CN107339385B - Spin-free single-ring disc type stepless speed change unit - Google Patents
Spin-free single-ring disc type stepless speed change unit Download PDFInfo
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- CN107339385B CN107339385B CN201610929317.2A CN201610929317A CN107339385B CN 107339385 B CN107339385 B CN 107339385B CN 201610929317 A CN201610929317 A CN 201610929317A CN 107339385 B CN107339385 B CN 107339385B
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- 230000005540 biological transmission Effects 0.000 description 41
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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Classifications
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- 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
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
Abstract
The invention discloses a spin-free single-ring disc type stepless speed change unit, and aims to provide a stepless speed change unit capable of avoiding spin efficiency loss in a speed change ratio range. The technical key points are as follows: the speed changing unit consists of an input ring disc, an input shaft, an output ring disc and an output shaft, wherein power is input by the input shaft, is input by the input ring disc and the output ring disc, and is finally output by the output shaft. The bus of the output ring disk is a special curve, the input shaft and the output shaft are staggered at a certain angle, and the included angle is kept unchanged in the speed regulation process. During speed regulation, the input ring disc and the input shaft do profiling motion along the shape of the generatrix of the output ring disc, and the input ring disc and the output ring disc are always kept to be pressed and contacted.
Description
Technical Field
The present invention relates to a transmission unit in a drive train, in particular a traction type continuously variable transmission unit.
Background
Continuously variable transmissions are an ideal mechanical transmission scheme. Because the continuously variable transmission can provide a series of continuous gear ratios so that the vehicle engine is always operating at a high efficiency point, the efficiency of the whole vehicle is improved and the emission of the vehicle is reduced. Various existing mechanical continuously variable transmissions can be mainly divided into: friction type continuously variable transmission and traction type continuously variable transmission. For large displacement internal combustion engine vehicles, the transmission efficiency is higher, typically 75% -90%, and the torque transferred is greater than for friction continuously variable transmissions. Therefore, traction type continuously variable transmissions have been widely paid attention to and studied by the scholars in this field.
The traction type continuously variable transmission mainly refers to a continuously variable transmission which utilizes rolling of a driving element to drive rolling of a driven element to transmit power. The traction type continuously variable transmission unit is a collection of main transmission elements in the traction type continuously variable transmission. The transmission element is rigid, but in the contact place, an oil film is formed in the middle instead of the direct contact of the rigid body to the rigid body, and the oil film is in a solid-like state to transmit a larger shearing force due to the fact that the viscosity of the oil film is increased under pressure.
Efficiency losses for a traction type continuously variable transmission mainly include: spin loss, slip loss, bearing loss, and churning loss. In general, in a traction type continuously variable transmission, the proportion of stirring oil loss and bearing loss is relatively small, and sideslip loss only occurs under the speed change or other special working conditions, while the slip loss is completely generated along with traction transmission, and the slip loss is caused by that an oil film has certain shearing deformation under the action of traction force, and the loss is unavoidable. The spin losses account for a relatively large proportion of the total efficiency losses, typically 40% -60%, relative to the other types of losses, and are more significant when the load on the transmission is small. The term "spin" refers to a case where the speeds of the driving element and the driven element at points in the contact region are not uniform during traction transmission, and this case may cause adverse effects such as efficiency reduction and oil film heating, and eventually affects traction transmission performance.
The prior art has the following defects: the existing traction type continuously variable transmission cannot avoid spin efficiency loss in most working states. Spin losses can only disappear when the rotating shaft of the driving part, the rotating shaft of the driven part and the tangential plane of the traction oil film are parallel to each other or intersect at one point, and spin exists in other traction transmission conditions. It is not difficult to find out that a continuously variable transmission has difficulty in satisfying the relative geometric position requirement of spin-free while ensuring continuous speed regulation. Therefore, existing traction type continuously variable transmission products have spin losses.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a stepless speed change unit capable of avoiding spin efficiency loss in a certain speed change ratio range.
In order to solve the technical problems, the invention adopts the following technical scheme: a spin-free single-ring disc type stepless speed change unit comprises an input ring disc, an input shaft, an output ring disc and an output shaft. The input ring disk is fixedly connected with the input shaft, the input ring disk and the input shaft can rotate around the rotation axis of the input shaft, the output ring disk is fixedly connected with the output shaft, the output ring disk and the output shaft can rotate around the rotation axis of the output shaft, the input ring disk and the output ring disk are tightly pressed and contacted with the traction point, and the input shaft and the output shaft are arranged at a certain angle. The output ring disk busbar on the input ring disk is a curve whose equation satisfies:
the origin O of the coordinate system XOY is on the rotation axis of the output shaft, the X axis is coincident with the rotation axis of the output shaft, R is the distance from the traction point to the rotation axis of the input shaft along the direction perpendicular to the rotation axis of the output shaft, θ is the included angle between the input shaft and the output shaft, and C is a real constant.
The input shaft is provided with a profiling speed regulation disc, the profiling speed regulation disc is provided with a vertical track and a profiling track, the vertical track is vertical to the output shaft, the profiling track is identical to the bus bar of the output ring disc in shape, the input shaft is respectively provided with a sliding block and a roller, the sliding block is provided with a chute for limiting the included angle between the input shaft and the output shaft to be theta, the sliding block is limited in the vertical track and can slide along the vertical track, and the roller is arranged in the profiling track and can slide along the profiling track, so that the input shaft is only required to be driven to move during speed regulation, and the sliding block and the roller are limited in the corresponding tracks, so that the input shaft is actually subjected to profiling motion.
The invention relates to a spin-free single-ring disc type stepless speed change unit, which has the following working principle: during transmission, power is input by the input shaft, the input shaft rotates, the input ring disk is driven to rotate, the input ring disk pulls the output ring disk to rotate, the output ring disk drives the output shaft to rotate together, and the power is output from the output shaft. During speed regulation, the positions of the output ring disc and the output shaft are kept unchanged, the input ring disc and the input shaft do profiling motion along the shape of the generatrix of the output ring disc, the included angle between the input shaft and the output shaft is kept unchanged, and the input ring disc and the output ring disc are always kept in compression and contact. Because the relative position relation of the transmission element is changed, the position of the traction point is changed towards the direction approaching to/separating from the rotation center relative to the position of the output ring disk, so that the transmission ratio is reduced/increased, and the speed change is realized.
After adopting above-mentioned technical scheme, will have such beneficial effect: in the whole speed regulation process of the speed regulation unit, the rotation axis of the input shaft, the rotation axis of the output shaft and the common tangent passing through the traction point of the non-spin stepless speed regulation unit all intersect at one point, namely, no spin efficiency loss exists in the speed regulation range.
Drawings
FIG. 1 is a schematic diagram of a spin-free single-ring disk continuously variable transmission unit.
FIG. 2 is a schematic diagram of the low speed output of a spin-free single ring disc continuously variable transmission unit.
FIG. 3 is a schematic diagram of the high speed output of a spin-free single ring disc continuously variable transmission unit.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in figure 1, the invention provides a spin-free single-ring disc type stepless speed change unit which mainly comprises an input ring disc 1, an input shaft 2, an output ring disc 3 and an output shaft 4.
The input ring disk 1 is fixedly connected with the input shaft 2, and can rotate around the input shaft rotation axis 5 together, and the output ring disk 3 is fixedly connected with the output shaft 4, and can also rotate around the output shaft rotation axis 6 together. The input ring disc 1 and the output ring disc 3 are pressed and contacted with the traction point 7, and the input shaft 2 and the output shaft 4 are arranged at a certain angle, wherein the angle is theta, and the angle is kept unchanged in the speed regulation process.
During transmission, power is input by the input shaft 2, the input shaft 2 drives the input annular disc 1 to rotate together, the input annular disc 1 pulls the output annular disc 3 to rotate, and the power is transmitted to the output shaft 4 by the output annular disc 3 and then is transmitted.
The traction transmission of the continuously variable transmission unit proposed by the invention at the traction point 7 is spin-free. The output ring disk busbar 8 is a curve whose equation satisfies:
wherein the origin O of the coordinate system XOY is on the rotation axis 6 of the output shaft, the X axis is coincident with the rotation axis 6 of the output shaft, R is the distance from the traction point 7 to the rotation axis 5 of the input shaft along the direction perpendicular to the rotation axis 6 of the output shaft, θ is the included angle between the input shaft 2 and the output shaft 4, and C is a real constant. The two sides of the equation are used for deriving y and simplifying the equation to obtain:
on the other hand, the coordinates of the intersection point of the common tangent line passing through the traction point 7 and the output shaft rotation axis 6 should be:the coordinates of the intersection point of the input shaft rotation axis 5 and the output shaft rotation axis 6 are: (x- (R-y) ′ )tanθ,0)。
Due to the aboveIt is apparent that the coordinates of these two intersections coincide. That is, due to the special shape of the output ring disk bus 8, the input shaft rotation axis 5, the output shaft rotation axis 6 and the common tangent passing through the traction point 7 can always intersect at one point in each state in the transmission process, according to noSpin conditions, such traction drives have no spin loss.
The input shaft 2 is provided with a profiling speed regulation disc 13, the profiling speed regulation disc 13 is provided with a vertical track 11 and a profiling track 12, the vertical track 11 is perpendicular to the output shaft 4, the profiling track 12 is identical to the output ring disc bus 8 in shape, the input shaft 2 is respectively provided with a sliding block 9 and a roller 10, the sliding block 9 is provided with a chute for limiting the included angle theta between the input shaft 2 and the output shaft 4, the sliding block 9 is limited in the vertical track 11 and can slide along the vertical track 11, the roller 10 is arranged in the profiling track 12 and can slide along the profiling track 12, so that the input shaft 2 only needs to be driven to move during speed regulation, and the input shaft 2 does profiling motion because the sliding block 9 and the roller 10 are limited in corresponding tracks.
As shown in fig. 2, the spin-free single-ring disc type stepless speed change unit outputs at a low speed. In this case, the input ring disk 1 makes a profiling motion towards the outer edge of the output ring disk 3, the included angle between the input shaft 2 and the output shaft 4 remains unchanged, and the input ring disk 1 and the output ring disk 3 are always kept pressed and contacted. Because of the change of the relative position of the transmission elements, the position of the traction point 7 relative to the position of the output ring disk 3 changes in a direction away from the rotation center, so that the transmission ratio becomes large and the output is performed at a low speed.
As shown in fig. 3, the spin-free single-ring disc type stepless speed change unit outputs at a high speed. In this case, the input ring disk 1 moves in a copying manner with respect to the center of the output ring disk 3, the angle between the input shaft 2 and the output shaft 4 remains unchanged, and the input ring disk 1 and the output ring disk 3 are always kept pressed and contacted. Because of the change of the relative position relation of the transmission elements, the position of the traction point 7 relative to the position of the output ring disk 3 changes towards the direction close to the rotation center, so that the transmission ratio becomes small and the output is performed at high speed.
In summary, the invention can provide a traction type stepless speed change unit, which can realize the purpose of continuous speed regulation, has no spin loss in the transmission process and has higher efficiency.
Claims (2)
1. A spin-free single-ring disc type stepless speed change unit comprises an input ring disc (1), an input shaft (2), an output ring disc (3) and an output shaft (4); the method is characterized in that: the input ring disc (1) is fixedly connected with the input shaft (2), and the input ring disc (1) and the input shaft (2) can rotate around the rotation axis (5) of the input shaft; the output ring disc (3) is fixedly connected with the output shaft (4), and the output ring disc (3) and the output shaft (4) can rotate around an output shaft rotation axis (6); the input ring disc (1) and the output ring disc (3) are tightly pressed and contacted with the traction point (7), and the input shaft (2) and the output shaft (4) are arranged at a certain angle; the output ring disk bus (8) on the output ring disk (3) is a curve, and the equation thereof satisfies:
wherein the origin O of the coordinate system XOY is on the rotation axis (6) of the output shaft, the X axis is coincident with the rotation axis (6) of the output shaft, R is the distance from the traction point (7) to the rotation axis (5) of the input shaft along the direction perpendicular to the rotation axis (6) of the output shaft, theta is the included angle between the input shaft (2) and the output shaft (4), and C is a real constant.
2. The spin-free single-ring disc type stepless speed change unit according to claim 1, characterized in that a profiling speed regulation disc (13) is arranged at the input shaft (2), a vertical track (11) and a profiling track (12) are arranged on the profiling speed regulation disc (13), the vertical track (11) is perpendicular to the output shaft (4), the profiling track (12) is identical to the bus bar (8) of the output ring disc in shape, a sliding block (9) and a roller (10) are respectively arranged on the input shaft (2), an included angle theta is kept between the input shaft (2) and the output shaft (4) by the sliding block (9), the sliding block (9) is limited in the vertical track (11) and can slide along the vertical track (11), and the roller (10) is arranged in the profiling track (12) and can slide along the profiling track (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610929317.2A CN107339385B (en) | 2016-10-31 | 2016-10-31 | Spin-free single-ring disc type stepless speed change unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610929317.2A CN107339385B (en) | 2016-10-31 | 2016-10-31 | Spin-free single-ring disc type stepless speed change unit |
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| CN107339385A CN107339385A (en) | 2017-11-10 |
| CN107339385B true CN107339385B (en) | 2023-08-15 |
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| CN201610929317.2A Active CN107339385B (en) | 2016-10-31 | 2016-10-31 | Spin-free single-ring disc type stepless speed change unit |
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| CN103728075A (en) * | 2014-01-07 | 2014-04-16 | 四川大学 | Tester for elastohydrodynamic lubricating oil film traction with spinning |
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Effective date of registration: 20240206 Address after: 518000 1002, Building A, Zhiyun Industrial Park, No. 13, Huaxing Road, Henglang Community, Longhua District, Shenzhen, Guangdong Province Patentee after: Shenzhen Wanzhida Technology Co.,Ltd. Guo jiahuodiqu after: Zhong Guo Address before: 610039, No. 999, Jin Zhou road, Jinniu District, Sichuan, Chengdu Patentee before: XIHUA University Guo jiahuodiqu before: Zhong Guo |