TW202009172A - Drivetrain for bicycle and structure of chainring installation thereof - Google Patents

Abstract

A structure of chainring installation includes a crank, a spindle, and a swing assembly. The spindle includes a first rotation axis, and one end of the spindle is connected to the crank. The crank drives the spindle to rotate about the first rotation axis. The swing assembly is disposed at one end of the spindle adjacent to the crank without contact with the crank. The swing assembly can shift axially relative to the spindle. The swing assembly includes a second rotation axis that crosses the first rotation axis. The swing assembly can rotate about the second rotation axis.

Description

Bicycle transmission system and its gear mounting structure

The invention relates to a bicycle, and relates to a bicycle drivetrain and its gear mounting structure.

At present, commercially available shift bicycles have, for example, the transmission system shown in FIG. 1. Please refer to FIG. 1, which illustrates a schematic top view of a transmission system 100 for a conventional variable speed bicycle. The transmission system 100 in FIG. 1 belongs to a 1X transmission system, and includes a chain 110, a rear flywheel 120 and a front sprocket 130. The front chainring 130 is a single-piece chainring, and is connected to a crank (not shown), and the rear flywheel 120 has a plurality of sprockets 121 stacked on each other, and is connected to a rear wheel (not shown).

The sizes of these sprockets 121 are different from each other. From FIG. 1, the sprockets 121 are arranged in order from the largest to the smallest from top to bottom, so the top sprocket 121 in FIG. 1 has the largest diameter, and the bottom sprocket 121 in FIG. 1 has the smallest diameter. The chain 110 meshes with the rear flywheel 120 and the front sprocket 130, and has a deflection, so that the chain 110 can bend along the rotation axis A12 of the rear flywheel 120 and the rotation axis A13 of the front sprocket 130. In this way, the chain 110 can be selectively engaged with one of the sprockets 121 to achieve the function of speed change.

However, the chain 110 bent along the rotation axis A12 and the rotation axis A13 generates lateral stress, which causes friction between the rear flywheel 120 and the front sprocket 130 and the chain 110. The greater the amplitude of the chain 110 bending (along the direction of the rotation axis A12 and the rotation axis A13), the greater the above-mentioned lateral stress, thereby generating greater friction. Once the friction is greater than a certain level, not only will it make a lot of noise when riding a bicycle, but it will also accelerate the wear of the chain 110, the rear flywheel 120 and the front sprocket 130, and may even increase the chain 110 from the rear flywheel 120 Or the risk of front chainring 130.

The invention provides a gear plate mounting structure, which utilizes the axial deflection generated between the deflection assembly and the mandrel to reduce the above-mentioned frictional force.

The cogging installation structure provided by the present invention includes a crank, a mandrel and a yaw assembly. The mandrel includes a first rotating shaft, and one end of the mandrel is connected to the crank. The crank drives the mandrel so that the mandrel rotates around the first rotation axis. The yaw assembly is sleeved on one end of the mandrel close to the crank and does not contact the crank. The yaw assembly generates an axial yaw with respect to the mandrel, and includes a second rotation shaft and pivots about the second rotation shaft, wherein the second rotation shaft passes through the first rotation shaft.

In an embodiment of the invention, the first rotation axis is located on a plane. This plane is a horizontal plane, and there is an angle between the second rotation axis and the plane.

In an embodiment of the invention, the included angle is an acute angle.

In an embodiment of the invention, the included angle is greater than 30 degrees and less than 90 degrees.

In an embodiment of the invention, the deflection assembly includes a first sleeve, a second sleeve, and a third sleeve. The first sleeve is connected to the radial inner peripheral edge of the third sleeve by a radial outer peripheral edge, and is sleeved on the mandrel by a radial inner peripheral edge located on the opposite side. The radial outer periphery of the second sleeve is connected to the gear disc, and the radial inner periphery of the third sleeve is connected to the radial outer periphery of the third sleeve. The third sleeve is disposed between the first sleeve and the second sleeve.

In an embodiment of the invention, the deflection assembly includes an intermediary member. The intermediary member is disposed between the first sleeve and the third sleeve, so that the first sleeve rotates relative to the third sleeve.

In an embodiment of the invention, the intermediary member is a bearing.

In an embodiment of the invention, the third sleeve includes two pivotal portions. The two pivoting portions are symmetrically disposed on the outer periphery of the third sleeve, and the second rotating shaft passes through the two pivoting portions, so that the yaw assembly pivots around the second rotating shaft.

In an embodiment of the invention, the deflection assembly includes a fixing frame. The outer periphery of the fixing frame is provided with two connecting portions extending in the axial direction and at least one mounting portion extending in the radial direction. The two connecting portions are sleeved on the two pivoting portions of the third sleeve, and at least one mounting portion is locked to a bicycle frame.

In an embodiment of the invention, the mandrel is provided with a flange portion toward the outer periphery of the crank, and the flange portion is provided with a plurality of first guide grooves. The inner periphery of the first sleeve is provided with a plurality of second guide grooves, wherein the deflection assembly further includes a sliding member. The slider is installed between the first guide groove and the second guide groove, so that the yaw assembly moves axially relative to the mandrel.

In an embodiment of the invention, the first guide groove and the second guide groove are parallel to the first rotation axis.

In an embodiment of the invention, the first guide groove and the second guide groove are not parallel to the first rotation axis.

In an embodiment of the invention, the sliding member includes a plurality of balls, and the balls are correspondingly installed between the first guide grooves and the second guide grooves.

In an embodiment of the invention, the mandrel is provided with a rib portion toward the crank. The rib portion includes a plurality of ribs arranged radially along the outer periphery of the mandrel. The inner periphery of the first sleeve is provided with a plurality of first guide grooves, wherein the deflection assembly further includes a plurality of sliding members. The sliders are correspondingly mounted on the convex ribs, and the convex ribs are correspondingly mounted on the first guide grooves, so that the yaw assembly moves axially relative to the mandrel.

In an embodiment of the invention, the sliding member is a rotor.

In an embodiment of the invention, the deflection assembly further includes a limit ring. The limiting ring is disposed between the first sleeve and the convex rib. The configuration of the limit ring cooperates with the first sleeve and the convex rib portion, so that the deflection assembly is restricted to move axially relative to the mandrel.

In an embodiment of the invention, the limit ring includes a plurality of second guide grooves and blocking portions. The second guide grooves are sleeved on the ribs correspondingly. The configuration of the stopper part cooperates with the first guide groove of the first sleeve.

In an embodiment of the invention, the mandrel is provided with a detent portion toward the crank. The pawl portion includes a plurality of bases and a plurality of pawls arranged radially along the outer periphery of the mandrel. The pawls are pivotally connected to the bases correspondingly, and each pawl is provided with a convex rib. The inner periphery of the first sleeve is provided with a plurality of guide grooves, wherein the pawl portion further includes a plurality of sliding members. The sliders are correspondingly installed on the convex ribs, and the convex ribs are correspondingly installed between the guide grooves, so that the yaw assembly moves axially relative to the mandrel.

In an embodiment of the invention, the sliding member is a rotor.

In an embodiment of the present invention, the above-mentioned gear mounting structure further includes an elastic member. The elastic member is sleeved on the mandrel close to the pawl portion. The elastic member extends radially with a plurality of elastic portions, and the elastic portions correspondingly abut the pawls.

The transmission system provided by the present invention includes a crank, a mandrel, a yaw assembly, a rear sprocket, and a transmission part. The mandrel includes a first rotating shaft, and one end of the mandrel is connected to the crank. The crank drives the mandrel to rotate relative to the first rotation axis. The yaw assembly is sleeved on one end of the mandrel close to the crank and does not contact the crank, so that the yaw assembly produces an axial yaw relative to the mandrel. The yaw assembly includes a front sprocket and a second rotating shaft, wherein the second rotating shaft passes through the first rotating shaft. The rear sprocket includes a third rotation shaft, and the transmission member meshes with the front sprocket and the rear sprocket, wherein the first rotation shaft and the third rotation shaft are located in a common plane, and the second rotation shaft and the common plane have an included angle.

In an embodiment of the invention, the included angle is an acute angle.

In an embodiment of the invention, the included angle is greater than 30 degrees and less than 90 degrees.

Based on the above, since the yaw assembly can pivot with the second rotating shaft as the axis, the yaw assembly can generate an axial yaw relative to the mandrel. In this way, it can help reduce lateral stress and friction, thereby reducing the noise and wear of the transmission parts during riding.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below, and in conjunction with the accompanying drawings, detailed descriptions are as follows.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following embodiments with reference to the drawings. In addition, the directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only the directions referring to the attached drawings. Therefore, the directional terminology used is only for illustration, to help people with common knowledge in the technical field to which the present invention belongs understand the features and effects of the present invention, and is not intended to limit the present invention.

FIG. 2A is a perspective schematic view of a cogging installation structure according to an embodiment of the present invention, and FIG. 2B is an exploded schematic view of the cogging installation structure in FIG. 2A. Please refer to FIG. 2A and FIG. 2B, the gear mounting structure 200 includes a crank 210 and a mandrel 220. The mandrel 220 includes a first rotation axis R1, which is substantially equal to the axis of the mandrel 220, and one end of the mandrel 220 is connected to the crank 210. When the crank 210 rotates along the first rotation axis R1, the crank 210 can drive the mandrel 220 so that the mandrel 220 rotates around the first rotation axis R1.

The cogging mounting structure 200 further includes a yaw assembly 230, and the yaw assembly 230 is sleeved on one end of the mandrel 220 near the crank 210, wherein the yaw assembly 230 does not contact the crank 210 and is movably sleeved on the mandrel 220 That is, the yaw assembly 230 can move relative to the mandrel 220. The yaw assembly 230 includes a second rotation axis R2, and pivots about the second rotation axis R2 as an axis, so that the yaw assembly 230 can yaw relative to the mandrel 220, wherein the second rotation axis R2 rotates through the first The axis R1, that is, the second rotation axis R2 intersects the first rotation axis R1. The yaw assembly 230 is connected to the gear wheel 240, and the gear wheel 240 may be a front gear wheel of the bicycle and can engage a transmission member such as a chain or a belt.

When the crank 210 rotates along the first rotation axis R1, the mandrel 220 also rotates accordingly, and drives the yaw assembly 230 so that the yaw assembly 230 rotates with the first rotation axis R1 as the axis. The rotating yaw assembly 230 can drive the gear wheel 240 to rotate, and the rotating gear wheel 240 can drive a transmission member (such as a chain), and use the transmission member to transmit power to the rear flywheel of the bicycle, thereby allowing the bicycle to move. Since the yaw assembly 230 can pivot about the second rotation axis R2, the yaw assembly 230 can be driven by the transmission member to yaw relative to the mandrel 220 during the process of riding a bicycle and performing speed change. Reduce the friction between the rear flywheel and the gear 240 and the transmission, reduce the noise generated during riding and the wear of the transmission and the gear.

The yaw assembly 230 further includes a fixing frame 250, and the fixing frame 250 can be fixed to the bicycle frame, so that the gear mounting structure 200 can be installed on the bicycle. In the embodiment shown in FIGS. 2A and 2B, the outer periphery of the fixing frame 250 is provided with at least one mounting portion 251 extending radially. Taking FIGS. 2A and 2B as an example, the fixing frame 250 has three mounting portions 251, but the number of the mounting portions 251 disclosed in FIGS. 2A and 2B is not limited to this embodiment. The mounting portions 251 each have an opening (not shown) for screw insertion, so that the mounting portions 251 can be locked to the bicycle frame. In other words, in the embodiments shown in FIGS. 2A and 2B, the fixing frame 250 is fixed to the frame by means of locking. However, in other embodiments, the fixing frame 250 can also be fixed to the frame by other technical means, such as welding or riveting. Therefore, the fixing means between the fixing frame 250 and the vehicle frame is not limited to only locking.

Fig. 2C is a schematic side view of the mounting structure of the cog in Fig. 2A. 2B and 2C, the deflection assembly 230 further includes a first sleeve 231, a second sleeve 232, and a third sleeve 233. The first sleeve 231, the second sleeve 232, and the third sleeve 233 are arranged substantially concentrically with each other, wherein the third sleeve 233 is disposed between the first sleeve 231 and the second sleeve 232. In detail, the radial outer peripheral edge of the first sleeve 231 is connected to the radial inner peripheral edge of the third sleeve 233, and the first sleeve 223a is sleeved with the radial inner peripheral edge on the opposite side of the radial outer peripheral edge The shaft 220, so the first sleeve 231 surrounds the mandrel 220 and is located between the mandrel 220 and the third sleeve 233. The radial outer peripheral edge of the second sleeve 232 is connected to the gear plate 240, and the second sleeve 232 is connected to the radial outer peripheral edge of the third sleeve 233 with a radial inner peripheral edge on the opposite side of the radial outer peripheral edge. The second sleeve 232 surrounds the third sleeve 233.

The third sleeve 233 can be pivotally connected to the fixing frame 250. Specifically, the third sleeve 233 includes two pivotal portions 2331, and the outer periphery of the fixing frame 250 is provided with two connecting portions 252 extending axially. Each pivoting portion 2331 can be a protruding column, and each connecting portion 252 can have an opening, wherein the pivoting portions 2331 can pass through the openings of these connecting portions 252, so that the two connecting portions 252 are sleeved on the third Two pivot portions 2331 of the sleeve 233. In addition, the two pivoting portions 2331 are point-symmetrically arranged on the outer periphery of the third sleeve 233, so the second rotation axis R2 will pass through the axis of the third sleeve 233, so that the yaw assembly 230 can use the second The rotation axis R2 is an axis and pivots relative to the fixing frame 250.

The yaw assembly 230 may further include an intermediate member 234, which may be a bearing, as shown in FIG. 2B. In the embodiment shown in FIG. 2B, the intermediate member 234 includes an assembly ring 234a and a plurality of balls 234b, wherein the balls 234b are mounted on the assembly ring 234a. The intermediary member 234 is disposed between the first sleeve 231 and the third sleeve 233, and the balls 234 b contact the radial outer periphery of the first sleeve 231 and the radial inner periphery of the third sleeve 233. When the first sleeve 231 rotates, although the third sleeve 233 does not rotate with the first sleeve 231 due to the pivotal connection with the fixing frame 250, the intermediary member 234 can make the first sleeve 231 relative to the third sleeve 233 The rotation prevents the rotation of the first sleeve 231 from being interfered by the third sleeve 233.

The intermediary member 234 can also limit the relative displacement between the first sleeve 231 and the third sleeve 233 to stabilize the rotating first sleeve 231 and thereby prevent the first sleeve 231 from detaching from the third sleeve 233. In addition, the first rotation axis R1 may be located on the plane CP1, which may be a horizontal plane. The angle θ1 between the second rotation axis R2 and the plane CP1 is an acute angle, so the first rotation axis R1 is obviously not perpendicular to the plane CP1 (horizontal plane), where the angle θ1 may be greater than 30 degrees and less than 90 degrees.

The yaw assembly 230 may further include a slider 235, wherein the slider 235 is installed between the mandrel 220 and the first sleeve 231. The sliding member 235 may include a limit ring 235a and a plurality of balls 235b. The limit ring 235a may have a plurality of openings (not shown), and the balls 235b may be respectively disposed in the openings of the limit ring 235a. In addition, in this embodiment, the balls 235b are disposed in the grooves of both the mandrel 220 and the first sleeve 231, so that the balls 235b can be confined between the mandrel 220 and the first sleeve 231.

In detail, the mandrel 220 is provided with a flange portion 221 toward the outer periphery of the crank 210, and the flange portion 221 is provided with a plurality of first guide grooves 2211, and the inner periphery of the first sleeve 231 is provided with a plurality of Two guide grooves 2311, wherein these first guide grooves 2211 and second guide grooves 2311 can be parallel to the first rotation axis R1 (as shown in FIG. 2B), so the first guide groove 2211 and its corresponding second guide groove The extending directions of both the guide grooves 2311 may be the same as each other. The balls 235b of the slider 235 are correspondingly installed between the first guide grooves 2211 and the second guide grooves 2311, so that the balls 235b can be guided by the first guide grooves 2211 and the second guide grooves 2311 And the limit ring 235a is limited and it is difficult to separate from the first sleeve 231 from the mandrel 220.

FIG. 2D is a schematic cross-sectional perspective view of the mounting structure of the chainring in FIG. 2A, wherein FIG. 2D is drawn along a plane CP1 in FIG. 2C. 2B and 2D, using the balls 235b of the sliding member 235, the first sleeve 231 can move relative to the mandrel 220, so that the yaw assembly 230 moves axially relative to the mandrel 220. Therefore, the yaw assembly 230 can move slightly relative to the mandrel 220 along the first rotation axis R1 to reduce the friction between the rear flywheel and the sprocket 240 and the transmission member, thereby effectively reducing noise and wear .

In addition, the balls 234b between the first guide groove 2211 and the second guide groove 2311 can transmit power, so that the mandrel 220 can drive the first sleeve 231. In detail, when the mandrel 220 rotates along the first rotation axis R1, the balls 235b between the first guide groove 2211 and the second guide groove 2311 can also rotate around the first rotation with the mandrel 220 The shaft R1 rotates, and these rotating balls 235b can drive the first sleeve 231 so that the first sleeve 231 can also rotate along the first rotation axis R1 along with the mandrel 220. In this way, the mandrel 220 rotating along the first rotation axis R1 can drive the yaw assembly 230 so that the yaw assembly 230 can rotate with the first rotation axis R1 as the axis.

It must be noted that, in the embodiment shown in FIG. 2B, the slider 235 includes a limit ring 235a, but in other embodiments, even if the slider 235 does not include the limit ring 235a, the first guide groove 2211 and the second The second guide groove 2311 also has the function of limiting the balls 235b, so that the balls 235b are not easily separated from the mandrel 220 and the first sleeve 231, and the balls 235b can also transmit power, so that the yaw assembly 230 can be used by the mandrel 220 Driven to rotate along the first rotation axis R1. Therefore, the sliding member 235 may not include the limiting ring 235a, that is, the sliding member 235 does not necessarily include the limiting ring 235a.

2E and 2F are schematic cross-sectional diagrams in FIG. 2C, where both FIG. 2E and FIG. 2F are drawn along the plane 2E in FIG. 2C. 2B, 2E, and 2F, the yaw assembly 230 can pivot relative to the fixing frame 250 with the second rotation axis R2 as the axis, and the yaw assembly 230 does not contact the crank 210, so the yaw assembly 230 A movable gap G1 is formed with the crank 210. As shown in FIGS. 2E and 2F, the pivoting of the yaw assembly 230 relative to the fixing frame 250 will not be interfered by the crank 210. In addition, the intermediary member 234 can prevent the rotation of the first sleeve 231 from being interfered by the third sleeve 233. When riding a bicycle and shifting gears, the yaw assembly 230 can swing along the second rotation axis R2, so that the gear plate 240 can be driven by a transmission member (such as a chain) to produce an axial yaw relative to the mandrel 220. In order to reduce the friction between the rear flywheel and the gear wheel 240 and the transmission member, the noise generated during riding and the wear of the transmission member are reduced.

FIG. 3 is an exploded schematic view of a gear mounting structure of another embodiment of the present invention. Please refer to FIG. 3, the gear mounting structure 300 is similar to the gear mounting structure 200 of the foregoing embodiment. For example, both also include the same elements and have the same effect. The following mainly describes the differences between the tooth disc mounting structures 300 and 200, and the same technical features will not be repeated in principle.

The gear mounting structure 300 includes a mandrel 320 and a yaw assembly 330. The outer periphery of the mandrel 320 is provided with a flange portion 321, and the flange portion 321 is provided with a plurality of first guide grooves 3211. The yaw assembly 330 includes a first sleeve 331, and corresponding to the first guide grooves 3211, a plurality of second guide grooves 3311 are provided on the inner periphery of the first sleeve 331, wherein each of the first guide grooves 3211 is The extension directions of the corresponding second guide grooves 3311 may be the same as each other. However, it is different from the first guide groove 2211 and the second guide groove 2311 in FIG. 2B. It is obvious from FIG. 3 that the first guide grooves 3211 and the second guide grooves 3311 are not parallel to the first One rotation axis R1. In addition, the yaw assembly 330 in FIG. 3 further includes a sliding member, which is also installed between the mandrel 320 and the first sleeve 331, wherein the sliding member includes a plurality of balls 335. However, unlike the slider 235 in FIG. 2B, the slider in FIG. 3 includes only these balls 335, and does not include other elements, such as the limit ring 235a in FIG. 2B.

FIG. 4A is a perspective schematic view of a cogging installation structure according to another embodiment of the present invention, and FIG. 4B is an exploded schematic view of the cogging installation structure in FIG. 4A. Please refer to FIG. 4A and FIG. 4B. The gear mounting structure 400 of this embodiment is similar to the gear mounting structure 200 of the foregoing embodiment. For example, the gear mounting structure 400 also includes a mandrel 420 and a yaw assembly 430, the center axis 420 of which can rotate about the first rotation axis R1, and the yaw assembly 430 also includes a fixing frame 250 and a third sleeve 233. The fixing frame 250 is pivotally connected to the third sleeve 233 so that the yaw assembly 430 can yaw relative to the mandrel 420 using the second rotation axis R2 as the axis, wherein the second rotation axis R2 passes through the first rotation axis R1. However, unlike the cogging mounting structure 200 in the foregoing embodiment, the mandrel 420 is provided with a convex rib portion 421 toward the crank 210, and the convex rib portion 421 includes a plurality of radially arranged along the outer periphery of the mandrel 420 Convex rib 4211. Taking FIG. 4B as an example, the convex ribs 4211 are arranged radially and extend radially outward from the outer periphery of the mandrel 420.

4C is a partially enlarged schematic view of the rib portion of the spur mounting structure in FIG. 4B. 4B and 4C, the deflection assembly 430 includes a plurality of sliding members 435, and the sliding members 435 are correspondingly mounted on the ribs 4211. The slider 435 may be a rotor, so the shape of the slider 435 is a hollow cylinder, and the slider 435 has a through hole (not shown). The sliders 435 are correspondingly mounted on the ribs 4211, that is, the through holes of the sliders 435 are respectively inserted by the ribs 4211, so the slider 435 can spin relative to the ribs 4211.

The yaw assembly 430 further includes first sleeves 431, and the inner circumference of the first sleeve 431 is provided with a plurality of first guide grooves 4311, wherein the ribs 4211 are mounted on the first sleeves corresponding to the sliding members 435导槽4311。 Guide groove 4311. Since the sliding member 435 can rotate with respect to the convex rib 4211, these convex ribs 4211 and the sliding member 435 installed in the first guide groove 4311 can cause the yaw assembly 430 to move axially relative to the mandrel 420, thereby helping The yaw assembly 430 is yawed relative to the mandrel 420.

Fig. 4D is a schematic side view of the mounting structure of the cog in Fig. 4A. Please refer to FIGS. 4B to 4D. Unlike the second guide groove 2311 in FIG. 2B described above, each first guide groove 4311 in FIG. 4B has a notch 4312, wherein these notches 4312 can be formed in the first sleeve 431 On the same side, the ribs 421 and the sliders 435 can be inserted into the first guide grooves 4311 from the notches 4312. In addition, in the embodiments shown in FIGS. 4B and 4C, the mandrel 420 and the crank 210 may be two independent components.

The yaw assembly 430 further includes a limit ring 436, which is sleeved between the first sleeve 431 and the convex rib portion 421, wherein the configuration of the limit ring 436 cooperates with the first sleeve 431 and the convex rib portion 421 to The yaw assembly 430 is restricted to move axially relative to the mandrel 420. Specifically, the stop ring 436 may include a plurality of second guide grooves 4361 and a stop portion 4362, wherein the second guide grooves 4361 are correspondingly sleeved on the ribs 4211 and the slider 435, that is, the protrusions The rib 4211 and the sliders 435 are located in the second guide grooves 4361, respectively. Each second guide groove 4361 may be a bottomless opening, so the ribs 4211 can penetrate the stop ring 436 from the second guide grooves 4361 respectively.

The shape of the stop portion 4362 is substantially ring-shaped, and these second guide grooves 4361 extend axially from the side of the stop portion 4362 toward the crank 210. After the limit ring 436 is sleeved between the first sleeve 431 and the rib portion 421, the configuration of the stop portion 4362 is engaged with the first guide groove 4311 of the first sleeve 431. Taking FIGS. 4B and 4C as examples, the stop portion 4362 has a plurality of protrusions (not shown) arranged radially along the outer periphery of the stop ring 436, wherein the shape of the protrusion matches the shape of the notch 4312, so that These bumps are filled in these notches 4312, respectively. In this way, the configuration of the stop portion 4362 can cooperate with the first guide groove 4311 of the first sleeve 431.

4E is a schematic cross-sectional view taken along line 4E-4E in FIG. 4D. Please refer to FIGS. 4D and 4E. In the gear mounting structure 400, since the ribs 4211 are installed in the first guide grooves 4311, respectively, the ribs 4211 can also transmit power so that the mandrel 420 can be driven First sleeve 431. When the mandrel 420 rotates along the first rotation axis R1, the ribs 4211 and the slider 435 can also rotate around the first rotation axis R1 along with the mandrel 420. Therefore, the ribs 4211 can drive the first sleeve 431 so that the first sleeve 431 can also rotate along the first rotation axis R1 along with the mandrel 420. In this way, the mandrel 420 rotating along the first rotation axis R1 can rotate the yaw assembly 430 about the first rotation axis R1 as the axis.

The yaw assembly 430 can also pivot relative to the fixing frame 250 with the second rotation axis R2 as the axis, wherein the yaw assembly 430 also does not contact the crank 210. Therefore, the crank 210 does not substantially interfere with the relative pivot between the yaw assembly 430 and the fixing frame 250. Secondly, the rib 4211 and the slider 435 can cause the yaw assembly 430 to move axially relative to the mandrel 420. In addition, the gear mounting structure 400 also includes an intermediary member 234, which can prevent the rotation of the first sleeve 431 from being interfered by the third sleeve 233, so that the mandrel 420 can smoothly drive the rotation of the first sleeve 431. In this way, when riding a bicycle and shifting gears, the yaw assembly 430 can swing along the second rotation axis R2, so that the gear plate 240 can be driven by a transmission member (such as a chain) to produce an axial deviation relative to the mandrel 420 Pendulum to reduce the friction between the rear flywheel and the sprocket 240 and the transmission member.

FIG. 5A is a perspective schematic view of a cogging installation structure according to another embodiment of the present invention, and FIG. 5B is an exploded schematic view of the cogging installation structure in FIG. 5A. Please refer to FIG. 5A and FIG. 5B. The gear mounting structure 500 of this embodiment is similar to the gear mounting structure 400 of the foregoing embodiment. For example, the gear mounting structures 500 and 400 include the same components, and the two have the same effect. The main difference between the two is that the structure of the mandrel 520 included in the gear mounting structure 500 is different from the structure of the mandrel 420 in the foregoing embodiment. The following mainly describes the differences between the gear mounting structures 500 and 400, and the same technical features will not be repeated in principle.

The cogging mounting structure 500 includes a yaw assembly 530, and the yaw assembly 530 includes a first sleeve 531, wherein a plurality of guide grooves 5311 are provided on the inner periphery of the first sleeve 531. In the gear mounting structure 500, the mandrel 520 is provided with a pawl portion 521 toward the crank 210, and the pawl portion 521 is installed in the guide groove 5311, so the first sleeve 531 surrounds the pawl portion 521. The pawl portion 521 can cause the yaw assembly 530 to move axially relative to the mandrel 520, thereby helping the yaw assembly 530 to yaw relative to the mandrel 520.

FIG. 5C is a partially enlarged schematic view of the cogging mounting structure in FIG. 5B at its pivoting portion, and FIG. 5D is an exploded schematic view of the cogging mounting structure in FIG. 5C at its pivoting portion. 5C and 5D, in the embodiment shown in FIGS. 5C and 5D, the pawl portion 521 may include a plurality of bases 5211 and a plurality of pawls 5212 arranged radially along the outer periphery of the mandrel 520, The pawls 5212 are pivotally connected to the bases 5211 correspondingly. Each pawl 5212 is provided with a convex rib 5213, wherein the convex rib 5213 is located at the top end of the pawl 5212, as shown in FIG. 5C. The pawl portion 521 may further include a plurality of sliders 5214, which are, for example, rotors. The sliders 5214 are correspondingly mounted on the ribs 5213 so that the slider 5214 can rotate relative to the ribs 5213.

The ribs 5213 are installed between the guide grooves 5311 corresponding to the sliders 5214, so that the pawl portion 521 can be installed in the guide grooves 5311. Since the sliding member 5214 can rotate with respect to the rib 5213, the ribs 5213 and the sliding member 5214 installed in the guide groove 5311 can cause the yaw assembly 530 to move axially relative to the mandrel 520, thereby helping to bias The pendulum assembly 530 deflects relative to the mandrel 520. In addition, the gear mounting structure 500 may further include an elastic member 560. The elastic member 560 is sleeved on the mandrel 520 near the pawl portion 521, and the elastic member 560 radially extends a plurality of elastic portions 561. The elastic portions 561 abut against the pawls 5212 correspondingly, so that the sliders 5214 and the ribs 5213 of the pawls 5212 can be held in the guide grooves 5311, thereby preventing the sliders 5214 and the ribs 5213 from leaving导槽5311.

In addition, since the sliders 5214 and the ribs 5213 of the pawls 5212 are installed in the guide grooves 5311, respectively, the pawl portion 521 can also transmit power so that the mandrel 520 can drive the first sleeve 531. When the mandrel 520 rotates along the first rotation axis R1, the pawl portion 521 can also rotate around the first rotation axis R1 along with the mandrel 520, and can drive the first sleeve 531 to make the first sleeve 531 can also rotate along the first rotation axis R1 along with the mandrel 520. In this way, the mandrel 520 can also rotate the yaw assembly 530 about the first rotation axis R1 as the axis.

6 is a schematic side view of a bicycle equipped with a transmission system according to an embodiment of the present invention. Referring to FIG. 6, the transmission system 600 of this embodiment may be installed on the bicycle 60 and may include the cogging installation structure 200, 300, 400, or 500 disclosed above. Therefore, the transmission system 600 includes a crank 210, a mandrel (covered by the crank 210 and not shown), and a yaw assembly 630, the central axis of which includes the first rotation axis R1, and the yaw assembly 630 may be the above yaw assembly 230 , 330, 430 and 530. Therefore, the yaw assembly 630 includes a front sprocket (for example, the sprocket 240 in the above embodiment) and a second rotation axis R2, and can pivot about the second rotation axis R2, wherein the second rotation axis R2 passes through the second One rotation axis R1.

The transmission system 600 further includes a rear sprocket 650 and a transmission member 640, wherein the transmission member 640 meshes with the front and rear sprockets 650, and may be a chain or a belt, and the rear sprocket 650 includes a third rotating shaft R3. When the crank 210 rotates along the first rotation axis R1, the front chainring rotates along with the crank 210 to drive the transmission member 640. The transmission member 640 driven by the front chainring can transmit power to the rear chainring 650 so that the rear chainring 650 can rotate with the third rotation axis R3 as the axis. In this way, the rear wheel of the bicycle 60 can be rotated, allowing the bicycle 60 to move in the past.

The first rotation axis R1 and the third rotation axis R3 are located in the coplanar CP2, and the second rotation axis R2 and the coplanar CP2 have an included angle θ2, which may be an acute angle, wherein the included angle θ2 may be greater than 30 degrees and less than 90 degrees. Therefore, the second rotation axis R2 is not perpendicular to the co-planar CP2, and a rake angle θ3 can be formed, as shown in FIG. 6. With the drag angle θ3, the yaw assembly 630 can be stabilized so that the yaw assembly 630 does not yaw relative to the mandrel along the second rotation axis R2 too frequently. In this way, the transmission member 640 can stably mesh with the front and rear gear wheels 650, thereby reducing the risk of the transmission member 640 coming off the front or rear gear wheels 650.

In summary, in the transmission system and the gear plate mounting structure of the present invention, the yaw assembly connected to the gear plate can be movably sleeved on the mandrel and does not contact the crank, wherein the yaw assembly can use the second rotation axis R2 is the pivot of the axis, and can produce axial deflection relative to the axis. In this way, the yaw assembly of the present invention can help reduce lateral stress, reduce friction between the front and rear chainrings and the transmission member (such as a chain), and thereby reduce noise and wear of the transmission member when riding a bicycle.

Secondly, the second rotation axis R2 passes through the first rotation axis R1 of the mandrel, and the second rotation axis R2 is not perpendicular to the rotation axis of the front chainring (the first rotation axis R1) and the rotation axis of the rear chainring (the first Three rotation axes R3) The coplanar CP2 formed by the two, so the second rotation axis can form a drag angle θ3, wherein the drag angle θ3 can stabilize the yaw assembly so that the yaw assembly does not yaw too frequently. In this way, the transmission member can stably mesh with the front and rear gear wheels, reducing the risk of the transmission member disengaging from the front or rear gear wheels.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make some modifications and retouching without departing from the spirit and scope of the present invention. The scope of protection of invention shall be subject to the scope defined in the appended patent application.

CP1‧‧‧Plane 60‧‧‧Bike 100, 600‧‧‧ Transmission system 110‧‧‧Chain 120‧‧‧ Rear flywheel 121‧‧‧Sprocket 130‧‧‧ Front sprocket 200, 300, 400, 500‧ ‧‧Gear mounting structure 210‧‧‧Crank 220, 320, 420, 520 ‧‧‧ Mandrel 221, 321‧‧‧ Flange 2211, 3211, 4311 , 530, 630‧‧‧ yaw assembly 240 ‧‧Second sleeve 233‧‧‧Third sleeve 2331‧‧‧Pivot part 2311, 3311‧‧‧Second guide groove 234‧‧‧Intermediate 234a ‧‧Slider 235a‧‧‧Retaining rings 335, 234b, 235b ‧‧‧Ball 421 ‧‧‧‧rib ribs 4211, 5213‧‧‧rib ribs 4312 ‧Block part 4361‧‧‧Second guide groove 521‧‧‧Pawl part 5211‧‧‧Base 5212‧‧‧Pawl 5311‧‧‧Guide groove 560‧‧‧Elastic piece 561‧‧‧ Part 640‧‧‧ Transmission part 650‧‧‧Rear gear A12, A13‧‧‧Rotating shaft CP2‧‧‧Coplanar G1‧‧‧Movement clearance R1‧‧‧The first rotation axis R2 ‧‧‧ Third rotation axis θ1, θ2 ‧‧‧ included angle θ3 ‧‧‧ drag angle

FIG. 1 is a schematic side view of a transmission system of a conventional variable speed bicycle. FIG. 2A is a schematic perspective view of a mounting structure of a cog wheel according to an embodiment of the invention. Fig. 2B is an exploded schematic view of the mounting structure of the cog in Fig. 2A. Fig. 2C is a schematic side view of the mounting structure of the cog in Fig. 2A. FIG. 2D is a schematic cross-sectional perspective view of the mounting structure of the gear plate in FIG. 2A. 2E and 2F are schematic cross-sectional views in FIG. 2C. FIG. 3 is an exploded schematic view of a gear mounting structure of another embodiment of the present invention. 4A is a schematic perspective view of a mounting structure of a cog wheel according to another embodiment of the present invention. 4B is an exploded schematic view of the mounting structure of the cog wheel in FIG. 4A. 4C is a partially enlarged schematic view of the rib portion of the spur mounting structure in FIG. 4B. Fig. 4D is a schematic side view of the mounting structure of the cog in Fig. 4A. 4E is a schematic cross-sectional view taken along line 4E-4E in FIG. 4D. FIG. 5A is a perspective schematic view of a mounting structure of a cog wheel according to another embodiment of the present invention. FIG. 5B is an exploded schematic view of the mounting structure of the chainring in FIG. 5A. FIG. 5C is a partially enlarged schematic view of the mounting structure of the cogwheel in FIG. 5B at its pivoting portion. FIG. 5D is an exploded schematic view of the mounting structure of the cogwheel in FIG. 5C at its pivotal portion. 6 is a schematic side view of a bicycle equipped with a transmission system according to an embodiment of the present invention.

200‧‧‧Sprocket installation structure

210‧‧‧Crank

220‧‧‧mandrel

221‧‧‧Flange

2211‧‧‧First guide slot

230‧‧‧Swing components

240‧‧‧Sprocket

250‧‧‧Fixing frame

251‧‧‧Installation Department

252‧‧‧Connecting Department

231‧‧‧First sleeve

232‧‧‧Second sleeve

233‧‧‧The third sleeve

2331‧‧‧Pivot Department

2311‧‧‧Second guide slot

234‧‧‧Intermediary

235‧‧‧slide

234b, 235b‧‧‧ball

R1‧‧‧ First axis of rotation

R2‧‧‧second rotation axis

234a‧‧‧Assembly ring

235a‧‧‧Limit ring

Claims (23)

A gear mounting structure includes: a crank; a mandrel, including a first rotating shaft, one end of the mandrel is connected to the crank, the crank drives the mandrel, so that the mandrel uses the first rotating shaft as The shaft rotates; and a yaw assembly, sleeved on the mandrel near one end of the crank, and not in contact with the crank, wherein the yaw assembly produces an axial yaw relative to the mandrel, and includes a first The two rotating shafts pivot about the axis, and the second rotating shaft passes through the first rotating shaft. The cogging mounting structure according to claim 1, wherein the first rotation axis is located on a plane, the plane is a horizontal plane, and the second rotation axis has an angle with the plane. The gear mounting structure as described in claim 2, wherein the included angle is an acute angle. The cogging mounting structure according to claim 3, wherein the included angle is greater than 30 degrees and less than 90 degrees. The cogging mounting structure according to claim 1, wherein the yaw assembly includes a first sleeve, a second sleeve, and a third sleeve; the first sleeve has a radial outer periphery and One radial inner peripheral edge of the third sleeve is connected to the mandrel with a radial inner peripheral edge located on the opposite side; a radial outer peripheral edge of the second sleeve is connected to a tooth disc and A radial inner peripheral edge on the opposite side is connected to a radial outer peripheral edge of the third sleeve; the third sleeve is disposed between the first sleeve and the second sleeve. The cogging mounting structure according to claim 5, wherein the yaw assembly includes an intermediary member, the intermediary member is disposed between the first sleeve and the third sleeve, so that the first sleeve Relative to the third sleeve. The cogging mounting structure according to claim 6, wherein the intermediary member is a bearing. The chainring mounting structure according to claim 5, wherein the third sleeve includes two pivotal joints, the two pivotal joints are symmetrically disposed on the outer periphery of the third sleeve, and the second rotation The shaft passes through the two pivoting parts, so that the yaw assembly pivots around the second rotating shaft. The cogging installation structure according to claim 8, wherein the yaw assembly includes a fixing frame, and an outer periphery of the fixing frame is provided with two connecting portions extending axially and at least one mounting portion extending radially, the The two connecting portions are sleeved on the two pivoting portions of the third sleeve, and the at least one mounting portion is locked to a bicycle frame. The rack mounting structure as described in claim 9, wherein the mandrel is provided with a flange portion toward the outer periphery of the crank, and the flange portion is provided with a plurality of first guide grooves; A plurality of second guide grooves are provided on the inner periphery; wherein, the deflection assembly further includes a sliding member, and the slide member is installed between the first guide groove and the second guide groove to make the deflection The assembly moves axially relative to the mandrel. The chainring mounting structure according to claim 10, wherein the first guide groove and the second guide groove are parallel to the first rotation axis. The cogging mounting structure according to claim 10, wherein the first guide groove and the second guide groove are not parallel to the first rotation axis. The chainring mounting structure according to claim 10, wherein the sliding member includes a plurality of balls, and is correspondingly installed between the first guide grooves and the second guide grooves. The rack mounting structure according to claim 9, wherein the mandrel is provided with a convex rib portion toward the crank, and the convex rib portion includes a plurality of convex ribs arranged radially along the outer periphery of the mandrel; A plurality of first guide grooves are provided on the inner periphery of the first sleeve, wherein the deflection assembly further includes a plurality of sliding members, the sliding members are correspondingly mounted on the convex ribs, and the convex ribs are phased Correspondingly installed in the first guide grooves, so that the yaw assembly moves axially relative to the mandrel. The gear mounting structure as described in claim 14, wherein the sliding member is a rotor. The mounting structure for a cog wheel according to claim 14, wherein the deflection assembly further includes a limit ring, the limit ring is sleeved between the first sleeve and the convex rib, the limit ring The configuration cooperates with the first sleeve and the protruding rib portion to limit the axial movement of the yaw assembly relative to the mandrel. The rack installation structure as claimed in claim 16, wherein the limit ring includes a plurality of second guide grooves and a stop portion, and the second guide grooves are correspondingly sleeved on the convex ribs The configuration of the stopper part cooperates with the first guide groove of the first sleeve. The rack installation structure according to claim 9, wherein the mandrel is provided with a pawl portion toward the crank, and the pawl portion includes a plurality of bases and a plurality of bases arranged radially along the outer periphery of the mandrel A pawl, the pawls are pivotally connected to the bases correspondingly, and each pawl is provided with a rib; the inner periphery of the first sleeve is provided with a plurality of guide grooves; wherein, the pawl The part further includes a plurality of sliding members, the sliding members are correspondingly installed on the convex ribs, and the convex ribs are correspondingly installed between the guiding grooves, so that the deflection assembly is relative to the The mandrel produces axial movement. The cogging mounting structure according to claim 18, wherein the sliding member is a rotor. The chainring mounting structure according to claim 19, wherein the chainring mounting structure further includes an elastic member, the elastic member is sleeved on the mandrel close to the pawl portion, the elastic member extends radially An elastic portion corresponding to the pawls. A transmission system includes: a crank; a mandrel, including a first rotating shaft, one end of the mandrel is connected to the crank, the crank drives the mandrel to rotate relative to the first rotating shaft; a yaw assembly, sleeve The mandrel is disposed near one end of the crank and does not contact the crank, so that the yaw assembly generates an axial yaw relative to the mandrel. The yaw assembly includes a front gear plate and a second rotating shaft , The yaw assembly pivots about the second rotation axis as the axis, wherein the second rotation axis passes through the first rotation axis; a rear gear plate includes a third rotation axis; and a transmission member is engaged with the The front gear disc and the rear gear disc, wherein the first rotation axis and the third rotation axis are located in a common plane, and the second rotation axis and the common plane have an included angle. The transmission system according to claim 21, wherein the included angle is an acute angle. The transmission system according to claim 22, wherein the included angle is greater than 30 degrees and less than 90 degrees.

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