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: An intake duct structure of a motorcycle includes front forks disposed on both of right and left sides of a head pipe of a body frame and a main frame extending obliquely backward and downward from the head pipe, wherein the intake duct structure extends from a front end of the motorcycle toward the head pipe and is formed in such a manner that an interfered area where a rotational orbit of the front forks at a time of steering overlaps the intake duct structure is elastically deformable.

Abstract: A method is described for influencing the engine control of a single-track motor vehicle, in which the current driving situation is ascertained, a predefined driving situation is selected from a specified class of predefined driving situations as a function of the current driving situation, and the engine control is influenced as a function of the selected predefined driving situation in a manner that is independent of the driver.

Abstract: An ABS disposition structure of a saddle riding vehicle includes a head pipe, a main frame, a pair of left and right center frames extending downward from a rear section of the main frame and having a pivot section by which a front end portion of a swing arm is pivotably supported, a cushion disposed at a center in a vehicle width direction, and an ABS modulator configured to perform ABS control, wherein, when seen in a side view, a central axis of the cushion is disposed to be offset from a center frame in a forward and rearward direction, and the ABS modulator is disposed between the cushion and the center frame in a vehicle width direction.

Abstract: A method for generating a sectional view of a body of a vehicle includes displaying a first sectional view of the vehicle body on a screen, where the first sectional view comprises two surfaces of two components of the vehicle body which adjoin one another at a first transition point. The method includes displaying a joint catalog with a plurality of predefined joint types, where one joint type of the plurality of predefined joint types defines a predefined joint section for a joint between two surfaces. The method also includes detecting a selection of a first joint type from the joint catalog, and automatically inserting the predefined joint section for the first joint type at the first transition point into the first sectional view displayed on the screen, with the result that the surfaces of the two components are connected to one another at the first transition point by the joint section.

Abstract: A body frame of a two-wheeled motor vehicle includes a first frame extending rearward from a head pipe, a second frame disposed beneath the first frame with a gap there between, a third frame disposed beneath the second frame with a gap there between, a plate-shaped first reinforcing member provided between the first frame and the second frame, and a plate-shaped second reinforcing member provided between the second frame and the third frame, and the first reinforcing member and the second reinforcing member are formed so that external shapes thereof are connected. Thus, it is possible to provide a body frame for a two-wheeled motor vehicle that contributes to cutting the number of components and increasing the stiffness.

Abstract: A luggage container for fastening to a vehicle, particularly to a motorcycle, including a first locking device which can adopt a release position in which the luggage container can be opened, and a locking position, in which an opening of the luggage container is locked. The luggage container has a second locking device which can adopt a locking position, in which an opening of the luggage container can be locked even if the first locking device is in its release position.

Abstract: A swing arm for a saddle riding vehicle which includes a pivot section connected to a vehicle body, and a wheel support section configured to support a rear wheel and which is capable of swinging around the pivot section, includes a swing arm main body made of a fiber reinforced resin, in which the swing arm main body includes a pivot-side opening configured to open an end on a side of the pivot section, and a rear end opening configured to open an end on a side of the wheel support section, and is formed in a hollow shape continuous from the pivot-side opening to the rear end opening.

Abstract: A motorcycle comprises a vehicle body frame including a head pipe part, a pair of right and left main frame parts extending rearward from the head pipe part while being inclined in a downward direction, a down frame part extending downward from the head pipe part to a location that is below the main frame parts, and a bridge frame part coupling the main frame parts to the down frame part; a fuel tank supported by the main frame parts; and a canister connected to the fuel tank via an inlet tube and configured to store therein evaporated fuel generated in the fuel tank. The canister is disposed on a first side in a vehicle width direction. In a side view, the canister is disposed in a region surrounded by the main frame part, the down frame part, and the bridge frame part.

Abstract: An arrangement structure of an exhaust gas sensor includes an exhaust pipe that extends from an engine for a vehicle to form a part of an exhaust flow path, a catalytic device that purifies exhaust gas flowing through the exhaust flow path, and a first exhaust gas sensor that detects a predetermined component in the exhaust gas. The exhaust pipe is led out from a front side of the engine to one side in a left-right direction of the engine, and extends rearward so as to be routed on a lateral side of the engine. The catalytic device is arranged in the middle of the exhaust pipe on the lateral side of the engine. The first exhaust gas sensor is arranged on the lateral side of the engine and on an upstream side or a downstream side of the catalytic device in the exhaust pipe.

Abstract: A brake lever, including a protective casing, a fixing assembly cooperatively fixing the protective casing, a connecting member for connecting a hand brake cable, and a hand brake assembly; the hand brake assembly includes a main arm with one end rotatably connected to the protective casing, and the other end rotatably connected to a handle; the main arm is driven to rotate by applying a force to the handle, the connecting member is driven by a transmission member to move in the direction of tightening the hand brake cable when the main arm rotates; the handle is provided with an auxiliary supporting arm, and two ends of the auxiliary supporting arm are rotatably connected to the protective casing and the handle.

Abstract: A utility vehicle of the present invention comprises a chassis; and a R.O.P.S. provided on the chassis and surrounding a cabin, wherein the R.O.P.S. includes a pair of left and right front pillars, a pair of left and right side beams, a pair of left and right rear pillars, and a front beam and a rear beam which extend in a width direction of a vehicle body, a rear support supporting the R.O.P.S. from a rear is connected to a rear portion of the chassis, and a rear end of the side beam, a side end of the rear beam, an upper end of the rear pillar, and a front end of the rear support are connected by a connecting portion.

Abstract: A suspension system for a vehicle having a frame with a medial plane and a wheel defining a central plane. The suspension system comprises a wheel carrier rotatably connectable with the wheel and operably connected to the handle bar assembly for transferring steering motion from the handle bar assembly to the wheel, a steering shaft configured to transmit steering motion from the handle bar assembly to the wheel carrier, a plurality of locating arms, each of the plurality of locating arms having a forward end and a rearward end, a forward ball joint connecting the forward end of each of the plurality of locating arms with the wheel carrier and a rearward ball joint connecting the rearward end of each of the plurality of locating arms with the frame.

Abstract: There is provided a motorcycle. A crankshaft extends in a width direction of the motorcycle. A counter shaft is arranged in parallel with the crankshaft. A clutch mechanism is arranged at one end of the counter shaft and is configured to transmit and disconnect rotation of the crankshaft to and from the counter shaft. A clutch actuator is configured to perform a disconnection/connection operation of the clutch mechanism. A shift mechanism is arranged below the counter shaft and is configured to shift and transmit the rotation of the crankshaft to a driving wheel. A shift actuator is configured to perform a shift operation of the shift mechanism. The shift actuator is arranged opposite to the shift mechanism in a front and rear direction of the motorcycle with the clutch actuator being interposed therebetween.

Abstract: A foot peg assembly for a motorcycle includes a mounting assembly including a mounting flange having an outer wall with a substantially planar front face and a lower surface extending from the outer wall. A mounting plate is configured to be coupled to the mounting flange to secure the mounting assembly to the motorcycle. An arm includes an elongated body extending from a first end coupled to the outer wall of the mounting assembly to a second end. A peg is coupled to the second end of the arm.

Abstract: A saddle riding vehicle includes: a pair of left and right seat rails disposed below a seat for a passenger; a battery disposed below the seat; and an ECU for controlling a drive source of the vehicle, wherein when viewed from above, the battery and the electronic control unit are arranged side by side in a vehicle width direction between the left and right seat rails.

Abstract: In an intake device, an upper fuel injection device that injects a fuel and a suction port that suctions the air-fuel mixture supplied to a cylinder head are disposed in the air cleaner. The intake device includes the air cleaner including an air cleaner case and a sidewall filter that purifies an air suctioned into the air cleaner case. The sidewall filter partitions a space in the air cleaner case in a vehicle width direction, and has at least partially overlapping with the upper fuel injection device in the vehicle width direction.

Abstract: A bike having an automatic landing wheel apparatus includes a left landing wheel arm on the left side of the bike to vertically move a left landing wheel rotatably coupled to the lower end portion thereof. A right landing wheel arm on the right side of the bike vertically moves a right landing wheel rotatably coupled to the lower end portion thereof. A left driving unit drives the left landing wheel arm to move the left landing wheel upward and downward. A right driving unit drives the right landing wheel arm to move the right landing wheel upward and downward. A speed detection unit detects the speed of the bike. A controller is connected with the speed detection unit, the left driving unit, and the right driving unit to move the left and right landing wheels upward or downward in response to the detected speed of the bike.

Abstract: Provided is a motorcycle including side cowls configured to cover a part of a vehicle body frame from sides, wherein each of the side cowls includes: an inner cowl, an outer cowl configured to cover the inner cowl from an outside in a vehicle width direction to form an air guide path configured to guide traveling air from a front side to a rear side between the inner cowl and the outer cowl, and an air flow conditioning member configured to generate downforce using traveling air directed from the inner cowl to an inner surface of the outer cowl in the vehicle width direction and flowing through the air guide path, and the air flow conditioning member is separated from the inner surface of the outer cowl in the vehicle width direction.

Abstract: A cylinder head of an internal combustion engine includes a cylinder head main body which is formed with a main body side plug insertion hole into which an ignition plug is inserted, a cam holder which is fixed to the cylinder head main body and forms cam bearing portions together with the cylinder head main body, wherein the cam bearing portions rotatably support an intake camshaft and an exhaust camshaft, respectively, and wherein the cam holder is formed with a holder side plug insertion hole which communicates with the main body side plug insertion hole and into which the ignition plug is inserted, and a knock pin which is disposed across the main body side plug insertion hole and the holder side plug insertion hole to restrict assembly positions of the cam holder and the cylinder head main body.

Abstract: In a vehicle engine transmission apparatus, a shift spindle sensor is mounted in and extends through a through spindle sensor mount hole defined in a spindle sensor mount seat formed on a portion of a case, and a shift drum sensor is mounted in and extends through a through drum sensor mount hole defined in a drum sensor mount seat formed on a portion of the case. The direction in which the shift spindle sensor is mounted and the direction in which the shift drum sensor is mounted are same as each other. The shift spindle sensor and the shift drum sensor can be easily attached to and detached from their mount seats and can be well serviced for excellent maintainability, and the mount seats can be machined with ease and excellent machinability.

Abstract: A personal transport vehicle capable of staying upright without the need for a stand by incorporating tires having an advantageous design combined with an overall lowered center of gravity. The personal transport vehicle further incorporating a hub and steering assembly configured within the front wheel of the vehicle, as well as a brake and propulsion means configured within the rear wheel of the vehicle. Finally, the personal transport vehicle is capable of being folded into a compact configuration, lending itself to ease of shipment, storage and transport.

Abstract: A saddle riding vehicle includes: a pair of left and right seat rails disposed below a seat for a passenger; a battery disposed below the seat; and a regulator connected to the battery. In the saddle riding vehicle, when viewed from above, the battery and the regulator are arranged in a longitudinally aligned state between the left and right seat rails, the regulator and the battery are disposed such that the regulator is disposed below an upper surface of the battery in order to form a stepped portion, and an intake duct of an intake device is disposed in a space formed above the regulator by the stepped portion.

Abstract: A motorcycle intake air guide for guiding an intake air volumetric flow from a front region of a motorcycle to a motorcycle internal combustion engine includes a front air guiding duct, a rear air guiding duct arranged downstream of the front air guiding duct, and a steering head bypass region arranged between and connecting the front and the rear air guiding ducts to one another. The front and the rear air guiding ducts have a closed profile. The steering head bypass region preferably has, in a steering head cross-sectional plane which is arranged orthogonally with respect to a main flow direction of the intake air volumetric flow in the steering head bypass region, a non-closed profile for guiding the intake air volumetric flow around a steering head recess through which a steering head of the motorcycle extends. The steering head may close the non-closed profile at the steering head recess.

Abstract: To provide a vehicle body cover structure for a saddled vehicle, capable of achieving restrictive improvements on rigidity of the vehicle body cover. A vehicle body cover structure for a saddled vehicle includes a radiator shroud formed of a fiber-reinforced resin covering an outside of a vehicle body. The fiber-reinforced resin is formed of a cloth woven from warp threads and filling threads formed of fibers. In the vehicle body cover structure, the radiator shroud has the cloth disposed thereon. The cloth has disposed thereon a bisector that divides an angle formed between the warp threads and the filling threads into two equal parts. The bisector is disposed so as to extend along a line segment that connects between a third mounting portion to be fixed to a vehicle body side and a front end portion that is farthest from the third mounting portion.

Abstract: A saddle-type vehicle includes a vehicle body frame including a main frame extending obliquely rearward and downward from a head pipe, a down frame extending downward from the head pipe and supporting an engine, and a seat frame extending rearward from the main frame and supporting a riding seat, wherein a front wheel is supported by a front portion of the vehicle body frame via a front fork, and a rear wheel is supported by a rear portion of the vehicle body frame via a swing arm, and a vehicle height adjustment device provided below the seat frame to elastically support the seat frame and configured to adjust a height of the seat frame. The vehicle height adjustment device includes an actuator unit and a cushion unit. The actuator unit is disposed between the cushion unit and the engine.

Abstract: A brake fluid pressure control device for vehicles with bar handle, includes: an acceleration acquiring unit which is configured to acquire acceleration that occurs in the vehicle; and a control unit which is configured to judge a probability of occurrence of a rear-wheel lift based on the acceleration acquired by the acceleration acquiring unit, and which is configured to perform a pressure reduction control on a front wheel brake when judging that the occurrence of the rear-wheel lift is probable, the control unit which is configured to adjust a degree of pressure reduction of the pressure reduction control based on a differentiation value of the acceleration acquired by the acceleration acquiring unit.

Abstract: An all terrain vehicle includes: an internal combustion engine; a fuel tank; a body frame on which to mount the engine and tank; at least three wheels suspended at the frame and including at least paired left and right wheels; and a canister adsorbing evaporated fuel in the tank. Part of a body cover includes: a vertical wall extending up-down while covering a specified wheel from one of front and rear sides; an upper wall covering the specified wheel from above, extending forward and rearward, and spaced toward an other of the front and rear sides from the vertical wall; and a connection wall inclined while interconnecting an end portion on the vertical wall side of the upper wall and an upper end of the vertical wall. An accommodation space triangular in side view is formed between the connection wall and specified wheel. The canister is disposed in the space.

Abstract: An exhaust pipe structure for an in-line four-cylinder internal combustion engine includes: an in-line four-cylinder internal combustion engine; four exhaust pipes connected with respective exhaust ports in respective cylinders of the internal combustion engine; and a converging exhaust pipe connected with a converging portion at which downstream ends of all the exhaust pipes converge. In this exhaust pipe structure, the exhaust pipes are each configured as a dual pipe including an outer pipe and an inner pipe disposed inside the outer pipe. At the converging portion, the four exhaust pipes are arrayed linearly in parallel with each other, and the outer pipes of adjacent ones of the exhaust pipes are directly welded with each other at the downstream ends.

Abstract: Methods and apparatus for controlling the ramp in of current to an electronic power assisted steering motor associated with an auto stop-start engine are described. A controller is to determine a moving average voltage of a vehicle battery. The controller is also to determine a voltage rate of change based on the moving average voltage. The controller is also to determine a moving average engine speed of an auto stop-start engine of the vehicle. The controller is also to ramp in current to an electronic power assisted steering motor of the vehicle based on the moving average voltage, the voltage rate of change, and the moving average engine speed.

Abstract: A method for lateral dynamic stabilization of a single-track motor vehicle during cornering; on the left side of the vehicle, the motor vehicle including at least one first nozzle, which is mounted at a first position located between the wheels, and through which a medium situated in a first container may escape into the surroundings of the motor vehicle, with a speed component pointed in the outer direction of the left side of the vehicle; and on the right side of the vehicle, the motor vehicle including at least one second nozzle, which is mounted at a second position located between the wheels, and through which a medium situated in a second container may escape into the surroundings of the motor vehicle, with a speed component pointed in the outer direction of the right side of the vehicle; —where a presence of an unstable driving condition in a lateral direction of the vehicle is detected, and—as a function of this, with the aid of an actuator system, on only one side of the vehicle, the medium is caused

Abstract: The adjustable toe peg allows a rider to adjust the toe peg position in two ways. First, the lever to which the toe peg attaches preferably includes a series of holes, about which the toe peg apparatus will rotate. Second, by placing the toe peg on a rotating member, which is held by a clamping force, the toe peg can be positioned at any angle.

Abstract: A non-backdrivable passive balancing system for a single-axle dynamically balanced robotic device includes a body that includes a distal end and a proximal end, a controller module, and an actuator communicatively coupled to the controller module of the single-axle dynamically balanced robotic device. The actuator receives an engagement signal from the controller module, the engagement signal corresponding to an indication that the dynamically balanced robotic device is stationary, and the actuator causes the linkage to move the body from a disengaged position to an engaged position such that the distal end of the body contacts a ground surface and supports the dynamically balanced robotic device in a substantially upright position.

Abstract: There is provided a motorcycle. A crankshaft extends in a width direction of the motorcycle. An engine case pivotally supports the crankshaft. A counter shaft is arranged in parallel with the crankshaft. A clutch mechanism is arranged at one end of the counter shaft and configured to transmit and disconnect rotation of the crankshaft to and from the counter shaft. A clutch actuator performs a disconnection/connection operation of the clutch mechanism. A shift mechanism is arranged below the counter shaft and configured to shift and transmit the rotation of the crankshaft to a driving wheel. A shift actuator performs a shift operation of the shift mechanism. A generator is arranged at one end of the crankshaft. The clutch actuator and the shift actuator are arranged around a cover member mounted to the engine case and accommodating therein the clutch mechanism or the generator.

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.