| 摘要 |
A meter unit includes a step motor, a gear, a braking spring and a case. The gear has a gear body and a rotation shaft. The braking spring urges the gear in a direction of an axis of rotation of the gear. The case accommodates the step motor, the gear body, a part of the rotation shaft, and the braking spring therein. The braking spring has a shape through which the first part of the rotation shaft passes. A first face of the gear body is formed with a recessed portion which accommodates the braking spring. A first part of the case supports a second face of the gear body. A second part of the case is configured to press the braking spring so that entire part of the braking spring is accommodated in the recessed portion. |
| 主权项 |
1. A meter unit, comprising:
a step motor; a gear having:
a gear body, configured to be rotated by a torque transmitted from the step motor, and having a first face and a second face opposite to the first face; anda rotation shaft including a first part extended from the first face and a second part extended from the second face; a braking spring configured to urge the gear in a direction of an axis of rotation of the gear; and a case accommodating the step motor, the gear body, a part of the rotation shaft, and the braking spring therein, wherein the braking spring has a shape through which the first part of the rotation shaft passes, the first face is formed with a recessed portion which accommodates the braking spring, a first part of the case supports the second face of the gear body, and a second part of the case is configured to press the braking spring so that a height of the braking spring is smaller than a depth of the recessed portion, the braking spring has an annular shape having a hole through which the rotation shaft passes, the second part of the case protrudes from an inner face of the case to the braking spring and comes in contact with the braking spring at an end part thereof, and a portion of the second part of the case protrudes into the recessed portion of the first face of the gear body, wherein a portion of the second part of the case and the braking sprit are recessed in the recessed portion. |
