Spring member and fastening structure

Abstract

A spring member according to the present invention generates a load in an axial direction. The spring member comprises a spring part having a cylindrical body part, and a collar which has a cylindrical shape and is stacked on the spring part, wherein the length of the spring part in the axial direction is longer than the length of the collar in the axial direction. In the body part, a plurality of slits penetrating in a direction orthogonal to the axial direction are formed, at least one slit being present in the axial direction.

Description

Spring member and fastening structure

[0001] The present invention relates to a spring member and a fastening structure.

[0002] Conventionally, when fastening a first member and a second member, a bolt is used, and the members are fastened together using the bolt and nut, or one member is fastened by screwing the bolt into the other member.

[0003] 11 to 13 are diagrams illustrating an example of a conventional fastening structure. Known structures for fastening a first member 201 and a second member 202 include a fastening structure 200 (see FIG. 11 ) that uses a bolt 203 and a nut 204 for fastening, a fastening structure 210 (see FIG. 12 ) that has a collar 205 disposed between the bolt 203 and the nut 204, and a fastening structure 220 (see FIG. 13 ) that uses the bolt 203 and the nut 204 for fastening and has a sheet material 206 made of rubber or the like disposed between the first member 201 and the second member 202 to suppress transmission of vibration from one member to the other member.

[0004] In addition to the fastening structure 220, a cylindrical vibration-damping material made of rubber or the like is provided and inserted into the shank of the bolt to prevent vibrations from one component from being transmitted to the other component (see, for example, Patent Document 1).

[0005] Japanese Patent Application Laid-Open No. 2016-176557

[0006] However, the vibration-damping material disclosed in Patent Document 1 deforms due to the load from bolts and other components, and because it expands outward when this occurs, it must be designed to be smaller in size to take this expansion into account, which could result in the risk of not being able to secure the load required for the vibration-damping material.In addition to suppressing vibration, vibration-damping materials are also required to regulate the amount of stroke of one component relative to the other component, for example to prevent damage to the other component, but this is difficult to adjust using only the elastic force of the vibration-damping material.

[0007] The present invention has been made in consideration of the above, and aims to provide a spring member and a fastening structure that can suppress the transmission of vibration between the members to be fastened and regulate the stroke amount of the members to be fastened and one member relative to the other member.

[0008] In order to solve the above-mentioned problems and achieve the object, the spring member of the present invention is a spring member that generates a load in the axial direction, and is characterized in that it comprises a spring portion having a cylindrical main body portion, and a cylindrical collar that is stacked on the spring portion, the axial length of the spring portion being longer than the axial length of the collar, the main body portion having a plurality of slits formed therein that penetrate in a direction perpendicular to the axial direction, and at least one of the slits being present in the axial direction.

[0009] In addition, the spring member of the present invention is characterized in that, in the above invention, the main body portion is formed by winding a band-shaped member around an axis, and an open end is formed by separating the ends in the winding direction.

[0010] Furthermore, in the spring member according to the present invention, the spring portion has a first spring portion and a second spring portion stacked on the first spring portion.

[0011] Furthermore, the spring member of the present invention is characterized in that, in the above invention, the main body portion is formed by winding a band-shaped member around an axis, and an open end is formed by separating the ends in the circumferential direction, and the open end of the first spring portion and the open end of the second spring portion are located at different positions from each other in the circumferential direction.

[0012] In addition, the spring member according to the present invention is characterized in that, in the above invention, the collar houses the spring portion.

[0013] Furthermore, the fastening structure according to the present invention comprises a first member, a second member, a fastening member that fastens the first member and the second member, and a spring member that generates a load in the axial direction, wherein the spring member has a spring portion having a cylindrical main body portion, and a cylindrical collar that is stacked on the spring portion, wherein the axial length of the spring portion is longer than the axial length of the collar, wherein the main body portion has a plurality of slits that penetrate in a direction perpendicular to the axial direction, wherein at least one of the slits is present in the axial direction, and wherein a straight line extending the axis of the spring member passes through the first and second members.

[0014] According to the present invention, it is possible to suppress the transmission of vibration between members to be fastened, and to regulate the stroke amount of one member relative to the other member.

[0015] FIG. 1 is a plan view showing a configuration of a fastening structure according to a first embodiment of the present invention. FIG. 2 is a view showing a configuration of a spring portion included in a spring member according to the first embodiment of the present invention. FIG. 3 is a perspective view showing a configuration of a spring portion included in a spring member according to the first embodiment of the present invention. FIG. 4 is a developed view of a spring portion included in a spring member according to the first embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of a spring portion included in a spring member according to the first embodiment of the present invention. FIG. 6 is a perspective view showing a configuration of a spring member according to a second embodiment of the present invention. FIG. 7 is a perspective view for explaining the configuration of a spring member according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view of a spring member according to the second embodiment of the present invention. FIG. 9 is a diagram for explaining the configuration of a spring portion included in a spring member according to a third embodiment of the present invention. FIG. 10 is a diagram for explaining the configuration of a spring portion included in a spring member according to a fourth embodiment of the present invention. FIG. 11 is a diagram (part 1) for explaining an example of a conventional fastening structure. FIG. 12 is a diagram (part 2) for explaining an example of a conventional fastening structure. FIG. 13 is a diagram (part 3) for explaining an example of a conventional fastening structure.

[0016] In the following description, a fastening structure and a spring member will be described as a form for carrying out the present invention (hereinafter referred to as an "embodiment"). The present invention is not limited to this embodiment. Furthermore, in the drawings, the same parts are denoted by the same reference numerals. Furthermore, it should be noted that the drawings are schematic, and the relationship between the thickness and width of each part, the ratio of each part, and the like may differ from reality. Furthermore, the drawings also include parts with different dimensions and ratios.

[0017] (First Embodiment) Fig. 1 is a plan view showing the configuration of a fastening structure according to a first embodiment of the present invention. The fastening structure 100 according to the first embodiment includes a first member 101, a second member 102, a bolt 103, a nut 104, and a spring member 1, and is configured by fastening the first member 101 and the second member 102 together using the bolt 103 and the nut 104. In the first embodiment, the bolt 103, the nut 104, and the spring member 1 form a set, and the fastening structure 100 has multiple sets of the bolt 103, the nut 104, and the spring member 1. For example, in the fastening structure, the first member 101 may be an engine, and the second member 102 may be a frame on which the engine is mounted. The bolt 103 and the nut 104 form a fastening member.

[0018] The spring member 1 generates a load in the direction of the axis N1 (see FIG. 5 ) and is disposed between the head of the bolt 103 and the first member 101. The spring member 1 has a cylindrical shape that penetrates in the direction of the axis N1. The spring member 1 has a spring portion 11 and a collar 12 that is stacked on the spring portion 11. In the fastening structure 100, the line extending from the axis N1 of the spring member 1 passes through the first member 101 and the second member 102. For example, in design, this line extending from the axis N1 coincides with the central axis of the shank of the bolt 103, but one line may be inclined relative to the other depending on how the load is applied and the assembly.

[0019] FIG. 2 is a diagram showing the configuration of a spring portion included in the spring member according to the first embodiment of the present invention. FIG. 3 is a perspective view showing the configuration of the spring portion included in the spring member according to the first embodiment of the present invention. FIG. 4 is a developed view of the spring portion included in the spring member according to the first embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of the spring portion included in the spring member according to the first embodiment of the present invention. FIG. 5(a) shows the spring member in a natural state where no load other than gravity is applied. FIG. 5(b) shows the spring member in a state where the first member 101 and the second member 102 are fastened together and where a load is applied from the head of the bolt 103. Note that the slit 112 is omitted in the cross section shown in FIG. 5.

[0020] The spring portion 11 is a belt-shaped member having a longitudinal direction along an axis N. 11 The main body 111 is formed by wrapping around the axis N1 (see FIG. 2). The main body 111 is formed by using, for example, a material with good load characteristics, such as carbon steel or stainless steel with a high elastic modulus. In the following description, the axis N1 and the axis N 11 Although the description will be given assuming that the two are aligned, they may be misaligned, or one may be inclined relative to the other.

[0021] The main body 111 is formed with slits 112 that extend in the circumferential direction of the band-shaped member (hereinafter simply referred to as the "circumferential direction") and penetrate the member in the thickness direction (e.g., the direction from the inner circumference to the outer circumference). The main body 111 also has an open end 113 formed by the circumferential end portions 111a and 111b facing each other. At this open end 113, the circumferential end portions 111a and 111b are spaced apart from each other in a natural state. Some of the slits 112 reach either the end portions 111a or 111b, forming recesses in the end portions 111a and 111b.

[0022] Here, the plurality of slits 112 formed in the main body 111 are formed in a houndstooth pattern in the developed view as shown in FIG. 4, for example, and extend in the width direction (axis N 11For example, at position A, there are two slits 112 in the width direction, and at position B, there are four slits 112 in the width direction.

[0023] The recesses formed in the end portions 111 a and 111 b may be formed at the same position in the axial direction and connected to each other in the circumferential direction, as shown in Fig. 2 etc., or may be formed at positions offset from each other in the axial direction. Also, the slit 112 may be formed so as not to reach either of the end portions 111 a and 111 b.

[0024] The collar 12 is cylindrical and the spring portion 11 is inserted therethrough. The collar 12 is formed, for example, from the same material as the spring portion 11 or a material having higher rigidity than the material forming the spring portion 11. Alternatively, at least one of the main body 111 and the collar 12 may be formed from a non-metallic material (e.g., resin). Here, the collar 12 is cylindrical and does not have a slit. The collar 12 is movable (or slidable) relative to the spring portion 11 in the direction of the axis N1.

[0025] As shown in FIG. 5, the height H1 of the spring portion 11 in its natural state is higher than the height H2 of the collar 12 (see FIG. 5(a)). 11 ) and corresponds to the length in the penetrating direction of the spring member 1 (axis N1 direction).

[0026] When the first member 101 and the second member 102 are fastened together, the spring portion 11 receives a load from the head of the bolt 103, and the spring portion 11 is compressed (see FIG. 5B). Here, the height of the spring portion 11 at this time of fastening is set to H3 (H2<H3

[0027] Furthermore, the difference ΔH between the height H3 and the height H2 in the fastened state is set, for example, according to the stroke amount of the first member 101 relative to the second member 102. In this case, for example, if the first member 101 strokes beyond an expected amount, the head of the bolt 103 abuts against the collar 12, thereby restricting the stroke from exceeding ΔH.

[0028] ​In the first embodiment described above, the spring member 1, which is formed by wrapping a band-shaped member around the longitudinal direction and has a spring portion 11 formed with a plurality of slits 112 disposed inside the collar 12, is provided between the first member 101 and the head of the bolt 103, so as to damp vibrations from the first member 101, for example, and to regulate the stroke amount of the first member 101 by the collar 12. According to the first embodiment, it is possible to suppress the transmission of vibrations between the members to be fastened, and to regulate the stroke amount of one member relative to the other member.

[0029] Furthermore, according to the first embodiment, the spring portion 11 generates a load in the direction of the axis N1, and therefore does not expand in a direction perpendicular to the direction of the axis N1 when deformed, allowing the spring member 1 to be made smaller in size in the direction perpendicular to the direction of the axis N1. In contrast, if a coil spring or a disc spring were used instead of the spring portion 11, these would deform in the direction perpendicular to the axial direction when deformed, making them unsuitable for making the spring member 1 smaller in size in this direction, and providing a collar on the outer periphery would suppress this deformation.

[0030] Furthermore, according to this embodiment 1, the spring portion 11 can follow and abut against a member, etc., so that the first member 101 and the second member 102 can be stably fastened together even when the parallelism between the first member 101 and the second member 102 is large.

[0031] Furthermore, according to the first embodiment, in the fastening structure 100, the spring portion 11 is disposed inside the collar 12, and therefore even if the spring portion 11 is damaged and broken by an impact or the like, the collar 12 prevents fragments from scattering to the outside. In this case, by making ΔH smaller than the plate thickness of the main body portion 111 of the spring portion 11, it is possible to more reliably prevent fragments of the main body portion 111 from scattering to the outside of the collar 12.

[0032] In the first embodiment described above, an example in which the spring portion 11 is disposed inside the collar 12 has been described, but a configuration in which the collar is disposed inside the spring portion may also be used. Furthermore, in addition to being disposed between the first member 101 and the head of the bolt 103 as in the first embodiment described above, the spring member 1 may also be disposed between the first member 101 and the second member 102, or between the second member 102 and the nut 104. The position in which the spring member 1 is disposed is not limited to the position in the first embodiment, as long as a straight line extending from the axis N1 of the spring member 1 passes through the first member 101 and the second member 102.

[0033] (Embodiment 2) Next, embodiment 2 of the present invention will be described with reference to Figs. 6 to 8. Fig. 6 is a perspective view showing the configuration of a spring member according to embodiment 2 of the present invention. Fig. 7 is a perspective view for explaining the configuration of a spring member according to embodiment 2 of the present invention. Fig. 8 is a cross-sectional view of the spring member according to embodiment 2 of the present invention. Note that slits are omitted in the cross section shown in Fig. 8. The spring member according to embodiment 2 includes a plurality of spring portions. Hereinafter, components that are the same as those in the embodiment will be assigned the same reference numerals, and descriptions thereof will be omitted.

[0034] The spring member 1A according to the second embodiment has a plurality of spring portions and a collar 12. In the second embodiment, an example having two spring portions (a first spring portion 11A and a second spring portion 11B) will be described. In the following description, the central axis of the spring member 1A and the central axes of the spring portions and the collar 12 are aligned with the axis N. 1A It will be explained as being consistent with

[0035] The first spring portion 11A is a belt-shaped member having a longitudinal direction along an axis N 1A The main body 111A is formed by wrapping around the main body 111A. The main body 111A is made of, for example, a material with good load characteristics, such as carbon steel or stainless steel with a high elastic modulus.

[0036] The main body 111A has a slit 112A that extends in the circumferential direction and penetrates through the thickness of the member. The main body 111A also has an open end 113A that is formed by the ends of the main body 111A facing each other in the circumferential direction, similar to the ends 111a and 111b.

[0037] The second spring portion 11B is housed within the first spring portion 11A. The second spring portion 11B is arranged such that the longitudinal direction of the belt-shaped member is aligned with the axis N. 1A The main body 111B is formed by wrapping around the main body 111B. The main body 111B is made of, for example, a material with good load characteristics, such as carbon steel or stainless steel with a high elastic modulus.

[0038] The main body 111B has a slit 112A that extends in the circumferential direction and penetrates through the thickness of the member. The main body 111B also has an open end 113B that is formed by the ends of the main body 111B facing each other in the circumferential direction, similar to the ends 111a and 111b.

[0039] Here, the multiple slits 112A, 112B formed in the main body portions 111A, 111B are formed in a houndstooth pattern in the developed view, and at least one slit is present in the width direction of the member. Furthermore, the positions of the opening ends 113A, 113B in the circumferential direction of the first spring portion 11A and the second spring portion 11B may be the same or different from each other. From the viewpoint of stabilizing the load, it is preferable that the positions of the opening ends of each spring portion in the circumferential direction are different, for example, the positions of the opening ends of each spring portion are different from each other, for example, the positions of the opening ends of each spring portion are different from each other. 1A It is preferable that they are provided at positions opposite to each other.

[0040] The first spring portion 11A and the second spring portion 11B may have the same spring constant or different spring constants, but from the viewpoint of stabilizing the generated load, it is preferable that the first spring portion 11A and the second spring portion 11B have the same spring constant.

[0041] The first spring portion 11A and the second spring portion 11B are inserted into the collar 12. The collar 12 is oriented in such a manner that the axis N is perpendicular to the first spring portion 11A. 1A It can move (or slide) in any direction.

[0042] As shown in Fig. 8, the height of the first spring portion 11A and the second spring portion 11B in the natural state is higher than the height of the collar 12. Although Fig. 6 and Fig. 8 show an example in which the height of the first spring portion 11A and the height of the second spring portion 11B are the same, they may be different from each other.

[0043] When the first member 101 and the second member 102 are fastened together, the first spring portion 11A and / or the second spring portion 11B is compressed by receiving a load from the head of the bolt 103. At this time, for example, if the stroke of the first member 101 exceeds an expected value, the head of the bolt 103 comes into contact with the collar 12, thereby restricting the stroke.

[0044] In the second embodiment described above, similarly to the first embodiment, the spring member 1A is formed by wrapping around the longitudinal direction of a belt-shaped member, and a plurality of spring portions with a plurality of slits 112 formed therein are disposed inside the collar 12, and by using this as the fastening portion, it is possible to suppress the transmission of vibration between the members to be fastened and to regulate the stroke amount of one member relative to the other member. 1A The size can be reduced in a direction perpendicular to the direction of fastening, and even if the members to be fastened have a high degree of parallelism, the members can be fastened together stably.

[0045] Furthermore, according to this second embodiment, since two spring parts are arranged, even if one spring part is damaged and destroyed by an impact or the like, the function of the spring member can be maintained by the other spring part.

[0046] Furthermore, according to this embodiment 2, the spring portion 11 is arranged inside the collar 12, so that even if the spring portion 11 is damaged and destroyed by an impact or the like, the collar 12 prevents fragments from scattering to the outside.

[0047] In the above-described second embodiment, an example in which the first spring portion 11A and the second spring portion 11B are disposed inside the collar 12 has been described, but the collar may be disposed inside the first spring portion 11A and the second spring portion 11B, or between the first spring portion 11A and the second spring portion 11B. Furthermore, a configuration in which three or more spring portions are provided may be used.

[0048] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 is a diagram for explaining the configuration of a spring portion provided in a spring member according to the third embodiment of the present invention. The spring member according to the third embodiment differs from the first embodiment in the shape of the slits formed in the spring portion. Hereinafter, the same components as those in the first embodiment will be given the same reference numerals, and descriptions thereof will be omitted.

[0049] In the third embodiment, slits 114 are formed in the main body 111 of the spring portion, extending in the circumferential direction and penetrating the member in the thickness direction. The slits 114 are provided with protruding wall portions 114a. The protruding amount of the protruding portion 114a is set according to the amount of deformation of the main body 111 and its restriction. The protruding direction of the protruding portions 114a in each slit 114 is the same. In the example shown in Fig. 9, the protruding portions 114a are provided on the lower side of the slit 114 and protrude upward.

[0050] In the above-described third embodiment, similar to the first embodiment, a spring member is used in the fastening portion, which is formed by wrapping a belt-shaped member around the longitudinal direction and has a plurality of spring portions formed with a plurality of slits 114 arranged inside collar 12. This suppresses the transmission of vibration between the members to be fastened and regulates the stroke amount of one member relative to the other member. Furthermore, according to the third embodiment, the spring member can be made smaller in size in the direction perpendicular to the axial direction, and can stably fasten the members together even when the members to be fastened are highly parallel.

[0051] Furthermore, according to the third embodiment, convex portions 114a are provided that protrude from the wall surfaces of slits 114, and when main body 111 is deformed, convex portions 114a come into contact with the opposing wall surfaces of slits 114, thereby suppressing excessive deformation of slits 114. As a result, deformation of main body 111 is restricted, and breakage, etc. is suppressed. Providing convex portions 114a in slits 114 makes it possible to prevent the amount of stroke of one member relative to the other member from exceeding the allowable amount.

[0052] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Fig. 10. Fig. 10 is a diagram for explaining the configuration of a spring portion provided in a spring member according to the fourth embodiment of the present invention. The spring member according to the fourth embodiment differs from the first embodiment in the shape of the slits formed in the spring portion. Hereinafter, the same components as those in the embodiments will be given the same reference numerals, and descriptions thereof will be omitted.

[0053] In the fourth embodiment, a slit 115 is formed in the main body 111 of the spring portion, extending in the circumferential direction and penetrating the member in the thickness direction. The slit 115 has an elongated hole shape with a large opening at both ends in the circumferential direction. While the example shown in Fig. 10 illustrates an example in which both ends of the slit 115 are circular, the slit may be elliptical, or the opening may gradually become smaller in size toward the center in the circumferential direction.

[0054] In the above-described fourth embodiment, similar to the first embodiment, a spring member is used in the fastening portion, which is formed by wrapping a belt-shaped member around the longitudinal direction and has a plurality of spring portions formed with a plurality of slits 115 and disposed inside collar 12. This makes it possible to suppress the transmission of vibration between the members to be fastened and to regulate the stroke amount of one member relative to the other member. Furthermore, according to the fourth embodiment, the spring member can be made smaller in size in the direction perpendicular to the axial direction, and can stably fasten the members together even when the members to be fastened are highly parallel.

[0055] Furthermore, according to the fourth embodiment, the slit 115 is formed so that both ends in the circumferential direction are large, thereby making it possible to further stabilize the load characteristics.

[0056] As such, the present invention can include various embodiments not described herein, and various design changes can be made without departing from the technical concept defined by the claims. For example, in the above-described first to fourth embodiments, an example was described in which the spring portion is formed by wrapping a strip-shaped member around the spring portion and separating the ends in the wrapping direction to form an open end, but the spring portion may be cylindrical and have no open end.

[0057] As described above, the spring member and fastening structure of the present invention are suitable for suppressing the transmission of vibration between the components to be fastened, and for regulating the stroke amount of the components to be fastened and one component relative to the other component.

[0058] REFERENCE SIGNS LIST 1, 1A Spring member 11 Spring portion 11A First spring portion 11B Second spring portion 12 Collar 100 Fastening structure 101 First member 102 Second member 103 Bolt (fastening member) 104 Nut (fastening member) 111 Main body 112, 114, 115 Slit 113, 113A, 113B Open end 114a Convex portion

Claims

1. A spring component that generates a load in the axial direction, comprising: a spring component having a cylindrical main body; and a cylindrical collar stacked on the spring component, wherein the axial length of the spring component is longer than the axial length of the collar, and the main body component has a plurality of slits formed therein that penetrate in a direction perpendicular to the axial direction, and at least one of the slits is present in the axial direction.

2. The spring member according to claim 1, characterized in that the main body is formed by winding a strip-shaped member around an axis, and the ends in the winding direction are separated to form an open end.

3. The spring member according to claim 1, wherein the spring portion comprises a first spring portion and a second spring portion stacked on the first spring portion.

4. A spring member as described in claim 3, characterized in that the main body portion is formed by winding a band-shaped member around an axis, and an open end is formed by separating the ends in the winding direction, and the open end of the first spring portion and the open end of the second spring portion are located at different positions in the winding direction.

5. The spring member according to claim 1, wherein the collar accommodates the spring portion.

6. A fastening structure comprising: a first member; a second member; a fastening member fastening the first member and the second member together; and a spring member generating a load in an axial direction, wherein the spring member has a spring portion having a cylindrical main body portion; and a cylindrical collar stacked on the spring portion, wherein the axial length of the spring portion is longer than the axial length of the collar, wherein a plurality of slits are formed in the main body portion and penetrate in a direction perpendicular to the axial direction, and wherein at least one of the slits is present in the axial direction, and wherein a straight line extending from the axis of the spring member passes through the first and second members.

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