CN1479026A - Mechanical stepless speed variator - Google Patents
Mechanical stepless speed variator Download PDFInfo
- Publication number
- CN1479026A CN1479026A CNA031332161A CN03133216A CN1479026A CN 1479026 A CN1479026 A CN 1479026A CN A031332161 A CNA031332161 A CN A031332161A CN 03133216 A CN03133216 A CN 03133216A CN 1479026 A CN1479026 A CN 1479026A
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- gear
- screw thread
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- transmission
- gear device
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Abstract
A stepless mechanical speed variator features use of a non-complete gear unit whose active drive radius is used to vary speed. Said non-complete gear unit has a screwed conic body, which can rotate to force the engaged teeth to slide along the conic body, so changing its active drive radium.
Description
Technical field
The present invention relates to a kind of by gear-driven mechanical stepless transmission.
Background technique
Present stepless speed variator mainly contains fluid torque converter and mechanical stepless transmission.Fluid torque converter has the ability of stepless continuous speed change and bending moment, and external loading is had good adjusting and conformability.But have problems from the economic point of view: its highest transmission efficiency is not too high, and efficient transmission range is also little; Torque conversion range is also limited; And complex structure own, the cost height.The mechanical stepless transmission kind is more, but all is to adopt friction or friction and the comprehensive transmission of engagement basically, so efficient is low, transmitted power is also very limited.Develop into belt transmission by the bicone ball that occurs decades ago, dish, ring cylinder etc., always since friction factor and part bear the unit pressure restriction, the problem of technology and control in addition can not be transmitted bigger power, efficient is low; At present because the driving belt improvement of Manufacturing Technology, the performance of the steel band stepless speed variator of particulate metal manufacturing improves, but the shortcoming of skidding when having high-power transmission, efficient is not high yet; The stepless speed variator of sprocket driving similarly.Efficiently, handiness, to transmit powerful mechanical stepless transmission be the target that people pursue always, but the progress of making a breakthrough property never.
Summary of the invention
The purpose of this invention is to provide a kind of efficient height, the scope of high-power, speed change and bending moment can transmitted is big and the mechanical stepless transmission of handiness.
But mechanical stepless transmission of the present invention has an effective transmission radius continually varying partial gear device.This device has a threaded cone, be buckled with row's gear teeth on the screw thread, when the outer interplanting of cone and its relatively rotates, force to be buckled in one on the screw thread and to arrange the gear teeth and between pyramidal big end and small end, slide along screw thread, change effective transmission radius of this partial gear device with this.Several gear actings in conjunction of this partial gear device and its periphery realize continuous and continual transmission.
Owing to adopt gear transmission, thereby make the efficient of this stepless speed variator can be suitable with the efficient of manual gear formula step change transmission.Owing to adopt gear transmission, there is not the shortcoming of transmission slip in this stepless speed variator again, therefore can transmit high-power.Can realize stepless change as long as this stepless speed variator relatively rotates cone and its outer interplanting, therefore exist again and handle advantage very convenient, that easily be automated especially.
Description of drawings
Fig. 1 is that the axle of an embodiment of the present invention is surveyed schematic representation.
Fig. 2 is the cross-sectional schematic of Fig. 1 key position.
Fig. 3 is the cross sectional representation of another embodiment of the present invention.
Embodiment
In conjunction with Fig. 1 and Fig. 2 embodiment of this mechanical stepless transmission is described.Screw thread 2 is arranged on the cone 1, detaining a row on the screw thread 2 can be along the gear teeth 3 (though any one section screw thread 2 all is not parallel to pyramidal cross section and any one section screw thread 2 projection on cross section is not a segment standard circular arc, the gear teeth 3 can be made the one section circular arc that is parallel to cross section and standard) of screw thread 2 slips.When cone 1 and its overcoat 4 relatively rotate, force the gear teeth 3 on screw thread 2, to slide, make the position of the gear teeth 3 between cone 1 big end and small end change, thereby make the gear teeth 3 place radius of a circles produce respective change, change effective transmission radius with this.The effect that overcoat 4 keeps each gear teeth 3 closely to link to each other all the time in addition.In fact, but the integral body that cone 1, screw thread 2, the gear teeth 3 and overcoat 4 constitute can be regarded an effective transmission radius continually varying partial gear as.When the gear teeth 3 are positioned at the end of cone 1 small end, effective transmission radius minimum of this partial gear; When the gear teeth 3 do not have screw thread 2 by small end in the process that big end slides gradually, it is big that effective transmission radius of this partial gear also correspondingly becomes gradually; When the gear teeth 3 are positioned at the end of cone 1 big end, effective transmission radius maximum of this partial gear.
As middle drive wheel, this partial gear device need just can make transmission continuously and uninterruptedly with several gear actings in conjunction of periphery.Equally distributed peripheral gear shown in Figure 1 is two (gear 5 and gears 6), in this case the arc length that forms of the gear teeth 3 must not could guarantee less than the circumference of half correspondence the gear teeth 3 all the time can with gear 5, gear 6 at least one be meshed (as shown in Figure 2), the transmission work that so just can make the whole speed changer that comprises gear 7, gear 8, gear 9, gear 10 and gear 11 is continuous and uninterruptedly.
Effective transmission radius of this partial gear device hour, the gear teeth can form a circumference; The peripheral gear of partial gear device shown in Figure 1 is two, so the effective transmission radius of partial gear device when maximum the gear teeth can form circumference half; Because the arc length that the gear teeth form equates all the time, can equal 2 so be not difficult to find out the maximum gear ratio of stepless speed variator shown in Figure 1.In actual design,, be not difficult to draw: R as long as change the maximum gear ratio that the peripheral gear number of this partial gear device just can change this stepless speed variator on demand
b=N, R
bBe maximum gear ratio, N is the number of gears that is uniformly distributed in partial gear device periphery.
Need remark additionally, when effective transmission radius of partial gear device changed, gear 5 and gear 6 should be able to be made simultaneously and be opened accordingly or draw action in, and this obviously is easy to realize; Also have, in effective transmission radius continually varying process of partial gear device, the situation of tooth pitch integral multiple can appear not being in the circumference at the gear teeth 3 places inevitably, corresponding measure is to make gear 5 and gear 6 with their axles separately certain degrees of freedom that relatively rotates be arranged, and reset with spring or shell fragment, perhaps gear 5 and gear 6 are made the free wheel device with ratchet mechanism; In addition, when the intermittent gearing mechanism transmission, enter engagement smoothly and do not collide normal the need the suitably reduction of first tooth tooth top do with adjacent tooth tooth top in order to guarantee first tooth; Have, for increasing soundness and reliability, raising working strength, each gear teeth 3 can or be taked other measure with bearing pin and carrier bar binding again; Also can take is increasing suitable rolling element, is making the sliding friction between the gear teeth and the screw thread become the mode of rolling friction to improve the performance of this stepless speed variator between the gear teeth and the screw thread.
Fig. 3 is the cross sectional representation of another embodiment of the present invention, and gear 12 is equivalent to gear 9, gear 10 and the gear 11 among Fig. 1.
Certainly, the gear teeth 3 also can adopt other form, for example adopt roller shape or other form of the gear pin shape or the roller chain of pinwheel, and this moment, gear 5 and gear 6 should adopt corresponding cycloid wheel or sprocket wheel or other shape.The variation among a small circle of tooth top distance in the time of so also can avoiding effective transmission radius because of the gear teeth 3 to change.The partial gear device also can directly be simplified to the cone gear that the space width of a big end and small end equates, its peripheral gear it big end and small end between also can reach infinite variable speed purpose during slip.But because its big end and the space width of small end equate that this just makes each gear teeth and circular cone axle center not in same plane (except the special circumstances), therefore the peripheral gears that meshes with its just is very limited, such as not doing too thickly etc.In like manner, the partial gear device also can directly be simplified to a pinwheel and groove shape or other shape.These all drop within protection scope of the present invention.
Claims (3)
1, a kind of mechanical stepless transmission, reach the speed change purpose by the effective transmission radius of drive wheel in the middle of changing it, it is characterized in that: but drive wheel is an effective transmission radius continually varying partial gear device in the middle of this, this partial gear device has a cone (1) with screw thread (2), be buckled with row's gear teeth (3) on the screw thread (2), when cone (1) and its overcoat (4) when relatively rotating, force and be buckled in one on the screw thread (2) the row gear teeth (3) and between the big end of cone (1) and small end, slide along screw thread (2), change effective transmission radius of this partial gear device with this, several gear actings in conjunction of this partial gear device and its periphery realize continuous and continual transmission.
2, mechanical stepless transmission according to claim 1 is characterized in that the gear teeth (3) adopt gear pin shape or roller shape.
3, mechanical stepless transmission according to claim 1 is characterized in that the partial gear device directly is simplified to equal cone gear, pinwheel, roller wheel and the groove shape of space width of a big end and small end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031332161A CN1479026A (en) | 2003-07-20 | 2003-07-20 | Mechanical stepless speed variator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031332161A CN1479026A (en) | 2003-07-20 | 2003-07-20 | Mechanical stepless speed variator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1479026A true CN1479026A (en) | 2004-03-03 |
Family
ID=34154226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031332161A Pending CN1479026A (en) | 2003-07-20 | 2003-07-20 | Mechanical stepless speed variator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1479026A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559357A (en) * | 2022-03-26 | 2022-05-31 | 徐德富 | Single-driven revolution and rotation polishing and shape-modifying device |
-
2003
- 2003-07-20 CN CNA031332161A patent/CN1479026A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559357A (en) * | 2022-03-26 | 2022-05-31 | 徐德富 | Single-driven revolution and rotation polishing and shape-modifying device |
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| DD01 | Delivery of document by public notice |
Addressee: Peng Shengzhang Document name: Deemed as a notice of withdrawal |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |