TWM500732U - Chain wheel capable of preventing chain from dropping - Google Patents

Description

Anti-drop chain

This creation relates to a toothed disc of a bicycle, and more particularly to an anti-drop chain.

As shown in Fig. 8, for the driving structure of the conventional bicycle, this configuration can be seen in the variable speed bicycle, which is pivoted on the frame 82 with a toothed disc 81, and is wound with a chain 83 by another toothed disc (not shown). A chain guide 84 is provided, and the guide chain 84 is mainly disposed in that the chain 83 has a tight change during the shifting process, so that the chain guide 83 abuts the chain 83 at the side of the toothed disc 81, so that the chain 83 is provided. The process of the variable speed drive does not fall. However, although the chain guide 83 can be prevented from falling by the chain guide 84, the chain guide 84 is a separate member other than the spur 81, so that the chain guide 84 can increase the weight of the bicycle in addition to the weight of the bicycle. The increase, the installation also has its troubles, and has problems affecting the appearance.
Further, as shown in Fig. 9, a configuration of a conventional toothed disc 9 is provided with a tooth portion 91 and a tooth portion 92 which are spaced apart from each other. The tooth portion 91 is thick and protrudes on both sides, and the tooth portion 92 is wider. Narrowly like the tooth portion of the conventional toothed disc, the toothed disc 9 is mounted with a correspondingly widened space between the tooth portion 91 and the tooth portion 92 and the chain (not shown), so that the chain is not easy to be toothed during the transmission process. The disc 9 is detached to solve the aforementioned problem of attaching the chain guide 84.
However, the tooth portion 91 and the tooth portion 92 of the toothed disc 9 must have different thicknesses, and the foregoing functions can be achieved. However, the same toothed disc is required to form the tooth portions of different tooth shapes, and the machining requirements must be more precise, and the manufacturing process is required. It has also become relatively complicated, so the cost of the conventional toothed disc is bound to increase a lot.
Moreover, the tooth portion 91 of the toothed disc 9 and the tooth portion 92 are arranged in phase, and generally the total number of teeth is designed as an even number of teeth, which can be linked to the chain space of different widths of the chain, but the design of the toothed to tooth ratio is often required to be precise. Sometimes it is necessary to have only one tooth difference, so it is foreseen that the conventional toothed disc 9 will be limited in design due to the necessity of even teeth.

The main purpose of the present invention is to solve the above problems and provide an anti-falling sprocket wheel, which does not have the problem of increasing the cost in the process, and the total tooth portion of the sprocket is not limited by the even number of teeth, but is advantageous for the gear ratio. The design.
For the purpose of the foregoing, the present invention includes a disk body having a plurality of teeth arranged in a ring shape, and any two adjacent tooth portions are separated by a distance to form a groove for the roller of the chain. a portion of each of the teeth that is in contact with the roller when the chain is driven has a slightly protruding portion facing the groove, and a vertical height of the bottom portion of the groove portion to the blocking portion is greater than the bottom portion to the groove portion The vertical height of the roller shaft is limited to the groove portion when the roller is driven by the chain to form a laterally tight force with the side wall.
Wherein any two adjacent tooth portions respectively have a front stop portion on the side walls of the two sides of the same groove portion, the second stop portions have the same vertical height and a first pitch, and the largest groove portion below the second stop portion The diameter has a second pitch, the first pitch and the second pitch are both greater than a diameter of the roller, and the second pitch is slightly larger than the first pitch.
Wherein each of the tooth portions has a relatively lower root segment and has a relatively upper tooth peak segment, the tooth peak segment is tapered toward a width and a thickness away from the root segment, and each tooth portion is on the side wall. The blocking portion is at the intersection of the root portion and the peak portion.
The above and other objects and advantages of the present invention will become more apparent from the detailed description and the accompanying drawings.
Of course, the present invention is allowed to differ in some of the parts, or the arrangement of the parts, but the selected embodiments are described in detail in the present specification, and the construction thereof is shown in the drawings.

(customized part)
81‧‧‧ toothed disc
82‧‧‧ frame
83‧‧‧Chapter
84‧‧‧Chaper guide
9‧‧‧ toothed disc
91‧‧‧ teeth
92‧‧‧ Teeth (this part of the creation)
1‧‧‧ dish
11‧‧‧ teeth
111‧‧‧ side wall
112‧‧‧ tooth root segment
113‧‧‧Tooth peak
12‧‧‧Slots
13‧‧ ‧ 挡
2‧‧‧Chain
21‧‧‧Roller
211‧‧‧Axis
L1‧‧‧ vertical height
L2‧‧‧ vertical height
D1‧‧‧first spacing
D2‧‧‧second spacing

Fig. 1 is a perspective view showing the tooth plate of the first embodiment of the present invention.
Fig. 2 is a schematic view showing the arrangement of the toothed disc of the first embodiment of the present invention on a chain.
Figure 3 is a partially enlarged structural view of the toothed disc of the first embodiment of the present invention in the tooth portion and the groove portion, in particular, the roller is in the groove portion, and the axis of the roller is perpendicular to the stopper portion of the tooth portion. There are height differences in height.
Fig. 4 is a longitudinal sectional side view showing the tooth portion of the toothed disc of the first embodiment of the present invention including the root portion and the peak portion.
Figure 5 is a partially enlarged structural view of the toothed disc of the first embodiment of the present invention in the tooth portion and the groove portion, in particular, the difference between the maximum diameter between the blocking portion and the groove portion of the second groove portion in the same groove portion. .
Fig. 6 is a partially enlarged structural view showing the toothed disc of the second embodiment of the present invention in the tooth portion and the groove portion.
Fig. 7 is a partially enlarged structural view showing the tooth plate of the third embodiment of the present invention in the tooth portion and the groove portion.
Figure 8 is a schematic view showing the driving structure of a conventional bicycle.
Figure 9 is a structural view of a conventional toothed disc.

Please refer to FIG. 1 to FIG. 7 , which shows the structure of the embodiment selected for the creation of the present invention. This is for illustrative purposes only and is not limited by the structure in the patent application.
The embodiment provides a sprocket preventing disc, which is shown in FIGS. 1 to 3, and includes a disc body 1 having a plurality of teeth portions 11 which are arranged in a ring shape and are The plurality of tooth portions 11 of the embodiment have the same shape, and any two adjacent tooth portions 11 are separated by a distance to form a groove portion 12, the plurality of tooth portions 11 are provided for the chain 2, and the groove portion 12 is used for the rolling of the chain 2 Sub 21 is accommodated.
As shown in FIG. 3, each of the tooth portions 11 has a blocking portion 13 slightly convex toward the groove portion 12 when the chain 2 is driven, and the bottom portion of the groove portion 12 to the blocking portion The vertical height L1 of 13 is greater than the vertical height L2 of the bottom to the axis 21 of the roller 21 in the groove portion 12. When the roller 21 is driven by the chain 2 to form a laterally tight force with the side wall 111, the roller The 21 is blocked by the stopper 13 and is restricted in the groove portion 12.
As shown in Figures 3 to 4, each of the tooth portions 11 in this embodiment has a relatively lower root segment 112 and has a relatively upper tooth peak segment 113 that faces away from the tooth. The width and thickness of the root segment 112 are tapered, and the respective tooth portions 11 are at the intersection of the root portion 112 and the tooth peak portion 113 at the blocking portion of the side wall 111.
As shown in FIG. 5 , in the present embodiment, any two adjacent tooth portions 11 respectively have a blocking portion 13 on the side walls 111 on both sides of the same groove portion 12 , and the two blocking portions 13 have the same vertical height and have one. The first pitch D1, and the maximum diameter of the groove portion 12 below the second stop portion 13 has a second pitch D2, the first pitch D1 and the second pitch D2 are both larger than the diameter width of the roller 21, and the second The pitch D2 is slightly larger than the first pitch D1.
When the chain 2 is wound around the tooth portion 11 of the disk body 1, regardless of the direction of the transmission (ie, forward or reverse), since the tooth portion 11 of the disk body 1 has a stop on the side wall which is in close contact with the roller 21. The portion 13 and the blocking portion 13 are slightly convex. Therefore, when the roller 21 is driven by the chain 2 to form a laterally tight force with the side wall 111, even if there is a slight upward vertical component, the roller 21 will still be blocked by the blocking portion 13, unless the chain 2 is subjected to an external force such that the longitudinal component force is greater than the extent that the blocking portion 13 can be blocked, otherwise the roller 21 will be restrained in the groove portion 12 without being affected by the disk body. 1 drop. In other words, during the transmission of the chain 2 on the tooth portion 11 of the disk body 1, the force of the roller 21 in the respective groove portions 12 to form a lateral contact with the side wall 111 due to the position is different, although some The roller 21 leaves the groove portion 12 because the longitudinal component force gradually increases, but most of the rollers still abut against the side wall 111, so that the chain 2 is not dropped by the disk body 1 to maintain the transmission state.
It is not difficult to find out from the above description that the advantage of the present invention is that the side wall 111 of the tooth portion 11 is provided with the slightly protruding portion 13 of the tooth portion 11, so that the roller 21 can be secured to the chain body 1 on the disk body 1 as described above. The process does not fall during the process, and the plurality of teeth 11 arranged in a ring shape on the disk body 1 have the same shape, and there is no problem in cost increase in the process compared with the conventional toothed disk, and the total number of teeth of the toothed disk is not Limited by the even number of teeth, and is conducive to the design of the tooth ratio.
Of course, there are still many examples of this creation, only the details change. Please refer to FIG. 6 , which is a second embodiment of the present invention. The main difference from the first embodiment is that the first embodiment has the side walls 111 of the teeth 11 on both sides of the same groove portion 12 each having a first block. In the present embodiment, only the side wall 111 on the right side of each tooth portion 11 has a stopper portion 13, and the same effect as that of the first embodiment can be achieved.
Referring to FIG. 7, which is a third embodiment of the present invention, the main difference from the first embodiment is that the first embodiment has the side walls 111 of the teeth 11 on both sides of the same groove portion 12 each having a first block. In the present embodiment, only the side wall 111 on the left side of each tooth portion 11 has a stopper portion 13, and the same effect as that of the first embodiment can be achieved.
To help explain that the toothed disc of the present invention does have a groove portion for restricting the roller between the teeth when it is wound around the chain, it is described by a photograph of the attachment. The attached photo shows the chain of the creation and the chain of the chain. The chain is tied with a rope, and the chain is placed on the tooth of the toothed disc to make the roller into the groove between the teeth. And pull the rope to simulate the lateral force generated by the roller and the side wall of the tooth when the chain is driven. At this time, it can be seen that the chain and the chainring are chained, so that the toothed disc of the creation is indeed available. Chain around the chain without falling.
The above description of the embodiments is intended to be illustrative of the present invention and is not intended to limit the scope of the present invention.
From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the aforementioned objectives, and has been in compliance with the provisions of the Patent Law, and has filed a patent application.

1‧‧‧ dish

11‧‧‧ teeth

111‧‧‧ side wall

112‧‧‧ tooth root segment

113‧‧‧Tooth peak

12‧‧‧Slots

13‧‧ ‧ 挡

2‧‧‧Chain

21‧‧‧Roller

211‧‧‧Axis

L1‧‧‧ vertical height

L2‧‧‧ vertical height

Claims (3)

[Item 1] An anti-drop sprocket wheel comprises a disc body having a plurality of annularly arranged tooth portions, and any two adjacent tooth portions are separated by a distance to form a groove portion for the roller of the chain. Each of the tooth portions has a slightly protruding portion toward the side of the roller when the chain is driven, and a vertical height of the bottom portion of the groove portion to the blocking portion is greater than a roll from the bottom portion to the groove portion. The vertical height of the sub-axis is limited to the groove portion when the roller is driven by the chain to form a laterally tight force with the side wall. [Item 2] The anti-drop sprocket according to claim 1, wherein any two adjacent tooth portions have a front stop on each side wall of the same groove portion, and the second block has the same vertical height and has a first a pitch, and a maximum diameter of the groove portion below the second stop portion has a second pitch, the first pitch and the second pitch are both greater than a diameter of the roller, and the second pitch is slightly larger than the first pitch. [Item 3] The sprocket according to claim 1 or 2, wherein each of the teeth has a relatively lower root segment and has a relatively upper tooth peak segment, the tooth peak segment facing away from the root The width and thickness of the segments are tapered, and the teeth of the teeth are at the intersection of the root portion and the peak portion of the tooth.