Vehicle outside mirror device
It is important to eliminate or reduce dispersion in clutch torque of a clutch mechanism for each product to its required minimum. According to the present invention, a clutch member 25 that is manufactured separately from a gear member 33 of a clutch gear 32 is formed of a resin member. As a result, there is no need to apply a treatment of eliminating surface roughness or a surface hardening treatment in the clutch member 25 , and therefore, no dispersion occurs in surface roughness or surface hardening of a clutch protrusive portion 40 of the clutch member 25 that is made of a resin member, and the dispersion in clutch torque can be eliminated or can be reduced to its required minimum.
1. A vehicle outside mirror device of which a mirror assembly is rotatably mounted on a vehicle body via an electrically driven storage unit and a base,
the electrically driven storage unit comprising:
a shaft holder that is fixed to the base;
a shaft that is provided on the shaft holder;
a casing which is rotatably mounted on the shaft, and on which the mirror assembly is mounted;
a motor and a rotation force transmission mechanism which are housed in the casing, for electrically driving the mirror assembly to rotate relative to the shaft; and
a clutch mechanism which is provided in the rotation force transmission mechanism, which is unable to be disengaged with an electrically driven rotation force of the motor and the rotation force transmission mechanism, and is able to be disengaged with a force that is equal to or greater than the electrically driven rotation force to thereby enable the mirror assembly to rotate relative to the shaft,
the clutch mechanism comprising:
a clutch gear having a first clutch portion;
a clutch holder having a second clutch portion; and
a spring configured to connect the first and second clutch portions to each other so as to enable disconnection from each other,
wherein the clutch gear is made of a clutch member having the first clutch portion provided on one end face thereof and a gear member having a gear portion,
the gear member is formed in a cylindrical shape, the gear portion being provided on an outer circumferential face of the gear member,
the gear member is formed of a metal member and the clutch member is formed of a resin member in a cylindrical shape,
the cylindrical shape of the clutch member has such dimension that the clutch member elastically engages with the gear member through elastic action between the resin member and the metal member, the clutch member being inserted into the gear member such that an outer face of the clutch member is surrounded by the gear member, so that the clutch member and the gear member are fixedly mounted in a rotational direction.
2. The vehicle outside mirror device according to claim 1 , wherein the clutch holder is formed of a resin member.
3. The vehicle outside mirror device according to claim 1 , wherein
the clutch member and the gear member have a rotation stop portion configured to prevent mutual rotation around a rotational center of the shaft and a movement stop portion configured to prevent mutual movement in a direction of a rotational centerline of the shaft,
the clutch member is inserted into the gear member and elastically engaged with the gear member through elastic action between the resin member and the metal member at the rotation stop portion to disable rotation around the rotational center of the shaft by means of the rotation stop portion and to disable movement in the direction of the rotation centerline of the shaft by means of the movement stop portion, and
the clutch member and the gear member are integrally mounted.
4. The vehicle outside mirror device according to claim 1 , wherein,
a dimensional relationship between an outer diameter of the clutch member and an inner diameter of the gear member is a dimensional relationship capable of inserting the clutch member in the gear member.
5. The vehicle outside mirror device according to claim 1 , wherein,
a plurality of elastic jaw portions are integrally provided at equal intervals on the outer circumferential face of the clutch member, and
a slit is provided between the elastic jaw portions, the slit being adapted to enable the elastic jaw portion to easily slacken in a radial direction of the clutch member at a time of slackening.
6. A vehicle outside mirror device of which a mirror assembly is rotatably mounted on a vehicle body via an electrically driven storage unit and a base,
the electrically driven storage unit comprising:
a shaft holder that is fixed to the base;
a shaft that is provided on the shaft holder;
a casing which is rotatably mounted on the shaft, and on which the mirror assembly is mounted;
a motor and a rotation force transmission mechanism which are housed in the casing, for electrically driving the mirror assembly to rotate relative to the shaft; and
a clutch mechanism which is provided in the rotation force transmission mechanism, which is unable to be disengaged with an electrically driven rotation force of the motor and the rotation force transmission mechanism, and is able to be disengaged with a force that is equal to or greater than the electrically driven rotation force to thereby enable the mirror assembly to rotate relative to the shaft,
the clutch mechanism comprising:
a clutch gear having a first clutch portion;
a clutch holder having a second clutch portion; and
a spring configured to connect the first and second clutch portions to each other so as to enable disconnection from each other,
wherein the clutch gear is made of a clutch member having the first clutch portion provided on one end face thereof and a gear member having a gear portion,
the gear member is formed in a cylindrical shape, the gear portion being provided on an outer circumferential face of the gear member,
the gear member is formed of a metal member and the clutch member is formed of a resin member in a cylindrical shape,
the clutch member and the gear member each have a rotation stop portion configured to prevent mutual rotation around a rotational center of the shaft and a movement stop portion configured to prevent mutual movement in a direction of a rotational centerline of the shaft,
the cylindrical shape of the clutch member has such dimension that the clutch member is inserted into the gear member such that an outer face of the clutch member is surrounded by the gear member, the clutch member elastically engages with the gear member through elastic action between the resin member and the metal member, so that the clutch member and the gear member are fixedly mounted in a rotational direction,
the rotation stop portions of the clutch member and the gear member elastically engage with each other through elastic action between the resin member and the metal member to disable rotation around the rotational center of the shaft by means of the rotation stop portion and to disable movement in the direction of the rotation centerline of the shaft by means of the movement stop portion, and
the clutch member and the gear member are integrally mounted.