WO2015003499A1

WO2015003499A1 - Stepless speed-changing device

Info

Publication number: WO2015003499A1
Application number: PCT/CN2014/072332
Authority: WO
Inventors: 唐坤亮
Original assignee: Tang Kunliang
Priority date: 2013-07-10
Filing date: 2014-02-20
Publication date: 2015-01-15
Also published as: CN103615502A; CN103615502B

Abstract

Disclosed is a stepless speed-changing device. The stepless speed-changing device comprises an input shaft (1), an input spiral gear, an output shaft (8) and an output spiral gear, wherein the input spiral gear comprises an input cone (2) and input teeth (3), the input teeth are spirally arranged in multiple circles on the outer circumferential surface of the input cone along the axis thereof, and the screw pitches of each circle of input teeth are equal and the number of the multiple circles of input teeth is increased in an integral-multiple equal proportion; the output spiral gear comprises an output cone (10) and output teeth (5), the output cone can slide along the output shaft (8) and transfer torque to the output shaft, the output teeth are spirally arranged in at least one circle on the outer circumferential surface of the output cone along the axis thereof, the spiral direction of the output teeth is opposite to that of the input teeth, and the screw pitches of each circle of output teeth are equal to the screw pitches of the input teeth; and the input spiral gear is engaged with the output spiral gear. The output torque of the stepless speed-changing device is far greater than that of the steel belt continuously variable transmission and the stepless speed-changing device can be applied to high-emission off-road vehicles and heavy-duty trucks.

Description

Continuously variable transmission

TECHNICAL FIELD The present invention relates to the field of transmissions, and more particularly to a continuously variable transmission.

BACKGROUND OF THE INVENTION A gearbox is an important core component of a car. From a development trend, automatic continuously variable speed is the ultimate goal. From the gearbox that is commonly used nowadays, the manual transmission and the automatic transmission have a complicated structure. After the shift position is increased to 7 gears, there are more than 500 parts in the transmission, which is technically and costly. Then increase the space up. The most mature steel belt type infinitely variable speed (CVT) uses friction transmission, not gear meshing. It is limited by the strength and frictional resistance of the steel strip material. The torque reaches 300 Nm almost limit, in the big 4 non-powered off-road vehicles and Cannot be applied on heavy trucks.

In view of this, there is currently no gear unit that is structurally reliable, capable of outputting a large torque, and capable of achieving a continuously variable shifting device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a continuously variable transmission to solve the above problems.

In an embodiment of the present invention, there is provided a continuously variable transmission comprising an input shaft, an input helical gear, an output shaft and an output helical gear; the input helical gear comprises an input cone and an input tooth; and the input cone is rotatably coupled to the input shaft The input teeth are spirally arranged along the axis of the outer circumference surface of the input cone; the pitch of each input tooth is equal and the number of teeth of the input teeth is increased by an integral multiple; the output helical gear includes an output cone and Output tooth; the output cone can slide along the output shaft and transmit torque to the output shaft; The outer circumferential surface of the outer cone is spirally arranged along the axis thereof at least one turn; the spiral direction of the output teeth is opposite to the spiral direction of the input teeth; the pitch of each output tooth is equal to the pitch of the input teeth; the input helical gear and the output spiral Gear meshing.

The continuously variable transmission device according to the embodiment of the present invention includes an input shaft, an output shaft, and an input helical gear and an output helical gear as compared with the prior art continuously variable transmission. The power is input from the input shaft. Since the input cone of the input helical gear is rotationally coupled to the input shaft, the input cone rotates with the input shaft, and at the same time, the input helical gear meshes with the output helical gear, thereby transmitting the rotation to the output shaft. . When infinitely variable speed is required, since the output cone can slide along the output shaft, and the input teeth are spirally arranged along the axis of the outer circumference surface of the input cone, the output teeth are on the outer circumferential surface of the output cone. The spiral is arranged along the axis at least one turn, and when the output cone slides on the output shaft, the output teeth always engage with the input teeth, that is, the rotation of the input shaft is always transmitted to the output shaft during the shifting process, thereby achieving stepless Variable speed. Moreover, the continuously variable transmission includes only the input helical gear provided on the input shaft and the output helical gear provided on the output shaft, and the structural design of the continuously variable transmission is reliable, and the continuously variable transmission uses gears to realize power The transmission, the torque transmitted by the gear is large, therefore, the torque output of the continuously variable transmission is much larger than that of the steel belt type infinitely variable speed, and can be applied to large displacement off-road vehicles and heavy trucks.

DRAWINGS

1 is a schematic structural view showing a different tooth width of an input tooth and an output tooth of a continuously variable transmission according to an embodiment of the present invention; schematic diagram

3 is a schematic view showing the structure of an output helical gear according to an embodiment of the present invention; and FIG. 4 is a structural schematic view showing the output shaft and the output cone of the embodiment of the present invention being spline-fitted.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be further described in detail by way of specific embodiments and the accompanying drawings.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, a continuously variable transmission device according to the embodiment includes an input shaft 1, an input helical gear, an output shaft 8 and an output helical gear; and the input helical gear includes an input cone The body 2 and the input tooth 3; the input cone 2 is rotatably connected to the input shaft 1; the input tooth 3 is spirally arranged along the axis of the outer circumference surface of the input cone 2; the pitch of each input tooth 3 is equal and more The number of teeth of the input tooth is increased by an integral multiple; the output helical gear includes an output cone 10 and an output tooth 5; the output cone 10 is slidable along the output shaft 8 and transmits torque to the output shaft 8; the output tooth 5 is at the output cone The outer circumferential surface is spirally arranged at least one turn along its axis; the spiral direction of the output tooth 5 is opposite to the spiral direction of the input tooth 3; the pitch of each of the output teeth 5 is equal to the pitch of the input tooth 3; the input helical gear and output The helical gear meshes.

In order to facilitate sliding of the output helical gear on the output shaft, the continuously variable transmission further includes a shift fork 6 for sliding the output helical gear to slide on the output shaft 8. By using the shift fork 6, the output helical gear can be slid on the output shaft 8, and the speed ratio of the input helical gear and the output helical gear can be changed, thereby achieving stepless shifting. Since both the input tooth 3 and the output tooth 5 are spirally arranged, when the output cone is at different positions of the output shaft, the output teeth mesh with the input teeth of different diameters, which may cause the meshing between the output teeth and the input teeth to be inaccurate, To avoid this problem, the continuously variable transmission further includes an angle adjusting device 9 for adjusting the angle between the input shaft 1 and the output shaft 8. Specifically, when the output cone slides along the large end direction of the output cone on the output shaft, the angle adjusting device 9 can be used to make the angle between the output shaft 8 and the input shaft 1 small, thereby making the output teeth The tightness of the engagement with the input teeth at all times.

In order to make the output cone and the output shaft slide and rotatably connect, the output cone and the output shaft are spline-fitted. Specifically, an internal spline may be disposed on the output cone, and an external spline may be disposed on the output shaft to ensure that the output cone can slide on the output shaft and transmit rotation.

Further, one side of the output tooth is provided with a limit block 7 higher than the tooth height of the output tooth 5; a finite bit groove 4 is disposed between two adjacent input teeth of the input helical gear; the limit block 7 and the limit groove 4 Cooperate. Specifically, one side of the output tooth is disposed as a convex spiral stop block higher than the tooth height, and a spiral limit groove is formed between the two helical teeth of the input tooth to ensure axial adjustment When the cone is output, the two sets of meshed tooth-constrained block and the limit groove cooperate in the process of moving the cone in the axial direction, so that the output cone can only move in the spiral direction without being affected by the tooth. Misaligned to form a tooth removal.

Preferably, the output teeth are helically arranged along the axis of the outer circumferential surface of the output cone. Of course, the output teeth can also be spirally arranged one-half, two or more turns along the axis of the outer circumference surface of the output cone, that is, equal to or greater than 360 degrees. In particular, the widths of the input and output teeth are not equal. Of course, the widths of the input and output teeth can also be equal.

The stepless shifting process of the continuously variable transmission is specifically described: the output cone is toggled using a shift fork, and the output cone is pressed along its large end, because the input helical gear meshes with the output helical gear, and the restricted bit block And the limitation of the limit groove, the output cone can only move in the spiral direction during the rotation, thereby adjusting the position of the output cone on the output shaft, and the output cone always has the input tooth during the movement process. The meshing is always maintained. Since the transmission ratio between the output teeth and the input teeth of different diameters is different, the output cone can be continuously changed during the moving process, and the stepless shifting can be realized.

In the continuously variable transmission of the embodiment of the present invention, the teeth having the same pitch are arranged in a spiral manner on the input round push body and the output round push body, and the following two conditions are ensured:

1. The pitch of the spiral is equal, that is, the spacing of each adjacent two sets of helical toothed belts is equal.

2. The spiral ratio is equal, that is, the number of teeth per 360 degrees of the spiral is kept in an integer multiple of the same proportion. If the helix ratio is 2, the origin is set at any point. After the spiral is 360 degrees, the diameter is twice the diameter of the origin. For example, the angle at the origin is 10 degrees, which is exactly 1 pitch, and the angle after the spiral is 360 degrees. 10 degrees is exactly 2 pitches and is the same at any position. The number of teeth of each turn of the input and output spiral teeth can be divisible by this integer multiple of the helical ratio, and the two helical toothed belts of such a structure can be continuously rotated and cyclically engaged.

An auger gear having the same pitch, the same pitch, and the same helical ratio as the input helical gear is disposed on the output helical gear, but the spiral direction is opposite to the input helical gear, and the above two conditions are satisfied. In order to ensure that the two sets of helical gears can be meshed and rotated regardless of sliding to any position, the spiral tooth setting of the output helical gear is equal to or slightly larger than the 360 degree spiral circumference. In order to ensure that when one end of the spiral tooth is disengaged during the rotational engagement, the other end of the spiral toothed belt can enter the engagement in advance or at the same time, so that the engagement can be cycled and continuous.

The output helical gear sets the internal spline, and the output shaft is provided with external splines. The inner and outer splines are relatively engaged and can be slid in the direction of 4 from the line.

One side of the helical tooth of the output helical gear is set to a convex spiral-shaped limit block higher than the tooth height, and a spiral limit groove is formed between two adjacent teeth of the input helical gear, and the limit block is engaged Always embedded in the limit slot. In order to ensure that the output helical gear has axial movement when the fork adjusts the power output helical gear, the two sets of meshing helical gears are restricted by the restricted block and the limit groove, and the external force of the fork makes the input helical gear and The output helical gear produces a rotational speed difference such that the output helical gear is axially displaced relative to the input helical gear in a helical manner without dislocation due to gear misalignment.

Because the input helical gear and the output helical gear are spirally shaped, the two shafts are eight-shaped when sliding the output helical gear, so the output shaft must be adjusted synchronously with the input shaft to ensure the input helical gear and output. The helical gears remain engaged at all times.

Because the diameter of the meshing part of the input helical gear and the output helical gear is different, when the small-diameter output tooth rotates 360 degrees, the large-diameter input tooth rotates less than 360 degrees. At this time, the large-diameter helical tooth meshing will produce less than one pitch. Axial misalignment, in order to avoid such misalignment, forming tooth removal or transmission interference. This can be avoided by designing either of the following two configurations. A: As shown in Figure 2, the fork is reserved for a certain clearance. When the fork is fixed, the output helical gear is rotated by the spiral limit block and the limit groove during the rotation, and can be axially in the fork clearance. slide. Two: As shown in Figure 1, the helical limit groove of the input helical gear is wider than the limit block of the output helical gear, and the width of the tooth of the input helical gear is It is narrower than the width of the teeth of the output helical gear, but the sum of the width of the teeth of the input helical gear and the width of the limit groove is equal to the sum of the limit block of the output helical gear and the width of the teeth. In this way, the misalignment of the two wheels can be realized, and the two helical teeth can be restricted from being dislocated and not interfered.

The continuously variable transmission has two states, one of which is a constant speed state: the input helical gear rotates at a constant speed, and the output helical gear that rotates correspondingly rotates, because the output helical gear has only one spiral circumference, and the output helical gear is fixed. The position continues to circulate continuously, and the output shaft outputs power through the inner and outer splines.

The second is the shifting state: the output helical gear shifts, the fork pushes the output helical gear to move along the axial direction toward the big end of the input cone, and the two sets of meshing helical gears are restricted by the helical limit block and the limit slot. The external force of the fork causes the input helical gear and the output helical gear to generate a rotational speed difference, so that the output helical gear is axially displaced relative to the input helical gear in a helical manner, and the gear remains engaged while moving. The moving output helical gear meshes with the larger diameter input helical gear and drives, which increases the rotational speed ratio and increases the rotational speed of the output shaft, achieving an acceleration effect.

When the output helical gear is moved in the axial direction, the angle between the output shaft and the input shaft is synchronously adjusted to ensure that the input helical gear and the output helical gear are constantly engaged.

Conversely, moving the output helical gear toward the small-diameter helical tooth achieves the effect of deceleration. The continuously variable transmission device of the embodiment of the invention has the following features:

1. When shifting, it can be continuously and smoothly changed like the friction type stepless speed change device.

2. When driving, 卩 gear type 4 Qing Zhuan transmission.

3, the transmission torque can reach the same high torque of the gear.

4. The gear ratio can be greatly increased by increasing the taper ratio of the input helical gear. 5. The structural unit is reliable and the cost is greatly reduced. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A continuously variable transmission characterized by comprising an input shaft, an input helical gear, an output shaft, and an output helical gear;

The input helical gear includes an input cone and an input tooth; the input cone is rotatably coupled to the input shaft; the input teeth are helically arranged along an axis of the outer circumference surface of the input cone; The pitch of the input teeth is equal and the number of teeth of the plurality of input teeth is increased by an integral multiple;

The output helical gear includes an output cone and an output tooth; the output cone is slidable along the output shaft and transmits torque to the output shaft; the output tooth is along an outer circumferential surface of the output cone The axis is helically arranged at least one turn; the spiral direction of the output teeth is opposite to the spiral direction of the input teeth; the pitch of each of the output teeth is equal to the pitch of the input teeth;

The input helical gear meshes with the output helical gear.

2. The continuously variable transmission according to claim 1, further comprising a shifting fork for sliding the output helical gear on the output shaft.

3. The continuously variable transmission according to claim 2, further comprising

4. The continuously variable transmission according to claim 3, wherein the output cone is spline-fitted with the output shaft.

5. The continuously variable transmission according to claim 4, wherein one side of the output tooth is provided with a limit block higher than a tooth height of the output tooth; and two adjacent ones of the input helical gear有限Set a limited slot between the input teeth; The limiting block cooperates with the limiting slot.

The continuously variable transmission according to any one of claims 1 to 5, wherein the output teeth are spirally arranged at an outer circumferential surface of the output cone along its axis to be equal to or greater than 360 degrees.

7. The continuously variable transmission according to claim 6, wherein the input teeth and the output teeth have different widths.

8. The continuously variable transmission according to claim 6, wherein the input teeth and the output teeth have the same width.