Temperature-compensated balance spring system, movement and timepiece

Abstract

Provided is a temperature-compensated balance spring system capable of suppressing deformation of a bimetallic portion and improving temperature compensation performance. A temperature-compensated balance spring system (1) includes a balance spring system main body (30), an adjustment portion (50), and a restriction portion (70). The balance spring system main body (30) has a balance shaft (31) extending along a first axis (O1) and rotates about the first axis (O1). The adjustment portion (50) is cantilevered supported along a second axis (O2) from a position of the balance spring system main body (30) that is rotationally symmetrical about the first axis (O1), and has a bimetallic portion (52) in which materials having different thermal expansion rates are stacked in a direction intersecting the second axis (O2). The restriction portion (70) is provided at a position corresponding to a free end (60) of the adjustment portion (50) and restricts movement of the adjustment portion (50) with a gap of 0 mm or more with respect to a range of movement of the bimetallic portion (52) at a use temperature.

Description

Technical Field

[0001] This invention relates to a temperature-compensated balance wheel and hairspring system, a movement, and a timepiece. Background Technology

[0002] Previously, the following structure of a balance wheel and hairspring system was disclosed: a balance shaft extending along an axis, a balance wheel fixed to the balance shaft, and a hairspring, which function as a regulator for a mechanical watch. Various techniques have been proposed for the balance wheel and hairspring system to suppress changes in the rate (step) (the degree to which the watch runs slow or fast) of a mechanical watch due to temperature variations.

[0003] For example, Patent Document 1 discloses the following configuration of a temperature-compensated balance wheel and hairspring system: Inside the balance wheel and hairspring system, there is a bimetallic unit comprising two types of components with different coefficients of thermal expansion. One end of the bimetallic unit is fixed to the spoke portion of the balance wheel, while the other end remains free. According to the technology described in Patent Document 1, by adjusting the bending of the bimetallic unit in response to temperature changes, a temperature compensation function that reduces the impact of temperature variations can be achieved. Furthermore, by providing a counterweight at the other end of the bimetallic unit (the free end side), the correction amount can be increased.

[0004] [Prior Technology Documents] [Patent Literature] [Patent Document 1] Japanese Patent No. 6275299. Summary of the Invention

[0005] [The problem the invention aims to solve] However, in the technology described in Patent Document 1, the bimetallic unit is a cantilever structure. Therefore, when an impact is applied due to the dropping of a clock, stress is applied to the fixed part (base end) of the bimetallic unit, and the bimetallic unit may deform. If the bimetallic unit deforms, proper temperature compensation cannot be performed, and the clock's differential may deviate.

[0006] As countermeasures to the aforementioned impacts, one could consider reducing the weight of the counterweight at the free end or increasing the strength of the bimetal itself. However, reducing the weight might decrease the correction amount, making it impossible to adequately correct for temperature changes. Conversely, increasing the strength of the bimetal itself by making the construction more robust could lead to an increase in the weight of the balance wheel and hairspring system relative to the inertial torque of the balance wheel and hairspring system, resulting in imbalances such as leveling errors.

[0007] Therefore, in the prior art, there are challenges in suppressing the deformation of the bimetallic part and improving the temperature compensation performance in temperature-compensated balance wheel and hairspring systems.

[0008] Therefore, the object of the present invention is to provide a temperature-compensated balance spring system capable of suppressing deformation of the bimetallic part and improving temperature compensation performance, and a movement and watch equipped with the temperature-compensated balance spring system.

[0009] [Solutions for solving the problem] To address the aforementioned issues, one aspect of the present invention relates to a temperature-compensated balance wheel and hairspring system comprising: a balance wheel and hairspring system body having a balance shaft extending along a first axis, which rotates about the first axis by the power of the hairspring; an adjustment section having a position that is rotationally symmetrical about the first axis from the balance wheel and hairspring system body and cantilevered along a second axis, and having a bimetallic section made of materials with different coefficients of thermal expansion stacked in a direction intersecting the second axis; and a limiting section having a position corresponding to the free end of the adjustment section and limiting the movement of the adjustment section with a gap of 0 mm or more relative to the movement range of the bimetallic section at a predetermined operating temperature.

[0010] According to this design, as temperature changes, the bimetallic part of the adjustment section deforms, thereby changing the average diameter of the main body of the balance wheel and hairspring system. This allows for the correction of the temperature characteristics of the inertial torque. As a result, the oscillation period of the balance wheel and hairspring system can be kept constant, resulting in a balance wheel and hairspring system with excellent temperature compensation characteristics. Furthermore, the adjustment section extends cantilevered, thus ensuring the amount of radial deformation that changes with temperature, and increasing the temperature correction amount based on the bimetallic part.

[0011] A limiting part is provided at the position corresponding to the free end of the adjusting part. Therefore, even when the balance wheel and hairspring system is impacted due to falling objects, the movement of the free end of the adjusting part is restrained by the limiting part, thus suppressing deformation of the bimetallic part. As a result, compared with the prior art, accurate temperature compensation can be achieved even when impacted, suppressing timekeeping deviations. Furthermore, there is no need to lighten the counterweight as a countermeasure against impacts, thus eliminating the constraint of counterweight weight and ensuring a large temperature correction amount. Moreover, there is no need to increase the strength of the bimetallic part as a countermeasure against impacts, thus reducing constraints on the bimetallic material (Young's modulus, allowable stress, etc.) and increasing the freedom of material selection. In other words, the design can be carried out only considering the coefficient of thermal expansion. Therefore, high-precision temperature compensation performance can be achieved. In addition, compared with increasing the strength of the bimetallic part, the weight of the balance wheel and hairspring system can be suppressed, thus suppressing the generation of balance errors.

[0012] Therefore, it is possible to provide a temperature-compensated balance wheel and hairspring system that can suppress deformation of the bimetallic part and improve temperature compensation performance.

[0013] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the main body of the aforementioned balance wheel and hairspring system includes: the aforementioned balance shaft; and a balance wheel, which has a rim portion surrounding the aforementioned balance shaft from the outer side of the aforementioned first axis in the radial direction, and is mounted on the aforementioned balance shaft. In a top view viewed from the aforementioned first axis, the aforementioned second axis is a straight line intersecting the aforementioned rim portion, and the aforementioned adjustment portion extends from the aforementioned rim portion toward the inner side of the aforementioned rim portion.

[0014] According to this design, the adjustment section is located on the rim of the balance wheel, thus allowing it to be moved radially away from the first axis. This increases the radial deformation of the adjustment section and the temperature coefficient correction based on the bimetallic section. Furthermore, the second axis is located inside the rim, thus ensuring the radial deformation in response to temperature changes while suppressing the increase in the size of the balance wheel and hairspring system that accompanies the addition of the adjustment section.

[0015] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned limiting part includes a free end insertion part, which is formed on the aforementioned wheel rim along the aforementioned second axis and is for the aforementioned free end of the aforementioned adjusting part to be inserted.

[0016] According to this design, a limiting part is provided in the rim section, thereby suppressing the increase in the number of parts and the increase in the weight of the balance wheel and hairspring system caused by the provision of the limiting part. By inserting the free end of the adjusting part into the free end insertion part formed in the rim section, the movement of the free end of the adjusting part can be restricted. Therefore, deformation of the adjusting part during impact can be suppressed with a simple structure.

[0017] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned wheel rim has a mounting hole for fixing one end of the aforementioned adjustment part, and is formed in such a way that the inner diameter of the aforementioned mounting hole is the same as the inner diameter of the aforementioned free end insertion part.

[0018] According to this solution, the mounting hole and the free end insertion portion formed on the rim can be formed simultaneously. Alternatively, the mounting hole and the free end insertion portion can be formed using the same tool. Therefore, the workability during manufacturing can be improved.

[0019] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned adjustment part has a counterweight installed on the aforementioned free end side of the aforementioned bimetallic part. The aforementioned counterweight has a main body installed on the aforementioned bimetallic part and an end part with an outer diameter smaller than the aforementioned main body. The aforementioned end part of the aforementioned counterweight is inserted into the aforementioned free end insertion part of the aforementioned limiting part.

[0020] According to this scheme, by adding a counterweight, the weight of the adjustment part can be increased, thereby increasing the temperature correction amount based on the bimetallic part. Furthermore, by inserting the end of the counterweight, which has a small outer diameter, into the free end insertion part, the inner diameter of the free end insertion part can be reduced. Therefore, particularly when the free end insertion part is formed in the rim portion, it is possible to suppress the decrease in rim strength while simultaneously achieving excellent temperature compensation performance.

[0021] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned limiting part is formed in such a way that it has a gap corresponding to a predetermined temperature change of 0 degrees to 30 degrees relative to the predetermined operating temperature, or a gap of 0 mm to 0.1 mm relative to the movement range of the aforementioned bimetallic part at the predetermined operating temperature.

[0022] According to this design, the size of the gap can be appropriately set relative to the swing amplitude of the adjustment part at the intended operating temperature. Therefore, deformation during impact can be suppressed, while simultaneously achieving effective temperature compensation performance.

[0023] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned adjustment part has a recessed portion along the aforementioned second axis at the end of the aforementioned free end side, and the aforementioned limiting part includes a protrusion inserted into the aforementioned recessed portion.

[0024] According to this design, a limiting part can be provided in the balance wheel and hairspring system without forming holes or recesses, thereby suppressing the decrease in strength of the balance wheel and hairspring system caused by the provision of the limiting part. Therefore, it is possible to suppress the decrease in strength of the balance wheel and hairspring system and the deformation of the bimetallic part, and improve temperature compensation performance.

[0025] In addition, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned limiting part includes a pair of wall parts, which are connected to the main body of the aforementioned balance wheel and hairspring system to restrict the movement of the aforementioned free end of the aforementioned adjusting part in the up-down direction parallel to the aforementioned first axis.

[0026] According to this design, by moving the free ends of a pair of wall constraint adjustment parts in the up-down direction (along the axial direction of the first axis), deformation of the bimetallic part during impact can be suppressed. Therefore, a temperature-compensated balance wheel and hairspring system that can suppress deformation of the bimetallic part and improve temperature compensation performance can be provided. Furthermore, the versatility of the limiting part can be improved.

[0027] In addition, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned limiting part includes a pair of wall portions, which are connected to the main body of the aforementioned balance wheel and hairspring system to restrict the movement of the aforementioned free end of the aforementioned adjusting part in a radial direction intersecting the aforementioned first axis.

[0028] According to this design, by moving the free ends of a pair of wall constraint adjustment parts in the left-right direction (radial direction along the first axis), deformation of the bimetallic part during impact can be suppressed. Therefore, a temperature-compensated balance wheel and hairspring system that can suppress deformation of the bimetallic part and improve temperature compensation performance can be provided. Furthermore, the versatility of the limiting part can be improved.

[0029] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the main body of the aforementioned balance wheel and hairspring system includes: the aforementioned balance shaft; and a balance wheel, which has a rim portion surrounding the aforementioned balance shaft from the outer side of the aforementioned first axis in a radial direction, and a spoke portion extending in a radial direction connecting the aforementioned balance shaft and the aforementioned rim portion, the aforementioned second axis being a curve along the aforementioned rim portion, and the aforementioned rim portion becoming the aforementioned bimetallic portion.

[0030] According to this design, the rim and the bimetallic part (adjustment part) are integrated, thus enabling a simpler configuration.

[0031] Furthermore, in the aforementioned temperature-compensated balance wheel and hairspring system, the aforementioned limiting part is installed on the aforementioned spoke part to restrict the movement of the aforementioned free end in the aforementioned radial direction.

[0032] According to this design, even when the balance wheel and hairspring system is impacted by a drop or other event, the movement of the free end of the adjusting part is constrained by the limiting part, thereby suppressing deformation of the bimetallic part. Therefore, even with an impact, proper temperature compensation can be achieved, suppressing timekeeping deviation. Thus, a temperature-compensated balance wheel and hairspring system that suppresses deformation of the bimetallic part and improves temperature compensation performance can be provided.

[0033] One aspect of the present invention relates to a movement that includes the aforementioned temperature-compensated balance wheel and hairspring system.

[0034] According to this solution, a high-performance movement with a temperature-compensated balance wheel and hairspring system that can suppress deformation of the bimetallic part and improve temperature compensation performance can be provided.

[0035] One aspect of the present invention relates to a watch that includes the aforementioned movement.

[0036] According to this solution, a movement equipped with the aforementioned solution can provide a high-performance timepiece with a temperature-compensated balance wheel and hairspring system that can suppress deformation of the bimetallic part and improve temperature compensation performance.

[0037] [The effects of the invention] According to the present invention, a temperature-compensated balance spring system capable of suppressing deformation of the bimetallic part and improving temperature compensation performance, a movement and a watch equipped with the temperature-compensated balance spring system can be provided. Attached Figure Description

[0038] Figure 1 This is an external view of the clock according to the first embodiment.

[0039] Figure 2 This is a top view of the movement involved in the first embodiment, viewed from the front.

[0040] Figure 3 This is a top view of the balance wheel and hairspring system according to the first embodiment, viewed from the front.

[0041] Figure 4 yes Figure 3 Enlarged view of Part IV.

[0042] Figure 5 It is along Figure 3 A cross-sectional view of the VV line.

[0043] Figure 6 This is a cross-sectional view of the balance wheel and hairspring system according to the second embodiment.

[0044] Figure 7 This is a perspective view of the balance wheel and hairspring system according to the third embodiment.

[0045] Figure 8 This is a perspective view of the balance wheel and hairspring system according to the fourth embodiment.

[0046] Figure 9 This is a perspective view of the balance wheel and hairspring system according to the fifth embodiment. Detailed Implementation

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the following description, components having the same or similar functions will be labeled with the same reference numerals. Also, repeated descriptions of these components will sometimes be omitted. Furthermore, in the figures shown below, for ease of observation, illustrations of some parts of the watchmaking components will sometimes be omitted, and each watchmaking component will be illustrated in a simplified manner.

[0048] (First Embodiment) Figure 1 This is an external view of the clock 2 according to the first embodiment.

[0049] The clock 2 is constructed by fitting the movement 3, dial 4, and various hands 5 to 7 into the clock case 8.

[0050] The watch case 8 comprises a main body, a cover (not shown), and a crystal. At the 3 o'clock position on the side of the main body... Figure 1 On the right side, a rotating handle 9 is provided. The rotating handle 9 is a component for operating the movement 3 from the outside of the housing body. The rotating handle 9 is fixed to a shaft 10 that is inserted into the housing body.

[0051] Figure 2 This is a top view of the movement 3 according to the first embodiment, viewed from the side.

[0052] like Figure 2 As shown, the movement 3 is constructed by supporting multiple gears and the like in a rotatable manner on a base plate 11 that forms the base plate of the movement 3. Furthermore, in the following description, the side of the watch case 8 facing the glass (the side facing the dial 4) is referred to as the "back side" of the movement 3 relative to the base plate 11, and the side facing the case back (the side opposite to the dial 4 side) is referred to as the "face side" of the movement 3. Additionally, in the following description, each gear is arranged with its axial direction in the direction of the back of the movement 3.

[0053] The aforementioned stem 10 is mounted on the base plate 11. The stem 10 is used for date or time correction. The stem 10 is rotatable about its axis and can move in the axial direction. The position of the stem 10 in the axial direction is determined by a switching device (not shown). When the stem 10 is rotated, the small steel wheel 13 and the large steel wheel 14 rotate sequentially via the rotation of the clutch wheel and the upright wheel (both not shown), and the mainspring (not shown) housed in the barrel wheel 15 is wound up.

[0054] The barrel wheel 15 is rotatably supported between the base plate 11 and the barrel clamp plate 28. If the barrel wheel 15 rotates due to the restoring force of the mainspring, the second wheel 16, the third wheel 17, and the fourth wheel 18 rotate sequentially. The barrel wheel 15, the second wheel 16, the third wheel 17, and the fourth wheel 18 constitute the dial wheel train.

[0055] The minute hand 6 is mounted on the second wheel 16 in the watch's side gear train (see reference). Figure 1 The hour wheel (not shown) rotates in conjunction with the rotation of wheel 16, and is equipped with the hour hand 5. Additionally, the second hand 7 (see reference) Figure 1 It is constructed in a manner that rotates based on the rotation of wheel 18.

[0056] The movement 3 is equipped with a regulating escapement 20. The regulating escapement 20 has an escape wheel 21, an escape fork 22, and a temperature-compensated balance wheel and hairspring system 1 (hereinafter, sometimes simply referred to as balance wheel and hairspring system 1).

[0057] The escape wheel 21 is rotatably supported between the base plate 11 and the wheel train clamp. The escape wheel 21 rotates in conjunction with the rotation of the fourth wheel 18.

[0058] The escape fork 22 is supported between the base plate 11 and the escape fork clamp in a reciprocating manner. The escape fork 22 has a pair of pallet sprockets 22a and 22b. The pallet sprockets 22a and 22b alternately engage with the escape gear of the escape wheel 21 as the escape fork 22 reciprocates. When one of the pallet sprockets 22a and 22b engages with the escape gear, the escape wheel 21 temporarily stops rotating. Conversely, when the pallet sprockets 22a and 22b disengage from the escape gear, the escape wheel 21 rotates. By continuously repeating these actions, the escape wheel 21 rotates intermittently. Furthermore, through the intermittent rotation of the escape wheel 21, the aforementioned gear train (the outer gear train) operates intermittently, thereby controlling the rotation of the outer gear train.

[0059] Figure 3 This is a top view of the balance wheel and hairspring system 1 according to the first embodiment, viewed from the side. Figure 4 yes Figure 3 Enlarged view of Part IV. Figure 5 It is along Figure 3 A cross-sectional view of the VV line. Furthermore, in Figure 4 In the illustration, some dimensions (such as the inner diameter of the free end insertion part 71) are exaggerated.

[0060] like Figure 3 and Figure 5 As shown, the balance wheel and hairspring system 1 regulates the speed of the escape wheel 21 (so that the escape wheel 21 escapes at a constant speed). The balance wheel and hairspring system 1 includes a balance wheel and hairspring system body 30, an adjustment part 50, and a limiting part 70.

[0061] The main body 30 of the balance wheel and hairspring system includes a balance shaft 31, a balance wheel 32, and a hairspring 33.

[0062] The balance shaft 31 is supported on the base plate 11 and the balance wheel and hairspring system clamp 29 in a manner that allows it to rotate about the first axis O1 (both referenced). Figure 2 Between ), in the following description, the direction along the first axis O1 is sometimes referred to as the first axis direction, the direction orthogonal to the first axis O1 is referred to as the first radial direction, and the direction of rotation around the first axis O1 is referred to as the first circumferential direction. In this case, the first axis direction is consistent with the direction of the back of the clock 2.

[0063] like Figure 5 As shown, the balance shaft 31 rotates clockwise and counterclockwise around the first axis O1 with a constant oscillation period via power transmitted from the hairspring 33. The surface end of the balance shaft 31 in the direction of the first axis is supported by a bearing (not shown) on the balance wheel and hairspring system clamp 29 (see reference). Figure 2 The back end of the pendulum 31 in the first axial direction is supported on the base plate 11 (see reference). Figure 2 (The bearing is not shown.)

[0064] A double disc (oscillator seat) 40 is externally embedded at the back end of the balance shaft 31 in the direction of the first axis. The double disc 40 is formed in a cylindrical shape and is arranged coaxially with the first axis O1. A disc pin (oscillator stone) 42 is provided on a portion of the double disc 40 in the first circumferential direction. The disc pin 42 repeatedly engages and disengages with the escapement fork of the escapement fork 22 in sync with the reciprocating rotation of the balance wheel and hairspring system 1. As a result, by the reciprocating rotation of the escapement fork 22, the pallet sprockets 22a and 22b repeatedly engage and disengage with the escape wheel 21.

[0065] like Figure 3 and Figure 5 As shown, the balance wheel 32 is fixed to the surface of the double disk 40 relative to the balance axis 31 in the direction of the first axis. The balance wheel 32 mainly has a hub portion 34, a spoke portion 35, and a rim portion 36. In this embodiment, the hub portion 34, the spoke portion 35, and the rim portion 36 are integrally formed of a metal material (e.g., brass).

[0066] The hub portion 34 is fixed to the swing shaft 31 by pressing or the like.

[0067] The spoke portion 35 extends radially outward from the hub portion 34 in the first radial direction. In this embodiment, four spoke portions 35 are provided at equal intervals in the first circumferential direction. Furthermore, the protruding position or number of spoke portions 35 can be appropriately changed.

[0068] The rim portion 36 is formed in an annular shape and is arranged coaxially with the first axis O1. The rim portion 36 surrounds the hub portion 34 from the outer side in the first radial direction. The outer end of the spoke portion 35 in the first radial direction is connected to the inner circumferential surface of the rim portion 36.

[0069] The hairspring 33, viewed from above along the first axis, is a spiral-shaped planar hairspring. The hairspring 33 is wound along an Archimedean curve. The inner end of the hairspring 33 is connected to the balance shaft 31 via an inner stud 44. The outer end of the hairspring 33 is connected to the balance wheel and hairspring system clamp 29 via an outer stud 45. The hairspring 33 functions to store the power transmitted from the fourth wheel 18 to the escape wheel 21 and then to the balance shaft 31.

[0070] As the material for the hairspring 33, a constant elastic material (e.g., Elinger alloy) is suitably used. The hairspring 33 has a positive Young's modulus over its operating temperature range. In this case, the temperature coefficient of the Young's modulus of the hairspring 33 is adjusted so that the oscillation period of the balance wheel and hairspring system 1 is as constant as possible relative to the temperature characteristics of the moment of inertia of the balance wheel 32 that varies with temperature. However, the hairspring 33 can also be formed of materials other than a constant elastic material. In this case, a general steel material with a negative Young's modulus (the characteristic that the spring constant decreases due to temperature rise) can also be used as the hairspring 33.

[0071] like Figure 3 As shown, a pair of adjustment parts 50 are provided at a position rotationally symmetrical about the first axis O1 of the balance wheel 32. Each adjustment part 50 is formed in the shape of a rod extending along a second axis O2 parallel to the tangent of the rim portion 36. Each adjustment part 50 is supported by a support part 38 integrally formed with the rim portion 36. The configurations of each adjustment part 50 and the support part 38 are identical, therefore, in the following description, one adjustment part 50 ( Figure 3 The adjustment part 50 on the right side of the diagram is described for example. In addition, in the following description, the direction along the second axis O2 is sometimes referred to as the second axis direction, the direction orthogonal to the second axis O2 is referred to as the second radial direction, and the direction of rotation around the second axis O2 is referred to as the second circumferential direction.

[0072] The support portion 38 is formed by a portion of the rim portion 36 bulging inward toward the first radial direction. More specifically, the support portion 38, viewed from the first axis direction, is formed in an L-shape by the following: a first column portion 46 extending inward toward the rim portion 36 in a direction orthogonal to the second axis O2; and a second column portion 47 extending inward toward the rim portion 36 in a direction parallel to the second axis O2. In this embodiment, a total of four such support portions 38 are provided, with an adjustment portion 50 provided between two adjacent support portions 38. Furthermore, another adjustment portion 50 is provided between the remaining two support portions 38. A mounting hole 37 (through hole) is formed in the first column portion 46 of the support portion 38, penetrating the support portion 38 along the second axis direction. The mounting hole 37 is formed in a circular shape when viewed from the second axis direction.

[0073] The adjustment part 50 is cantileveredly supported by the support part 38 on the inner side of the rim part 36. Specifically, the adjustment part 50 is formed by connecting the fixing part 51, the bimetallic part 52 and the counterweight 53 from the base end side (fixed end side) to the end side (free end 60 side) in the direction of the second axis.

[0074] The fixing part 51 is formed of, for example, a metal material. The fixing part 51 is formed in a circular shape when viewed from the second axial direction, corresponding to the mounting hole 37 described above. The fixing part 51 is pressed (elastically retained) into the mounting hole 37 described above.

[0075] The interference fit between the fixing part 51 and the mounting hole 37 is set to such an extent that when a predetermined torque is applied to the adjusting part 50 about the second axis O2 (second circumferential direction), the adjusting part 50 can rotate about the second axis O2. That is, the adjusting part 50 in this embodiment is configured such that its position about the second axis O2 can be adjusted by sliding the outer peripheral surface of the fixing part 51 on the inner peripheral surface of the mounting hole 37 and simultaneously rotating about the second axis O2.

[0076] The bimetallic portion 52 is joined (e.g., welded or bonded) to the end face of the fixing portion 51 in the second axial direction. The bimetallic portion 52 is formed as a plate extending linearly along the second axial direction, inside the rim portion 36 in the first radial direction. The bimetallic portion 52 is constructed by stacking two plates with different coefficients of thermal expansion (low-expansion component 52a and high-expansion component 52b) along the second radial direction. In this embodiment, the low-expansion component 52a is made of Invar alloy (Ni-Fe alloy) or silicon, ceramic, etc. The high-expansion component 52b is made of copper or copper alloy, aluminum, etc. The low-expansion component 52a and the high-expansion component 52b are formed with identical shapes (rectangular cross-sectional shapes orthogonal to the second axis O2). In the illustrated example, the boundary portion of the low-expansion component 52a and the high-expansion component 52b is located on the second axis O2. Furthermore, it is preferable that the center of gravity of each adjusting portion 50 is located on the second axis O2. Therefore, the plate thicknesses of the low-expansion component 52a and the high-expansion component 52b can also be different. When the plate thicknesses of the low-expansion component 52a and the high-expansion component 52b are different, the boundary portions of the low-expansion component 52a and the high-expansion component 52b extend parallel to the second axis O2.

[0077] The bimetallic part 52 (low expansion member 52a and high expansion member 52b) is configured such that its orientation in the second radial direction can be changed as the adjusting part 50 rotates about the second axis O2. The bimetallic part 52 is configured such that it can deform along the second radial direction with temperature changes by utilizing the difference in the thermal expansion rates of the low expansion member 52a and the high expansion member 52b.

[0078] like Figure 3 and Figure 4 As shown, the counterweight 53 is joined (e.g., welded or bonded) to the end face of the bimetallic portion 52 in the second axial direction. The counterweight 53 is formed of, for example, a metallic material. Figure 4As shown, the counterweight 53 has: a main body 54 mounted on the bimetallic part 52; and an end part 55 disposed further from the free end 60 than the main body 54. The cross-sectional shape of the main body 54 of the counterweight 53, orthogonal to the second axis O2, is circular. Viewed from the direction of the second axis, the outer diameter of the main body 54 of the counterweight 53 is larger than the outer diameter of the bimetallic part 52.

[0079] The end portion 55 of the counterweight 53 is integrally formed with the main body portion 54. The cross-sectional shape of the end portion 55, which is orthogonal to the second axis O2, is circular. The outer diameter of the end portion 55 is smaller than the outer diameter of the main body portion 54. Furthermore, the "free end 60 of the adjustment portion 50" in the technical solution includes the end portion 55 of the counterweight 53. The end portion 55 of the counterweight 53 is loosely inserted into the free end insertion portion 71 (restriction portion 70) of the support portion 38 formed in the rim portion 36.

[0080] Next, use Figure 4 The adjustment method for the temperature coefficient correction amount using the aforementioned adjustment unit 50 will be explained. Figure 4 In the state where the bimetallic part 52 has the low expansion member 52a located inside the first radial direction, the low expansion member 52a and the high expansion member 52b are arranged side by side along the first radial direction.

[0081] like Figure 4 As shown, in the balance wheel and hairspring system 1 of this embodiment, if a temperature change occurs, the bimetallic part 52 bends and deforms due to the difference in the thermal expansion rates of the low-expansion component 52a and the high-expansion component 52b. Specifically, when the temperature rises relative to a predetermined temperature T0 (room temperature (e.g., around 23 °C)), the high-expansion component 52b expands more than the low-expansion component 52a. Consequently, the adjustment part 50 shifts towards the side in the stacking direction of the low-expansion component 52a and the high-expansion component 52b (…). Figure 4 The inner side of the first radial direction in the middle) deforms (see the double-dotted line in the figure). On the other hand, when the temperature drops relative to the predetermined temperature T0, the high expansion member 52b shrinks more than the low expansion member 52a. As a result, the adjustment part 50 moves to the other side of the stacking direction ( Figure 4 The outer side of the first radial direction. ) Deformation.

[0082] By deforming the adjusting section 50, the distance between the end portion 55 (free end 60) of the adjusting section 50 and the first axis O1 in the first radial direction changes. Specifically, when the temperature rises, the distance between the end portion 55 of the adjusting section 50 and the first axis O1 decreases, and when the temperature falls, the distance between the end portion 55 of the adjusting section 50 and the first axis O1 increases. Moreover, the average diameter of the balance wheel 32 can be reduced or expanded accordingly with the amount of change in distance, thereby changing the moment of inertia of the balance wheel and hairspring system 1 about the first axis O1. That is, when the temperature rises, the average diameter of the balance wheel 32 can be reduced to decrease the moment of inertia. When the temperature falls, the average diameter of the balance wheel 32 can be expanded to increase the moment of inertia. Thus, the temperature coefficient of the moment of inertia can be corrected.

[0083] However, as in this embodiment, when a constant elastic material is used in the hairspring 33, the temperature coefficient of Young's modulus may vary positively or negatively depending on the processing conditions during the manufacturing process of the hairspring 33 (e.g., melting or heat treatment). If the temperature coefficient of variation has a negative characteristic, it tends to decrease as the temperature increases. If the temperature coefficient of variation has a positive characteristic, it tends to increase as the temperature increases.

[0084] In contrast, in this embodiment, the orientation (rotation angle about the second axis O2) of the bimetallic portion 52 can be changed in accordance with the temperature coefficient of the Young's modulus of the hairspring 33. In other words, the stacking direction of the low expansion member 52a and the high expansion member 52b of the bimetallic portion 52 can be changed.

[0085] For example, the position of the adjustment section 50 is taken as the reference position when the stacking direction of the low expansion component 52a and the high expansion component 52b is aligned with the back of the balance wheel and hairspring system 1. When the adjustment section 50 is in the reference position, the bimetallic section 52 deforms only along the first axis. Therefore, in the reference position, the change in distance between the end portion 55 of the adjustment section 50 and the first axis O1 is 0, and thus the temperature coefficient of the moment of inertia does not change.

[0086] When the orientation of the bimetallic part 52 is rotated relative to a reference position so that the low-expansion member 52a is located further inside in the first radial direction than the high-expansion member 52b, as described above, when the temperature rises, the end part 55 of the adjustment part 50 approaches the first axis O1, thereby reducing the inertial torque compared to the reference position. Furthermore, by adjusting the amount of rotation of the bimetallic part 52 relative to the reference position, the amount of reduction in the inertial torque can be finely adjusted.

[0087] On the other hand, when the orientation of the bimetallic part 52 is rotated relative to the reference position so that the low-expansion member 52a is located further outward in the first radial direction than the high-expansion member 52b, the end portion 55 of the adjusting part 50 moves away from the first axis O1 when the temperature rises, thereby increasing the inertial torque compared to the reference position. Moreover, by adjusting the amount of rotation of the bimetallic part 52 relative to the reference position, the amount of increase in the inertial torque can be finely adjusted.

[0088] Therefore, when the temperature difference has a negative temperature characteristic, the bimetallic part 52 of the adjustment unit 50 is rotated so that the low expansion member 52a is located further inside in the first radial direction than the high expansion member 52b. This ensures that the radius change in the inward direction accompanying temperature rise is reduced, decreasing the temperature coefficient of the inertial torque, and thus suppressing the increase in the inertial torque of the balance wheel and hairspring system 1 accompanying temperature rise. As a result, the temperature coefficient of the oscillation period of the balance wheel and hairspring system 1 is adjusted towards zero, maintaining the temperature difference at a constant level regardless of temperature changes.

[0089] Furthermore, when the temperature difference has a positive temperature characteristic, the bimetallic part 52 of the adjustment unit 50 is rotated so that the low expansion member 52a is located further outward in the first radial direction than the high expansion member 52b. This ensures that the radius change in the outermost direction along the first radial direction, which occurs with increasing temperature, increases the temperature coefficient of the inertial torque, thereby increasing the increase in the inertial torque of the balance wheel and hairspring system 1 with increasing temperature. As a result, the temperature coefficient of the oscillation period of the balance wheel and hairspring system 1 is adjusted towards zero, maintaining the temperature difference at a constant level regardless of temperature changes.

[0090] In this way, by changing the rotation angle of the adjustment unit 50 (the rotation angle of the bimetallic part 52) ​​in accordance with the temperature characteristics of the difference rate, the temperature coefficient of the inertial torque of the balance wheel and hairspring system 1 can be corrected to both positive and negative. As a result, the deviation of the temperature coefficient of Young's modulus can be easily eliminated by using the temperature characteristics of the inertial torque of the balance wheel and hairspring system 1.

[0091] Return to Figure 3 and Figure 4A limiting part 70 is provided in the rim portion 36 (support portion 38) at a position corresponding to the free end 60 of the adjusting part 50 (i.e., the end portion 55 of the counterweight 53). The limiting part 70 restricts the movement of the adjusting part 50 so that the free end 60 of the adjusting part 50 does not move beyond a predetermined range. As described above, in this embodiment, the limiting part 70 is a free end insertion part 71 formed in the rim portion 36 and into which the free end 60 of the adjusting part 50 is inserted. The free end insertion part 71 is a hole that passes through the support portion 38 along the second axis direction. The inner diameter of the free end insertion part 71 (hole) is larger than the outer diameter of the end portion 55 of the counterweight 53. In addition, in this embodiment, the inner diameter of the free end insertion part 71 is the same as the inner diameter of the mounting hole 37.

[0092] Regarding the free end insertion part 71, its inner diameter is set such that the bimetallic part 52 has a clearance of 0 mm or more relative to the operating temperature of the predetermined balance wheel and hairspring system 1 (e.g., 8 to 38 °C).

[0093] As an example, the free end insertion portion 71 is formed such that its inner diameter is equivalent to the range of movement of the bimetallic portion 52 within a temperature range (e.g., 0 to 50 °C) wider than the predetermined operating temperature of the balance wheel and hairspring system 1. Alternatively, the free end insertion portion 71 may also be formed such that it has a gap corresponding to a temperature change exceeding the predetermined operating temperature X degrees (X ≥ 0) of the balance wheel and hairspring system 1. Furthermore, X is preferably set within the range of 0 degrees ≤ X degrees ≤ 30 degrees.

[0094] As another example, the free end insertion portion 71 may also be formed with a gap of 0 mm to 0.1 mm relative to the movement range of the bimetallic portion 52 at a predetermined operating temperature (e.g., 8 to 38 °C) of the balance wheel and hairspring system 1. Preferably, the free end insertion portion 71 may also be formed with a gap of 0.01 mm to 0.1 mm relative to the movement range of the bimetallic portion 52. More preferably, the free end insertion portion 71 may also be formed with a gap of 0.02 mm to 0.05 mm relative to the movement range of the bimetallic portion 52.

[0095] (Function, Effect) Next, the function and effect of the temperature-compensated balance wheel and hairspring system 1 described above will be explained.

[0096] The temperature-compensated balance wheel and hairspring system 1 according to this embodiment includes: a balance wheel and hairspring system body 30, which rotates about a first axis O1; an adjustment part 50, which is cantilevered along a second axis O2 and has a bimetallic part 52; and a limiting part 70, which is provided at a position corresponding to the free end 60 of the adjustment part 50 and restricts the movement of the adjustment part 50. With this configuration, as the temperature changes, the bimetallic part 52 of the adjustment part 50 deforms, thereby changing the average diameter of the balance wheel and hairspring system body 30. This allows for the correction of the temperature characteristics of the inertial torque. As a result, the oscillation period of the balance wheel and hairspring system 1 can be kept constant, resulting in a balance wheel and hairspring system 1 with excellent temperature compensation characteristics. Furthermore, since the adjustment part 50 extends cantilevered, the amount of deformation in the radial direction with temperature changes can be ensured, increasing the amount of temperature correction based on the bimetallic part 52.

[0097] A limiting part 70 is provided at a position corresponding to the free end 60 of the adjusting part 50. Therefore, even when the balance wheel and hairspring system 1 is impacted due to a fall or other event, the limiting part 70 restricts the movement of the free end 60 of the adjusting part 50, thus suppressing deformation of the bimetallic part 52. As a result, compared to the prior art, even when impacted, accurate temperature compensation can be achieved, suppressing the differential rate deviation of the watch 2. Furthermore, there is no need to lighten the counterweight 53 as a countermeasure against impact, thus eliminating the constraint of the counterweight 53's weight and ensuring a large temperature correction amount. Moreover, there is no need to increase the strength of the bimetallic part 52 as a countermeasure against impact, thus reducing constraints on the bimetallic material (Young's modulus, allowable stress, etc.) and increasing the freedom of material selection. In other words, the design can be carried out only considering the coefficient of thermal expansion. Therefore, high-precision temperature compensation performance can be achieved. In addition, compared to increasing the strength of the bimetallic part 52, the weight of the balance wheel and hairspring system can be suppressed, thus suppressing the generation of balance error.

[0098] Therefore, a temperature-compensated balance spring system 1 is provided that can suppress deformation of the bimetallic part 52 and improve temperature compensation performance.

[0099] The balance wheel and hairspring system body 30 includes a balance shaft 31 and a balance wheel 32. The second axis O2 is a straight line that, when viewed from above from the first axis O1, is located inside the rim portion 36 and parallel to the tangential direction of the rim portion 36. Furthermore, an adjustment section 50 extends from the rim portion 36. With this configuration, the adjustment section 50 is located on the rim portion 36 of the balance wheel 32, thus allowing the adjustment section 50 to be radially removed from the first axis O1. This increases the amount of radial deformation of the adjustment section 50 and increases the amount of temperature coefficient correction based on the bimetallic section 52. Additionally, since the second axis O2 is located inside the rim portion 36, while suppressing the increase in the size of the balance wheel and hairspring system 1 with the addition of the adjustment section 50, the amount of radial deformation with temperature changes can be ensured.

[0100] The limiting part 70 includes a free end insertion part 71 formed along the second axis O2 on the rim portion 36, into which the free end 60 of the adjusting part 50 is inserted. With this configuration, the limiting part 70 is provided on the rim portion 36, thereby suppressing the increase in the number of parts and the increase in the weight of the balance wheel and hairspring system 1 caused by the provision of the limiting part 70. By inserting the free end 60 of the adjusting part 50 into the free end insertion part 71 formed on the rim portion 36, the movement of the free end 60 of the adjusting part 50 can be limited. Therefore, deformation of the adjusting part 50 during impact can be suppressed with a simple configuration.

[0101] The rim portion 36 has a mounting hole 37 for fixing one end of the adjusting portion 50, and the mounting hole 37 is formed in such a way that its inner diameter is the same as the inner diameter of the free end insertion portion 71. With this configuration, the mounting hole 37 and the free end insertion portion 71 formed in the rim portion 36 can be formed simultaneously. Alternatively, the mounting hole 37 and the free end insertion portion 71 can be formed using the same tool. Therefore, workability during manufacturing can be improved.

[0102] The adjustment section 50 has a counterweight 53 mounted on the free end 60 side of the bimetallic section 52. The counterweight 53 has a main body 54 mounted on the bimetallic section 52 and an end portion 55 with an outer diameter smaller than that of the main body 54. The end portion 55 of the counterweight 53 is inserted into the free end insertion portion 71 of the limiting section 70. With this configuration, by providing the counterweight 53, the weight of the adjustment section 50 can be increased, thereby increasing the temperature correction amount based on the bimetallic section 52. In addition, by inserting the end portion 55 of the counterweight 53 with a small outer diameter into the free end insertion portion 71, the inner diameter of the free end insertion portion 71 can be reduced. Therefore, especially when the free end insertion portion 71 is formed in the rim section 36, the strength reduction of the rim section 36 can be suppressed while achieving excellent temperature compensation performance.

[0103] The limiting part 70 is formed with a gap corresponding to a predetermined temperature change of 0 to 30 degrees Celsius relative to a predetermined operating temperature. Alternatively, it is formed with a gap of 0 mm to 0.1 mm relative to the range of movement of the bimetallic part 52 at a predetermined operating temperature. With this configuration, the gap size can be appropriately set relative to the swing amplitude of the adjusting part 50 at the intended operating temperature. Therefore, deformation during impact can be suppressed, and temperature compensation performance can be effectively achieved simultaneously.

[0104] The movement 3 and watch 2 according to this embodiment are equipped with the temperature-compensated balance spring system 1 described above. Therefore, it is possible to provide a high-performance movement 3 and watch 2 that have a temperature-compensated balance spring system 1 that can suppress deformation of the bimetallic part 52 and improve temperature compensation performance.

[0105] (Second Implementation) Next, use Figures 6 to 8 The second to fourth embodiments of the present invention will now be described. In the following description, the same reference numerals will be used for configurations identical to those in the first embodiment described above, and descriptions will be omitted where appropriate. Furthermore, the specific configuration is not limited to these embodiments and can be appropriately modified without departing from the spirit of the invention. In the second to fourth embodiments, the configuration of the limiting part 70 or the method by which the limiting part 70 limits the movement of the free end 60 of the adjusting part 50 differs from that in the first embodiment described above.

[0106] Figure 6 This is a cross-sectional view of the balance wheel and hairspring system 201 according to the second embodiment. Figure 6 It is equivalent to the first embodiment. Figure 5 A cross-sectional view of the location.

[0107] like Figure 6 As shown, in the second embodiment, the adjusting portion 250 has a recess 256 at its free end 60 side, recessed along the second axis O2. The recess 256 is formed in the counterweight 53. The limiting portion 70 has a protrusion 271 that inserts into the recess 256. The protrusion 271 protrudes from the support portion 38 along the second axis direction. That is, in the first embodiment described above, the free end 60 of the adjusting portion 50 is inserted into the limiting portion 70; in contrast, in this embodiment, the limiting portion 70 is inserted into the free end 60 of the adjusting portion 250. The size of the gap between the protrusion 271 and the recess 256 can also be the same as in the first embodiment.

[0108] The temperature-compensated balance wheel and hairspring system 201 according to the second embodiment, similar to the first embodiment described above, can provide a temperature-compensated balance wheel and hairspring system 201 that can suppress deformation of the bimetallic part 52 during impacts and improve temperature compensation performance. Furthermore, since a limiting part 70 can be provided in the rim portion 36 of the balance wheel and hairspring system 201 without forming holes or recesses, the strength reduction of the balance wheel and hairspring system 201 caused by the provision of the limiting part 70 can be suppressed. Therefore, the strength reduction of the balance wheel and hairspring system 201 and the deformation of the bimetallic part 52 can be suppressed, and the temperature compensation performance can be improved.

[0109] (Third Implementation) Figure 7 This is a perspective view of the balance wheel and hairspring system 301 according to the third embodiment. Figure 7 As shown, in the third embodiment, the limiting part 70 has a pair of wall portions 375 connected to the balance wheel and hairspring system body 30. A pair of wall portions 375 are provided on both sides of the free end 60 of the adjusting part 50 in the first axial direction (the vertical direction in the technical solution, consistent with the direction of the back of the balance wheel and hairspring system 1), limiting (constraining) the range of movement of the free end 60 in the first axial direction. The pair of wall portions 375 extend along the surface and back of the balance wheel 32. A counterweight 53 of the adjusting part 50 is inserted between the pair of wall portions 375.

[0110] According to the temperature-compensated balance wheel and hairspring system 301 of the third embodiment, by moving the free ends 60 of the pair of wall portions 375 constraint adjustment portions 50 in the up-down direction (along the axial direction of the first axis O1), deformation of the bimetallic portion 52 during impact can be suppressed. Therefore, a temperature-compensated balance wheel and hairspring system 301 that can suppress deformation of the bimetallic portion 52 and improve temperature compensation performance can be provided. Furthermore, the versatility of the limiting portion 70 can be improved.

[0111] (Fourth implementation) Figure 8 This is a perspective view of the balance wheel and hairspring system 401 according to the fourth embodiment.

[0112] like Figure 8 As shown, in the fourth embodiment, the limiting part 70 has a pair of wall portions 480 connected to the balance wheel and hairspring system body 30. A pair of wall portions 480 are provided on both sides of the free end 60 of the adjusting part 50 in the first radial direction, limiting (constraining) the range of movement of the free end 60 in the first radial direction. The pair of wall portions 480 protrude from the support portion 38 of the balance wheel 32 toward the inside of the balance wheel 32 in the second axial direction. A counterweight 53 of the adjusting part 50 is inserted between the pair of wall portions 480.

[0113] According to the temperature-compensated balance wheel and hairspring system 401 of the fourth embodiment, by moving the free ends 60 of the pair of wall portions 480 constraint adjustment portions 50 in the left-right direction (along the radial direction of the first axis O1), deformation of the bimetallic portion 52 during impact can be suppressed. Therefore, a temperature-compensated balance wheel and hairspring system 401 that can suppress deformation of the bimetallic portion 52 and improve temperature compensation performance can be provided. Furthermore, the versatility of the limiting portion 70 can be improved.

[0114] (Fifth Embodiment) Next, the fifth embodiment of the present invention will be described. In the following description, the same reference numerals will be used for the same configuration as in the first embodiment described above, and descriptions will be omitted as appropriate. Figure 9 This is a perspective view of the balance wheel and hairspring system 501 according to the fifth embodiment. In the fifth embodiment, the point where the bimetallic part 552 is formed in the shape of a rim differs from that in the first embodiment described above.

[0115] like Figure 9 As shown, in the fifth embodiment, the balance wheel and hairspring system body 30 includes: a balance shaft 31; a pair of spoke portions 535a and 535b extending from the balance shaft 31 along a first radial direction; and a pair of rim portions 536a and 536b surrounding the balance shaft 31 from the outer side of the first axis O1 in the radial direction. Each rim portion 536a and 536b is formed in a semi-circular arc shape when viewed from the first axis direction. The pair of spoke portions 535a and 535b are arranged at 180° intervals from each other in the first circumferential direction. One end of a rim portion 536a is connected to the outer diameter side end of one of the spoke portions 535a and 535b. One end of the other rim portion 536b is connected to the outer diameter side end of the other spoke portion 535b. Therefore, each rim portion 536a, 536b becomes a cantilever structure with one end supported when connected to the corresponding spoke portions 535a, 535b.

[0116] In this embodiment, the rim portions 536a and 536b are collectively referred to as bimetallic portions 552. In other words, the second axis O22 extending in the bimetallic portion 552 in this technical solution is an arc-shaped curve along the rim portions 536a and 536b. The rim portions 536a and 536b (bimetallic portion 552) are formed by stacking a low-expansion member 52a located on the inner side in the first radial direction and a high-expansion member 52b located on the outer side in the first radial direction.

[0117] Regarding the balance wheel and hairspring system 501 thus formed, if a temperature change occurs, the rim portions 536a and 536b (bimetallic portion 552) will bend and deform due to the difference in the thermal expansion rates of the low-expansion component 52a and the high-expansion component 52b. Specifically, when the temperature rises relative to a predetermined temperature T0, the high-expansion component 52b expands more than the low-expansion component 52a. As a result, the free ends 560 of the rim portions 536a and 536b (bimetallic portion 552) deform inward toward the first radial direction. Consequently, the average diameter of the balance wheel 532 can be reduced, thereby decreasing the moment of inertia.

[0118] On the other hand, when the temperature drops relative to a predetermined temperature T0, the high-expansion component 52b contracts more than the low-expansion component 52a. As a result, the free ends 560 of the rim portions 536a and 536b (bimetallic portion 552) deform outward in the first radial direction. Consequently, the average diameter of the balance wheel 532 can be increased, thereby increasing the moment of inertia.

[0119] A limiting portion 570 is installed on each of a pair of spoke portions 535a and 535b. Specifically, in one of the spoke portions 535a, a limiting portion 570 is provided to limit the movement range of the free end 560 of the other rim portion 536b (bimetallic portion 552). In the other spoke portion 535b, a limiting portion 570 is provided to limit the movement range of the free end 560 of the rim portion 536a (bimetallic portion 552). Each limiting portion 570 is provided at a position corresponding to the free end 560 of the rim portion 536a and 536b (bimetallic portion 552), and is formed such that it has wall portions on the inner and outer sides of the free end 560 in the first radial direction. Thus, the limiting portion 570 restricts the movement of the free end 560 of the rim portion 536a and 536b (bimetallic portion 552) in the first radial direction.

[0120] Furthermore, similar to the first embodiment, a counterweight 53 may also be provided near the free end 560 of the rim portions 536a and 536b (bimetallic portion 552) (see reference). Figure 3 ).

[0121] According to the temperature-compensated balance wheel and hairspring system 501 of the fifth embodiment, the rim portions 536a and 536b and the bimetallic portion 552 (adjustment portion 550) are integrated, thus enabling a simpler configuration. Furthermore, not only the rod-shaped bimetallic portion 52 of the first embodiment described above, but also the rim-shaped bimetallic portion 552, can achieve the same functional effect as in the first embodiment, thereby improving the versatility of the temperature-compensated balance wheel and hairspring system 501.

[0122] Furthermore, even when the balance wheel and hairspring system 501 is impacted due to a fall or other event, the movement of the free end 560 of the adjustment unit 550 is constrained by the limiting part 570, thereby suppressing deformation of the bimetallic part 552. Therefore, even with an impact, proper temperature compensation can be achieved, suppressing differential rate deviation in the clock 2. Thus, a temperature-compensated balance wheel and hairspring system 501 that suppresses deformation of the bimetallic part 552 and improves temperature compensation performance can be provided.

[0123] Furthermore, the scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

[0124] For example, in the above embodiment, a configuration in which two adjustment portions 50 are provided at a rotationally symmetrical position on the rim portion 36 has been described, but this configuration is not limited to. That is, if the adjustment portions 50 are provided at a rotationally symmetrical position, three or more adjustment portions 50 may also be provided. In this case, it is preferable to provide the same number of limiting portions 70 as the adjustment portions 50.

[0125] In the above embodiments, the cases where the limiting part 70 is a hole (or recess) 71, a protrusion 271, or a pair of wall parts 375 and 480 have been described, but the shape of the limiting part 70 is not limited to the shape of the above embodiments. That is, as long as it is provided in a way that at least restricts the movement range of the adjustment part 50, the number or orientation of the restricted directions can be appropriately changed.

[0126] The shape of the mounting hole 37 formed on the rim portion 36 is not limited to a circular shape, and may also be rectangular or triangular. However, by forming the mounting hole 37 in a circular shape and making the inner diameter of the mounting hole 37 the same as the inner diameter of the free end insertion portion 71, the solution of this embodiment has the advantage of improving machinability.

[0127] The counterweight 53 can also be installed on the bimetallic part 52 in a detachable manner.

[0128] The shape of the counterweight 53 or the shape of the support part 38 (rim part 36), the material of the low expansion member 52a and the high expansion member 52b of the bimetallic part 52 are not limited to the shapes or materials of the embodiments described above.

[0129] Furthermore, without departing from the spirit of the present invention, the constituent elements in the above embodiments can be appropriately replaced with well-known constituent elements, and the above embodiments can also be appropriately combined.

[0130] [Explanation of reference numerals in the attached figures] 1, 201, 301, 401, 501 Temperature-compensated balance wheel and hairspring system 2. Clocks 3. Movement 30 Balance wheel and hairspring system main body 31. Balance Axis 32, 532 balance wheel 33. Gossamer threads 35 Spoke section 36, 536a, 536b rim section 37 mounting holes Adjustment section for 50, 250, and 550 52, 552 Bimetallic Part 53 counterweight 54 Main Body 55 terminal part 60, 560 Free End 70, 570 Restriction Section 71 Free end insertion part 256 recess 271 convex part 375 A pair of wall sections 480 A pair of wall sections O1 Axis 1 O2, O22, second axis.

Claims

1. A temperature-compensated balance wheel and hairspring system, comprising: The main body of the balance wheel and hairspring system has a balance shaft extending along a first axis, which rotates about the first axis by the power of the hairspring; The adjustment section, which is cantilevered along the second axis at a position rotationally symmetrical about the first axis from the main body of the balance wheel and hairspring system, and has a bimetallic section composed of materials with different coefficients of thermal expansion stacked in a direction intersecting the second axis; and A limiting part is provided at a position corresponding to the free end of the adjusting part, and restricts the movement of the adjusting part with a gap of 0 mm or more relative to the movement range of the bimetallic part at a predetermined operating temperature.

2. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The main components of the balance wheel and hairspring system include: The pendulum shaft; and A balance wheel, having a rim portion surrounding the balance shaft from the outer side in the radial direction of the first axis, is mounted on the balance shaft. From a top view taken from the first axis, the second axis is a straight line intersecting the rim portion. The adjustment part extends from the rim portion toward the inside of the rim portion.

3. The temperature-compensated balance wheel and hairspring system according to claim 2, wherein, The limiting part includes a free end insertion part, which is formed on the rim part along the second axis and is for the free end of the adjusting part to be inserted.

4. The temperature-compensated balance wheel and hairspring system according to claim 3, wherein, The rim portion has a mounting hole for fixing one end of the adjusting portion. It is formed such that the inner diameter of the mounting hole is the same as the inner diameter of the free end insertion part.

5. The temperature-compensated balance wheel and hairspring system according to claim 3, wherein, The adjustment part has a counterweight installed on the free end side of the bimetallic part. The counterweight has a main body portion mounted on the bimetallic part and an end portion with an outer diameter smaller than the main body portion. The end portion to which the counterweight is inserted is inserted into the free end insertion portion of the limiting portion.

6. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The limiting part is formed in such a way that it has a gap corresponding to a predetermined temperature change of 0 degrees to 30 degrees relative to a predetermined operating temperature, or a gap of 0 mm to 0.1 mm relative to the range of movement of the bimetallic part at a predetermined operating temperature.

7. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The adjusting part has a recess along the second axis at its end on the free end side. The limiting portion includes a protrusion that is inserted into the recess.

8. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The limiting part includes a pair of wall portions connected to the main body of the balance wheel and hairspring system, which restrict the free end of the adjusting part from moving in a vertical direction parallel to the first axis.

9. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The limiting part includes a pair of wall portions connected to the main body of the balance wheel and hairspring system, which restrict the movement of the free end of the adjusting part in a radial direction intersecting the first axis.

10. The temperature-compensated balance wheel and hairspring system according to claim 1, wherein, The main components of the balance wheel and hairspring system include: The pendulum shaft; and The balance wheel has a rim portion surrounding the balance shaft from the outer side in the radial direction of the first axis, and spoke portions extending in the radial direction connecting the balance shaft to the rim portion. The second axis is a curve along the rim portion. The rim portion becomes the bimetallic portion.

11. The temperature-compensated balance wheel and hairspring system according to claim 10, wherein, The limiting part is installed on the spoke part to restrict the movement of the free end in the radial direction.

12. A movement comprising a temperature-compensated balance wheel and hairspring system according to any one of claims 1 to 11.

13. A timepiece comprising the movement according to claim 12.

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