CN103089967A - Variable transmission ratio gear drive mechanism - Google Patents

Variable transmission ratio gear drive mechanism Download PDF

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Publication number
CN103089967A
CN103089967A CN2013100305081A CN201310030508A CN103089967A CN 103089967 A CN103089967 A CN 103089967A CN 2013100305081 A CN2013100305081 A CN 2013100305081A CN 201310030508 A CN201310030508 A CN 201310030508A CN 103089967 A CN103089967 A CN 103089967A
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CN
China
Prior art keywords
double wedge
gear
tooth
recessed
small gear
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Granted
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CN2013100305081A
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Chinese (zh)
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CN103089967B (en
Inventor
王丰
赵丽婷
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Application filed by Nanjing University of Aeronautics and Astronautics filed Critical Nanjing University of Aeronautics and Astronautics
Priority to CN201310030508.1A priority Critical patent/CN103089967B/en
Publication of CN103089967A publication Critical patent/CN103089967A/en
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Publication of CN103089967B publication Critical patent/CN103089967B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a variable transmission ratio gear drive mechanism which comprises a concave tooth surface gear and a small gear. The concave tooth surface gear is mutually meshed with the small gear which is provided with convex teeth. The concave tooth surface gear is provided with more than two circles of concave teeth which are uniformly arranged along the peripheral direction and matched with the convex teeth. The variable transmission ratio gear drive mechanism is simple in structure and easy to achieve, and does not need complex equipment. Speed change can be achieved as long as the small gear is meshed with different concave circles on the concave tooth surface gear.

Description

A kind of gear drive of variable gear ratio
Technical field
The present invention relates to a kind of gear drive, be specifically related to a kind of gear drive of variable gear ratio.
Background technique
The existing gear number of teeth is constant, realize that speed change needs the gear of a lot of different numbers of teeth, so just needs heavier and complicated equipment.And present mechanical continuously-variable transmission structure is just more complicated, and transmission efficiency is lower.
Summary of the invention
It is little that the technical problem to be solved in the present invention is to provide a kind of volume, simple in structure, and just can change the gear drive of velocity ratio by a pair of gear.
In order to solve the problems of the technologies described above, the gear drive of a kind of variable gear ratio that the present invention uses, comprise recessed flank of tooth gear, small gear, recessed flank of tooth gear and small gear are intermeshing, double wedge is arranged on small gear, the above along the circumferential direction evenly distributed recessed tooth that matches with double wedge of two circles is arranged on recessed flank of tooth gear.The above along the circumferential direction evenly distributed recessed tooth of two circles is arranged on recessed flank of tooth gear, because the calibration radius of a circle of each circle recessed tooth position is different, the velocity ratio when the recessed tooth that the velocity ratio in the time of can knowing recessed tooth engagement on small gear and first lap according to common practise and small gear enclose with second meshes is different.This programme has simple in structure, is easy to realize, does not need complicated equipment, as long as recessed circles different on small gear and recessed flank of tooth gear is meshed, just can realize speed change.
Further improvement as the technical program, small gear comprises mounting plate, double wedge structure, double wedge, the along the circumferential direction evenly distributed double wedge structure that matches with recessed tooth is arranged on mounting plate, and double wedge is arranged on the double wedge structure, and the double wedge structure can change the double wedge tooth top to the distance at small gear center.owing to having adopted the shaggy tooth structure driven, small gear is when moving to the second recessed tooth engagement of circle with the engagement of the recessed tooth of first lap, double wedge must first shift out from the recessed tooth of first lap, and the gear transmission between general concurrent aces, distance between concurrent aces is constant, the flank of tooth of recessed flank of tooth gear is also constant to the distance at small gear center, and the tooth top of small gear is also constant to the distance at small gear center, thereby double wedge can not be extracted from recessed tooth, for this reason, having adopted in this programme and having made pinion head is the scheme that can change to the distance at small gear center, when using external force that double wedge is shifted out recessed tooth from first lap, transmission shaft do not change in the radial direction between recessed flank of tooth gear and transmission shaft apart from situation, change the double wedge tooth top to the distance at small gear center, double wedge is shifted out from the recessed tooth of first lap smoothly.This programme can be the characteristics of the on-stream direct change velocity ratio of gear, and is very convenient.
As the further improvement of the technical program, described double wedge structure comprises double wedge fixed plate, double wedge rotating shaft; The double wedge fixed plate is comprised of two fixed plates, and the double wedge fixed plate is fixedly mounted on mounting plate; Two fixed plates have the hole on corresponding position, and the double wedge rotating shaft is fixedly mounted on two fixed plates; Have through hole on double wedge, double wedge is set in the double wedge rotating shaft by through hole.Gapped between double wedge and mounting plate, the size in gap can guarantee that double wedge encloses to another from a circle slippage smoothly on the recessed flank of tooth.Changing the double wedge tooth top is a lot of to the scheme of the distance at small gear center, as the lateral opening hole at cylindrical mounting plate, built-in spring in the hole, one end of spring is fixedly mounted on the bottom, hole, the other end is fixedly mounted on the root of double wedge, the part of the close tooth root of double wedge is positioned at the hole, and this double wedge structure also can change the double wedge tooth top to the distance at small gear center.Adopt double wedge to change the double wedge tooth top to the distance at small gear center around the method for double wedge rotating shaft rotation in this programme, this method is very simple, and is convenient.Gapped between double wedge and mounting plate, be in order to make the double wedge rotation of having living space when the double wedge rotating shaft is rotated.
As the further improvement of the technical program, through hole is positioned at the bottom of double wedge.Its objective is that the amplitude of double wedge tooth top skew is larger, thereby makes the double wedge tooth top larger to the change of small gear centre distance in order to make double wedge when the double wedge rotating shaft is rotated.
As the further improvement of the technical program, small gear also comprises cover plate, and cover plate is fixedly mounted on the opposite side of double wedge structure, and is gapped between double wedge and cover plate, and the size in gap can guarantee that double wedge encloses to another from a circle slippage smoothly on the recessed flank of tooth.All adopt plate to cover in this programme crowned tooth structure two sides, effectively avoided foreign material to enter in the double wedge structure.Simultaneously, due to the gapped normal movement that has guaranteed double wedge between double wedge and cover plate.
Further improvement as the technical program, small gear also comprises the first spring and the second spring, and an end of the first spring is arranged on mounting plate, and the other end is arranged on the below of through hole, one end of the second spring is installed on the cover board, and the other end is arranged on the below of through hole.In this programme, skew after moving, double wedge has occured, and under the effect of spring, double wedge is promptly resetted.
As the further improvement of the technical program, the gear teeth on double wedge top are the solid of rotation take the small gear radial direction as axis, and recessed tooth is the solid of rotation corresponding with double wedge.The design of rotary structure is can mesh well for gear.
As the further improvement of the technical program, recessed tooth can be through hole or blind hole.Not being gear on ordinary meaning at this programme concave tooth, can be blind hole, therefore, processes very convenient; Recessed tooth can be also through hole, and the processing of through hole is also very easily, and this structure can make recessed flank of tooth gear can also use another side in one side after being worn, and has extended recessed flank of tooth service life of gear.
Description of drawings
Fig. 1 is the gear drive schematic diagram of variable gear ratio.
Fig. 2 is recessed flank of tooth gear schematic diagram.
Fig. 3 is the small gear schematic diagram.
Fig. 4 is small gear double wedge structural representation.
Fig. 5 is small gear cover plate figure.
Fig. 6 is the single double wedge schematic diagram of small gear.
Fig. 7 is small gear double wedge schematic diagram.
Number in the figure title: 1, recessed flank of tooth gear, 2, recessed tooth, 3, small gear, 4, double wedge, 5, mounting plate, 6, recessed tooth fixed plate, 7, double wedge rotating shaft, the 8, first spring, the 9, second spring, 10, double wedge structure, 11, double wedge auxiliary fixing plate, 12, panel, 13, cover plate, 14, through hole, 15, double wedge fixed plate stiffening rib.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in more detail.
For sake of convenience, hereinafter alleged " on " upper and lower of D score and accompanying drawing itself is to consistent, but structure of the present invention do not played the restriction effect.Calling the recessed tooth of first lap by a paracentral recessed tooth of circle on recessed flank of tooth gear, and radially outwards be called second the circle, the 3rd the circle, the 4th the circle, the 5th circle, the spring that is arranged on mounting plate one side is called the first spring, and the spring that is arranged on cover plate one side is called the second spring.
Fig. 1 is the schematic diagram of the gear drive of variable gear ratio.Recessed flank of tooth gear 1 and small gear 3 are intermeshing.Along the circumferential direction evenly distributed recessed tooth 2 of multi-turn is arranged on recessed flank of tooth gear 1, adopted the five evenly distributed recessed teeth 2 of circle in the present embodiment, need at least to have the two recessed teeth 2 of circle in order to implement speed change, the number of turns of recessed tooth 2 can be come to determine as required.
Small gear 3 comprises mounting plate 5, the first spring 8, the second spring 9, cover plate 13, the double wedge structure 10 and the double wedge 4 that match with recessed tooth 2 as shown in Fig. 2,3,4,5,6,7, and double wedge structure 10 is along the circumferential direction evenly distributed, and mounting plate 5 is cylindrical.Crowned tooth structure 10 of the present invention is fixedly mounted on the edge of cylindrical mounting plate 5 one sides, in fact on two of mounting plate and side, double wedge structure 10 can be installed.Double wedge 4 is arranged on double wedge structure 10.Double wedge structure 10 comprises double wedge fixed plate 6, double wedge rotating shaft 7, double wedge fixed plate stiffening rib 15.Double wedge fixed plate 6 comprises two fixed plates, and double wedge fixed plate 6 is fixedly mounted on mounting plate 5, and a side of double wedge fixed plate 6 is positioned at the edge of cylindrical mounting plate 5.The middle part of two fixed plates that match has the hole, and double wedge rotating shaft 7 is passed the hole of opening on two fixed plates that match and is arranged on double wedge fixed plate 6.Have through hole 14 on double wedge 4, through hole 14 preferably is positioned at double wedge 4 near on the position of bottom, and double wedge 4 is set in double wedge rotating shaft 7 by through hole 14.The bottom of double wedge 4 is cuboid, and the top of double wedge 4 is gear teeth structure, and is gapped between double wedge 4 and mounting plate 5, and the size in gap can guarantee that double wedge 14 encloses to another from a circle slippage smoothly on the recessed flank of tooth.Cover plate 13 comprises double wedge auxiliary fixing plate 11 and the panel 12 corresponding with double wedge fixed plate 6, double wedge auxiliary fixing plate 11 comprises two auxiliary fixing plates that match, cover plate 13 is fixedly mounted on the opposite side of double wedge structure 10, the purpose that double wedge auxiliary fixing plate 11 is installed is exactly gapped in order to make between double wedge 4 and cover plate 13, and playing the effect of reinforcing double wedge structure 10, the size of this gap can guarantee that double wedge 14 encloses to another from a circle slippage smoothly on the recessed flank of tooth.One end of the first spring 8 is arranged on mounting plate 5, and the other end is arranged on the position of close tooth root section of double wedge 4, and an end of the second spring 9 is arranged on cover plate 13, and the other end is arranged on the position of close tooth root section of double wedge 4.Double wedge fixed plate stiffening rib 15 1 ends are fixedly mounted on mounting plate 5, and the other end is fixedly mounted on double wedge fixed plate 6, its objective is in order to strengthen the intensity of double wedge fixed plate 6.Change the double wedge tooth top to the distance at small gear center by double wedge 4 around double wedge rotating shaft 7 rotations in the present embodiment, also can realize this purpose by other other modes of known mode.For double wedge 4 and recessed tooth 2 can well be meshed, the gear teeth on double wedge 4 tops are solid of rotation, and the gear teeth sectional profile curve lin on double wedge 4 tops can adopt known various curves according to different requirements, as involute etc.Curved surfaces in recessed tooth 2 are turning surface, and the profilogram of the inner section of recessed tooth 2 can adopt the tooth curve that matches with the gear teeth cross section on double wedge 4 tops, and recessed tooth 2 can be through hole or blind hole, and the diameter of recessed tooth 2 is determined according to double wedge 4.The radius r of recessed tooth 2 each circle determines according to n*P=2 π r, and n is the number of same circle concave tooth 2, and P is the tooth pitch between adjacent two gear homonymy flank profils in same circle.When small gear 3 moves vertically, double wedge 4 has reduced the distance of double wedge 4 tooth tops to the small gear center around double wedge rotating shaft 7 rotations, make small gear be transitioned into smoothly another circle from a circle, at another circle medi-spring, double wedge is resetted, recessed tooth with another circle meshes smoothly, thereby reaches the purpose that changes speed ratio.

Claims (8)

1. the gear drive of a variable gear ratio, comprise recessed flank of tooth gear (1), small gear (3), recessed flank of tooth gear (1) and small gear (3) are intermeshing, it is characterized in that: small gear (3) has double wedge (4), and recessed flank of tooth gear (1) has the above along the circumferential direction evenly distributed recessed tooth (2) that matches with double wedge (4) of two circles.
2. gear drive according to claim 1, it is characterized in that: small gear (3) comprises mounting plate (5), double wedge structure (10), double wedge (4), the along the circumferential direction evenly distributed double wedge structure (10) that matches with recessed tooth (2) is arranged on mounting plate (5), double wedge (4) is arranged on double wedge structure (10), and double wedge structure (10) can change double wedge (4) tooth top to the distance at small gear center.
3. gear drive according to claim 2, it is characterized in that: described double wedge structure (10) comprises double wedge fixed plate (6), double wedge rotating shaft (7); Double wedge fixed plate (6) is fixedly mounted on mounting plate (5); Double wedge rotating shaft (7) is fixedly mounted on double wedge fixed plate (6); Have through hole (14) on double wedge (4), double wedge (4) is set in double wedge rotating shaft (7) by through hole (14).
4. gear drive according to claim 3, it is characterized in that: through hole (14) is positioned at the bottom of double wedge (4).
5. one of according to claim 2-4 described gear drives, it is characterized in that: small gear (3) also comprises cover plate (13), cover plate (13) is fixedly mounted on the opposite side of double wedge structure (10).
6. gear drive according to claim 5, it is characterized in that: small gear (3) also comprises the first spring (8) and the second spring (9), one end of the first spring (8) is arranged on mounting plate (5), the other end is arranged on the below of through hole (14), one end of the second spring (9) is arranged on cover plate (13), and the other end is arranged on the below of through hole (14).
7. one of according to claim 1-4 described gear drives is characterized in that: the gear teeth on double wedge (4) top are the solid of rotation take small gear (3) radial direction as axis, and recessed tooth (2) is the solid of rotation corresponding with double wedge (4).
8. one of according to claim 1-4 described gear drives, it is characterized in that: recessed tooth (2) can be through hole or blind hole.
CN201310030508.1A 2013-01-28 2013-01-28 A kind of gear drive of variable gear ratio Expired - Fee Related CN103089967B (en)

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Application Number Priority Date Filing Date Title
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CN103089967B CN103089967B (en) 2015-08-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107906172A (en) * 2017-11-16 2018-04-13 东莞市松研智达工业设计有限公司 A kind of gear drive reduced with speed increase gearratio
EP3730395A1 (en) * 2019-04-22 2020-10-28 CeramicSpeed Sport A/S A gear shifting system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033850A (en) * 1935-07-23 1936-03-10 Cen Tennial Cotton Gin Co Speed changing mechanism for cotton gin feeders and the like
CN2273359Y (en) * 1996-09-09 1998-01-28 秦汝魁 Honeycomb type gear infinitely variable speeds mechanism
CN2384035Y (en) * 1999-07-05 2000-06-21 鲁觉海 Gear speed variator
US6158296A (en) * 1995-12-08 2000-12-12 Denance; Raymond Transmission with structurally simplified gear ratio
CN203146758U (en) * 2013-01-28 2013-08-21 南京航空航天大学 Gear transmission mechanism with variable transmission ratio

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033850A (en) * 1935-07-23 1936-03-10 Cen Tennial Cotton Gin Co Speed changing mechanism for cotton gin feeders and the like
US6158296A (en) * 1995-12-08 2000-12-12 Denance; Raymond Transmission with structurally simplified gear ratio
CN2273359Y (en) * 1996-09-09 1998-01-28 秦汝魁 Honeycomb type gear infinitely variable speeds mechanism
CN2384035Y (en) * 1999-07-05 2000-06-21 鲁觉海 Gear speed variator
CN203146758U (en) * 2013-01-28 2013-08-21 南京航空航天大学 Gear transmission mechanism with variable transmission ratio

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107906172A (en) * 2017-11-16 2018-04-13 东莞市松研智达工业设计有限公司 A kind of gear drive reduced with speed increase gearratio
EP3730395A1 (en) * 2019-04-22 2020-10-28 CeramicSpeed Sport A/S A gear shifting system

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Granted publication date: 20150812

Termination date: 20210128