A transmission structure for a bicycle includes two opposite transmission units. Each of the transmission units includes a linear reciprocating pedaling mechanism, a transmission module which is in transmission connection with the linear reciprocating pedaling mechanism, and a resetting module connected with the transmission module. The transmission modules of the two transmission units are connected with a power output mechanism through a unidirectional transmission mechanism. The transmission module includes a first driven wheel and a first transmission gear configured to be coaxial with the first driven wheel. The resetting module includes a connecting piece and an elastic piece. The connecting piece is connected with the first transmission gear. The elastic piece is connected with the connecting piece.

A damper device includes: an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, the input shaft member including a flange portion of the crankshaft; an output shaft member capable of outputting the driving force transmitted from the input shaft member; an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member; rolling members pivotable on the input side cam; and an urging member urging the output side cam so as to cause it to abut the rolling members, wherein the input side cam has receiving portions recessed so as to receive the rolling members, and supply passages extending through the flange portion and the input side cam has: inlets communicated with an oil sump space; and outlets formed at the receiving portion of the input side cam.

A damper device includes: an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, the input shaft member including a flange portion of the crankshaft; an output shaft member capable of outputting the driving force transmitted from the input shaft member; an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member; rolling members pivotable on the input side cam; and an urging member urging the output side cam so as to cause it to abut the rolling members, wherein the input side cam has receiving portions recessed so as to receive the rolling members, and supply passages extending through the flange portion and the input side cam has: inlets communicated with an oil sump space; and outlets formed at the receiving portion of the input side cam.

A damper device according to the present invention includes an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, an output shaft member capable of outputting the driving force transmitted from the input shaft member, an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member, and a damper bearing pivotable on the input side cam or the output side cam, wherein a damper bearing assembly has a bearing shaft supporting a plurality of damper bearings, bearing axes of the plurality of damper bearings are arranged along a bearing shaft axis of the bearing shaft, the bearing shaft is orthogonal to a rotation axis, and a shaft support portion supporting the bearing shaft, is provided between the adjacent damper bearings of the damper bearing assembly.

A damper device according to the present invention includes an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, an output shaft member capable of outputting the driving force transmitted from the input shaft member, an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member, and a damper bearing pivotable on the input side cam or the output side cam, wherein a damper bearing assembly has a bearing shaft supporting a plurality of damper bearings, bearing axes of the plurality of damper bearings are arranged along a bearing shaft axis of the bearing shaft, the bearing shaft is orthogonal to a rotation axis, and a shaft support portion supporting the bearing shaft, is provided between the adjacent damper bearings of the damper bearing assembly.

A ride-along vehicle may include a guard that attaches to a bottom portion of a molded plastic body and covers a spring and chain assembly. The guard may also provide an attachment point for the spring through a hole in the guard. The guard may have a narrow portion that covers and helps retain the chain on a sprocket as well as a wider portion that covers the spring. An improved pumper arm and steering mechanism may include a pivot joint that is provided by rods, pins, or bolts attached to opposite sides of the pumper arm. The universal joint between the steering arm and the pumper arm can be aligned with the center of the pivot point to prevent rocking of the steering arm as the pumper arm is actuated.

A ride-along vehicle may include a guard that attaches to a bottom portion of a molded plastic body and covers a spring and chain assembly. The guard may also provide an attachment point for the spring through a hole in the guard. The guard may have a narrow portion that covers and helps retain the chain on a sprocket as well as a wider portion that covers the spring. An improved pumper arm and steering mechanism may include a pivot joint that is provided by rods, pins, or bolts attached to opposite sides of the pumper arm. The universal joint between the steering arm and the pumper arm can be aligned with the center of the pivot point to prevent rocking of the steering arm as the pumper arm is actuated.

A rotation transmission mechanism of the invention includes an inner rotating member and an outer rotating member that is rotatably disposed with respect to the inner rotating member. The inner rotating member includes an outer peripheral protruding portion that protrudes toward an outer peripheral side. The outer rotating member includes an annular portion and an inner peripheral protruding portion. The outer peripheral protruding portion has a forward movement surface at a position shifted from a center of the outer peripheral protruding portion in a forward rotational direction in which the rotation transmission mechanism is rotated by forward movement. An elastically deformable portion is disposed between the forward movement surface and the inner peripheral protruding portion. The outer peripheral protruding portion and the annular portion are provided with guide portions that guide the outer peripheral protruding portion so as to slidably move in a rotational direction of the rotation transmission mechanism with respect to the annular portion.

A rotation transmission mechanism of the invention includes an inner rotating member and an outer rotating member that is rotatably disposed with respect to the inner rotating member. The inner rotating member includes an outer peripheral protruding portion that protrudes toward an outer peripheral side. The outer rotating member includes an annular portion and an inner peripheral protruding portion. The outer peripheral protruding portion has a forward movement surface at a position shifted from a center of the outer peripheral protruding portion in a forward rotational direction in which the rotation transmission mechanism is rotated by forward movement. An elastically deformable portion is disposed between the forward movement surface and the inner peripheral protruding portion. The outer peripheral protruding portion and the annular portion are provided with guide portions that guide the outer peripheral protruding portion so as to slidably move in a rotational direction of the rotation transmission mechanism with respect to the annular portion.

A means of transport, in particular a pedelec, which can be driven by means of drive energy produced electromotively and by human muscular power, comprising a drive unit in which an electric drive motor and a harmonic drive transmission are nested one inside the other, thereby saving space.