Vehicle damper
A vehicle damper includes: a movable member that moves with linear motion according to a load applied from a wheel; a conversion member that converts the linear motion of the movable member into rotational motion; an electric motor having a rotor that rotates in conjunction with the rotational motion; a motor housing that houses the electric motor; and a damper mount housing that is fixed to a vehicle body and connected to the motor housing via a first elastic member. The vehicle damper dampens the linear motion of the movable member by an electromagnetic force of the electric motor. The vehicle damper has a second elastic member that is provided for at least one of the motor housing or the damper mount housing and abuts on the other of the motor housing or the damper mount housing when the motor housing and the damper mount housing approach each other.
1 . A vehicle damper, comprising:
a movable member that moves with linear motion according to a load applied from a wheel;
a conversion member that converts the linear motion of the movable member into rotational motion;
an electric motor having a rotor that rotates in conjunction with the rotational motion converted by the conversion member;
a motor housing that houses the electric motor; and
a damper mount housing that is fixed to a vehicle body and connected to the motor housing via a first elastic member, wherein
the conversion member is constituted of a ball screw and a ball screw nut, the ball screw being provided in the movable member, the ball screw nut being threadedly engaged with the ball screw,
the vehicle damper dampens the linear motion of the movable member by an electromagnetic force of the electric motor,
the movable member comprises
an outer cylinder including a connecting part that has one end to be connected to the wheel,
a first inner cylinder housed in the outer cylinder and extending in an axial direction of the outer cylinder, and
a second inner cylinder housed in the outer cylinder, housing herein the first inner cylinder, and having one end connected to the motor housing,
the motor housing has an impact-absorbing member attached to an edge of one end of the motor housing, the impact-absorbing member surrounding an outer periphery of the second inner cylinder and facing one end of the outer cylinder, and
the vehicle damper has a second elastic member that is provided for at least one of the motor housing or the damper mount housing and abuts on the other of the motor housing or the damper mount housing when a load is applied and the motor housing and the damper mount housing approach each other.
2 . The vehicle damper of claim 1 , wherein the second elastic member has higher rigidity than the first elastic member.
3 . The vehicle damper of claim 1 , wherein the second elastic member has an annular shape.
4 . The vehicle damper of claim 3 , wherein the motor housing has a shaft connected to the damper mount housing via the first elastic member,
the motor housing and the damper mount housing have opposing faces that are spaced from each other and face each other around the shaft,
the second elastic member is provided on the opposing face of at least one of the motor housing or the damper mount housing.
5 . The vehicle damper of claim 1 , further comprising a protrusion that protrudes from at least one of the motor housing or the damper mount housing toward the other of the motor housing or the damper mount housing to protect the second elastic member from excessive compression.
6 . The vehicle damper of claim 1 , wherein a contact surface of the second elastic member to be in contact with the other of the motor housing or the damper mount housing is inclined with respect to an opposing face of the other of the motor housing or the damper mount housing and is substantially parallel to a plane perpendicular to the direction of the linear motion of the movable member.