CN200993178Y - Hub ratchet device for increased escape resistance - Google Patents

Abstract

A hub ratchet device for increasing tripping resistance comprises a driven unit, a clutch unit and a driving unit. The driven unit comprises a driven seat capable of rotating, the clutch unit comprises a plurality of pawls pivoted in the driven seat, at least one elastic element continuously pushing the pawls to pop out of the driven seat, and a plurality of resistance pieces arranged in the driven seat. The driving unit comprises a ratchet wheel which can be rotatably arranged on the driven seat, the ratchet wheel is provided with a plurality of ratchet teeth for the unidirectional linkage of the pawl, and each ratchet tooth is provided with a tooth tip which can be contacted with the resistance piece. When a pedal mechanism of a bicycle is stopped temporarily due to failure, a large force generated by a rear wheel due to inertia can cause the resistance element to jump off the tooth tip, so as to drive the driven unit to rotate relative to the driving unit, thereby improving safety.

Description

Hub ratchet device for increased escape resistance

technical field

The utility model relates to a flower hub ratchet device, in particular to a flower hub ratchet device which increases the escape resistance.

Background technique

Traditional bicycles design the ratchet mechanism on the rear wheel, while the existing speed-changing bicycle 1 shown in Fig. 1 designs the ratchet mechanism on the body corresponding to the crank. A rear wheel 12 installed on the vehicle body 11, a front wheel 13 installed on the vehicle body 11 at a distance from the rear wheel 12, a transmission unit 14 installed on the rear wheel 12, and a transmission unit arranged on the vehicle body 11 and connected to the transmission unit The pedal mechanism 15 of 14. The pedal mechanism 15 includes a ratchet device 2 arranged on the vehicle body 11 between the front and rear wheels 13 and 12, two cranks 151 driven by the user, a sprocket wheel 152 arranged on the ratchet device 2, A chain 153 is hung on the sprocket 152 and the transmission unit 14 . The speed change unit 14 has a plurality of sprockets of different sizes, which can be used for the shifting and hanging of the chain 153 to achieve the purpose of speed change, and there is no ratchet mechanism between the speed change unit 14 and the rear wheel 12, and the two are integrated and linked relation.

Referring to Fig. 2 and Fig. 3, the ratchet device 2 has a spindle 21 which is rotatably arranged on the body 11 and whose two ends are affixed to the crank 151, a driving base 22 which can rotate with the spindle 21, a clutch unit 23 and a slave unit 24. The driving seat 22 has four limiting grooves 221 arranged around an outer peripheral surface, the clutch unit 23 includes four pawls 231 pivotally connected to the limiting grooves 221 respectively, and a part of the pawls 231 The elastic element 232 is continuously pushed out of the limiting slot 221 . The driven unit 24 includes a ratchet 241 that is rotatably mounted on the drive base 22 around the axis, the ratchet 241 has a body 242 for the sprocket 152 to be fixed, and a plurality of rings around the body 242. The inner peripheral surface is also a ratchet 243 for the one-way linkage of the pawl 231 .

1, 2 and 3, the user drives the crank 151 to rotate in a rotation direction 90, and the power is sequentially supplied by the spindle 21, the drive base 22, the pawl 231, the ratchet 243, the The body 242 , the sprocket 152 , the chain 153 , and the speed change unit 14 are finally transmitted to the rear wheel 12 to make the speed change bicycle 1 move forward. When the user does not drive the crank 151, the rear wheel 12 rotates due to the inertia of the speed change bicycle 1, and the power is sequentially transmitted by the speed change unit 14, the chain 153 of the pedal mechanism 15, the sprocket 152, the body 242, finally reaching the ratchet 243. Since the user prevents the crank 151 from rotating, the drive base 22 and the pawl 231 do not rotate around the axis, and the ratchet 243 jumps out and slides over the pawl along the rotation direction 90 with little resistance. 231.

The ratchet device 2 of the speed-changing bicycle 1 is installed on the body 11. Although this design can achieve the beneficial effect that the rider can still change the speed and have a sharper transmission response when the rider stops and slides, there is a hidden danger in safety, that is, when using When sliding without driving the crank 151, assuming that the ratchet 243 cannot escape from the pawl 231 when a certain pawl 231 fails, the chain 153 will be blocked immediately, and the rear wheel 12 will be blocked immediately. Also stop rotating immediately, as emergency braking, will cause this variable speed bicycle 1 to slip out of control, cause the not-so-good lack of safety.

And if also load onto ratchet mechanism (traditional ratchet rear flower hub) between this rear wheel 12 and speed-changing unit 14, break the relation of both integral interlocking, then when this chain 153 blocks suddenly, this rear wheel 12 can By means of the ratchet mechanism, there will be no emergency braking. Theoretically, this countermeasure can solve the aforementioned safety problems, but it destroys the basic function of "shifting speed while gliding". Because the rider must make the chain 153 continue to run when changing speeds, but the derailleur will give a resistance to the chain 153 when changing speeds, so the rear wheel 12 is very easy to jump off by the ratchet mechanism, making the chain 153 Stalled and shifting failure or loss of chain.

Therefore, how to improve the safety of the speed-changing bicycle 1 while maintaining the function of "shifting speed while skating" is really a problem to be solved urgently by the related industry.

Contents of the invention

The purpose of the utility model is to provide a hub ratchet device which can improve the safety and increase the escape resistance.

The hub ratchet device with increased escape resistance of the utility model is suitable for installation on a bicycle, and the bicycle includes a body, a rear wheel mounted on the body, a speed change unit, and a speed change unit arranged on the body and connected to the speed change unit pedal mechanism. The hub ratchet device with increased escape resistance includes a driven unit, a clutch unit, and a drive unit, wherein:

The driven unit is connected to the rear wheel, and includes a driven seat that rotates around an axis, and the driven seat has a plurality of limiting grooves and a plurality of resistance grooves arranged around an outer peripheral surface.

The clutch unit includes a plurality of pawls respectively located in the limiting grooves, at least one elastic element, and a plurality of resistance members respectively located in the resistance grooves. Each pawl has a pivoting portion pivotally connected to the limiting groove, and an engaging portion extending from the pivoting portion, and the elastic element continuously pushes the engaging portion out of the limiting groove.

The drive unit is connected to the transmission unit and includes a ratchet wheel that is rotatably mounted on the driven seat around the axis. The ratchet wheel has a body and a plurality of ratchet teeth that are arranged around an inner peripheral surface of the body. Each ratchet has a pushing surface that can be driven by the engaging portion, a pressing surface that can push the engaging portion toward the limiting groove, and a tooth that connects the pushing surface and the pressing surface and can touch the resistance member tip.

The beneficial effect of the utility model is that when the pedal mechanism fails and stops abnormally, the huge force generated by the inertia of the rear wheel can cause the resistance member to jump off the tooth tip, so as to drive the driven unit to rotate relative to the drive unit Thereby improving safety.

Description of drawings

Fig. 1 is a side view illustrating a conventional variable speed bicycle;

Fig. 2 is a sectional rear view, illustrating that a pedal mechanism of the variable speed bicycle omits a chain;

Fig. 3 is a sectional side view illustrating the internal structure of the pedal mechanism;

Fig. 4 is a sectional front view illustrating a first preferred embodiment of the hub ratchet device of the present invention which increases the escape resistance;

Fig. 5 is a partial perspective exploded view of the first preferred embodiment, illustrating a driven seat, a clutch unit and a drive unit;

Figure 6 is a partial side view of the first preferred embodiment, illustrating power transmission from multiple pushing surfaces to multiple pawls;

Figure 7 is a view similar to Figure 6, illustrating the transmission of power from three resistance members to the prongs of a ratchet; and

Fig. 8 is a partial side view illustrating a second preferred embodiment of the hub ratchet device with increased escape resistance of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and two embodiments the utility model is described in detail:

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

Referring to Fig. 4,5, the first preferred embodiment of the utility model is suitable for being installed on a bicycle 1 as shown in Fig. 14, and a pedal mechanism 15 arranged on the vehicle body 11 and connected to the transmission unit 14. Referring to FIG. 4 , FIG. 5 , and FIG. 6 , the hub ratchet device with increased escape resistance includes a spindle unit 3 , a driven unit 4 , a clutch unit 5 , and a drive unit 6 .

The spindle unit 3 includes a shaft body 31 having an axis 91 , a first bearing 32 disposed at one end of the shaft body 31 , and a second bearing 33 disposed at the other end of the shaft body 31 .

The driven unit 4 includes a driven seat 41 rotatably arranged on the second bearing 33 around the axis 91, and a follower seat 41 rotatably arranged on the first bearing 32 around the axis 91 and connected to the rear wheel 12. hub shell 42 . The driven seat 41 is fixedly arranged on one side of the hub shell 42, and has three limiting grooves 411 and three resistance grooves 412 arranged around an outer peripheral surface, and a radial direction formed on the outer peripheral surface of the driven seat 41. The container annular groove 413 is recessed toward the axis 91 . Each resistance groove 412 has a valley 414 closest to the axis 91 , and the container annular groove 413 communicates with the limiting groove 411 and the resistance groove 412 .

The clutch unit 5 includes three pawls 51 respectively located in the limiting groove 411, an elastic element 52 sleeved in the annular groove 413 of the container, and three resistance members respectively located in the resistance groove 412. piece 53. Each pawl 51 has a pivot portion 511 pivotally connected to the limiting slot 411 , and an engagement portion 512 extending from the pivot portion 511 . The elastic element 52 is a C-shaped spring, and is hooked on the pivot portion 511 of the pawl 51 to continuously push the engagement portion 512 out of the limiting groove 411 . The resistance member 53 is a roller, and is placed in the resistance groove 412 parallel to the axis 91 and axially limited by the elastic element 52 .

The drive unit 6 is sheathed by a plurality of sprockets (not shown) of the transmission unit 14, and includes a ratchet 61 that is rotatably mounted on the driven seat 4 around the axis 91, and the ratchet 61 has a The body 611 and a plurality of ratchets 612 are disposed around an inner peripheral surface of the body 611 . Each ratchet 612 has a pushing surface 613 that can push the engaging portion 512 when it rotates clockwise, a pressing surface 614 that can push the engaging portion 512 toward the limiting groove 411 when turning reversely, and a connecting surface 613 that connects the pushing surface 613 with The pressing surface 614 can touch the tooth tip 615 of the resistance member 53 , and the radial distance between the tooth tip 615 and the groove 414 is not greater than the diameter of the resistance member 53 .

Referring to Fig. 4, Fig. 6 and Fig. 1, when the user steps on the pedal mechanism 15 of the bicycle 1, the power can be sequentially transferred from the transmission unit 14, the pushing surface 613 of the ratchet 61, the pawl 51, the The driven seat 41, the hub shell 42 are finally transmitted to the rear wheel 12, and the rear wheel 12 rotates to make the bicycle 1 move forward.

Referring to Fig. 4, Fig. 7 and Fig. 1, when the user does not step on the pedal mechanism 15 of the bicycle 1, the power generated by the bicycle 1 moving forward due to inertia sequentially flows from the rear wheel 12, the hub shell 42, the driven The base 41 , the resistance member 53 , the tooth tip 615 of the ratchet 61 , the speed change unit 14 , and finally the chain 153 transmitted to the pedal mechanism 15 .

At this time, if the pedal mechanism 15 stops abnormally, the speed change unit 14 and the ratchet 61 will stop rotating together, but the huge active force produced by the inertia of the rear wheel 12 can drive the resistance member 53 to jump off the tooth tip 615. , so as to drive the driven unit 4 to rotate relative to the drive unit 6, the rear wheel 12 will continue to rotate with greater resistance to stabilize the bicycle 1.

The hub ratchet device of the utility model that increases the jumping resistance has the following beneficial effects:

1. Because the rear wheel 12 is no longer directly connected to the speed change unit 14 through the hub ratchet device that increases the jumping resistance, so when the pedal mechanism 15 stops momentarily, the driven unit 4 can still Rotate relative to the drive unit 6, so the rear wheel 12 will not stop completely and slip and fall, thus achieving the beneficial effect of improving safety.

2. Increase the jumping resistance by means of the resistance member 53. When the user does not actuate the pedal unit 15, the resistance member 53 can still drive the drive unit 6 to rotate, and the chain 153 will not be affected by the derailleur. Therefore, the speed change unit 14 can also carry out the action of speed change, so as to achieve the beneficial effect of "speed change while coasting".

Referring to Fig. 8, the second preferred embodiment of the hub ratchet device of the utility model that increases the jumping resistance is roughly the same as the first preferred embodiment, except that the number of elastic elements 52 of the clutch unit 5 is three , the driven seat 41 has three limiting grooves 411 and three resistance grooves 412 arranged around an outer peripheral surface. Each elastic element 52 is in the form of a shrapnel, and its two opposite ends respectively abut against the corresponding limiting groove 411 and the pawl 51 , so that the pawl 51 can unidirectionally drive the driving unit 6 . In this way, the beneficial effects described in the first embodiment can also be achieved.

Claims (7)

1. A hub ratchet device that increases jumping resistance, comprising a driven unit, a clutch unit and a drive unit, characterized in that: The driven unit includes a driven seat that rotates around an axis, and the driven seat has a plurality of limiting grooves and a plurality of resistance grooves arranged around an outer peripheral surface; The clutch unit includes a plurality of pawls respectively located in the limiting slots, each pawl has a pivoting portion pivotally connected to the limiting slot, and an engaging portion extending from the pivoting portion, the The clutch unit also includes at least one elastic element that continuously pushes the engaging portion out of the limiting groove, and a plurality of resistance members respectively located in the resistance groove; The drive unit includes a ratchet wheel that is rotatably mounted on the driven seat around the axis, the ratchet wheel has a body and a plurality of ratchet teeth that are arranged around an inner peripheral surface of the body body, and each ratchet tooth has a ratchet wheel that pushes the meshing There is a pushing surface to drive the driven seat, a pressing surface to push the engaging portion to the limiting groove, and a tooth tip connecting the pushing surface and the pressing surface and touching the resistance member. 2. The hub ratchet device according to claim 1, characterized in that: the resistance groove of the driven unit has a valley closest to the axis, and the resistance member of the clutch unit is a The roller is parallel to the axis and placed in the resistance groove, and the radial distance between the tooth tip and the groove valley is not greater than the diameter of the resistance member. 3. The hub ratchet device with increased escape resistance according to claim 2, characterized in that: the driven seat of the driven unit also has a concave groove formed on the outer peripheral surface of the driven seat along the radial direction toward the axis. The annular groove of the container is inserted into the set, and the annular groove of the container is connected with the limiting groove and the resistance groove. The C-shaped spring of the pivot joint. 4 . The hub ratchet device with increased escape resistance according to claim 3 , wherein the resistance member of the clutch unit is axially limited by the elastic element. 5. The hub ratchet device with increased escape resistance according to claim 1, characterized in that: the number of the limit groove, the resistance groove of the driven unit, the pawl of the clutch unit, the resistance member and the elastic member There are three of them, and the two opposite ends of each elastic element bear against the corresponding limiting groove and the pawl respectively. 6. The hub ratchet device according to claim 1, characterized in that: the driven unit further comprises a hub shell rotating around the axis, and the driven seat is fixedly arranged on a hub shell side. 7. The hub ratchet device with increased escape resistance according to claim 6, characterized in that: the hub ratchet device with increased escape resistance further comprises a spindle unit, and the spindle unit includes a The shaft body of the axis, a first bearing arranged between one end of the shaft body and the hub shell, and a second bearing arranged between the other end of the shaft body and the driven seat.

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