Step device for vehicle

1. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side; and

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot-joint point and bears a load of the support arm by coining into sliding contact with the support arm, wherein:

the support arm has a support bracket that is fixed to the vehicle body to form the first pivot-joint point, and

the pressure bearing member is provided on the support bracket.

2. The step device according to claim 1 , wherein the pressure bearing member has a sliding contact surface that extends in a direction intersecting the support arm.

3. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side;

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot-joint point and bears a load of the support arm by coming into sliding contact with the support arm; and

a holding member that is fixed to the movable step so as to hold, together with the movable step, the support arm at the second pivot-joint point, wherein the pressure bearing member is provided on the holding member.

4. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side; and

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot joint point and bears a load of the support arm by coming into sliding contact with the support arm,

wherein the pressure bearing member is made of a resin having a shock absorbing property and a self-lubricating property.

5. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side; and

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot-joint point and bears a load of the support arm by coming into sliding contact with the support arm,

wherein a ridge that extends in a direction intersecting the support arm and comes into sliding contact with the support arm is provided on a lower surface of the movable step.

6. The step device according to claim 5 , wherein:

the movable step includes a movable base to which the support arm is coupled, and a resin cover that is fixed to the movable base to be a step surface; and

the ridge is provided on a lower surface of the resin cover and protrudes toward a lower surface side of the movable step through a hole provided in the movable base.

7. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side; and

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot joint point and bears a load of the support arm by coming into sliding contact with the support arm,

wherein the support arm includes two main arms that are provided at positions apart from each other in the vehicle front-rear direction, and a sub-arm that has a joint at which the sub-arm is bendable and that is provided at a position apart from each of the main arms.

8. The step device according to claim 7 , wherein the sub-arm is provided between the main arms.

9. A step device for a vehicle, the step device comprising:

a movable step supported under a door opening;

a coupling member that, in a state of being supported by a sliding door that opens and closes in a vehicle front-rear direction with a shifting zone in a vehicle width direction, engages with the movable step to move the movable step in the vehicle width direction in conjunction with opening and closing of the sliding door;

a support arm that has a first pivot-joint point relative to a vehicle body and a second pivot-joint point relative to the movable step, and supports the movable step toward an upper side; and

a pressure bearing member that is provided at a position between the first pivot-joint point and the second pivot-joint point and bears a load of the support arm by coming into sliding contact with the support arm; and

a stopper that restricts a movable range of the movable step by coming into contact with the support arm.