Power unit

Patent metadata

Field	Value
Publication number	US-9772034-B2
Application number	US-201514663002-A
Country	US
Kind code	B2
Filing date	Mar 19, 2015
Priority date	Mar 26, 2014
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

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.

First claim

What is claimed is:

1. 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.

2. The power unit according to claim 1 , further comprising:
a shift actuator transmitting a driving force to the shift spindle;
wherein the shift actuator is fastened and fixed to a crankcase cover covering a side of the crankcase, and is disposed in a rear of the oil pan.

3. The power unit according to claim 2 , wherein a clamp member fixing a harness of the shift actuator is jointly fastened to an oil pan fastening portion in a vicinity of the projecting portion.

4. The power unit according to claim 1 , further comprising:
a plate-shaped baffle plate covering a ceiling surface of the oil pan;
an opening formed in the plate-shaped baffle plate wherein said opening is in communication with the communicating hole formed in the lower portion of the crankcase.

5. The power unit according to claim 1 , wherein a main shaft of the gear speed change mechanism is located below a counter shaft; and
the gear shifting device is disposed to a rear of the power unit relative to a line connecting axes of the main shaft and the counter shaft.

6. The power unit according to claim 1 , wherein an oil amount checking device is attached to a clutch cover, and a gage portion of the oil amount checking device is inserted into the communicating hole.

7. The power unit according to claim 6 , wherein the shift actuator transmits a driving force to one end portion of the shift spindle via a power transmitting mechanism, a shift spindle sensor is coupled to another end portion of the shift spindle, and the shift spindle sensor is fastened and fixed to the clutch cover covering one end side of the crankcase.

8. A power unit comprising:
a gear speed change mechanism having a plurality of gear pairs;
a gear shifting device including at least a plate-shaped shift arm rocking about a shift spindle for performing a gear pair changing operation on the gear speed change mechanism;
a crankcase housing the gear speed change mechanism and the gear shifting device;
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 being formed in a lower portion of the crankcase, said communicating hole being formed above the projecting portion of the oil pan and being in communication with the oil pan with the communicating hole 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.

9. The power unit according to claim 8 , further comprising:
a shift actuator transmitting a driving force to the shift spindle;
wherein the shift actuator is fastened and fixed to a crankcase cover covering a side of the crankcase, and is disposed in a rear of the oil pan.

10. The power unit according to claim 8 , further comprising:
a plate-shaped baffle plate covering a ceiling surface of the oil pan;
an opening formed in the plate-shaped baffle plate wherein said opening is in communication with the communicating hole formed in the lower portion of the crankcase.

Assignees

• Honda Motor Co Ltd

Inventors

• Chiba Atsushi
• Hayashi Tensei
• Naito Masazumi

Classifications

• F16H63/14

  the final output mechanisms being successively actuated by repeated movement of the final actuating mechanism · CPC title

• F16H57/0423

  Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes · CPC title

• F16H57/02

  Gearboxes; Mounting gearing therein · CPC title

• F01M2011/0058

  Fastening to the transmission · CPC title

• F16H63/30 Primary

  Constructional features of the final output mechanisms · CPC title