Clock fork shaft with positioning shoulder

Abstract

The utility model provides a clock fork shaft with a positioning shoulder, which belongs to the technical field of precise timing instruments and comprises a shell, a fork tile and an escape wheel are movably mounted on the inner side of the shell, and a positioning shoulder component is arranged on the inner side of the shell. The positioning shoulder assembly comprises a shaft body, a positioning shoulder, an upper shaft neck, a conical transition face, a lower shaft neck, a guide conical face, an annular positioning face and anti-rotation grooves, the positioning shoulder assembly is arranged to be matched with the upper shaft neck and the lower shaft neck of the specific size, accurate positioning of the fork tile in the escapement mechanism is achieved, the two anti-rotation grooves are symmetrically machined in the positioning shoulder, and therefore the fork tile can be accurately positioned in the escapement mechanism. The positioning shoulder is matched with the protrusion on the fork tile, work stability is effectively enhanced, the positioning shoulder can avoid circumferential displacement through the anti-rotation groove, stress concentration of the fork tile can be reduced by arranging the guide conical face to be matched with the conical transition face, the timing precision of the clock can be improved through the design, the service life can be prolonged, and the service life of the clock can be prolonged by optimizing the structure of the positioning shoulder. And the machining difficulty is reduced while the positioning precision is ensured.

Description

Technical Field

[0001] This utility model relates to the field of precision timing instruments, and in particular to a watch fork shaft with a positioning shoulder. Background Technology

[0002] "Watch fork pivot" usually refers to a key component in a watch movement, especially in mechanical watches, where it plays an important role. The fork pivot is part of the escapement mechanism and is connected to the escape fork. Its main function is to convert the oscillation of the balance wheel into the intermittent motion of the gear train, thereby controlling the release of energy and ensuring the accuracy of the watch's timekeeping.

[0003] Traditional watch fork shafts suffer from inaccurate axial positioning, leading to deviations when the escape wheel and fork plates engage. Existing technologies use shims or threaded locking methods, which have drawbacks such as complex assembly and easy loosening.

[0004] Therefore, this application provides a watch fork shaft with a positioning shoulder to meet the requirements. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the background art mentioned above, and to propose a watch fork shaft with a positioning shoulder.

[0006] The technical problem to be solved by this utility model is to provide a watch fork shaft with a positioning shoulder to solve the problems of existing watch fork shafts with positioning shoulders.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] The housing has a fork and an escape wheel movably mounted on its inner side, and a positioning shoulder assembly is provided on the inner side of the housing.

[0009] The positioning shoulder assembly includes a shaft, a positioning shoulder, an upper journal, a tapered transition surface, a lower journal, a guide tapered surface, an annular positioning surface, and an anti-rotation groove;

[0010] The shaft is disposed on the inner side of the housing, the positioning shoulder is integrally formed on the surface of the positioning shoulder, the upper journal and the lower journal are respectively located on both sides of the positioning shoulder, the tapered transition surface is disposed on the outer wall of the shaft, the guide cone surface is disposed on the support rod surface of the lower journal, the annular positioning surface is disposed on one side of the positioning shoulder, and the anti-rotation groove is formed on the surface of the positioning shoulder.

[0011] Preferably, the outer diameter of the upper journal and the lower journal is smaller than the outer diameter of the positioning shoulder.

[0012] Preferably, the number of anti-rotation grooves is two, and they are arranged symmetrically.

[0013] Preferably, the anti-rotation groove engages with the protrusion on the escapement plate of the escape wheel, and the anti-rotation groove is used to prevent the pallet from easily wobbling.

[0014] Preferably, the outer wall surface of the guide cone surface matches the outer wall surface of the cone transition surface.

[0015] Preferably, the outer wall surface of the upper journal matches the outer wall surface of the annular positioning surface.

[0016] Preferably, the tapered transition surface cooperates with the guide tapered surface to reduce stress concentration in the fork bearing.

[0017] Compared with the prior art, this utility model has at least the following beneficial effects:

[0018] In the above solution, by setting a positioning shoulder assembly, the upper and lower journals of specific dimensions are matched to achieve precise positioning of the pallet fork in the escapement mechanism. Furthermore, by symmetrically machining two anti-rotation grooves on the positioning shoulder, which cooperate with the protrusions on the pallet fork, the pallet fork is prevented from easily wobbling, effectively enhancing working stability. In addition, the positioning shoulder can avoid circumferential displacement through the anti-rotation grooves, and by setting a guide cone surface and a cone-shaped transition surface to cooperate, the stress concentration of the pallet fork can be reduced. This design can improve the timekeeping accuracy of the watch and extend its service life. Thus, by optimizing the positioning shoulder structure, the machining difficulty is reduced while ensuring positioning accuracy. Attached Figure Description

[0019] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a side view of the structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the overall structure of the positioning shoulder assembly in this utility model;

[0023] Figure 4 This is a top view of the positioning shoulder assembly in this utility model;

[0024] Figure 5 This is a bottom view of the positioning shoulder assembly in this utility model.

[0025] [Figure Labels]

[0026] 1. Housing; 2. Pallet; 3. Escape wheel; 4. Positioning shoulder assembly; 401. Shaft; 402. Positioning shoulder; 403. Upper journal; 404. Tapered transition surface; 405. Lower journal; 406. Guide cone surface; 407. Annular positioning surface; 408. Anti-rotation groove.

[0027] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiment of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention provides a watch fork shaft with a positioning shoulder, which includes a housing 1, a fork bearing 2 and an escapement wheel 3 movably mounted on the inner side of the housing 1, and a positioning shoulder assembly 4 provided on the inner side of the housing 1.

[0031] The positioning shoulder assembly 4 includes a shaft body 401, a positioning shoulder 402, an upper journal 403, a tapered transition surface 404, a lower journal 405, a guide tapered surface 406, an annular positioning surface 407, and an anti-rotation groove 408;

[0032] The shaft body 401 is disposed on the inner side of the housing 1. The positioning shoulder 402 is integrally formed on the surface of the positioning shoulder 402. The upper journal 403 and the lower journal 405 are respectively located on both sides of the positioning shoulder 402. The tapered transition surface 404 is disposed on the outer wall of the shaft body 401. The guide tapered surface 406 is disposed on the support rod part surface of the lower journal 405. The annular positioning surface 407 is disposed on one side of the positioning shoulder 402. The anti-rotation groove 408 is formed on the surface of the positioning shoulder 402.

[0033] Working principle: By setting a positioning shoulder 402 with an annular positioning surface 407 and a tapered transition surface 404 in the middle of the shaft body 401, and cooperating with the upper journal 403 and lower journal 405 of specific dimensions, the fork 2 is accurately positioned in the escapement mechanism. Since the upper journal 403 and lower journal 405 are located on both sides of the positioning shoulder 402, the stability of the positioning shoulder 402 is effectively improved. Furthermore, by symmetrically machining two anti-rotation grooves 408 on the positioning shoulder 402, they engage with the protrusions on the fork 2. To prevent the fork bearing 2 from easily shaking and effectively enhance working stability, the positioning shoulder 402 can avoid circumferential displacement through the anti-rotation groove 408. Furthermore, by setting the guide cone surface 406, the optimized structure of the end of the lower journal 405 effectively improves the assembly yield. The tapered transition surface 404 and the guide cone surface 406 can reduce stress concentration in the fork bearing 2. This design can improve the timekeeping accuracy of the watch and extend its service life. Thus, by optimizing the structure of the positioning shoulder 402, the machining difficulty is reduced while ensuring positioning accuracy.

[0034] In this embodiment, as Figures 1-5 As shown, the outer diameters of the upper journal 403 and the lower journal 405 are smaller than the outer diameter of the positioning shoulder 402. Since the upper journal 403 and the lower journal 405 are located on both sides of the positioning shoulder 402, the stability of the positioning shoulder 402 is effectively improved.

[0035] In this embodiment, as Figures 1-5 As shown, there are two anti-rotation grooves 408, which are symmetrically arranged. By symmetrically machining two anti-rotation grooves 408 on the positioning shoulder 402, they can fit with the protrusion on the fork 2.

[0036] In this embodiment, as Figures 1-5 As shown, the anti-rotation groove 408 cooperates with the protrusion on the escapement plate of the escape wheel 3, and the anti-rotation groove 408 is used to prevent the pallet 2 from easily shaking. By symmetrically machining two anti-rotation grooves 408 on the positioning shoulder 402, so that they cooperate with the protrusion on the pallet 2, the pallet 2 is prevented from easily shaking, effectively enhancing the working stability. In addition, the positioning shoulder 402 can avoid circumferential displacement through the anti-rotation groove 408.

[0037] In this embodiment, as Figures 1-5As shown, the outer wall surface of the guide cone surface 406 matches the outer wall surface of the cone transition surface 404. By setting the guide cone surface 406, the optimized structure of the end of the lower journal 405 effectively improves the assembly yield.

[0038] In this embodiment, as Figures 1-5 As shown, the outer wall surface of the upper journal 403 matches the outer wall surface of the annular positioning surface 407. By setting a positioning shoulder 402 with an annular positioning surface 407 and a tapered transition surface 404 in the middle of the shaft body 401, and cooperating with the upper journal 403 and lower journal 405 of specific dimensions, the precise positioning of the fork 2 in the escapement mechanism is achieved.

[0039] In this embodiment, as Figures 1-5 As shown, the tapered transition surface 404 and the guide tapered surface 406 cooperate to reduce the stress concentration of the fork 2. The cooperation between the tapered transition surface 404 and the guide tapered surface 406 can reduce the stress concentration of the fork 2. This design can improve the timekeeping accuracy of the watch and extend its service life. Thus, by optimizing the structure of the positioning shoulder 402, the machining difficulty can be reduced while ensuring the positioning accuracy.

[0040] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A watch fork pivot with a positioning shoulder, characterized in that, include: The outer casing (1) has a fork (2) and an escape wheel (3) movably mounted on its inner side, and a positioning shoulder assembly (4) is provided on the inner side of the outer casing (1). The positioning shoulder assembly (4) includes a shaft (401), a positioning shoulder (402), an upper journal (403), a tapered transition surface (404), a lower journal (405), a guide cone surface (406), an annular positioning surface (407), and an anti-rotation groove (408). The shaft (401) is disposed on the inner side of the outer shell (1), the positioning shoulder (402) is integrally formed on the surface of the positioning shoulder (402), the upper journal (403) and the lower journal (405) are respectively located on both sides of the positioning shoulder (402), the tapered transition surface (404) is disposed on the outer wall of the shaft (401), the guide cone surface (406) is disposed on the support rod surface of the lower journal (405), the annular positioning surface (407) is disposed on one side of the positioning shoulder (402), and the anti-rotation groove (408) is opened on the surface of the positioning shoulder (402).

2. The watch fork shaft with positioning shoulder according to claim 1, characterized in that: The outer diameter of the upper journal (403) and the lower journal (405) is smaller than the outer diameter of the positioning shoulder (402).

3. The watch fork shaft with positioning shoulder according to claim 1, characterized in that: The number of the anti-rotation grooves (408) is two, and they are arranged symmetrically.

4. The watch fork shaft with a positioning shoulder according to claim 1, characterized in that: The anti-rotation groove (408) engages with the protrusion on the escapement plate of the escape wheel (3), and the anti-rotation groove (408) is used to prevent the fork (2) from shaking.

5. The watch fork shaft with a positioning shoulder according to claim 1, characterized in that: The outer wall surface of the guide cone (406) matches the outer wall surface of the cone transition surface (404).

6. The watch fork shaft with a positioning shoulder according to claim 1, characterized in that: The outer wall surface of the upper journal (403) matches the outer wall surface of the annular positioning surface (407).

7. The watch fork shaft with a positioning shoulder according to claim 1, characterized in that: The tapered transition surface (404) cooperates with the guide tapered surface (406) to reduce the stress concentration of the fork (2).

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