CN211259524U - Sliding sleeve limiting mechanism - Google Patents
Sliding sleeve limiting mechanism Download PDFInfo
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- CN211259524U CN211259524U CN201922334953.2U CN201922334953U CN211259524U CN 211259524 U CN211259524 U CN 211259524U CN 201922334953 U CN201922334953 U CN 201922334953U CN 211259524 U CN211259524 U CN 211259524U
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- sleeve
- nut
- screw rod
- nut sleeve
- push rod
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Abstract
The utility model discloses a sliding sleeve limiting mechanism, which comprises a screw rod and a nut outer sleeve in threaded connection with the screw rod, wherein the nut outer sleeve comprises a first nut sleeve and a second nut sleeve, the inner layer of the first nut sleeve is in threaded connection with the screw rod, the outer layer of the second nut sleeve is, and an anti-rotation structure is arranged between the first nut sleeve and the second nut sleeve; the second nut sleeve is provided with a first key groove penetrating through the wall thickness, a flat key capable of protruding out of the outer surface of the second nut sleeve is arranged in the first key groove, the nut outer sleeve is positioned inside one end of the push rod, and the inner wall of the push rod is provided with a second key groove matched with the flat key. Adopt the utility model discloses a back can provide an inside sliding sleeve stop gear who has limit structure, prevents that the nut overcoat from roll-off from the push rod.
Description
Technical Field
The utility model relates to a stop gear, especially a sliding sleeve stop gear.
Background
The existing tools or equipment which use a screw rod to make a part do axial reciprocating motion are provided with a screw jack and an electric push rod. The principle of the screw jack is that a handle is pulled in a reciprocating manner, a pulling claw pushes a ratchet wheel to rotate in a clearance manner, a bevel pinion drives a bevel pinion to rotate a lifting screw rod, so that a lifting sleeve rises or falls, and the thread of the screw jack has no self-locking effect. The electric push rod is a pair of screw rod nuts driven by the motor after the motor is decelerated by the gear. The rotary motion of the motor is changed into linear motion, and the push rod action is completed by utilizing the positive and negative rotation of the motor.
When specifically using, be in the reason of cooperation external structure, the relative position between push rod and the nut overcoat often need be injectd, otherwise the nut overcoat can follow the interior roll-off of push rod, often sets up limit structure in the outside of push rod among the prior art, but in some narrower positions, receives the influence of available space, and external limit structure is difficult to set up.
Disclosure of Invention
The utility model aims to provide a: the sliding sleeve limiting mechanism with the limiting structure inside the push rod is provided, and the problem that the limiting structure of the push rod and the nut outer sleeve cannot be arranged outside due to space limitation in the prior art is solved.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a sliding sleeve limiting mechanism comprises a screw and a nut outer sleeve in threaded connection with the screw, wherein the nut outer sleeve comprises a first nut sleeve and a second nut sleeve, the inner layer of the first nut sleeve is in threaded connection with the screw, the outer layer of the second nut sleeve is provided with an anti-rotation structure, and the anti-rotation structure is arranged between the first nut sleeve and the second nut sleeve; the second nut sleeve is provided with a first key groove penetrating through the wall thickness, a flat key capable of protruding out of the outer surface of the second nut sleeve is arranged in the first key groove, the nut outer sleeve is positioned inside one end of the push rod, and the inner wall of the push rod is provided with a second key groove matched with the flat key. The inner wall of the push rod is provided with a second key groove, the flat key is limited in the second key groove, the freedom degree of circumferential rotation of the flat key is limited, and meanwhile, the flat key is fixed on the nut outer sleeve, so that the moving distance of the nut outer sleeve in the push rod is limited, namely the relative displacement between the nut outer sleeve and the push rod is limited; the screw rod is driven by the driving device to rotate, under the condition that the push rod is limited to rotate, the screw rod rotates relative to the nut outer sleeve, the nut outer sleeve moves axially, and the anti-rotation structure enables the circumferential positions of the first nut sleeve on the inner layer and the second nut sleeve on the outer layer to be relatively fixed, so that the first nut sleeve and the second nut sleeve move relative to the screw rod; the first key groove penetrates through the wall thickness of the second nut sleeve, so that the flat key can be installed from an inner hole of the nut outer sleeve and then installed into the first key groove; the nut outer sleeve with the two-layer structure prevents the flat key from contacting the screw rod to damage the screw rod or interfere the movement of the nut.
Furthermore, the anti-rotation structure is formed by a spline matching structure; the first nut sleeve forms a spline shaft structure through a plurality of circumferential protrusions; the second nut sleeve forms a spline sleeve structure through spline grooves matched with the protrusions. The first nut sleeve and the second nut sleeve form a connecting structure which is convenient to disassemble and assemble through a spline matching structure, and the first nut sleeve and the second nut sleeve are ensured to jointly form a nut structure.
Furthermore, the bulges are uniformly distributed on the periphery of the first nut sleeve, and the number of the bulges is four. 4 bulges reduce the circumferential shearing force applied to a single bulge when the screw rod rotates, and the first nut sleeve and the second nut sleeve are uniformly stressed in the circumferential direction due to uniform distribution.
Further, the flat keys are only matched in the first key groove on the second nut sleeve in a radially movable mode, and the number of the flat keys is two and the flat keys are symmetrically distributed on the outer periphery of the second nut sleeve. The flat keys are symmetrically distributed, so that the nut outer sleeve is subjected to uniform resistance when moving to the limit position of the push rod.
Furthermore, the push rod is provided with a large-diameter section and a small-diameter section, the nut outer sleeve is located in the large-diameter section, and the head of the screw rod can stretch into the small-diameter section. According to the diameters of the nut outer sleeve and the screw rod, the outer diameter of the push rod is reasonably set, the outer diameter of the push rod is divided into a large-diameter section and a small-diameter section, and the push rod is lightened while the occupied space of the push rod is reduced.
Further, one end of the second nut sleeve, which is far away from the head of the screw rod, is connected with a plug sleeve in a threaded mode. The plug sleeve fixes the first nut sleeve in the second nut sleeve, so that the first nut sleeve and the second nut sleeve are fixedly connected into a whole to move synchronously when moving axially along the screw; in addition, the plug bush can also reduce dust entering the push rod, and meanwhile, small parts inside the push rod are prevented from falling out.
Furthermore, the head of the screw rod is sleeved with a support ring, and the support ring is in clearance fit with the inner hole of the small-diameter section. In the screw motion process, the screw head stretches into the minor diameter section of push rod all the time, and the support ring plays the effect of direction and support to the motion of screw rod, and the support ring can adopt the nylon preparation.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: in less space, make to have limit structure between nut overcoat and the push rod for the nut overcoat does not follow the interior roll-off of push rod in the use, has ensured the normal use of mechanism.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural diagram of the sliding sleeve limiting mechanism of the present invention at the first limit position.
Fig. 2 shows a partial cross-sectional view of the nut casing of fig. 1.
Fig. 3 shows a schematic structural diagram of the sliding sleeve limiting mechanism of the present invention at the second limit position.
Fig. 4 shows a partial cross-sectional view of the nut casing of fig. 3.
Fig. 5 shows a schematic cross-sectional structure at a-a in fig. 4.
Wherein the figures include the following reference numerals:
1. a screw; 2. a nut is sleeved; 21. a first nut sleeve; 211. a protrusion; 22. a second nut sleeve; 3. a flat bond; 4. a push rod; 41. a second keyway; 5. a plug sleeve; 6. and (3) supporting the ring.
Detailed Description
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
A sliding sleeve limiting mechanism comprises a screw rod 1 and a nut outer sleeve 2 in threaded connection with the screw rod 1, wherein the nut outer sleeve 2 comprises a first nut sleeve 21 of which the inner layer is in threaded connection with the screw rod 1 and a second nut sleeve 22 of which the outer layer is, and an anti-rotation structure is arranged between the first nut sleeve 21 and the second nut sleeve 22; the second nut sleeve 22 is provided with a first key groove penetrating through the wall thickness, a flat key 3 capable of protruding out of the outer surface of the second nut sleeve 22 is arranged in the first key groove, the nut outer sleeve 2 is located inside one end of the push rod 4, and the inner wall of the push rod 4 is provided with a second key groove 41 matched with the flat key 3.
Preferably, the anti-rotation structure is formed by a spline matching structure; the first nut bushing 21 forms a spline shaft structure by a plurality of circumferential protrusions 211; the second nut case 22 forms a spline case structure by spline grooves that mate with the protrusions 211.
Preferably, the protrusions 211 are uniformly distributed on the outer circumference of the first nut case 21 and the number thereof is four.
Preferably, the flat keys 3 are fitted in the first key grooves on the second nut socket 22 only in a radially movable manner, and the number of the flat keys 3 is two and is symmetrically distributed on the outer circumference of the second nut socket 22.
Preferably, the push rod 4 is provided with a large-diameter section and a small-diameter section, the nut outer sleeve 2 is positioned in the large-diameter section, and the head of the screw rod can extend into the small-diameter section.
Preferably, the end of the second nut socket 22 remote from the head of the screw is threadedly connected with the plug socket 5.
Preferably, the head of the screw 1 is sleeved with a support ring 6, and the support ring 6 is in clearance fit with the inner hole of the small-diameter section.
As shown in fig. 1 and 2, the flat key 3 is located at the rightmost end of the second key groove 41, and the relative position of the nut outer sleeve 2 and the push rod 4 reaches a first limit position; as shown in fig. 3 and 4, the flat key 3 is located at the leftmost end of the second key groove 41, and the relative position of the nut housing 2 and the push rod 4 reaches a second extreme position; fig. 5 is a schematic cross-sectional structure view at a-a in fig. 4, where the number of the flat keys 3 in this embodiment is two, and the number of the flat keys 3 may be one or more in specific applications.
During specific assembly, the flat key 3 is clamped on the second nut sleeve 22, and the flat key 3 does not protrude out of the outer surface of the second nut sleeve 22; fitting the second nut sleeve 22 into the push rod 4 such that the flat key 3 is aligned with the second key groove 41; pushing the flat key 3 into the second key groove 41, wherein the flat key 3 is simultaneously positioned in the second key groove 41 and the outer wall of the second nut sleeve 22, and the flat key 3 does not extend into the inner wall of the second nut sleeve 22; screwing the screw rod 1 into the first nut sleeve 21, and installing the support ring 6 on the head part of the screw rod 1; the first nut sleeve 21 is arranged in the second nut sleeve 22, and the first nut sleeve and the second nut sleeve are circumferentially fixed through an anti-rotation structure; the plug sleeve 5 and the first nut sleeve 21 are screwed tightly through threaded connection; the remaining components are assembled in sequence. After assembly, the push rod 4 is kept to be not rotated due to external connection, the nut outer sleeve 2 is clamped in the groove of the push rod 4 through the flat key 3, and the groove of the push rod 4 is a long groove arranged along the axial direction, so that the nut outer sleeve 2 cannot rotate, the whole nut outer sleeve 2 moves along the axial direction of the screw rod 1 along with the rotation of the screw rod 1, and the push rod 4 is driven to move along the axial direction when the nut outer sleeve 2 moves to abut against one end of the second key groove 41; but the magnitude of the relative displacement between the nut housing 2 and the push rod 4 remains unchanged, the relative displacement being the difference between the lengths of the second keyway 41 and the flat key 3.
The scope of the present invention is defined not by the above-described embodiments but by the appended claims and equivalents thereof.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A sliding sleeve limiting mechanism comprises a screw rod (1) and a nut outer sleeve (2) in threaded connection with the screw rod (1), and is characterized in that the nut outer sleeve (2) comprises a first nut sleeve (21) with an inner layer in threaded connection with the screw rod (1) and a second nut sleeve (22) with an outer layer, and an anti-rotation structure is arranged between the first nut sleeve (21) and the second nut sleeve (22); the nut is characterized in that a first key groove penetrating through the wall thickness is formed in the second nut sleeve (22), a flat key (3) capable of protruding out of the outer surface of the second nut sleeve (22) is arranged in the first key groove, the nut outer sleeve (2) is located inside one end of the push rod (4), and a second key groove (41) matched with the flat key (3) is formed in the inner wall of the push rod (4).
2. The sliding sleeve limiting mechanism according to claim 1, wherein the anti-rotation structure is formed by a spline fit structure; the first nut sleeve (21) forms a spline shaft structure through a plurality of circumferential protrusions (211); the second nut sleeve (22) forms a spline sleeve structure through a spline groove matched with the bulge (211).
3. The sliding sleeve limiting mechanism according to claim 2, wherein the protrusions (211) are uniformly distributed on the periphery of the first nut sleeve (21) and are four in number.
4. The sliding sleeve limiting mechanism according to claim 1, characterized in that the flat keys (3) are fitted in the first key grooves on the second nut sleeve (22) only in a radially movable manner, and the number of the flat keys (3) is two and is symmetrically distributed on the outer periphery of the second nut sleeve (22).
5. The sliding sleeve limiting mechanism according to claim 1, wherein the push rod (4) is provided with a large diameter section and a small diameter section, the nut outer sleeve (2) is positioned in the large diameter section, and the head of the screw rod (1) can extend into the small diameter section.
6. The sliding sleeve limiting mechanism according to claim 5, wherein a plug sleeve (5) is connected to one end of the second nut sleeve (22) far away from the head of the screw rod (1) in a threaded manner.
7. The sliding sleeve limiting mechanism according to claim 5, wherein a support ring (6) is sleeved on the head of the screw rod (1), and the support ring (6) is in clearance fit with the inner hole of the small-diameter section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922334953.2U CN211259524U (en) | 2019-12-23 | 2019-12-23 | Sliding sleeve limiting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922334953.2U CN211259524U (en) | 2019-12-23 | 2019-12-23 | Sliding sleeve limiting mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211259524U true CN211259524U (en) | 2020-08-14 |
Family
ID=71986920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922334953.2U Active CN211259524U (en) | 2019-12-23 | 2019-12-23 | Sliding sleeve limiting mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211259524U (en) |
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2019
- 2019-12-23 CN CN201922334953.2U patent/CN211259524U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: Floors 8 and 9, No. 274 Xuecheng Avenue, Huxi Street, High tech Zone, Chongqing, 401331 Patentee after: CHONGQING LANGZHENG TECHNOLOGY Co.,Ltd. Address before: 400039 No.1, 8th Floor, Overseas Chinese Entrepreneurship Park, Erlang Science and Technology Innovation Road, Jiulongpo District, Chongqing Patentee before: CHONGQING LANGZHENG TECHNOLOGY Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |