CN108510967B - String fine-tuning through face gear planetary transmission - Google Patents
String fine-tuning through face gear planetary transmission Download PDFInfo
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- CN108510967B CN108510967B CN201810594302.4A CN201810594302A CN108510967B CN 108510967 B CN108510967 B CN 108510967B CN 201810594302 A CN201810594302 A CN 201810594302A CN 108510967 B CN108510967 B CN 108510967B
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- 230000005540 biological transmission Effects 0.000 title abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000013016 damping Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 208000023514 Barrett esophagus Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
- G10D3/00—Details of, or accessories for, stringed musical instruments, e.g. slide-bars
- G10D3/14—Tuning devices, e.g. pegs, pins, friction discs or worm gears
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Retarders (AREA)
Abstract
The invention relates to a tuning device of a string instrument, in particular to a string fine tuning mechanism driven by face gears through planetary transmission. Comprises a winding drum shaft, a positioning shaft rotatably sleeved outside the winding drum shaft and a positioning mandrel rotatably sleeved inside the winding drum shaft; a first section on the same side of the positioning shaft, the spool shaft and the positioning mandrel is provided with a face gear, a second face gear and a third face gear respectively, the number of teeth of the first face gear is the same as that of the third face gear, and the number of teeth of the second face gear is different from that of the first face gear and the third face gear; one end of the positioning shaft, which is provided with a first face gear, is also provided with a knob cover capable of rotating along the central axis of the positioning shaft, a rotating shaft perpendicular to the central axis of the positioning shaft is arranged in the knob cover, and one end of the rotating shaft is provided with a planetary gear which is simultaneously meshed with the first face gear, the second face gear and the third face gear. The invention aims to realize fine adjustment of the tightness of strings, and has low noise during string adjustment and little influence of temperature and humidity.
Description
Technical Field
The invention relates to a tuning device of a string instrument, in particular to a string fine tuning mechanism driven by face gears through planetary transmission.
Background
String instruments such as violins and cellos need to be subjected to string tuning before use, so that optimal tone color is guaranteed during playing, and particularly, string tuning is important for violins.
At present, a through hole is usually formed in the head part of the piano, a solid wood tuning rod is inserted into the two holes, strings are fixed and coiled on the tuning rod, and the tuning rod is rotated to tune and fix strings through a knob fixed on the tuning rod. However, the strings cannot be fine-tuned in this way, so that the tuning accuracy is poor. And the operation is inconvenient, and the abrasion to the piano itself is easy to cause each time of setting strings. The effect of temperature, humidity etc. is great, can produce great noise when using, and the precision and the quality of string all can receive the influence, and long-term result of use is not good.
Disclosure of Invention
The invention aims to provide a string fine tuning mechanism which is driven by a face gear planet and can realize fine tuning of the string tightness, and the string tuning noise is low and the influence of temperature and humidity is low.
In order to solve the technical problems, the invention adopts the following technical scheme: the string fine tuning mechanism comprises a winding drum shaft, a positioning shaft rotatably sleeved outside the winding drum shaft and a positioning mandrel rotatably sleeved in the winding drum shaft, wherein the winding drum shaft comprises a winding drum inner shaft which is installed in the positioning shaft in a matched mode and a winding drum outer shaft which is arranged outside the positioning shaft and used for winding strings, a hole used for fixing the strings is formed in the outer shaft of the winding drum, and the positioning mandrel comprises a positioning mandrel inner shaft which is installed in the winding drum shaft in a matched mode and a positioning mandrel outer shaft which is arranged outside the winding drum shaft; a first face gear is coaxially and fixedly arranged at one end, opposite to the outer shaft of the winding drum, of the positioning shaft, a second face gear is coaxially and fixedly arranged at one end, opposite to the outer shaft of the winding drum, of the inner shaft of the winding drum, a third face gear is coaxially and fixedly arranged at one end, opposite to the outer shaft of the positioning core, of the inner shaft of the positioning shaft, the second face gear is rotatably sleeved in the first face gear, the third face gear is rotatably sleeved in the second face gear, the number of teeth of the first face gear is the same as that of the third face gear, and the number of teeth of the second face gear is different from that of the first face gear and the third face gear; one end of the positioning shaft, which is provided with a first face gear, is provided with a knob cover capable of rotating along the central axis of the positioning shaft, a rotating shaft perpendicular to the central axis of the positioning shaft is arranged in the knob cover, and one end of the rotating shaft is provided with a planetary gear which is simultaneously meshed with the first face gear, the second face gear and the third face gear.
Preferably, an annular chute is circumferentially arranged on the positioning shaft, and a convex ring matched with the annular chute is arranged on the inner edge of the knob cover.
Preferably, a plastic pad for increasing the rotation resistance of the knob cover is arranged in the annular chute.
Preferably, the knob cover comprises a first half knob and a second half knob which are fixedly connected through bolts and are symmetrically distributed by taking the central axis of the positioning shaft as the center, and blind holes for respectively rotating and matching the two ends of the rotating shaft are correspondingly formed on the opposite surfaces of the first half knob and the second half knob.
Preferably, the opposite surfaces of the first half knob and the second half knob are correspondingly provided with positioning pins and corresponding pin holes for mutually matched installation.
Preferably, the planetary gear is a spur gear.
Preferably, a spring retainer ring for axially positioning the first face gear, the second face gear and the third face gear is cooperatively arranged on the positioning core inner shaft.
Preferably, the inner shaft of the winding drum and the positioning shaft and the inner shaft of the positioning core and the winding drum shaft are in clearance fit.
Preferably, gum for increasing the damping ratio is provided at the meshing positions of the planetary gear and the first face gear, the second face gear and the third face gear, respectively.
Preferably, protruding stripes for increasing friction force with the body are respectively arranged on the outer circumferences of the positioning shaft and the positioning core outer shaft.
Advantageous effects
The string fine tuning mechanism adopts face gear transmission, the planetary gears can be meshed with the first face gear, the second face gear and the third face gear at the same time, and the positioning core outer shaft and the positioning shaft are respectively fixed in two opposite perforations arranged on the head in the working process, so that the positions of the first face gear and the second face gear are fixed, when the knob cover is rotated, the second face gear is driven by the planetary gears to drive the drum shaft to rotate due to the tooth difference relation between the second face gear and the first face gear, and small rotation angles of the second face gear and the rotation angles of the knob cover are generated, so that the string fixed on the outer shaft of the drum is subjected to tightness fine tuning.
The invention adopts face gear transmission and positioning, has the characteristics of small vibration and low noise, can increase the accuracy of tuning strings, and is vital to tuning strings. Meanwhile, the face gear transmission mode can reduce the complexity of the whole fine adjustment mechanism, reduce the cost, reduce the occupied space and be well suitable for the characteristic of narrow working space. The planet gear preferably adopts a straight-tooth cylindrical gear, so that the planet gear has no axial force, the support can be simplified to adapt to the working space, the weight of the whole fine adjustment mechanism is reduced, and the mechanism is ensured to be simple and compact.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of an explosive structure according to the present invention;
the marks in the figure: 1. the device comprises a positioning mandrel, 101, a positioning core outer shaft, 102, a positioning core inner shaft, 2, a drum shaft, 201, a drum outer shaft, 202, a drum inner shaft, 3, a positioning shaft, 4, a spring retainer ring, 5, a convex ring, 6, an annular sliding groove, 7, a rotating shaft, 8, a knob cover, 801, a first half knob, 802, a second half knob, 803, a positioning pin, 9, a planetary gear, 10, a first face gear, 11, a second face gear, 12 and a third face gear.
Detailed Description
As shown in fig. 1 and 2, the string fine tuning mechanism driven by face gear planetary comprises a spool shaft 2, a positioning shaft 3 rotatably sleeved outside the spool shaft 2, and a positioning mandrel 1 rotatably sleeved inside the spool shaft 2. The positioning mandrel 1 and the positioning shaft 3 are respectively used for being fixed with two opposite perforations arranged at the head part, the winding drum shaft 2 can rotate relative to the positioning mandrel 1 and the positioning shaft 3, and the tightness of the strings is adjusted by being fixed with the strings and further rotating the winding drum shaft 2.
The spool shaft 2 and the positioning mandrel 1 are stepped and comprise a large-diameter section and a small-diameter section which are coaxially connected. The small diameter section of the spool shaft 2 is a spool inner shaft 202 and is cooperatively arranged in the positioning shaft 3, the large diameter section of the spool shaft 2 is a spool outer shaft 201 and is arranged outside the positioning shaft 3 for winding strings, and 1-2 holes for fixing the strings are formed in the spool outer shaft 201. The small diameter section of the positioning mandrel 1 is a positioning mandrel inner shaft 102 and is matched and installed in the winding drum shaft 2, and the large diameter section of the positioning mandrel 1 is a positioning mandrel outer shaft 101 and is arranged outside the winding drum shaft 2. The outer diameters of the positioning shaft 3, the spool outer shaft 201 and the positioning core outer shaft 101 are basically approximately the same, and the stepped arrangement of the spool shaft 2 and the positioning core shaft 1 can also play a certain role in axially positioning the positioning shaft 3, the spool shaft 2 and the positioning core shaft 1. A circlip 4 for axially positioning the first face gear 10, the second face gear 11, and the third face gear 12 is fitted to the positioning core inner shaft 102.
To ensure flexible rotation of the mandrel shaft 2 relative to the positioning shaft 3 and the positioning mandrel 1, there is a clearance fit between the mandrel shaft 202 and the positioning shaft 3 and between the positioning mandrel shaft 102 and the mandrel shaft 2. The positioning shaft 3 and the positioning core outer shaft 101 are fixed by direct contact with the through holes on the body, and in order to be firm enough after the invention is mounted on the body, appropriate taper or raised stripes or the like are added on the outer peripheral surfaces of the positioning shaft 3 and the positioning core outer shaft 101 to increase friction force in the embodiment.
The specific transmission mechanism and transmission principle of the invention are as follows: the first face gear 10 is coaxially fixed to the positioning shaft 3 at the end opposite to the roll outer shaft 201 and the positioning core outer shaft 101, the second face gear 11 is coaxially fixed to the end opposite to the roll outer shaft 201 of the roll inner shaft 202, and the third face gear 12 is coaxially fixed to the end opposite to the positioning core outer shaft 101 of the positioning core inner shaft 102. The second face gear 11 is rotatably sleeved in the first face gear 10, the third face gear 12 is rotatably sleeved in the second face gear 11, the number of teeth of the first face gear 10 is the same as that of the third face gear 12, and the number of teeth of the second face gear 11 is different from that of the first face gear 10 and the third face gear 12. The one end that is equipped with first face gear 10 on location axle 3 still is equipped with can be with location axle 3 central axis pivoted knob lid 8, is equipped with the pivot 7 of perpendicular to location axle 3 central axis in knob lid 8, and the one end of pivot 7 is equipped with simultaneously with first face gear 10, second face gear 11 and the planetary gear 9 of the all meshing connection of third face gear 12, planetary gear 9 meshes with three face gears simultaneously, has both improved damping ratio and has increased stability.
The planetary gears 9 are rotated around the central axes of the third face gear 12 and the first face gear 10 in a fixed state by rotating the knob cover 8. And the second face gear 11 is driven to rotate slightly through meshing transmission, and then the drum shaft 2 is driven to rotate for string adjustment.
The number of teeth of the third face gear 12 is set to be the same as the number of teeth of the first face gear 10, and isThe number of teeth of the second face gear 11 is +.>. Number of teeth->、/>The magnitude relation influences the rotation direction of the spool shaft 2, but it is noted that +.>And->The difference in values cannot be too great to avoid the phenomenon that the second face gear 11 cannot mesh with the planetary gear 9.
Wherein the third face gear 12 and the first face gear 10 are completely the same in function and are stationary. Only the third face gear 12 is taken out here for analysis of the transmission principle:
let the rotation angle of the knob cover 8 be recorded asThe rotation angle of the second face gear 11 is marked +.>. The transmission mechanism is actually a planetary gear train consisting of a face gear and a planetary gear 9. The rotation angle relationship between the knob cover 8 and the second face gear 11 is as follows: />。
In this embodiment, take，/>The following formula is introduced: />. In this way, when the planetary gear 9 rotates around the third face gear 12 for one circle, the second face gear 11 rotates for 39.6 degrees, namely, the knob cover 8 rotates for 9 circles, and the drum shaft 2 rotates for 1 circle, so that the invention can provide a large enough reduction ratio, and further can accurately tune the strings to meet the actual working requirements.
The knob cover 8 in this embodiment includes a first half knob 801 and a second half knob 802 fixedly connected by bolts and symmetrically distributed centering on the center axis of the positioning shaft 3. Blind holes for respectively rotating and matching two ends of the rotating shaft 7, positioning pins 803 for mutually matching and installing the first half knob 801 and the second half knob 802 and corresponding pin holes are correspondingly formed on opposite surfaces of the first half knob 801 and the second half knob 802. An annular chute 6 is circumferentially arranged on the positioning shaft 3 near the end provided with the first face gear 10, and convex rings 5 which are mutually engaged and are used for matching with the annular chute 6 are arranged on the inner edges of the first half knob 801 and the second half knob 802. On one hand, the matching of the convex ring 5 and the annular chute 6 can play the role of axial positioning; on the other hand, in the assembly, materials such as plastic mats with large damping ratio can be stuck in the annular chute 6, so that the damping ratio is increased, and the strings are prevented from loosening along with the service time after being adjusted and qualified.
The planetary gear 9 is a straight-tooth cylindrical gear and is made of metal materials together with the first face gear 10, the second face gear 11 and the third face gear 12, so that the planetary gear 9 has no axial force, the simple support can be further adapted to a narrow space, the weight of the whole fine adjustment mechanism is reduced, and the simple and compact mechanism is ensured. The planetary gears 9 are simultaneously engaged with the three face gears after the completion of the assembly, and an appropriate amount of jelly is coated on the engagement portions to increase the damping ratio.
Claims (6)
1. A string fine tuning through face gear planetary drive's musical instrument string, its characterized in that: the device comprises a spool shaft (2), a positioning shaft (3) rotatably sleeved outside the spool shaft (2) and a positioning mandrel (1) rotatably sleeved in the spool shaft (2), wherein the spool shaft (2) comprises a spool inner shaft (202) which is matched and installed in the positioning shaft (3) and a spool outer shaft (201) which is arranged outside the positioning shaft (3) and used for winding strings, a hole used for fixing the strings is formed in the spool outer shaft (201), and the positioning mandrel (1) comprises a positioning mandrel inner shaft (102) which is matched and installed in the spool shaft (2) and a positioning mandrel outer shaft (101) which is arranged outside the spool shaft (2); a first face gear (10) is coaxially and fixedly arranged at one end, opposite to the reel outer shaft (201), of the positioning shaft (3) and one end, opposite to the reel outer shaft (101), of the positioning core outer shaft (101), a second face gear (11) is coaxially and fixedly arranged at one end, opposite to the reel outer shaft (201), of the reel inner shaft (202), a third face gear (12) is coaxially and fixedly arranged at one end, opposite to the positioning core outer shaft (101), of the positioning core inner shaft (102), the second face gear (11) is rotatably sleeved in the first face gear (10), the third face gear (12) is rotatably sleeved in the second face gear (11), the number of teeth of the first face gear (10) is the same as that of the third face gear (12), and the number of teeth of the second face gear (11) is different from that of the first face gear (10) and the third face gear (12); one end of the positioning shaft (3) is provided with a first face gear (10), a knob cover (8) capable of rotating along the central axis of the positioning shaft (3), a rotating shaft (7) perpendicular to the central axis of the positioning shaft (3) is arranged in the knob cover (8), and one end of the rotating shaft (7) is provided with a planetary gear (9) which is meshed and connected with the first face gear (10), the second face gear (11) and the third face gear (12) simultaneously;
an annular chute (6) is arranged on the positioning shaft (3) along the circumferential direction, a convex ring (5) which is used for being matched with the annular chute (6) is arranged at the inner edge of the knob cover (8), and a plastic pad which is used for increasing the rotation resistance of the knob cover (8) is arranged in the annular chute (6);
the planetary gear (9) is a straight-tooth cylindrical gear and is made of metal materials together with the first face gear (10), the second face gear (11) and the third face gear (12), and convex stripes for increasing friction force with the body are respectively arranged on the peripheries of the positioning shaft (3) and the positioning core outer shaft (101);
the spool shaft (2) and the positioning mandrel (1) are of a step shape and comprise a large-diameter section and a small-diameter section which are coaxially connected, the small-diameter section of the spool shaft (2) is a spool inner shaft (202) and is matched with the spool inner shaft to be installed in the positioning shaft (3), the large-diameter section of the spool shaft (2) is a spool outer shaft (201) and is arranged outside the positioning shaft (3) and used for winding strings, 1-2 holes used for fixing the strings are formed in the spool outer shaft (201), the small-diameter section of the positioning mandrel (1) is a positioning mandrel inner shaft (102) and is matched with the positioning mandrel inner shaft (102), and the large-diameter section of the positioning mandrel (1) is a positioning mandrel outer shaft (101) and is arranged outside the spool shaft (2).
2. The string trimmer of claim 1, wherein: the knob cover (8) comprises a first half knob (801) and a second half knob (802) which are fixedly connected through bolts and symmetrically distributed by taking the central axis of the positioning shaft (3) as the center, and blind holes for respectively rotating and matching the two ends of the rotating shaft (7) are correspondingly formed on the opposite surfaces of the first half knob (801) and the second half knob (802).
3. The string trimmer of claim 1, wherein: and positioning pins (803) and corresponding pin holes for mutually matched installation are correspondingly formed on opposite surfaces of the first half knob (801) and the second half knob (802).
4. The string trimmer of claim 1, wherein: a circlip (4) for axially positioning the first face gear (10), the second face gear (11) and the third face gear (12) is fitted and mounted on the positioning core inner shaft (102).
5. The string trimmer of claim 1, wherein: the inner roll shaft (202) and the positioning shaft (3) and the inner positioning core shaft (102) and the spool shaft (2) are in clearance fit.
6. The string trimmer of claim 1, wherein: gum for increasing the damping ratio is respectively arranged at the meshing positions of the planetary gear (9) and the first face gear (10), the second face gear (11) and the third face gear (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594302.4A CN108510967B (en) | 2018-06-11 | 2018-06-11 | String fine-tuning through face gear planetary transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594302.4A CN108510967B (en) | 2018-06-11 | 2018-06-11 | String fine-tuning through face gear planetary transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108510967A CN108510967A (en) | 2018-09-07 |
| CN108510967B true CN108510967B (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810594302.4A Active CN108510967B (en) | 2018-06-11 | 2018-06-11 | String fine-tuning through face gear planetary transmission |
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| Country | Link |
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| CN (1) | CN108510967B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473083B (en) * | 2018-11-27 | 2023-12-19 | 河南科技大学 | String fine-tuning mechanism driven by planetary gear with small tooth difference |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201126701Y (en) * | 2007-11-20 | 2008-10-01 | 李大鉴 | Bowstring-adjusting machine for guitar |
| CN202957028U (en) * | 2012-09-18 | 2013-05-29 | 成都新海星文化传播有限公司 | String fine tuning device |
| CN103514793A (en) * | 2013-09-03 | 2014-01-15 | 无锡商业职业技术学院 | Bevel gear mechanical drive model for teaching |
| CN108053812A (en) * | 2018-02-12 | 2018-05-18 | 周德柱 | For violin and the fine-tuning peg of plucked instrument |
| CN208368138U (en) * | 2018-06-11 | 2019-01-11 | 洛阳金衢工贸有限公司 | A kind of string micro-adjusting mechanism by face gear Gear Planet Transmission |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007054312B4 (en) * | 2007-11-05 | 2019-08-29 | Wittner Gmbh & Co.Kg | Fine tuning peg |
-
2018
- 2018-06-11 CN CN201810594302.4A patent/CN108510967B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201126701Y (en) * | 2007-11-20 | 2008-10-01 | 李大鉴 | Bowstring-adjusting machine for guitar |
| CN202957028U (en) * | 2012-09-18 | 2013-05-29 | 成都新海星文化传播有限公司 | String fine tuning device |
| CN103514793A (en) * | 2013-09-03 | 2014-01-15 | 无锡商业职业技术学院 | Bevel gear mechanical drive model for teaching |
| CN108053812A (en) * | 2018-02-12 | 2018-05-18 | 周德柱 | For violin and the fine-tuning peg of plucked instrument |
| CN208368138U (en) * | 2018-06-11 | 2019-01-11 | 洛阳金衢工贸有限公司 | A kind of string micro-adjusting mechanism by face gear Gear Planet Transmission |
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| CN108510967A (en) | 2018-09-07 |
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