KR20150004622A

KR20150004622A - Continuously Variable Transmission

Info

Publication number: KR20150004622A
Application number: KR1020130077862A
Authority: KR
Inventors: 이춘우
Original assignee: 이춘우
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2015-01-13

Abstract

Provided is a continuously variable transmission comprising: a pair of input links fixedly and externally touching the driving shaft of an engine or a motor, and separated from each other at a certain distance in the direction of a rotation central axis line; a driven shaft arranged to be parallel to the driving shaft; a pair of output links separated from each other at a certain distance in the direction of a rotation central axis line, and externally touching the driven shaft when one-way clutches are interposed between the driven shaft and the output links respectively; and a pair of arc- or ring-shaped coupling links having one ends link-coupled to the input links respectively at a phase difference of 180 degrees when link pins are interposed between the input links and the one ends of the coupling links, and having the other ends of which the outer teeth are engaged with the output links respectively, wherein the link pins are capable of being moved in the rotation radius directions of the input links according to a load. According to the present invention, the coupling links and the output links are coupled to each other like gears, so the continuously variable transmission can be applied to a crane or the like handling a high load. In addition, according to the present invention, bearings are not installed between the coupling links and the output links, so a periodic lubrication can be excluded to reduce maintenance costs. Furthermore, according to the present invention, a driving force at a regular angular velocity can be transmitted to the output links at every one rotation of the input links.

Description

[0001] Continuously Variable Transmission [

The present invention relates to a continuously variable transmission, and more particularly to a continuously variable transmission using a lever crank mechanism.

The continuously variable transmission is a transmission capable of continuous shifting within a given shift range, unlike conventional manual and automatic transmissions having a limited speed range of 4 to 5 stages.

Conventional transmissions are operated with a speed varying gear with different gears meshing with the engine shaft. In the first stage, the engine shaft is meshed with the largest gear and moves slowly. On the contrary, when the gear is meshed with the small gear, the speed increases. That is, it is fixed and moves at a constant gear ratio. In this way, gears that use gears are limited in the shifting phase, causing shocks in shifting.

On the other hand, the continuously variable transmission is a system in which the shifting steps are continuously performed. Since the shifting is smooth in accordance with the engine output, the loss of power generated during shifting can be reduced. , It is possible to improve the fuel efficiency by more than 20% as compared with the automatic transmission by enabling the optimum operation of the engine, and there is also an effect of reducing the exhaust gas.

Such a continuously variable transmission includes a frictional type using a frusto-conical drum or an hourglass-shaped drum, and a lever type using a lever crank mechanism.

In the frictionless type continuously variable transmission, since the drive transmission is realized by the friction, the power transmission efficiency is not good. In the lever type continuously variable transmission, since the drive transmission is realized by the link movement, the power transmission efficiency is good.

The lever type continuously variable transmission is disclosed in Korean Patent No. 10-109316.

1 and 2 of the Korean Patent Publication, the above-described lever type continuously variable transmission includes an input link which is fixedly circumscribed to a drive shaft and varies in a radial direction in accordance with a load, a circumscribed And a coupling crank mechanism including a coupling (coupler) link to which the input link and the output link are coupled at both ends thereof, are arranged to have a phase difference of 180 degrees with respect to the driving shaft and the driven shaft.

However, the lever type continuously variable transmission as described above has a problem that the coupling link and the output link are coupled by the link pin, so that the load is concentrated on the link pin and can not be applied as a continuously variable transmission to a crane handling a high load, And a bearing is interposed between the coupling link and the output link to permit a relative pivotal movement therebetween. However, the number of parts increases and the lubrication process is periodically performed, thereby increasing manufacturing costs and maintenance costs.

A lever-type continuously variable transmission for overcoming such a problem has been filed as a pending Patent Application No. 10-2013-0077259 by the present inventor.

However, in the patented continuously variable transmission, the angular speed of the internal gear meshed with the engagement link is different for each rotation of the input link and the angular speed between the pair of output links meshed with the internal teeth and the external teeth of the engagement link are different, There is a problem that the driving force can not be transmitted at the angular velocity.

The present invention has a problem in solving the above-mentioned problems.

The present invention relates to an engine or a motor having a pair of input links which are fixedly circumscribed by a drive shaft of an engine or a motor in a fixed spacing in the axial direction of a rotation center axis, a driven shaft disposed parallel to the drive shaft, A pair of input links each of which is circumscribed via a one-way clutch in a state of being spaced apart from each other, and a pair of input links each of which is linked by a link pin with a phase difference of 180 degrees with respect to each of the pair of input links, And a pair of engagement links each having an arc or ring shape in which output links of the input links are engaged with each other, wherein the link pins are movable in the rotation radial direction of the input link in accordance with the load. Can be solved.

According to the present invention, since the coupling link and the pair of output links are gear-coupled by the above-described problem, the present invention can be applied as a continuously variable transmission to a crane handling a high load, It is possible to reduce the maintenance cost by eliminating the lubrication process periodically and to transmit the driving force to the pair of output links at a constant angular speed for each rotation of the input link.

1 is a conceptual perspective view of a continuously variable transmission according to an embodiment of the present invention,
2 is a view showing when one of a pair of output links of the Fig. 1 continuously variable transmission is driven in a clockwise direction, and Fig.
Fig. 3 is a view showing when the other one of a pair of output links of the continuously variable transmission of Fig. 1 is driven in a clockwise direction; Fig.

Hereinafter, the continuously variable transmission of the embodiment according to the present invention will be described in detail with reference to Figs.

In Fig. 1, the continuously variable transmission of this embodiment is indicated by reference numeral 100. Fig.

The continuously variable transmission 100 includes a pair of input links 20 and 20 in the form of a disk or a rod that is fixedly circumscribed and spaced apart from the drive shaft 11 of the engine or motor 10 by a predetermined distance in the direction of the axis of rotation, A driven shaft 30 disposed parallel to the driven shaft 11 and having a gear shape circumscribed via one-way clutches 31, 31 in a state of being spaced apart from the driven shaft 30 by a predetermined distance in the direction of the axis of rotation center A pair of output links (32, 32) and a pair of input links (20, 20) respectively linked through link pins (21, 21) with a phase difference of 180 degrees through a pair of link pins And a pair of engaging links 40 and 40 of an arc or ring shape in which the pair of output links 32 and 32 are engaged with gears 42 and 42, respectively.

The link pins 21 and 21 are movable in the radial direction of rotation of the pair of input links 20 and 20 according to a load. That is, each of the pair of input links 20 and 20 is provided with a pair of slot guide grooves 22 and 22 extending in the radial direction for guiding each of the pair of link pins 21 and 21 in a radial direction A radially inner end of the pair of slot guide grooves 22 and 22 and a pair of link pins 21 and 21 are provided with a spring And a pair of variable means 23, 23 which are elastically variable in the radial direction as shown in Fig.

The one-way clutches 31 and 31 are known to be capable of transmitting power when the pair of output links 32 and 32 are rotated in a clockwise direction, One-way clutch.

1 to 3 show a pair of coupling links 40 and 40 having a ring gear shape, the present invention is not limited thereto and may have an arc shape having a constant arc length.

Inner gears 41 and 41 are formed on the inner circumferential surfaces of the pair of coupling links 40 and 40 and idle gears 50 and 50 rotatably engaged with the inner gears 41 and 41 And is preferable from the viewpoint that the linking motion of the pair of coupling links 40, 40 can be stably guided.

The continuously variable transmission configured as described above may be operated as follows.

First, when the drive shaft 11 rotates clockwise, the pair of link pins 21 and 21 revolve about the rotation center axis of the drive shaft 11, As shown in FIGS. 2 and 3, each of the link pins 21 performs a link motion while drawing an elliptic trajectory by a pair of link pins 21 that perform idly motion with a phase difference of 180 degrees.

One of the pair of output links 32 and 32 is connected to one of the pair of link pins 21 and 21, Clockwise rotation and counterclockwise rotation are repeated for each rotation of the pin 21 and the other output link 32 is repeatedly provided to the other link pin 21 of the pair of link pins 21, ) And the counterclockwise rotation and the clockwise rotation are repeated.

Accordingly, among the pair of output links 32 and 32, the clockwise output link 32 is pushed by the corresponding one-way clutch 31 to transmit power to the driven shaft 30 in the clockwise direction, Of the pair of output links 32, the output link 32 rotating in the counterclockwise direction is not hung by the one-way clutch 31, so that no power is transmitted to the driven shaft 30 in any direction.

Thus, the driven shaft 30 receives power in a clockwise direction from the pair of output links 32 and 32 sequentially in succession during one revolution of the pair of link pins 21 and 21, .

In this state, a load transmitted to the driven shaft 30 by a not-shown driven object (for example, a wheel) coupled to the driven shaft 30 is transmitted through the coupling link 40 to the pair of link pins 30 And the pair of link pins 21 and 21 having received the load are moved radially inward when the load is increased so that the angular momentum of the pair of output links 32 and 32 When the load is reduced, the amount of angular movement of the pair of output links 32 and 32 is reduced by moving to the outside in the radial direction. As a result, the driven shaft 30 is automatically moved in accordance with the load to be driven by the driven object. .

The pair of variable means 23 and 23 are connected to the control unit to receive the load information transmitted by sensing the load transmitted to the driven shaft 30 and transmit the load information to the pair of link pins 21 and 21 according to the load information. In a radial direction. An example thereof is disclosed in Japanese Patent Laid-Open Publication No. 2012-206545.

In the continuously-variable transmission operating as described above, the pair of coupling links 40 and the pair of output links 32 and 32 are gear-coupled to be able to be applied as a continuously variable transmission to a crane handling a high load And a bearing is not provided between the pair of coupling links 40 and 40 and the pair of output links 32 and 32. This eliminates the periodic lubrication, In addition, the driving force can be transmitted to the pair of output links 32 and 32 at a constant angular velocity for each rotation of the pair of input links 20 and 20.

20; Input link, 30; Driven shaft, 40; Binding link

Claims

In the continuously variable transmission (100) using the lever crank mechanism,
A pair of input links 20 and 20 fixedly circumscribed to the drive shaft 11 at predetermined intervals in the direction of the axis of rotation,
A driven shaft 30 disposed parallel to the drive shaft 11,
A pair of output links (32, 32) having a gear shape circumscribed via one-way clutches (31, 31) in a state of being spaced apart from the driven shaft (30)
The pair of input links (20, 20) are connected to the external gears (42, 42) formed on the outer peripheral surface by a pair of link pins (21, 21) And a pair of engagement links (40, 40) of an arc or ring shape in which the output links (32, 32) are engaged,
And the pair of link pins (21, 21) are movable in the radial direction of rotation of the pair of input links (20, 20) in accordance with a load.

The method according to claim 1,
Each of the pair of input links 20 is formed with a pair of slot guide grooves 22, 22 extending in a radial direction for guiding the pair of link pins 21, 21 so as to be movable in the radial direction ,
The pair of slot guide grooves (22, 22) is provided with a pair of variable means (23, 23) for radially varying the pair of link pins (21, 21) A continuously variable transmission.

3. The method according to claim 1 or 2,
The one-way clutches (31, 31) are configured such that when the pair of output links (32, 32) rotate in the clockwise direction, the power transmission is possible and the power transmission is possible, And the second clutch is engaged.

3. The method according to claim 1 or 2,
Inner gears (41, 41) are formed on inner circumferential surfaces of the pair of coupling links (40, 40)
And an idle gear (50) rotatably engaged with the base is engaged with the internal gears (41, 41).