Self-locking single-mode spiral rotating shaft unit

Abstract

The invention discloses a self-locking single-mode spiral rotating shaft unit which comprises a top cover, a plurality of coaxial main bodies connected end to end, wheel shafts and rollers, the wheel shafts and the rollers are installed in the main bodies, the top cover and the main bodies are limited through mechanical self-locking wheel shafts, the wheel shafts are inserted into inclined wheel shaft holes of the main bodies, and the wheel shaft holes are blocked by protrusions of the top cover or protrusions at the lower ends of the adjacent main bodies; glue fixing is replaced, and the limiting failure problem is solved; the single-mode main body of the rotating shaft unit is adaptive to any length requirement, so that the number of molds is reduced, and the batch production cost is reduced; and moreover, the top cover and the main body are assembled in a buckling manner, so that the process is simplified.

Description

Technical Field

[0001] This invention relates to the field of omnidirectional treadmill technology, and more particularly to a self-locking single-mode spiral shaft unit with combinable length. Background Technology

[0002] Virtual reality (VR) technology simulates various human sensory signals, such as vision, hearing, touch, and movement, through computers, providing a highly realistic virtual experience. Natural motion interaction technology is one of the key technologies in VR that expands the user's exploration space within the virtual world. Omnidirectional motion platforms based on VR technology are devices that can meet the user's needs for omnidirectional movement, allowing users to achieve virtually unlimited movement within a limited space, such as running, rotating, jumping, squatting, and dodging left and right. Omnidirectional treadmills provide feedback based on the user's position, posture, and movements, thus returning the user to their starting point.

[0003] Chinese patent ZL202210149746.3 discloses an active omnidirectional treadmill based on a spiral roller, which is a highly miniaturized active omnidirectional treadmill with broad prospects for home use. Its core structure lies in a mirror-symmetrical spiral shaft. The spiral shaft carries several tilted and freely rotating rollers, which rotate around the shaft.

[0004] Currently, the spiral shaft is a one-piece design. To accommodate different machine models, different types of spiral shafts need to be designed for different lengths. Furthermore, due to the assembly requirements of the rollers, the axle hole is designed on the surface of the spiral roller, and the axle is inserted from one side of the axle hole. To prevent the axle from coming out of the axle hole during equipment operation, currently, epoxy resin is used to seal the axle hole, thus limiting the axle's position.

[0005] However, the current spiral shaft process has the following problems. First, it requires designing multiple types of spiral shafts for different lengths, resulting in poor flexibility. This necessitates the design of multiple sets of molds and equipment for production and assembly, making mass production difficult. Second, since a single machine has thousands of shafts, using a drip-glue process to limit the shaft movement presents challenges such as difficulty in controlling the glue dosage, low yield of spiral shafts, and failure of the limiting mechanism after glue aging. Summary of the Invention

[0006] Technical problem: In order to overcome the shortcomings of the prior art, the present invention provides a self-locking single-mode spiral shaft unit with a single-mode main body and which can effectively solve the wheel and axle assembly problem.

[0007] Technical solution: This invention discloses a self-locking single-mode spiral shaft unit, including a top cover, several coaxially connected main bodies, and axles and rollers installed in the main bodies;

[0008] The main body includes a front surface, a rear surface opposite to the front surface, and a circumferential surface; the circumferential surface is provided with a groove for receiving a roller, and the main body is provided with axle holes located at both ends of the groove, the bottom of the axle hole abutting the bottom of the axle (20), and the top of the axle hole penetrating the front surface of the main body; the roller is located in the groove and the roller part protrudes from the circumferential surface of the main body; the axle is inserted into the axle hole and passes through the roller;

[0009] The front surface edge of the main body is provided with a groove structure, and the opening of the wheel axle hole through the main body is at least partially located within the groove structure; the rear surface of the main body is provided with a rearward protruding protrusion structure. When the two main bodies are connected end to end, the protrusion structure of the first main body and the groove structure of the second main body cooperate with each other for positioning, and the protrusion structure of the first main body abuts against the wheel axle of the second main body.

[0010] The top cover also has a raised structure, which cooperates with the groove structure of the main body at the front end for positioning.

[0011] Furthermore, the angle between the axial direction of the wheel axle hole and the axial direction of the main body ranges from ±10 degrees to 80 degrees.

[0012] Furthermore, the groove structure has a trapezoidal cross-section, including a bottom parallel to the front surface of the main body and an inner inclined surface sloping from the bottom. The opening of the wheel axle hole through the main body is located on one of the inclined sides. The cross-section of the protrusion structure is also trapezoidal, and the two sides of the protrusion structure are inclined outer inclined surfaces. After the first main body is coaxially connected with the next main body, the outer inclined surface of the protrusion structure of the first main body abuts against the wheel axle of the next main body.

[0013] Furthermore, the outer side of the axle hole protrudes from the circumferential surface of the main body; the outer side of the axle hole is lower than the outer surface of the roller.

[0014] Furthermore, the mating surfaces of two adjacent main bodies are respectively provided with positioning posts and positioning holes.

[0015] Furthermore, both the top cover and the main body have through holes in their center, and a keyway is provided on one side of the through hole. When the top cover and the main body are connected axially in sequence, the top cover and the main body are coaxially fixedly connected by passing through the through hole and the keyway with a splined shaft.

[0016] Furthermore, each main body is equipped with at least two rollers.

[0017] Furthermore, it also includes a bottom cover, which is also provided with a groove structure. The groove structure of the bottom cover cooperates with the protruding structure of the main body at the rear end for positioning.

[0018] Furthermore, the upper end of the top cover and the lower end of the bottom cover are both provided with a gasket structure surrounding the through hole.

[0019] Furthermore, both the top cover and the bottom cover are provided with positioning posts or positioning holes.

[0020] Beneficial effects:

[0021] 1. This invention decomposes the function of the spiral shaft, extracts the main structure of a single mode, and can be combined into a spiral shaft of arbitrary length, thereby improving the flexibility of equipment design.

[0022] 2. The single-modal main structure reduces the need for multiple sets of molds, improves production efficiency, and reduces mold manufacturing costs.

[0023] 3. By using mechanical limiters, the reliance on glue in the wheel and axle assembly process was eliminated, the yield rate of the spiral shaft was improved, and the problem of wheel and axle limiter failure was solved. Attached Figure Description

[0024] Figure 1 This is a perspective view of the main body of the present invention;

[0025] Figure 2 This is a perspective view of the main body of the present invention from another angle;

[0026] Figure 3 This is a perspective view of the roller and axle in this invention;

[0027] Figure 4 This is a schematic diagram of the assembly of the main body, rollers, and axle, with the axle and the main body at a 45-degree angle.

[0028] Figure 5 This is a schematic diagram of the assembly of the main body, rollers, and axle, with the axle and the main body at an angle of -45 degrees.

[0029] Figure 6 This is a perspective view of the top cover in this invention;

[0030] Figure 7 This is a perspective view of the top cover from another angle in this invention;

[0031] Figure 8 This is a perspective view of the bottom cover in this invention;

[0032] Figure 9 This is a perspective view of the bottom cover from another angle in this invention;

[0033] Figure 10 This is a schematic diagram of the assembly of the spiral shaft unit with two main bodies in this invention.

[0034] Figure 11 This is a schematic diagram from another angle showing the assembly of the spiral shaft unit with two main bodies in this invention;

[0035] Figure 12This is a perspective view of the assembled spiral shaft unit with two main bodies in this invention.

[0036] Figure 13 This is a perspective view of the spiral shaft unit after the bottom cover has been removed and assembled in this invention;

[0037] Figure 14 This is a perspective view of the assembled spiral shaft unit with three main bodies in this invention, with the wheel axle and the main body direction forming an angle of 45 degrees.

[0038] Figure 15 This is a perspective view of the assembled spiral shaft unit with three main bodies in this invention, with the wheel axle and the main body direction forming an angle of -45 degrees.

[0039] Figure 16 This is a perspective view of the top cover structure without additional gaskets in this invention;

[0040] Figure 17 This is a perspective view of the bottom cover structure without added gaskets in this invention;

[0041] Figure 18 To be Figure 12 Replace the top and bottom covers with Figure 16 The top cover and Figure 17 A three-dimensional view of the bottom cover. Detailed Implementation

[0042] The present invention provides a self-locking single-mode spiral shaft unit with combinable length. The shaft unit includes a top cover 40, several coaxially connected main bodies 10, a wheel axle 20 and a roller 30 installed in the main bodies 10, and a bottom cover 50 can be optionally added to the shaft unit.

[0043] Figure 1 The structure of the main body 10 of the present invention is shown. The main body 10 includes a front surface, a rear surface opposite to the front surface, and a circumferential surface; the circumferential surface is provided with a wheel groove 1002 for receiving a roller 30, and the main body 10 has wheel axle holes 1001 located at both ends of the wheel groove 1002. The bottom of the wheel axle hole 1001 abuts against the bottom of the wheel axle 20. In this embodiment, the bottom of the wheel axle hole 1001 is a blind hole to abut against the bottom of the wheel axle 20. The bottom of the wheel axle hole 1001 can also be selected as a wheel axle mounting hole as shown in Chinese Patent ZL202210149746.3. Although it penetrates the main body, the diameter of the wheel axle mounting hole is smaller than the diameter of the wheel axle, so it can still abut against the bottom of the wheel axle. The top of the wheel axle hole 1001 penetrates the front surface of the main body 10. The roller 30 is located in the wheel groove 1002 and the roller 30 partially protrudes from the circumferential surface of the main body 10. Figure 3 and Figure 4As shown, the axle 20 is inserted into the axle hole 1001 and passes through the roller 30. The outer side of the axle hole 1001 protrudes from the circumferential surface of the body 10; the outer side of the axle hole 1001 is lower than the outer surface of the roller 30.

[0044] like Figure 1 and Figure 2 As shown, the front surface edge of the main body 10 has a groove structure 1003, and the top of the axle hole 1001, through the opening of the main body 10, is at least partially located within the groove structure 1003. The rear surface of the main body 10 has a rearwardly protruding protrusion structure 1004. (Combined) Figures 10 to 13 As shown, when two main bodies 10 are connected end to end, the protruding structure 1004 of the first main body and the grooved structure 1003 of the second main body cooperate to position each other, and the protruding structure 1004 of the first main body 10 abuts against the axle 20 of the second main body 10. In this embodiment, the grooved structure 1003 has a trapezoidal cross-section, including a bottom parallel to the front surface of the main body 10 and an inner inclined surface sloping from the bottom. The top of the axle hole 1001, through the opening of the main body 10, is located on one of the inclined sides. The protruding structure 1004 also has a trapezoidal cross-section, and the two sides of the protruding structure 1004 are inclined outer inclined surfaces. After the first main body and the second main body are coaxially connected, the outer inclined surface of the protruding structure 1004 of the first main body abuts against the axle 20 of the second main body, thereby realizing mechanical positioning between adjacent main bodies 10, enabling several main bodies 10 to be coaxially connected, and changing the length of the overall rotating shaft unit by changing the number of main bodies 10. For example, Figure 12 An embodiment of two rotating shaft units with a length of 10 is shown. Figure 14 , Figure 15 An embodiment of a rotating shaft unit with a length of 10 is shown.

[0045] like Figures 1 to 5 As shown, a circular through hole 1005 and a keyway 1006 are provided at the center of the main body 10. To enhance the connection strength, a positioning hole 1011 is provided at the upper end of the main body 10 and a positioning post 1012 is provided at the lower end of the main body 10. It should be noted that the positioning hole 1011 and positioning post 1012 may not be provided, and the splicing and assembly effect can be achieved simply by using the groove structure 1003 and the protrusion structure 1004. Alternatively, in other embodiments, a positioning post may be provided at the upper end of the main body 10 and a positioning hole may be provided at the lower end; or, in other embodiments, several positioning posts and several positioning holes may be provided at the upper end of the main body 10, and several positioning posts and several positioning holes may also be provided at the lower end of the main body 10, and when the two main bodies 10 are joined, each positioning post and each positioning hole are inserted into each other in a one-to-one manner.

[0046] In this embodiment, four rollers are evenly distributed on a main body. In actual use, at least two rollers can be evenly arranged at an angle.

[0047] When assembling the roller 30, the roller 30 is placed in the wheel groove 1002, and the wheel axle 20 is inserted through the wheel axle hole 1001. The angle between the wheel axle hole direction 2001 and the main body axis 2002 is any angle from ±10 degrees to 80 degrees. In this invention, 45 degrees and -45 degrees are used as the preferred embodiments. Figure 4 The angle between the direction of the central wheel shaft hole 2001 and the axis of the main body 2002 is 45 degrees. Figure 5 The angle between the direction of the central wheel shaft hole 2001 and the axis of the main body 2002 is -45 degrees.

[0048] like Figure 6 and Figure 7 As shown, the top cover 40 also has a protruding structure 4001. The protruding structure 4001 of the top cover 40 cooperates with the groove structure 1003 of the frontmost main body 10 for positioning, thereby sealing the wheel axle hole 1001 of the frontmost main body 10. And combined with... Figure 13 The top cover 40 and several main bodies 10, forming a rotating shaft unit, are combined together via a rotating shaft (not shown) to create the spiral rotating shaft structure required in the prior art. This structure is fixed by mechanical limiting assembly, eliminating the reliance on adhesive in the wheel and axle assembly process. Furthermore, each main body 10, including its wheel and axle 20 and roller 30, has an identical structure, reducing the need for multiple sets of molds, improving production efficiency, and lowering mold manufacturing costs.

[0049] like Figure 8 and Figure 9 As shown, a bottom cover 50 can also be optionally provided in this rotating shaft unit. The bottom cover 50 also has a groove structure 5001, which cooperates with the protrusion structure 1004 of the main body 10 at the rear end for positioning. The bottom cover 50 also has positioning holes 5012 for cooperating with the positioning pins 1012 of the main body 10. It should be noted that the groove structure on the bottom cover 50 does not serve as a limiting structure; it only maintains the flatness of both ends of the entire spiral shaft. The bottom cover 50 can be omitted depending on the actual situation. For example, this implementation... Figure 13 As shown. The positioning holes and positioning posts on the main body 10, top cover 40 and bottom cover 50 are not necessary structures and can be optionally provided when an additional positioning mechanism is required.

[0050] The upper end of the top cover 40 and the lower end of the bottom cover 50 can be equipped with or without a gasket structure. For example... Figure 6 and Figure 8 As shown, the upper end of the top cover 40 is provided with a gasket structure 4011 surrounding the through hole, and the lower end of the bottom cover is provided with a gasket structure 5011 surrounding the through hole. Figure 16 and Figure 17 The top cover 40 and bottom cover 50 with gasket-less structures are shown respectively. Figure 18 The structure of the top cover 40 and bottom cover 50 without gaskets after being installed with the main body 10 is shown.

[0051] The above embodiments are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and equivalent substitutions without departing from the principle of the present invention. All such improvements and equivalent substitutions to the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A self-locking single-mode helical shaft unit, characterized in that: It includes a top cover (40), several coaxially connected main bodies (10), wheel axles (20) and rollers (30) installed in the main bodies (10); The main body (10) includes a front surface, a rear surface opposite to the front surface, and a circumferential surface; the circumferential surface is provided with a wheel groove (1002) for receiving a roller (30), and the main body (10) is provided with axle holes (1001) located at both ends of the wheel groove (1002), the bottom of the axle hole abuts against the bottom of the axle (20), and the top of the axle hole penetrates through the front surface of the main body (10); the roller (30) is located in the wheel groove (1002) and the roller (30) partially protrudes from the circumferential surface of the main body (10); the axle (20) is inserted into the axle hole (1001) and passes through the roller (30); The front surface edge of the main body (10) is provided with a groove structure (1003), and the top of the wheel axle hole (1001) penetrates the opening of the main body (10) and is at least partially located within the groove structure (1003); the rear surface of the main body (10) is provided with a rearward protruding protrusion structure (1004). When the two main bodies (10) are connected end to end, the protrusion structure (1004) of the first main body and the groove structure (1003) of the second main body cooperate with each other for positioning, and the protrusion structure (1004) of the first main body (10) abuts against the wheel axle (20) of the second main body (10). The top cover (40) is also provided with a protruding structure (4001), and the protruding structure (4001) of the top cover (40) and the groove structure (1003) of the frontmost main body (10) are positioned in cooperation with each other.

2. The self-locking single-mode spiral shaft unit according to claim 1, characterized in that: The angle between the axial direction of the wheel axle hole (1001) and the axial direction of the main body (10) is ±10 degrees to 80 degrees.

3. The self-locking single-mode spiral shaft unit according to claim 2, characterized in that: The groove structure (1003) has a trapezoidal cross section, including a bottom parallel to the front surface of the main body (10) and an inner inclined surface sloping from the bottom. The top of the wheel axle hole (1001) has an opening through the main body (10) located on one of the inclined sides. The protrusion structure (1004) also has a trapezoidal cross section, and the two sides of the protrusion structure (1004) are inclined outer inclined surfaces. After the first main body is coaxially connected with the second main body, the outer inclined surface of the protrusion structure (1004) of the first main body abuts against the wheel axle (20) of the second main body.

4. The self-locking single-mode spiral shaft unit according to claim 3, characterized in that: The outer side of the axle hole (1001) protrudes from the circumferential surface of the main body (10); the outer side of the axle hole (1001) is lower than the outer surface of the roller (30).

5. The self-locking single-mode spiral shaft unit according to claim 1, characterized in that: The mating surfaces of two adjacent main bodies are respectively provided with positioning posts (1012) and positioning holes (1011).

6. The self-locking single-mode spiral shaft unit according to claim 1, characterized in that: Both the top cover (40) and the main body (10) have through holes (1005) in the center. A keyway (1006) is also provided on one side of the through hole (1005). When the top cover and the main body are connected axially in sequence, the top cover (40) and the main body (10) are coaxially fixedly connected by passing a spline shaft through the through hole (1005) and the keyway (1006).

7. The self-locking single-mode spiral shaft unit according to claim 1, characterized in that: Each body (10) is equipped with at least two rollers.

8. The self-locking single-mode spiral shaft unit according to claim 6, characterized in that: It also includes a bottom cover (50), which is also provided with a groove structure (5001). The groove structure (5001) of the bottom cover (50) and the protrusion structure (1004) of the main body (10) at the rear end cooperate with each other for positioning.

9. The self-locking single-mode spiral shaft unit according to claim 8, characterized in that: The upper end of the top cover and the lower end of the bottom cover are both provided with a gasket structure surrounding the through hole.

10. The self-locking single-mode spiral shaft unit according to claim 9, characterized in that: Both the top cover and the bottom cover are provided with positioning pins or positioning holes.

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