阅读说明：本技术 一种可调式驱动结构 (Adjustable driving structure ) 是由 陈维宇 李小明 程亚威 高曼 雷恒 谢宁 李小龙 于 2020-11-17 设计创作，主要内容包括：本发明涉及一种驱动结构,特别涉及一种行程可调式驱动结构。本发明的目的是解决现有驱动结构存在适应范围窄,不具备行程可调和快速转级功能,难以适应不同速率条件下的转级要求的技术问题,提供一种可调式驱动结构。通过在壳体上设置调节螺母,调节螺母的轴向位置可在一定范围内进行调节,实现了活塞行程可调,进而实现了驱动行程可调；齿条与活塞采用分体式结构,并通过关节球轴承实现浮动式联结,使得齿条具有自动调整能力,并采用支撑组件对齿条另一端进行限位,采用调节螺钉对齿条进行轴向限位,避免了工作过程中因齿条运动导致的活塞运动故障,具备快速转级功能,可适应不同速率条件下的转级要求；为外置式,使用方便。(The present disclosure relates to driving mechanisms, and particularly to a stroke adjustable driving mechanism. The invention aims to solve the technical problems that the existing driving structure has a narrow application range, does not have the functions of stroke adjustability and rapid stage conversion and is difficult to adapt to the stage conversion requirements under the conditions of different speeds, and provides an adjustable driving structure. The adjusting nut is arranged on the shell, so that the axial position of the adjusting nut can be adjusted within a certain range, the stroke of the piston can be adjusted, and the driving stroke can be adjusted; the rack and the piston are in a split structure, floating connection is realized through a joint ball bearing, so that the rack has automatic adjustment capacity, the other end of the rack is limited by a support assembly, and the rack is limited axially by an adjusting screw, so that the piston movement fault caused by rack movement in the working process is avoided, the rack has a rapid gear shifting function, and the gear shifting requirement under different speed conditions can be met; is externally arranged and is convenient to use.)

1. An adjustable driving structure is characterized in that: the device comprises a shell (1), a nozzle (2) fixedly connected with the opening end of the shell (1), a piston (3), a first spring (4), an adjusting nut (5), a rack (6) and a gear shaft assembly (7) which are arranged in the shell (1), and a support assembly (8) and an adjusting screw (9) which are arranged on the shell (1) and extend into the shell (1);

the first spring (4) is sleeved on the piston (3), the piston (3) comprises a large end (31) and a small end (32), the end face of the large end (31) is opposite to the connector (2), the side face of the large end (31) and the side face of the small end (32) are in sealing contact with the inner wall of the shell (1), a cavity B is formed between the shell (1) and the piston (3), and the shell (1) is provided with an air inlet B communicated with the cavity B; an air inlet a leading into the shell (1) is formed in the nozzle (2), and a cavity A is formed between the nozzle (2), the end face of the large end (31) and the inner wall of the shell (1);

the adjusting nut (5) is arranged in the shell (1) through an external thread, a through hole is formed in the middle of the adjusting nut, the axial position of the adjusting nut is adjustable, and the adjusting nut is used for limiting the small end (32) of the piston (3);

one end of the rack (6) is connected with the small end (32) of the piston (3) through a joint ball bearing (10), and the other end of the rack (6) penetrates through a through hole in the adjusting nut (5) to be meshed with a gear shaft (75) of the gear shaft assembly (7);

the supporting component (8) is in contact with the other end of the rack (6) and is used for supporting and limiting the other end of the rack (6);

the end part of the adjusting screw (9) corresponds to the end part of the other end of the rack (6) and is used for axially limiting the rack (6).

2. The adjustable drive configuration according to claim 1, further comprising:

the supporting assembly (8) comprises a gland (81), a supporting seat (82), a roller (83) and a third spring (84);

the gland (81) is connected to the shell (1) through threads;

the supporting seat (82) is arranged on the gland (81);

the roller (83) is hinged on the supporting seat (82), and the top of the roller (83) presses the rack (6);

a first groove (811) is formed in the gland (81), a second groove (821) is formed in the supporting seat (82), and the first groove (811) is communicated with the second groove (821) to form a cavity C;

the third spring (84) is arranged in the cavity C, one end of the third spring (84) is contacted with the bottom of the first groove (811), and the other end of the third spring (84) is contacted with the bottom of the second groove (821).

3. The adjustable drive configuration according to claim 1, further comprising:

the gear shaft assembly (7) comprises a spring pre-tightening assembly (71), a switching sleeve (72) and two bearings (74);

the gear shaft (75) is arranged in the shell (1) through two bearings (74);

the surface of the middle section of the gear shaft (75) is provided with shaft teeth meshed with the rack (6);

one end of the gear shaft (75) is pressed by the spring pre-tightening component (71), the other end of the gear shaft (75) is fixedly connected with the adapter sleeve (72), the adapter sleeve (72) is butted with the input shaft of a load, and the butted surface of the load is jointed with the butted surface of the shell (1);

the gear shaft (75) is provided with a shaft shoulder (73), and the shaft shoulder (73) is matched with a limiting groove (11) formed in the shell (1) and used for limiting the gear shaft (75) to move towards one side of a load.

4. The adjustable drive configuration according to claim 3, further comprising: the spring pre-tightening assembly (71) comprises a second spring (711), a spring seat (712) and a sleeve (713) fixedly arranged in the shell (1), the second spring (711) is arranged in the sleeve (713), one end of the second spring (711) is in contact with the bottom of the sleeve (713), the other end of the second spring (711) is in contact with one side of the spring seat (712), and the other side of the spring seat (712) is tightly attached to the gear shaft (75).

5. The adjustable drive configuration according to claim 3 or 4, wherein: the limiting groove (11) is internally fixedly provided with a sealing ring (12), and the shaft shoulder (73) is attached to the end face of the sealing ring (12).

6. The adjustable drive configuration according to claim 5, further comprising: the load is a flow regulator.

7. The adjustable drive structure according to claim 1 or 6, wherein: the air inlet a and the air inlet b adopt the same pressure source.

8. The adjustable drive configuration according to claim 7, further comprising: the movement stroke H of the piston (3) is 10-25 mm.

9. The adjustable drive configuration of claim 8, wherein: and sealing rings are arranged at the contact parts of the side surface of the large end (31) and the side surface of the small end (32) of the piston (3) and the inner wall of the shell (1).

10. The adjustable drive configuration according to claim 1, further comprising: and a pressure measuring port c is also arranged on the connecting nozzle (2).

Technical Field

The present disclosure relates to driving mechanisms, and particularly to a stroke adjustable driving mechanism.

Background

The existing driving structure such as an air cylinder is usually fixed in stroke and is difficult to be applied to the occasions where the stroke needs to be adjusted, for example, a liquid rocket engine usually needs to adopt a flow regulator in the working process to realize the functional requirements of quick switching from small flow to large flow, flow regulation, flow stability and repeated use.

Disclosure of Invention

The invention aims to solve the technical problems that the existing driving structure has a narrow application range, does not have the functions of stroke adjustability and rapid stage conversion and is difficult to adapt to the stage conversion requirements under the conditions of different speeds, and provides an adjustable driving structure.

In order to solve the technical problems, the technical solution provided by the invention is as follows:

an adjustable driving structure is characterized in that: the device comprises a shell, a nozzle fixedly connected with the opening end of the shell, a piston, a first spring, an adjusting nut, a rack and gear shaft assembly arranged in the shell, and a supporting assembly and an adjusting screw which are arranged on the shell and extend into the shell;

the first spring is sleeved on the piston, the piston comprises a large end and a small end, the end face of the large end is opposite to the connecting nozzle, the side face of the large end and the side face of the small end are in sealing contact with the inner wall of the shell, a cavity B is formed between the shell and the piston, and the shell is provided with an air inlet B communicated with the cavity B; an air inlet a leading to the large end face is formed in the connecting nozzle, and a cavity A is formed among the connecting nozzle, the large end face and the inner wall of the shell;

the adjusting nut is arranged in the shell through an external thread, a through hole is formed in the middle of the adjusting nut, the axial position of the adjusting nut is adjustable, and the adjusting nut is used for limiting the small end of the piston;

one end of the rack is connected with the small end of the piston through a joint ball bearing, and the other end of the rack penetrates through a through hole in the adjusting nut to be meshed with a gear shaft of the gear shaft assembly;

the supporting component is in contact with the other end of the rack and is used for supporting and limiting the other end of the rack;

the end part of the adjusting screw corresponds to the end part of the other end of the rack and is used for axially limiting the rack.

Further, in order to ensure that the rack is meshed with the gear shaft, the supporting assembly comprises a gland, a supporting seat, a roller and a third spring;

the gland is connected to the shell through threads;

the supporting seat is arranged on the press cover;

the roller is hinged to the supporting seat, and the top of the roller compresses the rack;

a first groove is formed in the press cover, a second groove is formed in the supporting seat, and the first groove is communicated with the second groove to form a cavity C;

the third spring is arranged in the chamber C, one end of the third spring is in contact with the bottom of the first groove, and the other end of the third spring is in contact with the bottom of the second groove.

Furthermore, in order to ensure flexible movement of the gear shaft, the gear shaft assembly comprises a spring pre-tightening assembly, a switching sleeve and two bearings;

the gear shaft is arranged in the shell through two bearings;

the surface of the middle section of the gear shaft is provided with shaft teeth meshed with the rack;

one end of the gear shaft is pressed by the spring pre-tightening assembly, the other end of the gear shaft is fixedly connected with the adapter sleeve, the adapter sleeve is in butt joint with the input shaft of the load, and the butt joint surface of the load is attached to the butt joint surface of the shell;

the gear shaft is provided with a shaft shoulder which is matched with a limiting groove arranged in the shell and used for limiting the gear to move towards one side of the axial load.

Furthermore, in order to apply a certain pretightening force to the gear shaft, the spring pretightening assembly comprises a second spring, a spring seat and a sleeve fixedly arranged in the shell, the second spring is arranged in the sleeve, one end of the second spring is contacted with the bottom of the sleeve, the other end of the second spring is contacted with one side of the spring seat, and the other side of the spring seat is tightly attached to the gear shaft.

Further, in order to guarantee the leakproofness, the limiting groove internal fixation is provided with the sealing ring, the shaft shoulder is laminated with the terminal surface of sealing ring mutually.

Further, the load is a flow regulator.

Further, the air inlet a and the air inlet b adopt the same pressure source.

Furthermore, the movement stroke H of the piston is 10-25 mm.

Further, in order to ensure the sealing performance of the cavity A and the cavity B in the shell, sealing rings are arranged at the contact positions of the side surface of the large end and the side surface of the small end of the piston and the inner wall of the shell.

Further, in order to detect the pressure in the chamber a, a pressure measuring port c is further arranged on the nozzle.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the adjustable driving structure provided by the invention, the adjusting nut is arranged on the shell, the axial position of the adjusting nut can be adjusted within a certain range, the stroke of the piston is adjustable, and further the driving stroke is adjustable.

2. According to the adjustable driving structure provided by the invention, the rack and the piston are in a split structure, floating connection is realized through the joint ball bearing, so that the rack has automatic adjustment capacity, the rack is limited radially by the supporting assembly, the rack is limited axially by the adjusting screw, the piston movement fault caused by rack movement in the working process is avoided, the adjustable driving structure has a rapid gear shifting function, and the adjustable driving structure can meet the gear shifting requirement under the conditions of different speeds.

3. The adjustable driving structure provided by the invention is external and convenient to use.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along plane E-E of FIG. 1;

description of reference numerals:

1-shell, 2-connector, 3-piston, 31-big end, 32-small end, 4-first spring, 5-adjusting nut, 6-rack, 7-gear shaft component, 71-spring pre-tightening component, 711-second spring, 712-spring seat, 713-sleeve, 72-adapter sleeve, 73-shaft shoulder, 74-bearing, 75-gear shaft, 8-supporting component, 81-gland, 811-first groove, 82-supporting seat, 821-second groove, 83-roller, 84-third spring, 9-adjusting screw, 10-joint ball bearing, 11-limiting groove and 12-sealing ring.

Detailed Description

The invention is further described below with reference to the figures and examples.

An adjustable driving structure is shown in fig. 1, and mainly comprises a shell 1, a nozzle 2 fixedly connected with the opening end of the shell 1, a piston 3, a first spring 4, an adjusting nut 5, a rack 6 and a gear shaft assembly 7 which are arranged in the shell 1, and a supporting assembly 8 and an adjusting screw 9 which are arranged on the shell 1 and extend into the shell 1; the gear shaft assembly 7 is used for meeting the requirement of the drive load; the first spring 4 is sleeved on the piston 3 and used for providing a reset force for the piston 3, and the arrangement of the first spring 4 does not influence the guidance of the piston 3; the piston 3 comprises a large end 31 and a small end 32, the end face of the large end 31 is opposite to the nozzle 2, the side face of the large end 31 and the side face of the small end 32 are in sealing contact with the inner wall of the shell 1, a cavity B is formed between the shell 1 and the piston 3, and the shell 1 is provided with an air inlet B communicated with the cavity B; an air inlet a and a pressure measuring port which are communicated with the end surface of the large end 31 are arranged on the nozzle 2, and a cavity A is formed between the nozzle 2, the end surface of the large end 31 and the inner wall of the shell 1. In order to ensure the adjustable requirement of the stroke of the piston 3, on the premise of ensuring the structural strength, the adjusting nut 5 is arranged in the shell 1 through an external thread, a through hole is arranged in the middle, the axial position of the through hole is adjustable, and the through hole is used for limiting the small end 32 of the piston 3, so that the stroke of the piston 3 is axially limited; one end of the rack 6 is connected with the small end 32 of the piston 3 through the joint ball bearing 10 (namely, a floating connection structure is adopted), the other end of the rack 6 penetrates through a through hole in the adjusting nut 5 to be meshed with a gear shaft 75 of the gear shaft assembly 7, the movement of the piston 3 cannot be influenced by the connection mode, the rack 6 can move axially, the rack 6 drives the gear shaft 75 to rotate, and the supporting assembly is in contact with the other end of the rack 6 and used for supporting and limiting the other end of the rack 6; the end part of the adjusting screw 9 corresponds to the end part of the other end of the rack 6 and is used for axially limiting the rack 6.

According to the adjustable driving structure, under the combined action of medium pressure and the force of the first spring 4, the piston 3 can move left and right, the diameter D of the large end 31 of the piston 3 is larger than the diameter D1 of the small end 32, a cavity A is formed between the end surface of the large end 31 of the piston 3 and the inner wall of the shell 1 and the nozzle 2 in the process that the piston 3 moves towards one side of the adjusting nut 5, when the pressure of the cavity A is larger than a set pressure of 2MPa, the piston 3 can push the rack 6 fixedly connected with the piston 3 to drive the gear shaft 75 to rotate, and sufficient hydraulic driving force is generated by using the acting force generated by the area difference of the piston 3 to realize hydraulic driving; the piston 3 moves in the movement stroke range, and the piston 3 is limited by the adjusting nut 5 after moving to the leftmost end.

As shown in fig. 2, the gear shaft assembly 7 includes two bearings 74 of a spring pre-tightening assembly 71 and an adapter sleeve 72; in order to ensure the flexible movement of the gear shaft 75, the gear shaft 75 is installed in the housing 1 through two bearings 74; the middle surface of the gear shaft 75 is provided with shaft teeth meshed with the rack 6; in order to prevent the gear shaft 75 from moving, one end of the gear shaft 75 is pressed by the spring pre-tightening assembly 71, the other end of the gear shaft 75 is fixedly connected with the adapter sleeve 72, the adapter sleeve 72 is butted with an input shaft of a matched load, the butted surface of the load is jointed with the butted surface of the shell 1, and the rack 6 drives the gear shaft 75 and the adapter sleeve 72 fixedly connected on the gear shaft 75 to rotate together in the motion process of the piston 3; the gear shaft 75 is provided with a shaft shoulder 73, and the shaft shoulder 73 is matched with a limiting groove 11 formed in the housing 1 and used for limiting the gear shaft 75 to move towards one side of a load. The spring pre-tightening assembly 71 comprises a second spring 711, a spring seat 712 and a sleeve 713 fixedly arranged in the housing 1, the second spring 711 is arranged in the sleeve 713, one end of the second spring 711 contacts with the bottom of the sleeve 713, the other end of the second spring 711 contacts with one side of the spring seat 712, the other side of the spring seat 712 is tightly attached to the gear shaft 75, and a certain pre-tightening force applied by the second spring 711 is transmitted to the gear shaft 75 through the spring seat 712. The limiting groove 11 is internally and fixedly provided with a sealing ring 12, and the shaft shoulder 73 is attached to the end face of the sealing ring 12. The load is a flow regulator to realize the level-shifting function of the flow regulator.

The support assembly 8 comprises a gland 81, a support seat 82, a roller 83 and a third spring 84; the gland 81 is connected to the shell 1 through threads; the supporting seat 82 is arranged on the gland 81; the roller 83 is hinged on the supporting seat 82, and the top of the roller 83 presses the rack 6; a first groove 811 is formed in the pressing cover 81, a second groove 821 is formed in the supporting seat 82, and the first groove 811 is communicated with the second groove 821 to form a cavity C; the third spring 84 is disposed in the chamber C, one end of the third spring 84 contacts the bottom of the first recess 811, and the other end of the third spring 84 contacts the bottom of the second recess 821. The third spring 84 preloads the rack 6, eliminates the initial assembly gap between the support assembly 8 and the rack 6, and ensures that the rack 6 is meshed with the gear shaft 75, so that the support assembly 8 radially limits the rack 6. The gland 81 is connected to the housing 1 through a thread, so that the rack 6 can be finely adjusted in the radial direction, that is, a radial gap between the rack 6 and the gear shaft 75 is eliminated, and the flexible movement of the rack 6 is ensured.

The air inlet a and the air inlet b adopt the same pressure source. The motion stroke H of the piston 3 is 10-25 mm. In order to guarantee the leakproofness of piston 3 and casing 1 inner wall, all seted up the seal groove with the position department that the main aspects 31 side and the tip 32 side of piston 3 contacted respectively on the casing 1 inner wall, be equipped with the sealing washer in the seal groove, the setting of sealing washer can not influence the direction of piston 3.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.