JPH09287890A - Breech lock operating device of machine gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the count of parts by a method wherein when a breech transfers from a forward movement stoppage step to a retreat step, working fluid in a fourth pressure chamber of a second cylinder is supplied to a second pressure chamber of a first cylinder by a cam member to pull back a lock member in the circumferential direction. SOLUTION: After an ammunition 13 is hammered to shoot a bullet during the complete closed period of a breech 4, a cam drum 9 turns further, a second piston rod and a second piston are pushed ad driven by a second cam face 10c of a cam member 10, the cam drum 9 turns at the end of forward movement stoppage step of the breech 4, a lock member 12 descends gradually and returns to the descending position before the breech 4 enters the retreat step. Thereby, the connection of the lock member 12 with a connection recessed part 4b of the breech 4, that is, the closed state of the breech 4 is released. After that, the lock member 12 is kept at the return position for a period till the forward movement of the breech 4 is complete after the breech 4 begins to retreat with the rotation of the cam drum 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breech lock actuating device for a cannon.

[0002]

2. Description of the Related Art In a conventional machine gun, for example, the following devices are known as devices for closing the barrel by means of an integral breech driven by a cam drum. (1) As shown in FIG. 4, the closing cam portion 5 is attached to the cam drum 59.
9a is provided to keep the barrel 51 closed while the closing cam portion 59a rotates while the playground 55 stops moving forward. 61 is an ammunition.

(2) As described in Japanese Unexamined Patent Publication No. 7-146093, a breech having an engaging recess, a locking member disposed at the rear end of the barrel and movable in the radial direction, and a barrel side. The cam drum is provided with a push cam that is rotatably supported and is capable of pushing the lock member in the inner diameter direction, and is provided with a cam ring having a toothed cam. The cam drum has a first protrusion cam and a second protrusion cam. The first projection cam engages with the toothed cam to rotate the cam ring by a predetermined angle when the free bottom moves from the forward stroke to the forward stop stroke as the cam drum rotates, and the lock member is pressed by the push cam. Then, the lock member is pushed in the inner diameter direction to engage the lock member with the engaging recess of the breech bolt. Further, the second projection cam rotates the cam ring by a predetermined angle to release the engagement of the lock member with the pushing cam when the play bottom shifts from the forward stop stroke to the backward stroke.
The engagement between the lock member and the engaging recess of the play bottom can be released. The lock member released from the engagement with the push-in cam returns to the outer diameter direction by the elastic force of the elastic body.

[0004]

However, there are the following technical problems with such a conventional breech lock actuating device for a machine gun. In the unlocking bottom lock actuating device of the machine gun shown in FIG. 4, when the ammunition 61 is shot and the bullet is fired, the force applied to the playing bottom 55 is applied to the cam drum 59.
Will be received by the closing cam portion 59a. For this reason, it is necessary to make the cam drum 59 sturdy so as to endure this, and it becomes inevitably heavy. Further, in the method of driving the cam drum 59 with external power, it is necessary to rotate the cam drum 59 at a predetermined speed even while the load is being applied. Therefore, the torque required to drive the cam drum 59 is large, and the motor capacity is also large.

Further, in the free-bottom lock actuating device for a machine gun disclosed in Japanese Patent Laid-Open No. 7-146093, a lock member that engages with the engaging recess of the free bottom is formed separately from the cam drum. However, there is an advantage that the cam drum does not have to be loaded by the firing of a bullet, and the cam drum can be made lighter. On the other hand, as a constituent member, a play bottom having an engagement recess, a lock member and a cam drum are provided. In addition to the formed first protrusion cam and second protrusion cam, a cam ring having a pushing cam and a tooth-shaped cam and an elastic body for returning the lock member are required. Therefore, there is a technical problem that the number of parts increases with the mechanical structure, and the structure of the playground lock actuator becomes complicated.

Further, in order to prevent a malfunction in which the cam ring is inadvertently returned in the outer diameter direction due to the rotation of the cam ring due to vibration or other external force, the lock member and the engaging recess of the breech bolt engage with each other. In this state, the engagement cam that engages with the second cam surface of the cam drum so as to restrain the rotation of the cam ring,
It is necessary to form the cam ring.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional technical problems, and has the following configuration. The structure of the invention of claim 1 is such that the rotating cam drum 9 at least moves forward in the central axis direction of the barrel 1 so that the forward movement, forward movement stop, and backward movement are sequentially performed. A cannon lock actuating device for a cannon equipped with a cam drum 9 of the cannon 4
An engaging concave portion 4b is formed on a surface facing to and a guide hole 2a extending in the radial direction of the barrel 1 is formed on the frame 2 side, and a lock member 12 movably arranged in the guide hole 2a is provided on the barrel 1. A lock driving device 11 that is driven in the radial direction is arranged, and the lock driving device 11 is configured such that the lock member 1
The double-acting first cylinder device 25 that drives the barrel 2 in the radial direction of the barrel 1, the double-acting second cylinder device 35, and the piston 35b of the second cylinder device 35 that is provided on the cam drum 9 side And a cam member 10 which is reciprocally driven, the cam member 10 drives the second cylinder device 35 to move the second cylinder device 35 when the play bottom 4 shifts from the forward stroke to the forward stop stroke as the cam drum 9 rotates. Third pressure chamber C of device 35
The hydraulic fluid therein is supplied into the first pressure chamber A of the first cylinder device 25, the lock member 12 is pushed in the inner diameter direction, and the lock member 12 is engaged with the recessed portion 4b of the play bottom 4 in the forward stop position.
The cam member 10 drives the second cylinder device 35 to move the hydraulic fluid in the fourth pressure chamber D of the second cylinder device 35 to the first position when the playground 4 shifts from the forward stop stroke to the backward stroke. An engine characterized in that it is supplied into the second pressure chamber B of the one-cylinder device 25 to pull back the lock member 12 in the outer diameter direction, and the engagement between the lock member 12 and the engagement recess 4b of the play bottom 4 is released. It is a breech lock actuation device for a gun. According to the configuration of the invention of claim 2, the third cylinder device 45 is provided in which the third piston 45b biased by the elastic body 22 constantly applies a predetermined pressure to the hydraulic fluid in the fifth pressure chamber E. , The fifth pressure chamber E is communicated with the third pressure chamber C and the first pressure chamber A by the first communication passage 42, and the fourth pressure chamber D and the second pressure by the second communication passage 43. The bottom lock actuating device for a cannon according to claim 1, wherein the device is in communication with the chamber B. According to a third aspect of the invention, the first communication passage 42 has a fifth
A first check valve 46 that allows the flow of the hydraulic fluid from the pressure chamber E toward the third pressure chamber C and the first pressure chamber A and blocks the reverse flow is provided, and the fifth check valve 46 is provided in the second communication passage 43. 3. The engine according to claim 2, further comprising a second check valve 47 which allows the flow of the hydraulic fluid from the pressure chamber E toward the fourth pressure chamber D and the second pressure chamber B and blocks the reverse flow. It is a breech lock actuation device for a gun.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 relate to an embodiment of a breech bolt lock actuating device for a cannon according to the present invention.
First, the main part of the cannon will be described with reference to FIGS. The machine gun has a frame 2 to which a barrel 1 is fixed,
A dome 4 is slidably accommodated on the support surface 2b in the frame 2 so that the cam drum 9 sequentially performs forward, forward, and backward movements in the direction of the central axis of the barrel 1.
And a non-illustrated bullet-sending mechanism which is arranged in the bullet-sending unit 3 and intermittently supplies the ammunition 13 between the breech bolt 4 and the barrel 1 (loading preparation position). The cam drum 9 at the front end of the playground 4
A hole-shaped engaging concave portion 4b is formed on the surface facing to.

As shown in FIG. 1, the cam drum 9 is rotatably supported by the frame 2 at the front and rear ends of a central shaft 8 via bearings 7, 7, and is connected to a drive unit 6 and a drive unit 5 such as an external motor. It connects and rotates by receiving the rotational force. Cam drum 9
An endless spiral cam groove 9a is formed on the outer peripheral surface of the cam ring 9 to repeatedly give a forward movement, a forward movement stop, and a backward movement to the play bottom 4, and the cam groove 9a of the cam drum 9 is provided with a roller of the play bottom 4. 4a is engaged. Then, by the rotational driving of the cam drum 9 in one direction, the play bottom 4 is driven so as to perform the series of operations while sliding on the support surface 2b of the frame 2. It is also possible to repeatedly give the play bottom 4 a series of operations of forward movement, forward movement stop, backward movement, and backward movement stop.

Further, one guide hole 2a extending in the radial direction of the barrel 1 is formed through the frame 2 near the rear end of the barrel 1, and the lock member 12 is slidable in the guide hole 2a. It is arranged. This locking member 12 is a playground 4
Faces the engaging recessed portion 4b in the state in which the forward stop position is taken. The guide hole 2a can be formed in the barrel 1.

Then, a lock driving device 11 for driving the lock member 12 movably arranged in the guide hole 2a in the radial direction of the barrel 1, that is, in the vertical direction is arranged. The lock drive device 11 includes a double-acting first cylinder device 25 that drives the lock member 12 in the radial direction of the barrel 1 as shown in FIG.
It has a double-acting second cylinder device 35 driven by a cam member 10 provided on the cam drum 9 side, and a cam member 10 for reciprocally driving a second piston 35b of the second cylinder device 35 in the forward and reverse directions. The first cylinder device 25 and the second cylinder device 35 are arranged in the housing 18 having a predetermined shape.

The lock driving device 11 will be described with reference to FIG. The first cylinder device 25 includes the housing 18
The first cylinder portion 25a and the first cylinder portion 2
A first piston 25b slidably engaged with 5a;
The first pressure chamber A is defined below the first piston 25b, and the second pressure chamber B is defined above the first piston 25b. The first piston rod 25c has a lower end fixed to the first piston 25b, and an intermediate part that penetrates the upper wall 18a of the housing 18 functioning as a rod cover slidably and liquid-tightly via a seal ring 17a, and has an upper end. The portion is fixed to the lock member 12. Specifically, the upper end of the first piston rod 25c protruding from the housing 18 is
The outer flange portion 25d formed on the c and the nut 15 are sandwiched between the lower end portion of the lock member 12. The lower surface of the outward flange portion 25d is brought into contact with the upper surface of the upper wall 18a so that the lowering position of the lock member 12 is restricted.

The second cylinder device 35 includes a housing 18
The second cylinder portion 35a and the second cylinder portion 3
A second piston 35b slidably engaged with 5a;
2 has a piston rod 35c and defines a third pressure chamber C to the right of the second piston 35b in FIG.
The fourth pressure chamber D is partitioned to the left of 5b. The second piston rod 35c has a middle portion fixed to the second piston 35b and a right end portion that penetrates the right wall 18b of the housing 18 that functions as a rod cover slidably and liquid-tightly via a seal ring 17b, and has a left end portion. The left wall 18c of the housing 18 whose part functions as a rod cover is attached to the seal ring 17c.
It is slidable and liquid-tightly penetrates through.

The first cylinder portion 25a and the second cylinder portion 25a
In order to partition the cylinder portion 35a, an auxiliary housing 18d having a predetermined shape is formed inside the housing 18. The first pressure chamber A of the first cylinder device 25 and the third pressure chamber C of the second cylinder device 35 communicate with each other through the first liquid passage 40 defined between the housing 18 and the auxiliary housing 18d. The second pressure chamber B of the first cylinder device 25 and the fourth pressure chamber D of the second cylinder device 35 communicate with each other through the second liquid passage 41 defined between the housing 18 and the auxiliary housing 18d. 1st to 4th
In the pressure chambers A to D and the first and second liquid passages 40 and 41,
It is filled with hydraulic fluid such as oil.

The cam member 10 is a central shaft 8 of the cam drum 9.
The cylindrical portion 10a is externally fitted and fixed to the front end portion of the above, and the first cam surface 10b and the second cam surface 10c that face each other are formed in the annular portion formed at a predetermined distance in the central axis direction. First
The distance between the cam surface 10b and the second cam surface 10c substantially matches the length of the second piston rod 35c at any position in the circumferential direction. Thus, the first cam surface 10b and the second cam surface 10c form inclined surfaces that change forward and backward in the circumferential direction, and the first cam surface 10b and the second cam surface 10c.
With the second piston rod 35c received between the second piston rod 35c and the second piston rod 35c, the central shaft 8 of the cam drum 9 and the cam member 10 rotate integrally with each other.
The piston 35b can be reciprocally driven in the left-right direction.

Now, the first cam surface 10b and the second cam surface 1
When the second piston rod 35c and the second piston 35b are driven to the right by 0c, the hydraulic fluid in the third pressure chamber C flows into the first pressure chamber A through the first liquid passage 40, Since the piston 25b and the first piston rod 25c are driven to rise, the lock member 12 integrated with the first piston rod 25c rises. Further, if the second piston rod 35c and the second piston 35b are driven leftward by the first cam surface 10b and the second cam surface 10c, the hydraulic fluid in the fourth pressure chamber D will be the second fluid passage 41. Through the second pressure chamber B through the first piston 25b and the first piston rod 2
Since 5c is driven to descend, the lock member 12 integrated with the first piston rod 25c descends. In addition, in the present embodiment, the pressure receiving areas of the first piston 25b and the second piston 35b are matched, but they may not be matched by force.

The first cam surface 10b and the second cam surface 10
A predetermined relationship is given to the drive of the second piston rod 35c by c and the drive of the play bottom 4 by the cam groove 9a of the cam drum 9. First, during rotation of the cam drum 9 during the forward movement of the breech bolt 4 and the backward movement thereof, as shown in FIG.
As shown in, the second piston rod 35c and the second piston 35b are located at the left end, and the first piston 25b and the lock member 12 are in the lowered position. Then, the second piston rod 35c is driven while the play bottom 4 takes the forward stop stroke by the rotation of the cam drum 9.
That is, the second piston rod 35c and the second piston 35b are driven in the right direction immediately after the play bottom 4 takes the forward stop stroke, are driven in the right direction by a predetermined distance, and then stop at a predetermined position. At the end of the forward stop stroke of the breech bolt 4, it is driven to return to the left, and the return position is given before the breech bolt 4 starts the backward stroke.

A third cylinder device 45 is formed in the auxiliary housing 18d. The third cylinder device 45 includes a third cylinder portion 45 defined in the auxiliary housing 18d.
a and a third cylinder portion 45a slidably engaged with the third
It has a piston 45b, an air chamber F is defined above the third piston 45b, and a fifth pressure chamber E is defined below the third piston 45b. The air chamber F is communicated with the outside through the ventilation hole 18e. And the third piston 45
b is elastically pressed downward by the spring 22 which is an elastic body, and is constantly pressed to a predetermined pressure by the working fluid filled in the fifth pressure chamber E, the first communication passage 42 and the second communication passage 43 described later. Are applied, and accordingly, the first to fourth pressure chambers A to D and the first and fourth pressure chambers
The same predetermined pressure is also applied to the hydraulic fluid in the second fluid passages 40 and 41.

A first communication passage 42 and a second communication passage 43 are formed at the lower end of the auxiliary housing 18d, and the first communication passage 42 allows the fifth pressure chamber E, the third pressure chamber C, and the first pressure chamber C to be connected to each other. The pressure chamber A is connected to the second communication passage 43, and
The pressure chamber E is connected to the fourth pressure chamber D and the second pressure chamber B. In the first communication passage 42, the fifth pressure chamber E to the third
A first check valve 46 that allows the flow of the hydraulic fluid toward the pressure chamber C and the first pressure chamber A and blocks the reverse flow is provided, and the second communication passage 43 is provided with the first check chamber E to the fifth check chamber E. A second check valve 47 is provided that allows the flow of the hydraulic fluid toward the fourth pressure chamber D and the second pressure chamber B and blocks the reverse flow.

Next, the operation of the above embodiment will be described. Due to the rotation of the cam drum 9, the breech bolt 4 is given a forward-forward stop-backward action, and while the forward turret is stopped, the rear end of the barrel 1 is closed by the breech bolt 4 and a bullet is fired. . The lock member 12 is moved up and down in accordance with the forward movement, forward movement stop, and backward movement of the breech bolt 4, and the breech bolt 4 is closed, held closed, and released.

The forward stroke-forward stop stroke-backward stroke of the breech bolt 4 will be described in detail with reference to the stroke diagram I of the breech bolt shown in FIG. While the cam drum 9 rotates from 0 ° to θ ₁ °, the breech bolt 4 advances by S ₁ to complete the forward stroke, and while the cam drum 9 rotates to θ ₂ °, the breech bolt 4 stops at the forward movement position. The breech bolt 4 moves backward while the cam drum 9 rotates by θ ₃ °. In this way, the cam drum 9 is 360 °
By rotating, the breech bolt 4 returns to the original retracted position. The bullet is fired while the cam drum 9 rotates in the range of θ ₂ °. Further, the ammunition 13 is pushed into the barrel 1 while the cam drum 9 rotates in the range of θ ₁ ° and the breech bolt 4 advances. When the cam drum 9 rotates in the range of θ ₃ ° and the breech bolt 4 retracts, the cartridge case of the ammunition 13 is pulled out by the breech bolt 4. Furthermore, the cam drum 9 is between θ ₃ ° and θ ₁ °
While the breech hole 4 is retreating and moving forward by revolving the range, the extracted shell case is released to the outside, and a new ammunition 13 is sent to the front of the breech hole 4 by the bullet sending mechanism of the bullet sending part 3. .

By the rotation of the cam drum 9 as described above, the cam member 10 fixed to the central shaft 8 of the cam drum 9 also integrally rotates. When the breech bolt 4 has moved forward sufficiently and the front end portion has approached the rear end portion of the barrel 1, and the breech bolt 4 has taken the forward stop stroke,
The first cam surface 10b of the cam member 10 moves the second piston rod 35c and the second piston 35b in the right direction, and the lock member 12 is driven upward as described above. That is, the cam drum 9 rotates in the range of θ ₁ ° shown in FIG. 3, the breech hole 4 moves forward by S ₁ , and the breech hole 4 takes a forward stop stroke.
The piston rod 35c and the second piston 35b are driven to the right, and the cam drum 9 rotates in the range of α ₁ ° shown in FIG. 3, whereby the lock member 12 takes the raised position. At this time, since the play bottom 4 takes the forward stop stroke and the lock member 12 faces the engagement recess 4b, the ascending lock member 12 enters the engagement recess 4b and the play bottom 4 is closed. At that time, the first check valve 46 prevents the hydraulic fluid from flowing from the third pressure chamber C and the first pressure chamber A toward the fifth pressure chamber E.

If the cam drum 9 rotates in the range of α ₁ °, the second piston rod 35c and the second piston 3
5b moves with a stroke of S ₂ as shown in the stroke diagram II of the lock member of FIG. 3, and the first piston 25b and the second piston 35b whose pressure receiving areas are substantially the same move by the same distance. The stroke of 12 is also about S ₂ . Further, in the closed state of the play bottom 4, the lock member 12 is fixed via the incompressible hydraulic fluid in a state in which the second piston rod 35c is fixedly sandwiched by the pair of cam surfaces 10b, 10c. By being maintained.

As shown in FIG. 3, the cam drum 9 is θ ₂ °-
While rotating within the range of (α ₁ ° + α ₂ °), lock member 1
2 The raised position is maintained and the playground 4 takes the forward stop stroke.
In addition, a completely closed period can be obtained. In the completely closed period of the play bottom 4, the ammunition 13 is shot and the bullet is shot. Thus, the reaction force caused by the firing of the bullet is firmly supported by the lock member 12 and by extension the frame 2, and a strong force is prevented from acting on the cam drum 9.

When the cam drum 9 is further rotated after the bullet is fired, the second cam surface 10c of the cam member 10 pushes the second piston rod 35c and the second piston 35b to the left to drive the play bottom 4 At the end of the forward stop stroke, the cam drum 9 rotates in the range of α ₂ ° shown in FIG. 3, the lock member 12 is gradually lowered, and the play bottom 4 is returned to the lowered position before the backward stroke is started. As a result, the engagement state between the lock member 12 and the engaging recess 4b of the play bottom 4, that is, the play bottom 4 is obtained.
The closed state of is released. At that time, the second check valve 47 blocks the flow of the hydraulic fluid from the fourth pressure chamber D and the second pressure chamber B toward the fifth pressure chamber E. Of course, the lock member 1
2 descends to a position where it does not hinder the backward movement of the play bottom 4.

Thereafter, the play bottom 4 is rotated by θ ₃ ° of the cam drum 9.
The rotation shifts to the reverse stroke and then shifts to the forward stroke again. The lock member 12 is held at the return position until the play bottom 4 starts to move backward and ends to move forward. Therefore, the movement of the breech bolt 4 in the forward direction and the movement of the front end portion of the breech bolt 4 into the vicinity of the rear end portion of the barrel 1 causes the lock member 12 to move.
It is not hindered by

When the hydraulic fluid in the third pressure chamber C and the first pressure chamber A leaks to the outside, the hydraulic fluid in the fifth pressure chamber E is replenished through the first check valve 46. When the hydraulic fluid in the fourth pressure chamber D and the second pressure chamber B leaks to the outside, the hydraulic fluid in the fifth pressure chamber E is replenished through the second check valve 47.

By the way, in the above-described embodiment, the pair of opposed cam surfaces 10b and 10c sandwiches the ends of the second piston rod 35c to drive them in the forward and reverse directions. Only one end (for example, the left end in FIG. 2) of the rod 35c is slidably and liquid-tightly penetrated through the housing 18, and one end of the second piston rod 35c protruding from the housing 18 is connected to the pair of cam members 10 of the cam member 10. It is also possible to engage the cam surface to form a positive-moving cam and obtain the same action as to drive the second piston rod 35c.

Further, in the above embodiment, the first cylinder device 25 and the second cylinder device 35 are formed in the single housing 18, but the respective cylinder devices 25, 35 are formed.
It is also possible to separately form the above and to make these corresponding pressure chambers communicate with each other by the first and second liquid passages 40 and 41 formed by the pipes, and obtain the same effect. If the cylinder devices 25 and 35 are separately configured, the degree of freedom in the arrangement of the cylinder devices 25 and 35 is improved. Further, as shown in FIG. 3, the second piston rod 35c was driven at the same speed by the pair of cam surfaces 10b and 10c.
It is also possible to appropriately select the cam shapes of 0b and 10c so that the lock member 12 can be driven smoothly. The pressure receiving areas of the first piston 25b and the second piston 35b may be made different, and the stroke of the lock member 12 may be increased or decreased.

[0030]

As will be understood from the above description,
The cannon lock actuating device for a cannon according to the present invention has the following advantages. While maintaining the superiority of an integrated breech bolt that can achieve high firing speed with high strength, small size and light weight, it uses a simple structure lock member and hydraulic breech bolt lock actuator to fire bullets. It is no longer necessary to take the accompanying load on the cam drum. In this way, the structure of the playground lock actuating device is simplified and the number of parts is reduced,
Provided is a reliable breech lock actuating device.

The lock member is driven by the cam drum without depending on the elastic force of the elastic body.
Since the cylinder device is reliably restored by the hydraulic pressure, shock-like operation is suppressed, and the return operation is ensured without being affected by dirt caused by rainwater or propellant gas.
As a result, the reliability of the operation of the playground lock actuator is improved.

Further, the pushing operation of the lock member is performed by the cam member integrated with the cam drum, and the lock member can be prevented from returning while the second cylinder device is kept engaged with the cam member, so that the lock member is carelessly taken. Is less likely to malfunction in returning to the outer diameter direction, and has a simple structure and excellent reliability. On the other hand, since the cam drum is only provided with the cam member, the weight hardly increases.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cannon according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an enlarged main part of the same.

FIG. 3 is a diagram similarly showing a rotation angle of the cam drum-stroke characteristics of the play bottom and the lock member.

FIG. 4 is an explanatory view showing a conventional example.

[Explanation of symbols]

1: barrel, 2: frame, 2a: guide hole, 4: playground, 4
b: engagement recess, 9: cam drum, 10: cam member, 10
b: first cam surface, 10c: second cam surface, 11: lock drive device, 12: lock member, 22: spring (elastic body), 2
5: first cylinder device, 35: second cylinder device, 35
b: piston, 42: first communication passage, 43: second communication passage,
45: third cylinder device, 45b: third piston, 4
6: first check valve, 47: second check valve, A: first pressure chamber,
B: second pressure chamber, C: third pressure chamber, D: fourth pressure chamber,
E: Fifth pressure chamber.

Claims (3)

[Claims] 1. A frame (2) is movably accommodated by a rotating cam drum (9) so as to sequentially perform at least forward movement, forward movement stop, and backward movement in the central axis direction of the barrel (1). A cannon lock actuating device for a machine gun having a cannon (4), wherein an engaging recess (4b) is formed on a surface of the cannon (4) facing the cam drum (9), and a barrel (1) is provided on a side of the frame (2). ), A lock driving device (11) for driving a lock member (12) formed by penetrating a guide hole (2a) extending in the radial direction and movably arranged in the guide hole (2a) in the radial direction of the barrel (1). ) Is arranged, and the lock drive device (11) drives the lock member (12) in the radial direction of the barrel (1), the double-acting first cylinder device (25).
And a double-acting second cylinder device (35), and a cam member (10) provided on the cam drum (9) side for reciprocally driving a piston (35b) of the second cylinder device (35) forward and backward.
And has a play bottom (4) as the cam drum (9) rotates.
The cam member (10) drives the second cylinder device (35) to move the hydraulic fluid in the third pressure chamber (C) of the second cylinder device (35) when the engine shifts from the forward stroke to the forward stop stroke. Supply into the first pressure chamber (A) of the first cylinder device (25), push the lock member (12) in the inner diameter direction, and engage the lock member (12) with the playground (4) in the forward stop position. The cam member (10) drives the second cylinder device (35) by engaging with the recess (4b), and when the breech bolt (4) shifts from the forward stop stroke to the backward stroke, the second cylinder device (35).
Of the hydraulic fluid in the fourth pressure chamber (D) of the first cylinder device (2
5) is supplied into the second pressure chamber (B), and the lock member (1
2) Pulling back 2) in the outer diameter direction to release the engagement between the lock member (12) and the engagement recess (4b) of the breech bolt (4), and the breech bolt lock actuating device for a cannon. 2. A third biased by an elastic body (22)
The third cylinder device (4) in which a predetermined pressure is constantly applied to the hydraulic fluid in the fifth pressure chamber (E) by the piston (45b)
5) is arranged, and the first communication passage (4
2) to communicate with the third pressure chamber (C) and the first pressure chamber (A), and the second communication passage (43) to communicate with the fourth pressure chamber (D) and the second pressure chamber (B). 2. A breech bolt lock actuating device for a machine gun according to claim 1, wherein 3. The first communication passage (42) allows the flow of hydraulic fluid from the fifth pressure chamber (E) to the third pressure chamber (C) and the first pressure chamber (A), and has a reverse direction. A first check valve (46) for blocking the flow is provided, and a fifth check valve (46) is provided in the second communication passage (43).
A second check valve (47) for allowing the flow of the hydraulic fluid from the pressure chamber (E) to the fourth pressure chamber (D) and the second pressure chamber (B) and blocking the reverse flow is provided. 3. A breech block lock actuation device for a cannon according to claim 2, wherein