CN101734336B - Bicycle chainring with guiding structure - Google Patents

Abstract

The present invention is a bicycle gear disc with a guiding structure, which comprises a large gear disc and a small gear disc which are combined and rotated concentrically, and the two gear discs are provided with a number of tooth portions, the large gear disc has a number of guiding structures, the guiding structure comprises an auxiliary groove, the auxiliary groove is adjacent to the tooth portion of the large gear disc, the auxiliary groove extends to the outer periphery of the large gear disc and is open, the auxiliary groove forms a receiving surface, the receiving surface has two concave portions and a convex portion, the concave portion corresponds to the connecting portion of the chain, and the convex portion corresponds to the clamping portion of the chain.

Description

Bicycle chainring with guiding structure

technical field

The invention relates to a bicycle chainring, in particular to a bicycle chainring with a guiding structure.

Background technique

In order to cope with various slope road conditions, many bicycles will be equipped with different sizes of chainrings, and use the chain to match the change of the front and rear gear ratios to produce labor-saving or acceleration effects. The reason why the chain can switch between chainrings of different sizes and heights , mainly using the movement of the transmission to pull the chain offset to switch the position of the chain.

Referring to the U.S. Patent No. US5458543 "BICYCLE MULTIPLE SPROCKET ASSEMBLY" patent case, as shown in Figure 4 and Figure 5, the bicycle multiple chain sprocket device includes the chain sprockets 2, 3 and the chain support part 12. When the small-diameter buckle sprocket 2 is converted to the larger-diameter buckle sprocket 3, the chain support part 12 can be used to support the chain edge of the chain C. In addition, a notch 13 is formed on the buckle chain The wheel 3 includes a stepped surface 13a abutting against the supporting surface 12a of the chain piece supporting portion 12 .

In the above-mentioned existing structure, the supporting part 12 is installed on the surface of the large-diameter sprocket 3, and the supporting part 12 protrudes from the surface of the large-diameter sprocket 3. After the chain C switches the sprockets 2 and 3 for many times , the joint between the support part 12 and the notch 13 is easy to loosen or shift, resulting in the change of the angle between the support part 12 and the notch 13, so that the chain C cannot be smoothly and accurately wound to the large-diameter buckle sprocket 3, and the support The smooth curve formed by the portion 12 and the notch 13 cannot ensure that the chain C snaps into the tooth portion of the large-diameter sprocket 3 in the correct phase; the additional support portion 12 only increases the weight and volume of the car body, obviously Contrary to today's pursuit of lightweight bicycles.

Furthermore, when the chain C is switching the buckle sprocket 2, 3, the chain C is close to the notch 13 and the support part 12 to switch the chain C, so the notch 13 and the support part 12 assist the switching position for a long time, the notch 13 and the support After part 12 is subjected to wear and tear that accumulates over time, so that chain C is difficult to switch sprocket 2,3, reduces the life-span of sprocket device.

Not only that, when the chain C is separated from the small-diameter sprocket 2, the chain C is likely to interfere with the surface of the large-diameter sprocket 3, causing the chain C to be unable to change quickly, and the chain C is often subject to the friction of the sprocket 3, and cannot Switch smoothly. For the problems referred to above, there is an urgent need for improvement.

Accordingly, the present invention seeks to obviate or at least alleviate the problems encountered by the prior art.

Contents of the invention

The technical problem to be solved by the present invention is to provide a bicycle chainring with a guiding structure in view of the above-mentioned deficiencies in the prior art.

The main purpose of the present invention is that the auxiliary groove does not need to install any support protruding from the large chainring, and will not increase the weight and volume of the chainring, which meets the requirements of light weight, and when the chain enters the auxiliary groove, The concave part of the receiving surface is opposite to the joint part of the outer chain piece, and the convex part of the receiving surface is opposite to the card part of the outer chain piece, and the said card part is not in contact with the outer chain piece, so as to guide the outer chain The phase of the slice.

The secondary purpose of the present invention is that the guide structure embeds two auxiliary pins adjacent to the auxiliary groove, so as to slow down the wearing of the auxiliary groove by the chain and increase the service life of the chainring.

Another object of the present invention is that the chain slides away from the small chainring and slides into the dodging groove, thereby reducing the interference between the chain and the surface of the large chainring and making the switching of the chain smoother.

In order to achieve the above object, the technical scheme adopted in the present invention comprises:

A bicycle chainring with a guiding structure, which has a large chainring and a small chainring, the large chainring and the small chainring are combined and rotate concentrically, and both chainrings are equipped with several The tooth part is characterized in that: the large toothed disc has several guiding structures, and the guiding structures include:

An auxiliary groove, adjacent to the teeth of the large toothed disc, the auxiliary groove extends to the outer peripheral edge of the large toothed disc in an open shape, the auxiliary groove forms a bearing surface, and the bearing surface has Two concave parts and one convex part, the concave part corresponds to the joint part of the chain, and the convex part corresponds to the locking part of the chain;

A dodging groove, the dodging groove is arranged behind the auxiliary groove, and the dodging groove extends to the inner peripheral edge in an open shape, the dodging groove has a first end and a second end, the second end of the dodging groove is adjacent to the auxiliary groove, the depth of the first end of the dodging groove is smaller than the depth of the second end of the dodging groove, and the outer chain The profile of the sheet is smaller than the recessed space formed by the dodging groove.

In order to achieve the above object, the technical scheme adopted in the present invention also includes:

A bicycle chainring with a guiding structure, which has a large chainring and a small chainring, the large chainring and the small chainring are combined and rotate concentrically, and both chainrings are equipped with several The tooth part is characterized in that: the large toothed disc has several guiding structures, and the guiding structures include:

an auxiliary groove, adjacent to the teeth of the large toothed disc, the auxiliary groove extends to the outer peripheral edge in an open shape, and the auxiliary groove forms a receiving surface;

A dodging groove, the dodging groove is arranged behind the auxiliary groove, and the dodging groove extends to the inner peripheral edge in an open shape, the dodging groove has a first end and a second end, the second end of the dodging groove is adjacent to the auxiliary groove, the depth of the first end of the dodging groove is smaller than the depth of the second end of the dodging groove, and the outer chain The profile of the sheet is smaller than the recessed space formed by the dodging groove;

Two auxiliary pins are buried on the large chainring, and the two auxiliary pins are respectively adjacent to the auxiliary grooves, and the outer edges of the auxiliary pins extend into the auxiliary grooves from the bearing surface , for the junction of the chain to contact.

Compared with prior art, the beneficial effect that the present invention has is:

1. The "bicycle chainring with guiding structure" of the present invention, in which the auxiliary groove does not need to install any support protruding from the large chainring, and will not increase the weight and volume of the chainring, which meets the requirements of light weight requirements, and when the chain enters the auxiliary groove, the concave part of the receiving surface is relative to the joint part of the outer chain piece, and the convex part of the receiving surface is relative to the card part of the outer chain piece, and the card part and the outer chain The plates are not in contact to guide the phase of the outer chain plates.

2. The "bicycle chainring with a guide structure" of the present invention, wherein the guide structure embeds two auxiliary pins adjacent to the auxiliary groove to slow down the wear of the chain and increase the service life of the chainring.

3. The "bicycle chainring with guiding structure" of the present invention, in which the chain is separated from the small chainring and slides into the dodging groove, which reduces the interference between the chain and the surface of the large chainring and makes the switching of the chain more smooth.

Description of drawings

Fig. 1 is the three-dimensional appearance diagram of the bicycle toothed plate of the present invention;

Fig. 2 is the three-dimensional exploded view of the bicycle chainring of the present invention;

Fig. 3 is the front view of the bicycle chainring of the present invention;

Fig. 4 is the partial enlarged view of Fig. 3 of the present invention;

Fig. 5 is the sectional view that Fig. 3 of the present invention is taken along section line 5-5;

Figure 6 is a continuation of Figure 5, showing a schematic diagram of chain switching;

7 is a perspective view of a second embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of a second embodiment of the present invention.

Explanation of reference numerals: 10-large tooth plate; 11-teeth; 12-outer peripheral edge; 13-inner peripheral edge; 20-small tooth plate; 21-teeth; 30-guiding structure; 31-connecting part; 40- Auxiliary groove; 401 first end; 402-second end; 41-receiving surface; 411-concave; 412-convex; 42-auxiliary pin; end; 51-first section; 52-second section; 60-chain; 61-outer chain; 611-card; 612-junction; 62-inner chain; 70-dodge groove; 701-first 702-second end; 71-bevel; 80-auxiliary groove; 81-bevel; L-width; S-spacing.

Detailed ways

Regarding the technology, means and effects used in the present invention, a preferred embodiment is given and described in detail below with drawings, which are for illustration purposes only, and are not limited by this structure in the patent application.

Please refer to Fig. 1 and Fig. 2, which are the three-dimensional appearance diagram and the three-dimensional exploded view of the present invention, the present invention includes a large toothed plate 10 and a small toothed plate 20, and the large toothed plate 10 and the small toothed plate 20 are located on concentric, and the chain is located on one of the two chainrings 10, 20, and the chain is controlled by the transmission to switch between the large chainring 10 and the small chainring 20, the large chainring 10 has several guide structures 30, so The above-mentioned guide structure 30 assists the chain to switch between the chainrings more smoothly, and can reduce the wear between the chain and the large chainring 10 .

Referring to Figures 2 to 4, the large toothed disc 10 and the small toothed disc 20 are combined together by a joint, and the large and small toothed discs 10, 20 can rotate concentrically, and the large and small toothed discs 10, 20 ring There are several protruding tooth parts 11, 21, and the tooth parts 11, 21 are used to mesh with the chain 60 of the bicycle. The large chainring 10 is called the front by the forward direction of the chain 60, and is called by the backward direction of the chain 60. For the rear, the large chainring 10 has an outer peripheral edge 12 and an inner peripheral edge 13 . Wherein the chain 60 is composed of an outer chain piece 61 and an inner chain piece 62 connected alternately. The outer chain piece 61 and the inner chain piece 62 include a clamping portion 611 and a joint portion 612. The clamping portion 611 is for the teeth 11, 21 to penetrate. stuck.

The guide structure 30 is provided on the surface of the large sprocket 10 relative to the small sprocket 20 , the guide structure 30 includes an auxiliary groove 40 and an avoidance groove 50 , and the guide structure 30 is provided for the chain 60 Smooth switching between the two toothed discs 10 and 20.

The auxiliary groove 40 is adjacent to the tooth portion 11 of the large toothed disc 10, and in this embodiment, the auxiliary groove 40 is formed by milling, and the auxiliary groove 40 extends to the outer peripheral edge 12 of the large toothed disc 10 and is open. shape, and the auxiliary groove 40 is formed with a receiving surface 41, the outline of the receiving surface 41 is close to the outline of the card part 611 and the joint part 612 formed by the outer chain piece 61 and the inner chain piece 62, so that the chain 60 is secure Sliding into the auxiliary groove 40 helps the chain 60 to be stuck on the tooth portion 11 smoothly. Not only that, the auxiliary groove 40 has a first end 401 and a second end 402, and the second end 402 is adjacent to the tooth portion 11 of the large chainring 10, assisting The groove 40 is stepped along the direction in which the chain 60 advances, and the depth of the first end 401 of the auxiliary groove 40 is smaller than the depth of the second end 402, so as to reduce the interference between the chain 60 and the large chainring 10 and guide the chain 60 smooth switching. The receiving surface 41 formed in the auxiliary groove 40 is used to support the chain 60, and the receiving surface 41 is also used to position the phase of the chain 60. The receiving surface 41 corresponds to the outer chain piece 61 and the inner chain piece 62 on one side of the chain 60. The contours of the formed clip part 611 and the joint part 612 form two concave parts 411 and a convex part 412. When the chain 60 falls into the auxiliary groove 40, the concave part 411 falls into the joint part 612 correspondingly, and the convex part 412 The portion 412 falls into the locking portion 611 correspondingly, and at the same time, the receiving surface 41 is not in contact with the locking portion 611 of the chain 60 at the convex portion 412, so that the chain 60 falls into the auxiliary groove 40 with the correct phase. The guide structure 30 embeds two auxiliary pins 42 adjacent to the two recesses 411 of the large toothed plate 10, and the auxiliary pins 42 do not protrude from the surface of the large toothed plate 10, and the outer edges of the two auxiliary pins 42 touch the auxiliary pins. groove 40, so that the auxiliary pin 42 abuts against the chain 60, while the protrusion 412 is slightly away from the catch portion 611 of the chain 60 without contact, so that the two auxiliary pins 42 can contact the chain 60 without interference. Generally speaking, the receiving surface 41 of the auxiliary groove 40 is at right angles to the wall surface of the auxiliary groove 40, and in order to prevent the chain 60 from slipping out of the auxiliary groove 40, the receiving surface 41 of the auxiliary groove 40 is slightly upwardly inclined to align with the auxiliary groove. The wall of 40 can be milled to an acute angle of less than ninety degrees.

The dodging groove 50 is arranged behind the auxiliary groove 40, and the dodging groove 50 extends to the inner peripheral edge 13 of the large chainring 10 and is open. The dodging groove 50 has a first end 501 and a second end 502, the chain 60 advances from the first end 501 to the second end 502, the second end 502 is adjacent to the auxiliary groove 40, and the avoidance groove 50 has a first section 51 And a second section 52, the second section 52 is formed at the end of the second end 502, the dodging groove 50 is step-like along the direction in which the chain 60 advances, and the depth of the first end 501 of the dodging groove 50 is smaller than that of the second The depth of the end 502 forms the first section 51 and the second section 52 . When the chain 60 is switched to the large sprocket 10, it first slides into the dodging groove 50, the dodging groove 50 can reduce the interference between the chain 60 and the surface of the large sprocket 10, and the outline size of the dodging groove 50 is sufficient for the chain 60 The outer chain sheet 61 or the inner chain sheet 62 falls into the escape groove 50, and the chain 60 first enters the first section 51 and then enters the second section 52.

The auxiliary groove 40 and the avoidance groove 50 are milled apart from each other, and the guide structure 30 forms a connecting portion 31 at the unmilled part between the auxiliary groove 40 and the avoidance groove 50 .

Referring to Fig. 4 to Fig. 6, when the chain 60 is controlled by the transmission to switch from the small sprocket 20 to the large sprocket 10, at first the chain 60 will break away from the small sprocket 20 and enter the dodging groove 50, so that the chain 60 can reduce the contact with the large sprocket. The interference on the surface of the toothed disc 10 makes the chain 60 switch between the two toothed discs 10 and 20 more smoothly, and the outline of the outer chain piece 61 of the chain 60 is smaller than the concave space formed by the dodging groove 50, and then the chain 60 passes through the dodging When the groove 50 reaches the connecting portion 31 , the connecting portion 31 without milling pushes away the chain 60 to prevent the chain 60 from falling into the auxiliary groove 40 at an incorrect phase. The width L of the connecting portion 31 is smaller than the distance S between two adjacent outer chain pieces 61 of the chain 60 , so that the chain 60 falls into the auxiliary groove 40 with a fixed phase. After the chain 60 passes through the connecting portion 31, it then enters the auxiliary groove 40. The catch portion 611 and the joint portion 612 of the chain 60 can just fall into the positions of the two concave portions 411 and the convex portion 412, while the joint portion 612 of the chain 60 is located in the concave portion 411. The catch portion 611 of the chain 60 is located at the convex portion 412; and the joint portion 612 of the chain 60 is directly in contact with the two auxiliary pins 42, and at the same time, there is a distance between the clip portion 611 of the chain 60 and the convex portion 412 without contact, so that the two auxiliary pins 42 can indeed contact with the joint portion 612 of the chain 60, and the effect of the two auxiliary pins 42 is to slow down the wear of the auxiliary groove 40 and increase the service life of the large chainring 10. Finally, the chain 60 will switch along the auxiliary groove 40 and engage with the tooth portion 11 of the large chainring 10 .

Referring to FIG. 7 and FIG. 8 , it is a perspective view and a schematic diagram of a second embodiment of the present invention. The second embodiment is roughly the same as the first embodiment, and is characterized in that the depth of the first end 701 of the dodging groove 70 is smaller than the depth of the second end 702 to form a slope 71, and the auxiliary groove 80 is along the The forward direction of the chain 60 forms a slope 81 for the chain 60 to move forward more smoothly in the escape groove 70 and the auxiliary groove 80 .

Can conclude that the present invention has the following advantages with regard to the above:

1. The "bicycle chainring with guiding structure" of the present invention, in which the auxiliary groove does not need to install any support protruding from the large chainring, and will not increase the weight and volume of the chainring, which meets the requirements of light weight requirements, and when the chain enters the auxiliary groove, the concave part of the receiving surface is relative to the joint part of the outer chain piece, and the convex part of the receiving surface is relative to the card part of the outer chain piece, and the card part and the outer chain The plates are not in contact to guide the phase of the outer chain plates.

2. The "bicycle chainring with a guide structure" of the present invention, wherein the guide structure embeds two auxiliary pins adjacent to the auxiliary groove to slow down the wear of the chain and increase the service life of the chainring.

3. The "bicycle chainring with guiding structure" of the present invention, in which the chain is separated from the small chainring and slides into the dodging groove, which reduces the interference between the chain and the surface of the large chainring and makes the switching of the chain more smooth.

The above description is only illustrative of the present invention, rather than restrictive. Those of ordinary skill in the art understand that many modifications, changes or equivalents can be made without departing from the spirit and scope defined in the claims, but All will fall within the protection scope of the present invention.

Claims (8)

1. A bicycle chainring with a guiding structure, which has a large chainring and a small chainring, the large chainring and the small chainring are combined and rotate concentrically, and the two chainrings are all rings There are several tooth parts, and it is characterized in that: there are several guide structures on the large toothed plate, and the guide structures include: An auxiliary groove, adjacent to the teeth of the large toothed disc, the auxiliary groove extends to the outer peripheral edge of the large toothed disc in an open shape, the auxiliary groove forms a bearing surface, and the bearing surface has Two concave parts and one convex part, the concave part corresponds to the joint part of the chain, and the convex part corresponds to the locking part of the chain; A dodging groove, the dodging groove is arranged behind the auxiliary groove, and the dodging groove extends to the inner peripheral edge in an open shape, the dodging groove has a first end and a second end, the second end of the dodging groove is adjacent to the auxiliary groove, the depth of the first end of the dodging groove is smaller than the depth of the second end of the dodging groove, and the outer chain The profile of the sheet is smaller than the recessed space formed by the dodging groove. 2. The bicycle chainring with a guiding structure according to claim 1, characterized in that: said guiding structure further comprises two auxiliary pins embedded in said large chainring, And the two auxiliary pins are respectively adjacent to the auxiliary groove, and the outer edge of the auxiliary pin extends into the auxiliary groove from the receiving surface, so as to be contacted by the joint part of the chain; The outline of the auxiliary groove is close to the outline formed by the joint part and the clip part on one side of the chain. The auxiliary groove has a first end and a second end, and the second end is adjacent to the teeth of the large chainring. The depth of the first end of the auxiliary groove is smaller than the depth of the second end, and the two concave portions are formed at both ends of the convex portion. When the chain falls into the auxiliary groove, the convex portion and the chain The card parts are not in contact. 3. The bicycle chainring with a guiding structure according to claim 1, characterized in that: said guiding structure has a connecting portion between said auxiliary groove and said dodging groove, said The surface of the connecting portion is connected and extended with the large toothed disc, and the width of the connecting portion is smaller than the distance between two adjacent outer chain pieces of the chain. 4. The bicycle chainring with a guiding structure according to claim 1 or 2, characterized in that: the angle between the receiving surface of the auxiliary groove and the wall surface of the auxiliary groove is not greater than ninety degrees of right angles . 5. A bicycle chainring with a guiding structure, which has a large chainring and a small chainring, the large chainring and the small chainring are combined and rotate concentrically, and the two chainrings are all rings There are several tooth parts, and it is characterized in that: there are several guide structures on the large toothed plate, and the guide structures include: an auxiliary groove, adjacent to the teeth of the large toothed disc, the auxiliary groove extends to the outer peripheral edge in an open shape, and the auxiliary groove forms a receiving surface; A dodging groove, the dodging groove is arranged behind the auxiliary groove, and the dodging groove extends to the inner peripheral edge in an open shape, the dodging groove has a first end and a second end, the second end of the dodging groove is adjacent to the auxiliary groove, the depth of the first end of the dodging groove is smaller than the depth of the second end of the dodging groove, and the outer chain The profile of the sheet is smaller than the recessed space formed by the dodging groove; Two auxiliary pins are buried on the large chainring, and the two auxiliary pins are respectively adjacent to the auxiliary grooves, and the outer edges of the auxiliary pins extend into the auxiliary grooves from the bearing surface , for the junction of the chain to contact. 6. The bicycle chainring with a guiding structure according to claim 5, characterized in that: the outline of the auxiliary groove is close to the outline formed by the joint part and the clip part on one side of the chain, and the auxiliary groove The groove has a first end and a second end, the second end is adjacent to the teeth of the large chainring, the depth of the first end of the auxiliary groove is smaller than the depth of the second end, and the receiving surface forms a recess corresponding to the shape of the chain and a convex portion, the two concave portions are formed at both ends of the convex portion, the concave portion corresponds to the joint portion of the chain, the convex portion corresponds to the locking portion of the chain, and the convex portion and the The clips of the chain do not touch each other. 7. The bicycle chainring with a guiding structure according to claim 5, characterized in that: said guiding structure has a connecting portion between said auxiliary groove and said dodging groove, said The surface of the connecting portion is connected and extended with the large toothed disc, and the width of the connecting portion is smaller than the distance between two adjacent outer chain pieces of the chain. 8. The bicycle chainring with a guiding structure according to claim 5 or 6, characterized in that: the angle between the receiving surface of the auxiliary groove and the wall surface of the auxiliary groove is not greater than ninety degrees of right angles .

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