CN111173802A - Double-helix swing hydraulic cylinder - Google Patents
Double-helix swing hydraulic cylinder Download PDFInfo
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- CN111173802A CN111173802A CN202010114959.3A CN202010114959A CN111173802A CN 111173802 A CN111173802 A CN 111173802A CN 202010114959 A CN202010114959 A CN 202010114959A CN 111173802 A CN111173802 A CN 111173802A
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- channel
- wall surface
- rotating shaft
- piston
- hydraulic cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/04—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member with oscillating cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention discloses a double-helix swing hydraulic cylinder, which comprises: a cylinder body having a passage defined therein; an output shaft, at least a part of the outer wall surface and the inner wall surface of the channel are distributed at intervals; an end cap; the piston is positioned in the channel and divides the channel into a first chamber and a second chamber which are mutually separated, the piston is sleeved on the periphery of the output rotating shaft and can reciprocate under the action of pressure oil, and at least one part of the inner wall surface of the piston and the outer wall surface of the output rotating shaft form a first screw pair; and one part of the fixing piece is connected with the inner wall surface of the channel, a second screw pair is formed between the other part of the fixing piece and the outer wall surface of the piston, the second screw pair and the first screw pair are mutually matched to convert the axial movement of the piston into the circumferential rotation of the output rotating shaft, and at least one part of the first screw pair and the second screw pair are distributed in a staggered manner along the axial direction of the channel. The double-helix swing hydraulic cylinder can convert the linear motion of the piston into the rotary motion of the output rotating shaft by utilizing a large helix angle.
Description
Technical Field
The invention belongs to the technical field of hydraulic cylinders, and particularly relates to a double-helix swing hydraulic cylinder.
Background
In order to realize the rotary motion of a certain part under the heavy load condition on the large-scale engineering machinery produced in China at present, a rack-and-pinion type or blade type swing hydraulic cylinder is mostly adopted.
The vane type swing hydraulic cylinder has the advantages of simple structure, convenient processing, stable torque output and the like. However, the sealing of the moving part is easy to generate internal leakage, so that the volumetric efficiency and the use pressure are difficult to further improve, and the output torque cannot be too large directly. In addition, due to the structural problem of the output rotor, the output rotation angle cannot be more than 360 degrees.
The gear-rack type swing hydraulic cylinder has the advantages of simple structure, easiness in sealing, easiness in controlling and maintaining position precision, capability of enabling an output rotating angle to exceed 360 degrees and the like. But the volume is large, and the device cannot be installed on some devices with compact structures. The gear-rack type or blade type swing hydraulic cylinder generally has the defects of large volume, slow response, short service life, low precision, small rotation angle and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides the double-helix swing hydraulic cylinder which can convert hydraulic thrust into output torque and has the advantages of small volume, light weight, compact structure and the like.
According to the embodiment of the invention, the double-helix swinging hydraulic cylinder comprises: a cylinder body defining a channel extending axially therein; at least one part of the output rotating shaft is arranged in the channel and extends along the axial direction of the channel, and at least one part of the outer wall surface of the output rotating shaft is distributed at intervals with the inner wall surface of the channel; the end cover is arranged at one end of the channel and is connected with the output rotating shaft; the piston is positioned in the channel and divides the channel into a first cavity and a second cavity which are mutually separated, the cylinder body is provided with a first oil conveying hole communicated with the first cavity and a second oil conveying hole communicated with the second cavity, the piston is sleeved on the periphery of the output rotating shaft and can reciprocate along the axial direction of the channel under the action of pressure oil in the first cavity and the second cavity, at least one part of the inner wall surface of the piston and the outer wall surface of the output rotating shaft form a first screw pair, and at least one part of the outer wall surface of the piston and the inner wall surface of the channel are distributed at intervals; the fixing piece is arranged in the channel and is located between the outer wall surface of the piston and the inner wall surface of the channel in the radial direction of the channel, one part of the fixing piece is connected with the inner wall surface of the channel, a second screw pair opposite to the rotating direction of the first screw pair is formed between the other part of the fixing piece and the outer wall surface of the piston, the second screw pair and the first screw pair are matched with each other to convert the axial movement of the piston into the circumferential rotation of the output rotating shaft, and at least one part of the first screw pair and the second screw pair are distributed in a staggered mode in the axial direction of the channel.
According to the double-helix swing hydraulic cylinder disclosed by the embodiment of the invention, the cylinder body, the output rotating shaft, the end cover, the piston and the fixing piece are combined, and the linear motion of the piston can be converted into the rotary motion of the output rotating shaft by utilizing a large helix angle.
According to an embodiment of the present invention, a radial dimension of one end of the output rotating shaft is larger than a radial dimension of the other end of the output rotating shaft, the other end of the output rotating shaft extends into the channel and extends toward the end cover, and the double-helix swing hydraulic cylinder further includes: the first limiting piece is arranged in the channel and positioned between one end of the output rotating shaft and the first oil delivery hole; the second limiting part is arranged in the channel and positioned between the fixing part and the end cover, and the second limiting part is matched with the first limiting part to limit the axial displacement of the output rotating shaft.
According to one embodiment of the invention, a first counter bore extending along the circumferential direction of the inner surface of the channel is arranged in the channel, and the first limiting member is arranged in the first counter bore and fixedly connected with the cylinder body.
According to an embodiment of the present invention, the double helix swing hydraulic cylinder further comprises: the first plane thrust needle roller bearing is arranged between the first limiting piece and one end of the output rotating shaft.
According to one embodiment of the present invention, the output shaft includes, in an axial direction of the passage: the first section body is arranged on one side of the channel, the radial size of the first section body is larger than that of the channel, and the first section body is connected with the cylinder body; the second section body is arranged in the channel, one end of the second section body is connected with the first section body, the other end of the second section body is provided with step parts which are distributed along the axial direction of the channel, and the first plane thrust needle roller bearing is arranged on the step parts; the third section body is arranged in the channel, one end of the third section body is connected with the other end of the second section body, the radial size of the third section body is smaller than that of the second section body, and the first limiting piece is arranged between the third section body and the inner wall surface of the channel.
According to one embodiment of the invention, the thread on the output rotating shaft corresponding to the first screw pair is spaced from the third segment body.
According to one embodiment of the invention, a second counter bore extending along the circumferential direction of the inner surface of the channel is arranged in the channel, and the second limiting member is arranged in the second counter bore and fixedly connected with the cylinder body.
According to an embodiment of the present invention, the double helix swing hydraulic cylinder further comprises: and the second plane thrust needle bearing is arranged between the second limiting piece and the end cover.
According to one embodiment of the invention, the output shaft is formed as a hollow member.
According to one embodiment of the invention, the fixing member is welded to the cylinder block.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a double-helix swing hydraulic cylinder according to an embodiment of the invention.
Reference numerals:
a double-helix swing hydraulic cylinder 100;
a cylinder body 10; a channel 11; a first chamber 12; a second chamber 13; a first oil delivery hole 14; a second oil delivery hole 15; a first counterbore 16; a second counterbore 17;
an output rotary shaft 20; a first segment body 21; a second segment 22; a step portion 23; a third segment 24;
an end cap 30;
a piston 40; a first screw pair 41;
a fixing member 50; a second screw pair 51;
a first stopper 60;
a second stopper 70;
a first planar thrust needle bearing 80;
a second planar thrust needle bearing 90.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The double spiral swing cylinder 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a double-helix swing hydraulic cylinder 100 according to an embodiment of the present invention includes: cylinder 10, output shaft 20, end cap 30, piston 40 and fixing member 50.
Specifically, a channel 11 extending along an axial direction of the cylinder 10 is defined in the cylinder 10, at least a portion of the output rotating shaft 20 is disposed in the channel 11 and extends along the axial direction of the channel 11, at least a portion of an outer wall surface of the output rotating shaft 20 is distributed at a distance from an inner wall surface of the channel 11, an end cap 30 is disposed at one end of the channel 11 and is connected to the output rotating shaft 20, a piston 40 is disposed in the channel 11 and divides the channel 11 into a first chamber 12 and a second chamber 13 spaced from each other, the cylinder 10 is provided with a first oil feed hole 14 communicating with the first chamber 12 and a second oil feed hole 15 communicating with the second chamber 13, the piston 40 is sleeved on an outer periphery of the output rotating shaft 20 and can reciprocate along the axial direction of the channel 11 under the action of pressure oil in the first chamber 12 and the second chamber 13, at least a portion of an inner wall surface of the piston 40 and the outer wall surface of the output rotating shaft 20 form a first screw pair 41, at least a portion of the outer wall surface, the fixing element 50 is arranged in the channel 11 and located between the outer wall surface of the piston 40 and the inner wall surface of the channel 11 in the radial direction of the channel 11, a part of the fixing element 50 is connected with the inner wall surface of the channel 11, a second screw pair 51 opposite to the rotation direction of the first screw pair 41 is formed between the other part of the fixing element 50 and the outer wall surface of the piston 40, the second screw pair 51 is matched with the first screw pair 41 to convert the axial movement of the piston 40 into the axial rotation of the output rotating shaft 20, and at least one part of the first screw pair 41 and the second screw pair 51 are distributed in a staggered mode along the axial direction of the channel 11.
In other words, the double-helix swing hydraulic cylinder 100 according to the embodiment of the invention mainly comprises a cylinder body 10, an output rotating shaft 20, an end cover 30, a piston 40 and a fixing piece 50, wherein a channel 11 extending along the axial direction of the cylinder body 10 is defined in the cylinder body 10, the piston 40 and the fixing piece 50 are installed in the channel 11, the piston 40 is provided with an installation hole extending along the axial direction of the piston, a part of the output rotating shaft 20 extends into the channel 11 and passes through the installation hole of the piston 40, and a first screw pair 41 is formed between at least a part of the outer wall surface of the output rotating shaft 20 and at least a part of the inner wall surface of the piston 40 in. Specifically, the first screw pair 41 may be formed by engaging female screw splines on the piston 40 with male screw splines on the output rotary shaft 20. The fixed member 50 is connected to the cylinder 10, and a second screw pair 51 is formed between the fixed member 50 and the piston 40. Specifically, the second screw pair 51 may be formed by the engagement of male screw splines on the piston 40 and female screw splines on the fixing member 50.
The second screw pair 51 cooperates with the first screw pair 41 to convert axial movement of the piston 40 into circumferential rotation of the output rotary shaft 20. Specifically, the pressure oil is supplied into the first chamber 12 through the first oil supply hole 14, the piston 40 is axially moved rightward by the pressure in the first chamber 12, the screw transmission is performed between the outer wall surface of the piston 40 and the inner wall of the stator 50, and the piston 40 is circumferentially rotated while being axially moved. Since the second screw pair 51 is rotated in the opposite direction to the first screw pair 41, the output rotation angle can be a vector of the rotation angles of the two-step screw pairs. The inner wall of the piston 40 and the outer wall of the output rotating shaft 20 are in screw transmission, and the output rotating shaft 20 can rotate in the circumferential direction, so that the axial movement of the piston 40 can be converted into the axial rotation of the output rotating shaft 20. At least one part of the first screw pair 41 and the second screw pair 51 are distributed in a staggered manner along the axial direction of the channel 11, and by adopting a staggered arrangement structure, not only can the two screw pairs be more stable in the mutual meshing process, but also the coaxiality of the fixing piece 50, the piston 40 and the output rotating shaft 20 can be higher.
Thus, the double-helix swing hydraulic cylinder 100 according to the embodiment of the present invention can convert the linear motion of the piston 40 into the rotational motion of the output rotating shaft 20 using a large helix angle by combining the cylinder body 10, the output rotating shaft 20, the end cap 30, the piston 40, and the fixing member 50.
According to an embodiment of the present invention, a radial dimension of one end of the output rotating shaft 20 is larger than a radial dimension of the other end of the output rotating shaft 20, the other end of the output rotating shaft 20 extends into the channel 11 and extends toward the end cover 30, and the double-helix swing hydraulic cylinder 100 further includes: the first limiting member 60 is disposed in the channel 11 and located between one end of the output rotating shaft 20 and the first oil delivery hole 14, the second limiting member 70 is disposed in the channel 11 and located between the fixing member 50 and the end cover 30, and the second limiting member 70 cooperates with the first limiting member 60 to limit the displacement of the output rotating shaft 20 along the axial direction thereof, that is, the output rotating shaft 20 can only rotate without translating in the axial direction by the cooperation of the first limiting member 60 and the second limiting member 70. The axial movement of the output rotating shaft 20 is limited by the first limiting member 60 and the second limiting member 70, the output rotating shaft 20 can only make opposite rotational movements under the action of the first screw pair 41, and the rotation angle is the vector superposition of the rotation angles of the first screw pair 41 and the second screw pair 51.
Alternatively, the positioning of the first and second position-limiting members 60 and 70 may be realized by a stepped hole of the inner bore of the cylinder block 10.
Further, a first counter bore 16 extending along the circumferential direction of the inner surface of the channel 11 is formed in the channel 11, the first limiting member 60 is disposed in the first counter bore 16 and is fixedly connected to the cylinder 10, and the axial movement of the output rotating shaft 20 can be limited by mounting the first limiting member 60 in the first counter bore 16. The first limiting member 60 can be fixedly connected to the cylinder 10 by a set screw, so that the first limiting member 60 can be effectively prevented from rotating.
In some embodiments of the present invention, the double-helix swing hydraulic cylinder 100 further includes a first planar needle thrust bearing 80, and the first planar needle thrust bearing 80 is disposed between the first limiting member 60 and one end of the output rotating shaft 20 to facilitate circumferential rotation of the output rotating shaft 20.
Optionally, the output shaft 20 includes, in the axial direction of the passage 11: a first segment 21, a second segment 22 and a third segment 24.
Specifically, the first segment 21 is disposed on one side of the channel 11 and has a radial dimension larger than that of the channel 11, the first segment 21 is connected to the cylinder 10, and an outer edge of the first segment 21 may cover the channel 11 and may close an end of the channel 11. The second segment 22 is disposed in the channel 11, one end of the second segment 22 is connected to the first segment 21, the other end of the second segment 22 is provided with a step 23 distributed along the axial direction of the channel 11, the first planar thrust needle bearing 80 is disposed on the step 23, when the output shaft 20 and the end cap 30 rotate, relative rotation can be generated between the output shaft 20 and the end cap 30 and between the first limiting member 60 and the second limiting member 70, and a bearing is added between the two to reduce friction. The third segment 24 is disposed in the channel 11, one end of the third segment 24 is connected to the other end of the second segment 22, and the radial dimension of the third segment is smaller than that of the second segment 22, and a first limiting member 60 is disposed between the third segment 24 and the inner wall surface of the channel 11, so as to facilitate the installation of the first limiting member 60 and the limiting of the output rotating shaft 20.
Further, the threads corresponding to the first screw pair 41 on the output rotating shaft 20 are spaced from the third segment 24, so that the machining requirement can be met, and the thread machining tool withdrawal groove is convenient.
According to an embodiment of the present invention, a second counterbore 17 extending along the circumferential direction of the inner surface of the channel 11 is provided in the channel 11, and the second limiting member 70 is provided in the second counterbore 17 and fixedly connected to the cylinder body 10, so that the installation of the second limiting member 70 is facilitated, and the installation firmness and stability of the second limiting member 70 are improved. The second limiting member 70 may also be fixedly connected to the cylinder 10 by a set screw.
Further, the double-helix swing hydraulic cylinder 100 further includes a second planar thrust needle bearing 90, and the second planar thrust needle bearing 90 is disposed between the second limiting member 70 and the end cover 30, so that the end cover 30 and the output rotating shaft 20 can rotate synchronously.
Alternatively, the output shaft 20 and the end cap 30 may be screwed and secured by a set screw to prevent relative rotation.
In some embodiments of the present invention, the output shaft 20 is formed as a hollow member.
According to an embodiment of the present invention, the fixing member 50 is welded to the cylinder block 10.
According to an embodiment of the present invention, sealing members are respectively disposed between the output rotating shaft 20 and the cylinder 10, between the output rotating shaft 20 and the piston 40, between the first limiting member 60 and the output rotating shaft 20, and between the second limiting member 70 and the output rotating shaft 20. Specifically, a sealing ring for a hole is provided between the piston 40 and the inner hole of the cylinder 10, a sealing ring for a rod is provided between the piston 40 and the output rotary shaft 20, a sealing ring for a rod is provided between the first stopper 60 and the output rotary shaft 20, and a sealing ring for a rod is provided between the second stopper 70 and the output rotary shaft 20. Through the above sealing, independent closed spaces at both sides of the first chamber 12 and the second chamber 13 can be formed.
In summary, the double-helix swing hydraulic cylinder 100 according to the embodiment of the present invention adopts the combination of the cylinder body 10, the output rotating shaft 20, the end cover 30, the piston 40 and the fixing member 50, and can convert the linear motion of the piston 40 into the rotational motion of the output rotating shaft 20 by using a large helix angle, and the double-helix swing hydraulic cylinder 100 can convert the hydraulic thrust into the output torque, and not only has small volume, light weight and compact structure, but also can realize the rotation of any angle when the cylinder stroke is long, and has the advantages of good sealing performance, high volumetric efficiency and the like by adopting a rotary sealing structure. The double-helix swing hydraulic cylinder 100 according to the embodiment of the invention can be widely applied to indexing mechanisms, indexing devices, manipulators, various metallurgical equipment, petrochemical equipment, mining equipment and the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A double helix pendulum hydraulic cylinder, comprising:
a cylinder body defining a channel extending axially therein;
at least one part of the output rotating shaft is arranged in the channel and extends along the axial direction of the channel, and at least one part of the outer wall surface of the output rotating shaft is distributed at intervals with the inner wall surface of the channel;
the end cover is arranged at one end of the channel and is connected with the output rotating shaft;
the piston is positioned in the channel and divides the channel into a first cavity and a second cavity which are mutually separated, the cylinder body is provided with a first oil conveying hole communicated with the first cavity and a second oil conveying hole communicated with the second cavity, the piston is sleeved on the periphery of the output rotating shaft and can reciprocate along the axial direction of the channel under the action of pressure oil in the first cavity and the second cavity, at least one part of the inner wall surface of the piston and the outer wall surface of the output rotating shaft form a first screw pair, and at least one part of the outer wall surface of the piston and the inner wall surface of the channel are distributed at intervals;
the fixing piece is arranged in the channel and is located between the outer wall surface of the piston and the inner wall surface of the channel in the radial direction of the channel, one part of the fixing piece is connected with the inner wall surface of the channel, a second screw pair opposite to the rotating direction of the first screw pair is formed between the other part of the fixing piece and the outer wall surface of the piston, the second screw pair and the first screw pair are matched with each other to convert the axial movement of the piston into the circumferential rotation of the output rotating shaft, and at least one part of the first screw pair and the second screw pair are distributed in a staggered mode in the axial direction of the channel.
2. The double helix pendulum hydraulic cylinder of claim 1, wherein a radial dimension of one end of the output shaft is greater than a radial dimension of the other end of the output shaft, the other end of the output shaft extending into the channel and toward the end cap, the double helix pendulum hydraulic cylinder further comprising:
the first limiting piece is arranged in the channel and positioned between one end of the output rotating shaft and the first oil delivery hole;
the second limiting part is arranged in the channel and positioned between the fixing part and the end cover, and the second limiting part is matched with the first limiting part to limit the axial displacement of the output rotating shaft.
3. The double-helix oscillating hydraulic cylinder according to claim 2, wherein a first counter bore extending along the circumferential direction of the inner surface of the channel is provided in the channel, and the first stopper is provided in the first counter bore and is fixedly connected to the cylinder body.
4. The double helix pendulum hydraulic cylinder of claim 3, further comprising:
the first plane thrust needle roller bearing is arranged between the first limiting piece and one end of the output rotating shaft.
5. The double helix pendulum hydraulic cylinder of claim 4 wherein the output shaft comprises, in the axial direction of the channel:
the first section body is arranged on one side of the channel, the radial size of the first section body is larger than that of the channel, and the first section body is connected with the cylinder body;
the second section body is arranged in the channel, one end of the second section body is connected with the first section body, the other end of the second section body is provided with step parts which are distributed along the axial direction of the channel, and the first plane thrust needle roller bearing is arranged on the step parts;
the third section body is arranged in the channel, one end of the third section body is connected with the other end of the second section body, the radial size of the third section body is smaller than that of the second section body, and the first limiting piece is arranged between the third section body and the inner wall surface of the channel.
6. The double helix pendulum hydraulic cylinder of claim 5 wherein the threads on the output shaft corresponding to the first pair of helices are spaced from the third segment.
7. The double-helix oscillating hydraulic cylinder according to claim 2, wherein a second counterbore extending along the circumferential direction of the inner surface of the passage is provided in the passage, and the second stopper is provided in the second counterbore and is fixedly connected to the cylinder body.
8. The double helix pendulum hydraulic cylinder of claim 7, further comprising:
and the second plane thrust needle bearing is arranged between the second limiting piece and the end cover.
9. The double helix pendulum hydraulic cylinder of claim 1 wherein the output shaft is formed as a hollow member.
10. The double helix pendulum hydraulic cylinder of claim 1, wherein the securing member is welded to the cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114959.3A CN111173802A (en) | 2020-02-25 | 2020-02-25 | Double-helix swing hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114959.3A CN111173802A (en) | 2020-02-25 | 2020-02-25 | Double-helix swing hydraulic cylinder |
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| CN111173802A true CN111173802A (en) | 2020-05-19 |
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| CN202010114959.3A Pending CN111173802A (en) | 2020-02-25 | 2020-02-25 | Double-helix swing hydraulic cylinder |
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| CN101372992A (en) * | 2008-06-04 | 2009-02-25 | 郭玉恒 | Method for converting fluid input into torque and swinging angle outputs and specific oil cylinder |
| US20150267722A1 (en) * | 2014-03-24 | 2015-09-24 | SH PAC Co., Ltd. | Rotary Actuator |
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| CN105650052A (en) * | 2016-03-31 | 2016-06-08 | 江阴市洪腾机械有限公司 | Dual-spiral swing hydraulic cylinder |
| CN206123699U (en) * | 2016-09-09 | 2017-04-26 | 广东工业大学 | Hydraulic pressure joint reaches by its robot that constitutes |
| CN108098826A (en) * | 2017-12-13 | 2018-06-01 | 同济大学 | A kind of large scale industry robot hydraulic servo-joint |
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Application publication date: 20200519 |