CN113137455A

CN113137455A - Inner chain sheet

Info

Publication number: CN113137455A
Application number: CN202010067856.6A
Authority: CN
Inventors: 吴瑞章
Original assignee: Guimeng Chain Shenzhen Co ltd
Current assignee: Guimeng Chain Shenzhen Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2021-07-20

Abstract

An inner chain sheet comprises two end parts arranged at intervals along a length direction, a connecting part connected between the end parts, and an inner surface formed by the end parts and the connecting part together. Each end includes an assembly aperture. One end portion further comprises an extension section extending along the length direction. The distance from the center of the assembling hole to the periphery of the end part along the length direction is a. The distance from the center of the assembling hole to the periphery of the end part along a width direction is b, and a is more than b. The inner surface comprises a first chamfer area positioned at the periphery of the inner surface and a second chamfer area formed on the extension section and positioned between the first chamfer area and the assembling hole. The end portion and the connecting portion also form an outer surface opposite the inner surface. The inner surface is formed with a groove that is concave toward the outer surface. The groove has parallel spaced groove edges on both sides. Because the inner chain sheet comprises the extension section, the distance a is greater than the distance b, the extension length is increased, and the first chamfer area and the second chamfer area are formed, the effect of being beneficial to the smooth and stable combination of the chain wheel and the chain can be generated.

Description

Inner chain sheet

Technical Field

The present invention relates to a chain component, and more particularly to an inner link that cooperates with an outer link and other chain elements to form a chain.

Background

Referring to fig. 1, a conventional chain includes a plurality of outer links 11, a plurality of inner links 12, and a plurality of link shafts 13 connecting the inner links 12 and the outer links 11 in series. The outer chain link 11, the inner chain link 12 and the chain axle 13 cooperate to define a plurality of chain spaces 14 (only one chain space 14 is shown as a representative) into which a plurality of teeth (not shown) of a sprocket (not shown) can be inserted.

Referring to fig. 2, one of the inner links 12 is illustrated. The inner link 12 includes two end portions 121 arranged at intervals in a longitudinal direction, a connecting portion 122 connected between the end portions 121, and two protruding rings 123 protruding from the end portions 121, respectively. Each end 121 defines an assembly aperture 124 therethrough.

The inner link 12 further includes an inner surface 125 and an outer surface 126 formed by the end portion 121 and the connecting portion 122. The inner surface 125 comprises two annular surface areas 127 surrounding the protruding ring 123 and a connecting surface area 128 connected between the annular surface areas 127.

Since the annular surface area 127 is simply in a circular plane shape without any guiding design, when each tooth of the sprocket is inserted into the respective chain space 14, each tooth is easily collided or even stuck with the end portion 121, and cannot be inserted smoothly, which is to be further improved.

In order to solve the above problems, the applicant of the present invention proposed patents I276751 and I617749 in addition to the patent I663097 in taiwan, but the market demand for silence and smooth speed change has been further increased in recent years, and further improvement is needed.

Disclosure of Invention

The object of the present invention is to provide an inner link that overcomes at least one of the drawbacks of the prior art.

The inner chain sheet comprises two end parts, a connecting part and an inner surface.

The end portions are arranged at intervals along a length direction, and each end portion includes an assembling hole. One end of the connecting rod comprises an extension section extending along the length direction. The distance from the center of the assembling hole to the periphery of the end part along the length direction is a. The distance from the center of the assembling hole to the periphery of the end part along a width direction is b, and a is more than b. The connecting portion is connected between the end portions.

The inner surface is formed by the end part and the connecting part together, and comprises a first chamfer area positioned on the periphery of the inner surface and a second chamfer area positioned on the extending section. The second chamfer area is positioned between the first chamfer area and the assembling hole.

Wherein the end portion and the connecting portion further form an outer surface opposite to the inner surface. The inner surface is formed with a groove that is concave toward the outer surface. The groove has parallel spaced groove edges on both sides.

Further, the second chamfer area is curved along the shape of the assembling hole.

Further, the second chamfer area is in the shape of a brow and moon.

Further, the inner surface includes two third chamfered regions extending along the length and spaced apart around the periphery of the groove.

Further, the inner surface further includes a planar area located between the third chamfered sections, and a width of the planar area in the width direction is not greater than two-thirds of a hole diameter of the assembly hole.

Further, the inner surface includes two annular zones surrounding the assembly hole, respectively.

Further, the assembly structure further comprises two protruding rings which are respectively connected with the end parts, respectively surround the assembly holes and protrude inwards from the inner surface.

Further, the chamfered angle of the first chamfer area is greater than or equal to the chamfered angle of the second chamfer area.

Further, another end portion includes the extension section extending along the length direction, the distance from the center of the assembling hole of the another end portion to the periphery of the end portion is a, the distance from the center of the assembling hole to the periphery of the end portion along the width direction is b, and a > b.

The inner chain sheet has the following effects: the extension is included such that the distance a is greater than the distance b to increase the extension length, and the first and second chamfered portions are formed to facilitate smooth and stable engagement of the sprocket.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view illustrating a prior art chain;

FIG. 2 is a perspective view illustrating a conventional inner link;

FIG. 3 is a perspective view illustrating a first embodiment of the inner link of the present invention;

FIG. 4 is a top view illustrating the first embodiment;

FIG. 5 is a cross-sectional view taken along a length to illustrate the first embodiment;

FIG. 6 is a fragmentary cross-sectional view taken in the same manner as FIG. 5, with portions of the first embodiment enlarged;

FIG. 7 is a cross-sectional view taken along a width direction illustrating the first embodiment;

fig. 8 is a sectional view illustrating a chain constituted by the first embodiment;

fig. 9 is a sectional view, partially enlarged, showing the chain;

FIG. 10 is a top plan view illustrating a second embodiment of the inner link plate of the present invention;

FIG. 11 is a perspective view illustrating a third embodiment of the inner link of the present invention; and

fig. 12 is a fragmentary sectional view, partially enlarged, illustrating the third embodiment.

Detailed Description

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

Referring to fig. 8, a first embodiment of the inner link 2 of the present invention is adapted to cooperate with another plurality of inner links 2 of the same construction and other chain elements (e.g., a plurality of outer links 81 and a plurality of link shafts 82) to form a chain 83, the chain 83 defining a plurality of chain spaces 84 (only one of which is illustrated).

Referring to fig. 3 to 5, the inner link 2 includes two end portions 3, a connecting portion 4, and two protruding rings 5. The end portions 3 are spaced apart along a length direction D1, each end portion 3 is substantially semi-elliptical and includes a chain hole section 31 defining a through assembly hole 311, and an extension section 32 extending from the chain hole section 31 in a direction away from the other end portion 3 along the length direction D1. The distance from the center 312 of the assembling hole 311 to the periphery of the end portion 3 along the length direction D1 is a, the distance from the center 312 of the assembling hole 311 to the periphery of the end portion 3 along a width direction D2 perpendicular to the length direction D1 is b, and a > b. The connecting portion 4 is connected between the end portions 3. The protruding rings 5 surround the assembly holes 311 and protrude from the end portions 3 in the direction of the other inner link 2, respectively.

Referring to fig. 4 to 7, the inner link 2 includes, in view of the surface profile of the inner link 2, an inner surface 6 and an outer surface 7 which are opposite to each other and are formed by the connecting portion 4 and the end portion 3 together.

The inner surface 6 includes two first chamfer areas 61 formed on the periphery of the end portion 3, two second chamfer areas 62 formed on the extension portion 32, two annular areas 66 formed on the chain hole portion 31 and surrounding the assembly hole 311, a planar area 63 formed on the connecting portion 4, a groove 67 recessed from the planar area 63 to the outer surface 7 and having parallel, spaced and linearly extending groove edges 671 on both sides, two curved areas 64 connecting the groove edges 671 and the annular areas 66 and extending in the width direction D2, and two third chamfer areas 65 extending along the periphery of the connecting portion 4 in the length direction D1 and spaced and located on opposite sides of the planar area 63.

Each first chamfer area 61 extends from the ring surface area 66 to the periphery of the end portion 3 and gradually inclines towards the outer surface 7, and each second chamfer area 62 extends from the ring surface area 66 to the periphery of the extending section 32 and gradually inclines towards the outer surface 7. The chamfer angle 621 of the second chamfer area 62 of the first embodiment is smaller than the chamfer angle 611 of the first chamfer area 61, so that the shape of each extending section 32 is a crescent shape (crescent shape), and when the chamfer angle 621 of each second chamfer area 62 is increased or decreased according to design requirements, the shape and size of each extending section 32 are changed accordingly.

And the width 631 of the planar area 63 in the width direction D2 is no greater than two-thirds of the aperture 313 of each assembly hole 311.

Referring to fig. 3, 8 and 9, the inner link 2 is characterized in that: under the condition that the central position of the assembling hole 311 is maintained unchanged, the length of the inner chain piece 2 is extended, that is, the end portions 3 are respectively protruded along the length direction D1 to form the extending sections 32, so that the length of the end edge of the inner chain piece 2 extending into the chain space 84 is longer, when the chain 83 and a sprocket 9 operate, in the process of inserting the gear teeth 91 of the sprocket 9 into the chain space 84, the extended extending sections 32 of the end portions 3 can be contacted with each other early, so as to guide the gear teeth 91 to be inserted into the chain space 84 firmly as soon as possible, thereby achieving the positioning effect of aligning the chain 83 early and smoothly meshing with the sprocket 9, and shortening the unstable condition of the initial meshing of the chain 83 and the gear teeth 91. In addition, the inclined chamfer design of the second chamfer area 62 can further increase the contact area between the inner chain plate 2 and the gear teeth 91, thereby reducing the generation of noise during operation.

It should be noted that when the chamfer angle 621 of the second chamfer area 62 is smaller, the inclined slope thereof is longer, which is helpful for the gear teeth 91 to slide into the chain space 84 along the slope, so that the transmission between the sprocket 9 and the chain 83 is smoother. When the width 631 of the planar area 63 along the width direction D2 is smaller, the chamfered area of the third chamfered area 65 is enlarged, the chamfered curvature can be smoother, and the gear teeth 91 can smoothly enter the chain space 84, so as to increase smooth speed change.

Referring to fig. 10, a second embodiment of the inner link 2 of the present invention is similar to the first embodiment except that: the design of the inner chain link 2 of the second embodiment, including the extension portion 32 and the first and second

chamfered portions

61 and 62, only one of the end portions 3 defining the chain space 84 can also facilitate smooth and stable engagement of the chain 83 with the sprocket 9.

Referring to fig. 11 and 12, a third embodiment of the inner link 2 of the present invention is similar in construction to the first embodiment except that: each first chamfered portion 61 of the third embodiment is combined with the corresponding second chamfered portion 62 to form a new chamfered portion, which can prevent stress concentration in addition to the smooth and stable engagement effect.

In summary, the inner link sheet of the present invention has the following effects: the extension 32 is included so that the distance a is greater than the distance b to increase the extension length, and the first and second

chamfered portions

61 and 62 are formed to facilitate smooth and stable engagement of the sprocket 9 with the chain 83 of the inner links of the present invention.

The above description is only an example of the present invention, and the claims of the present invention are not limited thereto, and the equivalent modifications made according to the claims and the description of the present invention should be covered by the claims of the present invention.

Claims

1. An inner link, comprising:

two end parts which are arranged at intervals along a length direction, wherein each end part comprises an assembly hole, one end part comprises an extension section which extends along the length direction, the distance from the center of the assembly hole to the periphery of the end part along the length direction is a, the distance from the center of the assembly hole to the periphery of the end part along a width direction is b, and a is more than b;

a connecting part connected between the end parts; and

the inner surface is formed by the end part and the connecting part together and comprises a first chamfer area positioned on the periphery of the inner surface and a second chamfer area positioned on the extending section, and the second chamfer area is positioned between the first chamfer area and the assembling hole;

the end part and the connecting part also form an outer surface opposite to the inner surface, the inner surface is provided with a groove which extends towards the outer surface in a concave way, and two sides of the groove are provided with parallel and spaced groove edges.

2. The inner link according to claim 1, wherein the second chamfered portion is curved along the shape of the assembling hole.

3. The inner link according to claim 1, wherein the second chamfered region has a brow-moon shape.

4. The inner link as set forth in claim 1 wherein the inner surface further includes two third chamfered regions extending along the length and spaced apart around the periphery of the groove.

5. The inner link according to claim 4, wherein the inner surface further comprises a flat area located between the third chamfered sections, and the width of the flat area in the width direction is not more than two thirds of the diameter of the assembly hole.

6. The inner link according to claim 1, wherein the inner surface further comprises two annular zones surrounding the assembly holes, respectively.

7. The inner link according to claim 1, further comprising two protruding rings respectively connected to the ends and respectively surrounding the assembly holes and protruding inward from the inner surface.

8. The inner link as set forth in claim 1 wherein the first chamfered region is chamfered at an angle greater than the second chamfered region.

9. The inner link as set forth in claim 1 wherein the first chamfered section is chamfered at an angle equal to the second chamfered section.

10. The inner link according to claim 1, wherein the other end portion includes an extension extending in the length direction, the distance from the center of the assembling hole of the other end portion to the end portion periphery is a, the distance from the center of the assembling hole to the end portion periphery in the width direction is b, and a > b.