CN211943645U

CN211943645U - Soft tooth insert and easy-to-disassemble and-assemble tooth-inlaid chain wheel

Info

Publication number: CN211943645U
Application number: CN202020552386.8U
Authority: CN
Inventors: 张德耀
Original assignee: High-Tech Industrial Development Zone Chuanghong Machinery Factory
Current assignee: High-Tech Industrial Development Zone Chuanghong Machinery Factory
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-11-17
Anticipated expiration: 2030-04-13

Abstract

The utility model discloses a soft tooth insert and an easily-detachable inserted sprocket, wherein the soft tooth insert is arranged on a sprocket body and forms a complete inserted sprocket together with a hard tooth insert, has at least one sprocket and consists of a soft tooth insert body and a sprocket, the soft tooth insert body is provided with a convex-concave matching part matched with an adjacent hard tooth insert, and the convex-concave matching part extends along the tooth width direction; the soft tooth insert body is formed with a radial extension portion on only one side in the tooth width direction for forming positioning in the tooth width direction of the sprocket with the sprocket body. The insert sprocket has the aforementioned soft tooth insert. The utility model has the advantages that the soft tooth insert has simple structure, convenient assembly and disassembly and low use cost; the chain wheel is an inserted chain wheel which is convenient to detach and replace and is formed by two kinds of chain tooth inserts made of different materials and hardness, so that the maintenance and the replacement are convenient, resources are saved, the manufacturing cost is low, and the running noise is low; it is especially suitable for the driven chain wheel of motorcycle or bicycle.

Description

Soft tooth insert and easy-to-disassemble and-assemble tooth-inlaid chain wheel

Technical Field

The utility model relates to an inlay the tooth sprocket, concretely relates to soft tooth is inserted and easy dismouting inlay tooth sprocket.

Background

Bicycles and motorcycles mostly adopt a chain transmission mode to transmit power, wherein chain wheels comprise a driving chain wheel and a driven chain wheel, and the chain wheels are also called small chain wheels and large chain wheels in the industry. Existing sprockets include both unitary and insert constructions. The integral structure is that the sprocket is processed on the sprocket body, and the sprocket of the insert structure is provided with a sprocket insert on the sprocket body. The chain wheel body and the chain teeth of the inserted chain wheel can be processed respectively, the processing time can be correspondingly shortened, and the chain wheel body and/or the chain teeth can be replaced independently after being damaged, so that the parts without damage can be fully utilized, and the use cost is saved. At present, all inserts of most of the inserted chain wheels are usually made of a hard material, so that the manufacturing cost is high, and the noise is high in the using process. Therefore, the inserts made of different materials are adopted by the technical personnel in the field to reduce noise, and the soft tooth insert used as the noise reduction is usually clamped on the chain wheel body through a U-shaped groove and forms a convex-concave matching structure with the hard tooth insert. In the using process, the soft tooth insert is usually short in service life and is replaced more frequently, and the soft tooth block with the structure has the problem of inconvenience in replacement. For this reason, further improvement is required.

Disclosure of Invention

The utility model discloses a first purpose is to insert the inconvenient defect of change to the soft tooth of current inserted tooth sprocket, provides an inserted tooth sprocket, and this soft tooth is inserted and is set to only unilateral and lean on the sprocket body, combines to insert convex-concave complex structure with hard tooth to bulldoze from one side of sprocket and can pull down or load on soft tooth and insert, thereby improve easy dismounting nature. The second objective of the present invention is to provide an easy-to-assemble/disassemble dental inlay sprocket with the aforementioned soft teeth insert.

In order to realize the first purpose, the utility model provides a soft tooth inserts technical scheme as follows.

A soft tooth insert is used for being arranged on a chain wheel body to form a complete inserted chain wheel together with a hard tooth insert, has at least one chain tooth and consists of a soft tooth insert body and the chain tooth, wherein the soft tooth insert body is provided with a convex-concave matching part matched with the adjacent hard tooth insert, and the convex-concave matching part extends along the tooth width direction; the soft tooth insert body is provided with a radial extension part on one side in the tooth width direction, and the radial extension part is used for forming positioning in the tooth width direction of the chain tooth with the chain wheel body.

Adopt aforementioned technical scheme the utility model discloses, because soft tooth is inserted and is inserted the convex-concave cooperation structure that forms the tooth width direction extension with adjacent hard tooth, and only the unilateral is equipped with radial extension portion, the event can be convenient install and remove soft tooth from sprocket body one side and insert to improve easy dismounting nature.

Preferably, the thickness of the soft tooth insert body is larger than the width of the sprocket, circular arc-shaped outer edges are formed on two sides of the soft tooth insert body in the thickness direction of the sprocket, and the circular arc diameter of the outer edges is smaller than the tooth root diameter of the sprocket. The load of the tooth part of the soft tooth insert is reduced, and the service life of the insert is prolonged.

Preferably, the male and female fitting parts are in a semicircular key-shaped fitting structure. The structural stress of the component is reduced through the spherical arc structure, and the service life of the insert is prolonged.

Preferably, the soft tooth insert has 1-5 sprockets; the soft tooth insert is made of non-metallic materials. So as to meet the requirements of different tooth numbers, ensure that the hardness is lower than that of the hard tooth insert and reduce the manufacturing cost. Preferably nylon, to further improve wear resistance and to adequately absorb shock and reduce noise.

In order to achieve the second objective, the present invention adopts the following technical solutions.

An easy-to-assemble and disassemble inserted sprocket comprises a sprocket body and a plurality of sprocket inserts provided with sprockets; the sprocket insert consists of a plurality of hard tooth inserts and a plurality of soft tooth inserts which are arranged in a staggered manner; the hard tooth insert is fixedly connected to the chain wheel body through a screw or a rivet, and the hard tooth insert and the soft tooth insert are connected through a first convex-concave matching structure extending in the tooth width direction; the soft tooth insert is formed by a soft tooth insert for realizing the first invention purpose; the radial extension of the soft tooth insert abuts against one side of the sprocket body.

Adopt aforementioned technical scheme the utility model discloses, insert and constitute complete combination sprocket structure by a plurality of hard teeth that crisscross set up and a plurality of soft teeth, be convenient for insert through the change and reduce use cost. The chain wheel load is mainly born by the hard tooth insert, the soft tooth insert plays a role in buffering and smooth connection, the soft tooth insert can be made of materials with relatively wear-resistant performance, relatively low hardness and relatively low price, such as reinforced plastics or nylon and the like, and can be manufactured in a large batch by adopting an injection molding or extrusion molding mode, so that the manufacturing cost can be effectively reduced. The soft tooth insert and the adjacent hard tooth insert form a convex-concave matching structure extending in the tooth width direction, and only one side of the soft tooth insert is provided with the radial extension part, so that the soft tooth insert can be conveniently assembled and disassembled from one side of the chain wheel body, and the assembly and disassembly convenience is improved. The chain wheel utilizes the characteristics of low hardness and high wear resistance of the soft tooth insert and the characteristic that the width of the chain tooth is greater than that of the hard tooth insert, so that the hard collision friction contact between the hard tooth insert and the chain can be effectively reduced, the purpose of reducing noise is realized, and the silencing effect is achieved.

Preferably, a plurality of crescent-shaped sunken tables used for arranging the hard tooth inserts respectively are formed on the chain wheel body, and the sunken tables are used for bearing the bearing surfaces of the hard tooth inserts and flush with the back surface of the chain wheel body. The hard tooth insert is arranged on the sinking platform to ensure the integral strength of the chain wheel, and the bearing surface of the sinking platform is flush with the back surface of the chain wheel body, so that when the chain wheel with the original common structure is replaced on a motorcycle or a bicycle, the change of the installation position can not occur, the quantity and the thickness of gaskets can not be increased or decreased correspondingly, and the interchangeability with the original chain wheel can be ensured.

Preferably, the hard tooth insert is fixed by at least one screw or rivet; the inner edge and the two side walls of the sinking platform are used for forming a three-side frame-shaped embedded positioning structure; and in the scheme that the hard tooth insert is fixed by one screw or rivet, a second convex-concave matching structure with a hemispherical outline shape is formed between the hard tooth insert and the bearing surface. The hard tooth insert forms a firm and reliable fixed connection structure through the three-side-frame-shaped embedded positioning structure and the screw fixation, and ensures that radial load can be reliably transmitted to the chain wheel body, thereby ensuring the service life. The number of the screws and the rivets is selected according to the arc length of the insert, and can be one, two or three; however, in order to prevent the insert from being deformed by heat treatment, the arc length is correspondingly limited under the condition that the thickness of the insert is constant, and two screws or rivets are usually adopted for fixing the insert in a longer period. In a scheme of fixing by a screw or a rivet, a second convex-concave matching structure with a hemispherical outline shape is formed between the hard tooth insert and the bearing surface. When the number of the inserted block chain teeth is small and the arc length is relatively small, one screw or rivet is fixed by means of positioning through the convex-concave matching structure, so that the structure is simplified, the weight is reduced and the cost is saved on the premise of ensuring the installation firmness.

It is further preferred that in the solution where the hard tooth insert is fixed by one screw, there is a radial position difference between the screw hole for setting the screw and the screw through hole for penetrating the screw, so that the screw forms a radial compression of the hard tooth insert. The mode that the screw setting holes on the two components are eccentric eliminates the clearance of the single side of the thread fit, and further improves the firmness and reliability of the connection between the insert and the chain wheel body.

Preferably, the hard tooth insert is made of alloy materials, and the number of the sprockets on the hard tooth insert is larger than that of the sprockets on the soft tooth insert. The material strength requirement of the chain wheel body is reduced on the premise of ensuring normal bearing capacity, service life and low noise of the chain wheel, and the manufacturing cost of the chain wheel is further reduced. The use noise is reduced. The number of teeth of the hard tooth insert and the number of teeth of the soft tooth insert are determined according to a wrap angle formed by the chain on the chain wheel, and the larger the wrap angle is, the more the number of teeth of the soft tooth insert is, and the smaller the number of teeth of the soft tooth insert is, otherwise, the larger the wrap angle is. Hard tooth inserts and soft tooth inserts on the same sprocket can all select the same or different number of teeth according to aforementioned principle, and the distribution of each number of teeth carries out the rational selection according to the total number of teeth of sprocket to every has an integer whole sprocket as the principle on inserting, and the connecting portion uses tooth's socket central symmetry plane as the faying face between the sprocket that adjacent inserted. Normally, the width of the soft tooth is the same as or slightly thinner than that of the hard tooth, and the soft tooth can also be slightly thicker, so that when the tooth width of the soft tooth insert is larger than that of the hard tooth insert, the noise can be further reduced. The number of the teeth on the hard tooth insert is generally set to be 3-15, and when the number of the teeth is larger, measures for reducing quenching deformation, including structural measures, should be considered.

Preferably, the diameter of the top circle of the chain wheel body is smaller than the diameter of the root circle of the chain teeth on the chain tooth insert; the edge of the sprocket body, which is positioned at the soft tooth insert part, is inwards sunken. The diameter of the top circle is smaller than that of the tooth root circle of the sprocket, so that the interference between a roller of the chain and the sprocket body can be avoided, and the contact between a chain plate of the chain and the sprocket body can be avoided through reasonable arrangement, so that the operation noise is reduced; the edge of the sprocket body, which is positioned at the soft tooth insert part, is inwards sunken, so that the size, strength and service life of the soft tooth insert body of the soft tooth insert are increased.

The utility model discloses following beneficial effect has: the soft tooth insert has simple structure, convenient assembly and disassembly and low use cost; the chain wheel is an inserted chain wheel which is convenient to detach and replace and is formed by two kinds of chain tooth inserts made of different materials and hardness, so that the maintenance and the replacement are convenient, resources are saved, the manufacturing cost is low, and the running noise is low; it is especially suitable for the driven chain wheel of motorcycle or bicycle.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic front structural view of embodiment 1 of the present invention.

Fig. 3 is a schematic back view of embodiment 1 of the present invention.

Fig. 4 is a schematic front structural view of embodiment 2 of the present invention.

Fig. 5 is a schematic back structure diagram of embodiment 2 of the present invention.

Fig. 6 is a schematic structural view of the sprocket body according to embodiment 2 of the present invention.

Fig. 7 is A rotary cross-sectional view A-O-A of fig. 6 according to the present invention.

Fig. 8 is a schematic structural view of a hard tooth insert in embodiment 2 of the present invention.

Fig. 9 is a schematic front structural view of embodiment 3 of the present invention.

Fig. 10 is a schematic view of the connection relationship between the sprocket body and the hard tooth insert in embodiment 3 of the present invention.

Fig. 11 is a sectional view of a sprocket body settling portion in embodiment 3 of the present invention.

Fig. 12 is a schematic front structural view of a hard tooth insert in embodiment 3 of the present invention.

Fig. 13 is a schematic back structure view of a hard tooth insert in embodiment 3 of the present invention.

Fig. 14 is a sectional view of the convex-concave mating part of the hard tooth insert in embodiment 3 of the present invention.

Detailed Description

The present invention will be further described with reference to the following drawings, which are illustrative only for the purpose of disclosing and explaining the present invention in order to fully understand the present invention, but not to limit the present invention within the scope of the described embodiments.

Embodiment 1, referring to fig. 1, 2, 3, a soft tooth insert for mounting on a sprocket body 1 to constitute a complete insert sprocket together with a hard tooth insert 2, having at least one tooth, and consisting of a soft tooth insert body 3a and a tooth 3b, the soft tooth insert body 3a having a convex-concave fitting portion 3d to be fitted with an adjacent hard tooth insert, the convex-concave fitting portion extending in a tooth width direction; the soft tooth insert body 3a is formed with a radially extending portion 3c on only one side in the tooth width direction, and the radially extending portion 3c is used for positioning in the tooth width direction of the sprocket body 1.

The thickness B1 of the soft tooth insert body 3a is larger than the width B2 of the zipper teeth 3B, the two sides of the soft tooth insert body 3a in the thickness direction of the zipper teeth are both provided with circular arc-shaped outer edges, and the circular arc diameter D1 of the outer edges is smaller than the tooth root diameter D2 of the zipper teeth 3B; the convex-concave matching parts on the two sides are in a semicircular key-shaped matching structure; the soft tooth insert is provided with 1-5 sprockets; the soft tooth insert 3 is made of nylon made of non-metallic materials.

In this embodiment, the soft tooth insert 3 may also be made of engineering plastics, reinforced plastics, or other materials.

The convex-concave matching part on the soft tooth insert can be in a convex structure or a concave structure, and only the structure matched with the hard tooth insert is needed.

Embodiment 2, referring to fig. 4, 5 and 6, an easy-to-assemble and disassemble insert sprocket comprises a sprocket body 1 and a plurality of sprocket inserts provided with sprockets; waist-shaped mounting holes 1e with two specifications are formed in the chain wheel body 1, and the length direction of each waist-shaped mounting hole 1e extends along the radial direction of the chain wheel; the sprocket insert consists of a plurality of hard tooth inserts 2 and a plurality of soft tooth inserts 3 which are arranged in a staggered manner; the hard tooth insert 2 is fixedly connected to the chain wheel body 1 through a screw or a rivet, and the hard tooth insert 2 is connected with the soft tooth insert 3 through a convex-concave matching structure extending in the tooth width direction; the soft tooth insert 3 is composed of the soft tooth insert described in embodiment 1; the radially extending portion 3c of the soft tooth insert abuts against the face side of the sprocket body 1. The male-female fitting structure is formed by fitting a groove 2d formed on the hard tooth insert 2 and a projection 3d formed on the soft tooth insert 3.

Referring to fig. 7 and 8, a plurality of crescent-shaped sunken tables 1a for respectively arranging the hard tooth inserts 2 are formed on the sprocket body 1, and the sunken tables 1a are used for bearing surfaces 1aa of the hard tooth inserts 2 to be flush with the back surface 1ab of the sprocket body 1. Wherein, the hard tooth insert 2 is fixed by two screws 4; the inner edge and two side walls of the sinking platform 1a are used for forming a three-side frame-shaped embedded positioning structure. The screw hole for setting the screw 4 and the screw through hole 2a for penetrating the screw have a radial position difference therebetween to form radial compression of the hard tooth insert 2 by the screw. Specifically, the chain wheel body 1 is provided with screw holes 1b of M6 or M8, and the mounting screw holes 1b are distributed on the circumference with the radius of r 1; the hard tooth insert 2 is provided with a screw through hole 2a for penetrating a screw, and the radius of a circle where the center of the screw through hole 2a is r2, wherein r1 is smaller than r2, and the value range is usually 0.25mm-0.60 mm.

The hard tooth insert 2 is made of alloy materials, and the number of the chain teeth on the hard tooth insert 2 is larger than that of the chain teeth on the soft tooth insert 3.

In the present embodiment, the screw 4 can be replaced by a rivet; in addition, three screws can be used for fixing according to different numbers of chain teeth on the hard tooth insert 2.

In this embodiment, the convex part of the convex-concave matching structure on the combining surface of the sprocket body and the hard tooth insert can also be arranged on the hard tooth insert, and the corresponding concave part is arranged on the sprocket body.

The rest of the structure of this embodiment is the same as embodiment 1, and is not described herein again.

The present embodiment is suitable for the situation that the number of teeth on the hard tooth insert 2 is relatively large.

In the embodiment, two end parts of the inner side of the hard tooth insert 2 are positioned on the same circular arc, and the middle part of the hard tooth insert is circular arc or linear; and when the middle part is arc-shaped, the arc radius is larger than the arc radius of the two end parts. So as to increase the width of the middle part of the hard tooth insert 2, improve the bearing capacity and prolong the service life.

Embodiment 3, referring to fig. 9, 10, 11, 12, 13 and 14, the hard tooth insert 2 is fixed by one of the screws 4; another two groups of convex-concave matching structures with hemispherical outline shapes are formed between the hard tooth insert 2 and the bearing surface; the two groups of convex-concave matching structures are formed by protrusions 1c formed on the chain wheel body 1 and concave pits 2c formed on the back surface of the hard tooth insert 2 and are distributed on two sides of the screw 4.

Wherein, the front surface of the hard tooth insert 2 is provided with a boss 2b corresponding to the pit 2c, and the boss 2b is used for forming a gap between the planes of the adjacent inserts when a plurality of inserts are stacked, carburized and quenched, thereby ensuring the depth of a carburized layer.

This embodiment is suitable for situations where the number of teeth on the hard tooth insert 2 is relatively small.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A soft tooth insert is used for being arranged on a chain wheel body (1) to form a complete inserted chain wheel together with a hard tooth insert (2), has at least one chain tooth and consists of a soft tooth insert body (3 a) and a chain tooth (3 b), wherein the soft tooth insert body (3 a) is provided with a convex-concave matching part matched with an adjacent hard tooth insert, and the convex-concave matching part extends along the tooth width direction; the soft tooth insert body (3 a) is provided with a radial extension part (3 c) on only one side in the tooth width direction, and the radial extension part (3 c) is used for forming positioning in the tooth width direction of the chain with the chain wheel body (1).

2. The soft tooth insert according to claim 1, wherein the thickness (B1) of the soft tooth insert body (3 a) is larger than the width (B2) of the sprocket (3B), the soft tooth insert body (3 a) forms circular arc-shaped outer edges on both sides of the sprocket in the thickness direction, and the circular arc diameter (D1) of the outer edges is smaller than the tooth root diameter (D2) of the sprocket (3B).

3. The soft tooth insert of claim 1, wherein the male and female mating portions are of a semi-circular keyed mating arrangement.

4. The soft tooth insert according to any one of claims 1 to 3, wherein the soft tooth insert (3) has 1 to 5 teeth; the soft tooth insert (3) is made of non-metallic materials.

5. An easy-to-assemble and disassemble inserted sprocket comprises a sprocket body (1) and a plurality of sprocket inserts provided with sprockets; the sprocket insert consists of a plurality of hard tooth inserts (2) and a plurality of soft tooth inserts (3) which are arranged in a staggered manner; the hard tooth insert (2) is fixedly connected to the chain wheel body (1) through a screw or a rivet, and the hard tooth insert (2) is connected with the soft tooth insert (3) through a first convex-concave matching structure extending in the tooth width direction; the soft tooth insert (3) is characterized by being formed by the soft tooth insert as set forth in any one of claims 1-4; the radial extension part (3 c) of the soft tooth insert is abutted against one side of the chain wheel body (1).

6. The easy-to-assemble and disassemble dental insert sprocket according to claim 5, wherein the sprocket body (1) is formed with a plurality of crescent shaped countertops (1 a) for respectively arranging the hard tooth inserts (2), and the bearing surfaces of the countertops (1 a) for bearing the hard tooth inserts (2) are flush with the back surface of the sprocket body (1).

7. The ready-to-assemble and-disassemble tipped sprocket according to claim 6, wherein the hard tooth insert (2) is fixed by at least one of the screws or rivets; the inner edge and two side walls of the sinking platform (1 a) are used for forming a three-side frame-shaped embedded positioning structure; and in the scheme that the hard tooth insert (2) is fixed through one screw or rivet, a second convex-concave matching structure with a hemispherical outline shape is formed between the hard tooth insert (2) and the bearing surface.

8. The ready-to-assemble and-disassemble tipped sprocket according to claim 7, characterized in that in the solution where the hard tooth insert (2) is fixed by one screw, there is a radial position difference between the screw hole for setting the screw and the screw through hole for passing the screw, so that the radial compression of the hard tooth insert (2) is formed by the screw.

9. The easy-to-dismount and mount insert sprocket according to any one of claims 5 to 8, wherein the hard tooth insert (2) is made of alloy material, and the number of the teeth on the hard tooth insert (2) is larger than that of the teeth on the soft tooth insert (3).

10. The easy-to-assemble and disassemble inserted sprocket as claimed in any one of claims 5 to 8, wherein the diameter of the top circle of the sprocket body (1) is smaller than the diameter of the root circle of the sprocket on the sprocket insert; the edge of the sprocket body (1) positioned at the soft tooth insert (3) is inwards sunken.