TWI744367B - Cassette driver for a freewheel hub - Google Patents

Abstract

Forward movement of a bicycle results when force is transfer from the chain or belt to a sprocket on a cassette. The cassette is splined to the cassette driver and causes the wheel of the bike to rotate when torque is applied from the cassette to the cassette driver. The cassette driver is typically made of a strong hard material such as steel to withstand the forces imparted thereon by the cassette. The present disclosure provide a hub configuration and method that enables the cassette driver to be made with construction of a lighter weight material such as aluminum yet still withstand the toque applied thereto.

Description

Card-type flywheel driver for flywheel hub

A cassette type flywheel drive used for a flywheel hub.

The flywheel pedal wheel hub system is well known. For example, US 2,211,548 of Frank W. Schwinn issued on June 24, 1940 is directed to a flywheel bicycle hub configuration. The hub of the flywheel pedal is configured so that the rotation of the pedal can drive the rotation of the wheel while also allowing the wheel to rotate independently of the rotation of the pedal. This functionality allows the pedals of the bicycle to remain stationary when the wheels rotate as the bicycle slides. Generally, the flywheel hub is configured for gear applications that include a rear cassette flywheel. A cassette flywheel driver is a part of a hub that supports a cassette flywheel and drives the rotation of the cassette flywheel.

When force is transferred from a chain or belt to a sprocket on a cassette freewheel, it causes a bicycle to move forward . The cassette flywheel spline is connected to the cassette flywheel drive and causes the wheels of the bicycle to rotate when torque is applied from the cassette flywheel to the cassette flywheel drive . The cassette flywheel drive is usually made of a strong and hard material such as steel to withstand the force imparted to it by the cassette flywheel . The present invention provides a hub configuration and method that enables the cassette flywheel drive to be constructed of a lighter weight material such as aluminum, but still withstand the torque applied to it.

Referring to Fig. 1, there is shown a first embodiment of a hub according to the present invention. In the illustrated embodiment, the hub 10 includes a hub body 12, an axle 14 and a freewheel drive 16. In the illustrated embodiment, the hub 10 is configured to rotate idly. In other words, a cassette flywheel drive 16 rotates together with the hub body 12 when the wheels are driven by the cassette flywheel drive 16 and the cassette flywheel drive 16 rotates relative to the hub body 12 when the wheels are sliding (rotating but not driven). Generally speaking, the configuration of the hub 10 is explained in more detail with reference to the drawings. In the illustrated embodiment, the hub 10 is configured to be used with a multi-speed bicycle (eg, road bicycle, mountain bicycle, etc.) that utilizes an external cassette flywheel driven by a chain. In the illustrated embodiment, the axle 14 is coaxially arranged in the hub body 12. Specifically, the axle 14 extends through the hub body 12. The axle 14 includes a first end portion 18 positioned in the first end portion 22 of the hub main body 12 and a second opposite end portion 24 including a portion extending outward from the second end 26 of the hub main body 12. It should be understood that the principles of the present invention may alternatively be integrated into a single-speed bicycle. In the illustrated embodiment, the first end portion 18 of the axle includes a shoulder 28. The hub body 12 includes a card that is aligned with the shoulder 28 in a radial direction such that a snap ring 32 and the shoulder 28 cooperate to limit the axial movement of a bearing set 34 in a direction toward the second end 26 of the hub body 12环槽30。 Ring groove 30. The bearing assembly 34 engages an outer surface of the axle and an inner surface of the inner cavity 56 of the hub body 12. In the illustrated embodiment, the second end portion 24 of the axle 14 is coaxially arranged in both the hub main body 12 and the drive end portion 48 of the cassette flywheel driver 16. In the illustrated embodiment, a part of the second end portion 24 of the axle 14 extends into the driven end of the cassette flywheel. In the illustrated embodiment, the second end portion 24 of the axle 14 is interfaced with the cassette flywheel driver 16 via the bearing set 52. In the illustrated embodiment, the hub body 12 includes a one-piece structure. The hub body 12 is machined from a single piece of aluminum (for example, aluminum 7075T651). The hub body 12 defines a longitudinal axis of rotation A-A. The hub body 12 includes an internal cavity 56 that receives the axle 14 and the drive end portion 48 of the cassette freewheel drive 16. The hub body 12 includes a first radially extending flange 58 located at the first end portion 22 of the hub body 12 and a second radially extending flange 60 located at the second end of the hub body. Each of the radially extending flanges 58, 60 includes a plurality of spaced through apertures 62 that are configured to secure the spokes. The tie adjacent to the first radially extending flange 58 is configured to support a disc brake mounting flange 64 of a disc brake system. The outer cylindrical body of the hub body 12 tapers from the second flange 60 toward the first flange 58. In other words, the outer diameter of the hub body 12 adjacent to the second flange 60 is larger than the outer diameter of the hub body 12 adjacent to the first flange 58. In the illustrated embodiment, the wall thickness of the hub body 12 is larger in the portion radially overlapping with the driving end portion 48 of the cassette flywheel driver 16 compared to the portion not overlapping with the cassette flywheel driver 16. In the illustrated embodiment, the internal cavity 56 of the second end portion 26 of the hub body defines two internal cylindrical surfaces. A first cylindrical surface 66 is defined as a distance D1 from the longitudinal axis of rotation A-A, and a second cylindrical surface 68 is defined as a distance D2 from the longitudinal axis of rotation A-A. In the illustrated embodiment, D2 is greater than D1 and the first surface 66 is closer to the first end portion 22 of the hub body 12 than the second cylindrical surface 68 is. In the illustrated embodiment, the hub main system is machined by a process so that the hub main body is not removed from a mandrel until the first cylindrical surface 66 and the second cylindrical surface 68 are machined. In the illustrated embodiment, the cassette flywheel driver 16 includes an internal cavity 70 extending from a driving end portion 48 to an opposite driven end portion 72. The cavity receives the axle 14 extending into the drive end portion 48 of the cassette freewheel drive 16. The cassette flywheel driver 16 defines a longitudinal rotation axis that is coaxial with and coincides with the rotation axis A-A of the hub body 12. In the illustrated embodiment, the drive end 48 of the cassette flywheel driver 16 includes a plurality of coaxial cylindrical surfaces positioned in the hub body 12 opposite to the inner cylindrical surfaces 66 and 68 of the hub body 12. In the illustrated embodiment, an annular snap ring groove 76 is positioned in the first cylindrical surface 66 of the inner cavity 56 of the hub body 12 opposite to an end surface 78 of the drive end portion 48 of the cassette flywheel driver 16 . A first cylindrical surface 80 extends from the end face 78 of the cassette flywheel drive toward the driven end 72 of the cassette flywheel drive 16. The first cylindrical surface 80 of the driving end 48 and the first cylindrical surface 66 together define a first annular cavity that receives a bearing set 82 interposed between the driving end 48 of the cassette flywheel driver 16 and the hub body 12. In the illustrated embodiment, a second cylindrical surface 84 having a diameter larger than a diameter of the first cylindrical surface 80 extends from the first cylindrical surface 80 toward the driven end 72 of the cassette flywheel driver 16. The second cylindrical surface 84 of the driving end 48 and the second cylindrical surface 68 together define an annular cavity that receives a non-wheel pad clutch assembly. In the illustrated embodiment, the surface gloss of the second cylindrical surface 84 is less than or equal to Rz of 2.5 microns and has an HRC hardness of at least 56 (for example, between 58 and 62). In the illustrated embodiment, the second cylindrical surface 84 has a diameter greater than 22 mm (for example, 29 mm). In the illustrated embodiment, the second cylindrical surface is constructed of stainless steel. In the illustrated embodiment, the anti-wheel pad clutch assembly includes an anti-wheel pad sleeve 86, an anti-wheel pad retaining cage 88, an anti-wheel pad 90 and a force belt 92. In the illustrated embodiment, the surface luminosity of the inner surface of the stop ring sleeve is less than or equal to Rz of 2.5 microns and the inner surface of the stop ring sleeve has at least 56 (for example, between 58 and 62) One of HRC hardness. In the illustrated embodiment, the wheel washer sleeve 86 has a diameter less than 40 mm (for example, 37 mm). The anti-wheel washer sleeve has a height dimension which is larger than that of the anti-wheel washer retaining cage 88. The wheel washer sleeve 86 includes a snap ring groove that receives a snap ring that restricts the axial movement of the wheel washer cage 88 toward the driven end 72 of the cassette flywheel driver in the axial direction. In the illustrated embodiment, the wheel stop washer sleeve is constructed of a 5210 bearing roller profile steel that is press-fitted/interference-fitted to the second cylindrical surface 68 of the hub body 12. In spite of the strong radial force generated by the wheel stop pad 90, the structure of the wheel stop pad sleeve 86 and the hub body 12 still cooperatively provide the structural rigidity required for reliable and long-term operation of the wheel hub. The wheel pad and the wheel pad cage used in the illustrated embodiment are currently commercially available from GMN Paul Müller Industrie GmbH & Co. KG. In the illustrated embodiment, a third cylindrical surface 94 extends coaxially from the second cylindrical surface 84 toward the driven end 72 of the cassette flywheel driver 16. The third cylindrical surface 94 has a diameter larger than the diameter of the second cylindrical surface 84. A shoulder 96 is provided on the card flywheel driver 16 between the third cylindrical surface 94 of the card flywheel driver 16 and the driven end 72. The third cylindrical surface 94 and the second cylindrical surface 68 of the drive end 48 of the cassette flywheel drive 16 together define and receive one of the bearing sets 98 interposed between the drive end 48 of the cassette flywheel drive 16 and the hub body 12 The first annular cavity. The shoulder 96 restricts the axial movement of the bearing assembly 98 toward the driven end 72 of the cassette flywheel driver 16 in this direction. An end surface of the stop wheel washer sleeve 86 restricts the axial movement of the bearing set 98 toward the first cylindrical surface 80 of the driving end 48 of the cassette flywheel driver 16 in the axial direction. In the illustrated embodiment, the third cylindrical surface 94 includes an o-ring and an annular groove that is configured to receive an o-ring that seals the interface between the third cylindrical surface 94 and the bearing set 98. In the illustrated embodiment, the internal cavity of the drive end 48 of the cassette flywheel drive includes a first cylindrical surface 100 defined by a first diameter that is larger than the diameter of the axle. This configuration leads to further weight saving and strength of the cassette flywheel drive and promotes its precision manufacturing. In the illustrated embodiment, this configuration results in a high-performance hub because it has the strength and durability to withstand frequent use while being lightweight and smooth in operation. The hub body 12 is constructed from a lightweight, relatively soft aluminum material and is designed so that it can be manufactured with high precision. This is because the cylindrical surfaces 66 and 68 mentioned above can be used without the hub body 12 Machining with separation from the chuck holding the part during machining. Press the hard and robust wheel stop sleeve 86 into the softer aluminum. The pressing process forms a tight interference fit between the stop wheel washer sleeve 86 and the cylindrical surface 68. This interface allows the hub body 12 to work together to resist the radial force generated by the wheel stop pad. The wheel stop sleeve 86 provides a hardened surface to interface with the wheel stop and also provides additional structural strength for the wheel hub. The hub of the illustrated embodiment does not need to be rebuilt and can be operated in extreme environments including environments cold to -50 degrees Fahrenheit. In the illustrated embodiment, the wheel cage and the cassette flywheel driver 16 move together. A tension member (for example, a spring) on the anti-wheel pad cage biases the individual anti-wheel pad against the cylindrical surface 84 of the cassette flywheel driver 16 to cause the anti-wheel pad cage to be substantially tension-mounted to the cassette flywheel driver 16. The inner end of the wheel stop pad contacts the second outer surface 84 of the card-type flywheel driver and is biased radially outward against a spring and extends radially slightly beyond the peripheral edge of the wheel stop pad cage. This configuration results in a small and light contact between the wheel pad and the wheel pad sleeve 86 during coasting, which results in a very low friction configuration because the clutch configuration is disengaged during coasting. The non-driving force applied between the hub body 12 and the cassette flywheel driver 16 is transferred through the bearing sets 82 and 98 that clamp the pad clutch assembly. In the illustrated embodiment, as long as the driven end 72 is rotated in the driving direction at a rotation speed exceeding the rotation speed along the driving direction of the hub main body 12, the wheel stopper will engage the wheel stopper sleeve 86 and abut against it. The wheel pad sleeve 86 locks and transfers torque from the cassette flywheel drive 16 to the hub body 12. In the illustrated embodiment, the pad clutch assembly transfers torque to drive the hub forward. However, it does not rely on the anti-wheel pad clutch assembly because a bearing set supports the relative rotation between the cassette flywheel driver 16 and the hub body 12. This configuration results in a clutch configuration that engages immediately when the driven end is driven. For example, in the configuration shown, the driven end cannot rotate more than a small amount in the driving direction relative to the hub body before it is fully engaged and the torque is transferred from the cassette flywheel driver 16 to the hub body 12. As a result, the hub body and the cassette flywheel driver 16 are caused to rotate together. The relative rotation amount in the driving direction (commonly referred to as play or clearance) may be less than 5 degrees (for example, less than 2 degrees, less than 1 degree, or half a degree). In the illustrated embodiment, the driven end portion 72 is connected to the driving end portion. As discussed above, the drive end portion includes a plurality of coaxial cylindrical surfaces. In the illustrated embodiment, the driven end portion 72 is formed of aluminum and includes a cylindrical body portion 110 and a plurality of axially extending convex splines 112 spaced apart on the cylindrical body portion 110. In the illustrated embodiment, adjacent splines define a channel 134 therebetween. In the illustrated embodiment, the spline extends axially from a rear wall 138 positioned at an end portion of the cylindrical body portion. The spline 112 is configured to engage a cassette flywheel composed of a sprocket and a spacer. It should be understood that in alternative embodiments, the driven end portion is not integrally connected to the drive end portion (for example, it is a separate component). In the illustrated embodiment, at least one of the splines is integrally formed on the surface of the cylindrical body portion 110 of the cassette flywheel driver. At least one spline 114 includes a drive side 116 that includes a reinforced engagement member 118. In the illustrated embodiment, at least three of the splines 114, 120, 122 are integrally formed on the surface of the driven end portion of the cassette flywheel drive. In the illustrated embodiment, all of the splines are integrally formed on the surface of the cassette flywheel drive. However, many other alternatives are also possible. In the illustrated embodiment, at least three splines each include a driving side 116, 124, 126. Each of the drive sides of the spline includes a reinforced engagement member 118, 128, 130. The reinforced engagement member may include a portion having a radius surface 132 (see FIG. 8). Additionally or alternatively, the reinforced engagement member may include an undercut surface 136 on the drive side of the spline (see FIG. 9). And, in addition or alternatively, the reinforcing member may be at least partially recessed into the groove 144 in the channel 134 between adjacent splines (see FIG. 6). Additionally or alternatively, the strengthening member may include a circular pin receiving aperture 142 configured to receive one end of a circular pin (see FIGS. 10 and 11). Additionally or alternatively, the reinforcing engagement member is configured to radially receive a reinforcing member and to fix the reinforcing member adjacent to the driving side of the spline (see FIG. 8). Another option is that the reinforcing engagement member is configured to axially receive a reinforcing member and to fix the reinforcing member adjacent to the driving side of the spline (see Figures 10 and 11). It should be understood that many configurations are possible. In the illustrated embodiment, the driving end portion of the card-type flywheel driver includes at least one reinforcing component 140. In the illustrated embodiment, the reinforcing member has an HRC hardness of at least 56 (for example, between 58 and 62) and is engaged with the reinforcing engaging member. In the illustrated embodiment, the strengthening member is a round steel pin. In some embodiments, the circular pin can be snapped into engagement with the reinforced engagement member (Figure 8). In some embodiments, the end of the reinforcing member (for example, a circular pin) is pressed into a hole 142 on the rear wall 138 (FIG. 10 and FIG. 11). In the illustrated embodiment, the distance from a rotating shaft to the distal edge of a reinforcing member does not exceed the distance from the rotating shaft to the top surface of a spline (that is, the reinforcing member is flush with the top of the spline or Not so flush). The present invention also provides a method of manufacturing a wheel hub. The method includes the following steps: machining a cassette flywheel drive from an aluminum body. The machining step includes forming a driving end portion 48 and a driven end portion 72, wherein the driving end portion includes a plurality of coaxial cylindrical surfaces and the driven end portion includes a cylindrical body portion, the cylindrical body portion is included in the cylinder A plurality of axially extending convex splines 112 are spaced apart on the shaped body portion 110, wherein the splines define a plurality of channels 134 between adjacent splines. In the illustrated embodiment, at least one spline includes a driving side, and the driving side includes a reinforcing engagement member 140. The method may further include the following steps: fixing a reinforcing member to the reinforcing engaging member. The method may further include connecting a steel insert 150 above the driving end portion of the cassette flywheel drive and machining the steel insert thereafter. The step of connecting the steel insert may include the following steps: pressing the steel insert to engage with the drive end portion of the cassette flywheel drive or fasten the insert on the drive end portion of the cassette flywheel drive. The step of connecting the steel insert may include the following steps: align the tang with the notch in the drive end of the cassette flywheel driver in the axial direction. Once the tang is engaged with the notch, it prevents the relative rotation of the steel insert with respect to the cassette flywheel drive. In the illustrated embodiment, the steel insert includes opposite tangs and has a curved outer surface and a curved inner surface. It should be understood that many other configurations are possible, including, for example, configurations with more or less tangs (for example, four tangs). The step of machining the steel insert after connecting the steel insert to the steel drive can be used to ensure the concentricity of the steel insert with the other cylindrical surface of the drive end portion 48 of the cassette flywheel drive. Many other connection methods are also possible. Referring to Figures 19 to 26, an alternative embodiment of a cassette flywheel drive is shown. In the illustrated embodiment, the cassette flywheel driver 160 includes splines 162, 164 each including a longitudinal side 166, 168, 170, and 172. The opposite side adjacent to the spline contains a reinforced engagement member. The reinforced engagement member may include a portion having a radius surface. Additionally or alternatively, the reinforced engagement member may include an undercut surface on the longitudinal side of the spline. It should be understood that many configurations are possible.

In the illustrated embodiment, the drive end portion of the cassette flywheel driver includes at least one reinforcing component 180. In the illustrated embodiment, the reinforcing member has an HRC hardness of at least 56 (for example, between 58 and 62) and is engaged with the reinforcing engaging member. In the illustrated embodiment, the strengthening member 180 is a steel spring clip with a circular cross-section. In the illustrated embodiment, the spring clip 180 includes a first leg 190 and a second leg 192 connected to each other via a base portion 182. In some embodiments, the spring clip 180 snaps into or slides axially into engagement with the reinforced engagement member. In the illustrated embodiment, the spring force of the spring clip 180 acts outward against the longitudinal sides 168, 170 of the adjacent splines 162, 164 to hold the spring clip in place against the opposite longitudinal surfaces of the adjacent splines. .

In the illustrated embodiment, the distance from a rotating shaft to the distal edge of a reinforcing member does not exceed the distance from the rotating shaft to the top surface of a spline (that is, the reinforcing member is flush with the top of the spline or Not so flush).

In the illustrated embodiment, the base portion 182 of the spring clip 180 is received in an undercut portion 184 of a rear shoulder 186 that forms an undercut cavity 188. The base portion 182 facilitates the retention of the spring clip 180. In the illustrated embodiment, the spring clip 180 can be fitted to the cassette flywheel drive before the cassette flywheel is installed on the cassette flywheel drive. In the illustrated embodiment, the spring clip can be assembled to the cassette freewheel drive before being shipped and sold during the manufacturing of the cassette freewheel drive.

In an alternative embodiment, the spring clip may be installed on the cassette flywheel drive during assembly of the bicycle or even after the cassette flywheel is installed on the cassette flywheel drive. In the illustrated embodiment, the card-type flywheel driver is installed first, and then the spring clip can be installed, wherein each end is held in the undercut cavity 188 and the base 182 is positioned at the distal end of the card-type flywheel driver. It should be understood that many alternative configurations are possible.

In the illustrated embodiment, the card-type flywheel drive includes three spring clips spaced apart on the card-type flywheel drive. In the illustrated embodiment, the spring clip is held between alternating splines. In the illustrated embodiment, the spring clips are evenly spaced around the periphery of the cassette flywheel body about 120°. It should be understood that many alternative configurations are possible. The above specification, examples and data provide a complete description of the manufacture and use of the composition of the present invention. Since many embodiments of the present invention can be made without departing from the spirit and scope of the present invention, the present invention resides in the scope of the patent application attached below.

3-3‧‧‧line Line 4-4‧‧‧ Line 9-9‧‧‧ 10‧‧‧Wheel 10-10‧‧‧line 12‧‧‧Wheel body 14‧‧‧Axle 16‧‧‧Cassette Flywheel Drive 16-16‧‧‧line 17-17‧‧‧line 18‧‧‧First end part 22‧‧‧First end part 22 24‧‧‧Second opposite end part/second end part 26‧‧‧Second end/Second end part Line 26-26‧‧‧ 28‧‧‧Shoulder 30‧‧‧Snap ring groove 32‧‧‧Snap Ring 34‧‧‧Bearing set 48‧‧‧Drive end part/drive end 52‧‧‧Bearing set 56‧‧‧Internal cavity 58‧‧‧First radial extension flange/radial extension flange/first flange 60‧‧‧Second radial extension flange/radial extension flange/second flange 62‧‧‧Through hole 64‧‧‧Disc brake mounting flange 66‧‧‧First cylindrical surface/first surface/internal cylindrical surface/cylindrical surface 68‧‧‧Second Cylindrical Surface/Internal Cylindrical Surface/Cylindrical Surface 70‧‧‧Internal cavity 72‧‧‧Relative driven end part / driven end / driven end part 76‧‧‧Annular snap ring groove 78‧‧‧end face 80‧‧‧First cylindrical surface 82‧‧‧Bearing set 84‧‧‧Second Cylindrical Surface/Cylindrical Surface/Second External Surface 86‧‧‧stop wheel washer sleeve 88‧‧‧Rolling pad retaining cage/Rolling pad cage 90‧‧‧wheel stop pad 92‧‧‧Tension Band 94‧‧‧Third cylindrical surface 96‧‧‧Shoulder 100‧‧‧First cylindrical surface 110‧‧‧Cylindrical body part 112‧‧‧Axial extension raised spline/spline 114‧‧‧Spline 116‧‧‧Drive side 118‧‧‧Reinforced meshing parts 120‧‧‧Spline 122‧‧‧Spline 124‧‧‧Drive side 126‧‧‧Drive side 128‧‧‧Reinforced meshing parts 130‧‧‧Reinforced meshing parts 132‧‧‧radius surface 134‧‧‧channel 136‧‧‧Undercut surface 138‧‧‧Back Wall 140‧‧‧Strengthening parts/strengthening mesh parts 142‧‧‧Circular pin receiving hole/aperture 144‧‧‧Groove

150: Steel insert

162: Spline

164: Spline

166: Longitudinal side

168: Longitudinal side

170: Longitudinal side

172: Longitudinal side

180: Reinforced parts/spring clamps

182: base part/base

184: undercut part

186: Back Shoulder

188: Undercut cavity

190: First leg

192: second leg

A-A: Longitudinal rotation axis/rotation axis

D1: distance

D2: distance

Fig. 1 is an isometric view of a hub according to the principles of the present invention; Fig. 2 is a longitudinal sectional view of the hub of Fig. 1; Fig. 3 is a sectional view of the hub taken along the line 3-3 of Fig. 2; Fig. 4 is a cross-sectional view of the hub taken along the line 4-4 of Fig. 2; Fig. 5 is an exploded assembly view of the hub of Fig. 1; Fig. 6 is a first perspective view of a first embodiment of a cassette flywheel drive Figures; Figure 7 is a second perspective view of an embodiment of the card-type flywheel drive of Figure 6; Figure 8 is an assembly view of the first embodiment of the card-type flywheel drive of Figure 6; Figure 9 is along the line of Figure 10 A cross-sectional view of the card-type flywheel drive of Fig. 6 taken along line 9-9; Fig. 10 is a cross-sectional view of the card-type flywheel drive of Fig. 6 taken along line 10-10 of Fig. 9; Fig. 11 is of Fig. 10 An enlarged view of a part; Fig. 12 is an enlarged view of a part of Fig. 8; Fig. 13 is a first perspective view of a second embodiment of a cassette flywheel drive; Fig. 14 is an implementation of the cassette flywheel drive of Fig. 13 Example 1 of the second perspective view; Fig. 15 is an assembly view of the first embodiment of the cassette flywheel drive of Fig. 13; Fig. 16 is the cassette flywheel drive of Fig. 13 taken along the line 16-16 of Fig. 17 A sectional view; Fig. 17 is a sectional view of the cassette flywheel drive of Fig. 13 taken along the line 17-17 of Fig. 16; Fig. 18 is a part of a hub and a component shown in Fig. 2 according to the present invention Perspective view; Fig. 19 is a first perspective view of a third embodiment of a cassette flywheel drive; Fig. 20 is a second perspective view of a cassette flywheel drive of Fig. 19; Fig. 21 is a cassette flywheel drive of Fig. 19 A third perspective view; Fig. 22 is a first assembly view of the cassette flywheel drive of Fig. 19; Fig. 23 is a second assembly view of the cassette flywheel drive of Fig. 19; Fig. 24 is a cassette flywheel of Fig. 19 A third assembly view of the driver; FIG. 25 is an end view of the cassette flywheel drive of FIG. 19; and FIG. 26 is a cross-sectional view of the cassette flywheel drive of FIG. 19 taken along the line 26-26.

162‧‧‧Spline

164‧‧‧Spline

180‧‧‧Strengthening parts/spring clamps

186‧‧‧Back shoulder

Claims (15)

A card-type flywheel driver, comprising: a cylindrical body part; a plurality of axially extending convex splines, which are spaced apart on the cylindrical body part; wherein at least one of the splines is integrally formed in On the surface of the driven end portion of the card-type flywheel driver; wherein the at least one spline includes a driving side, the driving side includes a reinforced engagement member; a spring clip engaged with the reinforced engagement member, the spring clip is formed by It is constructed from a material having a hardness that is greater than a hardness of the cassette flywheel driver, wherein the spring clip includes a first leg and a second leg connected via a base portion; and the first leg and The second leg applies a spring force that acts outwardly to abut the adjacent splines to keep the spring clip in place between the adjacent splines. Such as the cassette flywheel drive of claim 1, wherein the spring clip includes a circular cross-section and is made of steel. For example, the cassette flywheel driver of claim 1, wherein the distance from a rotating shaft to a far edge of the spring clip does not exceed the distance from the rotating shaft to a top surface of the spline. For example, the cassette flywheel driver of claim 1, further comprising a rear wall, wherein the splines extend axially from the rear wall, wherein the rear wall includes an undercut cavity that receives a part of the spring clip. Such as the card-type flywheel drive of claim 1, wherein the reinforced engagement member is an undercut surface on the driving side of the spline. Such as the card-type flywheel drive of claim 1, wherein at least three of the splines are integrally formed on the surface of the driven end portion of the card-type flywheel drive; and wherein the at least three splines include a The driving side, the driving side includes a reinforced meshing member, and the reinforced meshing member includes a portion having a radius surface. For example, the cassette flywheel drive of claim 1, which further includes a reinforcing member having a hardness of at least HRC 56, and the reinforcing member is engaged with the reinforcing engaging member. The card-type flywheel drive of claim 1, wherein the reinforced engaging member is configured to axially receive a reinforced member and fix the reinforced member adjacent to the driving side of the spline. For example, the cassette flywheel drive of claim 1, which further includes a drive end portion connected to the cylindrical main body portion, the drive end portion including a plurality of coaxial cylindrical surfaces, wherein the drive end portion is connected to the cylindrical main body portion It is integrally formed of aluminum. A wheel hub assembly comprising: a drive end part of a card-type flywheel drive, the drive end part comprising: a plurality of coaxial cylindrical surfaces; A radially extending flange; a driven end portion of the card-type flywheel drive, which is connected to the driving end portion, the driven end portion includes: a cylindrical body portion, which extends integrally from the flange to the A distal end of a cassette flywheel driver; a plurality of axially extending convex splines spaced apart on the cylindrical body portion, wherein the splines define a plurality of channels between adjacent splines; wherein the flowers At least one of the keys is integrally formed on the surface of the driven end portion of the card-type flywheel driver; wherein the at least one spline includes a driving side, the driving side includes a spring clip, and wherein the spring clip gives a A spring force that abuts the opposite longitudinal surface of the adjacent spline. For example, the hub assembly of claim 10, which further includes a hub main body including an annular internal cavity extending from a first end of the hub main body to a second end of the hub main body, wherein the cassette flywheel The plurality of coaxial cylindrical surfaces of the driving end portion of the driver are positioned in the annular internal cavity of the hub body. Such as the hub assembly of claim 11, which further includes a plurality of wheel stop pads positioned between the annular inner cavity of the hub body and the driving end portion of a cassette flywheel driver. For example, the wheel hub assembly of claim 10, which further includes a plurality of spring clips engaged with one of the enhanced engagement members of the cassette flywheel driver. For example, the hub assembly of claim 10, which further includes: a one-piece hub body defining a longitudinal rotation axis, the hub body including a first end extending from the hub body to an opposite second end of the hub body An internal cavity, the hub body including a first radially extending spoke support flange located at the first end of the hub body and a second radially extending spoke support flange located at the second end of the hub body Spoke support flange; an axle including a first end portion and a second end portion, the axle extending through the inner cavity of the hub body in a coaxial configuration; a first bearing set positioned on the axle At the first end portion, the first bearing set is configured to interface between the axle and the hub body to promote relative rotation between the axle and the hub body; wherein the cassette flywheel drive includes and The longitudinal rotation axis of the hub body is coaxially arranged with a longitudinal rotation axis, the card-type flywheel drive includes an internal cavity extending from a driving end to a relatively driven end, wherein the driving end includes: an annular opening, which is positioned Between the first radially extending spoke support flange and the second radially extending spoke support flange in the hub body, the second end portion of the axle extends through the annular opening; a first outer cylindrical shape A surface located at a first diameter from the longitudinal axis of rotation of the cassette flywheel drive; a second outer cylindrical surface located at a second diameter from the longitudinal axis of rotation of the cassette flywheel drive, The second diameter is greater than the first diameter, and the second outer cylindrical surface is closer to the driven end of the cassette flywheel drive than the first outer cylindrical surface; A third outer cylindrical surface positioned at a third diameter from the longitudinal axis of rotation of the cassette flywheel drive, the third diameter is greater than the second diameter, and the third outer cylindrical surface is larger than the second outer The cylindrical surface is closer to the driven end; a second bearing set is positioned at the second end portion of the axle, and the second bearing set is configured to interface between the axle and the cassette flywheel drive Between the internal cavities to promote the relative rotation between the axle and the cassette flywheel drive; a third bearing set positioned on the first outer cylindrical surface of the driven end of the cassette flywheel drive and Between the inner cavity of the hub body to promote relative rotation between the cassette flywheel driver and the hub body; a fourth bearing set positioned at the third outer portion of the driven end of the cassette flywheel driver Between the cylindrical surface and the inner cavity of the hub body, the fourth bearing set is configured to promote the relative rotation between the card-type flywheel driver and the hub body; an anti-wheel washer sleeve, which is pressed to the A portion of the hub body is radially aligned with a part of the second outer cylindrical surface of the driven end of the cassette flywheel driver, wherein the stop washer sleeve has one that is harder than the surface of the inner cavity of the hub body An inner surface; and an annular stop washer cage having the second outer cylindrical surface that is biased by tension against the driven end of the cassette flywheel drive and radially aligned with the stop washer sleeve Plural stop wheel pads. A method of manufacturing a wheel hub assembly, the method comprising: machining a cassette flywheel drive from an aluminum body; wherein the machining step includes forming a driving end portion and a driven end portion, wherein the driving end portion includes a plurality of Coaxial cylindrical surface and the driven end portion includes a cylindrical body portion, the cylindrical body portion includes spaced apart on the cylindrical body portion A plurality of axially extending convex splines, wherein the splines define a plurality of channels between adjacent splines; wherein the at least one spline includes a driving side, the driving side includes a reinforced engagement member, and further includes A step of axially sliding a compression spring clip into engagement with the strengthened engagement member.

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