A shock absorber assembly comprises two springs 11, 12 arranged in series so as, in use, to extend between a pair of spaced apart spring seats. A coupling member 13 is arranged between the adjacent ends 11b, 12a of the springs 11, 12. The coupling member 13 is adjustable and is formed by a shaft having a pair of flanges 14, 15 provided on the outer surface thereof. The shaft extends axially beyond each flange 14, 15 so as to extend inside the windings of the abutting spring ends 11b, 12a to locate the spring ends 11b, 12a on the coupler 13. Each flange 14, 15 engages an associated adjacent ends 11b, 12a of one of the springs 11, 12. At least one of said flanges 14, 15 is moveable longitudinally along the shaft so as to vary the longitudinal separation between the two flanges 14, 15 and thereby vary the preload on the springs 11, 12.

A three-row wheel vehicle having front, center and rear wheels has laterally spaced front pivot links each pivotably connected at a middle to a vehicle body, laterally spaced swing arms each swingably connected to a front end of the front pivot link and rotatably supports the front wheel at a lower end, laterally spaced rear pivot links each pivotably connected to the vehicle body at a middle and rotatably supports the rear wheel at a rear end, laterally spaced force transmission mechanisms each configured to convert a rearward force transmitted from the front wheel to the swing arm into an upward force and transmit the upward force to the front pivot link on a front side of the middle, and laterally spaced connecting links each pivotably attached to a rear end of the front pivot link and a front end of the rear pivot link.

A coil spring includes a wire rod and an elastic coat provided on the wire rod. The coil spring includes a coil section including a plurality of coil portions. The wire rod includes a round cross-sectional portion, a cross-section varying portion, and a rectangular cross-sectional portion along the longitudinal direction of the wire rod. The cross section of the rectangular cross-sectional portion is substantially square and has a first plane and a second plane. The first plane and the second plane oppose each other in the coil section. The elastic coat is provided on at least one of the first plane and the second plane. The elastic coat is continuous from the round cross-sectional portion to the cross-sectional variation portion and the rectangular cross-sectional portion.

A rear suspension structure includes a hub carrier having a wheel support portion by which a rear wheel is rotatably supported, the hub carrier includes a front arm portion that extends in a vehicle inner direction and toward the vehicle front side beyond an axle of the rear wheel and a rear arm portion that extends toward the vehicle rear side, the rear arm portion is coupled to a lateral beam extending in a vehicle width direction, on the vehicle rear side of the axle, a vehicle rear side end portion of a trailing arm extending in a vehicle front-rear direction is coupled to the lateral beam, and the front arm portion is coupled to a front arm attachment portion provided in the trailing arm.

A shock absorber adjuster assembly comprising at least one spring arranged so as, in use, to extend between a pair of spaced apart spring seats. At least one of the spring seats is adjustable and is formed by a cylindrical body, a first adjustable member and a second adjustable member. The body has a first thread formed on its outer surface and a second thread formed on its inner surface. The first adjustable member includes a first flange having a threaded inner surface which is engageable with the first thread of the body so that the first flange can be screwed along the first thread. The second adjustable member includes a second flange provided on an end of a shaft. The separation between the first and second flanges can thereby be adjusted by moving of either or both of said first and second flanges.

This disclosure concerns a propulsion and load distribution system for a pedal actuated vehicle. More specifically, this disclosure is directed to an electrically powered frame, trailer, vehicle, trailer, cart, and/or cycle coupled to at least one motorized wheel operably connected thereto. In some embodiments, the propulsion system can be operably associated with a load distribution system comprising a rocker arm and a spring that are configured to be associated with a frame having an axle or to which an axle can be mounted.

This disclosure concerns a propulsion and load distribution system for a pedal actuated vehicle. More specifically, this disclosure is directed to an electrically powered frame, trailer, vehicle, trailer, cart, and/or cycle coupled to at least one motorized wheel operably connected thereto. In some embodiments, the propulsion system can be operably associated with a load distribution system comprising a rocker arm and a spring that are configured to be associated with a frame having an axle or to which an axle can be mounted.

A robot according to an embodiment of the present disclosure may comprise: a base; a driving wheel protruding downward from the base; a plate spaced upward from the base; a through hole formed at the plate; a suspension bar including a shaft part rotatably connected to the base and vertically extending upward, and a screw part vertically extending from an upper end of the shaft part toward the through hole; a slider sliding along the shaft part and connected to the driving wheel; a bushing top configured to move up and down along the screw part when the suspension bar rotates; a spring located on an outer circumference of the suspension bar and located between the bushing top and the slider; and a motor disposed above the plate and connected to the screw part through the through hole to rotate the suspension bar.

A robot according to an embodiment of the present disclosure may comprise: a base; a driving wheel protruding downward from the base; a plate spaced upward from the base; a through hole formed at the plate; a suspension bar including a shaft part rotatably connected to the base and vertically extending upward, and a screw part vertically extending from an upper end of the shaft part toward the through hole; a slider sliding along the shaft part and connected to the driving wheel; a bushing top configured to move up and down along the screw part when the suspension bar rotates; a spring located on an outer circumference of the suspension bar and located between the bushing top and the slider; and a motor disposed above the plate and connected to the screw part through the through hole to rotate the suspension bar.

This spring used for a suspension device for a vehicle is provided with: a metal wire material which constitutes a spring section and which has a cover layer provided on the surface thereof; and a seat section which is subjected to a load acting on the spring section, is formed from an elastically deformable material, has a groove section into which the wire material fits, and is bonded to the wire material by an adhesive. The minimum thickness of the portion of the adhesive, which protrudes from the groove section, is greater than or equal to the thickness of an adhesion layer formed in the groove section.