CN202418457U - Conical-surface friction differential transmission - Google Patents

Abstract

The utility model discloses a conical-surface friction differential transmission. A shell is internally provided with a cone sun wheel, three same cone planetary wheels, rotating arm shafts and an outer ring, wherein one end of each rotating arm shaft is arranged in a bearing hole at one end of the shell, and the other end of each rotating arm shaft is provided with a U-shaped rotating arm; one end of the transmission shaft is arranged at one end of the U-shaped rotating arm and in the bearing hole of the other end of the shell; the other end of the transmission shaft positioned in the U-shaped rotating arm is provided with the cone sun wheel; the two ends of the three rotating arm shafts with equal U-shaped rotating arms are respectively arranged in the bearing holes of the U-shaped rotating arms; each rotating arm shaft is provided with one cone planetary wheel, and is in friction transmission with an inner conical hole of the outer ring and the cone sun wheel; the outer ring is fixed on the shell; and the three same cone planetary wheels rotate around respective axis, and also revolute around the sun wheel. The conical-surface friction differential transmission disclosed by the utility model has the advantages that the power is transferred by friction, the processing is convenient, the equivalent friction coefficient is increased due to conical-surface contact, the transferring torque is increased, and after the contact surface is worn, the wear is compensated by axial translation of the planetary wheel.

Description

A kind of conical surface friction differential speed variator

Technical field

The utility model relates to a kind of speed changer, especially relates to a kind of conical surface friction differential speed variator.

Background technique

Speed changer is the gear drive that can change output shaft and input shaft velocity ratio, to satisfy under the different condition needs to tractive force and rotating speed.Gear generally adopts high-quality low-carbon alloy steel carburizing and quenching, and is very high to required precision, and manufacturing is complicated.Since transmission gear often be in continuous variation rotating speed and the load under carry out work; Gear teeth face receives the impact of impulsive load again; Cause gear (the particularly flank of tooth) to be easy to generate damage, as: gear wear, gear tooth fragmentation etc. often need more gear changing.

Summary of the invention

The purpose of the utility model is to provide a kind of conical surface friction differential speed variator; Sun gear and planet wheel are processed cone; And inner surface is processed the conical surface that can match with the planet wheel outer surface, then planet wheel with sun gear, be line with inner surface and contact, carry out transmission through friction; And the conical surface contact has increased equivalent coefficient of friction, and the moment of torsion of transmission is increased.

The technological scheme that the utility model adopts is:

Conical surface friction differential speed variator is a differential gear train, comprises housing, cone sun gear, three identical cone planet wheel, tumbler shaft and outer rings; Cone sun gear, three identical cone planet wheel, tumbler shaft and outer rings are housed in the housing, and tumbler shaft one end is installed in the bearing hole of housing one end, and the tumbler shaft the other end is provided with the U pivoted arm; Transmission shaft one end is installed in the bearing hole of U pivoted arm one end and the housing the other end; The transmission shaft the other end that is positioned at the U pivoted arm is equipped with the cone sun gear, and U pivoted arm five equilibrium is equipped with three tumbler shafts, and three tumbler shaft two ends are installed in respectively in the bearing hole of U pivoted arm; The cone planet wheel is housed respectively on the every tumbler shaft; The cone planet wheel respectively with female cone hole, outer ring and cone sun gear friction driving, the outer ring is fixed on the housing, three cone planet wheels are in the time of separately axle rotation; They are also around sun gear revolution, center transmission shaft line and the coaxial installation of pivoted arm center line.

Adopt the angular contact ball bearing supporting between said U pivoted arm two ends and the planet axis.

The beneficial effect that the utlity model has is:

1, circular cone friction differential speed variator is processed sun gear and planet wheel cone, inner surface is processed the conical surface that can match with the planet wheel outer surface, and is simple in structure, easily manufactured.

2, circular cone friction differential speed variator is processed sun gear and planet wheel cone, inner surface is processed the conical surface that can match with the planet wheel outer surface, has increased equivalent coefficient of friction, and the moment of torsion of transmission is increased.

3, circular cone friction differential speed variator can obtain different velocity ratios through fixed outer ring or sun gear.

4, circular cone friction differential speed variator is processed sun gear and planet wheel cone, inner surface is processed the conical surface that can match with the planet wheel outer surface; After producing wearing and tearing between outer ring, planet wheel and sun gear; Can be through changing planet axis upper bush, axial translation planet wheel, to reach the purpose of compensate for wear.

Description of drawings

Fig. 1 is the differential gear train schematic representation.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the conical surface differential speed changer structure schematic diagram that rubs.

Fig. 4 is a U pivoted arm structural drawing.

Fig. 5 is the A-A sectional view of Fig. 4 pivoted arm.

Among the figure: 1, cone sun gear; 2, cone planet wheel; 3, outer ring; 4, pivoted arm; 5, housing.

Embodiment

To combine accompanying drawing and embodiment that the utility model is further described below.

Like Fig. 1, Fig. 2, shown in Figure 3, the utility model conical surface friction differential speed variator is a differential gear train, comprises housing 5, cone sun gear 1, three identical cone planet wheels 2, tumbler shaft and outer rings 3; Cone sun gear 1, three identical cone planet wheels 2, tumbler shaft and outer rings 3 are housed in the housing 5; Tumbler shaft one end is installed in the bearing hole of housing 5 one ends; Support through deep groove ball bearing; The tumbler shaft the other end is provided with the U pivoted arm, and transmission shaft one end is installed in the bearing hole of U pivoted arm one end and housing 5 the other ends, supports through deep groove ball bearing; The transmission shaft the other end that is positioned at the U pivoted arm is equipped with cone sun gear 1, is connected through flat key between cone sun gear 1 and transmission shaft.U pivoted arm five equilibrium is equipped with three tumbler shafts 4; Three tumbler shaft 4 two ends are installed in respectively in the bearing hole of U pivoted arm, on the every tumbler shaft 4 cone planet wheel 2 are housed respectively, cone planet wheel 2 respectively with 3 female cone holes, outer ring and cone sun gear 1 friction driving; Outer ring 3 is fixed on the housing 5; Three cone planet wheels 2 are in the time of separately axle rotation, and they are also around the revolution of 1 sun gear, transmission shaft and the coaxial installation of tumbler shaft.

Adopt the angular contact ball bearing supporting between said U pivoted arm two ends and the planet axis 4.

If the friction factor of parallel surfaces is f, the tilt angle of conical surface is θ, then the equivalent coefficient of friction f of conical surface contact _vSatisfy

$f_v=\frac{v}{\cos \mathrm{\θ}}$

Therefore, when the circular cone contact surface positive pressure be N, when Line of contact midpoint cone radius is r, the moment of torsion that conical surface contact is transmitted

T _v＝f _v·N·r

Moment of torsion greater than horizontal plane contact transmission

T＝f·N·r

In epicyclic gear train, establishing cone sun gear 1 rotating speed is ω ₁, cone planet wheel 2 rotating speeds are ω ₂, outer ring 3 rotating speeds are ω ₃, the tumbler shaft rotating speed is ω ₄, cone planet wheel 2 and cone sun gear 1, with the mid point of the Line of contact of outer ring 3 be m, then the radius of cone sun gear is r here _1m, the radius of cone planet wheel is r _2m, the outer ring radius is r _3m, the velocity ratio of cone sun gear and outer ring then

For

$i_{13}^4=\frac{{\mathrm{\ω}}_1-{\mathrm{\ω}}_4}{{\mathrm{\ω}}_3-{\mathrm{\ω}}_4}=-\frac{r_{3m}}{r_{1m}}$

Negative sign shows cone sun gear 1 rotational speed omega ₁-ω ₄With outer ring 3 rotational speed omega ₃-ω ₄In the opposite direction.

In this conical surface friction speed variator, when outer ring 3 fixing, i.e. outer ring rotational speed omega ₃=0 o'clock,

$i_{14}=\frac{{\mathrm{\ω}}_1}{{\mathrm{\ω}}_4}=1+\frac{r_{3m}}{r_{1m}}$

When cone sun gear 1 fixing, i.e. cone sun gear rotational speed omega ₁=0 o'clock,

$i_{34}=\frac{{\mathrm{\ω}}_3}{{\mathrm{\ω}}_4}=1+\frac{r_{1m}}{r_{3m}}$

When outer ring 3 and cone sun gear 1 fixing, i.e. ω ₃≠ 0 and ω ₁≠ 0 o'clock, the velocity ratio of this train

For

$i_{13}^4=-\frac{r_{3m}}{r_{1m}}$

Negative sign shows cone sun gear 1 rotational speed omega ₁-ω ₄With outer ring 3 rotational speed omega ₃-ω ₄In the opposite direction.

After producing wearing and tearing between outer ring, planet wheel and sun gear, can be through changing planet axis upper bush, axial translation planet wheel, to reach the purpose of compensate for wear.

As shown in Figure 4, the pivoted arm and the output shaft of said conical surface friction differential speed variator are made integrated type.

As shown in Figure 5, be the sectional drawing of Fig. 4 pivoted arm, on disc face, be uniformly distributed with three axis holes that are used to install the cone planet wheel, an axis hole that is used to install transmission shaft is left in the center.

Above-mentioned embodiment is used for the utility model of explaining; Rather than the utility model limited; In the protection domain of the spirit of the utility model and claim,, all fall into the protection domain of the utility model to any modification and the change that the utility model is made.

Claims (2)

1. conical surface friction differential speed variator, it is characterized in that: conical surface friction differential speed variator is a differential gear train, comprises housing, cone sun gear, three identical cone planet wheel, tumbler shaft and outer rings; Cone sun gear, three identical cone planet wheel, tumbler shaft and outer rings are housed in the housing, and tumbler shaft one end is installed in the bearing hole of housing one end, and the tumbler shaft the other end is provided with the U pivoted arm; Transmission shaft one end is installed in the bearing hole of U pivoted arm one end and the housing the other end; The transmission shaft the other end that is positioned at the U pivoted arm is equipped with the cone sun gear, and U pivoted arm five equilibrium is equipped with three tumbler shafts, and three tumbler shaft two ends are installed in respectively in the bearing hole of U pivoted arm; The cone planet wheel is housed respectively on the every tumbler shaft; The cone planet wheel respectively with female cone hole, outer ring and cone sun gear friction driving, the outer ring is fixed on the housing, three cone planet wheels are in the time of separately axle rotation; They are also around sun gear revolution, transmission shaft and the coaxial installation of tumbler shaft.

2. a kind of conical surface friction differential speed variator according to claim 1 is characterized in that: adopt the angular contact ball bearing supporting between said U pivoted arm two ends and the planet axis.

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