Preload measuring apparatus of rolling bearing
First Claim
1. A preload measuring apparatus for measuring a preload of a rolling bearing which includes an inner race member, an outer race member, and a plurality of rolling elements rotatably interposed between said inner race member and said outer race member, said preload measuring apparatus comprising:
- a bearing support member supporting both ends of said inner race member in the axial direction of said rolling bearing;
a pressurization member loading a predetermined load to one of said both ends of said inner race member in the axial direction through said bearing support member;
an excitation member applying a vibration to said inner race member in the axial direction while said predetermined load is loaded on said inner race member by said pressurization member;
a vibration sensor detecting a vibration which is generated on said outer race member and is caused by the vibration of said inner race member; and
a controller capable of calculating a resonance frequency of said rolling bearing through an output signal of said vibration sensor and also calculating a true preload of said rolling bearing in accordance with the thus calculated resonance frequency, said true preload defining a preload of said rolling bearing before the predetermined load is loaded on said inner race member.
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Accused Products
Abstract
A preload measuring apparatus to measure the preload of a rolling bearing that includes a bearing support, a pressurization device, an excitation device, a vibration sensor, and a control section. The bearing support supports a rolling bearing by supporting both ends of a shaft inserted into an inner ring of the rolling bearing. The pressurization device loads a predetermined weight in the axial direction onto the rolling bearing. The excitation device applies vibration onto the rolling bearing by the drive of the piezoelectric elements. The vibration sensor detects the vibration generated on the rolling bearing by the vibration application of the excitation device. The control section operates the excitation device in the situation that the pressurization device presses the rolling bearing, and obtains the resonance frequency by the output signal from the vibration sensor and calculates the preload of the rolling bearing according to the obtained resonance frequency before the predetermined weight as loaded.
76 Citations
14 Claims
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1. A preload measuring apparatus for measuring a preload of a rolling bearing which includes an inner race member, an outer race member, and a plurality of rolling elements rotatably interposed between said inner race member and said outer race member, said preload measuring apparatus comprising:
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a bearing support member supporting both ends of said inner race member in the axial direction of said rolling bearing;
a pressurization member loading a predetermined load to one of said both ends of said inner race member in the axial direction through said bearing support member;
an excitation member applying a vibration to said inner race member in the axial direction while said predetermined load is loaded on said inner race member by said pressurization member;
a vibration sensor detecting a vibration which is generated on said outer race member and is caused by the vibration of said inner race member; and
a controller capable of calculating a resonance frequency of said rolling bearing through an output signal of said vibration sensor and also calculating a true preload of said rolling bearing in accordance with the thus calculated resonance frequency, said true preload defining a preload of said rolling bearing before the predetermined load is loaded on said inner race member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
a pressurization detect member detecting a pressure of said inner race member which is loaded by the pressurization member;
wherein when an output of said pressurization detect member reaches a predetermined value, said excitation member begins to apply said vibration to said inner race member.
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6. The preload measuring apparatus according to claim 1, wherein said excitation member comprises:
at least two piezoelectric elements applying vibration to said inner race member while loading said predetermined load on said inner race member in the axial direction, said piezoelectric elements having reverse phases and the same amplitudes with respect to each other.
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7. The preload measuring apparatus according to claim 1, further comprises:
a weight member attached to the outer race member, wherein said vibration sensor detects said vibration of outer race member through said weight member.
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8. The preload measuring apparatus according to claim 1, wherein the loading operation of said pressurization member is stopped when a resonance frequency output from the vibration sensor coincides with a predetermined frequency.
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9. The preload measuring apparatus according to claim 5, wherein the loading operation of said pressurization member is stopped when a resonance frequency output from the vibration sensor coincides with a predetermined frequency.
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10. The preload measuring apparatus according to claim 1, wherein said inner race member comprises an inner ring having at least one end surface in the axial direction to which said predetermined load of said pressurization member is loaded.
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11. The preload measuring apparatus according to claim 2, wherein said inner ring has at least one end surface in the axial direction to which said predetermined load of said pressurization member is loaded.
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12. The preload measuring apparatus according to claim 3, wherein said inner ring has at least one end surface in the axial direction to which said predetermined load of said pressurization member is loaded.
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13. The preload measuring apparatus according to claim 7, wherein said inner race member comprises an inner ring having at least one end surface in the axial direction to which said predetermined load of said pressurization member is loaded.
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14. The preload measuring apparatus according to claim 1, wherein the vibration applied by said excitation member to said inner race member in the axial direction is a vibration which has a region including a resonance frequency of the rolling bearing.
Specification