CN2132680Y

CN2132680Y - Rack of change chain wheel

Info

Publication number: CN2132680Y
Application number: CN 92230915
Authority: CN
Inventors: 陈俊雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-18
Filing date: 1992-08-18
Publication date: 1993-05-12
Anticipated expiration: 2002-08-18

Abstract

The utility model provides a rack of change chain wheel, comprising first type teeth, second type teeth and third type teeth. The front part of the first type tooth extends to the lower part of the tooth valley from one side of the tooth crest to form a concave guide face. The width of the tooth crest of the second type teeth becomes small to make the center of the tooth valley between the first type teeth and the second type teeth extend horizontally toward the side with reduced width of the tooth crest to increase the spacing, and the tooth back part of the tooth crest presents a stair falling form inclined plane. The third type teeth are identical to the second type teeth, the chain holes of the chains are firstly hooked by the front parts of the second type teeth and the third type teeth and then matched with the enlarged spacing of the tooth valley along the concave guide face of the first type teeth to cause the chain hole to easily install the previous chain on the rack behind the third type teeth.

Description

Rack of change chain wheel

The utility model relates to a kind of sprocket wheel gear piece profile of tooth structure, particularly relates to a kind of gear piece of speed-changing chain.

Main purpose of the present utility model is the gear piece that is to provide a kind of speed-changing chain, uses the spacing and the design that increase the tooth peak and is easy to catch on chain purpose flute profile, makes the chain order of chain advance tooth easily and really.

The gear piece of a kind of speed-changing chain that the utility model provides is characterized in that: the order of chain order chaining on gear piece that the gear piece of sprocket wheel is following rear chain forms following three kinds of flute profiles structure; Two first type teeth, the front tooth part of these two first type teeth extend to its tooth paddy bottom from two tooth peaks, one side simultaneously and are formed with the depression guiding face, just guide chain chain order to enter the sunk surface portion of tooth; The second type tooth, its tooth peak width is less, make the mind-set tooth peak width reduces in the peak-to-peak tooth paddy of the tooth of itself and the first type tooth a side be the plane and extend increasing spacing, and the tooth rear portion at tooth peak is the step drop shape inclined-plane; The 3rd type tooth is identical with the second type tooth; Its front tooth part is predetermined thickness and colludes column; The depression guiding face of the chain order of chain along two first type teeth so is provided,, makes the chain order advance tooth easily really by by front tooth part that catches on second and third type tooth and the spacing that adds canine tooth paddy.

The gear piece of speed-changing chain of the present utility model, it provides chain chain order to change liter along the depression guiding face, is caught on by two teeth that the tooth peak separation increases, tooth peak width diminishes is the step therein truncation surface with the tooth rear portion again, makes thereafter chain order and flute profile advance tooth easily and really.

Be elaborated below by most preferred embodiment and accompanying drawing gear piece to speed-changing chain of the present utility model, in the accompanying drawing:

Fig. 1 is the combination view of the utility model embodiment.

Fig. 2 is the part enlarged drawing of the utility model embodiment sprocket wheel.

Fig. 3～6th, the I-I of the utility model embodiment sprocket wheel flute profile, II-II, III-III, IV-IV cutaway view.

Fig. 7 is the top view of the utility model embodiment two flute profile I-I.

Fig. 8 is the chain order cochain scheme drawing of the utility model embodiment chain.

Fig. 9 is the chain order cochain scheme drawing of the utility model embodiment chain.

See also shown in Fig. 1,2,8, in the present embodiment, the gear piece 10 of sprocket wheel 1 following the chain order 21 of rear chain 20 hang (on) order of chain on gear piece 10 form following three kinds of flute profiles structure: please cooperate shown in Fig. 3～6, two first type teeth 11, its front tooth part 111 side from two tooth peaks 113 simultaneously extends to its tooth paddy 115 bottom book offices formation depression guiding faces 117, promptly guides chain chain order to enter the sunk surface portion 117 of tooth; Please cooperate shown in Fig. 3～7, the front tooth part 131 of the second type tooth 13 is the predetermined thickness plane and colludes column, the second type tooth tooth peak, 133 width are than the first type tooth tooth peak, 113 little 0.6mm, between the tooth peak 113 of the second type tooth tooth peak 133 and the first type tooth 11 is tooth paddy 135, a side that is reduced by middle mind-set tooth peak 133 width of tooth paddy 135 is the plane and extends 0.6mm, so that increase the spacing at first and second type tooth tooth peak, the tooth rear portion 137 at tooth peak 133 is step drop shape inclined-plane 139; The 3rd type tooth 15 is identical with the second type tooth.

First and

second type tooth

11,13 or the second type tooth, the peak-to-peak method of reaching canine tooth paddy 135,155 spacings of the

3rd type tooth

13,15 mutual teeth, be to make tooth peak 133,153 width of second and

third type tooth

13,15 homonymies all reduce 0.6mm, make the side that the mind-set tooth peak width reduces in each tooth paddy be plane extension increase 0.6mm, so that make chain order 21 advance tooth easily, the desired depth at the tooth rear portion 137,157 of second and

third type tooth

13,15 is step therein and blocks shape 139,159; The depression guiding face 117 of the chain order 21 of chain 20 along two first type teeth 11 so is provided, earlier by the front tooth part 131,151 that catches on second and

third type tooth

13,15 and by by tooth paddy 135,155 spacings that strengthen, make chain 20 chain orders 21 easy and certain cochains on the later gear piece of the 3rd flute profile 15.

The gear piece of speed-changing chain of the present utility model expects that the effect statement of reaching is as back:

During use, be to control 20 upper and lower grades of derailers of chain when (figure does not show) through operation earlier, the chain order 21 of chain 20 is leading along 117 of the depression guiding faces that two first type tooth 11 1 sides form, then, by front tooth part 131,151 chain order 21 is caught on, make chain 20 chain orders 21 easy and certain cochains on the later gear piece flute profile of the 3rd flute profile 15 by tooth paddy 135,155 spacings that strengthen and second and

third type tooth

13,15.

Claims

1, a kind of gear piece of speed-changing chain is characterized in that: the gear piece of sprocket wheel is that the order of chain order chaining on gear piece of following rear chain forms following three kinds of flute profiles structure:

The first type tooth, its front tooth part one side is formed with the depression guiding face;

The second type tooth, its tooth peak width is littler than the first type tooth, and the peak-to-peak tooth paddy spacing of tooth of itself and the first type tooth is strengthened, and the tooth rear portion at its tooth peak is the step drop shape inclined-plane;

The 3rd type tooth, it is identical with the second type tooth; It provides the depression guiding face of the chain order of chain along the first type tooth, and the front tooth part by second and third type tooth catches on the tooth paddy spacing that cooperates increasing more earlier, makes the easy and certain cochain of chain chain order on the later gear piece of the 3rd flute profile.

2, according to the gear piece of the described speed-changing chain of claim 1, it is characterized in that: the depression guiding face of the first type tooth is to extend to its position below tooth paddy by tooth peak one side, forms the chain purpose sunk surface portion of guiding chain.

3, according to the gear piece of claim 1 or 2 described speed-changing chains, it is characterized in that: the peak-to-peak and second type tooth of first and second type tooth tooth, the peak-to-peak tooth paddy spacing increasing mode of the 3rd type tooth tooth are to make the tooth peak width of second and third type tooth homonymy reduce 0.6mm, and making the mind-set tooth peak width reduces in the tooth paddy a side be the plane increases 0.6mm.

4, according to the gear piece of the described speed-changing chain of claim 3, it is characterized in that: the tooth rear portion of second and third type tooth is ladder and blocks shape, and front tooth part is and colludes column.