TWM603072U - Toothed chain - Google Patents

Abstract

A toothed chain includes a plurality of inner chain links and a plurality of outer chain links arranged alternately, and a plurality of pins connecting the inner chain links and the outer chain links in series. Each inner chain link includes a plurality of inner chain pieces arranged oppositely, and each inner chain piece has two inner chain holes, which define a connecting center line passing through the center of the inner chain holes. It has an outer side surface located on one side of the connecting center line, two arc surfaces that extend from both sides of the outer side surface to the connecting center line and respectively surround the inner chain holes, and one is located at the connecting center The meshing surface on the other side of the line, two oblique cut surfaces extending obliquely from both ends of the meshing surface in the direction of the arc surfaces, and two oblique cut surfaces respectively connecting the oblique cut surfaces and the arc surfaces with diameters Longing for the protruding surface outwardly. The outer diameter of each pin is 2.70 mm. With the above-mentioned reinforcing structure of the protruding surface and the large-diameter design of the pin, the mechanical properties of the toothed chain can be improved.

Description

Toothed chain

The new model relates to a chain, especially a toothed chain for power transmission.

Referring to Figures 1 and 2, an existing toothed chain 1 is suitable for meshing with a sprocket 2. The existing toothed chain 1 includes a plurality of inner chain links 11 and a plurality of outer chain links 12 arranged in a staggered manner, and a plurality of pins 13 connected in series with the inner chain links 11 and the outer chain links 12. Each inner chain link 11 includes two opposite inner chain pieces 111, each of the inner chain pieces 111 has two spaced apart inner chain holes 112, and a tooth groove formed adjacent to one side of the sprocket 2 113, and two beveled edges 114 separately formed on both sides of the tooth groove 113, define the distance between the centers of the inner chain holes 111 as a pitch P.

Each of the outer links 12 includes two oppositely arranged outer link pieces 121 located on two sides of the inner link pieces 111 and a middle link piece 122 located between the inner link pieces 111. Each outer link piece 121 has two outer link holes 123 spaced apart. Each of the intermediate link pieces 122 has a groove 124 formed on a side adjacent to the sprocket 2, and each of the grooves 124 is correspondingly located between two adjacent tooth grooves 113, and is sequentially engaged with the Sprocket 2. The outer diameter of each pin 13 is 2.40 mm and extends through the inner chain holes 112 and the outer chain holes 123 that are connected.

Although the existing toothed chain 1 can be matched with the sprocket 2 to achieve the purpose of driving the mechanical body, when the toothed chain 1 is operating, the inner chain pieces 111 and the outer chain pieces 121 and the intermediate chains The piece 122 will be pulled in the opposite direction. From the point of view of the stress state of the chain pieces 111, 121, 122 connected in series to a single pin shaft 13, the two inner chain pieces 111 will face one The two outer chain pieces 121 and the middle chain piece 122 will receive a pulling force in the other direction. Since the opposite pulling forces are equal, each inner chain piece 111 needs to bear a greater Over time, the narrowest part 115 between each of the chamfered edges 114 and each of the inner chain holes 111 will be due to the small area of force. When the stress is concentrated here, fracture scars are likely to occur, so The existing toothed chain 1 has low tensile strength and low fatigue strength. Conversely, if the size of the inner chain holes 112 is reduced without changing the size of the pitch P of each inner chain piece 111, although the narrowest part 114 can be widened to increase the strength, this However, the pin shaft 13 is relatively thinner, resulting in poor wear resistance of the pin shaft 13. Therefore, the design of the existing toothed chain 1 still needs to be improved.

Therefore, the purpose of the present invention is to provide a toothed chain that can overcome at least one of the disadvantages of the prior art.

Therefore, the new toothed chain is suitable for meshing with a sprocket. The toothed chain includes a number of inner links and a number of outer links that are staggered along a length direction, and a number of the inner chains are connected in series. And the outer chain links so that the outer chains can save energy relative to the pin shafts of the inner chain links; each inner chain link includes a plurality of inner chain pieces arranged oppositely, and each outer chain link includes Several oppositely arranged outer chain pieces.

Each inner chain piece has two inner chain holes arranged at intervals along the length direction for the corresponding pin to pass through, defining a connecting line passing through the center of the inner chain holes, and each inner chain piece It also has an outer side surface located on one side of the connecting center line away from the sprocket, two arc surfaces that are curved from both sides of the outer side surface to the connecting center line and respectively surround the inner chain holes, One meshing surface is located on one side of the connecting center line adjacent to the sprocket and defines a tooth groove recessed toward the part between the inner chain holes in the center, and two meshing surfaces face the two ends of the meshing surface respectively. The oblique cut surface extending obliquely in the direction of the arc surface, and two protruding surfaces respectively connecting the oblique cut surface and the arc surface and protruding radially outward; the outer diameter of each pin is 2.70mm.

The effect of the present invention is that the above-mentioned reinforcement design of the protruding surface and the large diameter design of the pin shaft can indeed improve the mechanical properties of the toothed chain.

Referring to Figures 3, 4, and 5, an embodiment of the toothed chain 4 of the present invention is suitable for meshing with a sprocket 3 having a plurality of clamping teeth 31 formed on the periphery at angular intervals. The toothed chain 4 includes a plurality of inner chain links 5 and a plurality of outer chain links 6 staggered along a length direction 40, and a plurality of branches are arranged at intervals along the length direction 40 and are connected in series with the inner chain links 5 and The pins 7 of the outer links 6 can pivot relative to the inner links 5.

Each inner link 5 includes two oppositely arranged inner chain pieces 51, and each of the inner chain pieces 51 has two inner chain holes arranged at intervals along the length direction 40 and for the corresponding pin 7 to pass through. 52, and a tooth groove 53 formed adjacent to the center of one side of the sprocket 3 and recessed toward the part between the inner chain holes 52. A connecting center line 50 passing through the center of the inner chain holes 52 is defined, and each inner chain piece 51 also has an outer side surface 511 located on the side of the connecting center line 50 away from the sprocket 3, and two outer sides 511 respectively formed by the Both sides of the outer side surface 511 are curved arcs extending to the connecting center line 50 and respectively surrounding the arc surfaces 512 of the inner chain holes 52, a meshing surface 513 located on a side of the connecting center line 50 adjacent to the sprocket 3, Two oblique surfaces 514 extending obliquely from both ends of the engagement surface 513 in the direction of the arc surfaces 512, and two respectively connecting the oblique surfaces 514 and the arc surfaces 512 and protruding radially outward的projecting surface 515. The meshing surface 513 has two convex tooth surfaces 516 corresponding to the inner chain holes 52 and protruding toward the sprocket 3 respectively, and a groove connecting the convex tooth surfaces 516 and defining the tooth groove 53 Face 517. Each of the protruding surfaces 515 has a circular arc surface 518 connected to the corresponding circular arc surface 512 and a connecting surface 519 curvedly connected to the corresponding chamfered surface 514 by the circular arc surface 518.

Each outer chain link 6 includes two outer chain pieces 61 arranged oppositely and located between the two sides of the two adjacent inner chain links 5, and an intermediate piece 61 arranged opposite to the outer chain pieces 61 The middle chain piece 62 between the inner chain pieces 51. Each outer chain piece 61 has two outer chain holes 63 arranged at intervals along the length direction 40 for the corresponding pin 7 to pass through. The middle chain piece 62 has a groove 64 recessed on a side adjacent to the sprocket 3. The slot 64 is correspondingly located between two adjacent tooth slots 53 along the length direction 40.

It should be noted that the number of the inner chain pieces 51 of each inner chain link 5 is not limited to two, and can be three, four... etc. according to actual needs, while the number of the middle chain pieces 62 is less than these. There is one inner chain piece 51, and it is arranged staggered between the inner chain pieces 51. Of course, the arrangement of the middle chain piece 62 can also be omitted in the design, and the inner chain pieces 51 are combined or formed into one body. One, no more examples here.

Each of the pin shafts 7 passes through the inner chain holes 52 and the outer chain holes 63 that are connected perpendicular to the length direction 40, and is punched with two expansion grooves 71 on both ends respectively, and the ends can be enlarged The outer diameter of the edge is used to position the outer chain pieces 61.

To further explain the size of each part of the above-mentioned components, in this embodiment, the aperture ψ1 of each inner chain hole 52 is 2.75mm, and the distance between the centers of the inner chain holes 52 of each inner chain piece 51 is defined as one Pitch P, the pitch P is 6.35mm. The center of each arc surface 512 is the same as the center of the corresponding inner chain hole 52, and the radius of curvature is 0.441P. The shortest distance between the chamfered surface 514 and the center of the inner chain hole 52 is 0.394P, which is located at the connecting surface 519 connecting the protruding surface 515. The center of the arc surface 518 of each protruding surface 515 is the same as the center of the corresponding arc surface 512, and the radius of curvature is 0.441P. The hole diameter ψ2 of each outer link hole 63 is 2.70 mm. The outer diameter d of each pin 7 is 2.70 mm. However, the above-mentioned dimensions can also be changed in implementation, which is not limited to this embodiment.

When the toothed chain 4 is operating, when the inner chain pieces 51, the outer chain pieces 61 and the intermediate chain pieces 62 are pulled in opposite directions, each of the inner chain pieces 51 can use the The protruding surface 515 is designed to strengthen the structure and increase the force-bearing area, so that the force is complete and even, and it is not prone to fracture scars. Therefore, the tensile strength and fatigue strength of the toothed chain 4 can be improved. In addition, the toothed chain 4 can relatively increase the outer diameter of the pin shafts 7 when the mechanical properties of the inner chain pieces 51 are further optimized, so that the pulling force can be dispersed and the wear resistance can be improved. .

In summary, the new toothed chain 4, through the above-mentioned reinforcing structure of the protruding surface 515 and the large diameter design of the pin 7, can have the effects of high tensile strength, high fatigue strength, and good wear resistance. It can indeed improve the mechanical properties of the toothed chain 4 and achieve the purpose of new-style cost.

However, the above-mentioned are only examples of the present model, and should not be used to limit the scope of implementation of the present model, all simple equivalent changes and modifications made in accordance with the patent scope of the present model application and the contents of the patent specification still belong to This new patent covers the scope.

3: sprocket 31: stuck teeth 4: toothed chain 40: length direction 5: inner link 50: Connect the heart line 51: inner chain piece 52: inner chain hole 53: cogging 511: outer side 512: arc surface 513: Meshing surface 514: Bevel 515: protruding surface 516: Convex Tooth Face 517: Groove Face 518: arc face 519: Connect Face 6: Outer link 61: outer chain piece 62: middle chain 63: outer chain hole 64: card slot 7: Pin shaft 71: Expansion ψ1: Aperture ψ2: Aperture P: Pitch d: outer diameter

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is an incomplete partial exploded side view, illustrating that an existing toothed chain is suitable for meshing with a sprocket; Figure 2 is a partial exploded top view illustrating the structure of the existing toothed chain; Figure 3 is an incomplete partial exploded side view, illustrating that an embodiment of the new toothed chain is suitable for meshing with a sprocket; Figure 4 is a partially exploded top view illustrating the structure of this embodiment; and Fig. 5 is an enlarged side view illustrating an inner link of the embodiment.

50: Connect the Heart Line

51: inner chain piece

52: inner chain hole

53: cogging

511: outer side

512: arc surface

513: Meshing surface

514: Bevel

515: protruding surface

516: Convex Tooth Face

517: Groove Face

518: arc face

519: Connect Face

ψ 1: Aperture

P: Pitch

Claims (8)

A toothed chain suitable for meshing with a sprocket. The toothed chain comprises: a plurality of inner chain links and a plurality of outer chain links staggered along a length direction, and a plurality of branches connected in series with the inner chain links and The outer chain links enable the outer chains to save energy relative to the pin shafts of the inner chain links pivoting; each inner chain link includes a plurality of relatively arranged inner chain pieces, and each outer chain link includes a plurality of Relatively set outer chain pieces; Each inner chain piece has two inner chain holes arranged at intervals along the length direction for the corresponding pin to pass through, defining a connecting line passing through the center of the inner chain holes, and each inner chain piece It also has an outer side surface located on one side of the connecting center line away from the sprocket, two arc surfaces that are curved from both sides of the outer side surface to the connecting center line and respectively surround the inner chain holes, One meshing surface is located on one side of the connecting center line adjacent to the sprocket and defines a tooth groove recessed toward the part between the inner chain holes in the center, and two meshing surfaces face the two ends of the meshing surface respectively. The oblique cut surface extending obliquely in the direction of the arc surface, and two protruding surfaces respectively connecting the oblique cut surface and the arc surface and protruding radially outward; the outer diameter of each pin is 2.70mm. The toothed chain according to claim 1, wherein the distance between the centers of the inner chain holes of each inner chain piece is defined as a pitch P, and the shortest distance between each of the chamfered surface and the center of the inner chain hole The distance is 0.394P. The toothed chain according to claim 2, wherein the radius of curvature of each arc surface is 0.441P. The toothed chain according to claim 3, wherein the pitch P is 6.35 mm. The toothed chain according to claim 2, 3 or 4, wherein the diameter of each inner chain hole is 2.75 mm. The toothed chain according to claim 5, wherein each of the protruding surfaces has an arc surface connecting the corresponding arc surface and having a radius of curvature of 0.441P, and a curved surface connected to the corresponding arc surface by the arc surface Correspond to the connecting face of the chamfered surface. The toothed chain according to claim 1, wherein each of the outer links includes two outer links located on both sides of two adjacent inner links, and each outer link has two A number of outer chain holes arranged at intervals along the length direction for the corresponding pin to pass through, and the hole diameter of each outer chain hole is 2.70mm. The toothed chain according to claim 7, wherein each of the outer links further includes at least one intermediate link arranged opposite to the outer links and interposed between the inner links, the at least one The middle chain piece has a slot recessed on one side adjacent to the sprocket, and the slot is correspondingly located between two adjacent tooth slots along the length direction.

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