CN2228046Y - Front fork joint of cycle - Google Patents
Front fork joint of cycle Download PDFInfo
- Publication number
- CN2228046Y CN2228046Y CN 95222551 CN95222551U CN2228046Y CN 2228046 Y CN2228046 Y CN 2228046Y CN 95222551 CN95222551 CN 95222551 CN 95222551 U CN95222551 U CN 95222551U CN 2228046 Y CN2228046 Y CN 2228046Y
- Authority
- CN
- China
- Prior art keywords
- front fork
- standpipe
- diameter
- joint
- internal diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Steering Devices For Bicycles And Motorcycles (AREA)
Abstract
The utility model relates to a bicycle front fork joint, comprising a front fork joint and a front fork vertical pipe. The front fork joint is composed of a hollow neck part and two front fork bones. The thickness of the pipe wall of the hollow neck part of the front fork part is increased inward to form a hollow circular hole whose internal diameter is relatively small. One small segment of the top of the hollow circular hole is provided with a cone part whose internal diameter is increased upward; the corresponding part of the bottom end of the front fork vertical pipe forms a sheathing sleeve whose external diameter is relatively small. The top of the sheathing pipe is a positioning conical surface whose external diameter is increased gradually, and the internal diameter of the front fork vertical pipe decreases downward from the lower part of a straight pipe gradually. The thickness of the pipe wall of a force application position is relatively big, and the strength is increased. The precision positioning is achieved through the high-precision adding assembly of the cone part and the conical surface.
Description
The utility model relates to a kind of attachments of a bicycle, relates in particular to a kind of bicycle front fork joint.
Present bicycle towards the lightweight development, its vehicle frame mostly is aluminum alloy or carbon fibre tube constitutes, on the whole its part also adopts the aluminum alloy moulding, thereby after making the front fork joint and standpipe of front fork engaging, the neck of front fork joint is easy to generate stress concentration and the phenomenon that chaps, for this reason, the inventor once designed a kind of front fork joint structure-improved, the hollow round hole that it is characterized in that the hollow stem of front fork joint is that footpath, garden, a upper end is big so that be tapered to the less interior tapered hole in circle footpath, lower end, and the end of standpipe of front fork with matching also is shrunk to cooresponding taper, it is intended to not change under the size of each related accessory, and the meat thick (thickness of pipe) that increases front fork joint neck increases the intensity of front fork joint.This structural improvement is received the effect of expection really, but the hollow round hole of this neck convergent need to adopt the lost wax casting mode to process, and whole fit face needs precision cast and high-precision processing, therefore cause productive costs height and the lower puzzlement of casting property fiduciary level, so need further to improve.
The purpose of this utility model is to provide a kind of new construction of bicycle front fork joint, so that processing is simpler, and reliable in function, and productive costs is low.
The purpose of this utility model is to realize like this, a kind of bicycle front fork joint, include front fork joint, standpipe of front fork, wherein the front fork joint is by being formed by a hollow stem and to two antefurcas of both sides extension, the solid standpipe of front fork of cover in hollow stem, the hollow stem that it is characterized in that the front fork joint, be that an external diameter does not change, thickness of pipe is inwardly thickeied and formed the original little hollow round hole of internal diameter of an internal diameter, a bit of upwards oblique cone position of expansion of internal diameter that is provided with, this hollow round hole top; Standpipe of front fork comprises major diameter pipeline section and than the fit pipeline section two of minor diameter partly, and the top of fit pipeline section is the mild cumulative orientational cone-shaped surface of outer radial major diameter pipeline section, the inclined-plane at the oblique cone position on this conical surface and front fork joint hollow round hole top matches, the internal diameter of standpipe of front fork dwindles down gradually for the place, bottom from the large diameter pipe section, and the diameter of standpipe of front fork major diameter pipeline section and former standpipe of front fork equal diameters commonly used.
Above-mentioned new construction front fork joint, it had both made this standpipe of front fork force part have bigger thickness of pipe and the intensity increase, only need again to implement precision cast and high-precision processing in the oblique cone position on this hollow round hole top and the orientational cone-shaped surface place on fit pipe top, just can realize the precise placement of front fork joint and standpipe of front fork, thereby make original whole fit face detailed manufacture be converted into the detailed manufacture of local fitting surface, make the utility model simplify processing greatly, reduced productive costs, and its smart casting matter fiduciary level improves.
Come structure of the present utility model is done further narration with embodiment and accompanying drawing below.
Description of drawings
Fig. 1 is a view sub-anatomy of the present utility model
Fig. 2 is a combination scheme drawing of the present utility model
By Fig. 1, shown in 2 as seen, the utility model includes a front fork joint 10 and a standpipe of front fork 20, wherein front fork joint 10 is to be made with aluminum alloy or other composite materials, it is positioned at the hollow stem 11 of central authorities by one and is constituted to symmetrical two antefurcas 12 that extend of two sides, it is characterized in that hollow stem is a hollow form pipe, and its thickness of pipe is thickeied inwardly, make the internal diameter of its hollow round hole 13 little than what use always, the top of this circular hole 13 is a bit of to be provided with the oblique cone position 131 that internal diameter enlarges up, and circular hole 13 bottoms are the internal diameter spacing hole 132 little than the hollow round hole aperture; And be inserted in the standpipe of front fork 20 of this hollow round hole 13, also corresponding part forms the external diameter fit pipe 21 little than the upper tubular section diameter in its bottom, and in the upper tubular section, the external diameter all specification with commonly used is identical, it in the turning point of fit pipe 21 and upper tubular section an external diameter cumulative orientational cone-shaped surface 211 that makes progress gently, aperture, place, bottom at last pipeline section internal diameter dwindles down gradually, and form conial tube 2 in, like this, making the tube wall of standpipe of front fork 20 force parts and fit pipe 21 all have bigger tube wall thickens, and the conical surface 131 that utilizes front fork joint 10 cooperates with the conical surface 211 of standpipe of front fork 20, can reach location very critically.In addition, the spacing hole bottom the front fork joint then can make the positioning function of standpipe of front fork insertion front fork joint better if be aided with the glue that adapts to thickness.
This shows that this creation only needs to carry out general cutting or smart casting processing in the orientational cone-shaped surface 211 on the oblique cone position 131 on circular hole 13 tops and fit pipe 21 tops, just can realize fine assembly, and can guarantee intensity and not produce be full of cracks.
As seen by shown in Figure 2, because the external diameter of the hollow stem of front fork joint 10 of the present utility model does not change, so following bulb stopper 31 size constancies that are mated, correlated partss such as earth nest 32, pearl bowl 33 and head tube 34 all can be continued to use relatively; Its standpipe of front fork 20 parts of while, cause has only the external diameter of bottom fit pipe 21 parts to reduce and the internal diameter of lower semisection dwindles into outside the interior tapered hole 22 gradually, the size of all the other calibers does not all change, so that matches with it goes up correlated partss such as bowl 35, driver's montant 36 and triangle nut 37 and also can continue to use, do not have fully that part specifications causes can not interchangeability problem exist.
This shows the front fork joint that adopts this structure, can need not change under the situation of its correlated parts that with easy structure, easy processing just can realize that front fork joint neck does not produce be full of cracks and its joint intensity height and the low purpose of productive costs.
Claims (1)
1, a kind of bicycle front fork joint, include front fork joint, standpipe of front fork, wherein the front fork joint is by being formed by a hollow stem and to two antefurcas of both sides extension, the solid standpipe of front fork of cover in hollow stem, the hollow stem that it is characterized in that the front fork joint, be that an external diameter does not change, thickness of pipe is inwardly thickeied and formed the original little hollow round hole of internal diameter of an internal diameter, a bit of upwards oblique cone position of expansion of internal diameter that is provided with, this hollow round hole top; Standpipe of front fork comprises major diameter pipeline section and than the fit pipeline section two of minor diameter partly, and the top of fit pipeline section is the mild cumulative orientational cone-shaped surface of outer radial major diameter pipeline section, the inclined-plane at the oblique cone position on this conical surface and front fork joint hollow round hole top matches, the internal diameter of standpipe of front fork dwindles down gradually for the place, bottom from the large diameter pipe section, and the diameter of standpipe of front fork major diameter pipeline section and former standpipe of front fork equal diameters commonly used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95222551 CN2228046Y (en) | 1995-09-29 | 1995-09-29 | Front fork joint of cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95222551 CN2228046Y (en) | 1995-09-29 | 1995-09-29 | Front fork joint of cycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2228046Y true CN2228046Y (en) | 1996-05-29 |
Family
ID=33869847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95222551 Expired - Fee Related CN2228046Y (en) | 1995-09-29 | 1995-09-29 | Front fork joint of cycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2228046Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730594A (en) * | 2014-12-30 | 2016-07-06 | 什拉姆有限责任公司 | Bicycle steerer tube with variant stiffness |
-
1995
- 1995-09-29 CN CN 95222551 patent/CN2228046Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730594A (en) * | 2014-12-30 | 2016-07-06 | 什拉姆有限责任公司 | Bicycle steerer tube with variant stiffness |
| US10328993B2 (en) | 2014-12-30 | 2019-06-25 | Sram, Llc | Bicycle steerer tube with variant stiffness |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |