Seat belt retractor and seat belt device
First Claim
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1. A seat belt retractor comprising:
- a spool for retracting and withdrawing a seat belt;
an electric motor;
a power transmission mechanism that is interposed between the electric motor and the spool, wherein the power transmission mechanism is configured to form a connected state in which the electric motor and the spool are connected to each other and a disconnected state in which the connected state is released; and
a control unit for controlling the electric motor and the power transmission mechanism, wherein the spool is configured to be controlled to rotate in a seat belt retracting direction so as to retract the seat belt in the connected state of the power transmission mechanism when the electric motor is driven to be rotated in a first direction, and wherein the control unit is configured to control the electric motor so that the electric motor is rotated in a second direction at an operational sound reducing speed when the power transmission mechanism is switched from the connected state to the disconnected state.
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Abstract
The disclosed seat belt retractor can be used in reducing the operational sound caused by the disconnecting operation of the power transmission mechanism when the power transmission mechanism is switched from a connected state to a disconnected state. The power transmission mechanism can be switched from a connected state to a disconnected state by a rotational speed difference between an electric motor and a spool so as to release the connection between the electric motor and the spool. The motor 6 can be controlled to be rotated at an operational sound reducing speed when the power transmission mechanism 8 is switched from the connected state to the disconnected state.
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Citations
13 Claims
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1. A seat belt retractor comprising:
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a spool for retracting and withdrawing a seat belt;
an electric motor;
a power transmission mechanism that is interposed between the electric motor and the spool, wherein the power transmission mechanism is configured to form a connected state in which the electric motor and the spool are connected to each other and a disconnected state in which the connected state is released; and
a control unit for controlling the electric motor and the power transmission mechanism, wherein the spool is configured to be controlled to rotate in a seat belt retracting direction so as to retract the seat belt in the connected state of the power transmission mechanism when the electric motor is driven to be rotated in a first direction, and wherein the control unit is configured to control the electric motor so that the electric motor is rotated in a second direction at an operational sound reducing speed when the power transmission mechanism is switched from the connected state to the disconnected state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A seat belt device comprising:
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a seat belt for fastening about a vehicle occupant; and
a seat belt retractor, wherein the seat belt retractor comprises;
a spool for retracting and withdrawing a seat belt;
an electric motor;
a power transmission mechanism that is interposed between the electric motor and the spool, wherein the power transmission mechanism is configured to form a connected state in which the electric motor and the spool are connected to each other and a disconnected state in which the connected state is released; and
a control unit for controlling the electric motor and the power transmission mechanism, wherein the spool is configured to be controlled to rotate in a seat belt retracting direction so as to retract the seat belt in the connected state of the power transmission mechanism when the electric motor is driven to be rotated in a first direction, and wherein the control unit is configured to control the electric motor so that the electric motor is rotated in a second direction at an operational sound reducing speed when the power transmission mechanism is switched from the connected state to the disconnected state. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A seat belt retractor comprising:
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a spool for retracting and withdrawing a seat belt;
an electric motor;
a power transmission mechanism in operational contact with the electric motor and the spool, wherein the power transmission mechanism is configured to form a connected state in which the electric motor and the spool are connected to each other and a disconnected state; and
a control unit for controlling the electric motor and the power transmission mechanism, wherein the control unit is configured to control the electric motor so that the electric motor is rotated in a direction at an operational sound reducing speed when the power transmission mechanism is switched from the connected state to the disconnected state.
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Specification