JPWO2020105010A5

JPWO2020105010A5 -

Info

Publication number: JPWO2020105010A5
Application number: JP2021528929A
Authority: JP
Publication date: 2022-11-18
Anticipated expiration: 2039-11-22

Claims

- a bearing housing (2) configured to be fixed to the mounting structure (S) and defining at least one seat (2c) for the bearing (3);
- a support pre-arranged to be at least partially arranged between said mounting structure (S) and said bearing housing (2), either directly or by interposition of at least one further element (7; 7'); a sensored support base (4) having (4′);
Said support (4') extends in longitudinal direction (L) and transverse direction (W) and is directly or through the interposition of at least one further element (7; 7') said bearing housing (2) and said having a detection surface (4c) configured to lie in one corresponding surface (6a; Sa) of the mounting structure (S);
said sensored support base (4) comprises mechanical stress sensor means,
said mechanical stress sensor means comprises at least one piezoelectric transducer (10; 20; 10 ₁ , 10 ₂ ) defining at least part of said sensing surface (4c);
The at least _one piezoelectric transducer (10; 20; 101, 102) is configured to generate a potential difference substantially proportional to the magnitude of mechanical stress (SS) applied to the bearing housing ( ₂ ). A sensored bearing support device (1).

The at least one piezoelectric transducer (10; 20) comprises respective layers (11; 21) of piezoelectric material and at least one first electrode (E1; E21) and one second electrode (E2; E22). prepared,
said layer of piezoelectric material (11; 21) extending at least partially between said first electrode (E1; E21) and said second electrode (E2; E22);
Preferably said first electrode (E1) and said second electrode (E2) respectively extend on two opposite main surfaces (11a, 11b; 21a, 21b) of said layer of piezoelectric material (11; 21). 2. The device of claim 1, wherein a device is present.

The layer (11; 21) of piezoelectric material extends transversely to at least one of the longitudinal direction (L), the lateral direction (W) and the plane specified by the support (4'). 3. A device according to claim 1 or 2, having an existing polarization axis (PA).

said at least one piezoelectric transducer (10; 10 ₁ , 10 ₂ ) being a first piezoelectric transducer (10 ₁ ) configured to generate a first potential difference exhibiting a first shear stress (SS); a second piezoelectric transducer (10 ₂ ) configured to generate a second potential difference indicative of a second shear stress (SS);
Preferably said first piezoelectric transducer (10 ₁ ) and said second piezoelectric transducer (10 ₂ ) are
- said first piezoelectric transducer (10 ₁ ) is designed to detect shear stress in a first direction and said second piezoelectric transducer (10 ₂ ) is designed to detect shear stress in a second direction; , wherein said first direction and said second direction are approximately transverse or inclined with respect to _each other; and/or - said layer of piezoelectric material (11 ) has a polarization axis (PA) extending transversely to said longitudinal direction (L), and/or - said layer (11) of said piezoelectric material of said second piezoelectric transducer (10 ₂ ) is 4. A device according to any one of the preceding claims, arranged to have a polarization axis (PA) extending transversely to said lateral direction (W).

The at least _one piezoelectric transducer (10; 20; 101, 102) is configured to generate a potential difference substantially proportional to the shear stress (SS) applied to the bearing housing ( ₂ ) . and at least one of a second piezoelectric transducer (20) configured to generate a potential difference substantially proportional to the normal stress applied to said bearing housing (2). Item 4. Apparatus according to any one of Items 1 to 3.

Each of the first electrode (E1) and the _second electrode (E2) of the at least _one piezoelectric transducer (10; 101, 102) is connected to the first electrode of the layer of piezoelectric material (11), respectively. 5. A device according to any one of claims 2 to 4, comprising a plurality of portions or fingers (F1, F2) extending in the main surface (11a) and the second main surface (11a, 11b).

Said at least one piezoelectric transducer (10; 10 ₁ , 10 ₂ ) is at least one transducer extending on a first main surface (11a) and a second main surface (11b) respectively of said layer of piezoelectric material (11). 5. A device according to any one of claims 2 to 4, comprising two third electrodes (E3) and one fourth electrode (E4).

- said third electrode (E3) has respective portions or fingers (F3) which are in a form interdigitated or staggered with portions or fingers (F1) of said first electrode (E1), Said fourth electrode (E4) has respective portions or fingers (F4) which are configured to interlock or stagger with portions or fingers (F2) of said second electrode (E2), preferably Claim 6 and wherein said first electrode (E1), said second electrode (E2), said third electrode (E3) and said fourth electrode (E4) are substantially comb electrodes. 7. Apparatus according to 7.

At least some of said first electrode (E1), said second electrode (E2), said third electrode (E3) and said fourth electrode (E4) are adapted to the polarization of said layer of piezoelectric material. 9. A device according to claim 7 or 8, which is an electrode or both a polarization electrode and a measurement electrode of the layer (11) of piezoelectric material.

Said at least _one piezoelectric transducer (10; 20; 101, 102) comprises a deposited layer (11; 21) of piezoelectric material and _two opposing deposited layers of said piezoelectric material (11; 21). 10. Apparatus according to any one of the preceding claims, comprising deposited electrodes of electrically conductive material (E1-E4; E22, E23) on the main surfaces (11a, 11b; 21a, 21b) which face each other.

at least one intermediate layer or element (7; 7′) suitable for transmitting mechanical stresses to the supporting base (4) with sensor, for example a polymer, or adhesive, or resin, or lower cover, said 11. Apparatus according to any one of the preceding claims, placed between a detection surface (4c) and said corresponding surface (6c; Sa).

12. A device as claimed in any one of the preceding claims, wherein the support (4') comprises an element (B) for positioning with respect to the bearing housing ( 2 ) and/or vice versa.

said bearing housing (2) defines a positioning pedestal (6) for receiving at least a portion of said sensored support base (4);
13. Apparatus according to any one of the preceding claims, wherein the positioning seat (6) is preferably bounded by a peripheral edge (2d) and/or preferably has a substantially planar bottom surface.

14. A method for obtaining a sensored support device according to any one of claims 1 to 13, comprising:
i) providing the support (4′) of the sensored support base (4) with a preferably planar detection surface (4c);
ii) comprising at least one first electrode (E1) at least partially on said first main surface (11a) of said layer of piezoelectric material (11) and said second electrode of said layer of piezoelectric material (11); forming at least one said piezoelectric transducer (10; 10 ₁ , 10 ₂ ) comprising at least one second electrode (E2) at least partially on a main surface (11b) of
iii) performing a poling of said layer (11) of piezoelectric material;
iv) placing the sensored support base (4) between the mounting structure (S) and the bearing housing (2);
- A method, wherein step ii) is preferably performed by successive deposition of different material layers (4').

A method for detecting stress in a bearing housing comprising:
i) providing a sensored support device according to any one of claims 1 to 13;
ii) said mounting structure (S), comprising said support (4′) of said support base (4) with sensor located at least partially between said bearing housing (2) and said mounting structure (S); fixing said bearing housing (2) to
iii) a potential difference substantially proportional to at least one of shear stress (SS) and normal stress transmitted by said at least _one piezoelectric transducer (10; 20; 101, 102) to said bearing housing ( ₂ ); and generating a.

A sensored support base for a bearing housing, comprising:
A support (4') prearranged to be arranged between a mounting structure (S) and said bearing housing (2), said support (4') being longitudinally (L) and laterally one corresponding surface (6a; Sa) of said bearing housing (2) and said mounting structure (S), extending in direction (W), either directly or through the interposition of at least one further element (7; 7'). said sensored support base (4) comprises a support (4') comprising a mechanical stress sensor means, having a sensing surface (4c) configured as in
said mechanical stress sensor means comprises at least one piezoelectric transducer (10; 20; 10 ₁ ; 10 ₂ ) defining at least part of said sensing surface (4c);
The at least one piezoelectric transducer ( ₁₀ ; 20; 101; 102) is configured to generate a potential difference substantially proportional to the magnitude of mechanical stress (SS) applied to the bearing housing ( ₂ ). support base with sensor.