JPS63130962A - Split type sprocket wheel made of polymer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a split polymer sprocket wheel for use with rotary power and idler shafts that are virtually inaccessible due to weight and/or working environment. In particular, the present invention relates to improvements in the materials and attachment means of split sprocket wheels used in chain drive systems in substantially immersed or other corrosive environment applications.

One example of an immersive or corrosive environment application where split sprocket wheels are used is a chain drive system used to move multiple sludge collection vanes in a circuit around a wastewater settling tank.

Traditional settling tanks used hard metal sprockets and chains that decayed fairly quickly in corrosive wastewater. Later, metal sprockets were manufactured in pieces to make them easier to replace, without having to remove the entire shaft from the tank, which was previously necessary, or use heavy equipment, which was costly and time-consuming. became.

In recent years, efforts have been made to eliminate corrosion problems, and metal chains have been replaced with polymeric chains made from glass-filled polyester, acetal resin, or other plastics. This method of replacing materials involves much more than simply replacing metal with plastic. Displacement chains of polymers have the ability to withstand significant loads due to the combined weight of vanes, trapped sludge, and scum, tensile and compressive stresses, and the drag forces inherent in systems operating in liquid-filled tanks. Must be. Accordingly, significant development time has been spent on new compounds that can adequately replace metals in chain applications.

Efforts have also been focused on producing suitable polymeric replacements for drive and idler sprockets. However, difficult problems have been encountered because the ideal material must be sufficiently strong but not so brittle that it easily cracks, nor so soft that it easily deforms. Even materials that meet strength requirements often become deformed when excessive torque is applied to a localized area when installing a sprocket onto a shaft. An example is a set screw used to secure a sprocket hub to a shaft. Tightening the set screw pulls the polymer hub out of circular shape, reducing the total hub/shaft contact and making the attachment of the sprocket wheel to the shaft unreliable.

1. Therefore, it is possible to withstand the load stress caused when pulling the sludge collection vane chain in a tank filled with wastewater, while at the same time disassembling and disassembling it on site without the need for removal of the main shaft. There is a need for a corrosion-resistant, polymeric split sprocket wheel for a wastewater settling tank that is replaceable.It also provides reliable traction on the shaft while providing pressure that does not deform the sprocket wheel. There is also a need for a system that securely attaches a polymeric sprocket wheel to a main shaft in a manner that secures the joint.

It is therefore a principal object of the present invention to provide a polymeric split sprocket wheel that can withstand significant loading stresses such as those encountered in wastewater treatment settling tanks.

Another object of the present invention is to provide a polymeric split sprocket wheel that can be disassembled in the field without requiring removal of the propeller or idler shaft.

A further object of the present invention is to provide a means for attaching a split polymer sprocket wheel which effectively secures the sprocket wheel joint together without causing deformation of the sprocket wheel.

Yet another object of the present invention is to provide a means for attaching a split polymer sprocket wheel that effectively secures the sprocket wheel connection to the rotating shaft without causing deformation of the sprocket wheel.

The present invention discloses a polymer molded sprocket transport and its attachment means suitable for use primarily in wastewater treatment equipment such as settling tanks using chain drive systems. Although non-corrosion properties were well known in the field from the use of steel parts that have strong stiffness but are exposed to corrosive components in wastewater, it was not until very recently that a satisfactory compound that combines stiffness and elasticity was found. Gradually, there is a shift towards the use of previously unavailable polymer parts.

The split sprocket transport of the present invention is removable to a relatively immobile but rotatable rigid shaft, but eliminates torque loss due to loose fits or localized sprocket wheel loss due to extremely tight attachment means. It is mounted with sufficient strength to withstand the loading forces generated by the sludge collection vane chain drive without deformation.

That is, the polymer molded sprocket wheel of the present invention has two mating parts that form a two-sided sprocket when joined, a split line along the joining surface of these mating parts, and a plurality of radial directions. It has protruding sprocket teeth and an axially extending chain support.

The sprocket wheel of the present invention further includes a hub portion with an axial bore having an inner locking slot-like keyway and a laterally extending axial hub shoulder, and a side wall portion with a plurality of tapered recesses. There is.

The sprocket wheel of the present invention includes an internal locking slotted keyway that engages a rigid key and/or a clamping means that is capable of applying a uniform force along the entire circumference of the axially extending hub shoulder; They are secured together and securely but replaceably attached to the shaft by a composite mechanism that includes a tightening means that engages a tapered recess to hold the sprocket ring together around the sprocket wheel.

The structure of the invention and its many attendant objects and advantages will become apparent from the following description taken in conjunction with the accompanying drawings.

Big Flag ■ Referring now to the figures in which identical or corresponding parts are designated by the same reference numerals, FIG. 1 shows a primary settling tank 10, typically formed of reinforced concrete. Tank 10 includes a bottom 12, a pair of opposing side walls 14, an inlet end wall 16, and an outlet end wall 18. A conduit 20 extends through the inlet end wall 16 and conveys wastewater into the tank 10. A panfur 22 crosses between the side walls 14 at the top of the tank 10 and extends downwardly in front of and slightly below the conduit 20 to minimize turbulence in the incoming flow. The wastewater flows steadily from the inlet end wall 16 to the outlet end wall 18 through the settling tank lO.

One or more box-like troughs 24 located near the outlet end wall 18 provide lateral channels for the flow of liquid exiting the settling tank 10.

As the wastewater flows through the settling tank, settleable solids or sludge descends to the bottom 12 and floatable waste or scum rises to the surface of the wastewater.

To facilitate the removal of floating and settled waste,
A collection mechanism is located within the tank 10. The collection mechanism includes a pair of endless chains 26, preferably made of a polymeric material, each endless chain positioned adjacent each of the side walls 14. Although the endless chain 26 preferably serves as a carrier for the lateral collection vanes 28, other flexible drive elements may be used instead.

The endless chains 26 are mutually parallel and run around a plurality of sprockets 30, 32, 34, 36, all of which have teeth for engaging the chain. Each pair of sprockets 30° 32, 34.
36 are respectively attached to laterally extending shafts 38, and both ends of the shafts 38 are rotatably attached to bearings 40 (see FIG. 2). Bearing 4 for each shaft
0 are fixed to the side walls 14, respectively. The shaft 39 for the pair of sprockets 30 has a drive sprocket 42 fixed thereto, the drive sprocket 42 being connected to a support 48
It engages a drive chain 44 extending downwardly from a power drive 46 mounted above. That is, the pair of sprockets 30 drives both endless chains 26. The other pair of sprockets and shafts engage with the endless chain,
By limiting their paths, the movement of the chains within the tank 10 is guided.

A plurality of laterally extending collection vanes 28 are secured to the endless chain 26 at predetermined spaced locations by attachment links 50 that are part of the endless chain 26 .

Embedded in the bottom 12 of the tank 10 is a pair of generally parallel rails 52 extending longitudinally of the tank 10 and extending slightly upwardly from the bottom 12 thereof, and collecting vanes 28 are installed in the bottom 12 of the tank 10.
provides a trajectory for the collecting vanes 28 when collecting the settled sludge moving from the outflow end wall 18 side to the inflow end wall 16 side along the bottom 12 of the sludge.

A baffle 54 is located upstream of the outlet end wall 18 of the tank 10 .
and prevents floatable waste from flowing further downstream. Also, on the upstream side of Puffful 54 and in front of it,
A collection trough 56 for floating waste is provided in which floating waste removed from the wastewater surface is received and discharged from the tank 10.

Similarly, a sludge trough 58 is provided on the inlet end wall 16 side, and sludge collected from the tank 12 is stored therein. Sludge is pumped from the sludge trough 58 intermittently or continuously as required by the process.

A plurality of brackets 60 are secured to each sidewall 14 at vertically spaced locations below the top of each sidewall 14 . and a bracket 60 on each side wall 14.
A rail 62 is fixed to. A rail 62 extends longitudinally along each sidewall and is connected to the collection vane 28 as it moves along the surface of the wastewater and removes floating waste therefrom.
Give the orbit for 8.

The rails 62 are located at such a level that the lateral collection vanes 28 are partially submerged in the waste water as they move on the rails 62.

FIG. 2a shows a detailed view of a preferred embodiment of the invention attached to one of three idler shafts 38. FIG. Idler shaft 38 freely rotates in self-aligning bearings 40 mounted to sidewall 14 of tank 10. A polymer split collar 70 is clamped to the shaft 38 at the point where the shaft 38 enters the bearing 40 by a circular band clamp 90, and the shaft 38
Limit the lateral movement of.

The split sprocket 32 described below can be any of the other sprockets 30, 32, 34, 36, but will be collectively referred to as 32 for ease of explanation.

Although each sprocket is nearly identical, sprocket 30 is provided with special means for converting an idler sprocket 32 into a drive sprocket 30, as described in more detail below. The idler shaft 38 does not impart any torque to the moving chain, but only functions as a directional guide, which requires that the sprockets rotate freely with the endless chain 26.

This point is achieved in one of two ways. 2nd b
In the figure, the sprocket 32 is fixedly attached to the shaft 38. The fixed attachment is located on the outer periphery of the axially extending hub shoulder 100 of the sprocket 32 and provides a pair of fixed attachments that serve the dual function of holding both halves of the sprocket 32 together while simultaneously clamping the sprocket to the shaft 38. This can be achieved by fixedly clamping the sprocket 32 onto the shaft 38 with a circular band clamp 92. In other words, in Figure 2b,
As endless chain 26 rotates around idler sprocket 32, shaft 38 also rotates.

If both sprockets 32 are attached to the shaft 38 in a fixed position, a problem arises when the two endless chains 26 extend differently, a not uncommon phenomenon. That is, if one chain were to extend more than the other, when both chains reached the fixed shaft 38 of the idler sprocket 32, one chain would jump off the sprocket, resulting in costly settling tank shutdowns and This necessitates repairs that are troublesome, if not unpleasant.

This problem of different chain extensions can be overcome by arranging the sprocket throats to rotate independently of each other, with one rotating independently of the shaft. FIG. 2a shows the sprocketer 32a thus rotatably engaged with the shaft 38 and rotating freely. That is, in addition to a circular band clamp 92 mounted on the axially extending hub shoulder 100 to hold the two parts of the split sprocket 32a together, a pair of split polymer collars 70 are attached to the split sprocket 32a. It is fixed to the shaft 38 on each side. A pair of polymeric stop collars 70 limit lateral movement of sprocket 32a on shaft 38. Using independently rotating sprockets like this allows you to compensate for differential elongation of both chains.

Referring now to FIG. 3, the polymer split sprocket 32 of the present invention shown therein, when joined along split line 106, has an axial bore 110, two side surfaces 114 (
(not visible in the drawing), a hub shoulder 112 extending axially from each of the hub shoulders 116 (
There are two mating parts 102, 104 forming a hub part 108 (described below). The sprocket 32 further includes:
A peripheral rim 120 having a plurality of outwardly projecting sprocket teeth 122 centrally located in a pair of axially extending rim portions 124 that support the side bars of the chain 26 as it moves around the sprocket 32. It is equipped with

The rim 120 is integrally connected to the hub 108 with a multi-spoke connection consisting of two thick spokes 126 and two thin spokes 128 in the preferred embodiment. Each thick spoke 126 has a split line 1
06 and provides structural support for it. Each spoke 126 also includes a pair of radially oriented tapered recesses 130 located on opposite sides of the split line 106 in proximate and parallel equidistant relation to the outer rim 120 . The split line 106 has a hole 132 centered between the ends of the tapered recess 130 . Although tapered recess 130 does not extend through both sides 114.116 of sprocket 32, a corresponding tapered recess extends through both sides 114.11.
6, located back to back.

The mating edge of mating part 102 and 104 is split line 10
6, the actual joining is from the hole 132 to the rim 12.
Only between 0 and 0. To take advantage of the compressibility of the polymeric material, the mating edges 102, 104 are provided with holes 132.
A gap 107 extending from the shaft hole 110 is provided.

When the sprocket 32 is assembled, the gap 107 is approximately 0.
．． 0.06 inch (approximately 0.15 am). Due to the natural compressibility of the polymeric materials used, gaps of this size have been found to create a tighter mechanical fit and provide greater torque resistance during sprocket operation.

Referring now to FIGS. 7 and 8, the tapered recess 130 and the hole 130 are located at 114° and 116° on opposite sides of the sprocket, respectively.
It receives a wedge-shaped dog clamp 134 consisting of a central flat area 136 and an inwardly sloped gripping area 138 disposed parallel to and directly in contact with. The angled gripping regions 138 of the wedge-shaped dog clamps 134 are each inserted into the tapered recess 130.

Further, the wedge-shaped dog clamp 134 is attached to the sprocket 13
It also has a central hole 140 that corresponds to hole 132 in FIG.

When the mating portions of sprockets 32 are coupled along split line 106, wedge-shaped dog clamps 134 are incorporated into each side 114, 116 of sprocket 32, with an inwardly sloped regripping area of wedge-shaped dog clamps 134 on each side. 138 face each other as shown in FIG. When the corresponding wedge-shaped dog clamp 134's recess 140 is aligned with the sprocket's hole 132,
A rigid fastener, such as a threaded bolt 142, is inserted therethrough to securely connect the two mating portions of the sprocket 32.

The wedge-shaped dog clamp assembled in this way is attached to the sprocket 32 as shown by arrows 144 and 146 in FIG.
A tensile force is applied in two directions to the coupled mating portions 102, 104 of. Arrows 144 represent diametrical tension forces and arrows 146 represent lateral tension forces. The two-directional tensile force applied by the wedge-shaped dog clamp 134 significantly increases the strength of the sprocket 32.

For corrosion protection purposes, wedge dog clamp 134 and fastener 142 are made of a non-corrosive material such as stainless steel.

The mating portions 102, 104 of the polymer split sprocket 32 of the present invention are connected to the wedge-shaped dog clamp 134 described above.
In a two-piece yoke-like clamp 150 fastened together at 152, conventional steel sprockets are typically be combined. When sprocket 32 must be secured to shaft 38, a set screw 154 is often used. A set screw 154 is screwed through one half of the yoke clamp 150 in a direction perpendicular to the axis of the shaft 38 until it contacts the shaft. Shaft 38 may or may not have a keyway or other special recess (not shown) to assist set screw 154 in holding sprocket 32 in place.

This hub fixing device works well if all parts are made of steel or other metal. However, steel parts are prone to corrosion, are too heavy, and stainless steel parts are expensive. Previous attempts to make the yoke clamp 150 that holds the sprocket out of polymeric materials have had limited success because the yoke clamp 150 cannot reliably grip the shaft 38.

Set screw 1 in combination with polymer yoke clamp
When using a holder such as 54, a point load of 15 is applied to the shaft.
6, which is concentrated at a location 90'' from the attachment point of the bolt 152. Therefore, the lack of creep resistance for this type of load causes a deformation 158 in the collar 150, which is not desired for optimal gripping action. Effectively reduces the amount of shaft/surface contact.

As a result, a hub flange stop that applies a uniform gripping force along the entire circumference of the shaft 38, rather than applying a concentrated point gripping action, was required to retain the polymer split sprocket.

Referring to FIG. 6, the circular band clamp 92 consists of a circumferential band 160, each end of which is doubled over and riveted, and the T-shaped port clamping means 16
Form a loop 162 around 4.

This provides a device that applies a clamping force around the entire circumference of the hub shoulder 112, as shown by force lines 166 in FIG. As a result, the hub retainer can apply a 360 degree force with negligible deformation of the polymeric hub shoulder 112.

The T-bolt 164 of the clamp band 92 is shown in detail in FIG. 6a. The T-shaped bolt 164 includes a T-shaped bolt main body 170 whose head 172 is attached to the clamp band 9.
The shaft 1 of the T-bolt is surrounded by one end loop of the T-bolt 1 and inserted into the aperture 170 provided in the end loop.
76 is inserted. The shaft 176 has a similar aperture 17 in the end loop 162 opposite the circumferential band, 160.
4 also extends through it. The shaft 176 is then inserted into a T-shaped barrel sleeve 178 with a flattened end 180 and secured therein with a nut 182. shaft 176
Attach the nut 182 to the flat end 180 of the sleeve 178.
By tightening against each other, the end loops 162 of the outer circumferential band 160 are drawn toward each other.

What has been described above is the means for retaining the split polymer sprockets 32, 34, 36, either in a fixed position as in FIG. 2b or freely rotating as in FIG. 2a to perform an idler function. However, the construction of split drive sprocket 30 made of polymeric material poses unique problems due to free slipping contact between sprocket 30 and drive shaft 39. Drive sprocket 3
0 is not securely fixed to the drive shaft 39, reliable torque transmission to the drive sprocket of the head shaft cannot be achieved.

Conventional drive sprocket hubs have included a key seat extending along the entire length of the hub for use in conjunction with a keyed shaft. However, as in the case of the set screw holder described above, the keyway shaft method works well with a steel hub, but due to the deformation of the polymer hub, the keyway becomes distorted and the hole is drilled, as shown in Figure 5. becomes enlarged.

In the present invention, an inner locking keyway 118 molded in the shaft hole 110 of the hub portion 108 of the drive sprocket 30 is provided.
The slip problem of the drive sprocket was solved by using Because the keyways 118 are for locking purposes, they do not extend the length of the hub, but rather terminate just short of each hub face 190. The remaining diameter holes 190 at each end of the hub function as key retainers. A band clamp 92 cooperates with the keyway 118 to restrain movement of the hub material, prevent distortion of the keyway, and ensure reliable torque transmission between the head shaft and drive sprocket.

Molding the keyway does not add any cost to the sprocket 32. Furthermore, although their keyways are not used to secure the sprockets to the idler shaft, they can be used to secure each sprocket 30.32 without reducing strength.
．． By providing key grooves 118 at 34 and 36 and molding, all sprockets can be made equally.

For ease of installation, the split line 106 forms an angle of less than 180° so that the mating portion 1 of the sprocket 32
02.104 have different sizes.

This allows one worker to first install the larger mating portion 102 and hold it against the shaft 38 or 39 and keep it fixed there, without the need for assistance from other workers; Installation of the sprocket of the present invention onto the shaft is facilitated by attaching the smaller mating portion 104 with a free hand and securing it with the band clip 92 and wedge dog clamp 134. The drive sprocket (drive sprocket) 30 is assembled in much the same way, but before applying the mating part 102 to the shaft 39, insert the key (not shown) on the shaft into the keyway 118 of the mating part 102.
An additional step is required to insert the

As described above, according to the present invention, fixed coupling and attachment to a rigid shaft is possible by a three-part device including a wedge-shaped dog clamp, an outer hub clamp, and an inner locking keyway. A polymer molded sprocket transport and a retaining device therefor are provided which are comprised of a sprocket that is divided into mutually different sized mating parts with integrally molded features.

While specific embodiments of polymer molded sprocket wheels have been illustrated and described, it will be apparent to those skilled in the art that many modifications and changes may be made without departing from the broad scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a settling tank using a polymer molded sprocket wheel of the present invention; FIG. 2a is a partially sectional front view of a chain idler shaft of a sedimentation tank equipped with a polymer molded sprocket wheel of the present invention. Figure 2b is a partially sectional front view of a chain idler shaft of a settling tank with another embodiment of the means for attaching a polymeric sprocket wheel of the invention; Figure 3 is a polymeric sprocket wheel of the invention; Figure 4 is an enlarged sectional view of the hub portion of the sprocket wheel of the present invention, showing the slotted keyway for locking; Figure 5 is a side view of the sprocket wheel of the present invention; Figure 6 is a side view of the conventional means used for attachment; Figure 6 is a side view of the circular band clamp of the present invention; Figure 6a
The figure is a perspective view showing the clamp mechanism shown in FIG. 6; FIG. 7 is a sectional view of the wedge-shaped dog clamp of the present invention; and FIG. 8 is a bottom view of the wedge-shaped dog clamp shown in FIG. 30... Drive sprocket wheel, 32.34.36...
・Idler sprocket wheel, 38... Idler shaft, 39... Drive shaft, 90.92... Band clamp, 100° 112... Hub shoulder, 102.10
4...Mating part, 106...Dividing line, 10
8...Hub part, 110...Shaft hole, 114°116.
...Side surface, 118...Slot-shaped keyway, 120...
・Outer rim, 122...Sprocket tooth, 124...
- Chain support portion, 126.128... Connection means (spoke-shaped member), 130... Tapered recess, 132.
... hole, 134 ... clamping means (wedge-shaped dog clamp'), 142 ... tightening means (tightening tool). Applicant Envirex Incorporated Representative Yukio Maruyama FI6
．． 6 L Heron j

Claims (18)

[Claims] (1) mounted on a rigid shaft, each corresponding to two
A polymer having two interlocking mating portions having two side faces, a split line along the mating surfaces of the mating portions, and an outer rim having a plurality of radially projecting sprocket teeth and an axially extending chain support. A split sprocket wheel comprising: a hub portion having an axle hole and a shoulder extending axially from the hub portion on each of the sides; at least one locking slot-like keyway in the sprocket used; means for connecting said hub portion to an outer rim; at least one pair of said lateral surfaces each formed on each side of said split line; a tapered recess; a clamping means disposed straddling the dividing line and drawing the mating parts of the sprocket wheels toward each other by applying a clamping force to each pair of the tapered recesses; A split polymer sprocket wheel comprising: a circular band clamp configured and arranged to fit around a shoulder. (2) The connecting means comprises a plurality of integral spoke-like members, at least two of which provide a path for forming a split line between the hub portion and the outer rim. Split sprocket wheel. (3) A polymer split sprocket wheel according to claim 2, characterized in that it consists of four spoke-like members. (4) The polymer split sprocket wheel according to claim 2, wherein the spoke-like members including the split line are thicker than the remaining spoke-like members. (5) A polymer split sprocket wheel according to claim 1, wherein the tapered recesses are radially oriented and substantially parallel to each other. (6) The polymer split sprocket wheel according to claim 5, wherein the tapered recess is formed and arranged parallel to the split line. (7) The polymer splitter according to claim 1, wherein the clamping means for joining the mating portions of the sprocket wheels comprises a pair of rigid wedge-shaped dog clamps for each set of tapered recesses. shaped sprocket wheel. (8) The polymer split sprocket wheel according to claim 7, wherein the wedge-shaped dog clamp is fixed to the sprocket wheel by a tightening means. (9) A polymer split sprocket wheel according to claim 8, wherein said tightening means comprises a wedge-shaped dog clamp and a rigid fastener extending axially through the sprocket wheel. (10) The polymer split sprocket according to claim 9, wherein the tightening means comprises a wedge-shaped dog clamp and one rigid fastener that axially penetrates the sprocket wheel on the split line. ring. (11) The polymer split sprocket wheel according to claim 7, wherein the tapered recesses on both sides are arranged back to back. (12) Claim 1, characterized in that the wedge-shaped dog clamps arranged back to back are fixed by a tightening means.
Polymer split sprocket wheel according to item 1. (13) The polymer split sprocket according to claim 11, wherein the tightening means comprises a wedge-shaped dog clamp and one rigid fastener that axially penetrates the sprocket wheel on the split line. ring. 14. The polymer split sprocket wheel of claim 13, wherein said tightening means includes two wedge-shaped dog clamps. 15. A polymer split sprocket wheel according to claim 1, wherein the split line forms an angle of less than 180°. 16. The polymer split sprocket wheel of claim 1, wherein said circular band clamp applies a uniform clamping force along the entire circumference of the hub shoulder. 17. The polymer split sprocket wheel of claim 1, wherein said sprocket wheel is made from high strength polyurethane or other industrial grade polymer. (18) two interlocking mating parts attached to a relatively immovable but rotatable rigid shaft and forming a two-sided sprocket when joined; a split line along the mating surface of the mating parts; and a polymer split sprocket wheel having an outer rim having a plurality of radially projecting sprocket teeth and an axially extending chain support, the hub portion having an axle hole and a shoulder, the hub shoulder having a extending axially from the hub portion on each of said side surfaces; said axle hole having at least one locking slotted keyway in a sprocket used for torque transmission; a plurality of integral spoke-like members, at least two of which include split lines; the mating portions of said sprocket wheels include: a pair of substantially parallel spokes formed in parallel on each side across the split lines; parallel tapered recesses with the tapered recesses on each side in back-to-back relationship; configured and arranged to engage the tapered recesses on each side to draw mating portions of said sprocket wheel toward each other; In the wedge-shaped dog clamp, adjacent wedge-shaped dog clamps on both sides are connected by a fastener extending through the split line between both dog clamps and a hole that passes through the sandwiched area of the mating portion of the sprocket wheel. and configured to hold the mating parts of the sprocket wheel together in the region of the hub portion by surrounding the outwardly projecting hub shoulder so that a uniform clamping force is applied over the entire circumference of the hub shoulder. Circular band clamps arranged;
A polymer split sprocket wheel comprising: held together by at least two wedge-shaped dog clamp assemblies comprising: