Internal combustion engine with electric starting system

Patent metadata

Field	Value
Publication number	US-10539112-B2
Application number	US-201716097044-A
Country	US
Kind code	B2
Filing date	Apr 27, 2017
Priority date	Apr 28, 2016
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

An internal combustion engine includes an engine block, an electric motor, a worm coupled to and rotated by the electric motor, a worm gear coupled to and configured to be rotated by the worm, a crankshaft configured to rotate about a crankshaft axis, a flywheel including a flywheel cup having flywheel protrusions, a clutch driven by the worm gear and configured to engage the one or more flywheel protrusions such that the crankshaft is rotated, and an energy storage device electrically coupled to the electric motor. The clutch is configured to disengage from the flywheel protrusions when the rotational speed of the crankshaft exceeds the rotational speed of the worm gear. When the electric motor is activated, the electric motor rotates the worm rotating the worm gear, which causes the clutch to engage the flywheel protrusions, transferring worm gear rotation to the flywheel and the crankshaft to rotate the engine for starting.

First claim

What is claimed is:

1. An internal combustion engine, comprising:
an engine block;
a blower housing configured to direct cooling air to the engine block;
an electric starting system, comprising:
an electric motor;
a transmission; and
an energy storage device located within the blower housing, wherein the energy storage device is electrically coupled to the electric motor to power the electric motor;

a crankshaft configured to rotate about a crankshaft axis;
wherein when the electric starting system is activated, the electric starting system rotates the crankshaft to rotate the engine for starting.

2. The internal combustion engine of claim 1 ,
wherein the electric motor and the transmission are located within the blower housing;
wherein the electric motor is secured to an underside of the blower housing.

3. The internal combustion engine of claim 1 , further comprising:
a mounting frame;
wherein the electric motor and the transmission are coupled to the mounting frame;
wherein the blower housing is configured to be interchangeable with a second blower housing.

4. The internal combustion engine of claim 1 , further comprising:
a controller configured to control the electric motor to start at an initial rotational speed and increases the rotational speed over time.

5. The internal combustion engine of claim 1 , further comprising a mounting plate, wherein the energy storage device is fastened to the mounting plate.

6. The internal combustion engine of claim 5 , wherein the energy storage device is located between the blower housing and the mounting plate.

7. The internal combustion engine of claim 1 , wherein the energy storage device is fastened to an underside of the blower housing.

8. The internal combustion engine of claim 1 , wherein the internal combustion engine further includes a charging system to charge the energy storage device.

9. The internal combustion engine of claim 8 , wherein the charging system includes an alternator configured to produce electricity.

10. The internal combustion engine of claim 8 , wherein the charging system produces electricity by receiving waste electricity.

11. The internal combustion engine of claim 1 , wherein the electric motor turns off automatically in response to the engine reaching a threshold speed.

12. The internal combustion engine of claim 1 , wherein the electric motor turns off automatically in response to a user removing a start input.

13. The internal combustion engine of claim 1 , wherein the electric motor turns off automatically after a set period of cranking time.

Assignees

• Briggs & Stratton Corp

Inventors

• Meyer Mark
• Procknow David W

Classifications

• F02D2400/06

  Small engines with electronic control, e.g. for hand held tools · CPC title

• F02N15/02

  Gearing between starting-engines and started engines; Engagement or disengagement thereof · CPC title

• F02N11/0862

  characterised by the electrical power supply means, e.g. battery · CPC title

• F02B63/02

  for hand-held tools · CPC title

• F02N15/00

  Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00 · CPC title