CN214356508U

CN214356508U - Novel plastic-coated crank wheel disc

Info

Publication number: CN214356508U
Application number: CN202022584749.9U
Authority: CN
Inventors: 陈强
Original assignee: Hongrui Tiancheng Technology Tianjin Co ltd
Current assignee: Hongrui Tiancheng Technology Tianjin Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-10-08
Anticipated expiration: 2030-11-10

Abstract

The utility model relates to a novel crank wheel dish is moulded to package, mould crank, fluted disc, chain lid including the package, the package is moulded the crank and is included upper cover, crank main part and lower cover, the back of upper cover is equipped with the upper groove, the upper surface of crank main part is inserted in the upper groove and is laminated rather than the inner wall, the back edge part of upper cover sets up the ultrasonic bonding line. The utility model discloses moulding the package crank design for split type structure, moulding by original integrative package, changing into upper cover, crank main part and lower cover triplex equipment and constituting, just can the independent production upper cover and lower cover under the prerequisite that does not need the crank main part, only need follow-up carry on the assembly line equipment can, like this than original integrative package mould articulate work efficiency and improve by a wide margin.

Description

Novel plastic-coated crank wheel disc

Technical Field

The utility model relates to a bicycle accessory technical field, concretely relates to novel crank wheel dish is moulded to package.

Background

At present, there are three types of cranks, namely aluminum alloy cranks, iron cranks and plastic-coated cranks. Wherein the usage amount of the plastic coated crank is the maximum. His advantages lie in: the price is low; the surface of the plastic bag is wrapped by plastic cement and can not rust after long-time use. And current integrative package is moulded will be earlier put the crank in the mould, injection moulding, and package plastic bag arrives articulate surface, at first need produce the crank at first and then place the crank in the mould and carry out injection moulding, and crank and package plastic can not produce simultaneously to need the manual work to place the crank in the mould, degree of automation is low, causes production efficiency low, and the manual work places the crank, and it is not accurate to produce easily to place the position, leads to the defective rate high.

SUMMERY OF THE UTILITY MODEL

For solving the problem that prior art exists, the utility model provides a novel package is moulded crank wheel dish.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a novel crank rim plate is moulded to package, moulds the crank including the package, the package is moulded the crank and is included upper cover, crank main part and lower cover, the back of upper cover is equipped with the upper groove, the upper surface of crank main part is inserted in the upper groove and is laminated rather than the inner wall, the back border part of upper cover sets up the ultrasonic bonding line, the front of lower cover is equipped with the low groove, the lower extreme of crank main part is inserted in the low groove and is laminated rather than the inner wall, the first step is fixed at big-end back of lower cover, upper cover and lower cover are with crank main part parcel in it, the crank is moulded to the fixed formation package of ultrasonic bonding line in the edge of upper cover and lower cover, the articulate big-end is moulded to the package is fixed with the fluted disc riveting, and compresses tightly the chain cover between crank and the fluted disc is moulded to the package.

Preferably, the front of the big head end of the crank main body is provided with a middle shaft screw mounting hole, the back of the big head end of the crank main body is provided with a square hole communicated with the middle shaft screw mounting hole, the small head end of the crank main body is provided with a pedal mounting hole, and the pedal mounting hole penetrates through the small head ends of the upper cover and the lower cover.

In any of the above schemes, preferably, the middle shaft screw mounting hole penetrates through the large head end of the upper cover, and the large head end of the lower cover is provided with a through hole penetrating through the first step, so that the large head end of the crank main body is inserted into the through hole.

In any of the above schemes, preferably, a second step is fixed on the back of the big end of the crank body, the top end of the outer wall of the second step is annularly arrayed with a plurality of teeth, and the square hole penetrates through the second step.

In any of the above schemes, preferably, the front of the chain cover is provided with a round hole and a groove, the bottom of the inner wall of the round hole is fixed with an annular step, the first step is inserted into the round hole and acts with the annular step to form interference fit, so that the chain cover is pressed in the middle when the fluted disc and the plastic-coated crank are riveted, and the groove is matched with the lower surface of the lower cover close to the first step.

In any of the above embodiments, preferably, a reinforcing rib is fixed to a rear surface of the chain cover, and a rear surface of the reinforcing rib is attached to a front surface of the toothed disc.

In any of the above embodiments, preferably, the central hole of the toothed disc is of a toothed structure to cooperate with the teeth on the second step.

In any of the above schemes, preferably, the bottom end of the second step passes through the central hole of the fluted disc and extends to the outside, so that the fluted disc and the plastic-covered crank can be riveted and fixed.

Compared with the prior art, the utility model provides a pair of novel package is moulded crank wheel dish has following beneficial effect:

1. the plastic-coated crank is designed into a split structure, is formed by assembling an original integral plastic coating into an upper cover, a crank main body and a lower cover, can produce the upper cover and the lower cover independently on the premise of not needing the crank main body, can realize full-automatic production of the upper cover and the lower cover without putting the crank main body into a die, does not need human intervention, and only needs subsequent assembly line assembly, thereby improving the working efficiency compared with the original integral plastic-coated crank, reducing the steps of manual intervention, improving the precision of products and reducing the reject ratio;

2. set up the round hole on the chain lid, round hole internal fixation annular step when package is moulded crank and fluted disc riveting, make first step insert in the round hole and form interference fit with annular step interact, make the chain cover pressed between package is moulded crank and fluted disc, play the fixed action, avoid follow-up process of fixing the chain lid on the fluted disc with the screw, the while is also avoided beating the harmfulness that appears in the time of the screw, such structural mounting firmness is also far better than the screw fixation.

Drawings

Fig. 1 is a schematic view of a split structure of a novel plastic-coated crank wheel disc provided by the utility model;

FIG. 2 is a schematic view of the disassembled structure at another angle in FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a partial enlarged view of the portion B in FIG. 4;

fig. 6 is a bottom view of fig. 3.

The figures are labeled as follows: 1. an upper cover; 2. a crank body; 3. a lower cover; 4. a second step; 5. a first step; 6. a chain cover; 7. a fluted disc; 8. a circular hole; 9. a groove; 10. teeth; 11. a middle shaft screw mounting hole; 12. a pedal mounting hole; 13. perforating; 14. an annular step; 15. and (4) square holes.

Detailed Description

In order to further understand the inventive content of the present invention, the present invention will be explained in detail with reference to the specific embodiments.

As shown in fig. 1-6, an embodiment of a novel plastic-coated crank wheel disc provided by the present invention comprises a plastic-coated crank, the plastic-coated crank comprises an upper cover 1, a crank main body 2 and a lower cover 3, an upper groove 9 is arranged on the back surface of the upper cover 1, the upper surface of the crank main body 2 is inserted into the upper groove 9 and is attached to the inner wall of the upper groove, the edge part of the back surface of the upper cover 1 is provided with an ultrasonic welding line, the front surface of the lower cover 3 is provided with a lower groove 9, the lower end of the crank body 2 is inserted in the lower groove 9 and is jointed with the inner wall thereof, the back of the big end of the lower cover 3 is fixed with a first step 5, the crank main body 2 is wrapped by the upper cover 1 and the lower cover 3, the edge of upper cover 1 and lower cover 3 is fixed through ultrasonic bonding wire and is formed the package and mould the crank, the package is moulded articulate big-end and fluted disc 7 riveting and is fixed, and compresses tightly chain cover 6 between package and mould crank and fluted disc 7. The upper cover 1 and the lower cover 3 are both formed by injection molding of plastic materials.

The crank design is moulded to the package is split type structure, mould by original integrative package, change into upper cover 1, crank main part 2 and 3 triplexs of lower cover and constitute, during the equipment, place crank main part 2 in lower groove 9 of lower cover 3, cover upper cover 1 and weld upper cover 1 and lower cover 3 through ultrasonic bonding wire and fuse together, just can produce upper cover 1 and lower cover 3 under the prerequisite that does not need crank main part 2, owing to need not put crank main part 2 in the mould and just can realize the full automatic production of upper cover 1 and lower cover 3, do not need the people to intervene, only need follow-up carry out the assembly line equipment can, mould crank work efficiency and improve by a wide margin than original integrative package like this.

The front side of the big head end of the crank main body 2 is provided with a middle shaft screw mounting hole 11, the back side of the big head end of the crank main body 2 is provided with a square hole 15 communicated with the middle shaft screw mounting hole 11, the small head end of the crank main body 2 is provided with a pedal mounting hole 12, and the pedal mounting hole 12 penetrates through the small head ends of the upper cover 1 and the lower cover 3. The square hole 15 is used for mounting a centre shaft, the centre shaft screw mounting hole 11 is used for mounting a centre shaft screw, and the pedal mounting hole 12 is used for mounting a pedal

The middle shaft screw mounting hole 11 penetrates through the large end of the upper cover 1, and the large end of the lower cover 3 is provided with a through hole 13 penetrating through the first step 5, so that the large end of the crank main body 2 is inserted into the through hole 13.

The back of the big end of the crank body 2 is fixed with a second step 4, the top end of the outer wall of the second step 4 is annularly arrayed with a plurality of teeth 10, and the square hole 15 penetrates through the second step 4. The central hole of the fluted disc 7 is of a toothed structure to cooperate with the teeth 10 on the second step 4.

The front surface of the chain cover 6 is provided with a round hole 8 and a groove 9, the bottom of the inner wall of the round hole 8 is fixedly provided with an annular step 14, the first step 5 is inserted into the round hole 8 and acts with the annular step 14 to form interference fit, so that the chain cover 6 is pressed in the middle when the fluted disc 7 and the plastic-coated crank are riveted, the fixing effect is achieved, the subsequent process of fixing the chain cover on the fluted disc 7 by screws is avoided, the defects in screwing are avoided, and the structural installation firmness is far better than that of screw fixation; the groove 9 cooperates with the lower surface of the lower cover 3 close to the first step 5.

The reinforcing rib is fixed on the back of the chain cover 6, the back of the reinforcing rib is attached to the front of the fluted disc 7, and the strength of the chain cover 6 is improved due to the arrangement of the reinforcing rib.

The bottom end of the second step 4 penetrates through the middle hole of the fluted disc 7 and extends to the outer side, so that the fluted disc 7 and the plastic-coated crank can be riveted and fixed, after the plastic-coated crank, the chain cover 6 and the fluted disc 7 are assembled, the bottom end of the second step 4 is flattened to play a role in pressing the fluted disc 7, and the plastic-coated crank, the chain cover 6 and the fluted disc 7 are fixed into a whole.

During the equipment, place crank main part 2 in lower groove 9 of lower cover 3, then buckle upper cover 1, the edge of upper cover 1 and lower cover 3 passes through ultrasonic bonding line welded fastening, form the package and mould the crank, then mould articulate big head end with the package and insert in chain cover 6, second step 4 on the lower cover 3 inserts and forms interference fit with annular step 14 interact in round hole 8 promptly, the bottom of second step 4 extends to the outside of fluted disc 7, flatten the bottom of second step 4, make fluted disc 7 and package mould the crank riveting fixed, thereby make chain cover 6 pressed between fluted disc 7 and package and mould the crank, it is fixed to accomplish holistic equipment.

It will be understood by those skilled in the art that any combination of the elements of the present invention, including the summary and detailed description of the invention provided in the foregoing description and illustrated in the accompanying drawings, is not to be considered limiting in scope and in order to make the description more concise, and not to describe every element of the combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a novel package is moulded crank wheel dish, moulds crank, fluted disc, chain lid including the package, its characterized in that: the package is moulded the crank and is included upper cover, crank main part and lower cover, the back of upper cover is equipped with the upper groove, the upper surface of crank main part is inserted in the upper groove and is laminated rather than the inner wall, the back border part of upper cover sets up ultrasonic bonding line, the front of lower cover is equipped with the low groove, the lower extreme of crank main part is inserted in the low groove and is laminated rather than the inner wall, the first step is fixed at the stub end back of lower cover, upper cover and lower cover are wrapped up crank main part in it, the crank is moulded to the fixed formation package of ultrasonic bonding line in upper cover and lower cover's edge, the big-end of the crank is moulded to the package is fixed with the fluted disc riveting, and compresses tightly the chain cover between package is moulded crank and fluted disc.

2. The novel plastic-coated crank wheel disc as claimed in claim 1, characterized in that: the front of the big head end of the crank main body is provided with a middle shaft screw mounting hole, the back of the big head end of the crank main body is provided with a square hole communicated with the middle shaft screw mounting hole, the small head end of the crank main body is provided with a pedal mounting hole, and the pedal mounting hole penetrates through the small head ends of the upper cover and the lower cover.

3. The novel plastic-coated crank wheel disc as claimed in claim 2, characterized in that: the middle shaft screw mounting hole penetrates through the large head end of the upper cover, and the large head end of the lower cover is provided with a through hole penetrating through the first step, so that the large head end of the crank main body is inserted into the through hole.

4. The novel plastic-coated crank wheel disc as claimed in claim 2, characterized in that: the back of the big end of the crank main body is fixed with a second step, the top end of the outer wall of the second step is provided with a plurality of teeth in an annular array, and the square hole penetrates through the second step.

5. The novel plastic-coated crank wheel disc as claimed in claim 1, characterized in that: the front of the chain cover is provided with a round hole and a groove, the bottom of the inner wall of the round hole is fixedly provided with an annular step, the first step is inserted into the round hole and acts with the annular step to form interference fit, so that the chain cover is pressed in the middle when the fluted disc and the plastic-coated crank are riveted, and the groove is matched with the lower surface of the lower cover close to the first step.

6. The novel plastic-coated crank wheel disc as claimed in claim 1, characterized in that: the reinforcing rib is fixed on the back of the chain cover, and the back of the reinforcing rib is attached to the front face of the fluted disc.

7. The novel plastic-coated crank wheel disc as claimed in claim 4, characterized in that: the middle hole of the fluted disc is of a toothed structure and is matched with the teeth on the second step.

8. The novel plastic-coated crank wheel disc as claimed in claim 4, characterized in that: and the bottom end of the second step penetrates through the middle hole of the fluted disc and extends to the outer side, so that the fluted disc and the plastic-coated crank can be riveted and fixed.