CN217633198U - Output screw and swing cylinder - Google Patents

Abstract

The utility model relates to a hydro-cylinder technical field, concretely relates to output screw rod and swing jar. An output screw comprising a screw body having a first end and a second end, the first end having an outer diameter greater than the second end; the screw comprises a screw body and is characterized in that a plurality of screw holes and a plurality of oil ports are distributed on the outer end face of the first end of the screw body, the screw holes are circumferentially distributed, the oil ports are distributed on the inner periphery of the screw holes, the oil ports and the screw holes are circumferentially staggered, the oil ports are communicated with an internal oil duct, and the internal oil duct extends to the inner end face side of the first end. And taking the axis of the output screw as a center, wherein the maximum radial distance of the oil port deviating from the center is smaller than the minimum radial distance of the screw hole deviating from the center. The technical problems that an output screw in the prior art is complex to machine, long in machining time and strict in oil port position requirement are solved.

Description

Output screw and swing cylinder

Technical Field

The utility model relates to a hydro-cylinder technical field, concretely relates to output screw rod and swing jar.

Background

When the swing oil cylinder is used as an actuating element, a cylinder barrel is usually fixed with a frame, an end face of an output screw is fixed with a rotating component, and the output screw rotates under the action of oil pressure. Since the cylinder serves as a stationary member and the output screw serves as a moving member, friction is generated by relative rotation between the two. In order to reduce the friction force between the moving part and the static part, a needle bearing transmission is generally used between the moving part and the static part, and the needle bearing is a rolling friction form, has a small friction coefficient and meets the use requirement. In order to ensure the service life of the needle bearing, the needle bearing needs to be lubricated by grease, a grease nipple is usually required to be arranged, the grease nipple is a process hole and has the function of adding grease to the axial bearing in the swing oil cylinder, and the grease is filled in the oil cylinder before the oil cylinder leaves a factory.

As shown in fig. 1-2, in order to lubricate the needle bearing 1', the grease nipple 2' is arranged on the end surface of the output screw 3', and at the same time, the end surface of the output screw 3' is also provided with a screw hole 4', the screw hole 4' is used for connecting with the frame, and the position of the screw hole 4 'is required, and for the assembled swing cylinder, the screw hole 4' needs to be located at a zero position to facilitate the connection with the frame.

In order to ensure the requirement of the angle position of the end face screw hole, the processing technology in the prior art is to match the end face screw hole, and comprises the following specific steps:

1) Assembling by using an output screw with an unprocessed grease nipple and a screw hole on the end face;

2) Adjusting the angle position of the output screw according to the angle requirement of the screw hole, and marking at an angle zero position;

3) Disassembling an output screw, and processing a grease nipple and a screw hole by taking a line marked at the zero position of the angle as a reference;

4) Assembling a grease nipple and an output screw rod with a processed screw hole.

As can be seen from the above steps of the processing process, the processing of the output screw in the prior art mainly has the following disadvantages:

1. the processing is cumbersome. The output screw rod needs to be subjected to the processing processes of assembly, scribing, disassembly, processing and reassembly in sequence, and the scribed output screw rod is disassembled and processed after the output screw rod is installed, so that the processing time is wasted on disassembling and installing the swing oil cylinder; if the machining is carried out again at Huang Youkou after installation, machining waste can fall into the swing cylinder.

2. The position of the butter port is fixed. In the existing design, because the reference circle of the oil port is too large, if the oil port is randomly punched, the oil port is possibly communicated with the mounting screw hole, so that the position of the oil port is required to be between the two screw holes, and the position processing requirement is strict.

SUMMERY OF THE UTILITY MODEL

In order to solve the output screw processing among the prior art loaded down with trivial details, process time is long, the technical problem that the position requirement of hydraulic fluid port is strict, the utility model provides an output screw and swing jar has solved above-mentioned technical problem. The technical scheme of the utility model as follows:

an output screw comprising a screw body having a first end and a second end, the first end having an outer diameter greater than the second end; the screw comprises a screw body and is characterized in that screw holes and a plurality of oil ports are distributed on the outer end face of the first end of the screw body, the screw holes are circumferentially distributed, the oil ports are distributed on the inner periphery of the screw holes, the oil ports and the screw holes are circumferentially staggered, the oil ports are communicated with an internal oil duct, and the internal oil duct extends to the inner end face side of the first end.

The utility model provides an output screw rod through setting up the screw hole and the setting of staggering of hydraulic fluid port in circumference on the first end of screw rod body, then the hydraulic fluid port can not lead to the fact the interference to the screw hole, then the hydraulic fluid port can need not to set up between two screw holes, and the position requirement of hydraulic fluid port reduces. In addition, during processing, before assembly, an oil port and an internal oil duct are processed on the screw body, an output screw after the oil port and the internal oil duct are processed is assembled on the cylinder barrel, the angle position of the output screw is adjusted as required, and a line is drawn at the zero angle position; finally, screw holes are machined in the assembled swing cylinder. Compare in prior art's processing technology, the output screw rod of this application only needs the assembly once, has saved once and has disassembled and the assembly process, when also having avoided the dismouting, inside the processing waste material falls into the cylinder.

According to the utility model discloses an embodiment to the axis of output screw rod is the center, the biggest radial distance of hydraulic fluid port off-center is less than the minimum radial distance of screw hole off-center.

According to the utility model discloses an embodiment, inside oil duct includes first oil duct and second oil duct, the both ends of first oil duct communicate respectively the hydraulic fluid port with the second oil duct, the second oil duct perpendicular to first oil duct extends.

According to the utility model discloses an embodiment, first oil duct is on a parallel with the axis of screw body extends, the radial extension of second oil duct, the second oil duct arrives the minimum axial distance of the outer terminal surface of first end is greater than the axial depth of screw hole.

According to the utility model discloses an embodiment, the surface of screw rod body is formed with first screw thread, first screw thread is close to the second end sets up.

A swing cylinder, comprising:

the two ends of the cylinder barrel are respectively provided with a limiting piece;

the fixing nut is fixedly assembled in the cylinder barrel;

the hollow screw is in threaded fit with the fixing nut, a sliding part also extends from the outer surface of the hollow screw, and the sliding part is in sealed sliding fit with the inside of the cylinder barrel;

and the output screw is in threaded fit with the inner peripheral surface of the hollow screw, and two ends of the screw body respectively penetrate through the limiting piece and are in running fit with the limiting piece.

According to the utility model discloses an embodiment, be provided with first bearing between the interior terminal surface of the first end of screw rod body and the locating part that corresponds, the second end of screw rod body is connected with the end cover, be provided with the second bearing between end cover and the locating part that corresponds.

According to the utility model discloses an embodiment, be formed with first mounting groove on the interior terminal surface of the first end of screw rod body, first bearing assembly is in the first mounting groove, inside oil duct extend to with first mounting groove communicates with each other.

According to the utility model discloses an embodiment, with the first end complex of screw rod body be formed with the second mounting groove on the locating part, first bearing assembly is in the second mounting groove, inside oil duct extends to on the outer peripheral face of screw rod body near the first end inner end face.

According to the utility model discloses an embodiment, the internal surface of hollow screw is provided with the second screw thread, the surface of hollow screw is provided with the third screw thread, the second screw thread with the third screw thread is located same one end of hollow screw.

Based on the technical scheme, the utility model discloses the technological effect that can realize does:

1. the utility model discloses an output screw rod, through setting up the first epaxial screw hole of screw rod body and the setting of staggering in week, then the hydraulic fluid port can not cause the interference to the screw hole, then the hydraulic fluid port can need not to set up between two screw holes, and the position requirement of hydraulic fluid port reduces. In addition, during processing, before assembly, an oil port and an internal oil duct are processed on the screw body, an output screw after the oil port and the internal oil duct are processed is assembled on the cylinder barrel, the angle position of the output screw is adjusted as required, and a line is drawn at the zero angle position; finally, screw holes are machined in the assembled swing cylinder. Compared with the processing technology in the prior art, the output screw rod only needs to be assembled once, so that the disassembling and assembling processes are omitted once, and the processing waste material is prevented from falling into the cylinder barrel during disassembling and assembling;

2. the output screw of the utility model is limited to use the axis of the output screw as the center, the maximum radial distance of the oil port deviating from the center is smaller than the minimum radial distance of the screw hole deviating from the center, namely the oil port and the screw hole are completely staggered in the circumferential direction, and even if the oil port and the screw hole are positioned in the same radial direction, the interference can not be caused;

3. the output screw rod of the utility model is provided with the internal oil passage which comprises the first oil passage and the second oil passage which are vertically communicated, so that the path of the internal oil passage is lengthened, more lubricating oil can be injected into the internal oil passage, the lubricating time is long, and the number of times of injecting the lubricating oil can be reduced; the extension directions of the first oil channel and the second oil channel are further set, and the minimum axial distance from the second oil channel to the outer end face of the first end is greater than the axial depth of the screw hole, so that the screw hole cannot be overlapped and interfered with the internal oil channel;

4. the utility model discloses an output screw rod, surface are formed with first screw thread, and when processing first screw thread (first screw thread is the spiral external splines generally), the cutter needs the certain angle of slope, if first screw thread is too when being close to the first end of screw rod body, the handle of a knife of cutter is easy rather than interfering, so need design the less size of diameter with the cutter handle of a knife, nevertheless can lead to cutter rigidity and life-span not enough like this. If the position of the first thread is optimized to be far away from the first end of the screw body and close to the second end of the screw body, when the first thread is machined, the cutter handle does not interfere even if the cutter handle is designed to be large in diameter, so that the cutting speed and the service life of the cutter are improved;

5. the oscillating cylinder of the utility model adopts the output screw, the bearings are respectively arranged between the two ends of the output screw and the limiting pieces, and the first bearing can be assembled in the first mounting groove at the first end of the screw body for the assembly of the first bearing, and the internal oil duct is arranged to directly extend to be communicated with the first mounting groove, so that the lubricating oil entering through the oil port and the internal oil duct can directly enter the first mounting groove to lubricate the first bearing; in addition, the first bearing can be assembled in a second mounting groove on the limiting piece, at the moment, the internal oil duct is arranged to extend to the outer peripheral surface of the screw body close to the inner end surface of the first end, and lubricating oil entering through the oil port and the internal oil duct can enter the second mounting groove through a gap between the limiting piece and the inner end surface of the first end to lubricate the first bearing;

6. in the oscillating cylinder of the utility model, the second thread and the third thread on the hollow screw are positioned at the same end of the hollow screw, and the processing of the internal and external spiral spline can be realized by one-time clamping; compare second screw thread and third screw thread in prior art and be located the both ends of hollow screw, need twice clamping: firstly, clamping an excircle at one end, and processing an internal spiral spline; turning around, clamping the excircle at the other end, and processing an external spiral spline; the hollow screw rod machining efficiency of this application is high.

Drawings

FIG. 1 is a schematic structural diagram of a swing cylinder in the prior art;

FIG. 2 is a schematic end view of a prior art output screw;

fig. 3 is a cross-sectional view of an output screw according to a first embodiment of the present invention;

FIG. 4 is a schematic view of an outer end face of a first end of the output screw;

FIG. 5 is a sectional view of the swing cylinder according to the first embodiment;

FIG. 6 is a partial schematic view of the inner end surface of the first end of the output screw with the first bearing mounted thereon;

fig. 7 is a sectional view of an output screw according to a second embodiment of the present invention;

FIG. 8 is a sectional view of the swing cylinder of the second embodiment;

FIG. 9 is a schematic view of a partial structure of a first bearing mounted on a stop cooperating with a first end of an output screw;

in the figure: 1-screw body; 11-a first end; 111-screw holes; 112-oil port; 113-internal oil gallery; 1131 — a first oil gallery; 1132 — a second oil gallery; 114-a first mounting slot; 12-a second end; 13-a first thread; 2-a cylinder barrel; 3-a limiting part; 31-a second mounting groove; 4-fixing the nut; 41-fourth thread; 5-a hollow screw; 51-a sliding part; 52-second thread; 53-third thread; 61-a first bearing; 62-a second bearing; 7-end cap; 8-a gasket; 1' -needle roller bearing; 2' -grease nipple; 3' -an output screw; 4' -screw holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

Example one

As shown in fig. 3 to 6, the present embodiment provides an output screw, which includes a screw body 1, the screw body 1 has a first end 11 and a second end 12, the outer diameter of the first end 11 is larger than that of the second end 12, and since the output screw is used for the swing cylinder and the output screw needs to rotate relative to the cylinder 2, both the first end 11 and the second end 12 of the screw body 1 need to be rotatably assembled.

For the first end 11 of the screw body 1, the inner end face of the first end 11 of the screw body 1 is used for being rotatably assembled with the cylinder barrel 2, screw holes 111 and oil ports 112 are formed in the outer end face of the first end 11 of the screw body 1, the screw holes 111 are distributed in the circumferential direction, and the screw holes 111 are distributed in the circumferential direction; the oil port 112 is a plurality of, and a plurality of oil port 112 circumference is arranged, and screw hole 111 and oil port 112 stagger the setting in circumference.

As a preferred technical solution of this embodiment, there are at least two screw holes 111, and at least two screw holes 111 are uniformly arranged along the first circumferential direction; at least two oil ports 112 are provided, and the at least two oil ports 112 are uniformly arranged along the second circumferential direction. The maximum radial distance of the oil port 112 deviating from the center is smaller than the minimum radial distance of the screw hole 111 deviating from the center by taking the axis of the output screw as the center, so that the oil port 112 and the screw hole 111 can be completely staggered, and even if the oil port 112 and the screw hole 111 are positioned in the same radial direction, interference cannot be caused. In this embodiment, the number of screw holes 111 is 8, and the number of oil ports 112 is 2.

An internal oil passage 113 is formed in the first end 11 of the screw body 1, the internal oil passage 113 is provided for the oil port 112, and the oil port 112 communicates with the inner end face side of the first end 11 of the screw body 1 through the internal oil passage 113. Specifically, the internal oil passage 113 includes a first oil passage 1131 and a second oil passage 1132, both ends of the first oil passage 1131 communicate with the oil port 112 and the second oil passage 1132, respectively, and the second oil passage 1132 extends to the inner end face side of the first end 11 of the screw body 1.

As a preferable aspect of the present embodiment, the first oil passage 1131 and the second oil passage 1132 are perpendicular to each other, and specifically, the first oil passage 1131 may be provided to extend parallel to the axis of the screw body 1, and the second oil passage 1132 may be provided to extend radially perpendicular to the first oil passage 1131. Preferably, the axial depth of the first oil passage 1131 is greater than the axial depth of the screw holes 111; the minimum axial distance of second oil passage 1132 to the outer end face of first end 11 is greater than the axial depth of screw hole 111.

As a preferred technical solution of this embodiment, in order to facilitate assembly of the bearing structure, in this embodiment, a first mounting groove 114 is formed on an inner end surface of the first end 11 of the screw body 1, the first mounting groove 114 is annular, the second oil passage 1132 may radially extend to an inner circumferential surface of the first mounting groove 114, the second oil passage 1132 is communicated with the first mounting groove 114, and lubricating oil may enter the first mounting groove 114 through the oil port 112 and the internal oil passage 113 to lubricate the bearing structure in the first mounting groove 114.

The screw body 1 is also formed with a first thread 13 on its outer peripheral surface, the first thread 13 being located between the first end 11 and the second end 12. The first thread 13 is provided in this embodiment adjacent the first end 11.

The embodiment also provides a swing cylinder, including foretell output screw, still include cylinder 2, fixation nut 4 and hollow screw 5, fixation nut 4 is fixed to be assembled in the inside of cylinder 2, and hollow screw 5 and fixation nut 4 screw-thread fit, output screw stretch to in the hollow screw 5, with hollow screw 5 screw-thread fit.

The cylinder barrel 2 is hollow, the two ends of the cylinder barrel 2 are hermetically assembled with the limiting pieces 3, and the two ends of the output screw respectively penetrate through the limiting pieces 3 and are in running fit with the corresponding limiting pieces 3. A first bearing 61 is arranged between the inner end surface of the first end 11 of the screw body 1 and the corresponding limiting part 3, an end cover 7 is assembled on the second end 12 of the screw body 1, and a second bearing 62 is arranged between the inner end surface of the end cover 7 and the corresponding limiting part 3. Specifically, the first bearing 61 is accommodated in the first mounting groove 114, and the spacers 8 are provided on both sides in the axial direction of the first bearing 61; an inner end surface of the end cover 7 facing the limiting member 3 is formed with a mounting groove, the second bearing 62 is accommodated in the mounting groove of the end cover 7, and the two sides of the second bearing 62 in the axial direction are also provided with a gasket 8. Both the first bearing 61 and the second bearing 62 may be selected from, but not limited to, ball bearings.

The hollow screw 5 is hollow, a second thread 52 is formed on the inner circumferential surface of the hollow screw 5, a third thread 53 is formed on the outer circumferential surface of the hollow screw 5, and the hollow screw 5 is in threaded fit with the output screw through the second thread 52; the hollow screw 5 is screw-engaged with the fixing nut 4 through a third screw 53. In this embodiment, the second thread 52 and the third thread 53 are located at both ends of the hollow screw 5.

The outer peripheral surface of the hollow screw 5 is further extended with a sliding part 51, the sliding part 51 and the third thread 53 are respectively positioned at two ends of the hollow screw 5, and the sliding part 51 is in sealing sliding fit with the inner surface of the cylinder 2.

The fixing nut 4 is fixed to the inner surface of the cylinder 2, the fixing nut 4 has a fourth thread 41 formed on the inner peripheral surface thereof, and the fixing nut 4 is screw-engaged with the hollow screw 5 through the fourth thread 41.

The output screw and the swing cylinder of this embodiment, screw hole 11 and hydraulic fluid port 12 stagger completely in circumference, then make things convenient for the processing of screw hole 11 and hydraulic fluid port 12, and hydraulic fluid port 12 of processing earlier can not form the screw hole 11 of postprocessing and interfere, can assemble output screw to cylinder 2 back, and the whole dress processing screw hole 11 has saved manufacturing procedure, and can not cause the pollution to swing the cylinder inside. The arrangement of the internal oil passage 13 does not interfere the screw hole 11, the length of the oil passage in the first end 11 is increased, more lubricating oil can be stored, the lubricating time is long, and the number of times of filling the lubricating oil can be effectively reduced.

Example two

As shown in fig. 7 to 9, the present embodiment is substantially the same as the first embodiment, and has two differences, where the first difference is that the first bearing 61 and the second bearing 62 are installed at different positions. In this embodiment, a first mounting groove is not provided on the first end 11 of the screw body 1, and a mounting groove is not required to be provided on the end cover 7, but a second mounting groove 31 is formed on the outer end surfaces of the two limiting members 3, and the first bearing 61 and the second bearing 62 are respectively assembled in the second mounting grooves 31 of the two limiting members 3. Meanwhile, the second oil passage 1132 of the internal oil passage 13 extends to the outer peripheral surface of the screw body 1 close to the inner end surface of the first end 11, and because there is a gap between the inner end surface of the first end 11 and the corresponding limiting member 3, the lubricating oil flowing in through the internal oil passage 113 enters the gap between the inner end surface of the first end and the corresponding limiting member 3, and then flows into the second mounting groove 31 to lubricate the first bearing 61.

The second difference is that the first thread 13 is located at a different position than the first embodiment, in which the first thread 13 is located between the first end 11 and the second end 12, but the first thread 13 is located near the second end 12. Correspondingly, the second thread 52 and the third thread 53 on the hollow screw 5 are provided at the same end of the hollow screw 5, and the sliding part 51 is located at the other end of the hollow screw 5. In this way, the machining tool does not interfere with the first end 11 when machining the first thread 13 on the output screw; when the hollow screw 5 is processed, the hollow screw 5 can be clamped once, and the second thread 52 and the third thread 53 can be processed.

The first and second distinguishing points may be incorporated into the structure of the first embodiment alone or together.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. An output screw, characterized by comprising a screw body (1), the screw body (1) having a first end (11) and a second end (12), the first end (11) having an outer diameter greater than the outer diameter of the second end (12); the outer end face of a first end (11) of the screw body (1) is provided with a screw hole (111) and oil ports (112), the screw hole (111) is a plurality of, the screw hole (111) is circumferentially arranged, the oil ports (112) are distributed on the inner periphery of the screw hole (111), the oil ports (112) and the screw hole (111) are circumferentially staggered, the oil ports (112) are communicated with an internal oil duct (113), and the internal oil duct (113) extends to the inner end face side of the first end (11).

2. An output screw according to claim 1, characterised in that the maximum radial distance of the oil port (112) from the centre, centred on the axis of the output screw, is smaller than the minimum radial distance of the screw hole (111) from the centre.

3. The output screw of any one of claims 1-2, wherein the internal oil channel (113) comprises a first oil channel (1131) and a second oil channel (1132), the two ends of the first oil channel (1131) are respectively communicated with the oil port (112) and the second oil channel (1132), and the second oil channel (1132) extends perpendicular to the first oil channel (1131).

4. An output screw according to claim 3, characterised in that the first oil channel (1131) extends parallel to the axis of the screw body (1), the second oil channel (1132) extends radially, and the minimum axial distance of the second oil channel (1132) to the outer end face of the first end (11) is greater than the axial depth of the screw hole (111).

5. An output screw according to claim 1, characterised in that the outer surface of the screw body (1) is formed with a first thread (13), the first thread (13) being arranged close to the second end (12).

6. A swing cylinder, comprising:

the cylinder barrel (2), both ends of the cylinder barrel (2) are respectively equipped with a limiting piece (3);

the fixing nut (4), the said fixing nut (4) is fitted in the said cylinder (2) fixedly;

the hollow screw (5) is in threaded fit with the fixing nut (4), a sliding part (51) also extends from the outer surface of the hollow screw (5), and the sliding part (51) is in sealed sliding fit with the inside of the cylinder barrel (2);

the output screw according to any one of claims 1 to 5, wherein the output screw is in threaded engagement with the inner peripheral surface of the hollow screw (5), and both ends of the screw body (1) respectively penetrate through the limiting piece (3) and are in rotational engagement with the limiting piece (3).

7. Oscillating cylinder according to claim 6, characterized in that a first bearing (61) is arranged between the inner end face of the first end (11) of the screw body (1) and the corresponding stop (3), that an end cap (7) is connected to the second end (12) of the screw body (1), and that a second bearing (62) is arranged between the end cap (7) and the corresponding stop (3).

8. An oscillating cylinder according to claim 7, characterised in that the inner end surface of the first end (11) of the screw body (1) is formed with a first mounting groove (114), the first bearing (61) is fitted in the first mounting groove (114), and the internal oil passage (113) extends to communicate with the first mounting groove (114).

9. Swing cylinder according to claim 7, characterized in that the retainer (3) cooperating with the first end (11) of the screw body (1) is formed with a second mounting groove (31), the first bearing (61) is fitted in the second mounting groove (31), and the internal oil passage (113) extends to the outer peripheral surface of the screw body (1) near the inner end surface of the first end (11).

10. An oscillating cylinder according to any one of claims 6-9, characterised in that the inner surface of the hollow screw (5) is provided with a second thread (52), and the outer surface of the hollow screw (5) is provided with a third thread (53), the second thread (52) and the third thread (53) being located at the same end of the hollow screw (5).

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