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CN-224217000-U - Clock fork shaft with positioning shoulder

CN224217000UCN 224217000 UCN224217000 UCN 224217000UCN-224217000-U

Abstract

The utility model provides a clock fork shaft with a positioning shoulder, which belongs to the technical field of precision timing instruments and comprises a shell, wherein a pallet stone and an escape wheel are movably arranged on the inner side of the shell, and a positioning shoulder assembly 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 surface, a lower shaft neck, a guide conical surface, an annular positioning surface and an anti-rotation groove, wherein the positioning shoulder assembly is arranged to enable the upper shaft neck and the lower shaft neck to be matched with the upper shaft neck and the lower shaft neck of a specific size, so that the pallet stone can be accurately positioned in an escapement mechanism, the two anti-rotation grooves are symmetrically machined on the positioning shoulder to be matched with the protrusions on the pallet stone, the working stability is effectively enhanced, the positioning shoulder can avoid circumferential displacement through the anti-rotation groove, and the stress concentration of the pallet stone can be reduced through the arrangement of the guide conical surface and the conical transition surface.

Inventors

  • YU WENBO

Assignees

  • 青岛智晟达仪器有限公司

Dates

Publication Date
20260508
Application Date
20250718

Claims (7)

  1. 1. The clock fork shaft with the positioning shoulder is characterized by comprising a shell (1), wherein a pallet stone (2) and an escape wheel (3) are movably arranged on the inner side of the shell (1), and a positioning shoulder assembly (4) is arranged on the inner side of the shell (1); The positioning shoulder assembly (4) comprises a shaft body (401), a positioning shoulder (402), an upper shaft neck (403), a conical transition surface (404), a lower shaft neck (405), a guide conical surface (406), an annular positioning surface (407) and an anti-rotation groove (408); The shaft body (401) is arranged on the inner side of the shell (1), the positioning shoulder (402) is integrally formed on the surface of the positioning shoulder (402), the upper shaft neck (403) and the lower shaft neck (405) are respectively arranged on two sides of the positioning shoulder (402), the conical transition surface (404) is arranged on the outer wall of the shaft body (401), the guide conical surface (406) is arranged on the surface of the supporting rod part of the lower shaft neck (405), the annular positioning surface (407) is arranged on one side of the positioning shoulder (402), and the anti-rotation groove (408) is formed on the surface of the positioning shoulder (402).
  2. 2. The timepiece fork shaft with a positioning shoulder according to claim 1, characterized in that the outer diameters of the upper journal (403) and the lower journal (405) are smaller than the outer diameter of the positioning shoulder (402).
  3. 3. The timepiece fork shaft with positioning shoulder according to claim 1, characterized in that the number of anti-rotation grooves (408) is two and is symmetrically arranged.
  4. 4. Timepiece fork shaft with positioning shoulder according to claim 1, characterized in that said anti-rotation groove (408) cooperates with a protrusion on the escapement plate of the escape wheel (3) and in that said anti-rotation groove (408) is intended to prevent the pallet stone (2) from shaking.
  5. 5. The timepiece fork shaft with positioning shoulder according to claim 1, characterized in that the outer wall surface of the guiding cone (406) matches the outer wall surface of the conical transition surface (404).
  6. 6. The timepiece fork shaft with 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 face (407).
  7. 7. The timepiece fork shaft with positioning shoulder according to claim 1, characterized in that said conical transition surface (404) cooperates with said guiding conical surface (406) for reducing the stress concentration of said fork shoe (2).

Description

Clock fork shaft with positioning shoulder Technical Field The utility model relates to the technical field of precision timing instruments, in particular to a clock fork shaft with a positioning shoulder. Background "Timepiece fork" generally refers to a critical component of a timepiece movement, particularly playing an important role in a mechanical timepiece, the fork being part of an escapement, connected to the escapement fork, the main function being to convert the oscillation of the balance into intermittent motion of the gear train, so as to control the release of energy, ensuring the precision of the travel time of the timepiece; the axial positioning inaccuracy of the traditional clock fork shaft causes deviation when the escapement wheel is meshed with the pallet, and the prior art adopts a gasket or thread locking mode, so that the defects of complex assembly, easy loosening and the like are caused; accordingly, the present application provides a timepiece fork shaft with a locating shoulder to meet a need. Disclosure of utility model The utility model aims to solve the problems in the prior art and provides a clock fork shaft with a positioning shoulder. The utility model aims to solve the technical problem of providing a clock fork shaft with a positioning shoulder so as to solve the problem of the existing clock fork shaft with the positioning shoulder. In order to solve the technical problems, the utility model provides the following technical scheme: The inner side of the shell is movably provided with a pallet stone and an escape wheel, and a positioning shoulder assembly is arranged on the inner side of the shell; The positioning shoulder assembly comprises a shaft body, a positioning shoulder, an upper journal, a conical transition surface, a lower journal, a guide conical surface, an annular positioning surface and an anti-rotation groove; the shaft body is arranged on the inner side of the shell, the positioning shoulder is integrally formed on the surface of the positioning shoulder, the upper shaft neck and the lower shaft neck are respectively positioned on two sides of the positioning shoulder, the conical transition surface is arranged on the outer wall of the shaft body, the guide conical surface is arranged on the surface of the supporting rod part of the lower shaft neck, the annular positioning surface is arranged on one side of the positioning shoulder, and the anti-rotation groove is formed in the surface of the positioning shoulder. Preferably, the outer diameters of the upper journal and the lower journal are smaller than the outer diameters of the positioning shoulders. Preferably, the number of the anti-rotation grooves is two, and the anti-rotation grooves are symmetrically arranged. Preferably, the anti-rotation groove is matched with a protruding part on an escapement plate of the escapement wheel, and the anti-rotation groove is used for preventing the pallet from easily shaking. Preferably, the outer wall surface of the guiding cone is matched with the outer wall surface of the cone transition surface. Preferably, the outer wall surface of the upper journal matches the outer wall surface of the annular locating surface. Preferably, the tapered transition surface cooperates with the guide tapered surface for reducing stress concentration of the pallet stone. Compared with the prior art, the utility model has at least the following beneficial effects: In the scheme, through setting up location shoulder subassembly, make the upper journal and the lower journal of cooperation specific size, realize the accurate positioning of pallet stone in escapement, and through symmetrical processing two anti-rotation recesses on the location shoulder, make it with the protruding cooperation on the pallet stone, prevent that the pallet stone from rocking easily, effectively strengthen job stabilization nature, and then location shoulder accessible anti-rotation recess avoids the circumference displacement, and through setting up the stress concentration that guide cone cooperatees reducible pallet stone with the toper transitional surface, this design can improve clock and watch travel time precision and increase of service life, thereby reduce the processing degree of difficulty when guaranteeing the location precision through optimizing location shoulder structure. Drawings The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure. FIG. 1 is a schematic diagram of the overall structure of the present utility model; FIG. 2 is a schematic side view of the present utility model; FIG. 3 is a schematic view of the overall structure of the positioning shoulder assembly of the present utility model; FIG. 4 is a schematic top vie