A structural spring suitable for watch mechanism

Abstract

The present invention discloses a structural spring suitable for a watch mechanism, comprising a positioning hole, a toggle arm, and an elastic arm; the positioning hole is in clearance with a clamping plate column, and the structural spring can rotate around the clamping plate column; a plurality of elastic arms are formed on the periphery of the positioning hole, and a toggle arm is formed at the end of the elastic arm, and the toggle arm contacts the limited part. The beneficial effect is that since the positioning hole is in clearance with the clamping plate column, the structural spring can rotate around the clamping plate column, so that the limiting function of a structural spring on multiple limited parts can be realized, and the structural spring can reduce the number of assembled parts, effectively improve the working safety and structural reliability of the structural spring, and extend its fatigue life.

Description

Technical Field

[0001] The invention relates to a structural spring, in particular to a structural spring suitable for a watch mechanism. Background Art

[0002] The limit spring involved in the movement of a mechanical watch has one end fixed on the splint through a positioning hole, and the toggle arm at the other end contacts the limited part. When the limited part is displaced, it pushes the toggle arm, which limits the limited part through the elastic arm and causes it to return to its original position. The greater the displacement of the limited part, the more serious the deformation of the structural spring, which generates greater stress inside. If the stress exceeds the performance limit of the structural spring material, it will cause the structural spring to fail and the movement structure limit function cannot be realized. In the same mechanism, only changing the size of the structural spring cannot effectively improve its working reliability.

[0003] The limit function of a mechanical watch movement is generally achieved through the cooperation of the limited parts and the limit structure spring. If the movement has multiple limit functions, it often requires the cooperation of multiple limited parts and limit structure springs, and the number of parts is large.

[0004] The published patent CN206601567U watch date positioning lever spring, watch movement and watch discloses a watch positioning lever spring structure, in which the watch positioning lever spring has only one toggle arm, one transmission arm and one elastic arm, and the function of the parts is single; the material of the parts is carbon steel, and the processing material is single; the deformation of the parts is completely concentrated in the elastic arm, and a large stress is generated at the elastic arm, which may exceed the bearing limit of the material, causing the parts to fail, and reducing the fatigue life of the parts during repeated work.

[0005] Patent CN2496057Y has been published, which is a large calendar mechanism for watches. It discloses a spring body structure with two working ends, in which a positioning rod that combines a rod and a spring is fixed through a positioning hole. The two working ends work independently, one working end has a large deformation during operation, and the other end has no response to it. The material undergoes periodic large deformation, which shortens the life of the parts. Summary of the invention

[0006] The technical problem solved by the present invention is to improve the working reliability of the structural spring and to provide a structural spring capable of limiting the positions of multiple parts.

[0007] The technical solution adopted by the present invention is: a structural spring suitable for a watch mechanism, comprising a positioning hole, a toggle arm, and an elastic arm; the positioning hole is clearance-matched with a splint column, and the structural spring can rotate around the splint column; a plurality of elastic arms are formed on the outer periphery of the positioning hole, a toggle arm is formed at the end of the elastic arm, and the toggle arm contacts the limited part.

[0008] The positioning hole and the toggle arm are integrally formed or the positioning hole and the toggle arms are combined into one body.

[0009] The plurality of elastic arms are installed on the same horizontal plane or are stacked up and down.

[0010] The number of the elastic arms is 2 to 4.

[0011] The elastic arm is made of spring steel, stainless steel or copper alloy.

[0012] The toggle arm has a smooth arc shape, and the side roughness is less than 0.4 μm; the thickness of the elastic arm is greater than 0.2 mm.

[0013] The beneficial effect of the present invention is that due to the clearance fit between the positioning hole and the clamping plate column, the structural spring can rotate around the clamping plate column, thereby realizing the limiting function of one structural spring on multiple limited parts. The structural spring can reduce the number of assembly parts, effectively improve the working safety and structural reliability of the structural spring, and extend its fatigue life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a structural spring including two elastic arms of the present invention;

[0015] Figure 2 It is a schematic diagram of the decomposition and combination of two elastic arms and positioning holes of the present invention;

[0016] Figure 3 It is a schematic diagram of the decomposition and combination of the elastic arm and the positioning hole of the present invention;

[0017] Figure 4 It is a cross-sectional view of the elastic arms of the present invention superimposed up and down;

[0018] Figure 5 It is a plan view of the present invention including three structural springs;

[0019] Figure 6 It is a plan view of the present invention including four structural springs;

[0020] Figure 7 It is a working schematic diagram of the contact between the limited member and the structural spring of the present invention;

[0021] Figure 8 It is a schematic diagram of stress simulation results when the two structural springs of the present invention are working when the structural spring is fixed to the clamping plate column;

[0022] Fig. 9 It is a schematic diagram of stress simulation results when two structural springs of the present invention are working when the structural spring can rotate around the clamping plate column;

[0023] Fig.10This is a schematic diagram of the stress simulation results of the three structural springs when the structural spring of the present invention is fixed to the clamping column.

[0024] Fig.11 It is a schematic diagram of stress simulation results when the three structural springs of the present invention are working when the structural spring can rotate around the clamping plate column. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] like Figures 1 to 6 As shown, the present invention is applicable to the structural spring of the watch mechanism, including a positioning hole, a toggle arm, and an elastic arm; the positioning hole is in clearance with the clamping plate column, and the structural spring can rotate around the clamping plate column; a plurality of elastic arms are formed on the periphery of the positioning hole, and the plurality of elastic arms realize the limiting function of the limited parts in the plurality of limiting structures, thereby reducing the number of parts when assembling the movement, and a toggle arm is formed at the end of the elastic arm, and the toggle arm contacts the limited parts. The positioning hole and the toggle arm are integrally formed or the positioning hole and each toggle arm are combined into one, that is, the toggle arm and the elastic arm at each end can be processed as a whole, or the positioning plate, the toggle arm at each end and the elastic arm can be processed separately, and then assembled into a multi-purpose structural spring, and the dual-purpose structural spring is processed in sections, including: a positioning plate 10, a first working end 20, and a second working end 30. Each section of the structural spring has a positioning hole, and can be assembled into a dual-purpose structural spring by riveting or other possible methods. The two working ends can be assembled on one plane or on different planes, realizing the limiting function of two limited parts in the same plane, and also realizing the limiting function of two limited parts in different planes. There are 2 to 4 elastic arms. The materials of the toggle arm and the elastic arm are spring steel, stainless steel or copper alloy and other materials suitable for processing elastic parts. The shape of the toggle arm is a smooth arc, and the side roughness is less than 0.4μm. The length of the elastic arm is increased within the allowable range of the structural design; the thickness of the elastic arm is greater than 0.2mm, and the thickness is related to the reaction force, and it can be adjusted accordingly according to product needs.

[0027] like Figure 3 As shown, the structural spring includes: a first working end 20, a positioning plate and a second working end 40. The two parts are assembled to obtain Figure 4 The two working ends shown are not in the same plane.

[0028] The present invention only lists several partial processing and assembly methods of structural springs. Other possible partial processing and assembly methods for realizing the functions of the parts also fall within the scope of the present invention.

[0029] Through the coordination of the toggle arms and the elastic arms at both ends, the structural spring can limit the displacement of the limited parts at both ends, while reducing the number of parts assembled in the watch. The toggle arm contacts the side of the limited part, requiring the toggle arm to be in a smooth arc shape with a side roughness not exceeding 0.4μm, to ensure that the toggle arm and the limited part can slide relative to each other when the part is displaced. The thickness of the dual-purpose structural spring should be greater than 0.2mm. Within the allowable range of the structural design, increasing the length of the elastic arm can enable the elastic arm to withstand a larger displacement of the toggle arm, improve the safety and reliability of the structural spring, and extend its fatigue life.

[0030] The structural spring of the present invention does not limit the number of the toggle arms and the elastic arms, that is, the number of the working ends. According to the structure of the watch, the present invention also includes the following: Figure 5 The three-purpose structural spring shown, such as Figure 6 The four-purpose structural spring shown, as well as the multi-head limit spring which is not shown in the figure but can realize multiple limit functions at the same time, the processing technology includes integrated processing, assembly processing, and other possible implementation methods.

[0031] Embodiment 1:

[0032] like Figure 7 As shown, a structural spring suitable for a watch mechanism of the present invention comprises: a positioning hole 1, a first toggle arm 2 and a second toggle arm 3, a first elastic arm 4 and a second elastic arm 5. The structural spring is assembled on the clamping plate column through the positioning hole 1, and the positioning hole and the clamping plate column are clearance-matched, and the structural spring can rotate around the clamping plate column. The limited part is assembled on the clamping plate through the positioning hole 7, and the first toggle arm 2 of the structural spring contacts the limited part, and the first elastic arm 4 is compressed to produce a certain pre-deformation. The second toggle arm 3 of the structural spring contacts the simplified limited part 8, and the second elastic arm 5 also undergoes a certain pre-deformation.

[0033] When an external force acts on the toggle end 6 of the limited part, the limited part rotates around the clamping plate column of the positioning hole 7, pushing the first toggle arm 2 of the structural spring to displace, and at the same time, the structural spring rotates around the clamping plate column at the positioning hole 1, and the second toggle arm 3 slides with the side of the limited part 8. The displacement of the first toggle arm 2 causes the first elastic arm 4 to deform, and the sliding of the second toggle arm 3 causes the second elastic arm 5 to deform. The deformed elastic arm has a tendency to restore to a free state, generating a reaction force on the limited part, limiting its displacement, and realizing the limiting function.

[0034] The working principle of the second moving arm 3 and the second elastic arm 5 of the structural spring on the limiting function of the limited part 8 is the same as above.

[0035] External force acts on the toggle end 6 of the limited part to push the limited part to rotate around the positioning hole 7 clamping plate column to a certain angle. The limited part pushes the first toggle arm 2 to move, causing the first elastic arm 4 in the pre-deformed state to deform significantly and generate greater stress inside.

[0036] In general structures, the structural spring positioning hole 1 is fixed by screws and cannot rotate around the clamping plate column at the positioning hole 1. Use Solidworks software to simulate the described structural action mode, such as Figure 8 The figure shows the stress diagram when the limited part is pushed to the limit position, that is, the first elastic arm 4 generates the maximum deformation. Stress concentration occurs at the first elastic arm 4, and the maximum stress reference value is 660MPa. Since the structural spring is fixed at the positioning hole 1, the second toggle arm 3 and the second elastic arm 5 remain in the assembled state and do not move.

[0037] The characteristic of the present invention is that the structural spring is not fixed at the positioning hole 1, but can rotate around the clamping plate column at the positioning hole 1. Fig. 9 The figure shows the structural limit position of the rotatable structural spring simulated by Solidworks software, that is, the stress diagram when the limited part is in the limit position. In the process of the limited part pushing the first toggle arm 2 to move, since the structural spring is not fixed, the structural spring as a whole rotates around the clamping column at the positioning hole 1, and the second toggle arm 3 at the other end slides on the side of the limited part 8 that does not move. Since the first toggle arm 3 and the second toggle arm 4 are both matched with the limited part, the rotation of the structural spring is restricted, so that the first elastic arm 4 and the second elastic arm 5 are deformed and stress is generated. Stress concentration occurs at the first elastic arm 4, with a maximum stress of 437MPa, which is about 34% lower than the maximum stress of the structural spring that cannot rotate.

[0038] When one end of the rotatable structural spring is moved by a limiting part, the first toggle arm 2 is displaced to a certain extent, and the deformation of the first elastic arm 4 is reduced due to the rotation of the structural spring, while the deformation of the second elastic arm 5 can be considered to alleviate the deformation of the first elastic arm 4.

[0039] Example 2

[0040] The assembly method and assembly status of each end of the three structural springs are similar to those in Example 1.

[0041] Solidworks software is used to simulate the working states of the three structural springs, such as Fig.10 The figure shows the stress diagram when the three-purpose structural spring cannot rotate around the clamping plate column at the positioning hole and pushes the part to reach the limit position at one end. The toggle arm and elastic arm at one end of the structural spring in contact with it play a role in limiting the movement of the part to be limited. The elastic arm at this end deforms to generate internal stress. The maximum stress reference value at the stress concentration point is 688MPa. Since the structural spring cannot rotate, the elastic arms at the other two ends are in the initial assembly state.

[0042] Simulate the working state of the rotatable three-purpose structural spring, such as Fig.11The figure shows the stress diagram when the three-purpose structural spring can rotate around the positioning hole and pushes the above-mentioned one-end limited part to the same limit position. The toggle arm at the working end is pushed by the limited part to move, and the elastic arm is deformed to generate internal stress. Since the structural spring can rotate around the clamping plate column at the positioning hole, the toggle arms at the other two ends slide on the side of the limited part in contact with it, and the corresponding elastic arms are deformed to a certain extent, generating internal stress. The stress is concentrated on the elastic arm at the working end, and the maximum stress reference value is 575MPa. Compared with the structural spring that cannot rotate, the maximum stress is reduced by about 16.4%.

[0043] The advantages of the other ends of the structural spring and the four or more structural springs when working are similar to those in the above embodiments and will not be repeated here.

[0044] Normally, the stress generated by deformation during the operation of a structural spring will not reach the material limit stress, but it will affect the reliability and safety of the structural spring. Moreover, the repeated action of such a large stress will greatly shorten the fatigue life of the material and shorten the working life of the parts.

[0045] Furthermore, the present invention provides a rotatable dual-purpose structural spring in a watch. When the toggle arm at one end is working, the toggle arm slides and the elastic arm deforms at the other end by virtue of the rotation of the structural spring around the splint column at the positioning hole, which can alleviate the deformation of the elastic arm at the working end, improve the working reliability of the structural spring, and ensure its working life.

[0046] The working principle of the structural spring suitable for the watch mechanism of the present invention is that the multi-purpose structural spring is installed on the clamping plate column through the positioning hole to form a clearance fit, and the limited part at one end is displaced to push the toggle arm in contact with it, and the structural spring rotates around the clamping plate column, so that the toggle arms at the other ends are slidably displaced on the limited parts in contact with it.

[0047] It is worth pointing out that the protection scope of the present invention is not limited to the above-mentioned specific examples. According to the basic technical concept of the present invention, the purpose of the present invention can also be achieved with basically the same structure. As long as ordinary technicians in this field can think of any implementation method without creative work, it belongs to the protection scope of the present invention.

Claims

1. A structural spring suitable for a watch mechanism, characterized in that: Including positioning hole, toggle arm, elastic arm; A plurality of elastic arms are formed on the periphery of the positioning hole to limit the plurality of limited parts; A toggle arm is formed at the end of the elastic arm, and the toggle arm contacts the limited part; The toggle end of the limited part pushes the limited part, and the limited part rotates, pushing the toggle arm to generate displacement, and the elastic arm to generate deformation. The deformed elastic arm generates a reaction force on the limited part to achieve limitation; The positioning hole is clearance-matched with the clamping plate column, and the structural spring rotates around the clamping plate column at the positioning hole to reduce deformation of the elastic arm.

2. The structural spring suitable for a watch mechanism according to claim 1, characterized in that: The positioning hole and the toggle arm are integrally formed or the positioning hole and the toggle arms are combined into one body.

3. The structural spring suitable for a watch mechanism according to claim 1, characterized in that: The plurality of elastic arms are installed on the same horizontal plane or are stacked up and down.

4. The structural spring suitable for a watch mechanism according to claim 1 or 3, characterized in that: The number of the elastic arms is 2 to 4.

5. The structural spring suitable for a watch mechanism according to claim 1 or 3, characterized in that: The elastic arm is made of spring steel, stainless steel or copper alloy.

6. The structural spring suitable for a watch mechanism according to claim 1 or 2, characterized in that: The toggle arm has a smooth arc shape, and the side roughness is less than 0.4 μm; the thickness of the elastic arm is greater than 0.2 mm.

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