US 9,309,959 B2 · Power transmission device

Abstract

A power transmission device having a shift device in a case; and a pump sucking and discharges oil, including: a gear receiving power from the shift device; a gear shaft with a breather chamber having at least one end side in an axial direction being opened, and attached to the gear; a bearing supporting the gear shaft rotatably relative to the case on the breather chamber one end side; a vent pipe communicating with the breather chamber opening and outside of the case; a passage in the case with an outlet port opening to the case inside, and allowing pump leakage oil to flow from the outlet port; a member receiving flowing from the outlet port of the passage; a passage guiding the leakage oil from the receiving member to the bearing; and a portion suppressing entry of oil thrown up with rotation of the gear into the receiving member.

Drawings

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Drawings

Claims6

Dependent claims

A power transmission device that comprises:

a shift device accommodated in a case;
and an oil pump that sucks and discharges hydraulic oil, comprising:
a gear to which power is transmitted from the shift device;
a gear shaft which has a breather chamber having at least one end side in an axial direction being opened, and to which the gear is attached;
a bearing that supports the gear shaft rotatably with respect to the case on the one end side of the breather chamber;
a vent pipe that communicates with the opening of the breather chamber and outside of the case;
a leakage oil passage that is formed in the case, that has an outlet port opening to inside of the case, and that allows leakage oil of the oil pump to flow out from the outlet port;
a receiving member that receives the leakage oil flowing out from the outlet port of the leakage oil passage;
a guide passage that guides the leakage oil received by the receiving member to the bearing;
and
an inflow suppressing portion that suppresses entry of thrown-up oil thrown up with rotation of the gear into the receiving member.

8 more elements

Dependencies are inferred from the claim text.

Description6,979 words

Summary1,842 words

#This application is a National Stage of International Application No. PCT/JP2012/071146, filed on Aug. 22, 2012, which claims priority from Japanese Patent Application No. 2011-214712, filed on Sep. 29, 2011, the contents of all of which are incorporated herein by reference in their entirety.

#The present invention relates to power transmission devices including a shift device that is accommodated in a case, and an oil pump that suctions and discharges hydraulic oil.

#Conventionally, as this type of power transmission devices, a power transmission device is known which has an oil pump that is disposed between a pump housing and a pump cover defining a first accommodating chamber accommodating a torque converter and a second accommodating chamber accommodating a planetary gear train of a transmission, and that supplies hydraulic oil to the torque converter and the transmission (see, e.g., Japanese Patent Application Publication No. 2007-85409 (JP 2007-85409 A)). In this power transmission device, a lubricating oil passage is formed in the pump housing, and a lubricating oil supply port extending through the pump cover is formed in the pump cover at a position matching the lubricating oil passage. A communication groove that allows the lubricating oil supply port to communicate with the clutch plate side of a brake that selectively holds rotating elements of the planetary gear train stationary is formed around the lubricating oil supply port. Thus, in this power transmission device, leakage oil that leaks through a gap around the pump housing when the oil pump discharges hydraulic oil flows into the lubricating oil passage, and is supplied as lubricating oil to the clutch plate through the lubricating oil passage, the lubricating oil supply port, and the communication groove.

Brief description of the drawings7 figures

#FIG. 1 is a schematic configuration view of a vehicle 10 having mounted thereon a power transmission device 20 according to an embodiment of the present invention;

#FIG. 2 is an enlarged perspective view showing a main part of the power transmission device 20;

#FIG. 3 is a partial sectional view showing a main part of the power transmission device 20;

Detailed description5,000 words

#A mode for carrying out the present invention will be described below based on an embodiment.

#FIG. 1 is a schematic configuration view of a vehicle 10 having mounted thereon a power transmission device 20 according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a main part of the power transmission device 20, and FIG. 3 is a partial sectional view showing a main part of the power transmission device 20. As shown in these figures, the power transmission device 20 is mounted on the front-wheel drive vehicle 10 to transmit power from an engine 12 to right and left driving wheels DW of the vehicle 10. The power transmission device 20 includes a hydraulic transmission device (starting device) 22, an oil pump 30 as an oil-pressure generating source, a stepped automatic transmission (shift device) 40, a gear mechanism 50 including a differential mechanism 45, a hydraulic control device 70 that regulates the pressure of hydraulic oil (ATF) from the oil pump 30 to supply the resultant hydraulic oil to the hydraulic transmission device 22 and the automatic transmission 40, a shifting electronic control unit, not shown, which controls the hydraulic control device 70 etc., a transmission case 21 (see FIGS. 2, 3, etc.) that accommodates these elements, etc.

#The hydraulic transmission device 22 is configured as a hydraulic torque converter with a lockup clutch. The hydraulic transmission device 22 includes a pump impeller 23 that is connected to a crankshaft 14 of the engine 12, via a front cover, a turbine runner 24 that is fixed to an input shaft 41 of the automatic transmission 40 via a turbine hub, a stator 25 that adjusts the flow of hydraulic oil (ATF) from the turbine runner 24 to the pump impeller 23, a lockup clutch 26 having a damper mechanism, not shown, etc.

Facts

Application

14/234,846Filed 22 Aug 2012

Priority

JP 2011-21471229 Sep 2011

Published

US 2014/0213405 A131 Jul 2014

Granted

12 Apr 2016

Term ends

11 Mar 2033

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 201 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification8 codes

F16H 57/043
Guidance of lubricant: within rotary parts, e.g. axial channels or radial openings in shafts
F16H 57/027
Gearboxes; Mounting gearing therein: characterised by means for venting gearboxes, e.g. air breathers
F16H 57/0423
On or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like: lubricant guiding means…
F16H 57/0471
Bearings or seals: bearing

Timeline

29 Sep 2011Priority claimedJP 2011-214712
22 Aug 2012Application filedUS 14/234,846
27 Jan 2014Assigned to Aisin Aw Co., Ltd.assignment of assignor's interest
31 Jul 2014PublishedUS 2014/0213405 A1
12 Apr 2016GrantedUS 9,309,959 B2
12 Oct 2026TodayWithin its term
11 Mar 2033Term endsEstimated, includes 201 days of adjustment

Power transmission device

Life of this patent

Power transmission device

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims6

Description6,979 words

Drawings

Classification8 codes

Life of this patent

Description6,979 words