OIL PASSAGE STRUCTURE FOR POWER TRANSMISSION DEVICE

• US 20180106359A1
• Filed: 10/10/2017
• Published: 04/19/2018
• Est. Priority Date: 10/14/2016
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KAWAKAMI, Takaho, TABUCHI, Motoki
• Granted Patent: US 10,371,248 B2
• Time in Patent Office: Days
• CPC Class Codes: B29C 43/00 Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor by liberation of internal stresses B29C61/006
• CPC Class Codes: F16H 2057/02091 Measures for reducing weight of gearbox by using particular materials F16H57/032
• CPC Class Codes: F16H 2057/02095 Measures for reducing number of parts or components
• CPC Class Codes: F16H 2061/0037 characterised by controlled fluid supply to lubrication circuits of the gearing see also lubrication control F16H57/0446
• CPC Class Codes: F16H 48/08 comprising bevel gears
• CPC Class Codes: F16H 57/032 characterised by the materials used
• CPC Class Codes: F16H 57/04 Features relating to lubrication or cooling or heatingin hydrokinetic gearing F16H41/30; control of lubrication or cooling in hydrostatic gearing F16H61/4165
• 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 57/0445 for supply of different gearbox casings or sections
• CPC Class Codes: F16H 57/0446 the supply forming part of the transmission control unit, e.g. for automatic transmissions
• CPC Class Codes: F16H 57/0457 Splash lubrication characterised by the problem reducing losses, e.g. splash losses F16H57/0409
• CPC Class Codes: F16H 57/0471 Bearing
• CPC Class Codes: F16H 57/0483 Axle or inter-axle differentials

Abstract

In an oil passage structure for a power transmission device including a case provided to accommodate a power transmission device, a baffle plate attached to an inner wall of the case, and an oil pump, the oil passage structure includes a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate. A plate oil passage, which constitutes a portion of the supply oil passage, a supply port, which allows the oil discharged from the oil pump to flow into the plate oil passage through the supply port, and a first discharge port, which allows the oil supplied to the oil supply destination to be discharged through the first discharge port, are formed in the baffle plate.

Claims

1. An oil passage structure for a power transmission device, the oil passage structure comprising:

a case provided to accommodate the power transmission device;

a baffle plate attached to an inner wall of the case;

an oil pump; and

a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate, the baffle plate having a plate oil passage, a supply port and a discharge port, the plate oil passage being an oil passage that constitutes a portion of the supply oil passage, the supply port being configured to allow the oil discharged from the oil pump to flow into the plate oil passage through the supply port, and the discharge port being configured to allow the oil supplied to the oil supply destination, to be discharged from the plate oil passage through the discharge port.

2. The oil passage structure according to claim 1, wherein:

the oil supply destination includes a first oil supply destination and a second oil supply destination at different positions inside the case;

the discharge port includes a first discharge port that allows the oil supplied to the first oil supply destination to be discharged through the first discharge port, and a second discharge port that allows the oil supplied to the second oil supply destination to be discharged through the second discharge port; and

the plate oil passage branches to a second oil passage that leads from the supply port to the first discharge port, and a third oil passage that leads from the supply port to the second discharge port.

3. The oil passage structure according to claim 2, wherein:

the plate oil passage is an oil passage that allows the oil to be supplied through the oil passage to a lubrication-needing portion where lubrication by the oil is needed in the power transmission device;

the first oil supply destination is a constituent element of a differential gear mechanism included in the power transmission device;

the second oil supply destination is a constituent element separate from the differential gear mechanism in the power transmission device;

the first discharge port is provided at a position where oil is directly supplied to the first supply destination; and

the second discharge port is provided at a position where oil is directly supplied to the second supply destination.

4. The oil passage structure according to claim 3, wherein:

the oil supply destination further includes a third oil supply destination that is a differential pinion gear and a differential side gear that constitute the differential gear mechanism;

the discharge port further includes a third discharge port provided at a position where oil is directly supplied to the third oil supply destination;

the plate oil passage branches to a second oil passage that leads from the supply port to the first discharge port, and a fourth oil passage that leads from the supply port to the third discharge port;

the first supplied oil portion is a differential bearing that supports a differential case accommodating the differential pinion gear and the differential side gear on the case; and

the baffle plate is disposed so as to cover the differential case.

5. The oil passage structure according to claim 2, wherein:

the plate oil passage is a lubricating oil passage that allows oil to be supplied through the lubricating oil passage to a constituent element of a differential gear mechanism included in the power transmission device, and an oil passage that allows hydraulic pressure of oil to be supplied through the oil passage to a hydraulic actuator included in the power transmission device;

the baffle plate is provided on an axis where the differential gear mechanism is disposed;

the first oil supply destination is a constituent element of the differential gear mechanism;

the second oil supply destination is the hydraulic actuator; and

the first discharge port is provided at a position where oil is directly supplied to the first supply destination.

6. The oil passage structure according to claim 2, wherein a direction in which the supply port opens is a direction opposite to a direction in which the first discharge port opens.

7. The oil passage structure according to claim 5, wherein a direction in which the supply port opens is the same as a direction in which the second discharge port opens.

8. The oil passage structure according to claim 1, wherein the plate oil passage is an oil passage that passes through an inside of the baffle plate.

9. The oil passage structure according to claim 1, wherein the baffle plate has a second plate oil passage that is an oil passage independent from the plate oil passage, the second plate oil passage is configured to allow oil to be pumped through the second plate oil passage to an oil supply destination different from the oil supply destination via the plate oil passage.

10. The oil passage structure according to claim 1, wherein:

the baffle plate includes a plate-shaped plate body and a tubular member integrated with the plate body; and

the plate oil passage is an oil passage formed by the tubular member.

11. The oil passage structure according to claim 1, wherein:

the power transmission device includes a transmission, a counter gear mechanism, and a differential gear mechanism;

the oil pump is a mechanical oil pump which is driven by engine torque transmitted to the mechanical oil pump via the power transmission device; and

the plate oil passage is provided so as to pass between a rotary shaft of the transmission and a rotary shaft of the differential gear mechanism.

12. The oil passage structure according to claim 1, wherein:

the power transmission device includes a transmission, a counter gear mechanism, and a differential gear mechanism; and

the plate oil passage is provided so as to pass between a rotary shaft of the counter gear mechanism and a rotary shaft of the differential gear mechanism.

13. The oil passage structure according to claim 1, wherein:

the baffle plate has a tubular part, and a flange part that extends radially outwardly from the tubular part;

the plate oil passage extends in a circumferential direction of the baffle plate; and

the discharge port is provided at a position, which is different in the circumferential direction of the baffle plate from a position at which the supply port is provided, such that oil is supplied to the oil supply destination.