JP7407626B2 - Watch gears, movements and watches - Google Patents

Description

The present invention relates to a timepiece gear, a movement, and a timepiece.

BACKGROUND ART In a clock movement, a configuration is known in which a plurality of gears are used to transmit power and drive each hand. For these gears, various techniques have been proposed for causing the gear to slip with respect to the shaft when a torque of a predetermined value or more is applied between the shaft and the gear.

For example, Patent Document 1 discloses a branch wheel that has a metal gear and a resin shaft that is insert-molded so as to wrap around the gear, and that secures slip torque by frictional resistance between the resin material and the metal material. The configuration is disclosed. According to the technique described in Patent Document 1, by attaching the shaft so as to wrap around the gear, the contact area between the shaft and the gear can be increased with a simple configuration, and a stable slipping function can be ensured. In addition, it is said that the split wheel can be manufactured easily because there is no need to make the gear and shaft into complicated shapes in order to provide the slip function.

Utility Model Publication No. 2-77689

However, in the technique described in Patent Document 1, the metal gear and the resin shaft slide against each other. Generally, metal materials have higher hardness than resin materials, so in the technique described in Patent Document 1 in which the metal material and the resin material slide, the resin is likely to wear out in the sliding portion. Therefore, the durability of the shaft tends to deteriorate, and there is room for improvement in terms of stabilizing slip torque.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a timepiece gear capable of stably maintaining slip torque with a simple configuration, a movement and a timepiece equipped with this timepiece gear.

In order to solve the above-mentioned problems, a timepiece gear according to one embodiment of the present invention includes a shaft member at least partially formed of a resin material, and a shaft member that is penetrated through the shaft member. The gear member is provided so as to be slidable on the shaft member in a state in which the gear member is slidable with respect to the shaft member, and has a sliding portion where resin materials are in contact with each other in the radial direction of the shaft member.

According to this configuration, the resin materials slide against each other in the sliding portion where the gear member and the shaft member slide against each other in the radial direction. Thereby, wear of the resin material can be suppressed compared to the conventional technique in which the metal material and the resin material slide against each other in the sliding portion. Therefore, it is possible to improve the durability of the shaft member and the gear member, suppress a decrease in slip torque between the shaft member and the gear member, and obtain stable slip torque. Further, since the resin material can ensure the frictional force when sliding, slip torque can be obtained by the frictional resistance between the resin materials. Therefore, for example, there is no need to form a spring structure or the like on the gear member to obtain slip torque. Therefore, slip torque can be obtained with a simple configuration.
Therefore, it is possible to provide a timepiece gear that can stably maintain slip torque with a simple configuration.

Further, in the timepiece gear, the shaft member includes a shaft main body formed of a metal material, and an external fitting part formed of a resin material and provided integrally with the shaft main body on an outer peripheral part of the shaft main body. have

According to this configuration, since the shaft body of the shaft member is formed of a metal material, the strength of the shaft member can be improved compared to a case where the entire shaft member is formed of a resin material. As a result, the fixing strength of the minute hand can be improved, for example, when the minute hand is attached to the shaft member. Since the external fitting part is provided integrally with the shaft main body on the outer peripheral part of the shaft main body, a sliding part can be provided between the external fitting part and the gear member. In other words, the outer fitting portion made of resin and the gear member can be slid against each other. Therefore, with a simple configuration, it is possible to provide a timepiece gear that achieves both stabilization of slip torque and high strength of the shaft member. Further, by providing an outer fitting part on the outer circumference of the shaft body using insert molding, for example, the metal shaft body and the resin outer fitting part can be easily integrated. Furthermore, since there is no need to perform cutting or the like to form a complicated shape on the outer peripheral portion of the shaft body, the number of steps and manufacturing cost related to manufacturing the shaft member can be reduced.

Further, in the timepiece gear, the shaft member has a shaft main body formed of a metal material, and an external fitting part provided integrally with the shaft main body on an outer peripheral part of the shaft main body, and the external fitting part The part includes a pinion part having external teeth and made of a metal material, and a mounting part made of a resin material and provided at a position corresponding to the sliding part.

According to this configuration, of the external fitting part, the pinion part that fits with other gear members etc. is formed of a metal material, so the strength of the pinion part is higher than when the pinion part is formed of a resin material. can be increased. By forming only the mounting portion of the shaft member that corresponds to the sliding portion from a resin material, the shaft member can be formed using a minimum amount of resin material. Therefore, the strength of the shaft member can be improved while maintaining stable slip torque.

Further, in the timepiece gear, the gear member is in contact with the entire outer circumference of the shaft member.

According to this configuration, since the gear member contacts the entire outer circumference of the shaft member, a more stable frictional force is secured than when the gear member contacts a part of the outer circumference of the shaft member. can. Therefore, slip torque between the shaft member and the gear member can be stably applied. Furthermore, since the contact area between the gear member and the shaft member increases, it is possible to suppress the shaft wobbling of the shaft member with respect to the gear member.

Further, in the timepiece gear, the gear member is formed of a metal material and includes an annular gear body forming an outer circumference of the gear, and a resin material and having a gear body and a ring-shaped gear body formed of a resin material and an inner circumference of the gear body. It has an inner cylinder part that is integrally provided and into which the shaft member is inserted.

According to this configuration, the gear member includes a gear body made of metal and an inner cylinder part made of resin. Since the gear body forms the outer periphery of the gear member, by forming the gear external teeth on the metal gear body, meshing with other gears can be improved and power can be efficiently transmitted. The inner cylinder part is provided integrally with the gear body, and the shaft member is inserted into the inner peripheral part of the inner cylinder part. Thereby, the inner cylinder made of resin can be arranged at a position corresponding to the sliding part. Particularly, when the inner cylindrical portion is provided on the inner circumference of the gear body by insert molding or the like, the metal gear body and the resin inner cylindrical portion can be easily integrated. Therefore, the resin materials in the shaft member and the gear member can be made to slide against each other with a simple configuration.

A movement according to one embodiment of the present invention includes the above-mentioned timepiece gear.

According to this configuration, since the above-described timepiece gear is provided, slip torque between the gear member and the shaft member can be stably maintained in various gear mechanisms within the movement.
Therefore, with a simple configuration, it is possible to provide a high-performance movement that includes a timepiece gear that can stably maintain slip torque.

A timepiece according to one embodiment of the present invention includes the above-described movement.

According to this configuration, since the above-mentioned high-performance movement is provided, the operation of the timepiece can be stabilized, and durability can be improved.
Therefore, with a simple configuration, it is possible to provide a timepiece with excellent stability and durability, which includes a timepiece gear that can stably maintain slip torque.

According to the present invention, it is possible to provide a timepiece gear capable of stably maintaining slip torque with a simple configuration, a movement and a timepiece equipped with this timepiece gear.

FIG. 1 is an external view of a watch according to a first embodiment. FIG. 1 is a plan view of the movement according to the first embodiment, viewed from the front side. FIG. 1 is a sectional view of a timepiece gear according to a first embodiment. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3; FIG. 2 is an explanatory diagram showing a state in which metal material is plated in insert molding according to the first embodiment. FIG. 4 is an explanatory diagram showing how fine particles are removed from plating in insert molding according to the first embodiment. FIG. 2 is an explanatory diagram showing how a metal material and a resin material are integrated in insert molding according to the first embodiment. A sectional view of a timepiece gear according to a second embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, components having the same or similar functions are given the same reference numerals. Further, redundant explanations of these configurations may be omitted.

(First embodiment)
(clock)
FIG. 1 is an external view of a timepiece 1 according to the first embodiment.
The watch 1 is, for example, a wristwatch. A watch 1 includes a movement 4, a dial 5 having scales indicating time information, and various hands (an hour hand 6, a minute hand 7, and a second hand 8) in a watch case 3 having a case lid and a glass 2 (not shown). etc. are incorporated into the system.

(movement)
FIG. 2 is a plan view of the movement 4 according to the first embodiment, viewed from the front side. In FIG. 2, in order to make the drawing easier to read, some of the various parts constituting the movement 4 are omitted, and the various parts are shown in a simplified manner. In addition, in the following explanation, the glass 2 side (dial 5 side, see Fig. 1) of the watch case 3 (see Fig. 1) with respect to the main plate 9 that constitutes the substrate of the movement 4 will be referred to as the "back side" of the movement 4. , the case lid side (the side opposite to the dial 5) is referred to as the "front side" of the movement 4.
The movement 4 includes a main plate 9, a front gear train 11 having one or more timepiece gears 15, and an escapement governor 12.

The front wheel train 11 has a plurality of (three in this embodiment) timepiece gears 15 . Specifically, the front wheel train 11 includes a barrel wheel 13, a second wheel & pinion 16 as a clock gear 15, a third wheel & pinion 17, and a fourth wheel & pinion 18.
The barrel wheel 13 is pivotally supported between the main plate 9 and a barrel holder (not shown), and houses a mainspring (power source) (not shown) inside. The mainspring is wound up by the rotation of the ratchet wheel 14. The ratchet wheel 14 is rotated by the rotation of a winding stem (not shown) connected to the crown 10 via a winding gear train (also not shown).

The second wheel & pinion 16, the third wheel & pinion 17, and the fourth wheel & pinion 18 are pivotally supported between the main plate 9 and a train wheel bridge (not shown). When the barrel wheel 13 rotates due to the elastic restoring force of the wound mainspring, the second wheel & pinion 16, the third wheel & pinion 17, and the fourth wheel & pinion 18 rotate in order based on this rotation.

The center wheel & pinion 16 meshes with the barrel wheel 13 and rotates based on the rotation of the barrel wheel 13. When the center wheel & pinion 16 rotates, a cylinder pinion (not shown) rotates based on this rotation. A minute hand 7 (see FIG. 1) is attached to the cylinder pinion, and the minute hand 7 displays "minutes" by rotation of the cylinder pinion. The minute hand 7 rotates at a rotational speed controlled by the escapement governor 12, that is, once in one hour.

When the center wheel and pinion 16 rotates, a minute wheel (not shown) rotates based on this rotation, and an hour wheel (not shown) rotates based on the rotation of the minute wheel. Note that the hour wheel and hour wheel are parts that constitute the front wheel train 11. An hour hand 6 (see FIG. 1) is attached to the hour wheel, and the hour hand 6 indicates "hour" by rotation of the hour wheel. The hour hand 6 rotates at a rotational speed controlled by the escapement governor 12, for example, once every 12 hours.

The third wheel & pinion 17 meshes with the center wheel & pinion 16 and rotates based on the rotation of the center wheel & pinion 16. The fourth wheel & pinion 18 meshes with the third wheel & pinion 17, and rotates based on the rotation of the third wheel & pinion 17. A second hand 8 (see FIG. 1) is attached to the fourth wheel 18, and the second hand 8 displays "seconds" based on the rotation of the fourth wheel 18. The second hand 8 rotates at a rotational speed controlled by the escapement governor 12, for example, once every minute. Note that the front wheel train 11 may have a configuration in which an intermediate wheel is provided between the fourth wheel & pinion 18 and the escape wheel 41 in the escapement governor 12.

The escape wheel 41 of the escapement governor 12 meshes with the fourth wheel & pinion 18 . As a result, the power (rotational energy) from the mainspring housed in the barrel wheel 13 is transmitted to the escape wheel 41 mainly via the second wheel & pinion 16, third wheel & pinion 17, and fourth wheel & pinion 18. Ru.

(Clock gear)
Next, the configuration of the timepiece gear 15 (second wheel & pinion 16) provided in the front wheel train 11 will be described in detail. The second wheel & pinion 16, the third wheel & pinion 17, and the fourth wheel & pinion 18 have the same configuration except for the gear module, diameter, etc. Therefore, in the following description, the configuration of the second wheel & pinion 16 will be explained, and explanations of the configurations of the third wheel & pinion 17 and the fourth wheel & pinion 18 that overlap with the second wheel & pinion 16 may be omitted. Further, in the following description, the center wheel 16 may be referred to as a clock gear 15.

FIG. 3 is a sectional view of the timepiece gear 15 according to the first embodiment. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. In FIG. 4, the shape of the outer peripheral portion of the gear member 30 is shown in a simplified manner.
As shown in FIG. 3, the timepiece gear 15 includes a shaft member 20 and a gear member 30.
At least a portion of the shaft member 20 is made of a resin material. Specifically, the shaft member 20 includes a shaft body 21 made of a metal material and an external fitting part 22 made of a resin material.

The shaft body 21 is provided coaxially with the rotation center axis C (see also FIG. 2) of the timepiece gear 15. The shaft body 21 is formed into a cylindrical shape centered on the rotation center axis C. The shaft body 21 is made of a metal material such as carbon steel such as S100C or stainless steel. In the following description, the direction along the rotation center axis C of the shaft body 21 is sometimes referred to as the axial direction, the direction orthogonal to the axial direction is sometimes referred to as the radial direction, and the direction around the axial direction is sometimes referred to as the circumferential direction.

The external fitting portion 22 is provided on the outer peripheral portion of the shaft body 21. The outer fitting portion 22 is made of a resin material such as polyacetal, polycarbonate, polyphenylene ether, polypropylene, polyarylate, polybutylene terephthalate, or the like. In this embodiment, the entire outer fitting portion 22 is formed of a resin material. The external fitting portion 22 is provided integrally with the shaft body 21 by insert molding. The external fitting part 22 has a mounting part 23 and a pinion part 24.

The attachment portion 23 is formed in an annular shape that is coaxial with the shaft body 21 . The outer circumferential surface 23a of the attachment portion 23 has a circular cross-sectional shape perpendicular to the rotation center axis C when viewed from the axial direction (see also FIG. 4). The outer peripheral surface 23a of the attachment portion 23 is inclined such that the diameter of the attachment portion 23 increases from the back side toward the front side in the axial direction. A first step portion 26, which is a component of the external fitting portion 22, is provided at the front end of the attachment portion 23 in the axial direction. The first step portion 26 is formed in an annular shape coaxial with the shaft body 21 . The outer diameter of the first step portion 26 is smaller than the outer diameter of the attachment portion 23 . The first stage portion 26 and the attachment portion 23 are integrally formed so as to be in contact with each other in the axial direction.

The pinion portion 24 is provided on the back side of the mounting portion 23 in the axial direction. The pinion part 24 is provided integrally with the attachment part 23. The pinion portion 24 is provided coaxially with the shaft body 21. The pinion portion 24 has pinion external teeth 25 (external teeth in the claims) on the outer periphery. The pinion portion 24 meshes with the barrel wheel 13 (see FIG. 2). The outer diameter of the pinion part 24 is larger than the outer diameter of the attachment part 23. More specifically, the diameter of the circle (bottom circle) connecting the base ends of the external pinion teeth 25 in the pinion part 24 is larger than the outer diameter of the attachment part 23 . The thickness of the pinion portion 24 along the axial direction is thicker than the thickness of the attachment portion 23 along the axial direction. The pinion portion 24 and the attachment portion 23 are integrally formed so as to be in contact with each other in the axial direction.

A second step portion 27, which is a component of the external fitting portion 22, is provided at the back end of the pinion portion 24 in the axial direction. The second step portion 27 is formed in an annular shape coaxial with the shaft body 21 . The outer diameter and thickness of the second step portion 27 are equal to the outer diameter and thickness of the first step portion 26. In other words, the outer diameter of the second step portion 27 is smaller than the diameter of the root circle in the pinion portion 24 . The second step portion 27 and the pinion portion 24 are integrally formed so as to be in contact with each other in the axial direction.

In a state where the shaft body 21 and the external fitting part 22 are integrated, both ends of the shaft body 21 protrude outward in the axial direction from the first step part 26 and the second step part 27 of the external fitting part 22, respectively. There is. That is, the length of the shaft body 21 along the axial direction is longer than the length of the outer fitting portion 22 along the axial direction. The external fitting portion 22 is provided at the center of the shaft body 21 in the axial direction. A minute hand 7 (see FIG. 1) is attached to the end of the shaft member 20 formed in this manner on the back side (on the pinion portion 24 side) via a cylinder pinion (not shown). The cylinder pinion is press-fitted and fixed, for example, to the back end of the shaft body 21 in the axial direction.

The gear member 30 is arranged on the outer periphery of the shaft member 20. The gear member 30 is provided coaxially with the rotation center axis C of the timepiece gear 15. The gear member 30 is formed into a disk shape whose thickness direction is in the axial direction of the rotation center axis C. The shaft member 20 passes through the center of the gear member 30 when viewed from the axial direction. The gear member 30 is provided so as to be slidable in the circumferential direction with respect to the shaft member 20 with the shaft member 20 penetrating therethrough. At least a portion of the gear member 30 is made of a resin material. Specifically, the gear member 30 includes a gear body 31 made of a metal material and an inner cylinder part 32 made of a resin material.

The gear body 31 constitutes the outer peripheral portion of the gear member 30. The gear body 31 is formed in an annular shape coaxial with the rotation center axis C. Gear external teeth 33 are formed on the outer periphery of the gear body 31 . The external gear teeth 33 mesh with the pinion gear of the third wheel 17 (see FIG. 2). The gear body 31 is made of a metal material such as brass or a manganese-nickel alloy.

The inner cylinder portion 32 is provided at the inner peripheral portion of the gear body 31. The inner cylindrical portion 32 is formed into a cylindrical shape coaxial with the rotation center axis C. The inner cylinder portion 32 is made of a resin material such as polyacetal, polycarbonate, polyphenylene ether, polypropylene, polyarylate, polybutylene terephthalate, or the like. The inner cylinder portion 32 is provided integrally with the gear body 31 by insert molding.

The inner peripheral portion of the inner cylinder portion 32 is formed into a circular shape when viewed from the axial direction (see also FIG. 4). The mounting portion 23 of the shaft member 20 is inserted into the inner peripheral portion of the inner cylinder portion 32 . The inner diameter of the inner cylindrical portion 32 is smaller than the outer diameter of the outermost portion (the portion with the largest outer diameter) of the attachment portion 23 of the shaft member 20, and is located at the rearmost portion of the attachment portion 23 of the shaft member 20. Larger than the outer diameter of the part (the part with the smallest outer diameter). The inner peripheral portion of the inner cylinder portion 32 is a sliding portion 34 that is slidable with respect to the shaft member 20. The gear member 30 contacts the shaft member 20 inserted into the inner cylinder part 32 in the radial direction at the sliding part 34 . Specifically, the sliding portion 34 contacts the outer circumferential surface 23 a of the attachment portion 23 of the outer fitting portion 22 of the shaft member 20 . As a result, the resin members of the shaft member 20 and the gear member 30 are in contact with each other at the sliding portion 34 . In the axial direction, the back end of the mounting portion 23 and the back end of the inner cylinder portion 32 are flush with each other. In the axial direction, the front end of the mounting portion 23 projects further toward the front than the front end of the inner cylinder portion 32 . The pinion portion 24 of the shaft member 20 is in contact with the inner cylinder portion 32 and the back end surface of the gear body 31 in the axial direction. As shown in FIG. 4, the inner cylinder part 32 of the gear member 30 contacts the outer peripheral surface 23a of the attachment part 23 of the shaft member 20 over the entire circumference at the front end.

In the shaft member 20 and gear member 30 formed in this way, when a torque difference of a predetermined value or more occurs between the shaft member 20 and the gear member 30, the resin members slide (slip) against each other in the sliding portion 34. . Further, when the torque difference generated between the shaft member 20 and the gear member 30 is less than or equal to a predetermined value, the shaft member 20 and the gear member 30 rotate together around the rotation axis.

Next, in the above-described shaft member 20 and gear member 30, a part formed of a metal material (for example, the shaft body 21) and a part formed of a resin material (for example, the outer fitting part 22) are integrally formed. This section explains the insert molding procedure. In the following description, a procedure for integrally forming the shaft member 20 and the external fitting portion 22 of the shaft member 20 by insert molding will be described as an example. The gear main body 31 and the inner cylinder part 32 of the gear member 30 are integrally formed by the same procedure as the shaft member 20 and the external fitting part 22 of the shaft member 20.

FIG. 5 is an explanatory diagram showing the state of plating a metal material in insert molding according to the first embodiment. FIG. 6 is an explanatory diagram showing how fine particles 51 are removed from plating in insert molding according to the first embodiment. FIG. 7 is an explanatory diagram showing how a metal material and a resin material are integrated in insert molding according to the first embodiment.

As shown in FIG. 5, in the insert molding procedure, first, plating 50 containing fine particles 51 is applied to the outer surface of shaft body 21 formed of a metal material. Examples of the material of the base material of the plating 50 include nickel, boron, phosphorus, copper, silver, gold, lead, and alloys thereof. The thickness of the plating 50 is more than twice the diameter of the fine particles 51 contained therein. In this embodiment, the diameter of the fine particles 51 is 0.1 μm or more and 0.5 μm or less. As the material for the fine particles 51, a material having a melting point lower than that of the base material is used. Specifically, examples of the material of the fine particles 51 include fluorine-based or acrylic resin materials, and metal materials such as tin, antimony, and zinc.

As shown in FIG. 6, the shaft member 20 coated with the plating 50 is then heated by laser irradiation or the like. The heating temperature at this time is set higher than the melting point of the fine particles 51 and lower than the melting point of the base material of the plating 50. As a result, only the fine particles 51 in the plating 50 are melted or sublimated and removed. Therefore, a plurality of minute irregularities 52 are formed on the outer surface of the plating 50 due to the removal of the fine particles 51.

As shown in FIG. 7, after the unevenness 52 is formed on the outer surface of the shaft body 21, injection molding is performed to form the outer fitting part 22. At this time, the resin that is the material of the outer fitting part 22 enters the unevenness 52 on the outer surface of the shaft body 21, so that the metal shaft body 21 and the resin outer fitting part 22 are firmly connected. Therefore, the metal shaft body 21 and the resin outer fitting part 22 are integrated.

Returning to FIG. 2, the timepiece gear 15 formed in this manner is used as the second wheel & pinion 16 of the front wheel train 11.
The fourth wheel 18 meshes with the escape wheel 41 of the escapement governor 12. The escapement governor 12 includes an escape wheel 41, an anchor 42, and a balance bridge unit 43. The anchor 42 causes the escape wheel 41 to escape. The balance receiver unit 43 includes a balance 44 that operates regularly at a constant cycle. The operation of the balance wheel 44 is transmitted to the front wheel train 11 via the balance bridge unit 43, pallet pallet wheel 42, and escape wheel 41. The car 18) rotates regularly at a constant period.

Next, the functions and effects of the timepiece gear 15, movement 4, and timepiece 1 described above will be explained.
According to the timepiece gear 15 of this embodiment, the resin materials slide against each other in the sliding portion 34 where the gear member 30 and the shaft member 20 slide against each other in the radial direction. Thereby, wear of the resin material can be suppressed compared to the conventional technique in which the metal material and the resin material slide against each other in the sliding portion 34. Therefore, it is possible to improve the durability of the shaft member 20 and the gear member 30, suppress a decrease in slip torque between the shaft member 20 and the gear member 30, and obtain stable slip torque. Further, since the resin material can ensure the frictional force when sliding, slip torque can be obtained by the frictional resistance between the resin materials. Therefore, for example, there is no need to form a spring structure or the like on the gear member 30 to obtain slip torque. Therefore, slip torque can be obtained with a simple configuration.
Therefore, with a simple configuration, it is possible to provide the timepiece gear 15 that can stably maintain slip torque.

Since the shaft body 21 of the shaft member 20 is formed of a metal material, the strength of the shaft member 20 can be improved compared to a case where the entire shaft member 20 is formed of a resin material. Thereby, the fixing strength of the minute hand 7 when attaching the minute hand 7 to the shaft member 20 can be improved, for example. Since the external fitting part 22 is provided integrally with the shaft main body 21 on the outer peripheral part of the shaft main body 21, a sliding part 34 can be provided between the external fitting part 22 and the gear member 30. In other words, the outer fitting portion 22 and the gear member 30 made of resin can be slid against each other. Therefore, with a simple configuration, the timepiece gear 15 can achieve both stabilization of slip torque and high strength of the shaft member 20. Further, by providing the outer fitting portion 22 on the outer peripheral portion of the shaft body 21 using insert molding, for example, the metal shaft body 21 and the resin outer fitting portion 22 can be easily integrated. Further, since there is no need to perform cutting or the like to form a complicated shape on the outer circumferential portion of the shaft body 21, the number of steps and manufacturing cost related to manufacturing the shaft member 20 can be reduced.

Since the gear member 30 is in contact with the entire outer circumference of the shaft member 20, a more stable frictional force can be ensured compared to the case where the gear member 30 is in contact with a part of the outer circumference of the shaft member 20. Therefore, slip torque between the shaft member 20 and the gear member 30 can be stably applied. Furthermore, since the contact area between the gear member 30 and the shaft member 20 increases, axial wobbling of the shaft member 20 with respect to the gear member 30 can be suppressed.

The gear member 30 has a gear main body 31 made of metal and an inner cylinder part 32 made of resin. Since the gear body 31 forms the outer periphery of the gear member 30, the gear external teeth 33 are formed on the metal gear body 31, thereby making it possible to mesh well with other gears and efficiently transmit power. . The inner cylindrical portion 32 is provided integrally with the gear body 31 , and the shaft member 20 is inserted into the inner peripheral portion of the inner cylindrical portion 32 . Thereby, the inner cylinder part 32 made of resin can be arranged at a position corresponding to the sliding part 34. In particular, when the inner cylindrical portion 32 is provided on the inner circumference of the gear body 31 by insert molding or the like, the metal gear body 31 and the resin inner cylindrical portion 32 can be easily integrated. Therefore, the resin materials in the shaft member 20 and the gear member 30 can be made to slide against each other with a simple configuration.

Since the movement 4 of this embodiment includes the above-described timepiece gear 15, the slip torque between the gear member 30 and the shaft member 20 can be stably maintained in various gear mechanisms within the movement 4.
Therefore, with a simple configuration, it is possible to provide a high-performance movement 4 that includes a timepiece gear 15 that can stably maintain slip torque.

According to the timepiece 1 of this embodiment, since the above-mentioned high-performance movement 4 is provided, the operation of the timepiece 1 can be stabilized, and durability can be improved.
Therefore, with a simple configuration, it is possible to provide a timepiece 1 with excellent stability and durability, which includes a timepiece gear 15 that can stably maintain slip torque.

(Second embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 8 is a sectional view of the timepiece gear 15 according to the second embodiment. The second embodiment differs from the above-described first embodiment in that a part of the outer fitting portion 222 of the shaft member 220 is formed of a metal material.

As shown in FIG. 8, the external fitting part 222 of the shaft member 220 in the second embodiment has a mounting part 223 formed of a resin material and a pinion part 224 formed of a metal material. The shapes of the attachment portion 223 and the pinion portion 224 in the second embodiment are the same as the shapes of the attachment portion 23 and the pinion portion 24 in the first embodiment (see FIG. 3).
The pinion portion 224 is formed integrally with the shaft body 21. The pinion portion 224 is formed integrally with the shaft body 21 by cutting out a single metal member, for example, by cutting. The attachment portion 223 is provided integrally with the shaft body 21 and the pinion portion 224 by insert molding.

According to the second embodiment, the pinion part 224 of the external fitting part 222 that fits with the other gear member 30 etc. is formed of a metal material, so compared to the case where the pinion part 224 is formed of a resin material. As a result, the strength of the pinion portion 224 can be increased. By forming only the mounting portion 223 of the shaft member 220 that corresponds to the sliding portion 34 from a resin material, the shaft member 220 can be formed using a minimum amount of resin material. Therefore, the strength of the shaft member 220 can be improved while maintaining stable slip torque.

Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the gear member 30 is configured to be in contact with the entire outer circumference of the shaft member 20, but the present invention is not limited to this. For example, when the outer circumference of the mounting portion 23 of the shaft member 20 is formed to have a circular cross-section, the shape of the inner circumference of the sliding portion 34 of the gear member 30 (the inner circumference of the inner cylinder portion 32 as seen from the axial direction) The shape of the portion may be formed to have a polygonal cross section. The inner peripheral portion of the sliding portion 34 of the gear member 30 may be provided with a plurality of protrusions that are convex toward the inside in the radial direction (toward the shaft member 20 side), for example.
On the other hand, for example, when the shape of the inner peripheral part of the sliding part 34 of the gear member 30 is formed in a circular cross-section, the shape of the outer peripheral part of the mounting part 23 of the shaft member 20 is, for example, polygonal when viewed from the axial direction. It may be formed into a shape. A plurality of protrusions may be provided on the outer circumference of the attachment portion 23 of the shaft member 20, for example, protruding outward in the radial direction (toward the gear member 30 side).

The resin material, the metal material, the material of the plating 50, and the material of the fine particles 51 are not limited to the embodiments described above. The resin material may be, for example, a resin material containing synthetic fibers.
The diameter of the outer peripheral portion of the attachment portion 23 may be constant along the axial direction.

When the timepiece gear 15 is arranged in the movement 4, the front and back directions of the pinion part 24 and the mounting part 23 may be reversed from those in the above-described embodiment. The number of timepiece gears 15 included in the front wheel train 11 is not limited to the number in the embodiment described above.
In the above embodiment, the second wheel 16 of the front wheel train 11 is the clock gear 15, but the third wheel 17 and the fourth wheel 18 may be the clock gear 15. That is, the configuration of the clock gear 15 described above may be applied to the third wheel & pinion 17 and the fourth wheel & pinion 18.

In addition, the components in the embodiments described above can be replaced with known components as appropriate without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

1 Clock 4 Movement 15 Clock gears 20, 220 Shaft member 21 Shaft body 22, 222 External fitting portion 23, 223 Mounting portion 24, 224 Pinion portion 25 Pinion external teeth (external teeth)
30 Gear member 31 Gear body 32 Inner cylinder part 34 Sliding part

Claims (6)

a shaft member at least partially formed of a resin material;
At least a portion thereof is formed of a resin material, and has a sliding portion that is provided so as to be slidable with respect to the shaft member with the shaft member penetrating therethrough, and in which the resin materials are in contact with the shaft member in the radial direction. a gear member;
Equipped with
The gear member is
an annular gear body formed of a metal material and forming the outer periphery of the gear;
an inner cylindrical part formed of a resin material, provided integrally with the gear main body at an inner peripheral part of the gear main body, and into which the shaft member is inserted;
has
The shaft member is in contact with an end surface of the inner cylinder portion and the gear body in the axial direction.
Clock gears. The shaft member is
A shaft body formed of a metal material,
an external fitting part formed of a resin material and provided integrally with the shaft main body on the outer periphery of the shaft main body;
The timepiece gear according to claim 1, comprising: The shaft member is
A shaft body formed of a metal material,
an external fitting portion provided integrally with the shaft body on an outer peripheral portion of the shaft body;
has
The external fitting part is
a pinion portion having external teeth and formed of a metal material;
a mounting portion provided at a position corresponding to the sliding portion and formed of a resin material;
The timepiece gear according to claim 1, comprising: The timepiece gear according to any one of claims 1 to 3, wherein the gear member contacts the entire outer circumference of the shaft member. A movement comprising the timepiece gear according to any one of claims 1 to 4 . A timepiece comprising the movement according to claim 5 .

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