JP2000064710A - Door closing device for door of car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the door closing device for door of car, in which the circuit constitution of air pressure is simplified and by which the door is not opened even when pressure-intensifying control is conducted at the time that the door is entirely closed. SOLUTION: The opening-side port 11c of a cylinder 11b is supplied with compressed air decompressed at a specified value so that door-opening force is limited at the time of pressure-intensifying control in consideration of the difference of the effective pressure-receiving areas of a piston 11p in both directions of the door closing direction and the door opening direction. A changeover valve is not used, and a valve 8 for door opening is supplied with compressed air decompressed at a specified value at all times by a reducing valve 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door fastening device for a vehicle door.

[0002]

2. Description of the Related Art According to a door closing device for a vehicle door disclosed in Japanese Patent Application Laid-Open No. 7-139249, a solenoid valve for opening and closing the door, a switching valve and a pressure control valve are provided for opening and closing the door. Door closing force reducing means connected to the opening side port of the cylinder is provided. The door closing force reducing means relatively reduces the door closing force by increasing the air pressure of the low pressure side pressure chamber to some extent during the door closing operation, and enables the escape of a person or an object from the state of the door being caught. Such a control method of relatively reducing the door closing force by increasing the air pressure in the low pressure side pressure chamber is called pressure increase control. Pressure boosting control is performed when the door is jammed when the door is not completely closed (pressure boosting control while the door is closed), or when small items such as clothes or bag strings are caught in the closed door. There is a case where it is performed to enable escape (pressure increase control when fully closed). Further, the publication also discloses, as another configuration example to which the pressure increase control is applied, a door tightening device having a configuration in which a door opening electromagnetic valve also serves as door closing force reducing means. In this door tightening device, the solenoid valve for opening the door is operated during or when the door is fully closed to introduce the same air pressure as the high pressure side pressure chamber into the low pressure side pressure chamber of the cylinder, so that the piston moves in the opening direction. Give the power of. As a result, the door closing force is relatively lost, and it becomes possible to escape from the state of the door being caught.

[0003]

The former of the above-described conventional door closing devices for vehicle doors is provided with a switching valve and a pressure control valve in addition to the solenoid valve for opening and closing the door. , The pneumatic circuit configuration becomes complicated. In that regard, in the latter case, the circuit configuration is simplified. However, in the latter door tightening device, the following problems occur during the pressure increase control when fully closed. That is, because of the essential structural feature of the piston, the effective pressure receiving area on the closed side where the rod is provided is smaller than the effective pressure receiving area on the open side where the rod is not provided. Therefore, by introducing the same air pressure as the high pressure side pressure chamber into the low pressure side pressure chamber of the cylinder, the door opening force exceeds the door closing force due to the difference in the effective pressure receiving area of the piston. Moreover, since the capacity of the low pressure side pressure chamber is the smallest when fully closed, supplying air pressure causes the piston to move in the opening direction in a short time. When the door opens in this way, it has to be closed again to confirm that it is fully closed, which delays train departure.

In view of the above-mentioned conventional problems, the present invention has a simple pneumatic circuit structure and does not open even if pressure increase control is performed when the door is fully closed. It is an object of the present invention to provide a door closing device for a vehicle.

[0005]

A door closing apparatus for a vehicle door according to the present invention has a piston with a rod for opening and closing the door, a rod side chamber is provided with a closing side port, and a head side chamber is provided with an opening side port. And a door closing valve that is connected to the closing port and that supplies and discharges compressed air supplied from an air source to the closing port, and the opening side that is connected to the opening port. A door opening valve that supplies and discharges compressed air supplied from the air source to the port, and outputs a door closing force reduction command to compress the door closing valve and the door opening valve, respectively. Is provided in series with the door opening force reducing means at the supply position and limits the air pressure from the air source supplied to the head side chamber of the cylinder via the door opening valve. And a pressure control valve (Claim 1). In the vehicle door closing device thus configured, the pressure control valve limits the air pressure from the air source supplied to the head side chamber of the cylinder. Therefore, even if the door closing force decrease command is output when the door is fully closed and the pressure increasing control is performed with the door closing valve and the door opening valve at the supply positions, the piston immediately opens in the opening direction due to the air pressure limitation. The problem that the door operates and opens immediately is eliminated. In addition,
The restriction of the air pressure is not limited to making the door opening force of the cylinder less than or equal to the door closing force, and may be a condition that the door opening force is slightly higher than the door closing force. Even in this case, during the pressure increase control at the fully closed position, it is possible to secure a certain amount of time before the piston moves in the opening direction to open the door, and during that time, the door closing force can be reduced. .

In the door tightening device (claim 1), when the effective pressure receiving area of the rod side chamber of the piston with rod is Sc and the effective pressure receiving area of the head side chamber is So, the pressure control valve is Sc / The pressure may be reduced at a pressure reduction ratio smaller than So to make the door opening force of the cylinder smaller than the door closing force (claim 2). In this case, the door opening force of the pressure increase control is always smaller than the door closing force. Therefore, the door closing force is always secured.

In the door tightening device (claim 1), when the effective pressure receiving area of the rod side chamber of the piston with rod is Sc and the effective pressure receiving area of the head side chamber is So, the pressure control valve is Sc / The pressure may be reduced at a pressure reduction ratio equal to So to make the door opening force and the door closing force of the cylinder equal to each other (claim 3). in this case,
When the pressure increase control is performed, the door opening force becomes equal to the door closing force.
Therefore, there is almost no pinching force.

Further, in the door tightening device (claim 2), the door closing force reduction command is for detecting a door jam during a door closing process,
Alternatively, it may be output by full-closed detection (claim 4). In this case, when the door closing force decrease command is output in response to the detection of the door jamming during the door closing process or when the door is fully closed, the door closing force is relatively decreased and the door driving force is reduced. Therefore, it is possible to escape from the state of being pinched. On the other hand, even in that case, since the door closing force is still larger than the door opening force, the door closing operation is continued during the closing process. Further, the door closed state can be maintained when fully closed.

Further, in the door tightening device (claim 3), the door closing force reduction command may be output by detecting a door jam during a door closing process (claim 5). In this case, if the pressure increase control is performed in the door-nipped state during the door closing process, the door opening force becomes equal to the door closing force, and the pinching force is almost eliminated. Therefore, it is easy to escape.

In the door tightening device (claim 1), the door closing valve, the door opening valve and the pressure control valve constitute a single control valve unit and are attached to the cylinder. (Claim 6). In this case, the door closing valve, the door opening valve, and the pressure control valve are connected to each other in the control valve unit. Therefore, the circuit connection can be completed by making only the circuit connection with the outside.

Further, in the door tightening device (claim 6), the door closing valve and the door opening valve are driven by receiving pilot pressure from corresponding electromagnetic pilot valves, and these electromagnetic pilot valves are controlled by the control. It may constitute a part of the valve unit (Claim 7). In this case, the door closing valve, the door opening valve, the pressure control valve and the electromagnetic pilot valve are completely connected to each other in the control valve unit. Therefore, the circuit connection can be completed by making only the circuit connection with the outside.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a connection circuit diagram of a vehicle door door fastening device according to a first embodiment of the present invention. In the figure, a predetermined pressure (for example, 490 kPa (5 kgf / cm ² )) from an air source is applied to the input port 1 a of the door closing machine 1.
Is supplied with compressed air. The input port 1 a is connected to the electromagnetic pilot valves 4 and 5, the door closing valve 6, and the pressure reducing valve (pressure control valve) 7 via the dust collector 2 and the door cock 3. The pressure reducing valve 7 is connected in series with the door opening valve 8, and each one port of the door opening valve 8 and the door closing valve 6 has a muffler 9.
Connected with. The door closing valve 6 operates by receiving pilot pressure from the electromagnetic pilot valve 4, and the door opening valve 8 operates by receiving pilot pressure from the electromagnetic pilot valve 5, respectively. The electromagnetic pilot valves 4 and 5 operate upon receiving a command from the control unit 21.

The electromagnetic pilot valves 4 and 5, the door closing valve 6, the pressure reducing valve 7, and the door opening valve 8 constitute a single control valve unit 10 and are connected to the outside by 4 units. Via one port 10a, 10b, 10c and 10d. Therefore, if the control valve unit 10 is completed in a separate process, the four ports 10a, 10b, 10c and 10
Control valve unit 1 by connecting d to the corresponding part
Since the circuit configuration within 0 is completed, it is possible to reduce the assembly process of the door closing machine 1.

The cylinder 11 has a double cylinder structure in which an outer cylinder 11a is provided with a piston 11p for opening and closing a door (not shown) and an inner cylinder 11b surrounding a part of a rod 11r. There is. The closed side port 11c of the rod side chamber (left side) of the cylinder 11 is connected to the port 10c of the control valve unit 10 via an open cushion adjusting screw (variable throttle valve) 12. The closed port 11d of the rod-side chamber of the cylinder 11 is connected to the port 10c of the control valve unit 10 via a parallel body of the opening speed adjusting screw (variable throttle valve) 13 and the check valve 14. Similarly, the open side port 11e of the head side chamber (right side) of the cylinder 11 is provided with a closing cushion adjusting screw (variable throttle valve).
It is connected to the port 10 d of the control valve unit 10 via 15. The open side port 11f of the head side chamber of the cylinder 11 is connected to the port 10d of the control valve unit 10 via a parallel body of a closing speed adjusting screw (variable throttle valve) 16 and a check valve 17. The cylinder 11, variable throttle valves 12, 13, 15 and 16, check valves 14 and 1
7, the dust collector 2, and the door cock 3 constitute a cylinder portion 20.

In the piston 11p, the rod side chamber (left side) in FIG. 1 to which air pressure is applied in the door closing direction.
Where Sc is the effective pressure receiving area of No. and So is the head side chamber (right side) to which air pressure is applied in the door opening direction, So is smaller than So because the rod 11r is provided. Therefore, if equal air pressure F is supplied to both sides of the piston 11p, the force F · Sc applied to the piston 11p in the door closing direction and the force F · S in the door opening direction.
The relationship with o is F · Sc <F · So. That is,
Door opening force exceeds door closing force. In particular, since the low-pressure side pressure chamber has the smallest capacity when fully closed, when the door opening force exceeds the door closing force, the piston 11p immediately moves in the door opening direction and the door opens. In consideration of this point, the air pressure Fo after being reduced by the pressure reducing valve 7 is set so that Fc · Sc ≧ Fo · So, where Fc is the air pressure supplied from the air source. That is, the pressure reducing ratio K (= Fo of the pressure reducing valve 7
/ Fc) is less than Sc / So. Therefore, when the air pressure is applied to push the piston 11p in the door closing direction, even if the reduced air pressure is applied to push the piston 11p in the door opening direction, the piston 11p does not return to the door opening direction. In this way, the adverse effect due to the difference in the effective pressure receiving area is eliminated by the pressure control (pressure reduction).

In the above pressure control, the pressure reduction ratio K is K <
If (Sc / So), the door opening force in the pressure increase control is always smaller than the door closing force. Therefore, when the pressure increase control is performed when the door is sandwiched during the door closing operation, the door is continuously closed while allowing the escape from the door. Further, even in the case of the pressure increase control at the time of fully closing, the door closing force is predominant, so that it is unlikely that the door is easily opened due to mischief or the like. Also,
If the pressure reduction ratio K is K = (Sc / So), the door opening force and the door closing force in the pressure increase control become equal. Therefore,
The pinching force is almost eliminated, and it is extremely easy for an old man or a child to escape from the state of the door being pinched during the door closing operation. However, it is necessary to take into consideration that if such pressure increase control is performed when the door is fully closed, the door may be easily opened due to mischief or the like. Although the pressure reduction ratio K is preferably Sc / So or less, even if K> (Sc / So), a certain degree of action and effect can be obtained as long as the pressure is reduced. That is, if K> (Sc / So), the door opening force in the pressure increase control when fully closed exceeds the door closing force. However, if the value is slightly larger than the above value, there is actually a delay in the response in the opening direction operation of the door. Therefore, it is possible to secure a certain amount of time until the piston moves in the opening direction and the door opens. Therefore, during that time, the door closing force can be reduced.

2A is a front view of the door closing machine 1 and FIG. 2B is a bottom view thereof. The parts corresponding to those in FIG. 1 are designated by the same reference numerals. Door closing switch 2 that detects that the door is fully closed in the center (strictly speaking, a little before that)
Two are provided. The control valve unit 10 is attached to the right end of the cylinder 11. Next, the structure of the control valve unit 10 will be described in more detail. 3A and 3B are views showing the control valve unit 10 as a single unit, in which FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a bottom view. The electromagnetic pilot valves 4 and 5 are provided on the front side, and four ports 10a, 10b, 10c and 10d are provided on the bottom surface.

FIG. 4 is an internal sectional view of the control valve unit 10. FIG. 4D is a sectional view seen from the same front direction as FIG. 3A, and FIG. 4A is a sectional view taken along line AA in FIG. Figure, (b)
Is a cross-sectional view taken along the line BB in (d), and (c) is a cross-sectional view taken along the line C-C in (d). As shown in the figure, the door closing valve 6,
The pressure reducing valve 7 and the door opening valve 8 are built in the control valve unit 10. Therefore, the electromagnetic pilot valves 4 and 5, the door closing valve 6, the pressure reducing valve 7, and the door opening valve 8 are integrated into one control valve unit 10 in a mutually connected state, and Is connected to four ports 10a, 10b,
It is only necessary to connect the pipes to 10c and 10d.

Next, the operation of the door fastening device will be described. First, the opening operation will be described assuming that the door is closed in the initial state. In FIG. 1, when a door opening command is output from the control unit 21, the electromagnetic pilot valves 4 and 5 are excited and operate. As a result, the compressed air of a predetermined pressure supplied through the dust collector 2 and the door cock 3 is supplied as pilot pressure to the door closing valve 6 and the door opening valve 8, and the door closing valve 6 and the door opening valve 8 operate. To do. As a result,
The door opening valve 8 is in communication with the pressure reducing valve 7, and the door closing valve 6 is in communication with the silencer 9.

The compressed air is depressurized to a predetermined air pressure Fo through the pressure reducing valve 7, then supplied to the cylinder portion 20 through the door opening valve 8, and passed through the check valve 17 and the closing cushion adjusting screw 15, respectively. It is supplied to the open side ports 11f and 11e. On the other hand, the air in the pressure chamber on the left side of the piston 11p passes through the door closing valve 6 from the closing ports 11c and 11d via the opening cushion adjusting screw 12 and the opening speed adjusting screw 13, respectively, and is exhausted from the silencer 9. It Therefore, the piston 11p of the cylinder 11 moves leftward in the figure together with the inner cylinder 11b, and the door opens. At this time, the opening speed of the door can be adjusted by the opening speed adjusting screw 13.

The piston 11p and the inner cylinder 11b move to the left in FIG.
When contacting the left end of 1a, the inner cylinder 11b cannot move any further. At this time, the closed port 11d
Is closed by the inner cylinder 11b. Therefore, after that, only the piston 11p moves, and the exhaust at that time is performed only from the closing port 11c. As a result, the exhaust gas flow rate decreases and the moving speed of the piston 11p decreases. That is, the opening speed of the door becomes slow. This is an operation generally called an "open cushion", which prevents a body or object from being caught between the door that opens and the vehicle body. The opening speed of the door during the opening cushion can be adjusted by the opening cushion adjusting screw 12.
In this way, the door is fully opened.

Next, the closing operation of the door will be described with reference to the time chart of FIG. In FIG. 1, when a command to close the door is output from the control unit 21, the electromagnetic pilot valve 4
And 5 are demagnetized, and the pilot pressure supplied to the door closing valve 6 and the door opening valve 8 is lost. As a result, the door closing valve 6 is brought into communication with the door cock 3, and the door opening valve 8 is brought into communication with the silencer 9.

The compressed air is supplied to the cylinder portion 20 via the door closing valve 6, and is supplied to the open side ports 11d and 11c through the check valve 14 and the opening cushion adjusting screw 12, respectively. On the other hand, the air in the pressure chamber on the right side of the piston 11p passes through the door opening valve 8 from the opening side ports 11e and 11f via the closing cushion adjusting screw 15 and the closing speed adjusting screw 16, respectively, and is exhausted from the silencer 9. It Therefore,
The piston 11p of the cylinder 11 moves to the right in the figure together with the inner cylinder 11b, and the door closes. The door driving force at this time is the maximum value as shown in FIG. 5, and is, for example, 74 kgf. The closing speed of the door can be adjusted by the closing speed adjusting screw 16.

During the door closing operation, when the "door-to-door" state, in which a person or an object is sandwiched between the doors, is detected by the door-to-door detection means (not shown), the controller 21 issues a door closing force reduction command. It is output to the pilot valve 5, and the electromagnetic pilot valve 5 is in the communicating position. As a result, the door opening valve 8 operates and communicates with the pressure reducing valve 7, and the compressed air decompressed through the pressure reducing valve 7 passes from the door opening valve 8 to the check valve 17 and the closing cushion adjusting screw 1.
It is supplied to the open-side ports 11f and 11e via 5.
As a result, the low pressure side pressure chamber of the cylinder 11 is increased in pressure,
The pressure difference from the high pressure side pressure chamber is reduced. As a result, the door driving force temporarily drops to a predetermined value (for example, 20 kgf). This allows escape from the door pinch. This state is maintained for time T1, after which the electromagnetic pilot valve 5 is demagnetized and the door driving force is restored. When the door pinch has not been resolved yet, the door driving force is reduced again for the time T1 to provide an escape opportunity (see FIG. 5).

The piston 11p and the inner cylinder 11b move to the right in FIG.
When it comes into contact with the right end of 1a, the inner cylinder 11b cannot move any further. At this time, the open side port 11f
Is closed by the inner cylinder 11b. Therefore, after that, only the piston 11p moves, and the exhaust at that time is performed only from the open side port 11e. As a result, the exhaust flow rate decreases, the moving speed of the piston 11p decreases, the closing speed of the door decreases, and the door driving force also decreases to a predetermined value (for example, 51 kgf). This is an operation generally called a "closing cushion", which prevents a body or object from being caught between the doors to be closed. The closing speed of the door during the closing cushion can be adjusted by the closing cushion adjusting screw 15.

The cushion region in which the above-mentioned closing cushion operation is performed is until the door is fully closed. However, the door close switch 22 (FIG. 2) is turned on shortly before the door is fully closed, and from that time point, the electromagnetic pilot valve 5 is excited and the door opening valve 8 is brought into communication with the pressure reducing valve 7. Therefore, the pressure chamber of the low pressure side of the cylinder 11 is increased in pressure, and the pressure difference from the pressure chamber of the high pressure side is reduced. As a result, the door driving force is a predetermined value (for example, 13k
down to gf). Therefore, when small items such as clothes and a string of a bag are sandwiched between the fully closed doors, these can be escaped.

After that, the train starts with the door driving force reduced. When the train speed reaches 5 km / h, the door closing safety signal is turned on and the electromagnetic pilot valve 5 is demagnetized.
The door opening valve 8 is communicated with the silencer 9. As a result, the door driving force returns to the predetermined value (51 kgf) again, and the door is prevented from opening during traveling.

Although the door closing valve 6 and the door opening valve 8 are valves driven by pilot pressure in the above embodiment, it goes without saying that electromagnetic valves may be used instead. .

[0029]

The present invention constructed as described above has the following effects. According to the vehicle door closing device of the first aspect, the pressure control valve limits the air pressure from the air source supplied to the head side chamber of the cylinder. Therefore, the pressure increase control is performed when the door is fully closed. Also, it is possible to prevent the problem that the door is opened immediately. Therefore, it is possible to prevent a train departure delay due to useless opening. Moreover, since the switching valve is not required, the circuit structure of the pneumatic pressure is simplified, and the assembling of the door fastening device becomes easier.

According to the door closing device for a vehicle door of claim 2, since the door opening force of the pressure increase control is always smaller than the door closing force, the door closing force is always ensured and it is possible to escape from the state of the door being caught. And the door can be closed quickly. Therefore, the departure delay of the train can be prevented.

According to the vehicle door door tightening device of the third aspect, when the pressure increasing control is performed, the door opening force becomes equal to the door closing force, and the pinching force is almost eliminated. Therefore, it is the easiest to escape from the state of being pinched.

According to the vehicle door door tightening device of the fourth aspect, when the door closing force decrease command is output in response to the detection of the door jamming during the door closing process or at the time of fully closing, the door closing force is relatively changed. The door driving force decreases. Therefore, it is possible to escape from the state of being pinched. On the other hand, even in that case, since the door closing force is still larger than the door opening force, the door closing operation is continued during the door closing process, and the door is quickly closed. Further, since the door closing force is larger than the door opening force even when the door is fully closed, it is unlikely that the door will be easily opened due to mischief or the like. Therefore, it is possible to prevent a train departure delay due to mischief or the like.

Further, according to the door tightening device of the fifth aspect, when the pressure increase control is performed in the state of the door being pinched during the door closing process,
The door opening force becomes equal to the door closing force, and there is almost no pinching force. Therefore, it is easy to escape from the state of being pinched and safe.

According to the vehicle door door tightening device of the sixth aspect, since the door closing valve, the door opening valve and the pressure control valve are completely connected to each other in the control valve unit, they are connected to the outside. If only the circuit connection is performed, the circuit connection can be completed, and the number of assembling steps of the entire door fastening device can be reduced.

According to the door closing apparatus for a vehicle door of claim 7, the door closing valve, the door opening valve, the pressure control valve, and the electromagnetic pilot valve are completely connected to each other in the control valve unit. If only the circuit connection with the outside is performed, the circuit connection can be completed, and the number of assembling steps of the entire door fastening device can be further reduced.

[Brief description of drawings]

FIG. 1 is a connection circuit diagram showing a door fastening device for a vehicle door according to an embodiment of the present invention.

FIG. 2 is a view showing a door closing machine of the door tightening device,
(A) is a front view and (b) is a bottom view.

3A and 3B are views showing a control valve unit of the door fastening device alone, in which FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a bottom view (partially omitted).

FIG. 4 is an internal cross-sectional view of the control valve unit,
FIG. 3D is a sectional view seen from the same front direction as FIG.
(A) is a sectional view taken along line AA in (d), and (b) is (d).
BB sectional drawing in, (c) CC in (d)
FIG.

FIG. 5 is a time chart showing a door closing operation in the door fastening device.

[Explanation of symbols]

1 Door closing machine 4, 5 solenoid pilot valve 6 Door closing valve 7 Pressure reducing valve (pressure control valve) 8 door opening valve 10 Control valve unit 11 cylinders 11c, 11d Closed port 11e, 11f Open port 11p piston 21 Control unit

Claims (7)

[Claims] 1. A piston with a rod for opening and closing a door,
A cylinder in which a closed side port is provided in the rod side chamber and an open side port is provided in the head side chamber, and the cylinder is connected to the closed side port and with respect to the closed side port,
A door closing valve that supplies and discharges compressed air supplied from an air source, and is connected to the opening side port, and with respect to the opening side port,
A door opening valve that supplies and discharges the compressed air supplied from the air source, and outputs a door closing force decrease command to set the door closing valve and the door opening valve to the compressed air supply positions, respectively. A door closing force reducing means, and a pressure control valve that is provided in series with the door opening valve and limits the air pressure from the air source supplied to the head side chamber of the cylinder via the door opening valve. A door closing device for a vehicle, which is characterized by being provided. 2. When the effective pressure receiving area of the rod side chamber of the piston with rod is Sc and the effective pressure receiving area of the head side chamber is So, the pressure control valve performs pressure reduction at a pressure reducing ratio smaller than Sc / So, The door tightening device for a vehicle door according to claim 1, wherein the door opening force of the cylinder is smaller than the door closing force. 3. When the effective pressure receiving area of the rod side chamber of the piston with rod is Sc and the effective pressure receiving area of the head side chamber is So, the pressure control valve performs pressure reduction at a pressure reducing ratio equal to Sc / So, 2. The door tightening device for a vehicle door according to claim 1, wherein the door opening force and the door closing force of the cylinder are made equal to each other. 4. The door tightening device for a vehicle door according to claim 2, wherein the door closing force reduction command is output by a door pinch detection or a fully closed detection during a door closing step. 5. The door closing apparatus for a vehicle door according to claim 3, wherein the door closing force reduction command is output by detecting a door jam during a door closing process. 6. The vehicle according to claim 1, wherein the door closing valve, the door opening valve and the pressure control valve constitute a single control valve unit and are attached to the cylinder. Door locking device. 7. The door closing valve and the door opening valve are driven by receiving pilot pressure from corresponding electromagnetic pilot valves, and these electromagnetic pilot valves form a part of the control valve unit. 7. The door fastening device for a vehicle door according to claim 6, wherein.