Torque output firer rotation driving device

Abstract

The invention discloses a firer rotation driving device capable of outputting torque. The firer rotation driving device comprises a hollow shell structure; the igniter is arranged at one end of the hollow shell structure and used for outputting axial power to an inner cavity of the hollow shell structure; the spiral motion structure is located in an inner cavity of the hollow shell structure and used for moving along a spiral track under the action of power output by the igniter; the torque transmission structure is arranged on the hollow shell structure, the torque transmission structure and the hollow shell structure can rotate relative to each other but limit the degree of freedom of relative axial sliding, one part of the torque transmission structure is connected with the spiral motion structure, and the torque transmission structure and the spiral motion structure can slide relative to each other in the axial direction but limit the degree of freedom of relative rotation; therefore, the torque transmission structure is driven by the spiral motion structure to rotate, and the other part of the torque transmission structure is located outside the hollow shell structure to output torque. The pyrotechnic rotation driving device can give full play to the advantages of small size and strong driving capability of the pyrotechnic rotation driving device.

Description

Technical Field

[0001] The present application relates to the technical field of pyrotechnic actuators with output torque, and more particularly to a pyrotechnic rotary drive device with output torque, and more particularly to a pyrotechnic rotary drive device based on a multi-start sliding screw. Background Art

[0002] With the development of technology and the need for stealth aircraft, there is an increasing demand for folding and unfolding rudder wings. However, as the flight speed of aircraft increases, the traditional electrical or reed drive capabilities are increasingly unable to meet mission requirements. Initiators use gunpowder combustion to produce gas to do work, which is small in size but high in energy. Therefore, more and more folding rudder wing unfolding conditions begin to use pyrotechnic drive systems.

[0003] At present, most aircraft use a pyrotechnic linear actuator to drive an external connecting rod or a spiral pair to achieve the deployment of the folding rudder wings. However, with the development of miniaturization of aircraft, the problem of low space utilization of the above-mentioned combined drive form has gradually become prominent. Even if the form of a pyrotechnic actuator plus a spiral pair is adopted, there is still a problem of excessive axial size. Therefore, in recent years, pyrotechnic rotary actuators that directly output torque have also appeared in the industry. However, the current pyrotechnic rotary actuators generally adopt the form of ball screws. Under the huge thrust generated by high-pressure gas, the rolling matching line contact form will cause excessive contact stress, and the transmission pair is prone to plastic deformation and jamming. In addition, due to the limitation of structural size, the existing pyrotechnic rotary actuator cannot be set with a ball circulation structure, and the spiral pair cannot achieve pure rolling in the actual movement, and there is still sliding friction of line contact.

[0004] In summary, the existing pyrotechnic rotary actuators cannot fully utilize the advantages of pyrotechnic products, such as small size and high energy, and the insufficient output torque limits their application. Summary of the invention

[0005] The present application provides a pyrotechnic rotary drive device with output torque. The pyrotechnic rotary drive device is a pyrotechnic rotary actuating device with a small size and a large output torque. The device fully utilizes the advantages of the pyrotechnic actuating device with a small size and a strong driving capability, and its spiral transmission pair is no longer a weak point that limits its output torque.

[0006] In a first aspect, a pyrotechnic rotary drive device for outputting torque is provided, comprising:

[0007] Hollow shell structure;

[0008] An igniter, disposed at one end of the hollow shell structure, for outputting axial power to the inner cavity of the hollow shell structure;

[0009] The spiral motion structure is located in the inner cavity of the hollow shell structure and is used to move along a spiral trajectory under the power output by the igniter, so that the spiral motion structure itself has a rotational motion amount and an axial sliding amount;

[0010] The torque transmission structure is arranged on the hollow shell structure. The torque transmission structure and the hollow shell structure can rotate relative to each other, but the freedom of relative axial sliding is limited. A part of the torque transmission structure is connected to the spiral motion structure. The torque transmission structure and the spiral motion structure can slide relative to each other axially, but the freedom of relative rotation is limited, so that the torque transmission structure rotates under the drive of the spiral motion structure. The other part of the torque transmission structure is located outside the hollow shell structure to output torque.

[0011] In combination with the first aspect, in a first implementation of the first aspect, the spiral motion structure has a motion cavity, the torque transmission structure is rod-shaped, and the part where the torque transmission structure is connected to the spiral motion structure extends into the motion cavity, and the motion cavity is used to provide an axial relative sliding stroke space for the torque transmission structure.

[0012] In combination with the first implementation of the first aspect, in a second implementation of the first aspect, the spiral motion structure includes:

[0013] The piston is used to carry the thrust from the igniter;

[0014] A multi-start lead screw comprises a first part, a second part and a third part; the first part of the multi-start lead screw is used to be fixed to a piston, so that the multi-start lead screw can move along a spiral trajectory relative to a hollow shell structure under the drive of the piston; the second part of the multi-start lead screw is located between the first part and the third part of the multi-start lead screw, and the second part of the multi-start lead screw has a cavity for providing an axial relative sliding stroke space for a torque transmission structure, and the third part of the multi-start lead screw is used to cooperate with the torque transmission structure to limit the freedom of relative rotation between the torque transmission structure and the spiral motion structure.

[0015] In combination with the second implementation of the first aspect, in a third implementation of the first aspect, the piston is a structural member with one end closed and the other end open, the end surface of the piston at the closed end is arranged facing the igniter, and the high-pressure medium output by the igniter acts on the end surface of the closed end of the piston;

[0016] The multi-start screw has a screw cavity connecting the first part and the second part of the multi-start screw, and the open end of the piston is fixedly connected with the open thread of the screw cavity. At the end of the axial sliding stroke of the multi-start screw, the torque transmission structure gradually penetrates into the opening of the piston.

[0017] In combination with the second or third implementation of the first aspect, in the fourth implementation of the first aspect, the third part of the multi-start screw has a screw through hole, which is connected to the bottom of the cavity of the second part of the multi-start screw, and the torque transmission structure passes through the screw through hole. The screw through hole has a keyway, and the torque transmission structure has a key strip, and the keyway and the key strip cooperate to limit the freedom of relative rotation between the torque transmission structure and the spiral motion structure.

[0018] In combination with the second to fourth implementations of the first aspect, in the fifth implementation of the first aspect, the piston is used to be dynamically sealed and connected to the inner cavity wall of the hollow shell structure, and the outer periphery of the multi-start screw has a thread; the inner cavity wall of the hollow shell structure has a threaded track that matches the thread of the spiral motion structure, so that the spiral motion structure can move along a spiral trajectory relative to the hollow shell structure.

[0019] In a second aspect, a pyrotechnic rotary drive device for outputting torque is provided, comprising:

[0020] Hollow shell structure;

[0021] An igniter, disposed at one end of the hollow shell structure, for outputting axial power to the inner cavity of the hollow shell structure;

[0022] The spiral motion structure is located in the inner cavity of the hollow shell structure and is used to move along a spiral trajectory under the power output by the igniter;

[0023] The torque transmission structure is arranged on the hollow shell structure. The torque transmission structure and the hollow shell structure can rotate relative to each other, but the freedom of relative axial sliding is limited. A part of the torque transmission structure is connected to the spiral motion structure. The torque transmission structure and the spiral motion structure can slide relative to each other axially, but the freedom of relative rotation is limited, so that the torque transmission structure rotates under the drive of the spiral motion structure. The other part of the torque transmission structure is located outside the hollow shell structure to output torque.

[0024] In combination with the second aspect, in a first implementation of the second aspect, the spiral motion structure includes:

[0025] The piston is dynamically sealed to the inner cavity wall of the hollow shell structure; the first side of the piston is used to carry the high-pressure medium output by the igniter to push the piston to move away from the igniter;

[0026] A multi-start lead screw is fixedly connected to the second side of the piston. Driven by the piston, the multi-start lead screw can move along a spiral trajectory relative to the hollow shell structure. The multi-start lead screw has a lead screw cavity and a lead screw through hole. The lead screw through hole is connected to the bottom of the lead screw cavity. The torque transmission structure passes through the lead screw through hole. During the movement of the multi-start lead screw, the torque transmission structure gradually penetrates into the lead screw cavity.

[0027] In combination with the first implementation method of the second aspect, in the second implementation method of the second aspect, the piston is a structural member with one end closed and the other end open, and the end face of the piston at the closed end is arranged facing the igniter, and the high-pressure medium output by the igniter acts on the end face of the closed end of the piston, and the open end of the piston is fixedly connected to the opening thread of the screw cavity. At the end of the axial sliding stroke of the multi-head screw, the torque transmission structure gradually penetrates into the opening of the piston.

[0028] In combination with the first aspect, any one of the first to fifth implementations of the first aspect, in the sixth implementation of the first aspect, or in combination with certain implementations of the second aspect, the outer periphery of the spiral motion structure has a thread; the inner cavity wall of the hollow shell structure has a threaded track that matches the thread of the spiral motion structure, so that the spiral motion structure can move along a spiral trajectory relative to the hollow shell structure.

[0029] In combination with the sixth implementation of the first aspect, in a seventh implementation of the first aspect, or in combination with certain implementations of the second aspect, the hollow shell structure includes:

[0030] A housing having an actuating cavity;

[0031] The screw nut, the outer periphery of the screw nut cooperates with the wall of the actuating cavity of the shell, and limits the freedom of relative rotation and relative axial sliding of the screw nut and the shell, and the inner wall of the screw nut cooperates with the outer peripheral thread of the spiral motion structure, so that the spiral motion structure can move along a spiral trajectory relative to the screw nut in the actuating cavity.

[0032] In combination with the seventh implementation of the first aspect, in the eighth implementation of the first aspect, or in combination with certain implementations of the second aspect, the freedom of relative rotation between the lead screw nut and the housing is limited by a spline;

[0033] The wall of the actuating cavity of the housing is provided with a step, and the side of the lead screw nut away from the igniter abuts against the step to limit the freedom of the lead screw nut to move axially away from the igniter;

[0034] The hollow shell structure also includes a charge body, which is located on a side of the shell close to the igniter. The charge body is provided with a power cavity, the opening of which extends into the actuating cavity of the shell and is fixedly connected with threads. The actuating cavity of the shell is connected to the power cavity of the charge body to form an inner cavity of the hollow shell structure. The end face of the charge body close to the shell abuts against the screw nut to limit the freedom of the screw nut to move axially toward the igniter.

[0035] In combination with the eighth implementation manner of the first aspect, in the ninth implementation manner of the first aspect, or in combination with certain implementation manners of the second aspect, the charge body further has two exhaust holes connected to the power chamber, the igniter is sealably mounted at one end of the charge body, and the igniter output end is connected to the two exhaust holes of the charge body to output high-pressure medium to the inner cavity of the hollow shell structure.

[0036] In a third aspect, a pyrotechnic rotary drive device based on a multi-start sliding screw is provided, comprising:

[0037] A charge body, the charge body is provided with a power cavity and two exhaust holes communicated with the power cavity;

[0038] The igniter is sealed and installed at one end of the charge body, and the output end of the igniter is connected with two exhaust holes of the charge body to output high-pressure medium to the power chamber;

[0039] The shell has an actuating cavity, the opening of the actuating cavity is threadedly fixedly connected to the opening of the power cavity of the charge body, and the actuating cavity of the shell is communicated with the power cavity of the charge body;

[0040] The piston, in the initial state, is dynamically sealed and installed in the power cavity of the charge body; the piston is a structural member with one end closed and the other end open, and the end surface of the piston at the closed end faces the igniter, and the high-pressure medium output by the igniter acts on the end surface of the closed end of the piston to push the piston to move toward the housing;

[0041] A multi-threaded screw, which is accommodated in an actuating cavity of a housing, has a screw cavity and a screw through hole, an opening of the screw cavity and an opening of a piston are fixedly connected by threads, and the screw through hole is connected to the bottom of the screw cavity; the multi-threaded screw can move along a spiral trajectory relative to the housing;

[0042] A torque transmission structure, wherein the middle section of the torque transmission structure passes through the bottom of the actuating cavity of the housing, an end of the torque transmission structure close to the igniter passes through the screw through hole of the multi-threaded screw and extends into the screw cavity, and a structure for transmitting torque is provided at the end of the torque transmission structure away from the igniter; the torque transmission structure and the housing can rotate relative to each other, but the freedom of axial sliding between the torque transmission structure and the housing is limited; the multi-threaded screw and the torque transmission structure can slide axially, but the freedom of relative rotation between the multi-threaded screw and the torque transmission structure is limited;

[0043] During operation, under the thrust of the igniter, the piston and the multi-head screw move axially away from the igniter, the multi-head screw gradually penetrates into the actuating cavity of the shell, and at the same time rotates along a spiral trajectory; the torque transmission structure rotates relative to the shell under the drive of the multi-head screw, and at the same time the torque transmission structure gradually penetrates into the connecting space between the piston cavity and the screw cavity.

[0044] In combination with the third aspect, in a first implementation method of the third aspect, a screw nut is further provided in the actuating chamber of the shell; the outer periphery of the screw nut cooperates with the cavity wall of the actuating chamber of the shell, and limits the freedom of relative rotation and relative axial sliding of the screw nut and the shell, and the inner wall of the screw nut cooperates with the outer peripheral thread of the spiral motion structure, so that the spiral motion structure can move along a spiral trajectory relative to the screw nut in the actuating chamber.

[0045] In combination with the first implementation of the third aspect, in the second implementation of the third aspect, a step is provided on the wall of the actuating cavity of the housing, and a side of the lead screw nut facing away from the igniter abuts against the step to limit the freedom of the lead screw nut to move axially away from the igniter;

[0046] The end surface of the charge body close to the shell abuts against the lead screw nut to limit the freedom of the lead screw nut to move axially toward the igniter.

[0047] In combination with the first or second implementation of the third aspect, in a third implementation of the third aspect, the freedom of relative rotation between the screw nut and the housing is limited by a spline.

[0048] In combination with any one of the first to third implementation methods of the third aspect, in the fourth implementation method of the third aspect, the number of threads that match the screw nut and the spiral motion structure is 10 to 20, the helix angle is not less than 50°, and the tooth profile is a 30° standard trapezoidal thread or rectangular thread.

[0049] In combination with the eighth or ninth implementation of the first aspect, in the tenth implementation of the first aspect, or in combination with certain implementations of the second aspect or the third aspect, the cooperation between the charge body and the piston satisfies at least one of the following:

[0050] The inner wall of the charge body has a step to limit the axial position of the piston in the initial state;

[0051] When the piston is at the maximum axial sliding stroke, the piston is still matched with the inner wall of the charge body through the O-ring.

[0052] In combination with the first aspect and any one of the first to tenth implementations of the first aspect, in the eleventh implementation of the first aspect, or in combination with some implementations of the second aspect and the third aspect, the hollow shell structure has a limiting through hole at one end away from the igniter, the limiting through hole is connected to the bottom of the inner cavity of the hollow shell structure and passes through the torque transmission structure; the torque transmission structure has an annular boss, the annular boss is accommodated in the inner cavity of the hollow shell structure, the outer diameter of the annular boss is larger than the inner diameter of the limiting through hole, the annular boss of the torque transmission structure abuts against the bottom of the inner cavity of the hollow shell structure, thereby limiting the freedom of the torque transmission structure to move axially toward the igniter;

[0053] On the side of the limiting through hole of the hollow shell structure that is away from the annular boss, the torque transmission structure has an annular groove for installing an elastic retaining ring for the shaft, and the outer diameter of the elastic retaining ring is larger than the inner diameter of the limiting through hole, thereby limiting the freedom of the torque transmission structure to move axially away from the igniter through the elastic retaining ring for the shaft.

[0054] In combination with the first aspect, any one of the first to eleventh implementations of the first aspect, in the twelfth implementation of the first aspect, or in combination with certain implementations of the second aspect and the third aspect, the pyrotechnic rotation drive device also includes a locating pin, which passes transversely through the hollow shell structure and is inserted into the torque transmission structure to achieve initial fixation.

[0055] In a fourth aspect, an aircraft is provided, comprising a pyrotechnic rotation drive device as described in any one of the implementations of the first to third aspects above.

[0056] Compared with the prior art, the solution provided by this application includes at least the following beneficial technical effects:

[0057] (1) The present invention directly outputs torque. Compared with the traditional method of converting the pyrotechnic linear drive into torque via an external spiral pair, the axial dimension is shortened by at least 50%, and the volume is smaller and the weight is lighter.

[0058] (2) The present invention adopts a multi-start sliding helical pair screw and a multi-start sliding spline to realize helical transmission. Compared with the point / line contact of the ball screw pair, the helical pair of the present invention is a surface contact with a large contact area and a small contact stress under the same torque, so the limit output torque is larger.

[0059] (3) Compared with the lateral arrangement of the rotary actuator of the igniter, the axial arrangement of the igniter of the present invention can facilitate the entire product to be embedded in the rudder wing shaft, which is more conducive to the overall structural layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic structural diagram of a pyrotechnic rotation drive device for outputting torque provided by the present invention.

[0061] Figure 2 A schematic structural diagram of another pyrotechnic rotation drive device for outputting torque provided by the present invention.

[0062] Figure 3 A structural schematic diagram of a spiral motion structure provided by the present invention.

[0063] Figure 4 A schematic structural diagram of a hollow shell structure provided by the present invention.

[0064] Figure 5 This is a simplified structural diagram of Example 1 of the present invention (not working).

[0065] Figure 6 This is a schematic diagram of the shell structure of Example 1 of the present invention.

[0066] Figure 7 It is a structural schematic diagram of the torque transmission structure of embodiment 1 of the present invention.

[0067] Figure 8 This is a schematic diagram of the structure of the multi-start lead screw in Example 1 of the present invention.

[0068] Fig. 9 This is a schematic structural diagram of the lead screw nut according to embodiment 1 of the present invention.

[0069] Fig.10 This is a schematic diagram of the structure of Example 1 of the present invention after it works. DETAILED DESCRIPTION

[0070] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] like Figure 1 and Figure 2 As shown, the present invention is a pyrotechnic rotation drive device for outputting torque, comprising: a hollow shell structure A, an igniter 1, a spiral motion structure B, and a torque transmission structure 7. The igniter 1 is arranged at one end of the hollow shell structure A, and is used to output axial power to the inner cavity of the hollow shell structure A. The spiral motion structure B is located in the inner cavity of the hollow shell structure A, and is used to move along a spiral trajectory under the power output by the igniter 1. The torque transmission structure 7 is arranged on the hollow shell structure A, and the torque transmission structure 7 and the hollow shell structure A can rotate relative to each other, but the freedom of relative axial sliding is limited. A part of the torque transmission structure 7 is connected to the spiral motion structure B, and the torque transmission structure 7 and the spiral motion structure B can slide relative to each other axially, but the freedom of relative rotation is limited, so that the torque transmission structure 7 rotates under the drive of the spiral motion structure B, and the other part of the torque transmission structure 7 is located outside the hollow shell structure A to output torque.

[0072] Since the torque transmission structure 7 and the spiral motion structure B can slide axially relative to each other, one of the torque transmission structure 7 and the spiral motion structure B can provide an axial sliding stroke space for the other. Figure 1 In the embodiment shown, the spiral motion structure B has a motion cavity, the torque transmission structure 7 is rod-shaped, and the portion of the torque transmission structure 7 connected to the spiral motion structure B extends into the motion cavity, which is used to provide an axial relative sliding stroke space for the torque transmission structure 7. Figure 2In the illustrated embodiment, the torque transfer structure 7 has a motion cavity, and one end of the spiral motion structure B close to the torque transfer structure 7 is rod-shaped. The torque transfer structure 7 and the connected part of the spiral motion structure B extend into the motion cavity, and the motion cavity is used to provide an axial relative sliding travel space for the torque transfer structure 7.

[0073] and Figure 2 Compared to the embodiment shown, Figure 1 The outer periphery of the spiral motion structure B can have a relatively long mating length with the inner wall of the hollow shell structure A, so a variety of mating relationships can be formed between the outer periphery of the spiral motion structure B and the inner wall of the hollow shell structure A to fully improve the overall performance of the pyrotechnic rotary drive device. For example, a sealing ring can be provided on the outer periphery of the spiral motion structure B at one end of the spiral motion structure B close to the igniter 1. As the spiral motion structure B moves, the sealing ring on the spiral motion structure B can always form a dynamic seal with the inner wall of the hollow shell structure A. In addition, the outer peripheral portion of the spiral motion structure B that does not participate in the dynamic seal can be provided with a thread, and a track that constrains the spiral motion structure B to perform spiral motion can be provided on the inner cavity wall of the hollow shell structure A, and the two cooperate with each other to enable the spiral motion structure B to move along a spiral trajectory relative to the hollow shell structure A. In addition, the track can be located outside the overall stroke of the sealing ring on the spiral motion structure B, that is, the two will not interfere with each other.

[0074] Combination Figure 1 In some embodiments, as Figure 3 As shown, the spiral motion structure B can realize dynamic sealing and spiral motion trajectory respectively through two structural parts. The spiral motion structure B can include a piston 4 and a multi-start screw 5. The piston 4 is used to realize dynamic sealing (for example, through an O-ring 3) and can also bear the thrust from the igniter 1. The multi-start screw 5 is used to realize the spiral motion trajectory and cooperates with the torque transmission structure 7 to drive the torque transmission structure 7 to rotate together.

[0075] like Figure 3 As shown, the multi-start screw 5 can be divided into a first part, a second part and a third part; the first part of the multi-start screw 5 is used to be fixed to the piston 4, so that the multi-start screw 5 can move along a spiral trajectory relative to the hollow shell 8 structure A under the drive of the piston 4; the second part of the multi-start screw 5 is located between the first part and the third part of the multi-start screw 5, and the second part of the multi-start screw 5 has a cavity for providing an axial relative sliding stroke space for the torque transmission structure 7, and the third part of the multi-start screw 5 is used to cooperate with the torque transmission structure 7 to limit the freedom of relative rotation between the torque transmission structure 7 and the spiral motion structure B.

[0076] In order not to increase the axial length of the multi-start screw 5, the axial relative sliding travel space of the torque transmission structure 7 can also be provided by the piston 4. Figure 3 As shown, the piston 4 is a structural component with one end closed and the other end open. The end face of the closed end of the piston 4 is arranged to face the igniter 1, and the high-pressure medium output by the igniter 1 acts on the end face of the closed end of the piston 4; the multi-start lead screw 5 has a first part and a second part of a lead screw cavity connecting the multi-start lead screw 5, and the open end of the piston 4 is fixedly connected to the opening thread of the lead screw cavity. At the end of the axial sliding stroke of the multi-start lead screw 5, the torque transmission structure 7 gradually penetrates into the opening of the piston 4.

[0077] In some embodiments, the third portion of the multi-start screw 5 and the torque transmission structure 7 can be matched by a key bar and a key slot to limit the freedom of relative rotation of the torque transmission structure 7 and the spiral motion structure B. In addition, the matching of the key bar and the key slot can also provide a guiding function for axial motion, so that the rotation of the torque transmission structure 7 is driven as purely as possible by the spiral motion structure B, thereby improving the rotation accuracy of the torque transmission structure 7.

[0078] like Figure 3 As shown, the third part of the multi-start screw 5 has a screw through hole, which is connected to the bottom of the cavity of the second part of the multi-start screw 5. The torque transmission structure 7 passes through the screw through hole. The screw through hole has a keyway, and the torque transmission structure 7 has a key strip. The keyway and the key strip cooperate to limit the freedom of relative rotation between the torque transmission structure 7 and the spiral motion structure B.

[0079] In some embodiments provided in the present application, the lead screw nut 6 can be independently arranged in the housing 8, so that the inner cavity wall of the hollow housing 8 structure A has a track that constrains the spiral motion structure B to perform spiral motion. Figure 4 As shown, the hollow shell 8 structure A may include a shell 8 and a lead screw nut 6. The outer periphery of the lead screw nut 6 cooperates with the wall of the actuating cavity of the shell 8 and limits the freedom of relative rotation and relative axial sliding of the lead screw nut 6 and the shell 8. The inner wall of the lead screw nut 6 cooperates with the outer peripheral thread of the spiral motion structure B, so that the spiral motion structure B can move along a spiral trajectory relative to the lead screw nut 6 in the actuating cavity.

[0080] The relative rotational freedom between the screw nut 6 and the housing 8 can be limited by splines. Figure 4In the embodiment shown, the freedom of relative axial sliding of the screw nut 6 and the housing 8 can be achieved by limiting the positions on both sides of the screw nut 6. Among them, the wall of the actuating cavity of the housing 8 is provided with a step, and the side of the screw nut 6 away from the igniter 1 abuts on the step to limit the freedom of the screw nut 6 to move axially away from the igniter 1. The hollow housing 8 structure A also includes a charge body 2, which is located on the side of the housing 8 close to the igniter 1. The charge body 2 is provided with a power cavity, the opening of which extends into the actuating cavity of the housing 8 and is fixedly connected by threads. The actuating cavity of the housing 8 is connected with the power cavity of the charge body 2 to form the inner cavity of the hollow housing 8 structure A, and the end face of the charge body 2 close to the housing 8 abuts on the screw nut 6 to limit the freedom of the screw nut 6 to move axially toward the igniter 1.

[0081] In some embodiments provided in the present application, the hollow shell 8 structure A and the hollow shell 8 structure A limit the relative axial sliding can be realized on the side of the hollow shell 8 structure A away from the igniter 1. Figure 4 As shown, the hollow shell 8 structure A has a limiting through hole at the end away from the igniter 1, the limiting through hole is connected to the bottom of the inner cavity of the hollow shell 8 structure A, and passes through the torque transmission structure 7; the torque transmission structure 7 has an annular boss, the annular boss is accommodated in the inner cavity of the hollow shell 8 structure A, the outer diameter of the annular boss is larger than the inner diameter of the limiting through hole, and the annular boss of the torque transmission structure 7 abuts against the bottom of the inner cavity of the hollow shell 8 structure A, thereby limiting the freedom of the torque transmission structure 7 to move axially toward the igniter 1.

[0082] The main axial load of the torque transmission structure 7 comes from the thrust output by the igniter 1. In some embodiments, the torque transmission structure 7 can also be limited in the opposite direction of the thrust output by the igniter 1. Figure 4 As shown, on the side of the limiting through hole of the hollow shell 8 structure A that is away from the annular boss, the torque transmission structure 7 has an annular groove to install the shaft elastic retaining ring 11, and the outer diameter of the elastic retaining ring 11 is larger than the inner diameter of the limiting through hole, thereby limiting the freedom of the torque transmission structure 7 to move axially away from the igniter 1 through the shaft elastic retaining ring 11.

[0083] Example 1

[0084] The present invention provides a pyrotechnic rotary drive device based on a multi-start sliding screw, comprising an igniter 1, a charge body 2, a piston 4, a multi-start screw 5, a torque transmission structure 7, and a housing 8.

[0085] The charge body 2 is provided with a power chamber I and two exhaust holes connected to the power chamber I. The igniter 1 is installed on the left side of the charge body 2 and sealed therewith, and the output end of the igniter 1 is connected to the two exhaust holes to output high-pressure medium to the power chamber I.

[0086] The housing 8 has an actuating cavity. At the end of the charge body 2 away from the igniter 1, i.e., the opening of the power cavity I, the opening of the actuating cavity is threadedly fixedly connected with the opening of the power cavity I of the charge body 2. The actuating cavity of the housing 8 is connected with the power cavity I of the charge body 2 to form a cavity for accommodating the piston 4 and the multi-start screw 5. Figure 6 As shown, the housing 8 may also be provided with a mounting lug 82 or a flange on the outside for fixing.

[0087] The piston 4 is a structural member with one end closed and the other end open. In the initial state, the piston 4 is installed in the power chamber I of the charge body 2, and is dynamically sealed with the charge body 2 through the O-ring 3. The end surface of the piston 4 at the closed end faces the igniter 1, and the high-pressure medium output by the igniter 1 acts on the end surface of the closed end of the piston 4 to push the piston 4 toward the housing 8. In some embodiments, the inner wall of the charge body 2 may have a step to limit the axial position of the piston 4 in the initial state.

[0088] Combination Figure 5 and Figure 8 The multi-start lead screw 5 has a lead screw cavity and a lead screw through hole. The lead screw cavity is located at one end of the multi-start lead screw 5 close to the igniter 1, and the opening of the lead screw cavity is threadedly fixedly connected to the opening of the piston 4. The cavity of the piston 4 at the open end is the piston cavity, and the piston cavity is connected to the lead screw cavity. The lead screw through hole of the multi-start lead screw 5 is connected to the bottom of the lead screw cavity, and the lead screw through hole is used to pass through the torque transmission structure 7. A counterpart 74 or other structure for transmitting torque is provided at the end of the torque transmission structure 7 away from the igniter 1.

[0089] As mentioned above, the piston 4 can drive the multi-start screw 5 to move toward the housing 8, wherein, when the piston 4 is at the maximum stroke, the piston 4 is still engaged with the inner wall of the charge body 2 through the O-ring 3. The multi-start screw 5 gradually enters the actuating cavity of the housing 8 during the driving process. Under the thrust of the piston 4, the multi-start screw 5 not only slides relative to the housing 8, but also rotates at the same time through the spiral trajectory constraint. The multi-start screw 5 and the torque transmission structure 7 can slide axially, but the freedom of relative rotation between the multi-start screw 5 and the torque transmission structure 7 is limited (for example, by Figure 7The splines 71, etc. of the multi-start lead screw 5 and the sliding splines of the torque transmission structure 7 are generally evenly distributed 4 to 8, which can be flexibly selected according to the structural layout and the output torque size). The torque transmission structure 7 and the housing 8 can rotate relative to each other, but the freedom of axial sliding between the torque transmission structure 7 and the housing 8 is limited. Therefore, when the multi-start lead screw 5 rotates, the torque transmission structure 7 can rotate relative to the housing 8 driven by the multi-start lead screw 5. Since the axial movement of the torque transmission structure 7 relative to the housing 8 is limited, the degree to which the torque transmission structure 7 extends into the connecting space between the piston cavity and the lead screw cavity gradually increases during the rotation process.

[0090] In summary, when working, the igniter 1 discharges high-pressure gas into the power chamber I through the small hole, driving the piston 4 to move toward the housing 8. Under the action of the spiral trajectory, the multi-start screw 5 generates rotation while moving axially, and transmits the rotation to the torque transmission structure 7, so that the torque transmission structure 7 generates pure rotation and outputs torque. The state after working is as follows Fig.10 shown.

[0091] In some embodiments, Figure 8 and Fig. 9 As shown, the outer periphery of the multi-start lead screw 5 may have a thread 52. The housing 8 is further provided with a lead screw nut 6 in the actuating chamber. The inner wall of the lead screw nut 6 has a thread track that cooperates with the thread 52, and the thread 52 and the thread track can form a multi-start sliding spiral pair, thereby forming the above-mentioned spiral track. Therefore, the multi-start lead screw 5 can rotate relative to the lead screw nut 6 while sliding relative to the lead screw nut 6. In some other embodiments, the setting positions of the thread and the thread track can be reversed.

[0092] exist Figure 8 and Fig. 9 In the embodiment shown, the screw pair composed of the multi-start screw 5 and the screw nut 6 can form a self-locking state in the initial state. The number of threads 52 is generally 10 to 20, the helix angle of the threads 52 is not less than 50°, and the tooth profile is a 30° standard trapezoidal thread or rectangular thread.

[0093] In addition, the freedom of axial sliding and the freedom of relative rotation are restricted between the screw nut 6 and the housing 8, so that the multi-head screw 5 and the housing 8 can slide axially relative to each other and rotate relative to each other, and the multi-head screw 5 can rotate relative to the housing 8 while sliding relative to the housing 8.

[0094] like Figure 5As shown, the inner wall of the actuating cavity of the shell 8 may have a step. During installation, the lead screw nut 6 may be inserted from the opening of the shell 8 facing the piston 4, and the lead screw nut 6 may abut against the step of the inner wall of the shell 8 to limit the freedom of the lead screw nut 6 to move axially away from the igniter 1. The end of the lead screw nut 6 facing the igniter 1 may be limited by the charge body 2. At the end of the charge body 2 close to the shell 8, the outer circumference of the charge body 2 has a thread, and the inner side of the actuating cavity of the shell 8 has a corresponding thread at the end close to the charge body 2. Therefore, when the charge body 2 and the shell 8 are threadedly fixedly connected, the end of the charge body 2 close to the shell 8 can extend into the actuating cavity of the shell 8, so that the end face of the charge body 2 close to the shell 8 can abut against the lead screw nut 6, thereby limiting the freedom of the lead screw nut 6 to move axially toward the igniter 1.

[0095] The freedom of relative rotation between the screw nut 6 and the housing 8 can be limited, for example, by a spline. Figure 6 and Fig. 9 As shown, the actuating cavity of the housing 8 has multiple keyways 81 evenly distributed at positions corresponding to the screw nut 6, and the outer circumference of the screw nut 6 has multiple key strips evenly distributed correspondingly, and the multiple key strips cooperate with the multiple keyways 81. The number of fixed splines between the screw nut 6 and the housing 8 is generally 2 to 4 evenly distributed, which can be flexibly selected according to the structural layout and the output torque. In some other embodiments, the setting positions of the keyways and key strips can be reversed.

[0096] In some other embodiments, the spiral structure that cooperates with the multi-start screw 5 can be directly arranged on the housing 8, that is, the screw nut 6 is omitted.

[0097] In some embodiments, in combination Figure 5 The housing 8 has a limiting through hole at one end away from the charge body 2, the limiting through hole is connected to the bottom of the actuating cavity and passes through the torque transmission structure 7. The torque transmission structure 7 may be provided with an annular boss 72 at the middle position, the outer diameter of the annular boss 72 is smaller than the inner diameter of the actuating cavity and larger than the inner diameter of the limiting through hole. Figure 5 In the embodiment shown, the annular boss 72 of the torque transmission structure 7 can abut against the bottom of the actuating cavity directly or indirectly (for example, through the gasket 9), thereby limiting the freedom of the torque transmission structure 7 to move axially toward the igniter 1. The gasket 9 is made of, for example, a high-strength, high-hardness wear-resistant material, such as 60Si2MnA, HRC ≥ 55, with molybdenum disulfide sputtered on the surface and grease applied to achieve protection and lubrication. In addition, on the side of the limiting through hole of the housing 8 away from the annular boss 72, the torque transmission structure 7 has an annular groove 73 for installing the shaft elastic retaining ring 11, the outer diameter of the elastic retaining ring 11 is larger than the inner diameter of the limiting through hole, so that the freedom of the torque transmission structure 7 to move axially away from the igniter 1 can be limited by the shaft elastic retaining ring 11.

[0098] In some embodiments, in the initial state, the axial movement and relative rotation of the torque transmission structure 7 relative to the housing 8 can be limited by the positioning pin 10 to achieve initial fixation. Figure 5 and Fig.10 As shown, a positioning pin 10 can be provided at the end of the shell 8 facing away from the igniter 1. The positioning pin 10 transversely passes through the wall of the limiting through hole of the shell 8 and is inserted into the torque transfer structure 7, thereby limiting its axial movement and rotation, thereby achieving initial fixation of the torque transfer structure 7.

[0099] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A pyrotechnic rotary drive device for outputting torque, characterized in that: include: Hollow shell structure (A); An igniter (1) is arranged at one end of the hollow shell structure (A) and is used to output axial power to the inner cavity of the hollow shell structure (A); The spiral motion structure (B) is located in the inner cavity of the hollow shell structure (A) and is used to move along a spiral track under the action of the power output by the igniter (1), so that the spiral motion structure (B) itself has a rotational motion amount and an axial sliding amount; The torque transmission structure (7) is arranged on the hollow shell structure (A). The torque transmission structure (7) and the hollow shell structure (A) can rotate relative to each other, but the freedom of relative axial sliding is limited. A part of the torque transmission structure (7) is connected to the spiral motion structure (B). The torque transmission structure (7) and the spiral motion structure (B) can slide relative to each other axially, but the freedom of relative rotation is limited, so that the torque transmission structure (7) rotates under the drive of the spiral motion structure (B). Another part of the torque transmission structure (7) is located outside the hollow shell structure (A) to output torque.

2. The pyrotechnic rotary drive device according to claim 1, characterized in that: The spiral motion structure (B) has a motion cavity, the torque transmission structure (7) is rod-shaped, and the part of the torque transmission structure (7) connected to the spiral motion structure (B) extends into the motion cavity, and the motion cavity is used to provide an axial relative sliding stroke space for the torque transmission structure (7).

3. The pyrotechnic rotary drive device according to claim 2, characterized in that: The spiral motion structure (B) comprises: A piston (4) for bearing the thrust from the igniter (1); A multi-start lead screw (5) comprises a first part, a second part and a third part; the first part of the multi-start lead screw (5) is used to be fixed to a piston (4), so that the multi-start lead screw (5) can move along a spiral trajectory relative to a hollow shell structure (A) under the drive of the piston (4); the second part of the multi-start lead screw (5) is located between the first part and the third part of the multi-start lead screw (5), and the second part of the multi-start lead screw (5) has a cavity for providing an axial relative sliding stroke space for a torque transmission structure (7); the third part of the multi-start lead screw (5) is used to cooperate with the torque transmission structure (7) to limit the freedom of relative rotation between the torque transmission structure (7) and the spiral motion structure (B).

4. The pyrotechnic rotary drive device according to claim 3, characterized in that: The piston (4) is a structural component with one end closed and the other end open. The end surface of the piston (4) at the closed end faces the igniter (1), and the high-pressure medium output by the igniter (1) acts on the end surface of the closed end of the piston (4). The multi-start lead screw (5) comprises a first part and a second part of a lead screw cavity connected to the multi-start lead screw (5), the opening end of the piston (4) is fixedly connected to the opening thread of the lead screw cavity, and at the end of the axial sliding stroke of the multi-start lead screw (5), the torque transmission structure (7) gradually penetrates into the opening of the piston (4).

5. The pyrotechnic rotation drive device according to claim 3 or 4, characterized in that: The third part of the multi-start screw (5) has a screw through hole, which is connected to the bottom of the cavity of the second part of the multi-start screw (5). The torque transmission structure (7) passes through the screw through hole. The screw through hole has a keyway, and the torque transmission structure (7) has a key bar. The keyway and the key bar cooperate to limit the freedom of relative rotation between the torque transmission structure (7) and the spiral motion structure (B).

6. The pyrotechnic rotary drive device according to any one of claims 1 to 5, characterized in that: The outer periphery of the spiral motion structure (B) has a thread; the inner cavity wall of the hollow shell structure (A) has a thread track that matches the thread of the spiral motion structure (B), so that the spiral motion structure (B) can move along a spiral track relative to the hollow shell structure (A).

7. The pyrotechnic rotary drive device according to claim 6, characterized in that: The hollow shell structure (A) comprises: A housing (8) having an actuating cavity; The outer periphery of the lead screw nut (6) cooperates with the wall of the actuating cavity of the housing (8) and limits the freedom of relative rotation and relative axial sliding of the lead screw nut (6) and the housing (8); the inner wall of the lead screw nut (6) cooperates with the outer peripheral thread of the spiral motion structure (B), so that the spiral motion structure (B) can move along a spiral trajectory relative to the lead screw nut (6) in the actuating cavity.

8. The pyrotechnic rotary drive device according to claim 7, characterized in that: The freedom of relative rotation between the lead screw nut (6) and the housing (8) is limited by a spline; A step is provided on the wall of the actuating cavity of the housing (8), and a side of the lead screw nut (6) facing away from the igniter (1) abuts against the step to limit the freedom of the lead screw nut (6) to move axially away from the igniter (1); The hollow shell structure (A) further comprises a charge body (2), which is located on a side of the shell (8) close to the igniter (1), and the charge body (2) is provided with a power chamber, the opening of which extends into the actuating chamber of the shell (8) and is fixedly connected by threads, the actuating chamber of the shell (8) is connected with the power chamber of the charge body (2) to form an inner chamber of the hollow shell structure (A), and the end face of the charge body (2) close to the shell (8) abuts against the lead screw nut (6) to limit the freedom of the lead screw nut (6) to move axially toward the igniter (1).

9. The pyrotechnic rotation drive device according to claim 8, characterized in that: The cooperation between the charge body (2) and the piston (4) satisfies at least one of the following conditions: The inner wall of the charge body (2) has a step to limit the axial position of the piston (4) in the initial state; When the piston (4) is at the maximum axial sliding stroke, the piston (4) is still engaged with the inner wall of the charge body (2) via the O-ring.

10. The pyrotechnic rotary drive device according to any one of claims 1 to 9, characterized in that: The hollow shell structure (A) has a limiting through hole at one end facing away from the igniter (1), the limiting through hole being connected to the bottom of the inner cavity of the hollow shell structure (A) and passing through the torque transmission structure (7); the torque transmission structure (7) has an annular boss, the annular boss is accommodated in the inner cavity of the hollow shell structure (A), the outer diameter of the annular boss is larger than the inner diameter of the limiting through hole, and the annular boss of the torque transmission structure (7) abuts against the bottom of the inner cavity of the hollow shell structure (A), thereby limiting the freedom of the torque transmission structure (7) to move axially toward the igniter (1); On the side of the limiting through hole of the hollow shell structure (A) away from the annular boss, the torque transmission structure (7) has an annular groove for mounting a shaft elastic retaining ring (11), the outer diameter of the elastic retaining ring (11) being larger than the inner diameter of the limiting through hole, thereby limiting the freedom of the torque transmission structure (7) to move axially away from the igniter (1) through the shaft elastic retaining ring (11).

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