JP2016061776A - Timepiece gear, pallet, balance, timepiece movement, and mechanical timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timepiece gear capable of reducing excess torque generated in a shaft rotation direction and suppressing a phase shift in a rotational direction between a gear and a shaft part, a pallet, a balance, a timepiece movement, and a mechanical timepiece.SOLUTION: A timepiece gear comprises: a shaft part composed of a lower shaft part 124b and an upper shaft part 124a; an intermediate member 127 fixed to the lower shaft part 124b; and a gear body 124A that has an opening 124e into which the intermediate member 127 is inserted and that is mounted on the shaft part via the intermediate member 127. The intermediate member 127 is provided with elastic deformation parts 127a that can rotate relatively to the gear body 124A and forming a restoration part F for preventing a shift in a rotational direction between the intermediate member 127 and the gear body 124A.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a timepiece gear, an ankle, a balance, a movement for a timepiece, and a mechanical timepiece.

  In recent years, brittle materials with small specific gravity, such as silicon, have been used for escape spring parts such as hairsprings, escape wheels and ankles, with the aim of improving the performance of mechanical watches, such as watch accuracy and energy transfer characteristics. It is like that. In many of the timepiece gears constituting the mechanical timepiece, the shaft portion is made of metal, and the gears into which the shaft portion is press-fitted are made of a brittle material.

  Here, when the shaft portion is driven into the opening of a gear made of silicon, which is a brittle material, the gear may be damaged by a load applied at that time. Therefore, in a timepiece gear in which a shaft portion is driven and fixed in an opening of a silicon gear that is a brittle material, a configuration in which an elastic deformation portion is provided on the periphery of the opening of the gear has been proposed (for example, a patent) Reference 1).

Special table 2009-528524 gazette

However, in the configuration of the conventional timepiece gear as disclosed in Patent Document 1, when excessive driving torque is generated in the axial rotation direction due to external force or the like, excessive stress is concentrated on the elastically deformed portion of the gear made of brittle material. As a result, the gear may be damaged.
In addition, even if the elastic deformation portion absorbs excessive stress applied to the gear and the gear is not damaged, application of excessive torque causes a phase shift in the rotational direction between the shaft portion and the gear. There was a fear.

  The present invention has been made in view of the above problems, and can reduce excessive torque generated in the shaft rotation direction and can suppress a phase shift in the rotation direction between the gear and the shaft portion, and an ankle An object of the present invention is to provide a balance with a balance, a movement for a timepiece, and a mechanical timepiece.

  In order to solve the above-described problem, a timepiece gear according to the present invention includes a shaft portion, an intermediate member fixed to the shaft portion, and an opening into which the intermediate member is inserted. A gear mounted on a shaft portion, and is relatively rotatable between the intermediate member and the gear, and returns the rotational displacement between the intermediate member and the gear to a normal position. A restoration unit is provided.

  According to the present invention, the intermediate member can be rotated relative to the gear, and further includes a restoring unit that returns the shift in the rotation direction between the intermediate member and the gear to the normal position. Even when excessive torque occurs, this torque can be buffered and the gear can be prevented from being damaged. In addition, it is possible to suppress the phase shift in the rotation direction between the gear and the shaft portion, and even when this phase shift occurs, the phase shift can be immediately absorbed and restored.

Moreover, the timepiece gear of the present invention can employ a configuration in which the restoring portion includes an elastic deformation portion in the above configuration.
According to the present invention, since the restoring portion includes the elastic deformation portion, the effect of buffering excessive torque generated in the shaft rotation direction due to an external force or the like as described above, and the phase shift in the rotation direction between the gear and the shaft portion are provided. Both of the effects of suppressing or returning can be stably obtained.

In the timepiece gear according to the present invention, in the above configuration, the elastically deforming portion is a double-supported beam, and an inner surface of the opening is provided with a convex portion that contacts the double-supported beam. It is preferable that the restoration part is constituted by the beam and the convex part.
According to the present invention, both the above-described torque buffering effect and the effect of suppressing or restoring the phase shift in the rotational direction are achieved by pressing the elastically deforming portion that is a doubly supported beam by the convex portion provided on the gear. Is remarkably obtained.

Further, the timepiece gear of the present invention has a configuration in which, in the above configuration, the intermediate member is formed in a polygonal shape in plan view, and the elastic deformation portion is provided on a flat surface on the outer periphery of the polygonal shape. can do.
According to the present invention, by providing the elastic deformation portion on the outer peripheral flat surface of the polygonal intermediate member, both the above-described torque buffering effect and the effect of suppressing or returning the phase shift can be obtained remarkably. Further, when the gear is assembled to the intermediate member, it can be assembled while adjusting the amount of eccentricity by the restoring portion, so that the amount of eccentricity between the gear and the shaft portion can be minimized.

In the timepiece gear according to the present invention, in the above configuration, the gear is provided with a collar portion protruding radially inward at least at a part of the opening, and the intermediate member is provided on the shaft portion. It is preferable that a diameter-enlarged portion that is enlarged by a step is provided at a position that avoids the fixed portion, and the flange portion is sandwiched between the intermediate member and the enlarged-diameter portion.
According to the present invention, since the gear and the intermediate member are reliably engaged by the flange formed on the gear, it is possible to prevent the gear from being detached.

  Further, the timepiece gear of the present invention is configured so that, in the above-described configuration, the intermediate member is further applied with an urging force in the axial direction of the shaft portion with respect to the inner surface of the opening portion and is directed radially outward. It is possible to employ a configuration in which an arm portion having a stress concentration portion that is elastically deformed so as to give a force is provided, and the elastic deformation portion is provided at the tip of the arm portion.

  According to the present invention, by providing the intermediate member having the arm portion having the above-described configuration, the stress concentration portion is elastically deformed by the axial force, so that the arm portion is enlarged uniformly at the same timing toward the radially outer side. To do. As a result, the radially outward biasing force is evenly obtained, and the effect of buffering excessive torque generated in the axial rotation direction by the external force or the like as described above and the phase shift in the rotational direction between the gear and the shaft portion are reduced. Both the effect of suppressing or returning can be stably obtained, and the assembling property when the intermediate member is assembled is also improved. In addition, the opening provided in the gear functions as a flange that engages with the intermediate member, and the state in which the biasing force is applied to the flange in the axial direction is maintained, so that the gear and the intermediate member Is securely engaged, so that gears can be prevented from dropping off.

  Further, the timepiece gear of the present invention has the above-described configuration, wherein the intermediate member includes a cylindrical fixing portion fixed to the shaft portion, and the arm portion is provided on one end side of the fixing portion. It is formed so as to extend in plural from the stress concentration part toward the opening part side, and is formed radially outward in the radial direction, and the arm part is provided on at least a part of the arm part. The stress concentration portion is elastically deformed by the axial force of the shaft portion, thereby applying an urging force in the axial direction to the inner surface of the opening portion, and the elastic deformation portion is an inner surface of the opening portion. It is preferable that it is the structure which provides urging | biasing force toward a radial direction outer side by contacting.

  According to the present invention, by providing the intermediate member having the plurality of arm portions having the above-described configuration, the urging force toward the radially outer side can be obtained uniformly, and the excessive force generated in the axial rotation direction due to the external force or the like as described above. Both the effect of buffering the torque and the effect of suppressing or returning the phase shift in the rotational direction between the gear and the shaft are remarkably obtained, and the assembling property when assembling the intermediate member is further improved. Further, as described above, the opening provided in the gear functions as a flange that engages with the intermediate member, and a state in which an urging force is applied to the flange in the axial direction is maintained. Since the intermediate member is securely engaged, it is possible to prevent the gear from dropping off.

In the timepiece gear according to the aspect of the invention described above, it is more preferable that the stress concentration portion of the intermediate member is formed thin.
According to the present invention, since the stress concentration portion is formed to be thin, elastic deformation when assembling the intermediate member can be obtained more evenly. Both the effect of buffering the torque and the effect of suppressing or returning the phase shift in the rotational direction between the gear and the shaft are more prominently obtained, and the effect of improving the assemblability is more prominently obtained.

Moreover, the timepiece gear of the present invention can employ a configuration in which the intermediate member is made of a metal material and the gear is made of a brittle material.
According to the present invention, in particular, when the above-described materials are used for the intermediate member and the gear, the above-described effect of preventing the gear from being broken due to the buffering of excessive torque generated in the shaft rotation direction can be obtained.

In the ankle according to the present invention, the intermediate member having the above-described structure is fixed to the shaft portion, and the intermediate member is inserted into the opening portion of the ankle body having the opening portion having the above-described structure, whereby the ankle body is moved to the shaft. The intermediate member and the ankle body are rotatable relative to each other, and the rotational displacement between the intermediate member and the ankle body is returned to the normal position. A restoration unit is provided.
In the balance of the present invention, the intermediate member having the above-described structure is fixed to the shaft portion, and the intermediate member is provided in the opening portion of either the balance wheel or the whisker ball having the opening portion having the structure described above. And the balance wheel or the beard ball is fixed to the shaft portion, and the intermediate member and the balance wheel or the beard ball are relatively rotatable. And a restoring portion for returning a shift in a rotational direction between the intermediate member and the balance wheel or the whisker ball to a normal position.

  According to the present invention, since it has a structure similar to that of the timepiece gear according to the present invention, it is provided with a restoring portion that returns the displacement in the rotational direction to the normal position as described above, so that it can be rotated in the axial direction by an external force or the like. Even when excessive torque is generated, this torque can be buffered, and damage to the ankle body, the balance wheel, or the hairspring-integrated hairspring can be prevented. In addition, it is possible to suppress the phase shift in the rotational direction of the shaft portion and the ankle body, the balance wheel, or the balance-spring-integrated hairspring, and immediately absorb the phase shift even when this phase shift occurs. Can be restored. In particular, in the balance of the present invention, by adopting the above-described structure, it is possible to prevent a change in balance-damped vibration caused by a phase shift between the balance-spring-integrated hairspring and the balance, so that an effect of maintaining timekeeping accuracy can be obtained. .

A timepiece movement according to the present invention includes at least one of the above timepiece gears, ankles, and balances.
A mechanical timepiece according to the invention includes the above-described timepiece movement.
According to these inventions, since the timepiece gear of the present invention is provided, the timepiece accuracy is extremely excellent.

  According to the present invention, the gear and the shaft portion are assembled via the intermediate member, the intermediate member can be rotated relative to the gear, and the rotational displacement between the intermediate member and the gear is returned to the normal position. Since the restoring portion is provided, even when an excessive torque is generated in the axial rotation direction due to an external force or the like, this torque can be buffered and the gear can be prevented from being damaged. In addition, it is possible to suppress the phase shift in the rotation direction between the gear and the shaft portion, and even when this phase shift occurs, it is possible to immediately absorb and restore the phase shift.

FIG. 1 is a diagram for explaining an example of a mechanical timepiece according to an embodiment of the present invention, and is a plan view on the complete front side. FIG. 2 is a view for explaining an example of a mechanical timepiece according to an embodiment of the present invention, and is a plan view of the timepiece movement front side. FIG. 3 is a schematic diagram for explaining an example of a timepiece gear according to an embodiment of the present invention, and is a partial cross-sectional view illustrating a portion from an barrel wheel to a escape wheel. 4A and 4B are schematic views for explaining an example of a timepiece gear according to an embodiment of the present invention. FIG. 4A is a perspective view of the timepiece gear as viewed from the lower surface side, and FIG. 4B is a side view. FIG. 5 is a schematic diagram illustrating an example of a timepiece gear according to an embodiment of the present invention, and is an exploded perspective view of a shaft portion, an intermediate member, and a gear. 6A and 6B are schematic views for explaining another example of a timepiece gear according to an embodiment of the present invention. FIG. 6A is a perspective view of the timepiece gear as viewed from the lower surface side, and FIG. is there. 7A and 7B are schematic views for explaining another example of the timepiece gear according to the embodiment of the present invention. FIG. 7A is a plan view of the timepiece gear viewed from the lower surface side, and FIG. 7B is a side view. . FIG. 8 is a schematic diagram for explaining another example of a timepiece gear according to an embodiment of the present invention, in which (a) is a perspective view showing the intermediate member as a single unit, and (b) is a perspective view of the timepiece gear. is there.

  Hereinafter, examples of a timepiece gear, an ankle, a balance with a balance, a movement for a timepiece, and a mechanical timepiece which are embodiments of the present invention will be given, and the configuration thereof will be described in detail with reference to FIGS. Note that the drawings used in the following description may show the characteristic parts in an enlarged manner for the sake of convenience in order to make the characteristics easy to understand. There is.

(clock)
In general, a machine body including a drive part of a mechanical timepiece is referred to as a “movement”. A state in which a dial and hands are attached to the movement and put into a watch case to make a finished product is called “complete” of the watch. In addition, among the two sides of the main plate constituting the watch substrate, the glass case side of the watch case, that is, the dial plate side is the “back side” or “glass side” or “dial side” of the movement. Called. Of the two sides of the main plate, the side with the back cover of the watch case, that is, the side opposite to the dial is referred to as the “front side” or “back side” of the movement.

FIG. 1 is a plan view of the front side of a complete 1 a of the mechanical timepiece 1.
As shown in FIG. 1, the complete time 1a of the mechanical timepiece 1 includes a dial 2 having a scale 3 indicating time information, an hour hand 4a indicating time, a minute hand 4b indicating minutes, and a second hand 4c indicating seconds. Needle 4.

FIG. 2 is a plan view of the movement front side. In FIG. 2, some of the timepiece components constituting the timepiece movement 100 are omitted for easy understanding of the drawing.
A timepiece movement 100 of a mechanical timepiece has a base plate 102 constituting a substrate. A winding stem 110 is rotatably incorporated in the winding stem guide hole 102 a of the main plate 102. The position of the winding stem 110 in the axial direction is determined by a switching device including a setting lever 190, a yoke 192, a yoke spring 194 and a back presser 196.
When the winding stem 110 is rotated, the chisel wheel 112 is rotated through the rotation of the clutch wheel (not shown). The round hole wheel 114 and the square hole wheel 116 are rotated in turn by the rotation of the hour wheel 112, and the mainspring 122 (see FIG. 3) accommodated in the barrel complete 120 is wound up.

The barrel complete 120 is rotatably supported between the main plate 102 and the barrel holder 160. Second wheel (clock gear) 124, third wheel (clock gear) 126, fourth wheel (clock gear) 128 and escape wheel 130 are rotatable between the main plate 102 and the train wheel bridge 162. It is supported by.
When the barrel wheel 120 is rotated by the restoring force of the mainspring, the second wheel 124, the third wheel 126, the fourth wheel 128, and the escape wheel 130 are sequentially rotated by the rotation of the barrel wheel 120. The barrel wheel 120, the second wheel 124, the third wheel 126, and the fourth wheel 128 constitute a front wheel train.

  When the center wheel & pinion 124 rotates, the hour pinion 150 (see FIG. 3) simultaneously rotates based on the rotation, and the minute hand 4b (see FIG. 1) attached to the hour pinion indicates “minute”. ing. Further, based on the rotation of the hour pinion 150, the hour wheel 154 (see FIG. 3) rotates through the rotation of the minute wheel (not shown), and the hour hand 4a (see FIG. 1) attached to the hour wheel 4 “Time” is displayed.

The escapement and speed control device for controlling the rotation of the front train wheel is composed of an escape wheel 130, ankle 142 and balance 10.
On the outer periphery of the escape wheel & pinion 130, teeth 130d are formed. The ankle 142 is rotatably supported between the main plate 102 and the ankle receiver 164, and includes a pair of pallets 142a and 142b. The escape wheel 130 is temporarily stopped in a state where one pallet 142a of the ankle 142 is engaged with the teeth 130d of the escape wheel 130.
The balance with hairspring 10 is reciprocally rotated at a constant period to alternately engage and release one claw stone 142 a and the other claw stone 142 b of the ankle 142 with the teeth 130 d of the escape wheel 130. Thereby, the escape wheel & pinion 130 is escaped at a constant speed.

  As shown in FIG. 3, the barrel complete 120 includes a barrel complete gear 120 d, a barrel complete 120 f, and a mainspring 122. The barrel complete 120f includes an upper shaft portion 120a and a lower shaft portion 120b. The barrel complete 120f is formed of a metal such as carbon steel. The barrel gear 120d is formed of a metal such as brass.

  The second wheel & pinion 124 is provided with an upper shaft portion 124a, a lower shaft portion 124b, a pinion portion 124c, a gear portion 124d, and an abacus ball portion 124h. The pinion portion 124c of the center wheel & pinion 124 is configured to mesh with the barrel gear 120d. The upper shaft portion 124a, the lower shaft portion 124b, and the abacus ball portion 124h are made of a metal such as carbon steel. The gear portion 124d is formed of a metal such as brass.

  The third wheel & pinion 126 includes an upper shaft portion 126a, a lower shaft portion 126b, a pinion portion 126c, and a gear portion 126d. The pinion 126c of the third wheel & pinion 126 is configured to mesh with the gear portion 124d of the second wheel & pinion 124.

  The fourth wheel & pinion 128 includes an upper shaft portion 128a, a lower shaft portion 128b, a pinion portion 128c, and a gear portion 128d. A pinion portion 128c of the fourth wheel & pinion 128 is configured to mesh with a gear portion 126d of the third wheel & pinion 126. The upper shaft portion 128a and the lower shaft portion 128b are formed of a metal such as carbon steel. The gear portion 128d is formed of a metal such as brass.

  The escape wheel & pinion 130 includes an upper shaft portion 130 a, a lower shaft portion 130 b, an escape gear portion 130 c, and an escape wheel portion 132. The escape portion 130 c is configured to mesh with the gear portion 128 d of the fourth wheel & pinion 128.

  Although not shown in detail, the ankle 142 includes an ankle body and ankle true. The uncle true has an upper shaft portion and a lower shaft portion.

Here, in the barrel complete 120, the upper shaft portion 120a of the barrel complete 120f is supported so as to be rotatable with respect to the barrel holder 160. The lower shaft portion 120b of the barrel complete 120f is supported to be rotatable with respect to the main plate 102.
The second wheel 124, the third wheel 126, the fourth wheel 128, and the escape wheel 130 are supported rotatably with respect to the main plate 102 and the train wheel bridge 162, respectively. That is, the upper shaft portion 124a of the second wheel 124, the upper shaft portion 126a of the third wheel 126, the upper shaft portion 128a of the fourth wheel 128, and the upper shaft portion 130a of the escape wheel 130 are respectively connected to the train wheel bridge 162. Is supported rotatably. The lower shaft portion 124b of the center wheel 124, the lower shaft portion 126b of the third wheel 126, the lower shaft portion 128b of the fourth wheel 128, and the lower shaft portion 130b of the escape wheel 130 are respectively connected to the main plate 102. And is rotatably supported.

  The ankle 142 is rotatably supported with respect to the main plate 102 and the ankle receiver 164. That is, the upper shaft portion of the ankle 142 is supported so as to be rotatable with respect to the ankle receiver 164. The lower shaft portion of the ankle 142 is supported to be rotatable with respect to the main plate 102.

  In addition, the bearing part of the barrel holder 160 that rotatably supports the upper shaft part 120a of the barrel complete 120f, the bearing part of the train wheel ring 162 that rotatably supports the upper shaft part 124a of the center wheel & pinion 124, and the third The bearing portion of the train wheel bridge 162 that rotatably supports the upper shaft portion 126a of the wheel 126, the bearing portion of the wheel train wheel bearing 162 that rotatably supports the upper shaft portion 128a of the fourth wheel & pinion 128, and the escape wheel. The bearing portion of the train wheel bridge 162 that rotatably supports the upper shaft portion 130a of 130, and the bearing portion of the ankle receiver 164 that rotatably supports the upper shaft portion of the ankle 142 are lubricated. Yes.

Further, the bearing portion of the main plate 102 that rotatably supports the lower shaft portion 120b of the barrel complete 120f, the bearing portion of the main plate 102 that rotatably supports the lower shaft portion 124b of the center wheel & pinion 124, and the third wheel 126 A bearing portion of the main plate 102 that rotatably supports the lower shaft portion 126b, a bearing portion of the main plate 102 that rotatably supports the lower shaft portion 128b of the fourth wheel & pinion 128, and a lower shaft portion 130b of the escape wheel 130. Lubricating oil is injected into the bearing portion of the ground plate 102 that is rotatably supported and the bearing portion of the ground plate 102 that rotatably supports the lower shaft portion of the ankle 142.
The lubricating oil described above is preferably a precision machine oil, and particularly preferably a so-called watch oil.

In order to enhance the lubricating oil retention performance, each bearing part of the main plate 102, each bearing part of the barrel holder 160, and each bearing part of the train wheel bridge 162 has a conical, cylindrical, or frustoconical oil sump. It is preferable to provide a part. Providing this oil reservoir can effectively prevent the oil from diffusing due to the surface tension of the lubricating oil.
Further, the main plate 102, the barrel holder 160, the train wheel bridge 162, and the ankle receiver 164 may be formed of metal such as brass, or may be formed of resin such as polycarbonate.

  Although the balance with the balance 10 is not shown in detail, the balance 10 is mainly composed of a balance wheel formed in a substantially annular shape, a spring as a rod-shaped member, a balance spring formed in a spiral shape, and a balance spring. It is equipped with a whisker ball which is fixed on the exterior with its axes aligned and which fixes the balance spring in a true manner.

(Clock gear, ankle and balance)
FIG. 4 is an enlarged view of the above-mentioned second wheel & pinion 124 as an example of the timepiece gear of the present embodiment, and (a) is a perspective view of the second wheel & pinion 124 seen from the lower surface side. (B) is a side view. FIG. 5 is a perspective view showing an assembling form of each component constituting the center wheel & pinion 124.

  As described above, the center wheel & pinion 124 includes the upper shaft portion 124a and the lower shaft portion 124b which are shaft portions, and the kana portion 124c is attached to the upper shaft portion 124a. Further, the center wheel & pinion 124 includes a gear body 124A having an outer peripheral portion as a gear portion 124d and a vicinity of the rotation shaft as an opening portion 124e. The pinion portion 124c of the center wheel & pinion 124 is configured to mesh with the barrel wheel 120d of the barrel complete 120.

  In addition, the center wheel & pinion 124 that is a timepiece gear of the present embodiment includes an intermediate member 127 that is fixed to the lower shaft portion 124b. In the center wheel & pinion 124, an intermediate member 127 is inserted into an opening 124e provided in the gear body 124A, and the gear body 124A is attached to the lower shaft portion 124b via the intermediate member 127. The intermediate member 127 is rotatable relative to the gear body 124A, and is provided with an elastic deformation portion 127a that constitutes a restoring portion F that restores the rotational displacement between the intermediate member 127 and the gear body 124A to the normal position. In the illustrated example, the elastic deformation portions 127a are provided at four locations. The restoring portion F provided in the center wheel & pinion 124 of the present embodiment includes an elastic deformation portion 127a provided in the intermediate member 127 and a convex portion 124f provided in the gear body 124A, and the intermediate member 127 and the gear body 124A. Has a function of returning the shift in the rotational direction to the normal position.

  The upper shaft portion 124a and the lower shaft portion 124b constituting the center wheel & pinion 124 are not particularly limited. For example, a metal material or the like conventionally used for a shaft portion of a timepiece gear can be used without any limitation. The same applies to the kana portion 124c provided on the upper shaft portion 124a.

  In addition, the gear body 124A constituting the center wheel & pinion 124 is provided with an opening 124e so as to penetrate the vicinity of the substantially axial center of the gear body 124A. The opening 124e is formed in a polygonal shape in a plan view having a total of four convex portions 124f, and in the illustrated example, a substantially square shape in a plan view so as to correspond to the shape in plan view of the intermediate member 127 described later in detail. ing. The convex portion 124f is formed in an arc shape so as to protrude toward the inside of the opening portion 124e at each side of the opening portion 124e formed in a substantially square shape.

  In the present embodiment, a brittle material conventionally used for a gear material can be used as the material of the gear body 124A. An example of such a brittle material is silicon (Si).

Next, the intermediate member 127 provided in the center wheel & pinion 124 will be described in detail.
As shown in FIGS. 4A and 5, the intermediate member 127 is a plate-like member formed in a polygonal shape in plan view. Further, as shown in FIG. 5, the intermediate member 127 is formed in a substantially rectangular shape in plan view.

  Further, the intermediate member 127 is formed with elastic deformation portions 127a constituting the restoring portion F and having a doubly supported beam structure in which both end sides are fixed at a total of four locations on each of the flat surfaces on the rectangular outer periphery. Yes. The elastic deformation portion 127a is configured such that both ends 127j and 127j of the thin and thin elastic region 127b are supported at the corners of the four corners of the intermediate member 127, respectively.

  The intermediate member 127 is firmly assembled with the shaft portion by press-fitting the lower shaft portion 124b of the shaft portion including the upper shaft portion 124a and the lower shaft portion 124b into the shaft driving hole 127c.

  The intermediate member 127 is inserted into an opening 124e provided in the gear body 124A, and is assembled so as to be relatively rotatable with the gear body 124A. As described above, the elastically deforming portion 127a of the double-supported beam structure formed on the intermediate member 127 constitutes the restoring portion F with the convex portion 124f provided on the inner surface 124g of the opening 124e, and the elastic region 127b is It is pressed radially inward by the convex portion 124f.

  In the restoring portion F provided in the center wheel & pinion 124 of the present embodiment, since the convex portion 124f is formed in an arc shape so as to project radially inward, the gear body 124A will rotate with respect to the intermediate member 127. Then, the convex part 124f presses the elastic deformation part 127a smoothly and radially inward. At this time, since the elastic deformation portion 127a has a double-supported beam structure, the elastic deformation portion 127a tries to return toward the radially outer side. At this time, the pressing force acting on the convex portion 124f from the elastic deformation portion 127a acts in the rotation direction of the gear body 124A, and tries to push the gear body 124A back to the original position. Thus, even when excessive rotational torque is generated in the lower shaft portion 124b and the upper shaft portion 124a of the center wheel & pinion 124 due to external force or the like, this rotational torque can be buffered by the elastic action in the restoring portion F. The gear body 124A can be prevented from being damaged.

  Furthermore, according to the present embodiment, the elastic action in the restoring portion F described above can suppress a rotational phase shift between the gear body 124A, the lower shaft portion 124b, and the upper shaft portion 124a, and temporarily Even when a phase shift occurs, the phase shift can be immediately absorbed and restored.

  The material of the intermediate member 127 is not particularly limited as long as it is a metal material or the like having a predetermined strength or more and capable of functioning the elastic deformation portion 127a. Examples of the metal material used for the intermediate member 127 include phosphor bronze, stainless steel, carbon copper, Ni-Sn alloy, Ni-Fe alloy, and the like. Using these metal materials, The intermediate member 127 can be manufactured by photolithography such as LIGA or electrocasting.

  In the present embodiment, in particular, when a brittle material is used for the gear body 124A and a metal material as described above is used for the intermediate member 127, the above-described excessive torque generated in the axial rotation direction is buffered. The effect of preventing the body 124A from being destroyed is remarkably obtained.

  In the present embodiment, for convenience of explanation, a mode in which the timepiece gear according to the present invention is applied to the second wheel & pinion 124 is described. However, the present invention is not limited to this. The present invention can also be applied to the number wheel 128, escape wheel 130, etc. Furthermore, the structure described in the present embodiment is not limited to the above-described timepiece gear, but also parts manufactured by shaft driving similar to the above, such as the ankle 142 shown in FIG. It is possible to apply to various types of timepiece parts such as the balance with hairspring 10.

When the structure of the present embodiment is applied to the ankle 142, detailed illustration is omitted. For example, an intermediate member having an elastic deformation portion is fixed to the shaft portion, and the intermediate member is inserted into the opening portion of the ankle body. Thus, the ankle body can be structured to be fixed to the shaft portion.
Similarly, when the above structure is applied to the balance with hairspring 10, an intermediate member having an elastically deformable portion is fixed to the shaft portion, and the intermediate member is inserted into one or both of the balance wheel and the whiskers. By doing so, it is possible to make a structure in which the balance wheel or whiskers are fixed to the shaft portion.

  The second wheel 124, the third wheel 126, and the fourth wheel 128, which are the clock gears of the present embodiment, can buffer excessive torque generated in the axial rotation direction by an external force or the like as described above, and further, the gear body 124A. The phase shift in the rotational direction between the lower shaft portion 124b and the upper shaft portion 124a can be suppressed or restored, and the ankle 142 and the balance with hairspring 10 are the same. In particular, when the above-described structure is adopted for the balance with hairspring, it is possible to prevent a change in balance-damped vibration caused by a phase shift between the hairspring-integrated hairspring and the balance with a balance, and an effect of maintaining timekeeping accuracy can be obtained. Accordingly, the timepiece movement 100 employing these timepiece gears and various timepiece parts, and the mechanical timepiece 1 including the timepiece movement 100 are excellent in timepiece accuracy and energy transfer characteristics.

(Modification of watch gear)
Next, a modification of the timepiece gear of this embodiment will be described.
In the following description of each modification, the same configuration as the second wheel & pinion 124 described above may be denoted by the same reference numeral, and detailed description thereof may be omitted.

  6 is an enlarged view of a second wheel & pinion 224 which is another example of the timepiece gear of the present embodiment, and FIG. 6 (a) is a perspective view of the second wheel & pinion 224 as seen from the lower surface side. Is a side view. In FIG. 6A, the illustration of the intermediate member 227 shown in FIG. 6B is omitted for the sake of illustration, but this intermediate member 227 is not shown in FIGS. 4A and 5B. It has the same configuration as the intermediate member 127 shown inside.

  As shown in FIGS. 6A and 6B, the center wheel & pinion 224 has a shaft portion instead of the opening portion 124e formed through the gear body 124A as shown in FIGS. Of the upper shaft portion 224a and the lower shaft portion 224b constituting the gear body 224A around the shaft center hole 224h through which the lower shaft portion 224b is inserted, a non-penetrating concave region 224e is provided. It differs from the center wheel & pinion 124 shown in FIGS. 4 and 5 in that the intermediate member 227 is inserted into the concave region 224e. That is, the concave region 224 e corresponds to a flange that protrudes into at least a part of the opening and engages with the intermediate member 227.

According to the center wheel & pinion 224 shown in FIGS. 6A and 6B, the intermediate member 227 and the kana portion 224c sandwich the collar portion (concave region 224e), so that each shaft portion 224a, It is possible to prevent the gear body 224A from dropping from the 224b.
In place of the kana portion 224c, for example, an enlarged diameter portion (not shown) may be formed on the upper shaft portion 224a side, and the flange portion may be sandwiched between the enlarged diameter portion and the intermediate member 227.

  Next, FIG. 7 is an enlarged view showing a second wheel & pinion 324 which is another example of the timepiece gear of the present embodiment, and (a) is a plan view of the second wheel & pinion 324 viewed from the lower surface side. (B) is a side view. FIG. 8A is a perspective view showing the intermediate member 327 used in the second wheel 324 as a single unit, and FIG. 8B is a perspective view showing an assembled form of each component constituting the second wheel 324.

  The second wheel 324 shown in FIGS. 7A and 7B and FIGS. 8A and 8B is similar to the second wheel 224 described above, and includes an upper shaft portion 324a and a lower shaft portion 324b that constitute the shaft portion. Of these, a gear body 324A provided with an opening 324e made of a non-penetrating concave region is used around a shaft hole 324h through which the lower shaft portion 324b is inserted, and an intermediate member is formed in the concave region 324e. 327 is inserted. That is, the concave region 324e corresponds to a flange that protrudes into at least a part of the opening and engages with the intermediate member 327. An intermediate member 327 provided with an elastic deformation portion 327a is inserted and fitted into the opening 324e.

  Further, the center wheel & pinion 324 shown in FIGS. 7A and 7B and FIGS. 8A and 8B has intermediate members 127 and 227 made of plate-like members formed in a substantially square shape in plan view. Instead, an arm portion 327b having a stress concentration portion 327c that applies an urging force in the axial direction to the inner surface 324g of the opening 324e and elastically deforms so as to apply the urging force radially outward is provided. An intermediate member 327 having an elastic deformation portion 327a provided at the tip of the arm portion 327b is used.

The intermediate member 327 includes a cylindrical fixing portion 327B that is fixed to the lower shaft portion 324b.
The arm portion 327h is formed so as to extend in a plurality from the stress concentration portion 327c provided on the one end 327f side of the fixing portion 327B toward the opening portion 324e before being assembled to the gear body 324A. , Are formed radially outward. In the illustrated example, a total of four arm portions 327h are provided and arranged so as to have a uniform interval (angle) toward the radially outer side, that is, an angle of 90 ° between adjacent arm portions 327h. Yes. Further, at least a part of the arm portion 327h is a stress concentration portion 327k in the length direction toward the radially outer side, and in the illustrated example, a portion of the arm portion 327h near the fixing portion 324B is a stress concentration portion 327k. ing. Moreover, in the example of illustration, each arm part 327h is formed in the substantially pentagon shape by planar view.

  As described above, the arm portion 327h provided at a total of four locations is formed on the inner surface 324g of the opening 324e by the stress concentration portion 327k provided on the arm portion 327h being elastically deformed by the axial force of the shaft portion. In contrast, an urging force is applied in the axial direction. Further, the elastic deformation portion 327a provided at the tip of the arm portion 327h is configured to abut against the inner surface 324g of the opening 324e, thereby applying a biasing force toward the radially outer side.

  The elastic deformation portion 327a provided at the tip of the arm portion 327h is restored between the convex portion 324f in the opening 324e, similarly to the elastic deformation portion 127a provided in the intermediate member 127 used in the center wheel & pinion 124 described above. It constitutes the part F, and has a doubly supported beam structure in which both end sides are fixed. That is, the elastic deformation portion 327a is provided in each of the arm portions 327h provided in a total of four places, and both ends 327j and 327j of the thin and thin elastic region 327b are respectively the corner portions at the tips of the arm portions 327h. It is configured to be supported.

  According to the center wheel & pinion 324, by assembling the intermediate member 327 to the gear body 324A, first, the stress concentration portion 327c is elastically deformed by the force in the axial direction, and the arm portion 327h is equally distributed at the same timing toward the radially outer side. Expand to. At this time, the elastic deformation portion 327a provided at the tip of the arm portion 327h abuts on the convex portion 324f and applies a biasing force radially outward. As a result, the radially outward biasing force is evenly obtained, and the effect of buffering excessive torque generated in the axial rotation direction by the external force or the like as described above and the phase shift in the rotational direction between the gear and the shaft portion are reduced. Both the effect of suppressing or returning can be stably obtained. Further, when the intermediate member 327 is assembled to the gear body 324A, each of the stress concentration portions 327c in the plurality of arm portions 327h is bent at the same time, so that it is possible to easily assemble without using a complicated jig. Is significantly improved.

  Furthermore, according to the center wheel & pinion 324, the opening 324e formed of a non-penetrating concave region in the gear body 324A functions as a flange that engages with the intermediate member 327, and is attached to the flange in the axial direction. The state of applying power is maintained. As a result, the gear body 324A and the intermediate member 327 are securely engaged with each other, so that the gear body 324A can be prevented from falling off the shaft portions (the upper shaft portion 324a and the lower shaft portion 324b).

  In the present example, it is more preferable that the stress concentration portion 327c provided in the intermediate member 327 is formed thinner than other portions constituting the intermediate member 327. As a result, the elastic deformation at the time of assembling the intermediate member 327 to the gear body 324A can be obtained more evenly. Therefore, the effect of buffering the excessive torque generated in the shaft rotation direction by the external force as described above, the gear and the shaft portion Both of the effects of suppressing or returning the phase shift in the rotation direction with the above are more prominently obtained, and the effect of improving the assemblability is also more prominently obtained.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention. For example, the elastic deformation portion may be configured as a separate member from the intermediate member, or a configuration in which an elastic deformation portion is provided in the opening of the gear body and a convex portion is provided in the intermediate member may be employed. Is possible.

DESCRIPTION OF SYMBOLS 1 ... Mechanical timepiece, 124, 224, 324 ... Second wheel (clock gear), 124A, 224A, 324A ... Gear body (gear), 124a, 224a, 324a ... Upper shaft portion (shaft portion), 124b, 224b , 324b ... lower shaft (shaft), 124e ... opening, 324e ... opening (concave region, flange), 124f, 324f ... convex (restoration part), 124g, 324g ... inner surface, 224e ... concave region ( 127), third wheel (gear for clock), 127, 227, 327 ... intermediate member, 127a, 327a ... elastic deformation part (restoring part), 127b, 327b ... elastic region, 127j, 327j ... both ends (elastic) Area), 127c, 227c ... shaft driving hole, 327h ... arm part, 327k ... stress concentration part, 327B ... fixed part (cylindrical fixed part), 327f ... one end (fixed part), 128 ... fourth wheel (Timepiece gear), 10 ... Tempe, 142 ... Ankle, 100 ... Movement for watch, A ... Adhesive, F ... Restoration part.

Claims (13)

The shaft,
An intermediate member fixed to the shaft portion;
A gear having an opening into which the intermediate member is inserted, and being attached to the shaft through the intermediate member;
Between the said intermediate member and the said gearwheel, while being able to rotate relatively, the restoring part which returns the shift | offset | difference of the rotation direction of the said intermediate member and the said gearwheel to a normal position is provided, It is characterized by the above-mentioned. Watch gear.   The timepiece gear according to claim 1, wherein the restoration portion includes an elastic deformation portion. The elastic deformation part is a doubly supported beam,
The inner surface of the opening is provided with a convex portion that comes into contact with the both-end supported beam,
The timepiece gear according to claim 2, wherein the restoring portion is configured by the both-end supported beam and the convex portion.   4. The timepiece according to claim 2, wherein the intermediate member is formed in a polygonal shape in a plan view, and the elastic deformation portion is provided on a flat surface on an outer periphery of the polygonal shape. Gears. The gear is provided with a flange protruding radially inward at least at a part of the opening,
The shaft portion is provided with a diameter-expanded portion that is diameter-expanded by a step at a position that avoids a place where the intermediate member is fixed,
The timepiece gear according to any one of claims 1 to 4, wherein the flange portion is sandwiched between the intermediate member and the enlarged diameter portion.   The intermediate member is further provided with a stress concentration portion that applies an urging force in the axial direction of the shaft portion to the inner surface of the opening and elastically deforms so as to apply an urging force toward the radially outer side. The timepiece gear according to any one of claims 2 to 5, wherein an arm portion is provided, and the elastic deformation portion is provided at a tip of the arm portion. The intermediate member includes a cylindrical fixing portion fixed to the shaft portion,
The arm portion is formed so as to extend in plural from the stress concentration portion provided on one end side of the fixed portion toward the opening portion side, and is formed radially toward the radially outer side. And
The arm portion has a biasing force in the axial direction against the inner surface of the opening portion by elastically deforming the stress concentration portion provided in at least a part of the arm portion by the axial force of the shaft portion. The timepiece gear according to claim 6, wherein the urging force is applied to the outer side in the radial direction by the elastic deformation portion being in contact with the inner surface of the opening portion.   The timepiece gear according to claim 6 or 7, wherein the intermediate member has the stress concentration portion formed thin.   The timepiece gear according to any one of claims 1 to 8, wherein the intermediate member is made of a metal material and the gear is made of a brittle material.   An intermediate body according to any one of claims 1 to 9 is fixed to a shaft portion, and an ankle body having an opening having a structure according to any one of claims 1 to 6. The intermediate member is inserted into the opening so that the ankle body is fixed to the shaft portion, and between the intermediate member and the ankle body is relatively rotatable, An ankle comprising: a restoring portion for returning a shift in a rotation direction between the intermediate member and the ankle body to a normal position.   The intermediate member according to any one of claims 1 to 9, wherein the intermediate member is fixed to the shaft portion, and the balance wheel having an opening having the structure according to any one of claims 1 to 9, The balance wheel or the balance ball is fixed to the shaft portion by inserting the intermediate member into one or both of the openings, and the intermediate member and the balance wheel or Between the beard balls, a relative rotation is possible, and a restoring portion is provided for returning a shift in the rotation direction between the intermediate member and the balance wheel or the beard ball to a normal position. Tempu. A timepiece movement comprising at least one of the timepiece gear according to any one of claims 1 to 9, the ankle according to claim 10, and the balance according to claim 11. .   A mechanical timepiece comprising the timepiece movement according to claim 12.

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