US 9,772,034 B2Granted

Power unit

AssigneeHonda Motor Co., Ltd.

InventorsAtsushi Chiba, Tensei Hayashi, Masazumi Naito

Life of this patent

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Abstract

A power unit having a crankcase and peripheral devices wherein a driving source for a gear shifting device is disposed so as to be displaced below the crankcase. An engine includes a gear speed change mechanism having a plurality of gear pairs for changing the speed of a rotational force of a crankshaft. A gear shifting device includes at least a plate-shaped shift arm rocking about a shift spindle to perform a gear pair changing operation on the gear speed change mechanism. A crankcase houses the gear speed change mechanism and the gear shifting device with an oil pan attached to a lower portion of the crankcase. A communicating hole communicating with the oil pan is formed in a bottom portion of the crankcase with the bottom portion being located below the shift arm, and a rocking range of the shift arm partly overlaps the communicating hole.

Claims10

Dependent claims

A power unit comprising:

an engine;
a gear speed change mechanism having a plurality of gear pairs to change a speed of rotation of a crankshaft;
a gear shifting device including at least a plate-shaped shift arm rocking about a shift spindle to perform a gear pair changing operation on the gear speed change mechanism;
a crankcase housing the gear speed change mechanism and the gear shifting device;
and
an oil pan attached to a lower portion of the crankcase, said oil pan including a projecting portion projecting rearwardly of a vehicle with the projecting portion including a slope portion that descends to a storage chamber of the oil pan;
and
a communicating hole formed in the lower portion of the crankcase for communicating with the oil pan, said communicating hole being formed above the projecting portion of the oil pan and being located below the shift arm wherein the shift arm partly enters the communicating hole formed above the projecting portion of the oil pan during rocking movement of the shift arm.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/663,002Filed 19 Mar 2015
Priority: JP 2014-06445426 Mar 2014
Published: US 2015/0276056 A11 Oct 2015
Granted: 26 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F16H 63/30
Final output mechanisms therefor; Actuating means for the final output mechanisms: constructional features of the final output mechanisms
F01M 11/0004
Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00: oilsumps
F16H 57/02
General details of gearing: gearboxes; Mounting gearing therein
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…