# US 9,435,421 B2 · Baffle plate and transmission provided with the same

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- Number: US 9,435,421 B2
- Document ID: US9435421B2
- Status: Granted
- Kind: B2
- Application number: 14/416,350
- Filed: 2013-07-10
- Published: 2015-07-23
- Granted: 2016-09-06
- Earliest claimed: 2012-07-24
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Shota Mafune; Shuji Ueda
- Web page: https://patentgrep.com/patent/US9435421B2

## CPC

- F16H 57/0409: {characterised by increasing efficiency, e.g. by reducing splash losses}
- F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes}
- F16H 57/0427: {on rotary parts, e.g. using baffles for collecting lubricant by centrifugal force}
- F16H 57/0445: {for supply of different gearbox casings or sections}
- F16H 57/0457: {Splash lubrication}
- F16H 57/0483: {Axle or inter-axle differentials}
- F16H: GEARING

## Abstract

A baffle plate provided with a body section arranged to separate between a differential gear and an oil sump section, a first drain section for leading oil scooped up by the differential gear in a machine room to a control room, a notch section for defining a communicating passage between the inside surface of the casing and itself for letting oil flow from the control room to the machine room, a through-hole formed on a peripheral side of an opening of the body section and a second drain section for guiding oil scooped up by the differential gear and having passed via the through-hole to a shaft support of the differential gear.

## Claims

### Claim 1

A baffle plate in a transmission, the transmission comprising a machine room defined in a casing and accommodating a plurality of gears including a differential gear, a control room accommodating a mechanism for hydraulic pressure control arranged adjacent to the machine room in a casing and an oil sump section formed in the machine room between an inside surface of the casing and a side surface of the differential gear, the baffle plate arranged to separate between the differential gear and the oil sump section, the baffle plate comprising:
a body section arranged on the side of the differential gear and having at a center thereof an opening into which a rotation shaft of the differential gear is penetrated;
a first drain section formed on a surface of the oil sump section side of the body section for leading oil scooped up in the machine room by the differential gear to the control room;
a peripheral rib formed on part of a periphery of the body section;
a notch section disposed on the peripheral rib and forming, between the inside surface of the casing and itself, a communicating passage for letting oil flow from the control room to the machine room;
a slit-shaped through-hole formed on a peripheral side of the opening of the body section; and
a second drain section formed under the through-hole on the surface of the oil sump section side of the body section and guiding oil scooped up by the differential gear and having passed via the through-hole to a shaft support of the differential gear.

### Claim 2 (depends on 1)

The baffle plate according to claim 1, wherein the first drain section is a plate-shaped projecting piece gradually slanting downward to an upper part of the control room from an upper part of the machine room.

### Claim 3 (depends on 2)

The baffle plate according to claim 2, wherein under the through-hole on the surface of the body section on the differential gear side, a hollow section which is a surface on the differential gear side hollowed toward a back side in an axial direction and continued to the through-hole is disposed.

### Claim 4 (depends on 1)

The baffle plate according to claim 1, wherein under the through-hole on the surface of the body section on the differential gear side, a hollow section which is a surface on the differential gear side hollowed toward a back side in an axial direction and continued to the through-hole is disposed.