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Overflow tube

An overflow pipe and working oil technology, which is applied in the field of overflow pipes, can solve the problems of poor operability of oil replacement, difficulty in preventing oil outflow, oil introduction conditions, oil fluctuation instability, etc.

Inactive Publication Date: 2006-09-13
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil level set in this way is unstable due to oil introduction conditions, oil fluctuations, etc., and introduction errors will occur
In addition, it also causes the tube to be difficult to stop the oil from flowing out of the tube, and one cannot be sure when to close the tube with the oil drain plug, resulting in poor operability of changing the oil

Method used

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  • Overflow tube
  • Overflow tube
  • Overflow tube

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0033] Referring to FIG. 1 , an automatic transmission 10 has a case formed of a transmission case 11 opened toward a vertically downward direction and an oil pan 12 in the form of a disc mounted to the transmission case 11 to close the open position. Gears, shafts, bearings, etc. are housed in the transmission case 11, and the transmission force output from the engine is output to the drive shaft.

[0034] The housing of the automatic transmission 10 has a prescribed amount of working oil sealed therein, and the oil pan 12 receives the working oil. The working oil functions as lubricating oil, known as automatic transmission fluid (ATF), for allowing operation of shift clutches and transmission of torque converter force, preventing gears and other similar mechanism parts from seizing. The oil pan 12 has a bottom 12m with a mechanism for controlling the working oil on the liquid level at the position indicated by the circle II.

[0035] 1 and 2, the bottom 12m of the oil pan ...

no. 2 example

[0049] In this embodiment, the description of the arrangement consistent with the overflow pipe 21 in the first embodiment will not be repeated.

[0050] refer to Figure 6 , the overflow pipe 46 has the cylindrical portion 26 and the end portion 47 formed at one end of the cylindrical portion 26 . The end portion 47 is directly adjacent to the cylindrical portion 26 and extends cylindrically from the cylindrical portion 26 along the central axis 101 . The end portion 47 has an inclined surface 47a at its extended end. The inclined surface 47 a vertically faces upward and extends annularly to surround the opening of the oil discharge hole 22 .

[0051] The inclined surface 47 a has an outer peripheral edge 47 p directly adjacent to the outer wall 28 and farther from the central axis 101 , and an inner peripheral edge 47 q directly adjacent to the inner wall 27 and closer to the central axis 101 . The inclined surface 47a is formed to extend vertically downward when viewed f...

no. 3 example

[0056] In this embodiment, the description of the arrangement consistent with the overflow pipe 21 in the first embodiment will not be repeated.

[0057] refer to Figure 7 , the overflow pipe 51 has a cylindrical portion 26 and an end portion 52 formed at one end of the cylindrical portion 26 . The end portion 52 is directly adjacent to the cylindrical portion 26 and extends cylindrically from the cylindrical portion 26 along the central axis 101 . The end portion 52 has an uneven surface 52a at the extended end thereof. The uneven surface 52 a vertically faces upward and extends annularly to surround the opening of the oil discharge hole 22 .

[0058] The uneven surfaces 52 a are respectively formed by surfaces of protrusions 53 and recesses 54 arranged alternately in the circumferential direction around the central axis 101 . The protrusion 53 and the recess 54 are formed to have a top surface 53 a and a bottom surface 54 a respectively so as to have steps in the directi...

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PUM

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Abstract

An overflow tube is provided at an oil pan and when the oil pan receives an amount of a working fluid exceeding a prescribed amount the overflow tube causes the fluid to overflow to allow the fluid to have a level set at a prescribed level. The overflow tube has an end portion positioned in the oil pan and defining an opening of a drain hole receiving and passing the fluid overflowing. The end portion has a curved surface facing vertically upward and extending to surround the opening of the drain hole, and curving in a direction in contact with a generally horizontal direction. The overflow tube can thus help to set the fluid's level at a prescribed level precisely.

Description

[0001] This non-provisional application is based on Japanese Patent Application No. 2005-062770 filed with the Japan Patent Office on March 7, 2005, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates generally to an overflow tube, and more particularly, to an overflow tube for controlling the oil level (oil level) in a housing. Background technique [0003] As for the conventional oil level control mechanism, for example, Japanese Patent Laid-Open No. Hei 10-213210 discloses an automatic transmission intended to enhance the operability of storing a prescribed amount of working oil. The disclosed automatic transmission is provided with an oil introduction port for introducing working oil into the oil chamber and an oil regulating port for allowing the working oil to overflow the oil chamber. Thereby, hydraulic oil can be replenished at the same time that the hydraulic oil overflows, allowing people to conf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H57/04F01M11/12
CPCF16H57/0452F16H57/0449F16H57/0408
Inventor 中村和明木村弘道渡辺和之宫崎光史草本大辅
Owner TOYOTA JIDOSHA KK