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Grease composition, bearing prelubricated with grease, and rotation-transmitting apparatus with built-in one-way clutch

A technology of grease composition and grease seal, applied in the direction of one-way clutches, lubricating compositions, clutches, etc., can solve problems such as insufficient countermeasures, and achieve the effect of preventing peeling or friction and wear

Inactive Publication Date: 2008-04-16
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] However, as the operating conditions of rolling bearings under oil lubrication have become more severe in recent years, the method of adding these additives cannot provide sufficient countermeasures.

Method used

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  • Grease composition, bearing prelubricated with grease, and rotation-transmitting apparatus with built-in one-way clutch
  • Grease composition, bearing prelubricated with grease, and rotation-transmitting apparatus with built-in one-way clutch
  • Grease composition, bearing prelubricated with grease, and rotation-transmitting apparatus with built-in one-way clutch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～ Embodiment 1-5

[0175] In half the amount of the base oil shown in Table 1-1, dissolve 4,4-diphenylmethane diisocyanate (trade name Mirione MT manufactured by Nippon Polyurethane Industry Co., Ltd., hereinafter referred to as MDI), in the remaining half of the base oil, dissolve the monoamine that becomes 2 times the equivalent of MDI. The mix proportions and types are shown in Table 1-1.

[0176] While stirring the solution in which MDI is dissolved, add the solution in which monoamine is dissolved, and then continue to stir at 100-120°C for 30 minutes to make it react, so that the diurea compound is formed in the base oil.

[0177] Add organic bismuth and antioxidant to it according to the compounding ratio shown in Table 1-1, and stir at 100-120°C for 10 minutes. Thereafter, it was cooled and homogenized using triple rollers to obtain a grease composition.

[0178] In Table 1-1, the synthetic hydrocarbon oil used as base oil has a kinematic viscosity of 47mm at 40°C 2 Nippon Steel Chemi...

Embodiment 1-6～ Embodiment 1-10

[0195] Embodiment 1-6~Example 1-10, Embodiment 1-13, Embodiment 1-14

[0196] In half the amount of base oil shown in Table 1-2, dissolve 4,4-diphenylmethane diisocyanate (MDI) in the ratio shown in 1-2, and dissolve it in the remaining half of the base oil to become 4 , 2 times the equivalent of 4-diphenylmethane diisocyanate monoamine. The mix proportions and types are shown in Table 1-2.

[0197] While stirring the solution containing 4,4-diphenylmethane diisocyanate, add the solution in which monoamine is dissolved, and then continue to stir at 100-120°C for 30 minutes to allow the reaction to generate a diurea compound in the base oil.

[0198] Add inorganic bismuth or organic bismuth without sulfur component and antioxidant to it according to the compounding ratio shown in Table 1-2, and then stir at 100-120°C for 10 minutes. Thereafter, it was cooled and homogenized using triple rollers to obtain a grease composition.

[0199] In Table 1-2 and Table 1-3, the alkyl di...

Embodiment 1-11 and Embodiment 1-12

[0208] Add Li-12-hydroxystearate to the base oil shown in Table 1-2, and heat to dissolve at 200°C while stirring. Furthermore, each compounding ratio is shown in Table 1-2. Then cool, add inorganic bismuth or organic bismuth without sulfur component and antioxidant according to the mixing ratio shown in Table 1-2, use triple rollers to homogenize, and prepare a grease composition. For this grease composition, the high-temperature high-speed test 1 and the rapid acceleration and deceleration test 2 were performed in the same manner as in Examples 1-6. However, considering the heat resistance of Li soap grease, the high temperature and high speed test 1 was carried out at 150°C.

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Abstract

A grease composition which can effectively prevent the flaking on, e.g., rolling / sliding surfaces mainly caused by hydrogen embrittlement; a prelubricated bearing containing the grease composition enclosed therein; and a rotation-transmitting apparatus of the built-in one-way clutch type which contains the grease composition enclosed in the sliding part. The grease composition is obtained by incorporating an additive into a base grease comprising a base oil and a thickener. The grease composition can prevent hydrogen embrittlement and resultant flaking from occurring on the frictional / wearing surfaces of a sliding part or on a ferrous metal surface newly exposed by wearing. The additive comprises a bismuth additive or a magnesium additive, the bismuth additive being at least one member selected among inorganic bismuth compounds and organobismuth compounds containing no sulfur ingredient and the magnesium additive being at least one member selected among inorganic magnesium compounds and organomagnesium compounds.

Description

technical field [0001] The present invention relates to a grease composition mainly capable of effectively preventing peeling of rolling surfaces caused by hydrogen embrittlement, and a grease-enclosed bearing enclosing the grease composition. [0002] In particular, automotive electrical installations related to fan couplings, alternators, idlers, electromagnetic clutches for automotive air conditioners, electric fan motors, etc. - Rolling bearings for auxiliary machines, grease sealing for motors for industrial machinery and electrical installation equipment Type bearings, rolling bearings for fuel cell systems used in pressure feeders for pressure feeding various fluids in fuel cell systems, rolling bearings for robots used in operating parts of industrial robots, etc. Grease-packed bearings such as rolling bearings for wheel supports used in wheel supports for indicating wheels. [0003] It also relates to a one-way clutch built-in rotary transmission device in which the ...

Claims

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Application Information

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IPC IPC(8): C10M125/04C10M125/10C10M101/02C10M101/04C10M105/18C10M107/02C10M115/08C10M117/02F16C33/66F16D41/06C10N10/04C10N10/10C10N20/02C10N20/06C10N30/06C10N30/08C10N40/02C10N50/10
Inventor 三上英信川村隆之
Owner NTN CORP
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