CN212690747U - Transmission gear and transmission gear assembly - Google Patents
Transmission gear and transmission gear assembly Download PDFInfo
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- CN212690747U CN212690747U CN202021079990.XU CN202021079990U CN212690747U CN 212690747 U CN212690747 U CN 212690747U CN 202021079990 U CN202021079990 U CN 202021079990U CN 212690747 U CN212690747 U CN 212690747U
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- oil
- transmission gear
- conical surface
- thread
- oil scraping
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Abstract
The transmission gear is provided with a combination tooth outer conical surface and is characterized in that an oil scraping thread structure used for damaging an oil film is arranged on the combination tooth outer conical surface and comprises a heightening bottom layer and an oil scraping thread arranged on the top surface of the heightening bottom layer, the heightening bottom layer is integrally formed on the combination tooth outer conical surface along the circumferential direction, and the oil scraping thread extends to a conical surface overrun groove at the inner end of the combination tooth outer conical surface along the circumferential direction in a spiral mode from the outer end surface of the combination tooth outer conical surface. The utility model discloses can destroy the oil film between the friction pair of synchronizer ring and gear, the oil film is destroyed between the back lubricating oil stream to adjacent thread in the frizing screw thread, and the coefficient of friction between synchronizer ring and gear increases, and the time of shifting this moment is shorter, and it is better to shift the gear, and the life of synchronizer can obtain guaranteeing. The utility model also provides a derailleur gear assembly.
Description
Technical Field
The utility model relates to a derailleur gear and derailleur gear assembly belongs to derailleur inner structure technical field.
Background
The inner conical surface of the synchronous ring of the existing transmission adopts a carbon sticking or molybdenum spraying process to increase the friction coefficient of the outer conical surface of the gear combined tooth, thereby achieving the purposes of increasing the synchronous capacity, improving the gear shifting hand feeling and prolonging the service life of the synchronizer.
Although the friction coefficient of a friction pair is increased by adopting molybdenum spraying and carbon pasting processes on the inner conical surface of the synchronous ring, the original oil drainage groove of the inner conical surface of the synchronous ring is difficult to keep continuously due to the process limitation. When the transmission is shifted, because no oil drainage groove or limited oil drainage quantity of the oil drainage groove is formed between the conical surfaces of the synchronizing ring and the gear combination teeth, lubricating oil cannot be drained in time, an oil film is formed between the inner conical surface of the synchronizing ring and the outer conical surface friction pair of the gear combination teeth, the friction coefficient of the friction pair is reduced, the shifting time is prolonged, the shifting hand feeling is poor (shifting or tooth beating is easy to realize), and the service life of the synchronizer is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model provides a derailleur gear and derailleur gear assembly can destroy the oil film between the friction pair of synchronizer ring and gear, and the oil film is destroyed between the adjacent thread in the back lubricating oil stream to the frizing screw thread, and the coefficient of friction between synchronizer ring and gear increases, and the time of shifting this moment is shorter, and it is better to shift to feel, and the life of synchronizer can obtain guaranteeing.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the transmission gear is provided with a combination tooth outer conical surface and is characterized in that an oil scraping thread structure used for damaging an oil film is arranged on the combination tooth outer conical surface and comprises a heightening bottom layer and an oil scraping thread arranged on the top surface of the heightening bottom layer, the heightening bottom layer is integrally formed on the combination tooth outer conical surface along the circumferential direction, and the oil scraping thread extends to a conical surface overrun groove at the inner end of the combination tooth outer conical surface along the circumferential direction in a spiral mode from the outer end surface of the combination tooth outer conical surface.
Preferably, the thread form angle of the oil scraping thread is 90 degrees, the crest is flat-topped and has the width of 0.5-0.6mm, the height of the oil scraping thread is not more than 1mm, and the maximum width between adjacent threads is not more than 1 mm.
Preferably, the crest of the oil scraping thread is a conical surface parallel to the outer conical surface of the combined tooth.
Preferably, the oil scraping thread structure further comprises an oil discharge groove which is in a straight shape and is communicated with the conical surface overtravel groove and the outer end surface of the conical surface of the combination tooth, and the oil scraping thread is cut off.
Preferably, the number of the oil drainage grooves is a plurality, the oil drainage grooves are uniformly distributed in a spaced manner along the circumferential direction, and the circumferential angle between adjacent oil drainage grooves is greater than 30 degrees.
Preferably, the circumferential width of the oil discharge groove is 2-5 mm, and the depth of the oil discharge groove is at least twice of the thread height of the oil scraping thread.
Preferably, the cross section of the oil discharge groove is in a trapezoid shape flaring upwards, and corners are transited through fillets.
The transmission gear assembly comprises a transmission gear and a synchronizing ring which is sleeved on the transmission gear in a conical surface matching manner, and is characterized in that the transmission gear is the transmission gear.
The utility model has the advantages that:
1. the utility model discloses a transmission gear, set up the frizing helicitic texture on combining the outer conical surface of tooth, wherein bed hedgehopping bottom can reduce the degree of depth in conical surface overrun groove, in order to reduce its stock oil, the frizing screw thread can destroy the vice oil film of friction between synchronizer ring and gear, because the motion extrusion of synchronizer ring when the derailleur is shifted, the frizing screw thread on combining the outer conical surface of tooth strikes off the oil film and destroys, the oil film is destroyed between the adjacent thread in the back lubricating oil stream extremely frizing screw thread, the lubricating oil of synchronous intra-annular conical surface and frizing screw thread crest retention is few this moment, the coefficient of friction between synchronizer ring and gear increases, the time of shifting this moment is shorter, it feels better to shift gears, the life of synchronizer can obtain guaranteeing.
2. Set up the oil drainage groove on the frizing screw thread, the oil drainage groove is a style of calligraphy and cuts the frizing screw thread, and set up the tooth form angle of frizing screw thread into 90 degrees, between adjacent thread in the lubricating oil stream to the frizing screw thread, lubricating oil can flow into the oil drainage groove in the same trend, and from the outer terminal surface of flowing to the outer conical surface of combination tooth in the oil drainage groove, in order to realize the quick discharge of lubricating oil, reduce the oil storage volume between derailleur gear and the synchronizer ring, make unable oil film that forms between the friction pair between the two, guarantee effective frictional contact between the two.
Drawings
Fig. 1 is a half-sectional view of a transmission gear of the present invention.
Fig. 2 is a partially enlarged schematic view of fig. 1.
Fig. 3 is a perspective view of a transmission gear.
FIG. 4 is a schematic view of a transmission gear assembly.
Detailed Description
The following describes embodiments of the present invention in detail with reference to fig. 1 to 4.
The transmission gear is provided with a combined tooth outer conical surface 1 and is characterized in that an oil scraping thread structure used for damaging an oil film is arranged on the combined tooth outer conical surface 1 and comprises a heightening bottom layer 3 and an oil scraping thread 2 arranged on the top surface of the heightening bottom layer 3, the heightening bottom layer 3 is integrally formed on the combined tooth outer conical surface 1 along the circumferential direction, and the oil scraping thread 2 spirally extends to a conical surface overrun groove 11 at the inner end of the combined tooth outer conical surface 1 along the circumferential direction from the outer end surface of the combined tooth outer conical surface 1.
The transmission gear, set up the frizing helicitic texture on combining tooth external cone 1, wherein bed hedgehopping bottom 3 can reduce the degree of depth of conical surface overrun groove, in order to reduce its stock oil, frizing screw thread 2 can destroy the oil film between the friction pair of synchronizer ring and gear, because the motion extrusion of synchronizer ring when the derailleur is shifted, the frizing screw thread on combining the tooth external cone strikes off the oil film and destroys, oil film is destroyed between the adjacent thread in the back lubricating oil flows to frizing screw thread 2, the lubricating oil that remains between synchronizer ring internal cone and frizing screw crest is few this moment, the coefficient of friction increase between synchronizer ring and gear, shift time this moment is shorter, it feels better to shift gears, the life of synchronous ware can obtain guaranteeing.
The thread form angle alpha of the oil scraping thread 2 is 90 degrees, the oil storage capacity between adjacent threads is reduced, lubricating oil can flow smoothly between the adjacent threads in the oil scraping thread 2 conveniently, the crest is flat-topped, the width D is 0.5-0.6mm, a friction pair can be formed between the crest and the inner conical surface of the synchronous ring conveniently, the height H of the threads of the oil scraping thread 2 is not more than 1mm, the maximum width D1 between the adjacent threads is not more than 1mm, and the thread density is ensured so that the threads can effectively break an oil film in the gear rotating process.
The crest of the oil scraping thread 2 is a conical surface parallel to the outer conical surface 1 of the combined tooth. The conical fit between the transmission gear and the synchronizing ring can be effectively maintained.
The oil scraping thread structure further comprises an oil discharge groove 4, the oil discharge groove 4 is in a straight shape, and the outer end face of the conical surface overtravel groove 11 and the outer end face of the combined tooth conical surface 1 are communicated and cut off the oil scraping thread 2. When the lubricating oil flows between adjacent threads in the oil scraping thread 2, the lubricating oil can flow into the oil discharge groove 4 along the same direction and flows to the outer end surface of the outer conical surface 1 of the combined tooth from the oil discharge groove 4, so that the lubricating oil can be discharged quickly, the oil storage amount between the transmission gear and the synchronizing ring is reduced, an oil film cannot be formed between a friction pair between the transmission gear and the synchronizing ring, and the effective frictional contact between the transmission gear and the synchronizing ring is ensured.
The oil discharge grooves 4 are distributed in a circumferential uniform isolation manner, and the circumferential angle between every two adjacent oil discharge grooves 4 is greater than 30 degrees. The circumferential width of the oil discharge groove 4 is 2-5 mm, and the depth of the oil discharge groove 4 is at least twice of the thread height of the oil scraping thread 2. Can guarantee the timely discharge of fluid, avoid setting up of oil extraction groove 4 to influence the destruction of frizing screw thread 2 to the oil film again.
The cross section of the oil discharge groove 4 is in a trapezoid shape with an upward flaring, and corners are transited through fillets. The oil discharge efficiency of the oil discharge groove 4 is improved.
The transmission gear assembly comprises a transmission gear and a synchronizing ring 5 which is sleeved on the transmission gear in a conical surface matching manner, and is characterized in that the transmission gear is the transmission gear. Above derailleur gear assembly, because the motion extrusion of synchronizer ring when the derailleur is shifted, combine the frizing screw thread on the outer conical surface of tooth to strike off the oil film and destroy, the oil film is destroyed between the adjacent thread in the lubricating oil stream extremely frizing screw thread, and the lubricating oil of reserving between synchronizer ring inner conical surface and the frizing screw thread crest is very little this moment, and the coefficient of friction between synchronizer ring and gear increases, and the time of shifting this moment is shorter, and it is better to shift the hand, and the life of synchronous ware can be guaranteed. The lubricating oil can flow into the oil discharge groove along the same direction and flow to the outer end face of the outer conical surface of the combined tooth from the oil discharge groove so as to realize quick discharge of the lubricating oil, reduce the oil storage amount between the transmission gear and the synchronous ring, ensure that an oil film cannot be formed between a friction pair between the transmission gear and the synchronous ring and ensure effective frictional contact between the transmission gear and the synchronous ring.
The technical solutions of the embodiments of the present invention are completely described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (8)
1. The transmission gear is provided with a combined tooth outer conical surface (1) and is characterized in that an oil scraping thread structure used for damaging an oil film is arranged on the combined tooth outer conical surface (1), the oil scraping thread structure comprises a heightening bottom layer (3) and an oil scraping thread (2) arranged on the top surface of the heightening bottom layer (3), the heightening bottom layer (3) is integrally formed on the combined tooth outer conical surface (1) along the circumferential direction, and the oil scraping thread (2) extends to a conical surface overrun groove (11) at the inner end of the combined tooth outer conical surface (1) along the circumferential direction in a spiral mode from the outer end surface of the combined tooth outer conical surface (1).
2. A transmission gear according to claim 1, characterised in that the profile angle of the oil scraping thread (2) is 90 degrees, the crest is flat and has a width of 0.5-0.6mm, the height of the oil scraping thread (2) is not more than 1mm and the maximum width between adjacent threads is not more than 1 mm.
3. A transmission gear according to claim 2, characterised in that the crest of the oil scraping thread (2) is a cone parallel to the coupling tooth external cone (1).
4. The transmission gear according to claim 2, wherein the oil scraping thread structure further comprises an oil discharge groove (4), and the oil discharge groove (4) is in a straight shape, communicates the outer end faces of the tapered overrun groove (11) and the engaging tooth outer tapered face (1), and cuts off the oil scraping thread (2).
5. A transmission gear according to claim 4, characterized in that the oil discharge grooves (4) are provided in a plurality and uniformly spaced apart in the circumferential direction, and adjacent oil discharge grooves (4) are spaced apart by a circumferential angle greater than 30 degrees.
6. A transmission gear according to claim 5, characterized in that the circumferential width of the oil drainage groove (4) is 2-5 mm, and the depth of the oil drainage groove (4) is at least twice the thread height of the oil scraping thread (2).
7. Transmission gear according to claim 5, characterized in that the oil drain groove (4) is trapezoidal in cross section flaring upwards with rounded corners.
8. A transmission gear assembly comprising a transmission gear and a synchronizing ring (5) fitted over the transmission gear in a conical surface, characterized in that the transmission gear is a transmission gear according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021079990.XU CN212690747U (en) | 2020-06-12 | 2020-06-12 | Transmission gear and transmission gear assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021079990.XU CN212690747U (en) | 2020-06-12 | 2020-06-12 | Transmission gear and transmission gear assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212690747U true CN212690747U (en) | 2021-03-12 |
Family
ID=74890139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021079990.XU Active CN212690747U (en) | 2020-06-12 | 2020-06-12 | Transmission gear and transmission gear assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212690747U (en) |
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2020
- 2020-06-12 CN CN202021079990.XU patent/CN212690747U/en active Active
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