CN2653225Y - Geneva mechanism - Google Patents

Abstract

The utility model discloses a sheave mechanism, comprising a driving axle, a driven axle, a driving wheel and a sheave, the driving wheel is arranged on the driving axle, the sheave is arranged on the driven axle, which is characterized in that the two ends of the diameter of the driving wheel are respectively provided with a long groove; the driving axle is provided with a sliding shoe and a limit sheave, the sheave is held still and provided with a limit groove on the top; the two ends of the sliding shoes are provided with two pin shafts which are embedded in the two long grooves of the driving wheel and capable for sliding in the long grooves, wherein one end of a pin shaft extends to the groove of the sheave, the other end extends to the limit groove of the limit sheave. The sheave of the utility model is capable for uniform rotation.

Description

A kind of Geneva mechanism

Technical field

The utility model belongs to mechanical transmission fields, particularly relates to a kind of Geneva mechanism.

Background technique

Geneva mechanism is a kind of driving mechanism that is in daily use, and it generally comprises driving wheel and sheave, has bearing pin on the driving wheel, embeds in the groove of sheave, when driving wheel rotates, drives sheave by bearing pin and rotates simultaneously.Most Geneva mechanism also has the rotation angle of locking arc with the restriction driving wheel.Under this structure, the position of bearing pin on driving wheel is constant, when the driving wheel uniform rotation, bearing pin also moves in a circle thereupon, and its angular velocity, linear velocity all are constant, and bearing pin is when promoting the sheave rotation, also will slide at the groove cathetus of sheave, therefore, sheave is not uniform rotation, but neglect fast neglecting slowly, transmission is not steady.

Summary of the invention

To be solved in the utility model is the jiggly technical problem of Geneva mechanism transmission, and the Geneva mechanism of a kind of energy uniform rotation is provided.

For this reason, the technical solution adopted in the utility model is such: Geneva mechanism, comprise driving shaft, driven shaft, driving wheel and sheave, and driving wheel is contained on the driving shaft, sheave is contained on the driven shaft, it is characterized in that: the diameter two ends of driving wheel respectively have an elongated slot; Slide blocks and spacing sheave also are housed on the driving shaft, and spacing sheave maintains static, and has restraining groove above; There are two bearing pins at the slide blocks two ends, also can slide therein in two elongated slots of embedding driving wheel, and one of them bearing pin one end stretches in the groove of sheave, and the other end stretches in the restraining groove of spacing sheave.

The restraining groove of spacing sheave is that annulus is cut off the D shape that the back forms, and as the technological scheme of the best, the horizontal edge of D shape restraining groove from the ratio of the perpendicular distance in the center of circle and circle radius is

The utility model also can be established the locking arc on driving shaft, driving shaft drives the locking arc and rotates.

In the utility model, bearing pin is not to be fixed on the driving wheel, but is fixed on the slide blocks, does translational motion when making circular movement again, so the distance of bearing pin and driving shaft changes, and its linear velocity also is constantly to change; And the track of slide block translational motion depends on the shape of restraining groove, when restraining groove is D shape, can control the translation of bearing pin, makes sheave carry out uniform rotation.

Description of drawings

Fig. 1 is the structural representation of Geneva mechanism in the prior art.

Fig. 2 is the schematic representation of sheave among Fig. 1.

Fig. 3 is the schematic representation of driving wheel and locking arc among Fig. 1.

Fig. 4 is a structural representation of the present utility model.

Fig. 5 is the schematic representation of sheave among Fig. 4.

Fig. 6 is the schematic representation of locking arc among Fig. 4.

Fig. 7 is the schematic representation of slide blocks among Fig. 4.

Fig. 8 is the schematic representation of driving wheel among Fig. 4.

Fig. 9 is the schematic representation of spacing sheave among Fig. 4.

Embodiment

Referring to Fig. 1, Fig. 2, Fig. 3.In the prior art, establish driving wheel 13 and locking arc 17 on the driving shaft 11, establish sheave 14 on the driven shaft 12; Driving wheel 13 has bearing pin 15, is contained on the driving wheel by lining 16, and sheave 14 is provided with groove 18, and bearing pin 15 stretches in the groove 18; When driving shaft 11 rotates, drive driving wheel 13 and rotate, promote sheave 14 by bearing pin 15 and rotate, during the driving wheel uniform rotation, sheave is not uniform rotation.

Referring to Fig. 4 to Fig. 9.Geneva mechanism of the present utility model comprises driving shaft 21, and driven shaft 22 is equipped with sheave 24 on the driven shaft, and driving shaft is equipped with spacing sheave 29, driving wheel 23, slide blocks 28, locking arc 27 successively, and wherein spacing sheave 29 is fixed, and can not rotate with driving shaft; Driving wheel 23 and locking arc 27 can rotate with driving shaft 21, and the diameter two ends of driving wheel respectively have an elongated slot 231; Respectively there is a pin-and-hole at the slide blocks two ends, two bearing pin 25 length differences, and short pin shaft connects slide blocks 28 and driving wheel 23, has strong market potential axle except that connecting slide blocks and driving wheel, also stretches in spacing sheave 29 and the sheave 24; Spacing sheave is provided with restraining groove 291, and the shape of restraining groove 291 is that annulus is cut off the D shape that the back forms, and A is the center of circle among the figure, and B is the central point on ring limit, and C is the central point of horizontal edge, $\mathrm{AC}:\mathrm{AB}=1:\sqrt{2};$ Axle one end of having strong market potential snaps in the restraining groove 291, and the other end stretches in the groove 241 of sheave 24.

In the present embodiment, when driving shaft 21 rotates, spacing sheave 29 is motionless, driving wheel 23 rotates thereupon, slide blocks 28 and bearing pin 23 are made circular movement on the one hand, are subjected to the restriction of restraining groove 291 on the other hand, do translational motion again, therefore the linear velocity of bearing pin changes, and can promote sheave 24 and do uniform rotation.

Claims (3)

1. a Geneva mechanism comprises driving shaft, driven shaft, driving wheel and sheave, and driving wheel is contained on the driving shaft, and sheave is contained on the driven shaft, it is characterized in that: the diameter two ends of driving wheel respectively have an elongated slot; Slide blocks and spacing sheave also are housed on the driving shaft, and spacing sheave maintains static, and has restraining groove above; There are two bearing pins at the slide blocks two ends, also can slide therein in two elongated slots of embedding driving wheel, and one of them bearing pin one end stretches in the groove of sheave, and the other end stretches in the restraining groove of spacing sheave.

2. Geneva mechanism as claimed in claim 1 is characterized in that: the restraining groove of described spacing sheave is that annulus is cut off the D shape that the back forms.

3. Geneva mechanism as claimed in claim 2 is characterized in that: the horizontal edge of D shape restraining groove from the ratio of the perpendicular distance in the center of circle and circle radius is

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