# US 2014/0360299 A1 · Rotation speed measuring device

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- Number: US 2014/0360299 A1
- Document ID: US20140360299A1
- Status: Published application
- Kind: A1
- Application number: 14/060,624
- Filed: 2013-10-23
- Published: 2014-12-11
- Earliest claimed: 2013-06-05
- Assignees: Hon Hai Precision Industry Co., Ltd.; Fu Tai Hua Industry (Shenzhen) Co., Ltd.
- Applicants: Hon Hai Precision Industry Co., Ltd.; Fu Tai Hua Industry (Shenzhen) Co., Ltd.
- Inventors: QI-LONG YU
- Web page: https://patentgrep.com/patent/US20140360299A1

## CPC

- G01P 3/46: by measuring amplitude of generated current or voltage {(in general G01R19/00)}
- F16H 1/125: {comprising spiral gears only}
- Y10T 74/19642: Directly cooperating gears
- Y10T 74/19688: Bevel
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- F16H: GEARING
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotation speed measuring device for measuring a rotation speed of a shaft includes an acceleration sensor, a fits gear, and a second gear. The first gear is fixed to the shaft and rotatable about an axis that the shaft rotates about. The second gear engages with the first gear and is rotatable about a vertical axis. The second gear has a support surface that is perpendicular to the vertical axis. The acceleration sensor is arranged on the support surface and has an acceleration sensing axis that is perpendicular to and coplanar with the vertical axis.

## Claims

### Claim 1

A rotation speed measuring device for measuring a rotation speed of a shaft, the rotation speed measuring device comprising:
an acceleration sensor;
a first gear to be fixed to the shaft and rotatable about an axis about which the shaft rotates; and
a second gear engaged with the first gear and being rotatable about a vertical axis, the second gear comprising a support surface that is perpendicular to the vertical axis;
wherein the acceleration sensor is arranged on the support surface and comprises an acceleration sensing axis that is perpendicular to and coplanar with the vertical axis.

### Claim 2 (depends on 1)

The rotation speed measuring device according to claim 1, wherein the first gear and the second gear are helical gears.

### Claim 3 (depends on 1)

The rotation speed measuring device according to claim 1, wherein the first gear and the second gear are bevel gears.

### Claim 4 (depends on 1)

The rotation speed measuring device according to claim 1, wherein the acceleration sensor is a single axis accelerometer.