CN202381480U

CN202381480U - Crankset rivet for bicycles

Info

Publication number: CN202381480U
Application number: CN2011205361370U
Authority: CN
Inventors: 于平洲
Original assignee: CHUAN-LI PRECISION INDUSTRY Co Ltd
Current assignee: CHUAN-LI PRECISION INDUSTRY Co Ltd
Priority date: 2011-12-20
Filing date: 2011-12-20
Publication date: 2012-08-15
Anticipated expiration: 2021-12-20

Abstract

The utility model discloses a crankset rivet for bicycles, comprising a metal rod body, wherein the metal rod body comprises a first section of rod body and a second section of rod body; the first section of rod body is forged and molded into a rivet head; the second section of rod body is connected and disposed on the bottom edge of the rivet head to form a rivet body, thereby forming a rivet structure whose rivet head has higher hardness than the rivet body.

Description

The bicycle crank rivet

Technical field

The utility model is suitable for being applied on the abnormity rivet or similar structure of bicycle, electric bicycle gear disk relevant for a kind of bicycle crank rivet especially.

Background technique

Bicycle is a kind of free of contamination means of transportation; Moreover environmental consciousness comes back now, the commodity that bicycle is very powerful and exceedingly arrogant especially, and bicycle is broadly divided into two kinds; Promptly be no multi-speed bicycle and multi-speed bicycle; With the multi-speed bicycle is example, and the number of teeth of the large and small fluted disc of multi-speed bicycle front derailleur differs greatly, and the high low head between this large and small fluted disc reaches three, four times more than of tooth depth sometimes.Therefore, for make chain can be really effectively by performing than small tooth plate to than large fluted disc, traditional technology is by a kind of auxiliary gear shift usefulness that structure is promoted chain that supports to arrive in.This kind mode is to utilize the structure of additional rivet; Adding up towards sentence welding or riveted way rivet than the appropriate location of the side of small tooth plate than large fluted disc extra setting; So chain can borrow this rivet head to support to arrive in the outer plate of chain in the process that performs; Make fluted disc chain in operation process to obtain and raise, reach the purpose of auxiliary cochain gear shift.

But because the ailhead of rivet is certain with the whole hardness of nail body; Rivet head often is under the bigger situation of stressed load because of chain; Cause rivet head very easily to be worn, make chain landing rivet very easily under big stressed situation, so that reduce and prop up the success rate of chain and influence gear shift usefulness.Moreover, in case when chain is easy to the landing rivet head, with more quickening to impel the wearing and tearing of rivet head to increase the weight of, very undesirable.

The model utility content

The utility model inventor is because the disappearance that standard bicycle fluted disc rivet haves much room for improvement; Phase can provide a kind of head hardness to promote, effectively prevent the bicycle crank rivet that weares and teares; Be to grind think of, design team's system with great concentration; Consumption is popular to be used to provide, and desires to grind the creation motivation of wound for the utility model.

The main purpose of the utility model is providing a kind of and is promoting hardness, effectively preventing the bicycle crank rivet that weares and teares.

For reaching above-mentioned purpose; A kind of bicycle crank rivet of the utility model; Has a metallic rod body; This metallic rod body is divided into first section body of rod and second section body of rod, and first section body of rod is the rivet head through forging molding, and second section body of rod is to be connected with the rivet body that is lower than this rivet head in rivet head root edge hardness.

Aforesaid bicycle crank rivet, first section body of rod is that cold forging is made through the forging of forging molding.

Aforesaid bicycle crank rivet adopts the lathe car to make required external form through the rivet head that forges.

Aforesaid bicycle crank rivet, the material of this metallic rod body are austenite (austenite).

For reaching above-mentioned purpose; The another kind of bicycle crank rivet of the utility model; Has a metallic rod body; This metallic rod body is divided into first section body of rod and second section body of rod, and first section body of rod is through forging molding and carries out heat treated rivet head that second section body of rod is to be connected with the rivet body that is lower than this rivet head in the rivet head root edge and through the hardness that places cooling bath to handle.

Aforesaid bicycle crank rivet, the material of this metallic rod body be martensitic alloy (martensite, martensite).

Aforesaid bicycle crank rivet, heat treatment are high frequency heat treatment or flame heating method.

Aforesaid bicycle crank rivet is provided with cooling water or freezing mixture in the cooling bath.

The utility model compared to the outstanding advantage of existing technology is:

1, make single rivet have two kinds of hardness, when making the fluted disc that is incorporated into bicycle, the rivet head of rivet is because of having high hardness, so the unlikely wearing and tearing that receive chain.

2, utilize the low rivet body of hardness to be riveting in fluted disc, make the unlikely change row of fluted disc.

Description of drawings

Fig. 1 the utility model embodiment's stereo appearance figure.

Fig. 2 the utility model embodiment's Block Diagram.

Fig. 3 the utility model second embodiment's Block Diagram.

Fig. 4 the utility model embodiment's user mode schematic representation.

[primary component symbol description]

1 rivet arrangement, 11 metallic rod bodies

111 rivet heads, 112 rivet bodies

2 forging machines, 3 cooling baths

4 heat treatments, 5 large fluted discs

6 chains

Embodiment

With specific embodiment the utility model is further described below:

Please join Fig. 1; The rivet arrangement 1 of the utility model has a metallic rod body 11, and wherein this metallic rod body 11 is divided into first section body of rod and second section body of rod; First section body of rod is that 111, the second sections bodies of rod of a rivet head are connected with in rivet head 111 root edges formation rivet body 112 through forging machine 2 forging moldings; Whereby, first section body of rod forges the shape and the density of changes itself through forging machine 2, and the hardness of rivet head 111 is promoted, and the rivet body 112 of second section body of rod is then remained stationary, so rivet arrangement 1 that hard body is slightly soft of formation.

As shown in Figure 2, second section body of rod of this metallic rod body 11 is positioned the forging head below of forging machine 2, forging machine 2 starts; First section body of rod of this metallic rod body 11 receives punching press, thus form the large size rivet head 111 of a central uplift, and second section body of rod is connected in rivet head 111 root edge centre; So form a rivet body 112, because receiving to forge to impact, first section body of rod reached outside the required form, density also changes thereupon; Therefore, the hardness of this rivet head 111 is than the height of rivet body 112.

Please join Fig. 3 again, be preferable second embodiment of the utility model, this rivet arrangement 1 is provided with a rivet head 111 and a rivet body 112; This rivet body 112 places among the

cooling bath

3, and 111 of this rivet heads heat-treat 4, and this heat treatment 4 is high frequency heat treated or flame heating method; Make rivet head 111 through impacting change shape and density afterwards again through heat treatment 4; Make the hardness second lift of rivet head 111, but do not influence the hardness of rivet body 112, to form a rivet arrangement 1 that hard body is slightly soft.

As shown in Figure 4; The rivet arrangement of the utility model combines with the large fluted disc 5 of bicycle shift structure; Soft than rivet head 111 because of the hardness of rivet body 112, when riveted, large fluted disc 5 can not be out of shape again in the perforation that is sleeved on large fluted disc 5; And the hardness of rivet head 111 promotes, also unlikely wearing and tearing rivet head 111 after rubbing with chain 6 again.

Just the above is merely the preferred embodiment of the utility model, when can not be in order to limiting the enforceable scope of the utility model, all those skilled in the art variation and the modification that obviously can do, flesh and blood from the utility model all should be regarded as not being contrary to.

Claims

1. a bicycle crank rivet has a metallic rod body, it is characterized in that:

This metallic rod body is divided into first section body of rod and second section body of rod, and first section body of rod is the rivet head through forging molding, and second section body of rod is to be connected with the rivet body that is lower than this rivet head in rivet head root edge hardness.

2. bicycle crank rivet as claimed in claim 1 is characterized in that, first section body of rod is that cold forging is made through the forging of forging molding.

3. bicycle crank rivet as claimed in claim 1 is characterized in that, adopts the lathe car to make required external form through the rivet head that forges.

4. bicycle crank rivet as claimed in claim 1 is characterized in that, the material of this metallic rod body is an austenite.

5. a bicycle crank rivet has a metallic rod body, it is characterized in that:

This metallic rod body is divided into first section body of rod and second section body of rod, and first section body of rod is through forging molding and carries out heat treated rivet head that second section body of rod is to be connected with the rivet body that is lower than this rivet head in the rivet head root edge and through the hardness that places cooling bath to handle.

6. bicycle crank rivet as claimed in claim 5 is characterized in that, first section body of rod is that cold forging is made through the forging of forging molding.

7. bicycle crank rivet as claimed in claim 5 is characterized in that, adopts the lathe car to make required external form through the rivet head that forges.

8. bicycle crank rivet as claimed in claim 5 is characterized in that, the material of this metallic rod body is a martensitic alloy.

9. bicycle crank rivet as claimed in claim 5 is characterized in that, heat treatment is high frequency heat treatment or flame heating method.

10. bicycle crank rivet as claimed in claim 5 is characterized in that, is provided with cooling water or freezing mixture in the cooling bath.