CN215922458U - Electric bicycle center shaft square sleeve assembly and square sleeve cold heading forming die - Google Patents
Electric bicycle center shaft square sleeve assembly and square sleeve cold heading forming die Download PDFInfo
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- CN215922458U CN215922458U CN202122710993.XU CN202122710993U CN215922458U CN 215922458 U CN215922458 U CN 215922458U CN 202122710993 U CN202122710993 U CN 202122710993U CN 215922458 U CN215922458 U CN 215922458U
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Abstract
A square sleeve component of a middle shaft of an electric bicycle and a square sleeve cold heading forming die are disclosed, wherein the square sleeve component of the middle shaft of the electric bicycle comprises a middle shaft, a chain wheel and a square sleeve, the square sleeve is sleeved on the middle shaft through a central hole, a circumferential fixing structure and an axial fixing structure are arranged between the square sleeve and the middle shaft, the circumferential fixing structure is a positioning groove arranged on the inner wall of the central hole of the square sleeve or the central hole of the square sleeve is designed into a multi-prism hole, and a positioning boss is arranged at the corresponding part of the middle shaft or the corresponding part is designed into a multi-prism structure; one end of the square sleeve is provided with a fixed seat, and the square sleeve and the chain wheel are fixedly assembled through the fixed seat. The square sleeve component of the middle shaft of the electric bicycle can be manufactured by adopting a cold heading forming process, and the purposes of improving the working efficiency, reducing the production cost and prolonging the service life of the middle shaft are achieved.
Description
Technical Field
The utility model relates to a metal material part and cold-heading forming die, especially an electric bicycle axis square sleeve subassembly and square sleeve cold-heading forming die.
Background
In a manual driving system of an electric bicycle, a middle shaft and a chain wheel are key parts of power transmission, and manual force is applied to pedals and transmitted to a driving wheel through the middle shaft, the chain and a flywheel, so that a bicycle body moves forwards. The chain wheel of the electric bicycle comprises a chain wheel body and a square sleeve, and the chain wheel body is fixedly arranged on a middle shaft through the square sleeve. In the prior art, a square sleeve of an electric bicycle is formed by adopting a hot pressing process, namely, after a blank of the square sleeve is formed, an inner hole assembled with a middle shaft is processed by machine tool equipment. The hot-press molding process not only has complex operation steps, but also causes environmental pollution and energy waste; in addition, the chain wheel body and the square sleeve need to be assembled together in a welding mode, welding stress can be generated in the welding process, the problem of desoldering after use is easily caused, the slipping phenomenon between the middle shaft and the chain wheel is caused, and the normal work of the electric bicycle is influenced.
As shown in the attached drawings 1 and 2, aiming at the problems, a split chain wheel of the electric bicycle formed by a cold heading process is produced, so that the problems that the operation steps of the hot pressing process are complicated and the welding mode of the square sleeve 2 and the chain wheel 3 is easy to be detached are solved, but in the technical scheme, the square sleeve 2 and the middle shaft 1 limit the relative movement between the square sleeve and the middle shaft through the pin component 4, so that the positioning pin holes which are transversely communicated are required to be simultaneously processed on the square sleeve and the middle shaft, the workload of processing and assembling operation is increased, the production cost is increased, the strength of the middle shaft is reduced, and the service life of the middle shaft is shortened.
Disclosure of Invention
The utility model provides a square sleeve component of a middle shaft of an electric bicycle, aiming at limiting the relative movement between the middle shaft and a square sleeve in the running process of the electric bicycle by arranging a circumferential fixing structure and an axial fixing structure between the middle shaft and the square sleeve, and achieving the purposes of improving the working efficiency, reducing the production cost and prolonging the service life of the middle shaft.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a kind of electric bicycle middle shaft square sleeve assembly, including middle shaft, chain wheel and square sleeve, the said square sleeve is fitted on the middle shaft through the centre hole, set up fixed structure and axial fixed structure circumferentially between square sleeve and middle shaft, the said fixed structure circumferentially for set up in inner wall of centre hole or design the center hole of square sleeve as the multi-prism hole, and set up the locating boss or design the corresponding position as the multi-prism structure in the corresponding position of the said middle shaft; one end of the square sleeve is provided with a fixed seat, and the square sleeve and the chain wheel are fixedly assembled through the fixed seat.
In the square sleeve component for the middle shaft of the electric bicycle, the circumferential fixing structure is a spline groove-shaped positioning groove arranged on the inner wall of the central hole of the square sleeve, and a spline-shaped positioning boss is arranged at the corresponding part of the middle shaft.
In the square sleeve component for the middle shaft of the electric bicycle, the circumferential fixing structure is a flat key groove type positioning groove arranged on the inner wall of the central hole of the square sleeve, and a flat key type positioning boss is arranged at the corresponding part of the middle shaft.
In the electric bicycle center shaft square sleeve assembly, the circumferential fixing structure is that the center hole of the square sleeve is designed into a polygonal prism hole, and the corresponding part of the center shaft is designed into a polygonal prism structure.
The axial fixing structure of the electric bicycle middle shaft square sleeve component adopts a retainer ring fixing mode and comprises an annular limiting step arranged on the middle shaft, an annular clamping groove formed in the middle shaft and a retainer ring installed in the clamping groove, wherein the annular limiting step is located on one side of the square sleeve, and the annular clamping groove is located on the other side of the square sleeve.
The axial fixing structure of the electric bicycle middle shaft square sleeve component adopts a nut locking mode and comprises an annular limiting step arranged on the middle shaft, an external thread and a locking nut assembled with the external thread, wherein the annular limiting step is positioned on one side of the square sleeve, and the external thread and the locking nut are positioned on the other side of the square sleeve.
The axial fixing structure of the electric bicycle middle shaft square sleeve component adopts a jackscrew fixing mode and comprises an annular positioning groove and a jackscrew which are arranged on the middle shaft, the jackscrew is assembled with a threaded hole arranged on the side wall of the square sleeve, and the inner side end of the jackscrew is inserted into the annular positioning groove of the middle shaft.
In the square sleeve component for the middle shaft of the electric bicycle, the outer wall of the fixed seat of the square sleeve is provided with an anti-rotation structure matched with the chain wheel; the anti-rotation structure is a convex structure arranged on the outer wall of the fixed seat or the connecting seat is designed into a polygonal column boss, and a groove structure is arranged on the inner wall of a central hole of the chain wheel or the central hole of the chain wheel body is designed into a polygonal hole structure; the outer wall protruding structure of the fixing seat is provided with an axial die drawing conical surface of 0.8-1.5 degrees.
According to the square sleeve assembly of the middle shaft of the electric bicycle, the square sleeve and the middle shaft are prevented from rotating relatively in the running process of the electric bicycle through the circumferential fixing structure; the axial movement of the square sleeve and the toothed disc fixed on the square sleeve in the running process of the electric bicycle is avoided through the axial fixing structure; the utility model can also realize the positioning function between the square sleeve and the chain wheel through the anti-rotation structure. The utility model does not need to process the positioning pin holes which are transversely communicated on the square sleeve and the middle shaft at the same time, thereby not only reducing the workload of processing and assembling operation and reducing the production cost, but also improving the strength of the middle shaft and prolonging the service life of the middle shaft.
The utility model also provides a cold heading forming die for the square sleeve of the electric bicycle, which adopts the following technical scheme:
a square sleeve cold heading forming die for an electric bicycle comprises a die holder, a die plate, a lower die and a punch; the die holder is fixedly arranged on a movable workbench of the cold heading equipment; the template is embedded in the die holder, and a lower die is assembled in the middle of the template; the lower die is provided with a die cavity matched with the outer wall of the square sleeve; the punch is installed at the power output end of the cold heading equipment, and a plurality of groups are sequentially arranged along the moving direction of the moving workbench of the cold heading equipment.
According to the electric bicycle square sleeve cold heading forming die, the forming groove matched with the anti-rotation structure on the square sleeve is formed in the bottom of the inner wall of the die cavity; the number of the punches is three, namely a first punch, a second punch and a third punch; the first punch is used for completing cold heading forming of the square sleeve anti-rotation structure, the second punch is used for completing cold heading preforming of a square sleeve central hole, the first punch and the second punch are both cylindrical punches, the diameter size of the first punch is d1, the diameter size of the second punch is d2, and d2 is larger than or equal to d 1; the third punch is used for finishing the final cold heading forming of the square sleeve, and the third punch is matched with the inner hole structure of the square sleeve and is a cylindrical punch or a polygonal-prism punch with a boss structure on the outer wall.
The electric bicycle square sleeve cold heading forming die is matched with an electric bicycle square sleeve cold heading forming process, so that the batch production of the electric bicycle middle shaft square sleeve assembly is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a conventional electric bicycle manual driving system;
FIG. 2 is an enlarged view of the structure at I in FIG. 1;
FIG. 3 is a schematic view of an assembly structure of a square sleeve, a chain wheel and a middle shaft when an axial fixing structure adopts a retainer ring fixing mode;
FIG. 4 is a schematic view of the cross-sectional structure A-A (when the square sleeve has a quadrangular structure) in FIG. 3;
FIG. 5 is a schematic view of the cross-sectional structure B-B (when the square sleeve has a quadrangular structure) in FIG. 3;
FIG. 6 is a schematic view of the cross-sectional structure B-B of FIG. 3 (when the square jacket is a hexagonal structure);
FIG. 7 is a schematic view of a structure of the sleeve when the axial fixing structure adopts a retainer ring fixing mode;
FIG. 8 is a schematic view (partial) of the structure of the middle shaft when the axial fixing structure adopts a retaining ring fixing mode;
FIG. 9 is a schematic view of an assembly structure of the square sleeve and the middle shaft when the axial fixing structure adopts a jackscrew fixing mode;
FIG. 10 is a schematic view of a square sleeve structure when the axial fixing structure adopts a jackscrew fixing mode;
FIG. 11 is a schematic view (partial) of a middle shaft structure when the axial fixing structure adopts a jackscrew fixing mode;
FIG. 12 is a schematic structural view of a square sleeve cold heading forming die of the electric bicycle;
FIG. 13 is a top view (partial) of FIG. 12;
fig. 14 is a schematic view of the cross-sectional structure C-C of fig. 12.
The list of labels in the figure is:
1. the middle shaft, 1-1, a positioning boss, 1-2, an annular limiting step, 1-3, an annular clamping groove, 1-4 and an annular positioning groove;
2. 2-1 parts of square sleeve, 2-2 parts of positioning groove, 2-2 parts of fixing seat, 2-3 parts of threaded hole;
3. a chain wheel;
4. a pin assembly;
5. a retainer ring;
6. carrying out top thread;
7. 7-1 parts of a cold heading forming die, 7-1 parts of a lower die, 7-1 parts of a die cavity, 7-1 parts of-2 parts of a convex structure forming groove, 7-2 parts of a template, 7-3 parts of a die holder, 7-4 parts of a punch, 7-4 parts of 1 part of a first punch, 7-4 parts of a second punch, 7-4 parts of a third punch.
Detailed Description
The utility model is further described with reference to the following figures and specific embodiments.
Referring to fig. 3, 4, 5 and 6, the square sleeve assembly for the middle shaft of the electric bicycle comprises a middle shaft 1, a chain wheel 3 and a square sleeve 2, wherein the square sleeve 2 is sleeved on the middle shaft 1 through a central hole; a circumferential fixing structure and an axial fixing structure are arranged between the square sleeve 2 and the middle shaft 1, the circumferential fixing structure is a positioning groove 2-1 arranged on the inner wall of a central hole of the square sleeve 2 or the central hole of the square sleeve is designed into a multi-prism hole, and a positioning boss 1-1 is arranged at the corresponding part of the middle shaft or the corresponding part is designed into a multi-prism structure; one end of the square sleeve 2 is provided with a fixed seat 2-2, the square sleeve 2 and the chain wheel 3 are fixedly assembled through the fixed seat 2-2, and the outer wall of the fixed seat 2-2 is provided with an anti-rotation structure matched with the chain wheel 3; the anti-rotation structure is a convex structure arranged on the outer wall of the fixed seat 2-2 or the connecting seat is designed into a polygonal column boss, and a groove structure is arranged on the inner wall of a central hole of the chain wheel 3 or the central hole of the chain wheel body is designed into a polygonal hole structure; the outer wall of the fixed seat 2-2 is provided with a protruding structure with an axial drawing conical surface of 0.8-1.5 degrees.
Referring to fig. 3, 5, 6, 7 and 8, in the square sleeve assembly for the bottom bracket of the electric bicycle, the cross section of the outer wall of the square sleeve 2 is in a square structure (as shown in fig. 5) or a regular hexagon structure (as shown in fig. 6).
Referring to fig. 3, 5, 7 and 8, the preferred embodiment of the circumferential fixing structure of the square sleeve component of the bottom bracket of the electric bicycle in the utility model is a spline groove-shaped positioning groove 2-1 arranged on the inner wall of the central hole of the square sleeve, which is matched with the spline groove-shaped positioning groove, and a spline positioning boss 1-1 is arranged on the corresponding part of the bottom bracket 1.
The circumferential fixing structure of the electric bicycle middle shaft square sleeve component can also be a flat key groove type positioning groove arranged on the inner wall of a central hole of the square sleeve, the flat key groove type positioning groove is matched with the flat key groove type positioning groove, and a flat key type positioning lug boss is arranged on the corresponding part of the middle shaft 1.
Referring to fig. 6, the circumferential fixing structure of the electric bicycle bottom bracket square sleeve assembly of the present invention may also be a polygonal prism structure designed to match the center hole of the square sleeve and to design the corresponding part of the bottom bracket 1.
Referring to fig. 3 and 8, the first embodiment of the axial fixing structure of the electric bicycle bottom bracket square sleeve assembly of the present invention is: the middle shaft 1 is provided with an annular limiting step 1-2 and an annular clamping groove 1-3, after the square sleeve 2 is assembled with the middle shaft 1, one end of the square sleeve is axially positioned by the annular limiting step 1-2, and the other end of the square sleeve is axially positioned by a retaining ring 5 arranged in the annular clamping groove.
Referring to fig. 9, 10 and 11, a second embodiment of the axial fixing structure of the electric bicycle bottom bracket square sleeve assembly of the present invention is: the side wall of the square sleeve 2 is provided with an axial positioning hole which is a threaded hole 2-3, and the axial positioning function of the square sleeve is realized through a jackscrew 6 arranged in the threaded hole 2-3.
Referring to fig. 12 and 13, the electric bicycle square sleeve cold heading forming die 7 comprises a die holder 7-3, a die plate 7-2, a lower die 7-1 and a punch 7-4; the die holder 7-3 is fixedly arranged on a movable workbench of the cold heading equipment; the template 7-2 is embedded in the die holder 7-3, and a lower die 7-1 is assembled in the middle of the template 7-2; the lower die 7-1 is provided with a die cavity 7-1-1 matched with the outer wall of the square sleeve 2; a convex structure forming groove 7-1-2 matched with the anti-rotation structure on the square sleeve 2 is formed in the bottom of the inner wall of the die cavity 7-1-1; the punch heads 7-4 are arranged at a power output end of the cold heading equipment, and are three groups which are sequentially arranged along the moving direction of a moving workbench of the cold heading equipment, namely a first punch head 7-4-1, a second punch head 7-4-2 and a third punch head 7-4-3.
Referring to fig. 12 and 14, in the cold-heading forming die 7 for the electric bicycle bottom bracket square sleeve assembly, the first punch 7-4-1 is used for completing the cold-heading forming of the anti-rotation structure of the square sleeve 2, the second punch 7-4-2 is used for completing the cold-heading preforming of the central hole of the square sleeve 2, and the third punch 7-4-3 is used for completing the final cold-heading forming of the square sleeve 2; the first punch head 7-4-1 and the second punch head 7-4-2 are both cylindrical punch heads, wherein the diameter of the first punch head 7-4-1 is d1, the diameter of the second punch head 7-4-2 is d2, and d2 is not less than d 1; the third punch 7-4-3 is matched with the circumferential fixing structure 2-1 of the square sleeve 2 and is a cylindrical punch or a polygonal column punch with a boss structure on the outer wall.
Referring to fig. 1 to 11, the square sleeve assembly for the bottom bracket shaft of the electric bicycle according to the present invention prevents the relative rotation between the square sleeve 2 and the bottom bracket shaft 1 during the operation of the electric bicycle by the circumferential fixing structure; meanwhile, the axial movement of the square sleeve 2 and the chain wheel 3 fixedly assembled with the square sleeve 2 in the running process of the electric bicycle is avoided through an axial fixing structure; the utility model can also realize the positioning function between the square sleeve 2 and the chain wheel 3 through the anti-rotation structure 2-2 of the square sleeve 2. As the utility model does not need to process the positioning pin holes which are transversely communicated on the square sleeve 2 and the middle shaft 1 at the same time as shown in figures 1 and 2, the workload of processing and assembling operation is reduced, the production cost is reduced, the strength of the middle shaft is improved, and the service life of the middle shaft 1 is prolonged.
Referring to fig. 12, 13 and 14, the cold-heading forming die 7 of the electric bicycle center shaft square sleeve assembly is matched with a cold-heading forming process of the electric bicycle center shaft square sleeve assembly, and can sequentially complete cold-heading forming of the anti-rotation structure 2-2 of the square sleeve 2, central hole cold-heading preforming and final cold-heading forming of the square sleeve 2 through three cold-heading forming operation processes, so that batch production of the electric bicycle center shaft square sleeve assembly is realized.
Claims (10)
1. A middle shaft square sleeve assembly of an electric bicycle comprises a middle shaft (1), a chain wheel (3) and a square sleeve (2), wherein the square sleeve (2) is sleeved on the middle shaft (1) through a central hole; the method is characterized in that: a circumferential fixing structure and an axial fixing structure are arranged between the square sleeve (2) and the middle shaft (1), the circumferential fixing structure is a positioning groove (2-1) arranged on the inner wall of a central hole of the square sleeve (2) or the central hole of the square sleeve is designed into a multi-prism hole, and a positioning boss (1-1) is arranged at the corresponding part of the middle shaft or the corresponding part is designed into a multi-prism structure; one end of the square sleeve (2) is provided with a fixed seat (2-2), and the square sleeve (2) and the chain wheel (3) are fixedly assembled through the fixed seat (2-2).
2. The electric bicycle bottom bracket square sleeve assembly of claim 1, wherein: the circumferential fixing structure is a spline groove-shaped positioning groove arranged on the inner wall of a central hole of the square sleeve (2), and a spline-shaped positioning boss is arranged at the corresponding part of the middle shaft (1).
3. The electric bicycle bottom bracket square sleeve assembly of claim 1, wherein: the circumferential fixing structure is a flat key groove type positioning groove arranged on the inner wall of the central hole of the square sleeve (2), and a flat key type positioning boss is arranged at the corresponding part of the middle shaft (1).
4. The electric bicycle bottom bracket square sleeve assembly of claim 1, wherein: the circumferential fixing structure is characterized in that the central hole of the square sleeve (2) is designed into a polygonal prism hole, and the corresponding part of the middle shaft (1) is designed into a polygonal prism structure.
5. The electric bicycle bottom bracket square sleeve assembly according to claim 2, 3 or 4, wherein: the axial fixing structure adopts a check ring fixing mode and comprises an annular limiting step (1-2) arranged on the middle shaft (1), an annular clamping groove (1-3) formed in the middle shaft and a check ring (5) arranged in the annular clamping groove (1-3), wherein the annular limiting step (1-2) is positioned on one side of the square sleeve (2), and the annular clamping groove (1-3) is positioned on the other side of the square sleeve (2).
6. The electric bicycle bottom bracket square sleeve assembly according to claim 2, 3 or 4, wherein: the axial fixing structure adopts a nut locking mode and comprises an annular limiting step (1-2) arranged on the middle shaft (1), an external thread and a locking nut assembled with the external thread, wherein the annular limiting step (1-2) is positioned on one side of the square sleeve (2), and the external thread and the locking nut are positioned on the other side of the square sleeve (2).
7. The electric bicycle bottom bracket square sleeve assembly according to claim 2, 3 or 4, wherein: the axial fixing structure adopts a jackscrew fixing mode and comprises annular positioning grooves (1-4) and jackscrews (6) which are formed in the middle shaft (1), the jackscrews (6) are assembled with threaded holes (2-3) formed in the side wall of the square sleeve (2), and the inner side ends of the jackscrews (6) are inserted into the annular positioning grooves (1-4) of the middle shaft (1).
8. The electric bicycle bottom bracket square sleeve assembly according to claim 2, 3 or 4, wherein: an anti-rotation structure matched with the chain wheel is arranged on the outer wall of the fixed seat (2-2) of the square sleeve (2); the anti-rotation structure is a convex structure arranged on the outer wall of the fixed seat (2-2) or the connecting seat is designed into a polygonal boss, and a groove structure is arranged on the inner wall of a central hole of the chain wheel (3) or the central hole of the chain wheel body is designed into a polygonal hole structure; the outer wall protruding structure of the fixed seat (2-2) is provided with an axial drawing conical surface of 0.8-1.5 degrees.
9. The utility model provides an electric bicycle side's cover cold-heading forming die, is applicable to the cold-heading shaping processing of above-mentioned electric bicycle axis side's cover (2) in the subassembly, its characterized in that: the cold heading forming die (7) comprises a die holder (7-3), a template (7-2), a lower die (7-1) and a punch (7-4); the die holder (7-3) is fixedly arranged on a movable workbench of the cold heading equipment; the template (7-2) is embedded in the die holder (7-3), and the lower die (7-1) is assembled in the middle of the template (7-2); the lower die (7-1) is provided with a die cavity (7-1-1) matched with the outer wall of the square sleeve (2); the punch heads (7-4) are arranged at the power output end of the cold heading equipment and are sequentially arranged in a plurality of groups along the moving direction of the moving workbench of the cold heading equipment.
10. The electric bicycle square sleeve cold heading forming die as claimed in claim 9, wherein: a convex structure forming groove (7-1-2) matched with the anti-rotation structure on the square sleeve is arranged at the bottom of the inner wall of the die cavity (7-1-1); the number of the punch heads (7-4) is three, namely a first punch head (7-4-1), a second punch head (7-4-2) and a third punch head (7-4-3); the first punch (7-4-1) is used for completing cold heading forming of a square sleeve anti-rotation structure, the second punch (7-4-2) is used for completing cold heading preforming of a square sleeve central hole, the first punch (7-4-1) and the second punch (7-4-2) are both cylindrical punches, the diameter size of the first punch (7-4-1) is d1, the diameter size of the second punch (7-4-2) is d2, and d2 is larger than or equal to d 1; the third punch (7-4-3) is used for finishing the final cold heading forming of the square sleeve (2), and the third punch (7-4-3) is matched with the inner hole structure of the square sleeve (2) and is a cylindrical punch or a polygonal punch with a boss structure on the outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122710993.XU CN215922458U (en) | 2021-11-08 | 2021-11-08 | Electric bicycle center shaft square sleeve assembly and square sleeve cold heading forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122710993.XU CN215922458U (en) | 2021-11-08 | 2021-11-08 | Electric bicycle center shaft square sleeve assembly and square sleeve cold heading forming die |
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| Publication Number | Publication Date |
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| CN215922458U true CN215922458U (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122710993.XU Active CN215922458U (en) | 2021-11-08 | 2021-11-08 | Electric bicycle center shaft square sleeve assembly and square sleeve cold heading forming die |
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| CN (1) | CN215922458U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810795A (en) * | 2022-04-08 | 2022-07-29 | 江苏益铖金属成型有限公司 | Middle shaft for electric bicycle and processing technology thereof |
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2021
- 2021-11-08 CN CN202122710993.XU patent/CN215922458U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810795A (en) * | 2022-04-08 | 2022-07-29 | 江苏益铖金属成型有限公司 | Middle shaft for electric bicycle and processing technology thereof |
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