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Transmission fluid compositions for automobiles

a technology of transmission fluid and automobile, which is applied in the direction of additives, petroleum industry, lubricant compositions, etc., can solve the problems of poor friction coefficient between belt and pulley, and it is difficult to mount a metal belt-type continuously variable transmission in an automobile equipped with a 2000 cc or more displacement engin

Inactive Publication Date: 2004-10-14
NIPPON OIL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0032] The content of Component (A) in the transmission fluid composition for automobiles of the present invention is 0.001 percent by mass or more and preferably 0.003 percent by mass or more in terms of boron, based on the total mass of the composition. The content of Component (A) is 0.3 percent by mass or less, preferably 0.1 percent by mass or less, and particularly preferably 0.05 percent by mass or less. Component (A) of less than 0.001 percent by mass would fail to obtain a large torque transmission capacity, while Component (A) of more than 0.3 percent by mass would fail to achieve advantageous effects as expected with the amount.

Problems solved by technology

However, when an ATF is used as a lubricating oil for a metal belt-type continuously variable transmission, it is excellent in capabilities as a hydraulic oil and in functional capabilities of controlling the friction characteristics of the wet clutch but is poor in providing sufficient friction coefficient between the belt and the pulleys.
Therefore, so far, it has been found difficult to mount a metal belt-type continuously variable transmission in an automobile equipped with a 2000 cc or more displacement engine.

Method used

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  • Transmission fluid compositions for automobiles
  • Transmission fluid compositions for automobiles
  • Transmission fluid compositions for automobiles

Examples

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Embodiment Construction

1 TO 7 AND COMPARATIVE EXAMPLES 1 TO 10

[0170] Transmission fluid compositions for automobiles of the present invention (Examples 1 to 7) and those for comparison (Comparative Examples 1 to 10) were prepared using a hydrogenated refined mineral oil as a base oil in accordance with the formulations shown in Tables 1 and 2, respectively.

[0171] LFW-1 friction test was conducted for each of the compositions in accordance with the test conditions prescribed in ASTM D2714 to measure the frictional force at each slipping velocities thereby determining the friction coefficient.

[0172] (Test Conditions)

[0173] Ring: Falex S-10 Test Ring

[0174] (SAE 4620 Steel)

[0175] Block: Falex H-60 Test Block

[0176] (SAE 01 Steel)

[0177] Test oil temperature: 110.degree. C.

[0178] Test load: 250 lb

[0179] Slipping velocity: 25 cm / s

1 TABLE 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Lubricating base oil.sup.1) mass % 99.00 89.40 89.40 89.40 89.40 88.90 89.19 (A) Oil-soluble metal salt A....

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PUM

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Abstract

A transmission fluid composition for automobiles comprises a lubricating base oil, (A) an oil-soluble metal salt overbased with a specific alkaline earth metal borate, and (B) a sulfur-containing extreme pressure additive. The transmission fluid can enhance a metallic friction coefficient, leading to the achievement of improved transmission torque.

Description

[0001] The present invention relates to transmission fluid compositions for automobiles and more specifically to those which can be used advantageously for automatic transmissions, particularly for metal belt-type continuously variable transmissions.[0002] Recently, metal belt-type continuously variable transmissions have been spotlighted as automobile transmission because their energy loss by shifting is small. The transmissions of this type have a mechanism which transmits torque by friction between a metal belt and a pair of metal pulleys looped therearound and conducts gear shift by changing the radius ratio of the pulleys. Therefore, it is extremely important that a lubricating oil used for such metal belt-type continuously variable transmissions has capabilities of increasing the friction coefficient between the metal belt and the pulleys. Furthermore, such a lubricating oil is also required to have capabilities as a lubricating oil for gears taking out torque and bearings sup...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10M135/06C10M135/18C10M135/32C10M135/36C10M137/02C10M137/10C10M159/20C10M159/22C10M159/24C10M163/00C10N10/04C10N30/02C10N30/04C10N30/06C10N30/10C10N40/04
CPCC10M2203/1006C10M2207/026C10M2207/262C10M2207/289C10M2209/084C10M2215/064C10M2215/28C10M2219/00C10M2219/046C10M2219/066C10M2219/104C10M2219/106C10M2223/02C10M2223/04C10M2223/047C10M2227/09C10N2210/02C10N2230/02C10N2230/04C10N2230/06C10N2230/10C10N2230/42C10N2230/43C10N2240/04C10N2240/045C10N2260/14C10M159/20C10M163/00C10N2010/04C10N2030/02C10N2030/04C10N2030/06C10N2030/10C10N2040/04C10N2060/14C10N2030/42C10N2030/43C10N2040/045
Inventor TAKAHASHI, MASATO
Owner NIPPON OIL CORP
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