US 10,309,524 B2Granted

Lubricating device of power transmission device for vehicle

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsHiroaki Kiyokami, Yoshinori Morita, Shingo Kato, Yukinobu Nishikawa, Tetsuo Hori, Hakuba Okuno

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Abstract

During the travel of a vehicle, the oil level of lubricating oil is lowered due to the suction by at least a first oil pump and the scraping-up by the rotation of a differential ring gear and so on. In particular, until the oil level becomes equal to or lower than an upper end of a first partition wall, the oil level is lowered due to both the suction by the first oil pump and the scraping-up by the rotation of the differential ring gear and so on, and therefore, a region, that is immersed in the lubricating oil, of the differential device rapidly becomes smaller. Since a suction port of the first oil pump is disposed in a second oil storage portion, the oil level in the second oil storage portion during the travel of the vehicle can be adjusted independently of that in a first oil storage portion.

A lubricating device of a power transmission device for a vehicle, the lubricating device comprising:

an oil storage portion provided at a bottom portion in a case of the power transmission device configured to transmit a driving force from a driving force source of the vehicle to a drive wheel of the vehicle, the oil storage portion being configured to store lubricating oil, and the oil storage portion including a first oil storage portion and an oil storage portion other than the first oil storage portion defined by a first partition wall, the first oil storage portion being located below an output portion of the power transmission device;
and
a suction device configured to suck the lubricating oil and to supply the lubricating oil to respective portions of the power transmission device, the suction device including a first oil pump configured to be rotationally driven mechanically by rotation of the output portion and to suck the lubricating oil,
wherein
(i) a height of the first partition wall is set to be lower than a stationary oil level of the lubricating oil in a stationary state in which flow of the lubricating oil is stopped,
(ii) a height position of a lower end of the output portion is lower than an upper end position of the first partition wall, and the output portion is at least partially immersed in the lubricating oil in the stationary state,
(iii) a suction port of the first oil pump is disposed in the oil storage portion other than the first oil storage portion in the oil storage portion, and
(iv) during travel of the vehicle, an oil level in the first oil storage portion is caused to be located below the upper end position of the first partition wall, by a fact that the lubricating oil in the first oil storage portion is scraped up by the rotation of the output portion, and the lubricating oil in the oil storage portion other than the first oil storage portion is sucked by the first oil pump.

5 more elements

Facts

Application

15/412,940Filed 23 Jan 2017

Priority

JP 2016-0193333 Feb 2016

Published

US 2017/0219085 A13 Aug 2017

Granted

4 Jun 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification18 codes

F16H 57/0475
Elements of gearings to be lubricated, cooled or heated: engine and gearing, i.e. joint lubrication or cooling or heating thereof
B60K 6/445
Series-parallel type: differential gearing distribution type
B60R 17/02
Arrangements or adaptations of lubricating systems or devices: systems, e.g. central lubrication systems
F01M 1/02
Pressure lubrication: using lubricating pumps

Abstract

Claims4