摘要:
A leg joint assist device (11) of a legged mobile robot, comprising a spring means (21)(gas spring). A piston (24) in a cylinder (23) is vertically moved according to the relative displacement motion (bending and stretching motion) of a femoral region (4) and a crural region (5) at the knee joint (8) of the leg (3) of the robot. A gas is filled in gas chambers (25) and (26) on the upper and lower sides of the piston (24). When the degree of the bending of the leg body at the knee joint (8) is equal to or less than a specified value, the gas chambers (25) and (26) are allowed to communicate with each other through grooves (28) in the cylinder (23), and the spring means (21) does not produce an elastic force. When the degree of the bending exceeds the specified value, the gas chambers (25) and (26) are brought into a sealed state with each other, and the spring means (21) produces an elastic force which acts on the knee joint (8) as an auxiliary drive force. Thus, a burden on the joint actuator of the leg can be reduced while reducing the energy consumption of the robot by a compact and simple structure. Also, a variation in the characteristics of the auxiliary drive force of the spring means (21) against the degree of the bending of the knee joint (8) can be suppressed.
摘要:
While a solenoid valve (23) of a gas passage (22) communicating with gas chambers (16, 17) is closed, an assist device (12) produces an assisting drive force by compression/expansion of a gas when a leg (3) flexes/stretches at a knee joint (specific joint) (8) and acts the force on the knee joint (8). While the solenoid valve (23) is open, no assisting drive force is produced. The solenoid valve (23) has a self-holding function. The solenoid valve (23) is so provided in the gas passage (22) that the difference between the pressures in the gas chambers (16, 17) acts so that the valve is closed during a predetermined period during which the solenoid valve (23) is closed. With this, the power consumption of the solenoid valve can be effectively reduced through a simple structure.
摘要:
A floor reaction detector of a legged mobile robot having at least an upper body, a plurality of leg parts connected to the upper body through first articulations, and leg parts connected to the end parts of the leg parts through second articulates, disposed between the second articulates and the ground-contact ends of the leg parts, wherein the upper parts of the floor reaction detectors are connected to near the second articulates, a spring mechanism body lower in rigidity than a member forming a part near the second articulate is installed at the ground-contact ends of the leg parts, and the lower parts of the floor reaction detectors are connected to the ground-contact ends of the leg parts through the spring mechanism bodies, whereby a controllability is not deteriorated since a detection accuracy is increased, and the affection of impact at the time of ground-contact can be reduced while stably holding an attitude in standing state.
摘要:
A displacement sensor (70) for producing an output showing the displacement of the ground-contact end of a foot unit (22) with respect to a second joint (18, 20) is provided inside or in the vicinity of an elastic element (382), and a floor reaction force acting on a foot unit based on an output from the displacement sensor is calculated by using a model that describes the relation between displacement and stress produced at an elastic element according to the displacement of the sensor, whereby it is possible to calculate a floor reaction force accurately and let a leg-type moving robot (1) walk further more constantly. In addition, dissimilar detection means are combined to form a dual system of sensors for an improved reliability in detection. A reliability in detection is further improved by a displacement sensor or the like that self-diagnoses whether or not it is deteriorated or abnormal and by temperature compensation without the provision of a temperature sensor.
摘要:
A legged mobile robot (R), comprising an upper body (R2), leg parts (R1) connected to the upper body (R2) through first articulates (12, 13), foot parts (17) connected to the end parts of the leg parts (R1) through second articulates (15, 16). The legged mobile robot (R) is characterized in that the foot parts (17) comprise foot flat parts (61) having, at the lower end parts, ground-contact areas (64, 66) in contact with a floor surface, and the foot flat parts (61) comprise leaf spring parts (62) supporting the self-weight of the robot while deflecting when coming into contact with the floor surface.
摘要:
An assist device 12 for imparting an auxiliary driving force to a joint 8 in parallel with a driving force from a joint actuator 10 is installed between a femoral portion 4 and a crus portion 5 that are a pair of link members of a leg 3. The assist device 12 produces the auxiliary driving force by a spring means 15 such as a solid spring or air spring. A member 17 for holding a rod member 16 connected to the spring means 15 is provided with a means for transmitting the bending and stretching motion relative displacement motion between the femoral portion 4 and crus portion 5 of the leg 3 in the joint 8 to a spring means 15 to cause the latter to generate elastic force or for cutting off the transmission of bending and stretching motion to the spring means 15. This means is controlled according to the gait of the robot 1. This makes it possible to reduce the load on the joint actuator 10 as the need arises and to stably secure satisfactory energy utilization efficiency.
摘要:
A device (18) for absorbing floor-landing shock provided in a foot mechanism (6) of a leg of a robot. The device comprises an inflatable/ deflatable bag-like member (19) (variable volume body) on the ground contact surface side of the foot mechanism (6). The bag-like member (19) is formed of an elastic material such as rubber and has a restoration capability. The inside of the bag-like member (19) is open to the atmosphere through a passage (20). W hen the leg lands on the floor, the bag-like member (19) touches the ground and is compressed, causing air in the bag-like member to flow out into the atmosphere through the passage (20), which produces an outflow resistance. This reduces floor-landing shock. While the leg body is off the floor, the bag-like member (19) is inflated by the restoring capability of the member as air flows into it. The shock load in floor-landing of the leg body of a legged mobile robot can be reduced smoothly by a light-weighted structure.
摘要:
A legged mobile robot (1) and a control device for the robot, the robot comprising leg parts (22, 222, 223, 224) having leg part bodies (22m, 222m, 223m, 224m) and toe parts (22t, 222t, 223t, 224t) formed at the front end of the leg part body and allowed to bent and a bend angle holding mechanism (damper (50), friction brake (60)) capable of holding the bend angle (thetat) of the toe part. In the control device for the robot, the bend angle of the toe part is held when the leg part leaves a floor or at a first timing (t1) before the leg part leaves the floor, and the toe part is returned to an initial position at a second timing (t2) after the leg part leaves the floor. Accordingly, since the bend angle when the leg part leaves the floor can also be continuously held after the leg part leaves the floor, the attitude of the robot can be prevented from becoming unstable by the contact of the toe part with the surface of the floor immediately after the leg part leaves the floor. Also, the stability of the robot when it stands on tiptoe can also be increased.
摘要:
A device (18) for absorbing floor-landing shock provided in a foot mechanism (6) of a leg of a robot. The device comprises an inflatable/ deflatable bag-like member (19) (variable volume body) on the ground contact surface side of the foot mechanism (6). The bag-like member (19) is formed of an elastic material such as rubber. Air in the atmosphere can flow in and flow out of the bag-like member (19) through inflow/ outflow means (20) provided with a solenoid valve (27) etc. When the foot sole mechanism (6) is off the floor, air flow into the bag-like member (19) is controlled so that the height of the bag-like member (19) in the final inflation state is controlled to a height corresponding to the gait form of the robot. The shock load when the leg body of the legged mobile robot lands on the floor is reduced appropriately in accordance with the gait form of the robot while at the same time posture stability of the robot is ensured easily, and, further, the robot can be structured light in weight.