Self-centering crown structure

Abstract

The utility model discloses a self-centering crown structure which comprises a crown shaft, the crown shaft comprises a first shaft section and a second shaft section which are coaxially arranged, the first shaft section is sleeved with a sealing ring, one end of the first shaft section is arranged in one end of a socket sleeve in a sliding mode, one end of the first shaft section is detachably connected to one end of the second shaft section, and the other end of the first shaft section is detachably connected to the socket sleeve. An annular plate is formed at the other end of the socket sleeve, an inner annular hole of the annular plate and the socket sleeve are coaxially arranged, the inner diameter size of the inner annular hole is gradually increased, the outer portion of the second coupling is coaxially connected with a circular truncated cone ring, the circular truncated cone ring is arranged in the inner annular hole in a sliding mode, and the cone angle of the circular truncated cone ring is matched with the cone angle of the inner annular hole. The outer diameter of the bottom end of the circular truncated cone ring is larger than the inner diameter of the other end of the inner ring hole, and the other end of the second coupling is elastically installed on the dial plate. And the other end of the first shaft joint extends out of the dial plate and is connected to the crown body. According to the utility model, the problem that the crown of the existing intelligent watch is easy to be eccentric is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a watch technical field, concretely relates to a self-centering crown structure. BACKGROUND

[0002] In addition to providing time information, smart watches are also used to receive messages, answer phone calls or measure physiological signals. Regardless of how updated the applications are, it is common to use the crown on the watch to adjust the watch.

[0003] The crown structure of the existing smart watch (as shown in Figure 1 and Figure 2 ) only relies on the O-ring a to position the shaft, and there is a gap between the sleeve b and the crown shaft c. If the user only uses a single finger to rotate the crown d, the crown shaft c will be eccentric.

[0004] According to the design specifications of the sensor, the angular displacement of the crown shaft is only allowed to be within ±3 degrees. However, the manufacturing tolerance of the shaft, assembly error and the reserved assembly gap can all cause the crown shaft to be eccentric.

[0005] When the crown is eccentric, the accuracy of the watch operation is affected, and each time the crown is rotated, unstable situations occur, making it difficult to determine whether the problem comes from the sensor or the crown itself. From a production perspective, each watch may have different degrees of eccentricity during the manufacturing process, which affects the repeatability and reproducibility, and further affects the consistency and reliability of the product.

[0006] The information disclosed in this background section is intended only to increase an understanding of the general context of the present utility model, and should not be taken as an acknowledgement or implication that this information forms prior art that is already widely known in the art. SUMMARY

[0007] To overcome the defects of the prior art, a self-centering crown structure is provided to solve the problem of the existing smart watch crown being prone to eccentricity.

[0008] To achieve the above-mentioned purpose, a self-centering crown structure is provided, comprising:

[0009] A through hole is formed in the side of the watch dial, and a socket sleeve is inserted into the through hole. The self-centering crown structure comprises:

[0010] The cam is connected to the second end of the first shaft by a toothed connection, and the toothed connection is connected to the first end of the first shaft by a toothed connection.

[0011] The other end of the first shaft section extends to the outside of the dial and is connected to the crown body.

[0012] Furthermore, a threaded hole is formed at one end of the first shaft section, a thread is formed on the outside of one end of the second shaft section, and one end of the second shaft section is screwed into the threaded hole.

[0013] Furthermore, there are multiple sealing rings, and the multiple sealing rings are arranged at intervals along the length direction of the first shaft section.

[0014] Furthermore, an accommodating ring groove is formed on the outer wall of the first shaft joint, the inner side of the sealing ring is embedded in the accommodating ring groove, and the outer side of the sealing ring abuts against the inner wall of the socket sleeve.

[0015] Furthermore, the cone angle of the truncated cone ring is less than 45°.

[0016] The beneficial effect of the present invention is that the self-centering crown structure of the present invention, through the cooperation of the side of the conical ring on the split crown shaft with the inner ring hole of the ring plate of the socket sleeve in the dial and the design of the pre-push elastic force of the crown shaft, enables the crown structure to automatically center, ensuring that the crown can automatically return to the correct position after being released, thereby improving the operating accuracy and user experience.

[0017] The self-centering crown structure of the utility model adopts a detachable assembly design for the first shaft section and the second shaft section of the split crown shaft, making the assembly and disassembly of the crown and the crown shaft easier and reducing production and maintenance costs.

[0018] The fit between the truncated cone ring and the inner ring hole in the self-centering crown structure of the present invention requires lower tolerance accuracy than the traditional shaft-hole fit and is easier to manufacture. The socket sleeve can also be a partial structure of the dial and should not be limited to this example. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 It is a structural diagram of an existing watch crown structure.

[0021] Figure 2 It is a cross-sectional view of an existing watch crown structure.

[0022] Figure 3 Schematic diagram of the exploded structure of the self-centering crown structure of an embodiment of the present utility model.

[0023] Figure 4 This is a cross-sectional view of the self-centering crown structure of an embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the self-centering crown structure in the pressed state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Reference Figures 3 to 5 As shown, the utility model provides a self-centering crown structure, including: a crown shaft and a crown body 2.

[0028] In this embodiment, a through hole is formed on the side of the dial 3 of the watch, and a socket sleeve 31 is passed through the through hole.

[0029] The crown shaft adopts a split crown shaft. Specifically, the crown shaft includes a first shaft section 11 and a second shaft section 12. The first shaft section 11 and the second shaft section 12 are coaxially arranged.

[0030] The first shaft section 11 is provided with a sealing ring 13 on its outer surface. One end of the first shaft section 11 is slidably disposed in one end of the socket sleeve 31 .

[0031] As a preferred embodiment, there are multiple sealing rings 13 , which are spaced apart along the length direction of the first shaft section 11 .

[0032] In the present embodiment, the outer wall of the first arbor 11 is formed with a receiving groove. The receiving groove has a groove depth less than the thickness of the sealing ring. The inner side of the sealing ring 13 is fitted in the receiving groove. The outer side of the sealing ring 13 abuts against the inner wall of the socket sleeve 31.

[0033] One end of the first arbor 11 is detachably connected to one end of the second arbor 12.

[0034] As a preferred embodiment, one end of the first arbor 11 is formed with a threaded hole. The outer part of one end of the second arbor 12 is formed with threads. One end of the second arbor 12 is screwed into the threaded hole.

[0035] The other end of the socket sleeve 31 is formed with a ring plate 32. The inner ring hole 320 of the ring plate 32 is coaxially arranged with the socket sleeve 31. The inner diameter of the inner ring hole 320 gradually increases from the end of the through hole facing the first arbor 11 to the other end of the through hole facing away from the first arbor 11. The outer part of the second arbor 12 is coaxially connected with a circular truncated cone ring 14. The circular truncated cone ring 14 is slidably arranged in the inner ring hole 320. The angle of the conical angle of the circular truncated cone ring 14 is adapted to the angle of the conical angle of the inner ring hole 320.

[0036] The outer diameter of the bottom end of the circular truncated cone ring 14 is greater than the inner diameter of the other end of the inner ring hole 320. The other end of the second arbor 12 is elastically mounted to the dial 3 so that the side surface 140 of the circular truncated cone ring 14 is pressed against the hole wall of the inner ring hole 320.

[0037] The other end of the first arbor 11 extends to the outside of the dial 3, and the other end of the first arbor 11 is connected to the crown body 2.

[0038] In the present embodiment, the crown is operated by the user.

[0039] The crown shaft connects the crown and the internal mechanism of the dial. The internal mechanism applies a pre-push elastic force to the crown shaft, prompting the crown shaft to rebound to the initial position.

[0040] The socket sleeve is fixed to the dial, and the dial does not participate in the self-centering function in the pressed or unpressed state of the crown.

[0041] The circular truncated cone ring is located between the crown shaft and the socket sleeve, cooperates with the ring plate of the socket sleeve, and provides the self-centering function.

[0042] The sealing ring provides waterproof effect for the watch and provides a small centering ability when pressed.

[0043] The self-centering crown structure of the present invention redesigns the existing integrated structure of the crown and shaft and splits the crown and the crown shaft into two parts. The first shaft section and the second shaft section of the crown shaft are locked by screw threads, and the first shaft section is fixed to the crown; the socket sleeve is fixed in the through-hole of the watch dial; the frustum ring and the sleeve on the crown shaft increase the tapered surface, and the side surface of the frustum ring contacts the hole wall of the inner ring hole of the ring plate of the socket sleeve; the sealing ring provides a waterproof effect and provides a slight centering ability when pressed.

[0044] This new self-centering crown structure utilizes the side surfaces of the truncated cone ring and a pre-loaded spring to achieve the crown's self-centering function. Whether the crown is pressed or not, the watch dial does not participate in the crown's self-centering function. The side surfaces of the truncated cone ring contribute more to the self-centering effect than the pre-loaded spring.

[0045] See Figure 5 As shown, when the crown is pressed, the frustum ring on the crown shaft separates from the wall of the inner ring hole of the ring plate of the socket sleeve. At this time, the tapered surface loses its function. The principle is the same as when there is no angle, and the sealing ring is used to provide a small centering force.

[0046] When the crown of a watch is pressed, the crown and the crown shaft move in tandem in the direction of the pressure (i.e., toward the inside of the dial). During this process, the crown shaft and the inner ring hole wall of the tapered socket ring plate do not contact each other and remain separated. At this time, the crown and crown shaft operate in the same manner as when the crown is not angled, with the sealing ring providing a slight centering force.

[0047] See Figure 4 As shown in the figure, when the crown is released, the pre-pressing spring forces the crown and crown shaft to move in the direction opposite to the pressing action (i.e., toward the outside of the dial). At this point, because the inner hole of the ring plate of the socket sleeve has a tapered surface, the tapered surface of the side of the frustum ring on the crown shaft contacts the tapered surface of the inner hole. Combined with the pre-pressing spring, a force is applied toward the crown, thus achieving self-centering.

[0048] The geometry of the side faces (i.e., the tapered faces) of the frustum rings makes them self-centering. When two tapered faces come into contact, even with slight misalignment, the contact force automatically adjusts to align and center the two surfaces. This feature makes the tapered faces ideal for tool holding and other applications requiring precise alignment.

[0049] As a preferred embodiment, the cone angle of the frustum ring 14 is less than 45°.

[0050] Set the angle θ between the tapered surface and the axis to form the cone angle. When the pre-thrust spring contacts the tapered surface, it will split into two forces: force A, which is parallel to the tapered surface and toward the axis, and force B, which is perpendicular to the tapered surface. The force component formula is: pre-thrust spring force × cosθ = force component A, pre-thrust spring force × sinθ = force component B.

[0051] When the angle θ tends to 0 degree from 45 degrees, the pre-push elastic force x cos θ = A component force increases, and the centering ability is stronger.

[0052] When the angle θ tends to 90 degrees from 45 degrees, the pre-push elastic force x cos θ = A component force decreases, and the centering ability is worse.

[0053] When the conical angle is less than 45 degrees, this angle usually requires a larger force to separate the two contact surfaces, because the smaller the angle, the stronger the self-locking effect. This design is suitable for applications that require high stability and high load, and can provide strong self-centering effect and high precision centering. This scheme is used in the case.

[0054] When the conical angle is greater than 45 degrees, this angle requires a smaller force to separate, because the larger the angle, the easier the separation. This design is suitable for applications that require fast release and low load, and can also provide good self-centering effect, but may have slightly lower precision under high load.

[0055] The self-centering crown structure of the utility model, through the cooperation of the side surface of the circular table ring on the split type crown shaft and the inner ring hole of the ring plate of the socket sleeve in the dial and the design of the pre-push elastic force of the crown shaft, the crown structure can be automatically centered, ensuring that the crown can automatically return to the correct position after being released, thereby improving the operation precision and use experience.

[0056] The self-centering crown structure of the utility model, the first shaft joint and the second shaft joint of the split type crown shaft adopt the design of screw thread matching lock, so that the assembly and disassembly of the crown and the crown shaft are easier, and the production and maintenance costs are reduced.

[0057] The cooperation of the circular table ring and the inner ring hole in the self-centering crown structure of the utility model has lower tolerance accuracy than the conventional shaft hole cooperation, and is easier to manufacture.

[0058] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. Those skilled in the art should understand that the utility model range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the utility model concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form technical solutions.

Claims

1. A self-centering crown structure, characterized in that: A through-hole is provided on the side of the dial of the watch, a socket sleeve is passed through the through-hole, and the self-centering crown structure includes: The cam is connected to the second end of the first shaft by a toothed connection, and the toothed connection is connected to the cam by a toothed connection. The other end of the first shaft section extends to the outside of the dial and is connected to the crown body.

2. The self-centering crown structure according to claim 1, characterized in that: A threaded hole is formed at one end of the first shaft section, a thread is formed on the outside of one end of the second shaft section, and one end of the second shaft section is screwed into the threaded hole.

3. The self-centering crown structure according to claim 1, characterized in that: There are multiple sealing rings, and the multiple sealing rings are arranged at intervals along the length direction of the first shaft section.

4. The self-centering crown structure according to claim 3, characterized in that: An accommodating ring groove is formed on the outer wall of the first shaft section, the inner side of the sealing ring is embedded in the accommodating ring groove, and the outer side of the sealing ring abuts against the inner wall of the socket sleeve.

5. The self-centering crown structure according to claim 1, characterized in that: The cone angle of the truncated cone ring is less than 45°.

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