POWER TRANSMISSION DEVICE

• US 20110061482A1
• Filed: 05/07/2009
• Published: 03/17/2011
• Est. Priority Date: 05/26/2008
• Status: Active Grant

• Current Assignee: Nippon Seiki Company Limited
• Original Assignee: Nippon Seiki Company Limited
• Inventors: Adachi, Yoshiko, Maruyama, Kazuya, Jinushi, Kouichi
• Granted Patent: US 8,864,325 B2
• Time in Patent Office: Days
• US Class Current: 74/89.23
• CPC Class Codes: B60K 2370/1529 Head-up displays
• CPC Class Codes: B60K 35/23 Head-up displays [HUD] optical aspects of head-up displays G02B27/01
• CPC Class Codes: F16H 25/2015 Means specially adapted for stopping actuators in the end position; Position sensing means
• CPC Class Codes: F16H 25/2021 with means for avoiding overloading
• CPC Class Codes: G02B 27/0149 characterised by mechanical features G02B27/0176 takes precedence
• CPC Class Codes: Y10T 74/18576 including screw and nut

Abstract

A power transmission device which is free from a possibility of breakage of a driving member is provided. A stepping motor (driving member) 61a configured to be driven on the basis of a command signal from a controller 70, a lead screw portion 61c configured to be rotationally driven in association with the drive of the stepping motor 61a, and a power transmitting member 65 configured to move along an axial direction X of the lead screw portion 61c in accordance with the rotation of the lead screw portion 61c and transmit a power to a power transmitted member 42e are provided, and the controller 70 is configured to control the output of the command signal to the stepping motor 61a to be stopped when the power transmitting member 65 is not moved along the axial direction X.

Claims

1. A power transmission device comprising:

a driving member configured to be driven on the basis of a command signal from a controller;

a lead screw portion configured to be rotationally driven in association with the drive of the driving member; and

a power transmitting member configured to move along an axial direction of the lead screw portion in accordance with the rotation of the lead screw portion to transmit the power to a power transmitted member,

characterized in that the controller is configured to control the output of the command signal to the driving member to be stopped when the power transmitting member is not moved along the axial direction.

2. The transmission device according to claim 1, comprising a moving member configured to be engaged with the lead screw portion and move along the axial direction in accordance with a thrust given by the rotation of the lead screw portion,

characterized in that the power transmitting member moves along the axial direction synchronously with the movement of the moving member.

3. The transmission device according to claim 1, characterized in that the power transmitting member is formed with an insertion portion configured to allow insertion of a guide shaft, which extends in substantially parallel to the lead screw portion.