a vehicle door driving device for closing and locking, an emergency cock, a check valve, and an orifice are arranged in parallel in a fluid path between the air supply source and the solenoid valve;
A door drive device for a vehicle, characterized in that it is provided with a prevention valve in series. 2. The shock prevention valve has an inlet passage connected to the emergency cock and an outlet passage connected to the working chamber, and the check valve has a chamber that can communicate with the inlet passage and the outlet passage,
A first method characterized in that a piston disposed in the chamber and biased by a spring closes the chamber and the inlet passage when air pressure in the outlet passage is below a predetermined value. The vehicle door drive device described in Section 1. 3. The vehicle door drive device according to item 2, wherein the orifice is formed in a plate biased by a spring.