Bidirectional non-return structure

Abstract

The utility model discloses a bidirectional non-return structure which comprises a sleeve, a shifting fork, an inner rotating disc and a torsional spring. The shifting fork, the inner turntable and the torsional spring are all inserted into the sleeve; the insertion arm of the shifting fork and the insertion arm of the inner rotating disc are oppositely inserted into the torsion spring, and the two bent ends of the torsion spring are both located on the inner ring side; the two insertion arms of the shifting fork are respectively supported on the inner sides of the two bent end parts; one insertion arm of the inner rotating disc is supported on the outer side of one bent end, and the other insertion arm is located on the inner sides of the two bent ends and located between the two insertion arms of the shifting fork. The bidirectional check valve has the advantages of being simple in structure and capable of supporting bidirectional instant check.

Description

Technical Field

[0001] This utility model belongs to the technical field of transmission components, and in particular relates to a bidirectional backstop structure. Background Technology

[0002] In mechanical transmission systems, double-acting backstops are critical safety components that prevent reverse rotation of the input end of the equipment due to reaction forces generated at the load end, especially in equipment such as electric cylinders that extend and retract. Existing technology mainly uses wedge-type backstops (such as irregularly shaped wedges nested in the inner and outer raceways), which achieve backstop by squeezing the inner and outer raceways together when the circuit reverses.

[0003] However, such structures have significant drawbacks: traditional wedge backstops only support reverse locking in a single rotation direction, and the backstop must be disassembled when the equipment needs to be reversed, which is cumbersome and affects efficiency; multi-wedge layouts require precise calculation of dimensions and friction coefficients (such as ANSYS simulation verification), otherwise the backstop torque may be insufficient due to wedge deflection failure.

[0004] Therefore, there is an urgent need for a solution that is simple in structure and supports bidirectional instantaneous backstop. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a bidirectional reverse stop structure to address the shortcomings of the prior art. It has the characteristics of simple structure and support for bidirectional instant reverse stop. It realizes the unique bidirectional function that "the fork can drive the inner turntable in both forward and reverse rotation, but the inner turntable is braked when it rotates actively". It solves the problem of how to prevent the output end from driving the input end in reverse, and provides a more reliable anti-reverse drive capability in engineering applications (such as high-altitude machinery and automated equipment).

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a bidirectional anti-reverse structure, including a sleeve, a shift fork, an inner turntable, and a torsion spring; the shift fork, the inner turntable, and the torsion spring are all inserted inside the sleeve; the insert arm of the shift fork and the insert arm of the inner turntable are inserted into the inside of the torsion spring, and the two bent ends of the torsion spring are both located on the inner ring side; the two insert arms of the shift fork are respectively supported on the inner side of the two bent ends; one insert arm of the inner turntable is supported on the outer side of one of the bent ends, and the other insert arm is located on the inner side of the two bent ends and between the two insert arms of the shift fork.

[0007] In the aforementioned bidirectional anti-reverse structure, both the waist of the shift fork and the waist of the inner turntable have ring structures, and the two ring structures limit the position of the two end faces of the torsion spring.

[0008] In the aforementioned bidirectional backstop structure, a bearing is installed between the bushing portion of the inner turntable and the inner wall of the sleeve.

[0009] The outer end of the inner rotating disc is provided with a first open spring ring for limiting the inner ring of the bearing.

[0010] The first open spring ring and the inner ring of the bearing are provided with an adjusting washer.

[0011] The inner ring side of the sleeve is provided with a second open spring ring for limiting the outer end of the shift fork.

[0012] The utility model has the following advantages compared with prior art: through the contraction / expansion behavior of the torsional spring under stress, an asymmetric mechanical mechanism is realized - the torsional spring tightens ( allows rotation) when the shift fork rotates, and the torsional spring expands ( friction brake) when the inner rotating disc rotates actively. The utility model is prominent relative to prior art ( such as one-way brake of single spring), because the utility model combines the geometric layout and fulcrum effect of the torsional spring, so that one component produces completely different effects under different inputs, and the system failure risk is significantly reduced.

[0013] The utility model has the following advantages compared with prior art: through the contraction / expansion behavior of the torsional spring under stress, an asymmetric mechanical mechanism is realized - the torsional spring tightens ( allows rotation) when the shift fork rotates, and the torsional spring expands ( friction brake) when the inner rotating disc rotates actively. The utility model is prominent relative to prior art ( such as one-way brake of single spring), because the utility model combines the geometric layout and fulcrum effect of the torsional spring, so that one component produces completely different effects under different inputs, and the system failure risk is significantly reduced.

[0014] The technical scheme of the utility model will be further described in detail below with the drawings and embodiments. DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model.

[0016] Figure 2 It is an explosion view of the utility model.

[0017] Figure 3 It is a bottom view of the utility model.

[0018] Figure 4 It is Figure 3 A-A sectional view of the utility model.

[0019] Figure 5 It is a front view of the utility model.

[0020] Figure 6 It is a B-B sectional view of the utility model.

[0021] REFERENCE SIGNS:

[0022] 1 - sleeve; 2 - shift fork; 3 - inner rotating disc;

[0023] 4 - torsion spring; 5 - bearing; 6 - first split collar;

[0024] 7 - adjusting washer; 8 - second split collar. DETAILED DESCRIPTION

[0025] As shown in the drawings, Figure 1 — Figure 6 A bidirectional non-return structure, comprising a sleeve 1, a shift fork 2, an inner rotating disc 3 and a torsion spring 4; the shift fork 2, the inner rotating disc 3 and the torsion spring 4 are all inserted into the sleeve 1; the insertion arms of the shift fork 2 and the inner rotating disc 3 are inserted into the torsion spring 4, and the two bent ends of the torsion spring 4 are located on the inner ring side; the two insertion arms of the shift fork 2 are respectively supported on the inner side of the two bent ends; one insertion arm of the inner rotating disc 3 is supported on the outer side of one bent end, and the other insertion arm is located on the inner side of the two bent ends and between the two insertion arms of the shift fork 2.

[0026] It should be noted that the torsion spring 4 has a tendency to tighten when the shift fork 2 rotates, so the shift fork 2 can rotate in both directions, and the inner rotating disc 3 is driven to rotate by the shift fork 2. If the inner rotating disc 3 is actively rotated, it will first drive the torsion spring 4 to expand, and the expansion of the torsion spring 4 and the friction with the inner wall of the sleeve 1 will achieve braking, ultimately resulting in the inner rotating disc 3 being unable to drive the shift fork 2 to rotate.

[0027] This scheme realizes selective bidirectional transmission and anti-back drive function. When the shift fork 2 (input component) rotates forward or reversely, the inner rotating disc 3 (output component) can be passively rotated; but when the inner rotating disc 3 tries to drive actively, the structure will automatically brake to prevent torque from being transmitted in reverse direction. This can significantly improve the safety and reliability of the drive system, while simplifying the structure (only four core components are needed).

[0028] In implementation, the sleeve 1 serves as a shell (a hollow cylinder with an appropriate inner diameter for installation), and the shift fork 2, the inner rotating disc 3 and the torsion spring 4 are inserted into the sleeve 1 in sequence. The torsion spring 4 is a spiral spring with bent end portions (forming the inner ring side) at both ends, for example, the torsion spring 4 is similar to a rolled-up clock spring, and the bent ends are like small hooks pointing to the inner side space. The shift fork 2 has two parallel insertion arms inserted into the torsion spring 4, each abutting against the inner side of one bent end of the torsion spring 4 (i.e. inside the spring hook); the inner rotating disc 3 has two insertion arms, one arm abutting against one bent end of the torsion spring 4 from the outside (i.e. outside the spring hook), and the other arm extending into the inner side of the torsion spring 4 and located between the two arms of the shift fork 2. In assembly, the torsion spring 4 is first placed into the sleeve 1, then the shift fork 2 is inserted to make its arms abut against the inner side of the torsion spring 4, and finally the inner rotating disc 3 is inserted to make one arm abut against the outside and the other arm abut against the middle position.

[0029] Example operation: Suppose in a pedal drive system, the fork 2 is connected to the pedal, the inner rotating disc 3 is connected to the wheel shaft; when the pedal is stepped on (the fork 2 rotates), the torsion spring 4 is tightened, the diameter becomes smaller, and the inner rotating disc 3 easily follows; but when the wheel tries to reverse (the inner rotating disc 3 actively rotates), the arm of the inner rotating disc 3 pushes the torsion spring 4 to expand, the diameter becomes larger, and the inner wall of the friction sleeve 1, generating a braking effect, preventing rotation. The entire installation only needs to manually or with simple tools to insert the components, without the need for precision equipment.

[0030] In this embodiment, the waist of the fork 2 and the waist of the inner rotating disc 3 are both circular ring structures, which limit the positions of the two end faces of the torsion spring 4.

[0031] Through the circular ring limiting, the axial sliding of the torsion spring 4 is prevented, ensuring that the torsion spring 4 maintains a stable position during movement, avoiding jamming or failure caused by deviation, and improving the overall durability and performance consistency of the structure.

[0032] In implementation, the middle section (waist) of the fork 2 and the inner rotating disc 3 are both processed with a protruding circular ring (similar to a thin-walled circular ring-shaped boss). When assembling, after placing the torsion spring 4 into the sleeve 1, insert the fork 2, so that the circular ring of the waist of the fork 2 abuts against one end face of the torsion spring 4; then insert the inner rotating disc 3, so that the circular ring of the waist of the inner rotating disc 3 abuts against the other end face of the torsion spring 4. For example, in the bicycle brake system, the torsion spring 4 needs to be kept centered, and the circular ring acts as a simple retainer, which automatically aligns the two ends of the torsion spring 4 after the components are inserted, preventing the torsion spring 4 from moving in the axial direction (forward and backward). The installation process is direct: after the torsion spring 4 is placed, the fork 2 and the inner rotating disc 3 are sequentially pushed in, and the circular ring is naturally limited without the need for additional steps.

[0033] In this embodiment, a bearing 5 is installed between the shaft sleeve part of the inner rotating disc 3 and the inner wall of the sleeve 1.

[0034] By installing the bearing 5, the friction resistance during rotation of the inner rotating disc 3 is reduced, the service life of the components is prolonged, and the movement of the output part (inner rotating disc 3) is smoother, especially when the torsion spring 4 is frictionally braking, the bearing 5 absorbs part of the force, avoiding direct wear of the sleeve 1.

[0035] In implementation, a standard ball bearing 5 is installed between the shaft sleeve part (a protruding cylindrical body) of the inner rotating disc 3 and the inner wall of the sleeve 1. For example, the shaft sleeve is a short shaft, and the inner wall of the sleeve 1 has a matching diameter hole; during assembly, the bearing 5 is pressed into the hole in the sleeve 1 (a hand press can be used), and then the shaft sleeve of the inner rotating disc 3 is inserted into the inner ring of the bearing 5. Those skilled in the art can directly replace it with a common type of bearing 5 (such as a deep groove ball bearing 5).

[0036] In this embodiment, a first split ring 6 is installed at the outer end of the inner rotating disc 3 to limit the inner ring of the bearing 5.

[0037] The first open spring ring 6 provides axial fixation, prevents the bearing 5 from loosening or shifting, ensures that the inner rotating disc 3 remains stable in position during long-term use, avoids the components from falling off due to vibration, and improves safety and maintenance intervals.

[0038] In implementation, a small groove (annular groove) is processed at the outer end (end of the shaft sleeve) of the inner rotating disc 3, and then the first open spring ring 6 (a C-shaped ring made of spring steel, similar to a locking ring) is installed. After the bearing 5 is installed in place, the open spring ring is embedded in the groove to clamp the inner side of the inner ring of the bearing 5. Those skilled in the art can refer to the standard spring ring installation method without special tools.

[0039] In this embodiment, an adjusting washer 7 is arranged between the first open spring ring 6 and the inner ring of the bearing 5.

[0040] The arrangement of the adjusting washer 7 allows fine adjustment of the axial clearance (looseness), ensures that the components fit tightly and have no play, compensates for manufacturing tolerances, reduces noise and vibration, and improves the overall accuracy and reliability of the system.

[0041] In implementation, before installing the first open spring ring 6, the gap between the inner ring of the bearing 5 and the spring ring is measured, and a thin metal washer (such as a 0.1mm or 0.2mm thick steel sheet) of appropriate thickness is placed between the spring ring and the inner ring of the bearing 5. During installation, the washer is first sleeved on the shaft sleeve of the inner rotating disc 3, and then the spring ring is installed so that the washer is clamped between the spring ring and the inner ring of the bearing 5. The installation process is tried several times: if it is too tight, a thin washer is selected; if it is loose, a thick washer is selected; and then the spring ring is fixed. Those skilled in the art can complete it with conventional measuring tools.

[0042] In this embodiment, the inner ring side of the sleeve 1 is provided with a second open spring ring 8 for limiting the outer end of the shift fork 2.

[0043] The second open spring ring 8 axially limits the shift fork 2, prevents it from coming out or shifting during movement, keeps the input component stable, especially when the shift fork 2 is frequently rotated, and improves the durability and operational reliability of the structure.

[0044] In implementation, a groove (annular groove) is processed on the inner wall of the sleeve 1 near the entrance, and then the second open spring ring 8 is installed. During assembly, the shift fork 2 is first inserted into the sleeve 1 to a set position, and then the spring ring is opened and placed into the groove with a tool (such as tweezers or special pliers), so that it blocks the outer end of the shift fork 2.

[0045] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change, and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A bidirectional anti-reverse structure, characterized in that, The device includes a sleeve, a shift fork, an inner turntable, and a torsion spring. The shift fork, inner turntable, and torsion spring are all inserted inside the sleeve. The insert arms of the shift fork and the inner turntable are inserted into the torsion spring, and the two bent ends of the torsion spring are located on the inner ring side. The two insert arms of the shift fork are respectively supported on the inner sides of the two bent ends. One insert arm of the inner turntable is supported on the outer side of one of the bent ends, and the other insert arm is located on the inner side of the two bent ends and between the two insert arms of the shift fork.

2. A bidirectional anti-reverse structure according to claim 1, characterized in that, Both the waist of the shift fork and the waist of the inner turntable have ring structures, and the two ring structures limit the position of the two end faces of the torsion spring.

3. A bidirectional anti-reverse structure according to claim 1, characterized in that, A bearing is installed between the bushing of the inner turntable and the inner wall of the sleeve.

4. A bidirectional anti-reverse structure according to claim 3, characterized in that, A first open spring ring for limiting the inner ring of the bearing is installed at the outer end of the inner turntable.

5. A bidirectional anti-reverse structure according to claim 4, characterized in that, An adjusting shim is provided between the first open spring ring and the inner ring of the bearing.

6. A bidirectional anti-reverse structure according to claim 1, characterized in that, The inner ring of the sleeve is provided with a second open spring ring for limiting the outer end of the shift fork.

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