This invention relates to bicycles. In particular the invention relates to a crank arm and chainring carrier assembly.
The crankset is the component of a bicycle drivetrain that converts the pedaling motion of the rider's legs into rotational motion used to drive a chain or belt, which in turn drives a rear wheel of the bicycle. The crankset typically carries one or more chainrings or chainwheels attached to one of the two crank arms of the crankset—commonly the right-side crank arm—either directly or through a chainring carrier. The crankset is connected to the rider by pedals attached to the crank arms, to the bicycle frame by a bottom bracket and axle, and to a rear sprocket, cassette or
The chainring or chainrings are typically attached to the right-side crank arm of the crankset and supported by a chainring carrier. In one such example, the chainring carrier may be separate from the drive-side crank arm. Other chainring carriers are integral to the drive-side crank arm. Separate, detachable chainring carriers enable a wide variety of chainring patterns to be used with the same crank arm.
A category of power meters are used on bicycles by integration into a chainring carrier, such as those designed and manufactured by Quarq®. The chainring carrier power meter includes strain gages and electronics to measure the torque applied thereto and when combined with angular velocity, power can be calculated. Chainring carrier-based power meters are typically assembled to a crank arm in the same fashion as non-power meter chainring carriers, via a press or interference fit. While connection of these chainring carriers to the crank arm is largely via the press fit of chainring carrier to crank arm via interconnected splines or the like, the connection may be supplemented by screws, although the screws do not function to any significant extent in transmitting torque from one part to another. These press fit connections convey most or all of the torque from the crank arms to the chainring carrier through the splined connection of crank arm and chainring carrier.
When attaching a chainring carrier to a crank arm the connection between the chainring carrier and crank arm should provide for quick and simple installation and result in a reliable connection. When the chainring carrier includes power meter elements, the connection should also take into consideration the transfer of torque from the crank arms to the chainring carrier such that accurate torque measurements can be made by the power meter.
There is a demand, therefore, to provide a bicycle with an effective crank arm and chainring carrier assembly. The invention satisfies the demand.
The invention provides, in one aspect, a crank arm and chainring carrier assembly. The assembly includes a crank arm. A chainring carrier is sized and shaped to connect to the crank arm. A first pairing feature is formed on one of the crank arm and the chainring carrier and a second pairing feature is formed on the other of the crank arm and the chainring carrier to position the chainring carrier on the crank arm. A clearance is defined between the first and second pairing features when the first and second pairing features are paired. A torque-transmitting coupling is formed on the crank arm and the chainring carrier configured to transmit substantially all of the torque applied to the chainring carrier from the crank arm.
Other aspects of the invention provide an assembly wherein the chainring carrier may include power meter elements. The chainring carrier may be a spider including a plurality of arms and wherein at least some of the power meter elements are disposed on the plurality of arms to sense strain. The clearance may substantially inhibit torque transfer between the first and second pairing features. The torque-transmitting coupling may provide a substantially uniform load introduction between the chainring carrier and the crank arm. The assembly may include a planar seat on the crank arm. The chainring carrier may be shaped and sized to abut the seat. The seat may include a plurality of crank arm holes formed therein. The plurality of crank arm holes may number at least eight. At least some of the plurality of crank arm holes may be substantially centered on a bore circle diameter. The plurality of crank arm holes may be substantially centered on the bore circle diameter. The plurality of crank arm holes may be distributed substantially evenly about the bore circle diameter. The chainring carrier may include a plurality of chainring carrier holes, at least two of the chainring carrier holes including an angled section; and a plurality of fasteners, at least two of the plurality of fasteners having an alignment feature formed thereon to cooperate with the corresponding angled section of the chainring carrier holes to align and connect the chainring carrier on the crank arm to form the torque-transmitting coupling and to maintain the clearance between the first and second pairing features. The angled section may be formed about midway along each of the plurality of carrier holes. The fasteners may include a head portion and a threaded portion formed on opposite sides of the alignment feature. A least two of the carrier holes includes a straight-sided first section and a straight-sided second section flanking the angled section, the first section being wider than the second section. The alignment features and the angled sections may both be tapered and wherein each forms an angle of about 90 degrees. The clearance may substantially avoid a redundant load transfer between the carrier and the crank arm through the first and second pairing features. The first pairing feature may be a portion of the interface. The first pairing feature may include a post portion formed radially inward of the seat. The interface may include a socket sized and shaped to receive a spindle. The socket may at least be in part defined by an interior profile of the post. The post portion may extend axially from the crank arm. The second pairing feature may include interior profile formed on the chainring carrier. The post portion may include an exterior profile. The interior profile of the chainring carrier may be sized and shaped to be arranged in a predetermined rotational position on the exterior profile of the post portion and the clearance may be defined therebetween when the chainring carrier is paired to the crank arm. The exterior profile may be substantially parallel to the interior chainring carrier profile. The exterior profile may include lobes. A majority of the lobes may extend radially to or past a bore circle diameter. The exterior profile of the post may include a key that positions the chainring carrier on the crank arm in the predetermined rotational position. The key may be a protrusion of the post that extends radially short of the bore circle diameter. The chainring carrier may be configured to attach to two or more chainrings.
Another aspect of the invention provides a crank arm and chainring carrier assembly, including a crank arm having a plurality of crank arm holes formed therein. A chainring carrier has a plurality of carrier holes formed therein. At least two of the plurality of carrier holes is formed with an angled section. A first pairing feature is formed on one of the crank arm and the chainring carrier and a second pairing feature is formed on the other of the crank arm and the chainring carrier to position the chainring carrier on the crank arm. A clearance is defined between the first and second pairing features when the first and second pairing features are paired. A plurality of fasteners is provided and at least two of the plurality of fasteners has an alignment feature formed thereon to cooperate with the corresponding angled section of the chainring carrier holes to align and connect the chainring carrier on the crank arm to form a torque-transmitting coupling of the crank arm and the chainring carrier and to maintain the clearance between the first and second pairing features.
In another aspect, a bicycle chainring structure is provided. The chainring structure includes a plurality of teeth disposed about the radially outer circumference of the chainring structure and a pairing feature including a wall forming a radially interior profile formed on the chainring structure, the radially interior profile defined by lobes extending radially inward. The chainring structure also includes a torque-transmitting coupling formed in the chainring structure, the torque-transmitting coupling including a plurality of chainring holes disposed in the radially inward extending lobes and configured to receive input torque from a crank arm and transmit the input torque to the plurality of teeth
These and other features and advantages of the present invention will be more fully understood from the following description of one or more embodiments of the invention, taken together with the accompanying drawings.
In the drawings:
Referring to
The elongated crank arm 22 has a distal end portion 28 with a threaded hole 29 that is shaped and sized for receiving a pedal (not shown) as is well known in the art. The crank arm 22 has a proximal end portion 30 that connects to the chainring carrier 24. The proximal end portion 30 may include an insert 32, which is used in composite crank arms. The proximal end portion 30 may also be a portion of the crank arm 22 formed as a one-piece or multiple piece crank arm made of metal, for example.
The crank arm 22 has a planar seat or shoulder 33 formed on the crank arm or fixedly connected to the proximal portion 30 of the crank arm against which the chainring carrier 24 abuts and is kept flush against when the chainring carrier is mounted to the crank arm in a location fit, i.e., wherein mechanical sizes of mating parts are such that, when assembled, the parts are positioned, as desired, in relation to each other.
The crank arm 22 may have a socket 34 that is configured to receive a bottom bracket spindle or axle 25 in a well-known manner, for example, via an interference fit. The crank arm 22 includes a first pairing feature 100A. The first pairing feature 100A may be included on a post portion 35 of the crank arm 22, the post portion extending axially A from the seat 33.
In one example, the socket 34 is configured to receive a tapered eight-lobe spline as provided on a commercially available BB30-type bottom bracket spindle 25 (
The seat 33 includes a plurality of threaded crank arm holes 40, formed therein, for receiving fasteners. Some of all of the crank arm holes 40 may be formed about and/or spaced evenly along a predetermined bolt or bore circle diameter “BCD” about the post portion 35 or not along the BDC.
The radially exterior wall of the post portion 35 defines an exterior profile 42. The exterior profile 42 of the post portion 35 may be configured to roughly parallel the interior profile 38 or it may be configured as a different profile. The exterior profile 42 is one embodiment of the first pairing feature 100A.
In one example, the exterior profile 42 includes a plurality of lobes 44 that extend radially and between the crank arm holes 40. At least some of the lobes 44 extend outwardly to a radial distance near or past the bore circle diameter BCD. Some of the lobes 44 may extend radially a distance less than the bore circle diameter BCD. The lobes may be rounded or tooth shaped or other suitable shapes. One or more of the lobes 44 may have a different shape and/or size than the other lobes to function as a key 64 with a corresponding negative feature on the chainring carrier 24 such that the chainring carrier is oriented in a desired predetermined manner on the crank arm 22.
Referring to
The chainring carrier 24 includes a second pairing feature 100B. The second pairing feature 100B is defined by an interior chainring carrier profile 50 that may be generally parallel to the exterior profile 42 of the post 35 to provide a location fit with the first pairing feature 100B. The interior chainring carrier profile 50 may be sized and shaped to provide a clearance 104 between the interior chainring carrier profile and the exterior profile 42. The clearance 104 may be about 0.3 millimeters. Under normal riding conditions, the clearance 104 is maintained by the assembly 20. In other words, torque is not transferred through the first and second pairing features 100A, B, i.e., directly from the exterior profile 42 to the carrier profile 50, when typical forces of the magnitude generated by pedaling and riding are applied to the crank arm 22, because the clearance is maintained therebetween. For purposes of the present invention, the cooperative combination of the interior chainring carrier profile 50 and the exterior profile 42 of the post 35 may be considered first and second pairing features 100A, B.
The chainring carrier 24 may be constructed to provide for power meter elements. For example, the chainring carrier 24 may be provided with a plurality of arms 52 and strain gages 54 may be arranged on the arms or like features, as known in the art. It will be understood that the strain gages 54 are connected to circuitry (not shown) to generate power information, which may be transmitted to a suitable head unit/readout (not shown), as is known in the art.
As shown in
Turning to
It is believed that if the chainring carrier 24 shifts on the crank arm 22 resulting in contact between the exterior profile 42 of the interface 32 and the interior chainring carrier profile 50, a condition known as “clocking”, that an offset shift in power meter response can result. It is believed that clocking can result in less accurate power measurement in the chainring carrier. If the carrier 24 is not a power meter, the avoidance of clocking may not be as important. Thus, it is believed that it is advantageous that all of the torque from the crank arm 22 to the chainring carrier 24 is transmitted solely through a torque-transmitting coupling 102, i.e., the mounting of the chainring carrier 24 on the crank arm 22 by the fasteners 56, and no torque is transmitted from the first and second pairing features 100A, B, e.g., the exterior profile 42 to the interior chainring carrier profile 50. A further advantage of the crank arm assembly 20 according to the invention is that dimensional tolerances between the chainring carrier 24 and crank arm 22 need not be as tight as an assembly that is designed for an interference fit or a slip fit.
While this invention has been described by reference to a particular embodiment, it should be understood that numerous changes could be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the disclosed embodiment, but that it have the full scope permitted by the language of the following claims.
This application is a continuation of U.S. patent application Ser. No. 14/038,364, filed Sep. 26, 2013, the contents of which are herein included by reference in their entirety.
Number | Date | Country | |
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Parent | 14038364 | Sep 2013 | US |
Child | 16423961 | US |