Sliding sleeve assembly structure for telescopic sleeve and linear actuator

Abstract

The sliding sleeve assembling structure comprises an outer pipe, a sliding sleeve and an inner pipe, the inner pipe is arranged in the outer pipe and can slide in the axial direction of the outer pipe, the sliding sleeve is located between the inner wall of the outer pipe and the outer wall of the inner pipe, and when the inner pipe and the outer pipe are assembled, the sliding sleeve is preassembled at a pipe opening of the outer pipe. The embedded structure of the outer pipe and the inner pipe is simple in overall structure and low in manufacturing cost, manufacturing and assembling complexity is reduced, production and assembling efficiency can be improved, after assembling is completed, the wall thickness of the sliding sleeve is close to the distance between the inner pipe and the outer pipe, the sliding sleeve is not prone to falling off, and the embedded structure of the outer pipe and the inner pipe is convenient to assemble. The clearance between the inner pipe and the outer pipe is small, the sliding sleeve is not prone to self-disengaging or being pulled out easily, and sliding between the outer pipe and the inner pipe is more stable and smoother. The utility model further discloses a linear actuator adopting the sliding sleeve assembly structure for the telescopic sleeve.

Description

Technical Field

[0001] This utility model relates to the field of telescopic sleeve technology, specifically to a sliding sleeve assembly structure and linear actuator for telescopic sleeves. Background Technology

[0002] Linear actuators are core components of smart furniture such as electric height-adjustable desks, height-adjustable islands, height-adjustable cabinets, and TV height-adjustable brackets. Their movement is manifested as the linear reciprocating motion of extendable tubing. Typically, sliders, sliding sleeves, or other structures are installed between the relatively moving tubing to support the tubing, reduce friction, and eliminate backlash.

[0003] Chinese patent CN211882724U discloses a non-perforated sleeve structure with a decorative sleeve and a linear actuator using this structure. The outer tube has an inner wall groove. The decorative sleeve (i.e., a sliding sleeve) has a snap-fit ​​component with a locking head for engaging with the inner wall groove. The snap-fit ​​component is elastically deformable. During assembly, the decorative sleeve is first fitted onto the inner tube, and then the inner tube is inserted into the outer tube. A force is manually applied to the snap-fit ​​component, causing it to elastically deform. Since the thickness of the locking head is less than the distance between the inner and outer tubes, the snap-fit ​​component is inserted into the gap to maintain its elastic deformation. The decorative sleeve extends forward along the axial direction of the outer tube until the locking head moves to the inner wall groove, at which point the snap-fit ​​component returns to its elastic deformation, allowing the locking head to engage with the inner wall groove. In this design, the installation of the decorative sleeve requires manual force to the snap-fit ​​component, making the installation process laborious and time-consuming. Furthermore, the wall thickness of the decorative sleeve is less than the distance between the inner and outer tubes, making it prone to wobbling during operation, and the decorative sleeve is easily detached or pulled out.

[0004] Chinese patent CN204580325U discloses a sleeve structure and a lifting column. The inner wall of the first sleeve (outer tube) has a groove, and the first slider (sliding sleeve) has a connecting part. Each connecting part extends to the location of the groove inside the first sleeve, and the connecting part has a locking part that engages with the groove at that location. To accommodate the locking part, whose thickness is greater than the distance between the inner wall of the first sleeve and the outer wall of the second sleeve (inner tube), into the groove on the inner wall of the first sleeve, a slotted structure is formed on the second sleeve to avoid the locking part. These slotted structures typically require laser cutting, resulting in high manufacturing costs. Furthermore, creating slotted structures on the tube wall can cause localized stress changes, leading to deformation of the tube and affecting the accuracy and smoothness of the telescopic movement. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects of the prior art and provide a decorative sleeve assembly structure for telescopic sleeves, which solves the problems of cumbersome installation and low assembly efficiency of the sliding sleeve in the prior art.

[0006] To achieve the above and other objectives, this utility model is implemented through the following technical solution: As a first aspect, this utility model proposes a decorative sleeve assembly structure for a telescopic sleeve, including an outer tube, a sliding sleeve and an inner tube, wherein the inner tube is installed inside the outer tube and can slide along the axial direction of the outer tube, the sliding sleeve is located between the inner wall of the outer tube and the outer wall of the inner tube, and when the inner tube is assembled with the outer tube, the sliding sleeve is pre-installed at the opening of the outer tube.

[0007] Furthermore, the sliding sleeve includes an outer ring, a liner, and a buckle. The outer ring fits against the end face of the outer tube. The liner is disposed on the inner wall of the outer ring and extends into the outer tube. The outer end face of the liner protrudes outward to form a buckle. The buckle engages with the positioning groove of the outer tube opening to fix the sliding sleeve to the outer tube opening.

[0008] Furthermore, the lining is provided with an inner bevel at one end connected to the outer ring.

[0009] Furthermore, the liner is designed to be disconnected, with a clearance groove formed between two adjacent liners.

[0010] Furthermore, the inner tube opening is provided with a slider assembly, the opening is inserted into the outer tube, the slider assembly includes a plurality of sliding pieces, the sliding pieces are distributed on the outer wall of the inner tube, and when the inner tube is inserted into the outer tube, the sliding pieces correspond to the clearance groove.

[0011] Furthermore, the inner tube opening is provided with a slider assembly, the opening is inserted into the outer tube, the slider assembly includes a nut and a sliding plate, the nut is provided with a mounting groove, the nut has a threaded hole in the center, the inner tube opening is provided with a fixing part, the mounting groove and the fixing part cooperate to fix the nut to the inner tube opening.

[0012] Furthermore, one end of the sliding piece is fixed to the nut, and the other end of the sliding piece extends beyond the end face of the nut and is inclined outward. After the outer tube and the inner tube are assembled, the sliding piece abuts against the inner wall of the outer tube.

[0013] Furthermore, the other end of the sliding piece has a guide bevel. When the sliding assembly and the inner tube are inserted into the outer tube, the guide bevel interacts with the end face of the outer tube or the end face of the outer ring, causing the sliding piece to elastically deform inward.

[0014] Furthermore, when the sliding assembly and the inner tube are inserted into the outer tube, the sliding piece enters the outer tube through the clearance groove.

[0015] This invention also provides a linear actuator, including the sliding sleeve assembly structure for telescopic sleeves as described above.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model has a simple overall structure and low manufacturing cost;

[0018] 2. This utility model reduces the complexity of manufacturing and assembly, and helps to improve production and assembly efficiency;

[0019] 3. The liner of this utility model is provided with a guide inner inclined surface, which can play a guiding role and improve the smoothness of installation when the inner tube is inserted;

[0020] 4. The sliding sleeve of this utility model is provided with a relief groove, so that the sliding plate and the inner tube can be smoothly installed into the outer tube through the relief groove without causing damage to the lining.

[0021] 5. The wall thickness of the sliding sleeve of this utility model is close to the distance between the inner and outer tubes, the clearance between the outer tube and the inner tube is small, the sliding sleeve is not easy to detach or is easy to be pulled out, and the sliding between the outer tube and the inner tube is more stable and smooth.

[0022] 6. Integrating the sliding pieces onto the nut allows for one-step installation of all sliding pieces, further improving assembly efficiency;

[0023] 7. The sliding plate is tilted outward, and the outer end face of the sliding plate abuts against the inner wall of the outer tube, which can ensure that the circumferential gap between the inner tube and the outer tube is uniform during sliding, making the sliding process smoother. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 The image shown is a partial cross-sectional view of Embodiment 1 of this utility model.

[0026] Figure 2 The image shown is a perspective view of the outer tube and sliding assembly of Embodiment 1 of this utility model.

[0027] Figure 3 The diagram shown is an assembly diagram of the outer tube and sliding sleeve according to Embodiment 1 of this utility model.

[0028] Figure 4 The image shown is a perspective view of the sliding sleeve according to Embodiment 1 of this utility model.

[0029] Figure 5 The image shown is a front view of the sliding sleeve according to Embodiment 1 of this utility model.

[0030] Figure 6 The diagram shown is an assembly drawing of the telescopic sleeve according to Embodiment 1 of this utility model.

[0031] Figure 7 The diagram shown is an assembly drawing of the telescopic sleeve according to Embodiment 2 of this utility model.

[0032] Figure 8 The diagram shown is an assembly diagram of the inner tube and sliding assembly according to Embodiment 2 of this utility model.

[0033] In the diagram: 1. Outer tube, 2. Sliding sleeve, 21. Outer ring, 22. Liner, 23. Buckle, 24. Inner bevel, 25. Clearance groove, 3. Inner tube, 31. Fixing part, 41. Sliding piece, 42. Nut, 43. Mounting groove. Detailed Implementation

[0034] Please see Figures 1-8 The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0035] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0036] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “a,” “an,” or “the,” as used herein, do not indicate a limitation of quantity, but are merely used to indicate the presence of at least one. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The term “connection” as used herein, unless otherwise specified, includes both direct and indirect connections.

[0037] To avoid confusion with this utility model, some technical features known in the art have not been described.

[0038] Example 1

[0039] like Figures 1-6 As shown, this embodiment provides a sliding sleeve assembly structure for telescopic sleeves, including an outer tube 1, a sliding sleeve 2, and an inner tube 3. The inner tube 3 is installed inside the outer tube 1 and can slide along the axial direction of the outer tube 1. The sliding sleeve 2 is fixed to the opening of the outer tube 1 and is located between the inner wall of the outer tube 1 and the outer wall of the inner tube 3, playing the role of supporting the pipe fitting and eliminating clearance, so that the sliding between the outer tube 1 and the inner tube 3 is more stable and smooth.

[0040] The sliding sleeve 2 includes an outer ring 21, a liner 22, and a buckle 23. The outer ring 21 has the same shape as the end face of the outer tube 1, and can be a regular polygon, rectangle, circle, ellipse, etc. The inner wall of the outer ring 21 is provided with a liner 22 that is arranged along the axial direction of the outer tube 1 and extends into the outer tube 1. The liner 22 fits against the inner wall of the outer tube 1, and the outer end face of the liner 22 protrudes outward to form a buckle 23. The buckle 23 engages with the positioning groove of the outer tube 1 opening to fix the sliding sleeve 2 to the outer tube 1 opening.

[0041] The sliding sleeve 2 is preferably made of polypropylene, which has good bending resistance. During assembly, the liner 22 is first inserted into the outer tube 1. The liner 22 is deformed inward by the pressure of the inner wall of the outer tube 1. The liner 22 continues to be inserted into the outer tube 1 along the axial direction until the outer ring 21 is in contact with the end face of the outer tube 1. At this time, a force is manually applied to the liner 22 so that the buckle 23 is engaged in the positioning groove of the outer tube 1. The outer end face of the liner 22 is in contact with the inner wall of the outer tube 1, completing the assembly between the sliding sleeve 2 and the outer tube 1. Of course, it is also possible not to manually engage the buckle 23 with the positioning groove. When the inner tube 3 is inserted into the outer tube 1, the liner 22 is squeezed by the outer wall of the inner tube 3 so that the buckle 23 is engaged in the positioning groove of the outer tube 1.

[0042] To facilitate the inward deformation of the lining 22, the lining 22 of the sliding sleeve 2 can be designed to be disconnected. When the outer ring 21 is a regular polygon or rectangle, a lining 22 is provided on each side or two opposite sides of the outer ring 21; when the outer ring 21 is circular or elliptical, the lining 22 is arc-shaped and can be symmetrically or evenly distributed on the circumference of the outer ring 21, with a clearance groove 25 formed between two adjacent linings 22. The end of the lining 22 connected to the outer ring 21 has an inner inclined surface 24. When the inner tube 3 is inserted into the outer tube 1 from the side where the sliding sleeve 2 is located, the inner inclined surface 24 can guide the inner tube 3 into place, reducing resistance and friction during assembly and improving assembly efficiency.

[0043] like Figure 6 As shown, a slider assembly is provided on the side of the inner tube 3 that is inserted into the outer tube 1. The slider assembly consists of several sliding pieces 41, which are distributed on the outer wall of the inner tube 3. When the outer tube 1 and the inner tube 3 slide relative to each other, the slider assembly plays a role in supporting the tube and eliminating clearance. Since the sliding pieces 41 have a certain thickness, when the inner tube 3 is inserted into the outer tube 1, the sliding pieces 41 are smoothly inserted into the outer tube 1 through the clearance groove 25, so as not to damage or destroy the lining 22.

[0044] The assembly process of the telescopic sleeve is as follows:

[0045] 1. Complete the assembly of sliding sleeve 2 with outer tube 1 and slider assembly with inner tube 3 respectively;

[0046] 2. Insert the end of the inner tube 3 with the sliding component into the outer tube 1 from the end of the outer tube 1 with the sliding sleeve 2 pre-installed, thus completing the nested structure of the outer tube 1 and the inner tube 3.

[0047] Example 2

[0048] like Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that: the slider assembly is fixed to the opening of the inner tube 3. The slider assembly includes a nut 42 and a sliding plate 41. The outer shape of the nut 42 is adapted to the end face shape of the inner tube 3. The nut 42 has a threaded hole in the center and a mounting groove 43 on the nut 42. The mounting groove 43 can be a pit, a through hole, a blind hole, or a milled groove, etc. The opening of the inner tube 3 is provided with a fixing part 31. After the nut 42 is partially inserted into the inner tube 3, it is fixed to the opening of the inner tube 3 through the mounting groove 43 and the fixing part 31. Multiple sliding pieces 41 are distributed around the nut 42 and protrude from the nut 42. One end of the sliding piece 41 is fixed to the nut 42, and the other end of the sliding piece 41 extends beyond the end face of the nut 42. Due to its elastic outward tilt, the other end of the sliding piece 41 has a guide outer inclined surface. When the sliding assembly and the inner tube 3 are installed into the outer tube 1, the guide outer inclined surface interacts with the end face of the outer tube 1 or the end face of the outer ring 21, causing the sliding piece 41 to elastically deform inward. The sliding piece 41 enters the outer tube 1 through the clearance groove 25. After the outer tube 1 and the inner tube 3 are assembled, the sliding piece 41 abuts against the inner wall of the outer tube 1, thereby supporting the inner tube 3 and the outer tube 1 and eliminating clearance.

[0049] The sliding sleeve assembly structure for telescopic sleeves in Examples 1 and 2 can be applied to linear actuators.

[0050] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A sliding sleeve assembly for a sliding sleeve casing, comprising an outer tube (1), a sliding sleeve (2) and an inner tube (3), the inner tube (3) being arranged within the outer tube (1) and being axially slidable along the outer tube (1), the sliding sleeve (2) being located between the inner wall of the outer tube (1) and the outer wall of the inner tube (3), characterized in that: The inner tube (3) is assembled with the outer tube (1), and the sliding sleeve (2) is preassembled on the pipe opening of the outer tube (1).

2. The sliding cover assembly for a telescopic sleeve according to claim 1, characterized in that: The sliding sleeve (2) comprises an outer sleeve ring (21), a lining (22) and a buckle (23), the outer sleeve ring (21) is attached to the end face of the outer tube (1), the lining (22) is arranged on the inner wall of the outer sleeve ring (21) and extends to the inside of the outer tube (1), the outer end face of the lining (22) is outwardly convex to form the buckle (23), the buckle (23) is clamped with the positioning groove of the pipe opening of the outer tube (1) to fix the sliding sleeve (2) on the pipe opening of the outer tube (1).

3. The sliding sleeve assembly for a sliding sleeve of claim 2, wherein: The lining (22) is connected to one end of the outer sleeve ring (21) and is provided with an inner inclined surface (24).

4. The sliding cover assembly for a telescopic sleeve according to claim 2, characterized in that: The lining (22) is designed to be disconnected, and the avoidance groove (25) is formed between the adjacent two linings (22).

5. The sliding sleeve assembly for a sliding sleeve of claim 4, wherein: The pipe opening of the inner tube (3) is provided with a sliding block assembly, the pipe opening is assembled into the outer tube (1), the sliding block assembly comprises a plurality of sliding pieces (41), the sliding pieces (41) are distributed on the outer wall of the inner tube (3), and the sliding pieces (41) correspond to the avoidance groove (25) when the inner tube (3) is assembled into the outer tube (1).

6. The sliding cover assembly for a telescopic sleeve according to claim 4, characterized in that: The pipe opening of the inner tube (3) is provided with a sliding block assembly, the pipe opening is assembled into the outer tube (1), the sliding block assembly comprises a nut (42) and a sliding piece (41), the nut (42) is provided with a mounting groove (43), the center of the nut (42) is provided with a threaded hole, the pipe opening of the inner tube (3) is provided with a fixing part (31), and the mounting groove (43) and the fixing part (31) are matched to fix the nut (42) on the pipe opening of the inner tube (3).

7. The sliding cover assembly for a telescopic sleeve according to claim 6, characterized in that: One end of the sliding piece (41) is fixed on the nut (42), the other end of the sliding piece (41) exceeds the end face of the nut (42) and is outwardly inclined, and the sliding piece (41) abuts against the inner wall of the outer tube (1) when the outer tube (1) and the inner tube (3) are completely assembled.

8. The sliding cover assembly for a telescopic sleeve according to claim 7, characterized in that: The other end of the sliding piece (41) has a guide outer inclined surface, and the guide outer inclined surface interacts with the pipe opening end face of the outer tube (1) or the end face of the outer sleeve ring (21) to make the sliding piece (41) elastically deform inwardly when the sliding assembly is assembled with the inner tube (3) into the outer tube (1).

9. The sliding sleeve assembly for a telescoping casing of claim 8, wherein: When the sliding assembly is assembled with the inner tube (3) into the outer tube (1), the sliding piece (41) enters the outer tube (1) through the avoidance groove (25).

10. A linear actuator characterized by: The sliding sleeve assembly structure for the telescopic sleeve according to any one of claims 1-9 is included.

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