CN210371971U - Derailleur shift fork mechanism of shifting - Google Patents
Derailleur shift fork mechanism of shifting Download PDFInfo
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- CN210371971U CN210371971U CN201920944306.0U CN201920944306U CN210371971U CN 210371971 U CN210371971 U CN 210371971U CN 201920944306 U CN201920944306 U CN 201920944306U CN 210371971 U CN210371971 U CN 210371971U
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Abstract
The utility model discloses a derailleur shift fork mechanism of shifting, including shift fork assembly and the synchronous ware assembly of shifting. The gear-shifting fork assembly comprises a fork shaft, a fork connecting sleeve and a fork; a shifting fork of the shifting fork assembly is fixedly connected to a shifting fork shaft through a shifting fork connecting sleeve; the end part of the shifting fork is sleeved with a metal sleeve; a gear sleeve groove is formed in the circumferential direction of the side wall of the outer ring of the synchronizer gear sleeve of the synchronizer assembly; when the gear shifting fork assembly works, the gear shifting fork assembly moves to drive the shifting fork to move, so that the upper friction surface and the lower friction surface of the metal sleeve are in contact with the upper surface and the lower surface of a gear sleeve groove on the synchronizer gear sleeve, and the synchronizer gear sleeve is pushed to move and shift gears. The mechanism avoids the functional problems of gear beating and gear disengaging of the transmission caused by the fact that the shifting stroke of the gear sleeve of the synchronizer is not in place due to damage of the shifting fork, improves the gear shifting quality of the transmission, and reduces the production cost.
Description
Technical Field
The utility model relates to a derailleur field, concretely relates to derailleur shift fork mechanism that shifts.
Background
A prior art transmission shift fork mechanism is shown in fig. 1-4. Derailleur shift fork mechanism includes: shift fork assembly 1 and synchronous ware assembly 2 shift. The gear shifting fork assembly 1 is provided with a fork shaft 12, a fork connecting sleeve 13 and a fork 14, the gear shifting fork assembly 1 is slidably connected to a shaft hole of the transmission box body through the upper end 122 of the fork shaft and the lower end 121 of the fork shaft on the fork shaft 12, the fork 14 is fixedly connected to the fork shaft 12 through the fork connecting sleeve 13, a plastic sleeve 0141 connected through an inner cavity 01412 in a matched injection molding mode is arranged at the end 0142 of the fork 14, and a gear sleeve groove 211 is formed in the circumferential direction of the outer ring of a synchronizer gear sleeve 21 of the synchronizer assembly 2.
During gear shifting, the shift fork assembly 1 moves to drive the shift fork 14 to move, so that the upper and lower friction surfaces 01411 of the plastic sleeve 0141 are in upper and lower surface contact with the gear sleeve groove 211 on the synchronizer gear sleeve 21, and the synchronizer gear sleeve 21 is pushed to move and shift gears. Due to the fact that the synchronizer gear sleeve 21 rotates at a high speed, and the inevitable deflection of the synchronizer gear sleeve 21 around the central axis is accompanied, the upper and lower surfaces of the gear sleeve groove 211 continuously knock and unevenly extrude the upper and lower friction surfaces 01411 of the plastic sleeve 0141, and finally the upper and lower friction surfaces 01411 are cracked, crushed, fall off, excessively worn and the like, so that the gear shifting stroke of the synchronizer gear sleeve 21 is not in place, and the functional problems of gear shifting, gear shifting and the like of a transmission are caused.
Disclosure of Invention
The utility model discloses a derailleur shift fork mechanism of shifting can improve the wearability, the shock resistance of shift fork of shifting, and extension shift fork life avoids the functional problem such as beating the tooth, taking off the gear that leads to because of shift fork wearing and tearing, improves the quality of shifting of derailleur.
The utility model discloses a transmission gear shifting fork mechanism, which comprises a gear shifting fork assembly and a synchronizer assembly;
the gear-shifting fork assembly comprises a fork shaft, a fork connecting sleeve and a fork; a shifting fork of the gear-shifting fork assembly is fixedly connected to a shifting fork shaft through a shifting fork connecting sleeve; the end part of the shifting fork is sleeved with a metal sleeve; the metal sleeve consists of an upper friction surface and a lower friction surface, the end part of the upper friction surface is an upper end bulge, the end part of the lower friction surface is a lower end bulge, and the upper end bulge and the lower end bulge are oppositely fixed to clamp the end part of the shifting fork;
a gear sleeve groove is formed in the circumferential direction of the side wall of the outer ring of the synchronizer gear sleeve of the synchronizer assembly;
when the gear shifting fork assembly works, the gear shifting fork assembly moves to drive the shifting fork to move, so that the upper and lower friction surfaces of the metal sleeve are in contact with the upper and lower surfaces of a gear sleeve groove on the synchronizer gear sleeve, and the synchronizer gear sleeve is pushed to move and shift gears.
Furthermore, side face flanges extend out of the joint side faces of the upper friction face and the lower friction face of the metal sleeve; the side flanges clamp the end of the shifting fork.
Furthermore, the end part of the shifting fork is provided with an anti-falling groove, and the anti-falling groove is matched and clamped with the upper end protrusion and the lower end protrusion.
Furthermore, the end part of the shifting fork is also provided with an anti-deviation chamfer which is matched and clamped with the side face flange.
Furthermore, the shifting fork assembly is used for being connected on the shaft hole of the transmission box body in a sliding mode through the upper end of a shifting fork shaft on the shifting fork shaft and the lower end of the shifting fork shaft.
Further, the metal sleeve is made of spring steel materials through heat treatment processing.
The utility model discloses beneficial technological effect does: when the gear is shifted, the shifting fork assembly moves to drive the shifting fork to move, so that the friction surfaces of the upper part and the lower part of the metal sleeve are in contact with the upper surface and the lower surface of the gear sleeve groove on the synchronizer gear sleeve to push the synchronizer gear sleeve to move and shift, and the upper surface and the lower surface of the gear sleeve groove can be continuously knocked and the friction surfaces of the upper part and the lower part can be extruded in an unbalanced manner along with the inevitable deflection of the synchronizer gear sleeve around the central axis due to the high-speed rotation of the synchronizer gear. The metal sleeve is made of a spring steel material through heat treatment processing, so that the problems of cracking, crushing, falling, transition abrasion and the like caused by the plastic sleeve can be effectively prevented, the functional problems of gear beating and gear falling of the transmission caused by the fact that the shifting stroke of the synchronizer gear sleeve is not in place due to damage of the shifting fork are avoided, and the gear shifting quality of the transmission is improved. The end part of the shifting fork is firmly clamped by the upper end bulge, the lower end bulge and the side face flange of the metal sleeve, the end part of the shifting fork is firmly clamped and matched in the shifting process, the friction surfaces of the upper part and the lower part are also tightly contacted and matched with the upper surface and the lower surface of the gear sleeve groove, and smooth shifting and quality are guaranteed.
Drawings
FIG. 1 is a schematic view of a prior art transmission shift fork mechanism;
FIG. 2 is a schematic view of a prior art transmission shift fork assembly;
FIG. 3 is a schematic view of a prior art transmission shift fork;
FIG. 4 is a schematic view of a prior art plastic encasement;
FIG. 5 is a schematic view of a transmission shift fork mechanism of the present invention;
FIG. 6 is a schematic view of a transmission shift fork assembly of the present invention;
FIG. 7 is a schematic view of a transmission shift fork of the present invention;
fig. 8 is a schematic view of the metal sleeve of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments.
The utility model discloses a derailleur shift fork mechanism of shifting, including shift fork assembly 1 and synchronous ware assembly 2 of shifting. The gear shifting fork assembly 1 comprises a fork shaft 12, a fork connecting sleeve 13 and a fork 14. A shifting fork 14 of the shifting fork assembly 1 is fixedly connected to a shifting fork shaft 12 through a shifting fork connecting sleeve 13. A metal sleeve 141 is sleeved on the end part of the shifting fork 14; the metal sleeve 141 is composed of upper and lower friction surfaces 1411. The end part of the upper friction surface 1411 is provided with an upper end bulge 1413, the end part of the lower friction surface 1411 is provided with a lower end bulge 1414, and the joint side surfaces of the upper friction surface 1411 and the lower friction surface 1411 of the metal sleeve 141 extend out of a side surface retaining edge 1412.
The end of the shifting fork 14 is provided with a drop-proof groove 142, and the drop-proof groove 142 is matched and clamped with the upper end bulge 1413 and the lower end bulge 1414 to prevent the metal sleeve 141 from dropping; the end of the shifting fork 14 is also provided with an anti-deviation chamfer 143, the anti-deviation chamfer 143 is matched and clamped with the side blocking edge 1412, and the metal sleeve 141 swings left and right.
A gear sleeve groove 211 is formed in the circumferential direction of the side wall of the outer ring of a synchronizer gear sleeve 21 of the synchronizer assembly 2;
during operation, the shifting fork assembly 1 moves to drive the shifting fork 14 to move, so that the upper friction surface 1411 and the lower friction surface 1411 of the metal sleeve 141 are in contact with the upper surface and the lower surface of the gear sleeve groove 211 on the synchronizer gear sleeve 21, and the synchronizer gear sleeve 21 is pushed to move and shift gears.
The gear shifting fork assembly 1 is connected to the shaft hole of the transmission box body in a sliding mode through the upper end 122 of the shifting fork shaft and the lower end 121 of the shifting fork shaft on the shifting fork shaft 12.
The metal sleeve 141 is made of spring steel material through heat treatment processing.
The transmission shifting fork mechanism with the structure shifts gears in a driving state, the shifting fork assembly 1 moves to drive the shifting fork 14 to move, so that the friction surfaces 1411 of the upper part and the lower part of the metal sleeve 141 are in contact with the upper surface and the lower surface of the gear sleeve groove 211 on the synchronizer gear sleeve 21, and the synchronizer gear sleeve 21 is pushed to move and shift gears. Because the synchronizer gear sleeve 21 rotates at a high speed, and the upper and lower surfaces of the gear sleeve groove 211 are continuously knocked and unevenly extruded to form the upper and lower friction surfaces 1411 along with the inevitable deflection of the synchronizer gear sleeve 21 around the central axis, the problems of cracking, crushing, falling, transitional wear and the like caused by a plastic sleeve can be effectively prevented because the metal sleeve 141 is made of a spring steel material through heat treatment, the functional problems of gear beating and gear falling of a transmission caused by the fact that the gear shifting stroke of the synchronizer gear sleeve 21 is not in place due to the damage of a shifting fork are avoided, and the gear shifting quality of the transmission is improved. Meanwhile, the plastic sleeve injection molding material has low utilization rate, pollutes the environment and has low part molding efficiency, and the metal sleeve 141 can be formed by punching the spring steel plate, so that the material consumption is low, the molding is fast, the efficiency is high and the cost is low, thereby reducing the production cost.
Claims (6)
1. The utility model provides a derailleur shift fork mechanism that shifts which characterized in that: comprises a gear-shifting fork assembly (1) and a synchronizer assembly (2);
the gear-shifting fork assembly (1) comprises a fork shaft (12), a fork connecting sleeve (13) and a fork (14); a shifting fork (14) of the gear-shifting fork assembly (1) is fixedly connected to a shifting fork shaft (12) through a shifting fork connecting sleeve (13); a metal sleeve (141) is sleeved at the end part of the shifting fork (14); the metal sleeve (141) is composed of an upper friction surface (1411) and a lower friction surface (1411), the end part of the upper friction surface (1411) is provided with an upper end bulge (1413), the end part of the lower friction surface (1411) is provided with a lower end bulge (1414), and the upper end bulge (1413) and the lower end bulge (1414) are oppositely fixed to clamp the end part of the shifting fork (14);
a gear sleeve groove (211) is formed in the circumferential direction of the side wall of the outer ring of a synchronizer gear sleeve (21) of the synchronizer assembly (2);
during operation, the shifting fork assembly (1) moves to drive the shifting fork (14) to move, so that the upper and lower friction surfaces (1411) of the metal sleeve (141) are in contact with the upper and lower surfaces of a gear sleeve groove (211) on the synchronizer gear sleeve (21), and the synchronizer gear sleeve (21) is pushed to move and shift gears.
2. A transmission shift fork mechanism according to claim 1, wherein:
the side surface of the joint of the upper friction surface (1411) and the lower friction surface (1411) of the metal sleeve (141) extends out of a side surface retaining edge (1412); the side blocking edge (1412) blocks the end part of the shifting fork (14).
3. A transmission shift fork mechanism according to claim 1 or claim 2, wherein: the end part of the shifting fork (14) is provided with a separation-proof groove (142), and the separation-proof groove (142) is matched and clamped with the upper end protrusion (1413) and the lower end protrusion (1414).
4. A transmission shift fork mechanism according to claim 3, wherein: the end part of the shifting fork (14) is also provided with an anti-deviation chamfer (143), and the anti-deviation chamfer (143) is matched and clamped with the side face flange (1412).
5. A transmission shift fork mechanism according to claim 3, wherein: the gear-shifting fork assembly (1) is connected to a shaft hole of the transmission box body in a sliding mode through the upper end (122) of a shifting fork shaft and the lower end (121) of the shifting fork shaft on the shifting fork shaft (12).
6. A transmission shift fork mechanism according to claim 5, wherein: the metal sleeve (141) is made of spring steel materials through heat treatment processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920944306.0U CN210371971U (en) | 2019-06-21 | 2019-06-21 | Derailleur shift fork mechanism of shifting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920944306.0U CN210371971U (en) | 2019-06-21 | 2019-06-21 | Derailleur shift fork mechanism of shifting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210371971U true CN210371971U (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920944306.0U Active CN210371971U (en) | 2019-06-21 | 2019-06-21 | Derailleur shift fork mechanism of shifting |
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| CN (1) | CN210371971U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131411A (en) * | 2019-06-21 | 2019-08-16 | 重庆青山工业有限责任公司 | A kind of transmission selector fork mechanism |
| CN112096857A (en) * | 2020-09-18 | 2020-12-18 | 陕西法士特齿轮有限责任公司 | High-integration-level electric control mechanical automatic transmission |
-
2019
- 2019-06-21 CN CN201920944306.0U patent/CN210371971U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131411A (en) * | 2019-06-21 | 2019-08-16 | 重庆青山工业有限责任公司 | A kind of transmission selector fork mechanism |
| CN112096857A (en) * | 2020-09-18 | 2020-12-18 | 陕西法士特齿轮有限责任公司 | High-integration-level electric control mechanical automatic transmission |
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