Cam and non-circular gear pair for unpowered multi-joint synchronous training device, manufacturing method thereof, transmission mechanism using the same, and unpowered multi-joint synchronous training device

A non-circular gear pair for an unpowered multi-joint synchronous training device, comprising a driving non-circular gear and a driven non-circular gear in driving engagement with the driving non-circular gear, wherein

• the driving non-circular gear and the driven non-circular gear have the same number of teeth and a fixed center distance;
• a pitch line of the driving non-circular gear and the driven non-circular gear is configured such that for each rotation of the driving non-circular gear, the driving non-circular gear drives a follower disposed on a first side surface of the driven non-circular gear to perform variable-speed reciprocating motion once between a first position and a second position;
• the first position is a position of the follower closest to an axis of rotation of the driving non-circular gear, and the second position is a position of the follower farthest from the axis of rotation of the driving non-circular gear;
• and
• the variable-speed reciprocating motion drives a driven object connected to the follower to perform variable-speed oscillation within a first range of angles.

A method of manufacturing a cam, comprising the steps of:

• (a) providing a circular main body, and disposing a follower on a side surface of the circular main body, the follower being movable on the side surface only in a horizontal direction;
• (b) allowing the follower to perform variable-speed reciprocating motion once between a first position and a second position on the side surface of the circular main body;
• (c) rotating the circular main body at a constant speed while executing the step (b), wherein a period when the follower performs the variable-speed reciprocating motion once is the same as a period when the circular main body rotates once;
• and
• (d) taking a trace of movement of the follower on the side surface of the circular main body as a cam contour to form a cam slot on the side surface of the circular main body, wherein a distance between the first position and a center of the circular main body is equal to a distance between a position of the cam contour closest to the center of the circular main body, and a distance between the second position and the center is equal to a distance between a position of the cam contour farthest from the center of the circular main body.

A method of manufacturing a non-circular gear pair, comprising the steps of:

• providing a driving non-circular gear and a driven non-circular gear engaged with each other, wherein the driving non-circular gear and the driven non-circular gear have the same number of teeth and a fixed center distance, and
• disposing a follower on a side surface of the driven non-circular gear, wherein a pitch line of the driving non-circular gear and the driven non-circular gear is configured such that for each rotation of the driving non-circular gear, the driving non-circular gear drives the follower to perform variable-speed reciprocating motion once between a first position and a second position, wherein
• the first position is a position of the follower closest to an axis of rotation of the driving non-circular gear, and the second position is a position of the follower farthest from the axis of rotation of the driving non-circular gear;
• and
• the variable-speed reciprocating motion drives a driven object connected to the follower to perform variable-speed oscillation within a first range of angles.

A transmission mechanism for an unpowered multi-joint synchronous training device, comprising:

• a wheel assembly;
• a transmission assembly in driving connection with the wheel assembly;
• a drive assembly in driving connection with the transmission assembly, and having a cam;
• and
• a leg rod assembly connected to the drive assembly through a connecting rod, such that the leg rod assembly oscillates under driving of the transmission assembly, wherein
• the cam has a circular main body, a first cam slot disposed on a first side surface of the circular main body and a second cam slot disposed on a second side surface of the circular main body opposite to the first side surface, the first cam slot has a first contour and the second cam slot has a second contour different from the first contour, the first and second contour are configured such that rotational movement of the cam drives a first follower provided in the first cam slot and a second follower provided in the second cam slot to perform variable-speed reciprocating motion along a predetermined horizontal axis;
• for each rotation of the cam, the first follower performs a first reciprocating motion once between a first position and a second position on the predetermined horizontal axis, and the second follower performs a second reciprocating motion once between a third position and a fourth position on the predetermined horizontal axis;
• the first position is a position of the first follower along the horizontal axis when the first follower is at a position of the first contour closest to a center of the circular main body, and the second position is a position of the first follower along the horizontal axis when the first follower is at the position of the first contour farthest from the center of the circular main body;
• the third position is a position of the second follower along the horizontal axis when the second follower is at a position of the second contour closest to the center of the circular main body, and the fourth position is a position of the second follower along the horizontal axis when the second follower is at the position of the second contour farthest from the center of the circular main body;
• the first reciprocating motion drives a driven object connected to the first follower to perform variable-speed oscillation within a first range of angles, the second reciprocating motion drives another driven object connected to the second follower to perform another variable-speed oscillation within a second range of another angles.

A transmission mechanism for an unpowered multi-joint synchronous training device, comprising:

• a wheel assembly;
• a transmission assembly in driving connection with the wheel assembly;
• a drive assembly in driving connection with the transmission assembly, and having a non-circular gear pair;
• and
• a leg rod assembly connected to the drive assembly through a connecting rod, such that the leg rod assembly oscillates under driving of the transmission assembly, wherein
• the non-circular gear pair comprising a driving non-circular gear and a driven non-circular gear in driving engagement with the driving non-circular gear, the driving non-circular gear and the driven non-circular gear have the same number of teeth and a fixed center distance, a pitch line of the driving non-circular gear and the driven non-circular gear is configured such that for each rotation of the driving non-circular gear, the driving non-circular gear drives a follower disposed on a first side surface of the driven non-circular gear to perform variable-speed reciprocating motion once between a first position and a second position;
• the first position is a position of the follower closest to an axis of rotation of the driving non-circular gear, and the second position is a position of the follower farthest from the axis of rotation of the driving non-circular gear;
• and
• the variable-speed reciprocating motion drives a driven object connected to the follower to perform variable-speed oscillation within a first range of angles.

An unpowered multi-joint synchronous training device, comprising:

• a body frame;
• and
• a first transmission mechanism and a second transmission mechanism mounted on both sides of the body frame;
• wherein
• a drive assembly of the first transmission mechanism and a drive assembly of the second transmission mechanism are connected by a shaft lever, and have a directional difference of 180°, and
• the shaft lever comprises a first rod portion, and a second rod portion connected to the first rod portion through a clutch.