Abstract: The present disclosure relates to an all-terrain vehicle and an exhaust assembly for an all-terrain vehicle. The all-terrain vehicle includes: a frame, a V-type twin-cylinder engine and an exhaust assembly. The V-type twin-cylinder engine has a first exhaust port and a second exhaust port, and a cylinder corresponding to the first exhaust port is located in front of a cylinder corresponding to the second exhaust port. The V-type twin-cylinder engine is mounted on the frame. The exhaust pipe group has a first end coupled to the first exhaust port, a second end coupled to the second exhaust port, and a third end coupled to a pipe of the muffler. The exhaust pipe group is divided into at least two exhaust pipes, and adjacent exhaust pipes are flexibly coupled.

Abstract: An example engine driven welder/generator system is disclosed that includes a turbo charged gasoline powered engine connected to an electric welder/generator. The welder/generator is configured to provide an output to an auxiliary welding system. The turbo charger system enhances operation of the gasoline engine by powering a turbine with engine exhaust to drive a compressor to increase intake of air, resulting in compressed air providing more powerful explosions in an engine combustion chamber once fuel is added and ignited. The resulting engine drives the welder/generator to provide a more consistent torque curve, while generating less noise per unit of power output in comparison to a diesel engine.

Abstract: A suspension control device is provided for a human-powered vehicle. The suspension control device includes a sensor and an electronic controller. The sensor is configured to detect information relating to a ground contact condition. The electronic controller is configured to selectively control a suspension of the human-powered vehicle in accordance with the information detected by the sensor.

Abstract: An electric drive motorcycle (100), comprises: a front portion comprising one or more front wheels (103) and a handlebar (104); a rear portion comprising a saddle (101), a shell body (107) arranged below said saddle (101), and a rear wheel (105) arranged below said shell body (105); an intermediate portion (108) extending as a connection between said front portion and said rear portion; an electric drive unit (8) connected to said rear wheel (105); a power supply unit feeding said electric drive unit (8); and a helmet carrying compartment (11) placed in the shell body (107) below the saddle (101), wherein said power supply unit is arranged in a position below said helmet carrying compartment (11), so that said saddle (101), said helmet carrying compartment (11) and said power supply unit are substantially stacked on each other, being said helmet carrying compartment (11) and said power supply unit arranged inside the shell body (107), wherein said supply unit comprises a battery unit (15) or a battery unit (1

Abstract: A starting protector for an all-terrain vehicle is provided and includes a shaft, a driven wheel fitted over the shaft and comprising a tooth portion, a sleeving portion and a locking portion, and the tooth portion being configured to be connected with an engine; a driving wheel fitted over the sleeving portion, one side of the driving wheel being attached to the tooth portion, and the driving wheel being configured to be connected with a starting motor; a friction piece fitted over the sleeving portion and being in synchronous rotation with the sleeving portion, the friction piece being attached to the other side of the driving wheel, and when starting torque of the engine exceeds a preset value, the driving wheel and the friction piece slipping relatively; and a compressing assembly fitted over the sleeving portion and the locking portion to compress the friction piece and the driving wheel.

Abstract: A storage box power supply structure for a saddled vehicle includes a storage box (30), a carrier (50) configured to detachably mount the storage box (30) on a vehicle body, a hook (33) configured to connect the storage box (30) to the carrier (50), a hook receiving section (53) configured to receive the hook (33), a hook-side terminal (70) provided inside the hook (33) and configured to supply electric power to an electrical component (46), and a receiving-side terminal (80) provided in the hook receiving section (53) and connected to the hook-side terminal (70) when the storage box (30) is mounted on the carrier (50).

Abstract: A motorcycle includes a pair of left and right front forks, a headlight, cover members (side cowls and light covers), and camera units. A front wheel is rotatably attached to the pair of left and right front forks. The headlight irradiates a forward side. The cover members each having an internal space are disposed at least laterally outside the pair of left and right front forks in a front view. The camera units detect the forward side by acquiring visible light which is one kind of electromagnetic waves (by acquiring images). In a front view, the camera units are disposed below the headlight and laterally outside the pair of left and right front forks. The camera units are disposed in the internal spaces of the cover members.

Abstract: An all-terrain vehicle (“ATV”) comprising a frame, a plurality of ground engaging members supporting the frame, a straddle seat coupled to the frame for supporting at least one rider, a powertrain assembly operably coupled to the ground engaging members, the powertrain assembly comprising an engine, a storage container coupled to the frame at a position rearward of the straddle seat, an exterior surface of the storage container including an indentation, and a fuel system fluidly coupled to the engine, the fuel system including a fuel tank, a fuel vapor line fluidly coupling the fuel tank to the engine, and an evaporation canister positioned along the fuel vapor line, wherein the evaporation canister is positioned within the indentation in an exterior surface of the storage container.

Abstract: A hydraulic master apparatus for a hydraulic brake or clutch of handlebar-guided vehicles having a handlebar tube includes a support, a lever pivotally connected to the support, a hydraulic cylinder sized to fit in the handlebar tube and having a piston, and a pulling device configured to exert a pulling force on the piston when the lever is actuated. The apparatus also includes a grip width adjusting apparatus, by which a distance between the support for the lever and the hydraulic cylinder is adjusted to adjust a grip width. Also included is a cover that, responsive to being connected in the handlebar tube, defines with the hydraulic cylinder in the handlebar tube a compensating chamber therebetween.

Abstract: A hybrid vehicle includes: a crankcase having a main chamber formed in a case body and accommodating at least a crankshaft, an input shaft, an output shaft, and a gear train, the crankcase further having a subsidiary chamber formed between the case body and a cover and accommodating at least a main clutch; a rotary member disposed in the subsidiary chamber so as to be capable of power transmission to the input shaft; and a power transmission member that transmits drive power from a drive motor to the rotary member.

Abstract: A high performance synchronous transmission to be used aboard a motorcycle for transmitting the motion generated by an engine to a driving wheel, between a crankshaft and a hub shaft parallel therebetween and perpendicular to the median plane of the motorcycle, comprising on the crankshaft a centrifugal clutch, for the automatic engagement of the first speed above a predetermined rotation regime, and a driving pulley apt to transmit the motion through a subsequent kinematic chain, is provided with a coupling between crankshaft and driving pulley which connects them directly, by determining with its own engagement the exclusion of said centrifugal clutch, said coupling being controlled in disengagement when a control lever is in active position.

Abstract: A dual-motor differential drive system, including a main wheel, a drive wheel, a differential unit, a first motor, a second motor, and at least one drive unit, is provided. The main wheel has a central shaft. The drive wheel is disposed on the main wheel. The differential unit is disposed on a side of the drive wheel and aligned with the drive wheel. The first motor and the second motor respectively have a first shaft and a second shaft, and are connected to the differential unit. The at least one drive unit is disposed on the differential unit and the drive wheel. The first motor and the second motor are adapted to run in same or reverse direction to respectively drive the differential unit to rotate. The differential unit drives the drive wheel through the at least one drive unit, enabling the main wheel to pivot through the central shaft.

Abstract: A tilt control system for a sidecar and a motorcycle. The tilt control system can include a main frame, a tilting frame, and an actuator. The actuator can be coupled to the main frame and to the tilting frame, and can be configured to control tilting of the tilting frame relative to the main frame. The tilt control system can include a sensor, and a controller in communication with the actuator and the sensor. The controller can be configured to determine an operating parameter based on sensor data received from the sensor, compare the operating parameter to a threshold criteria, and cause the actuator to control the orientation of the tilting frame relative to main frame, based on the comparison of the operating parameter to the threshold criteria.

Abstract: A windscreen device for a saddled vehicle, according to which a height of a windscreen is adjustable according to a body frame or preference of a user, and according to which support stiffness for the windscreen can be secured and a windscreen support section can be miniaturized. Up-down movement of the windscreen is operated with a screen raising/lowering switch provided on a vehicle body side. A windscreen device includes a base member provided on the vehicle body side to guide the up-down movement of the windscreen, and a slider provided on the windscreen side to be slidably engaged with the base member. A rack is provided on one of the base member and the slider, and an electric motor for rotating a pinion that is meshed with the rack is provided on the other.

Abstract: An electric vehicle rechargeable via electric power transferred from a power outlet separate from the vehicle includes a seat movable between a first position for supporting a person and a second position. A caddy is positioned below the seat to define a cable storage volume. The cable storage volume is accessible when the seat is in the second position. A charging port is positioned outside of the caddy and accessible with the seat in the first position. A charging cable is positioned within the caddy, the charging cable having a first end engageable with the charging port of the vehicle and a second end engageable with the power outlet. The first and second ends of the charging cable are removable from the caddy when the seat is in the second position to enable charging the electric vehicle via the charging cable and the charging port.

Abstract: An air intake structure of a saddle riding vehicle is disposed in the saddle riding vehicle in which a frame including a left and right pair of main frames and an air box are disposed, an intake passage is disposed between the main frames and an outer periphery of the head tube, and the intake passage includes: a front side intake duct that extends forward; and a rear side intake duct that couples the air box to the head tube. In the air intake structure of the saddle riding vehicle, the rear side intake duct is a separate body from the air box, the air box has a front surface on which an opening inserted through the rear side intake duct is provided, and the rear side intake duct is coupled to an intake passage from an inside of the air box through the opening.

Abstract: In this brake control device for a motorcycle, a deceleration threshold value calculation unit limits target wheel deceleration to a threshold value or less on the basis of a bank angle estimated by a bank angle calculation unit. Thus, the behavior of the vehicle body during turning of the motorcycle can be made more stable so as not to cause discomfort to a driver.

Abstract: A vehicle with a power unit includes: a body frame with said power unit mounted to said body frame; at least one front wheel supported by the body frame in a front portion, and at least one rear wheel supported by the body frame in a rear portion; an electric machine capable of assisting said power unit; and an auxiliary power source electrically connected to said electric machine. The vehicle further includes a first set of foot pegs for a rider and a second set of foot pegs for a pillion. A quadrilateral region is defined between said first set of foot pegs and said second set of foot pegs, and said electric machine and said auxiliary power source are disposed substantially within said quadrilateral region when viewed from vehicle top.

Abstract: Embodiments of the present disclosure relate to a chassis for a two-wheeler. The chassis includes a first downtube and a second downtube and a battery mounting system. The battery mounting system includes a movable battery housing configured to house a battery under a seat of the two-wheeler and move between a closed position and an open position, at least two support members configured to support the movable battery housing, and at least one pivot hinge coupled to a front side of the movable battery housing and supporting the movable battery housing. The at least two support members and the at least one pivot hinge are configured to enable an angular movement of the movable battery housing with respect to a seat axis between the open position and the closed position, thereby enabling replacement of the battery located under the seat of the two-wheeler, while maintaining a closed seat position of the seat.

Abstract: A cushion connecting rod of a saddled vehicle is configured in such a manner that an initial failure condition can be visually recognized in combination with fiber composite material and metal without using a special adhesive. A cushion connecting rod as a long member applied with a load when a swing arm is swung against a springing force of a rear cushion is configured in such a manner that a part of a surface of a metallic member is covered with an endless fiber-reinforced plastic. The fiber-reinforced plastic adheres to the surface of the metallic member with a film adhesive. Supporting portions applied with the load are provided at both ends in a longitudinal direction of the metallic member. A recessed portion and a plurality of lightening holes are formed between the supporting portions at both the ends, the recessed portion being configured in such a manner that a thickness dimension of the metallic member is set to be smaller than a thickness dimension of the supporting portions.

Abstract: In a saddle riding vehicle including: a sprocket driven by a power transmission member; a sprocket support member that supports the sprocket and that is connected with a wheel; a damper member that is housed in a recessed portion in a hub of the wheel and disposed between the hub and the sprocket support member, the damper member being deformed through a relative rotation between the hub and the sprocket support member; and a resistance mechanism that dampens the relative rotation between the hub and the sprocket support member, the sprocket support member includes an extension portion that covers an outer periphery of the hub from an outside in a radial direction, and the resistance mechanism is disposed between an inner periphery of the extension portion and the outer periphery of the hub.

Abstract: A saddle riding vehicle includes a body frame, an exhaust pipe, a muffler, and a catalyst. The body frame includes a main frame, a seat frame that extends rearward from the main frame and supports a seat for occupant, and a rear frame that extends from the main frame upward to a rear and is connected to the seat frame. The exhaust pipe extends rearward of the vehicle from an exhaust port of an engine. The muffler is connected to a rear end portion of the exhaust pipe. The catalyst is disposed in the muffler. An air cleaner box is disposed rearward of the engine. The catalyst disposed in the muffler is disposed in a space surrounded by the main frame, the seat frame, and the rear frame and overlaps with the air cleaner box as viewed in a side view of the vehicle.

Abstract: A saddle-riding type vehicle is provided in which a water-cooled internal combustion engine, a radiator and a fuel tank are supported on a vehicle body frame. A canister that collects fuel vaporized within the fuel tank is disposed in front of the radiator in a vehicle fore-and-aft direction when viewed from a side. This can enhance the effect in cooling the canister.

Abstract: Provided is a seat frame for a saddled vehicle capable of increasing the coupling rigidity at the separable rear end and having aesthetic aspect. A seat frame of a vehicle body frame includes a front part fixed to the vehicle body frame and a rear part that can be disconnected from the front part, the front part and the rear part being separated at a rear part of the vehicle body. The front part and the rear part are fixed with a fastening member that engages from the inside of the vehicle width direction. The front part has a hollow rear end, and the rear part includes a solid engagement part at the front end. The fastening member as a bolt penetrates through the lateral wall at the rear end to be screwed with the engagement part inserted into the rear end. The rear part includes the engagement part and a pipe member to be connected to a rear part of the engagement part.

Abstract: A tank assembly is supported against movement on a frame of a two-wheeled vehicle such as a motorcycle by support elements that engage respective bearing elements on lateral sides of the frame. An associated securing element is secured to each lateral side of the frame element in the region adjacent to the respective bearing elements. The securing elements surround the associated support element at a spacing, being arranged to limit movement of the securing elements and the tank away from the frame.

Abstract: A motorcycle, or saddle type vehicle, is disclosed that may have at least one seat and at least two wheels, at least one hub electric motor. A large dry storage compartment may be positioned between the rider and steering mount. A rechargeable battery and battery management system may be located below the storage compartment in a battery housing, where the battery housing may be a structural component of the chassis. A rear electronics housing may be attached to and located behind the battery housing, and may contain major electrical components such as electric motor controller and contactors. Two structural members, or frame side rails, may form sides of the storage compartment and extend between the electronics housing and steering mount. The electronics housing may also connect to the battery housing such that the battery housing reinforces and strengthens the chassis, or structural frame.

Abstract: A fastening system for attaching a component to the monocoque of a motorcycle. The fastening system promotes a plurality of riding configurations for the motorcycle. The fastening system includes an assembly of a track and a movable foot piece. The movable foot piece slides along and is locked in the track to secure the component to the track according to a desired riding configuration of the motorcycle. When the component is the headstock, the fastening system allows for a change in the rake angle.

Abstract: According to an aspect of the disclosed embodiments, an apparatus for a motorcycle includes a first component having a pair of arms configured to be coupled to an inner shaft of a suspension fork. A locking plate is coupled to the pair of arms. A second component includes a housing configured to be coupled to a telescopic outer shaft of the suspension fork. The housing extends along a first longitudinal axis. A pin is configured to rotate about a second longitudinal axis extending transverse to the first longitudinal axis relative to the housing. The pin has a tip configured to engage the locking plate of the first component.

Abstract: A mounting system for mounting a number plate carrier on a vehicle component of a single-track motor vehicle is provided. The vehicle component consists of a vehicle frame, a rear carrier component which is fixed to the vehicle frame. The number plate carrier has at least one securing hook, and the rear carrier component has at least one corresponding through-engagement opening. The number plate carrier can be hooked by the at least one securing hook into the respective through-engagement opening, aligned on the vehicle component in a predetermined position and pre-fixed securely in position. The number plate carrier can be fastened to the vehicle frame by a fastener spaced apart from the at least one securing hook along a longitudinal axis of the single-track motor vehicle.

Abstract: In a body frame, a pair of left and right main frames extend downward to the rear from the upper portion of a head pipe and a down frame extends downward to the rear from the lower portion of the head pipe, a gusset is provided in the body frame, the gusset being joined to the head pipe, and the gusset includes a center wall portion and lower extension portions, the center wall portion being disposed between inner side wall portions of the left and right main frames, the lower extension portions extending downward from the center wall portion and being joined to outer side surfaces of the down frame.

Abstract: A saddle riding vehicle includes a body frame, an engine supported by the body frame, an exhaust sensor that detects exhaust air of the engine, and a radiator for the engine. The engine is supported by an engine hanger portion disposed in the body frame. The exhaust sensor is disposed on an exhaust pipe of the engine at a position on a front with respect to the engine hanger portion and is positioned underneath the radiator. At least a part of the exhaust sensor overlaps the engine hanger portion as viewed in a front view of a vehicle.

Abstract: A motorcycle includes an internal combustion engine, a frame, a fuel tank for carrying a fuel to be consumed by the internal combustion engine, and a container connected to the internal combustion engine and the fuel tank. The container is configured to store fuel evaporating from the fuel tank, and the container in a position of use is at least partially covered by the fuel tank. The fuel tank is supported pivotably relative to the frame between a maintenance position and the position of use.

Abstract: A motorcycle includes: a front swing arm; a fork holder coupled to the front swing arm in a swingable manner; a front fork steerably supported by the fork holder; and a front cushion unit. In a front-wheel suspension device, one end of the front cushion unit is coupled to the body frame, and the other end of the front cushion unit is coupled to the fork holder.

Abstract: A wheelie controller and a control method thereof or preventing a reduction of acceleration that is more than necessary and reducing a shock during a contact of a front wheel with the ground when a wheelie state is terminated. The wheelie controller for controlling a wheelie of a vehicle body computes a target trajectory, which is a target of a parameter and is used to control the wheelie state of the vehicle body, in accordance with the parameter that is related to pitch of the vehicle body and controls an increase/reduction of the pitch of the vehicle body so as to bring the parameter close to the target trajectory.

Abstract: A straddle vehicle of the present invention includes: a vehicle body frame member; a rotatably supporting member supporting a front wheel; a support arm supporting the rotatably supporting member, the support arm extending rearward from the rotatably supporting member; a pair of upper and lower link members pivotally connected to the support arm at two locations on a rear portion of the support arm at least on one side of the vehicle body in a vehicle width direction, the two locations being spaced in the upward-downward direction, the pair of upper and lower link members extending rearward from the support arm, each of the link members having a rear portion pivotally connected to the vehicle body frame member; a handle; and a handle supporting member removably coupled to the vehicle body frame member and supporting the handle.

Abstract: A seat bench arrangement for a motorcycle is provided, with a tank bearing which is designed for connecting a tank bladder to a vehicle structure, and a seat bench for receiving a motorcyclist. The seat bench is connected to the tank bearing such that the tank bearing forms a bearing for supporting the seat bench.

Abstract: A motorcycle includes: a front swing arm that includes upper arms and lower arms; a fork holder; a front fork; and a front cushion unit. The fork holder of a front-wheel suspension device includes a pair of left and right sideward extended portions which extend in the vehicle width direction. The front ends of the left and right upper arms are attached to the left and right sideward extended portions though connecting shafts, respectively.

Abstract: A motorized vehicle including: a front fork; a steering shaft able to rotate inside a steering column; at least one fork crown coupled to the steering shaft and to the front fork; and at least one electronic component intended to collect and/or transmit data relating to the operation of the motorised vehicle. The fork crown has a body in which there is formed a cavity closed by a cover and an electronic board housed in the cavity and able to centralize and/or process the data supplied by the at least one electronic component.

Abstract: A flexible traction drive mechanism for a motor vehicle transmission includes a first traction mechanism wheel which can be rotationally fixed to a first transmission component, a second traction mechanism wheel which is drivingly connected to the first traction mechanism wheel by a traction mechanism and can be rotationally fixed to a second transmission component, and a bearing journal for supporting the first traction mechanism wheel. The first traction mechanism wheel is arranged so as to be axially movable relative to the bearing journal.

Abstract: A motorcycle intake air guide for feeding an intake air volumetric flow to a motorcycle internal combustion engine includes an unfiltered-air channel, a filtered-air channel, and an air filter therebetween. An intake air guide valve provided in the unfiltered-air channel is configured to change a cross-section of the unfiltered-air channel cross-section. The unfiltered-air channel has a double-flow design at least in sections with a first unfiltered-air partial channel and a second unfiltered-air partial channel which are merged downstream of a steering head of a frame of the motorcycle in a collection region of the unfiltered-air channel. The intake air guide valve is arranged in the collection region, downstream of the first and second unfiltered-air partial channels.

Abstract: A method for laterally stabilizing a single-tracked motor vehicle, driven with the aid of an electric motor, that is in a vertically aligned state and at a standstill. The front wheel of the motor vehicle has a steering angle in which the electric motor is controlled in such a way that it exerts drive torques on the motor vehicle that act in alternation in the forward direction and in the reverse direction.

Abstract: The guard structure for a saddle riding vehicle includes a body frame, a guard member fixed to the body frame and guarding a vehicle body, a stay connecting the guard member to the body frame. The stay includes a frame connection section connected to the body frame side, a guard member connection section connected to the guard member, and a linking section that connect the frame connection section and the guard member connection section. The stay is formed in a U shape by the frame connection section and the guard member connection section, which are disposed to face each other, and the linking section.

Abstract: A suspension assembly including a core member; and a skin member bonded on said core member. The skin member having a higher strength than the core member.

Abstract: A motorcycle footrest that is configured to be operably coupled to a motorcycle and provide an additional footrest member for a rider to place their feet during operation of the motorcycle. The motorcycle footrest of the present invention includes a coupling member wherein the coupling member is undulated in shape having a contiguous upper portion and lower portion. The lower portion has an aperture formed therethrough and is of suitable size to accommodate a footpeg standoff therethrough. The coupling member includes an offset member contiguous therewith. A first arm support member is rotatably secured to the offset member and includes a first end and second end. A second arm support member is secured to the second end of the first arm support member. A footrest member is secured to the second end of the second support arm member.

Abstract: A bicycle radar system including a camera is disclosed. The system may include a radar unit and a bicycle computing device that are in communication with one another. The radar unit may transmit radar signals, receive return signals (reflections), and process the returned radar signals to determine a location and velocity of one or more targets located in a sensor field behind a user's bicycle. The radar unit may also include an integrated camera to selectively provide images or video of an area behind the bicycle in the camera's field of view. The radar unit may analyze the returned radar signals and images and/or video to track the location of targets located behind the bicycle. The bicycle computing device or the radar unit may also selectively activate the camera based upon the satisfaction of particular conditions.

Abstract: A driving mechanism is provided. The driving mechanism connects with a frame and a driving wheel by two ends thereof. The driving mechanism includes a motor housing, a motor assembly and a driving controller. The motor housing supports the frame and defines an inner space. The motor assembly is detachably assembled with the motor housing and located in the inner space. The motor assembly drives the driving wheel. The driving controller is detachably assembled with the motor housing, located in the inner space, and electrically connected with the motor assembly.

Abstract: A method, computer system, and a computer program product for communicating between a bicycle and a vehicle to prevent vehicle open door accidents is provided. The present invention may include determining, by a bicycle device, a bicycle is in a stationary state. The present invention may then include sending, by the bicycle device, a request to a user to confirm that the bicycle is in the stationary state. The present invention may further include receiving, from the user, a response to the sent request, wherein the user confirms that the bicycle is in an active state.

Abstract: A fuel tank includes metal-made upper and lower tank half bodies respectively having, on respective outer peripheries thereof, an upper joint flange and a lower joint flange joined thereto. The lower tank half body includes: a lower tank main body portion that is elongated in a direction parallel to a reference plane including joint surfaces of lower and upper planar flange portions as parts of the lower and upper joint flanges, respectively, includes, along a longitudinal direction thereof, a narrow portion narrower on one side than the other side, and bulges toward a lower side from the reference plane; and a pair of expansion tank portions that are disposed on opposite sides of the narrow portion as seen in a plan view from a direction orthogonal to the reference plane, formed to be shallower than the lower tank main body portion, and bulge downward from the reference plane.

Abstract: A seat assembly for a vehicle having frame, a fender assembly and a longitudinal axis has a first seat pan having a first coupler coupling a first seat to the frame. A cover support is adjacent to the first seat pan. A grab strap is coupled to the first seat pan. A first seat cover is coupled to the first seat pan. A first fastener couples the first seat to the fender assembly. A second seat pan is coupled to the fender assembly with the first fastener. The second seat pan comprising a first opening receiving the grab strap. A second fastener couples the second seat pan to the fender.

Abstract: There is provided a steering shaft modifier, capable of fundamentally preventing distortion generated in a new steering shaft, being easing aligned, and being simply assembled, including: a frame having a steering shaft penetrating portion formed in a front surface thereof and having a contact surface covering a portion of the steering head and disposed to be in contact with an upper bearing installation portion of a steering shaft installation portion; a shaft including a head portion caught by a lower bearing installation portion of the steering shaft installation portion of the steering head, a body portion passing through the steering shaft installation portion, and a connection portion connected to the frame; and a frame block including a lower contact surface tightly attached to a lower surface of the steering head in the rear of the lower bearing installation portion and coupled to the frame when installed.