Piezoelectric power generation member and rolling body for bearing

Abstract

The present invention relates to a piezoelectric power generation member and a rolling body for a bearing. The piezoelectric power generation member comprises a substrate, an electrode assembly, and a piezoelectric material, the electrode assembly and the piezoelectric material are fixed to the substrate, and the electrode assembly comprises a positive electrode and a negative electrode. The substrate is formed as a flexible sheet-like component extending along a wound curved surface wound around a longitudinal axis. The substrate comprises a first end edge and a second end edge which are opposite in the winding direction of the wound curved surface; the first end edge is a fixing end for fixing the substrate; the second end edge is a free end capable of moving relative to the first end edge by means of elastic deformation of the substrate; the electrode assembly extends in the substrate along the wound curved surface; and the piezoelectric material is arranged between the positive electrode and the negative electrode along the wound curved surface. The piezoelectric power generation member and the rolling body for the bearing of the present invention each have an improved structure.

Description

Piezoelectric power generation components and rolling elements for bearings Technical Field

[0001] This invention relates to the field of piezoelectric technology. Specifically, this invention relates to a piezoelectric power generation component and a rolling element for a bearing comprising such a piezoelectric power generation component. Background Technology

[0002] Piezoelectric materials are functional materials that exhibit the piezoelectric effect. Piezoelectric generators utilize this effect to produce electrical energy. These generators can be applied to moving parts to convert their kinetic energy into electrical energy, thereby powering active components. For example, a piezoelectric generator can be installed in the rolling elements of a bearing, using the vibration of the rolling elements to generate electricity to power active sensors, such as those in the bearing.

[0003] Piezoelectric power generation components typically include a substrate, electrodes, and piezoelectric materials. The substrate usually employs a cantilever beam structure, with one end fixed and the other end capable of vibration through the elastic deformation of the substrate. The electrodes and piezoelectric materials are both fixed to the substrate.

[0004] As disclosed in WO 2017073812 A1, in the prior art, the substrate is typically a straight, cantilever beam. Because this structure requires a large space, it is unsuitable for confined installation spaces. This limits the application scenarios of such piezoelectric power generation components. Furthermore, when using such a straight cantilever beam, the space used to accommodate the piezoelectric power generation component cannot be fully utilized. For example, in a cylindrical installation space, whether the straight cantilever beams are arranged radially or axially, a significant amount of space cannot be completely filled. Even with an array arrangement, some space remains between the individual cantilever beams to avoid interference. This limits the power generation efficiency and energy density of the piezoelectric power generation component.

[0005] Furthermore, although piezoelectric materials and substrates possess a degree of elasticity, their strength remains limited. Under significant bending, the cantilever beam is at risk of fracture, especially after prolonged operation. This can affect the lifespan of the piezoelectric power generation components.

[0006] Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to provide a piezoelectric power generation component and a rolling element for a bearing.

[0008] The aforementioned technical problem is solved by a piezoelectric power generation component according to the present invention. This piezoelectric power generation component includes a substrate, an electrode assembly, and a piezoelectric material, which are fixed to the substrate. The electrode assembly includes a positive electrode and a negative electrode. The substrate is formed as a flexible sheet-like component extending along a wound surface wound around a longitudinal axis. The substrate includes a first end edge and a second end edge opposite to each other along the winding direction of the wound surface. The first end edge is a fixed end for fixing the substrate, and the second end edge is a free end capable of moving relative to the first end edge through elastic deformation of the substrate. The electrode assembly extends along the wound surface within the substrate, and the piezoelectric material is disposed along the wound surface between the positive and negative electrodes. The piezoelectric material can elastically deform with the movement of the second end edge of the substrate, resulting in the accumulation of charge in the electrode assembly, thereby generating current in the circuit connected to the electrode assembly to achieve power generation. The substrate extends along the wound surface, allowing for an increase in the extension length of the substrate along the winding direction within a limited space. This arrangement increases both the distribution area of ​​the electrode assembly and the effective vibration length of the substrate, thereby improving the power generation performance of the piezoelectric power generation component.

[0009] According to a preferred embodiment of the present invention, the piezoelectric power generation component may further include a mass block fixed to the second end edge. When the substrate vibrates, the mass block can move relative to the first end edge along with the second end edge. By using the mass block fixed to the second end edge, the resonant frequency of the substrate can be adjusted to obtain the desired power generation effect.

[0010] According to another preferred embodiment of the invention, the first end edge and / or the second end edge may extend parallel to the longitudinal axis. In particular, the substrate may have a generally rectangular shape when unfolded into a plane. This shape of substrate has easily controllable vibration characteristics and is also easy to manufacture.

[0011] According to another preferred embodiment of the invention, the mass block may be a strip-shaped component extending parallel to the longitudinal axis and extending from one end of the second end edge to the other. This shape of mass block facilitates fixation and facilitates control of the vibration characteristics of the substrate.

[0012] According to another preferred embodiment of the invention, the substrate may include a carrier layer and a cover layer that are adjacently distributed along the thickness direction normal to the wound surface, and an electrode assembly is disposed between the carrier layer and the cover layer and extends along the wound surface. The carrier layer can provide structural support for the electrode assembly, while the cover layer can cover the electrode assembly opposite to the carrier layer to protect and isolate the electrode assembly.

[0013] According to another preferred embodiment of the present invention, the electrode assembly may be an interdigitated electrode assembly. Interdigitated electrode assemblies can achieve higher power generation efficiency.

[0014] According to another preferred embodiment of the present invention, the piezoelectric power generation component may further include a support member, to which the first end edge is fixed. The support member can be used to fix the fixed end of the substrate, and can also be connected and fixed to external components, such as the rolling elements of a bearing, thereby facilitating the installation of the piezoelectric power generation component to the external component.

[0015] According to another preferred embodiment of the invention, the support member can be formed as a cylindrical component surrounding a longitudinal axis, with a first end edge fixed to the radially inner surface of the support member, and the substrate extending radially inward from the first end edge. Such a support member can be directly fixed to the radially inner surface of an external component, with the free end of the substrate being the end edge wound radially inward. In this case, the second end edge can preferably be positioned to the longitudinal axis in a static, unloaded state, allowing the second end edge to move near the longitudinal axis during motion. This arrangement facilitates control of the vibration state of the free end of the substrate.

[0016] According to another preferred embodiment of the invention, the support member may include a central post and an end plate. The central post extends along a longitudinal axis, a first end edge is fixed to the central post, and a substrate extends radially outward from the first end edge. The axial end of the central post is fixed to the end plate, which is used to fix the support member. Such a support member can be fixed to an external component via the end plate and connected to the fixed end of the substrate via the central post. In this case, the free end of the substrate is the end edge wound radially outward.

[0017] The aforementioned technical problem is further solved by a rolling element for a bearing according to the present invention. The rolling element comprises a housing and a piezoelectric power generation component having the aforementioned features; the housing includes a cavity in which the piezoelectric power generation component is mounted. This rolling element possesses the corresponding advantages of the aforementioned piezoelectric power generation component.

[0018] According to a preferred embodiment of the present invention, the longitudinal axis of the piezoelectric power generation component can be arranged to coincide with the central axis of the housing. This allows the vibration state of the piezoelectric power generation component to adapt to the rolling state of the rolling element. Attached Figure Description

[0019] The invention is further described below with reference to the accompanying drawings. In the drawings, the same reference numerals represent elements with the same function. Wherein:

[0020] Figure 1 shows a schematic diagram of a piezoelectric power generation component according to an exemplary embodiment of the present invention;

[0021] Figure 2 shows a schematic diagram of a piezoelectric power generation component including a support member according to an exemplary embodiment of the present invention; and

[0022] Figure 3 shows a schematic diagram of a rolling element including a piezoelectric power generation component according to an exemplary embodiment of the present invention. Detailed Implementation

[0023] The following describes specific embodiments of the piezoelectric power generation component and the rolling element for the bearing according to the present invention, with reference to the accompanying drawings. The detailed description and drawings below are provided to illustrate the principles of the invention, and the invention is not limited to the described preferred embodiments; the scope of protection of the invention is defined by the claims.

[0024] According to embodiments of the present invention, a piezoelectric power generation component is provided. This piezoelectric power generation component is capable of converting kinetic energy (e.g., vibration from a component) into electrical energy using a piezoelectric material. For example, this piezoelectric power generation component can be installed in the rolling elements of a bearing to provide electrical energy to, for example, an active sensor in the bearing. Furthermore, this piezoelectric power generation component can be applied to other components that require electrical energy, such as shafts with active components mounted on them.

[0025] Figures 1 to 3 illustrate exemplary embodiments of this piezoelectric power generation component according to the present invention. This piezoelectric power generation component mainly includes a substrate 10, an electrode assembly 20, and a piezoelectric material 30. The electrode assembly 20 and the piezoelectric material 30 are fixed to the substrate 10, and the substrate 10 provides a supporting base for the electrode assembly 20 and the piezoelectric material 30.

[0026] Figure 1 is a perspective view of the piezoelectric power generation component of this embodiment, showing only the substrate 10 and electrode assembly 20 while omitting the piezoelectric material 30 and other components. As shown in Figure 1, the substrate 10 is formed as a flexible sheet-like component extending along a wound surface wound around a longitudinal axis. Therefore, the longitudinal axis is the central axis of the wound surface. The winding direction of the wound surface can be various helices around the longitudinal axis. The substrate 10 includes two end edges opposite each other along the winding direction (circumferential direction) of the wound surface, referred to as the first end edge 11 and the second end edge 12. The first end edge 11 is a fixed end for fixing the substrate 10, and the second end edge 12 is a non-fixed free end. Since the substrate 10 is made of a flexible material capable of elastic deformation, when the component on which the piezoelectric power generation component is mounted (e.g., the rolling element of a bearing) moves, particularly vibrates, the second end edge 12 can move, particularly vibrate, relative to the first end edge 11 through the elastic deformation of the substrate 10. The substrate 10 installed in this way can be regarded as a curved cantilever beam, so the motion principle of its free end is similar to that of a commonly known cantilever beam, and will not be described in detail here.

[0027] As is known in the art, a "sheet-like component" means that the dimensions of the substrate 10 in two dimensions defining the wound surface (i.e., the length direction along the winding direction and the width direction parallel to the longitudinal axis) are much larger (e.g., by several times or one or more orders of magnitude) than the dimensions in another dimension (i.e., the thickness direction normal to the wound surface), such that the substrate 10 can be approximated as extending only in space within the wound surface; however, in actual production, the substrate 10 can still have a certain thickness. For example, the substrate 10 may have a length of several centimeters along the winding direction, a width of several centimeters along the longitudinal direction (parallel to the longitudinal axis), and a thickness of several millimeters along the normal direction of the wound surface. These dimensions are merely illustrative and do not constitute a limitation of the invention; the substrate 10 may also have any other dimensions while conforming to the concept of a "sheet-like component."

[0028] Since the substrate 10 is arranged in a wound manner, the radial positions of the first end edge 11 and the second end edge 12 relative to the longitudinal axis are not the same; that is, one of them is located radially outward relative to the other. In the embodiments shown in Figures 1 to 3, the first end edge 11, as the fixed end, is located radially inward, while the second end edge 12, as the free end, is located radially outward. In other embodiments, alternatively, the first end edge 11, as the fixed end, may also be located radially outward, while the second end edge 12, as the free end, may be located radially inward accordingly.

[0029] As shown in Figure 1, the electrode assembly 20 disposed in the substrate 10 also extends substantially along the wound surface. The electrode assembly 20 includes a positive electrode 21 and a negative electrode 22 arranged opposite to each other. The positive electrode 21 and the negative electrode 22 can be connected to a circuit located outside the piezoelectric power generation component, thereby outputting electrical energy to external components (such as an active sensor in a bearing).

[0030] Figure 2 shows a perspective view of a piezoelectric power generation component including piezoelectric material 30. As shown in Figure 2, the piezoelectric material 30 is disposed (particularly filled) along a wound surface between the positive electrode 21 and the negative electrode 22 of the electrode assembly 20. The piezoelectric material 30 can be any material with a piezoelectric effect known in the prior art, such as piezoelectric ceramics, piezoelectric crystals, or piezoelectric polymers, and can have a sheet-like structure, a fibrous structure, a structure formed by powder sintering, or any other suitable structure. If a fibrous structure is used, the fiber extension direction of the piezoelectric material can preferably be approximately parallel to the longitudinal direction to reduce the risk of fiber breakage. When the second end edge 12 of the substrate 10 moves relative to the first end edge 11, the substrate 10 elastically deforms, and the piezoelectric material 30 is squeezed or stretched under stress to generate charges. These charges accumulate in the electrode assembly 20, and can then generate current in the circuit connected to the positive and negative electrodes of the electrode assembly 20 to achieve the effect of power generation. This arrangement can increase the distribution area of ​​the electrode assembly 20 on the one hand, and increase the effective vibration length of the substrate 10 on the other hand, thereby improving the power generation performance of the piezoelectric power generation component.

[0031] When viewed along the longitudinal axis, the wound substrate 10 can have a generally spiral shape. The substrate 10 includes two opposing side edges 13 along the longitudinal direction (width direction). The wound surface can be substantially parallel to the longitudinal axis, such that the projections of the two side edges 13 of the substrate 10 along the longitudinal direction substantially coincide, and the projection of the entire substrate 10 along the longitudinal direction also substantially coincides with the two side edges 13. In other words, the orthographic projection of the entire piezoelectric power generation component along the longitudinal direction is approximately a spiral curve extending along the winding direction.

[0032] In a preferred embodiment, the first end edge 11 and / or the second end edge 12 of the substrate 10 may extend parallel to the longitudinal axis; and / or, the two side edges 13 of the substrate 10 may extend parallel to the wound surface, particularly substantially parallel to the winding direction, i.e., extending in a plane perpendicular to the longitudinal axis. In particular, the wound substrate 10 preferably has a generally rectangular shape when unfolded into a plane. This gives the substrate 10 a simple shape, which is not only easy to process but also facilitates control of the vibration state of the substrate 10 after mounting.

[0033] Preferably, the piezoelectric power generation component may additionally include a mass block 40 fixed to the second end edge 12. When the substrate 10 elastically deforms or vibrates, the mass block 40 can move relative to the first end edge 11 along with the second end edge 12. By attaching the mass block 40 to the second end edge 12, the vibration characteristics of the substrate 10, particularly its natural frequency, can be easily controlled and adjusted to obtain the desired power generation parameters. When the second end edge 12 extends parallel to the longitudinal axis, the mass block 40 is preferably formed as a strip-shaped component extending parallel to the longitudinal axis and extending from one longitudinal end of the second end edge 12 to the other, i.e., extending in the longitudinal direction to cover the entire second end edge 12. Such a strip-shaped component may have a circular, square, polygonal, or other shaped cross-section, which is not limited by the present invention.

[0034] To prevent the electrode assembly 20 disposed in the substrate 10 from directly contacting external components, the electrode assembly 20 and the piezoelectric material 30 are preferably encased within the substrate 10. In a preferred embodiment, the substrate 10 may include a carrier layer and a cover layer (not shown), each extending along a wound surface and distributed adjacently along the thickness direction normal to the wound surface. The electrode assembly 20 is disposed between the carrier layer and the cover layer and extends substantially along the wound surface. The piezoelectric material 30 is also disposed between the carrier layer and the cover layer and is disposed in the wound surface between the positive electrode 21 and the negative electrode 22. The electrode assembly 20 and the piezoelectric material 30 are thus encased within the substrate 10. Specifically, the carrier layer serves to provide a support substrate with a certain strength and elasticity for the substrate 10, and may be made of, for example, a flexible metal sheet (such as steel, aluminum, etc.), which may be surface-insulated to insulate it from the electrode assembly 20. The electrode assembly 20 may be fixed to one side surface of the carrier layer, for example, by adhesive or other means. The cover layer is used to cover the electrode assembly 20 opposite to the carrier layer in order to protect the electrode assembly 20 from the influence of the external environment. The cover layer may be an insulating thin layer coated on one side surface of the carrier layer, such as an epoxy resin film or other insulating material film.

[0035] Electrode assembly 20 can have various shapes and structures. For example, in a preferred embodiment, electrode assembly 20 can be an interdigitated electrode assembly. An interdigitated electrode is a known electrode structure. Specifically, as shown in FIG1, positive electrode 21 may include a base segment 21a and a plurality of interdigitated segments 21b, while negative electrode 22 may include a base segment 22a and a plurality of interdigitated segments 22b. The base segments 21a and 22a of the two electrodes extend parallel to each other along the winding direction in a plane perpendicular to the longitudinal axis and are spaced apart in the longitudinal direction. A plurality of interdigitated segments 21b or 22b of the same electrode 21 or 22 are connected into a whole by corresponding base segments 21a or 22a. Each interdigitated segment 21b or 22b extends substantially in the longitudinal direction from the corresponding base segment 21a or 22a toward the base segment 22a or 21a of the opposite electrode, but does not contact or reach the base segment 22a or 21a of the opposite electrode. The interdigitated segments 21b of the positive electrode 21 and the interdigitated segments 22b of the negative electrode 22 are arranged alternately along the winding direction. As shown in FIG2, a corresponding piezoelectric material 30 is filled between each pair of adjacent interdigitated segments 21b and 22b along the winding direction. Alternatively, in other embodiments, the electrode assembly 20 may also adopt any other shape and structure known in the prior art.

[0036] To facilitate the installation of the piezoelectric power generation component, in a preferred embodiment, the piezoelectric power generation component may additionally include a support member 50. Figure 2 shows a piezoelectric power generation component including the support member 50. As shown in Figure 2, a first end edge 11, serving as a fixed end, is fixed to the support member 50. The piezoelectric power generation component can be mounted to an external component, such as the rolling elements of a bearing, via the support member 50. The support member 50 can have various different configurations.

[0037] For example, as shown in FIG2, in one configuration, the support member 50 may include a central post 51 and an end plate 52. The central post 51 extends along a longitudinal axis, and a first end edge 11 is fixed to the central post 51. A base plate 10 extends radially outward from the first end edge 11. At this time, the first end edge 11, as the fixed end, is located radially inward, while the second end edge 12, as the free end, is located radially outward. One axial end of the central post 51 is fixed to the end plate 52. The end plate 52 is used to fix the support member 50. The end plate 52 may, for example, be formed as a plate perpendicular to the longitudinal axis (e.g., a circular plate), which can be fixed to an external component, such as the rolling elements of a bearing, by means of interference fit, bonding, or welding.

[0038] Alternatively, in another configuration, the support 50 can also be formed as a cylindrical component around a longitudinal axis, such as a cylindrical tube. A first end edge 11 is fixed to the radially inner surface of the cylindrical support 50, and the substrate 10 extends radially inward from the first end edge 11. In this case, the first end edge 11, as the fixed end, is located radially outward, while the second end edge 12, as the free end, is correspondingly located radially inward. The cylindrical support 50 can be fixed to an external component, such as the rolling elements of a bearing, via its radially outer surface (e.g., by interference fit, bonding, or welding). In this case, the second end edge 12 can preferably be positioned approximately to the longitudinal axis in a stationary state without load, allowing the second end edge 12 to move near the longitudinal axis, particularly vibrating around the longitudinal axis, during motion.

[0039] In a further preferred embodiment, regardless of how the substrate 10 is mounted and fixed, the portion of the substrate 10, except for the fixed end (first end edge 11), does not contact other components (including external components and / or support members 50, etc.) in both static and dynamic states. This avoids interference with vibrations at the free end of the substrate 10.

[0040] According to an embodiment of the present invention, a rolling element for a bearing is also provided. This rolling element includes a housing 60 and a piezoelectric power generation member according to the above embodiment. As shown in FIG. 3, the housing 60 includes a cavity in which the piezoelectric power generation member is mounted. The housing 60 may be, for example, a cylindrical, drum-shaped, or other shaped rolling element housing. The housing 60 has its own central axis (not the central axis of the rolling path) around which the rolling element rolls when mounted in the bearing. The cavity of the housing 60 may be a cavity formed around the central axis of the rolling element, having at least one axial opening for mounting the piezoelectric power generation member. For example, the cavity may be a cavity extending through the housing 60 along the central axis direction. When the piezoelectric power generation member includes a support 50, the piezoelectric power generation member can be fixed to the cavity of the housing 60 by the support 50, for example, by a cylindrical support 50 or a plate-shaped end plate 52 fixed to the radially inner surface of the cavity. Preferably, the longitudinal axis of the piezoelectric power generation member may be arranged to coincide with the central axis of the housing 60. In addition, the piezoelectric power generation component installed in the housing 60 does not protrude outside the cavity of the housing 60 to avoid interference with the external structure.

[0041] The piezoelectric power generation component according to the present invention has a wound base structure, thereby enabling full filling and efficient utilization of limited space. The wound piezoelectric power generation component not only facilitates arrangement and installation but also achieves greater power generation efficiency. The wound piezoelectric power generation component exhibits more complex vibration modes, and its weight and size can be adjusted as needed to obtain complex vibration response characteristics for a wider range of vibration excitation sources, allowing the piezoelectric power generation component to harvest energy more effectively. Furthermore, due to the wound structure of the base plate, this piezoelectric power generation component is less prone to breakage under bending or vibration conditions, thus exhibiting higher reliability and a longer service life. The rolling element according to the present invention also possesses the corresponding advantages of the piezoelectric power generation component.

[0042] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of the invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes, particularly regarding the function and structure of the components, can be made without departing from the scope of the claims.

[0043] Table 10: Substrate; 11: First end edge; 12: Second end edge; 13: Side edge; 20: Electrode assembly; 21: Positive electrode; 21a: Base segment; 21b: Interdigitated segment; 22: Negative electrode; 22a: Base segment; 22b: Interdigitated segment; 30: Piezoelectric material; 40: Mass block; 50: Support member; 51: Central column; 52: End plate; 60: Housing.

Claims

1. A piezoelectric power generation component, comprising a substrate (10), an electrode assembly (20), and a piezoelectric material (30), wherein the electrode assembly (20) and the piezoelectric material (30) are fixed to the substrate (10), and the electrode assembly (20) comprises a positive electrode (21) and a negative electrode (22). Its features are, The substrate (10) is formed as a flexible sheet-like component extending along a wound surface wound around a longitudinal axis. The substrate (10) includes a first end edge (11) and a second end edge (12) opposite to each other along the winding direction of the wound surface. The first end edge (11) is a fixed end for fixing the substrate (10), and the second end edge (12) is a free end that can move relative to the first end edge (11) by elastic deformation of the substrate (10). The electrode assembly (20) extends along the wound surface in the substrate (10), and the piezoelectric material (30) is disposed along the wound surface between the positive electrode (21) and the negative electrode (22).

2. The piezoelectric power generation component according to claim 1, characterized in that, The piezoelectric power generation component also includes a mass block (40), which is fixed to the second end edge (12).

3. The piezoelectric power generation component according to claim 2, characterized in that, The first end edge (11) and / or the second end edge (12) extend parallel to the longitudinal axis.

4. The piezoelectric power generation component according to claim 3, characterized in that, The mass block (40) is a strip-shaped component that extends parallel to the longitudinal axis and extends from one end of the second end edge (12) to the other end.

5. The piezoelectric power generation component according to claim 1, characterized in that, The substrate (10) includes a carrier layer and a cover layer that are adjacently distributed along the thickness direction normal to the wound surface, and the electrode assembly (20) is disposed between the carrier layer and the cover layer and extends along the wound surface.

6. The piezoelectric power generation component according to claim 1, characterized in that, The electrode assembly (20) is an interdigitated electrode assembly.

7. The piezoelectric power generation component according to any one of claims 1 to 6, characterized in that, The piezoelectric power generation component also includes a support member (50), and the first end edge (11) is fixed to the support member (50).

8. The piezoelectric power generation component according to claim 7, characterized in that, The support member (50) is formed as a cylindrical component around the longitudinal axis, the first end edge (11) is fixed to the radially inner surface of the support member (50), and the substrate (10) extends radially inward from the first end edge (11).

9. The piezoelectric power generation component according to claim 8, characterized in that, The second end edge (12) is positioned to the longitudinal axis in a static state without load, so that the second end edge (12) can move near the longitudinal axis in a moving state.

10. The piezoelectric power generation component according to claim 7, characterized in that, The support member (50) includes a central column (51) and an end plate (52). The central column (51) extends along the longitudinal axis. A first end edge (11) is fixed to the central column (51). The base plate (10) extends radially outward from the first end edge (11). The axial end of the central column (51) is fixed to the end plate (52). The end plate (52) is used to fix the support member (50).

11. A rolling element for a bearing, characterized in that, The rolling element includes a housing (60) and a piezoelectric power generation component according to any one of claims 1 to 10, the housing (60) including a cavity in which the piezoelectric power generation component is mounted.

12. The rolling element according to claim 11, characterized in that, The longitudinal axis of the piezoelectric power generation component is arranged to coincide with the central axis of the housing (60).

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