Supplemental turning function-equipped hub unit and vehicle
A supplemental turning function-equipped hub unit includes: a hub unit body including a hub bearing; and a unit support member configured to be mounted through a suspension device, the unit support member supporting the hub unit body through rotation-permitting support components at two upper and lower portions of the hub unit body such that the hub unit body is rotatable about a supplemental turning axis. A supplemental turning force receiving part is provided on a side part of the hub unit body, which part is configured to receive a force that causes the hub unit body to rotate about the supplemental turning axis.
1. A supplemental turning function-equipped hub unit comprising:
a hub unit body including a hub bearing configured to support a wheel;
a unit support member configured to be mounted to a vehicle body through a suspension device and to be rotatably coupled with a tie rod of a steering device, the unit support member supporting the hub unit body through rotation-permitting support components at two portions of upper and lower portions of the hub unit body such that the hub unit body is rotatable about a supplemental turning axis extending in a vertical direction;
a supplemental turning force receiving part protruding from a side part of the hub unit body, the supplemental turning force receiving part being configured to receive a force that causes the hub unit body to rotate about the supplemental turning axis; and
a supplemental turning actuator, supported by the unit support member, configured to apply a driving force via a linear mechanism to cause a force to be applied to the supplemental turning force receiving part in a direction parallel to an axis of rotation of the wheel, to thereby cause the hub unit body to rotate about the supplemental turning axis with respect to the unit support member.
2. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein at least a portion of the supplemental turning actuator is mounted to a first side of the unit support member which is opposite to a second side of the unit support member facing the hub unit body.
3. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein the linear mechanism passes through a portion of the unit support member, and includes one end portion to receive the driving force and another end portion coupled to the supplemental turning force receiving part via a joint to apply the force to the supplemental turning force receiving part in the direction parallel to the axis of rotation of the wheel.
4. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein each of the rotation-permitting support components includes a spherical sliding bearing.
5. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein each of the rotation-permitting support components is a tapered roller bearing, or an angular ball bearing, or a four-point-contact ball bearing.
6. A vehicle comprising the supplemental turning function-equipped hub unit as claimed in claim 1 ,
wherein one or both of front wheels and rear wheels are supported by the supplemental turning function-equipped hub unit.
7. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein the supplemental turning force receiving part protrudes in a direction perpendicular to the supplemental turning axis.
8. The supplemental turning function-equipped hub unit as claimed in claim 1 , wherein the supplemental turning axis extends in the vertical direction and passes through a portion of the wheel.