摘要:
A crank arm for a bicycle includes a crank arm body having a pedal attachment hole on a first end thereof and a spindle attachment hole on a second end thereof. The crank arm body defines an elongated interior cavity, wherein the interior cavity is open to an exterior of the crank arm body. The opening can be used to access the cavity during and after manufacturing. In the method used to form the crank arm body according to the present invention, a sand mold core is positioned into a casting mold so that a melt space is formed around the sand mold core, molten metal is poured into the casting mold, and the molten metal is solidified to form a crank billet. Sand is preferably removed through an opening in the crank billet. This may be accomplished by drilling the crank billet to form the pedal attachment hole in a location that communicates with the sand mold and then removing sand through the pedal attachment hole.
摘要:
A bicycle crank arm assembly for a bicycle which is designed for mounting a sprocket thereto. The crank arm has a centrally located hub portion, a crank portion extending radially outwardly from the hub portion and at least three fastening fingers extending radially outwardly from the hub portion. The fastening fingers are designed to have substantially the same stiffness at their free ends. This can be accomplished in a variety of ways such as change the cross-section of the fastening fingers adjacent the crank portion or changing the shape of the sprocket mounting portions of the fastening fingers. Also, in certain embodiments, the fastening fingers adjacent the crank portion are constructed such that their rear surfaces lie in the same plane as the rear surface of the crank portion adjacent thereto, or in a lower plane.
摘要:
A tool for fixing a chainwheel to a crank arm assembly of the type wherein a crank axle mounting section of a crank arm mounts to an end of a crank axle. The crank axle mounting section includes a threaded outer surface, and a nut is provided for fixing the chainwheel to the crank axle mounting section. The nut includes a plurality of nut splines disposed on an outer peripheral surface thereof and a threaded inner peripheral surface for meshing with the threaded outer surface of the crank axle mounting section. The tool includes a tool-mount member shaped to be held and turned by a second tool, wherein the tool-mount member defines an opening for receiving the crank axle therethrough. An operating member is formed as one-piece with the tool-mount member and has a plurality of splines extending from an inside surface thereof for meshing with the plurality of nut splines. An auxiliary tool having first and second ends has a grip section disposed in close proximity to the first end, wherein the grip section has a diameter greater than or equal to a diameter of an end of the crank axle. A support section adjacent to the grip section has a diameter less than a diameter of the opening of the tool-mount member so that the support section is fitted within the opening.
摘要:
A crank axle includes an axle body having first and second ends, a first rotary linkage member disposed at the first end of the axle body for nonrotatably fitting a first crank arm thereto, and a first centering structure disposed at the first end of the axle body in close proximity to the first rotary linkage member. The rotary linkage member may be formed as a plurality of splines, and the same structure may be formed at the second end.
摘要:
A thermoplastic elastomer composition comprising, as resin components, 100 parts by weight of a crystalline chlorinated polyethylene with a chlorination degree of from 20 to 45% and a heat of crystal fusion of from 5 to 35 cal/g as measured by a DSC method and from 40 to 400 parts by weight of a rubber material having a solubility in tetrahydrofuran at 25.degree. C. of not more than 50% by weight.
摘要:
A bicycle bottom bracket assembly is at least provided with a first support member and a first bearing unit. The first support member includes a first hanger mounting part and a first bearing mounting part. The first bearing unit is coupled to the first bearing mounting part. The first hanger mounting part has a first outer circumferential surface that is configured and arranged to be press-fitted into a first open end of a hanger part of a bicycle frame. The first hanger mounting part has a first slit extending in an axial direction relative to a rotational axis of the first bearing unit from an open axial innermost end of the first slit at least up to a region that is located radially outwardly from the first bearing unit in a radial direction relative to the rotational axis of the first bearing unit.
摘要:
A bicycle crank axle comprises an axle body having first and second end portions, a plurality of first splines disposed at the first end portion of the axle body, a plurality of second splines disposed at the second end portion of the axle body, and a projection extending radially outwardly from the first end portion of the axle body, wherein the projection is structured to abut against a lateral outer surface of a bicycle crank arm to prevent the bicycle crank arm from moving axially outward. A separate projecting member is mounted to the first end of the axle body to form the projection. The plurality of first splines extend radially outwardly from an outer peripheral surface of the axle body for engaging a splined surface of the bicycle crank arm, but the plurality of second splines do not extend radially outwardly relative to the outer peripheral surface of the axle body.
摘要:
An electronic ballast is capable of inhibiting ballast shutdown caused by erroneously determining a fault condition. The ballast includes a DC power supply circuit for outputting DC power, a power conversion circuit that appropriately converts DC power outputted by the DC power supply circuit and outputs it to a discharge lamp, a DC voltage droop detection circuit for determining existence/absence of a fault condition in the DC power supply circuit 1, a lamp end of life detection circuit for determining existence/absence of a fault condition of the discharge lamp; and a sequence control circuit and a shutdown control circuit that control at least the power conversion circuit according to detection by the DC voltage droop detection circuit the discharge lamp life detection circuit. When a fault is determined in both the DC voltage droop detection circuit and the discharge lamp life detection circuit, an operation according to the detection of the DC voltage droop detection circuit, the sequence control circuit lowers the output of the power conversion circuit 2 is performed in priority to an operation that, according to the detection of the discharge lamp life detection circuit, the shutdown control circuit shuts down the power conversion circuit
摘要:
A bicycle axle assembly is provided with an axle including a rotational axis, a bearing, a bearing adapter and a conical element. The bearing includes a cone disposed on the axle, a cup and a plurality of roller elements disposed between the cone and the cup such that the cup rotates relative to the cone about the rotational axis. The bearing adapter includes a tubular mounting section for mounting to a tubular member and a bearing housing section housing the bearing therein. The bearing housing section has a tapered abutment angled relative to the rotational axis at a first abutment angle and contacting a tapered contact surface of the cup. The conical element is disposed on the axle. The conical element has a tapered abutment angled relative to the rotational axis at a second abutment angle and contacting a tapered contact surface of the first cone. The second abutment angle of the tapered abutment of the conical element is smaller than the first abutment angle of the bearing housing section.
摘要:
An inverter controller dives an inverter to operate at a switching frequency selectively from one of a preheating frequency (f1), a starting frequency (f2), and a lighting frequency (f3) which are different from each other, thereby giving a preheating mode, a starting mode, and a lighting mode. A reset means is provided to make the starting mode upon lowering of a voltage supplied to the inverter below a first threshold, while an inverter stop means is provided to stop the inverter upon detection of abnormality of a discharge lamp. A timer generates a signal determining the start of the preheating, starting, and/or lighting modes, and generates a reset signal disable signal for disabling the reset means, an inverter stop disable signal for disabling the inverter stop means. The inverter controller includes a frequency sweep means for varying the switching frequency gradually from the starting frequency to the lighting frequency. The timer disables the reset means only during a period starting from the selection of the preheating frequency and ending when the switching frequency varies to the lighting frequency, and disable the inverter stop means only during a period starting from the selection of the preheating frequency and ending when the switching frequency begins to vary from the starting frequency to the lighting frequency.