COOLING SYSTEM FOR POWER TRANSMISSION UNIT

• US 20170097086A1
• Filed: 09/22/2016
• Published: 04/06/2017
• Est. Priority Date: 10/02/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: ONO, Tomohito, HASHIMOTO, Hiroto, KIMURA, Hiroaki
• Granted Patent: US 10,458,533 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/405 Housings
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2306/03 Lubrication
• CPC Class Codes: B60Y 2306/05 Cooling
• CPC Class Codes: B60Y 2400/73 Planetary gearings
• CPC Class Codes: F16H 3/727 with at least two dynamo electric machines for creating an electric power path inside the gearing, e.g. using generator and motor for a variable power torque path special adapted for a hybrid electric vehicle B60K6/20
• CPC Class Codes: F16H 37/0806 with a plurality of driving or driven shafts
• CPC Class Codes: F16H 57/0412 Cooling or heating; Control of temperature
• CPC Class Codes: F16H 57/0417 Heat exchangers adapted or integrated in the gearing
• CPC Class Codes: F16H 57/0423 Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes means for guiding lubricant into an axial channel of a shaft F16H57/0426; lubrication by injection, injection nozzles or tubes therefore F16H57/0456
• CPC Class Codes: F16H 57/0453 Section walls to divide a gear sump
• CPC Class Codes: F16H 57/0457 Splash lubrication characterised by the problem reducing losses, e.g. splash losses F16H57/0409
• CPC Class Codes: F16H 57/0476 Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
• CPC Class Codes: F16H 57/0484 with variable gear ratio or for reversing rotary motion
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/91 Orbital, e.g. planetary gears
• CPC Class Codes: Y10S 903/952 Housing details

Abstract

A cooling system for a power transmission unit that can cool a cooling site effectively is provided. The cooling system comprises: an oil pump; an oil cooler that cools the oil delivered from the oil pump; a first oil pipe for delivering the oil from the oil pump to the oil cooler; a second oil pipe for delivering the oil cooled by the oil cooler to a heat generating element. A housing chamber includes a high-temperature section where the heat generating element is arranged, and a low-temperature section. The second oil pipe is arranged in the housing chamber while passing through the low-temperature section, and an opening is formed on the second oil pipe in such a manner as to open toward the heat generating element.

Claims

1. A cooling system for a power transmission unit, comprising:

an oil pump that pumps up oil in an oil pan and that discharges the oil therefrom;

an oil cooler that cools the oil delivered from the oil pump;

a first oil pipe for delivering the oil from the oil pump to the oil cooler;

a second oil pipe for delivering the oil cooled by the oil cooler to a heat generating element; and

a housing chamber including a high-temperature section where the heat generating element is arranged, and a low-temperature section where a temperature is lower than that in the high-temperature section;

wherein the second oil pipe is arranged in the housing chamber while passing through the low-temperature section, and

wherein an opening is formed on the second oil pipe in such a manner as to open toward the heat generating element.

2. The cooling system for a power transmission unit as claimed in claim 1, wherein the first oil pipe is arranged in the housing chamber while passing through the high-temperature section.

3. The cooling system for a power transmission unit as claimed in claim 1, further comprising:

a reservoir that is arranged in at least any one of the high-temperature section and the low-temperature section to hold the oil splashed in the housing chamber; and

a fixing member that fix the first oil pipe to an inner face of the housing chamber above the reservoir in the high-temperature section, or that fix the second oil pipe to the inner face of the housing chamber above the reservoir in the low-temperature section.

4. The cooling system for a power transmission unit as claimed in claim 3, wherein the fixing member comprises a guide portion that protrudes downwardly toward the reservoir.