CN2081919U

CN2081919U - Rigid stepless speed-variating mechanism

Info

Publication number: CN2081919U
Application number: CN 90203691
Authority: CN
Inventors: 张德昆
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-03-30
Filing date: 1990-03-30
Publication date: 1991-07-31

Abstract

A rigid stepless speed-variating mechanism belongs to a transmission device and comprises a pendulum rod shaft (1), a star wheel (2), an overrunning gear (3), a servo sliding block (4), a cam (5), a pendulum rod (6), an internal gear (7), a spring (8), a cam shaft (9), a roller (10), a spline (11), etc. The mechanism can steplessly change the transmission ratio in a certain range, the selected speed ratio is not affected by the change of torque, and a large speed ratio can be produced. Applied in various machines in various fields, the mechanism has the advantages of small volumn, light weight, accurate speed ratio and high efficiency.

Description

Rigid stepless speed-variating mechanism

The utility model belongs to a kind of transmission device.

Up to now, the gear in the machine driven system generally is divided into constant speed ratio and stepless change than two kinds.The constant speed that adopts the unit transmission is than mechanism, and as planetary gears, harmonic wave mechanism, turbine mechanism, fixed axis gear mechanism etc., its transmission speed is than the restriction owing to volume and efficient, and speed ratio can infinitely not increase.No matter stepless speed changing mechanism is mechanical, electronic or hydraulic pressure mostly be a kind of flexible drive, its transmission speed ratio often slows down with rotating speed, the increase accuracy rate of moment of torsion descends, and directly influences mechanical property.

The purpose of this utility model designs exactly that a kind of its optional gear ratio is not subjected to the influence of change in torque when the stepless change velocity ratio, can produce the very rigidity stepless speed changing mechanism of large speed ratio simultaneously.

The utility model by fork axle, star-wheel, surmount gear, form with movable slider, cam, fork, internal gear, spring, camshaft, roller, key etc.Utilize the mechanical transmission of each several part, make internal tooth crop rotation uniform circular motion, with this as output speed.

Below in conjunction with accompanying drawing structural feature of the present utility model is further described:

Fig. 1 is a cross-sectional view of the present utility model

Fig. 2 is a longitudinal section of the present utility model

Fig. 3 is the plan view of cam of the present utility model

Fig. 4 is the sectional drawing of the utility model cam

Wherein: (1) fork axle (2) star-wheel (3) surmounts gear (4) with movable slider

(5) cam (6) fork (7) internal gear (8) spring (9) is protruding

Wheel shaft (10) roller (11) key

Implementation methods of the present utility model is: star-wheel (2) is connected with fork (6), be fixed on the casing by fork axle (1), surmount gear (3) and go into, wherein surmount gear (3) and be equivalent to overcoat in the free wheel device, be gear shape by the wedge slot wedge of roller (10) and star-wheel (2).Internal gear (7) with surmount gear (3) engagement, there is a semicircle or spherical groove lower end of fork (6), with movable slider (4) the semicircular in shape shape of maybe can rolling, with this gapped being bumped in this groove, its underpart contacts with cam (5), can do the centering swing along with cam rotation.Spring (8) the one ends casing that is connected, the other end fork (6) that is connected plays and makes fork remain the effect that contacts with cam (5).As shown in Figure 3, Figure 4, the L of cam (5) ₀Section is the counterweight section, is the centrifugal force that equilibrium cam off-centre is produced, and makes mechanical operation steady.The L section is a cam segment, its Base radius equates, is zero-bit with its Base radius, and radius increases to a certain value gradually with corner and reduces to get back to zero-bit again gradually, it is that the lift angle of circular order increases gradually that the increment of this radius simultaneously increases again vertically gradually, thereby forms the peripheral curved of cam.Cam (5) makes cam rotate with camshaft (9) by the effect of key (11), also can move vertically.

In conjunction with the accompanying drawings principle of the present utility model is illustrated: motive force is that camshaft (9) drives cam rotation by input shaft, contact swings along with doing centering with movable slider (4) with it, make fork (6) with the swing at the uniform velocity of cam do, under the drive of fork (6), star-wheel (2) is made dead axle and is back and forth rotated on fork axle (1), when the swing of a fork reaches the full swing amplitude, under the effect of spring (8), make fork (6) recover start bit, keep fork (6) to contact with cam (5) all the time, continuous rotation along with cam (5), each fork is made reciprocally swinging successively, under the effect of fork (6), each star-wheel (2) is done back and forth to rotate successively, by roller (10) the reciprocal rotation of star-wheel is transformed into the rotation successively that surmounts gear (3), thereby make with the internal gear (7) of its engagement and make uniform circular motion, with this as output speed.Because the increment of the cam radius of rigidity stepless speed changing mechanism is that to increase gradually vertically or reduce be that the lift angle of circular order of cam changes vertically.According to actual needs, cam (5) is moved along axle, at this moment just changed the contact position on the fork (6) with movable slider (4) and cam (5), be that the pendulum angle of fork is sent out and risen change, impel the rotating speed that surmounts gear (3) to change, promptly change the rotational velocity of internal gear (7), reached infinite variable speed purpose.If this mechanism is the gear of constant speed ratio, cam design can be become do not have vertically the radius increment is that circular order is to wait lift angle.

Advantage part of the present utility model is: the variation gearratio that this mechanism is can be within the specific limits stepless, and selected gearratio can not be subjected to the impact of change in torque, can produce very big speed ratio simultaneously. This mechanism's volume is little, in light weight, rotating ratio is accurate, the efficient height, can be applicable in the various machineries such as electromechanics, chemical industry, oil, weaving, food, automobile, aircraft, mine, metallurgy, building, medical treatment, not only in scientific experimentation, have unique effect in the technological innovation, and will cause the update of mechanical industry.

Claims

1, a kind of rigidity stepless speed changing mechanism, it is characterized in that: it is by fork axle (1), star-wheel (2), surmount gear (3), with movable slider (4), cam (5), fork (6), internal gear (7), spring (8), camshaft (9), key (10), roller (11) is formed, there are a semicircle or spherical groove in described fork (6) lower end, with movable slider (4) the semicircular in shape shape of maybe can rolling, with this gapped being bumped in the groove, its underpart contacts with cam (5), star-wheel (2) is connected with fork (6), by fork axle (1) fixedly on the casing, surmounting gear (3) goes into by the roller (10) and the wedge slot wedge of star-wheel (2), internal gear (7) with surmount gear (3) engagement, spring (8) the one ends casing that is connected, the other end fork (6) that is connected, cam (5) is connected with camshaft (9).

2, rigidity stepless speed changing mechanism according to claim 1 is characterized in that cam (5) has a counterweight section L and cam segment L, and cam segment I radius increment vertically increases gradually or reduces gradually or do not change.