CN102537247A - Conical surface friction differential transmission - Google Patents

Abstract

The invention discloses a conical surface friction differential transmission. A conical sun wheel, three same conical planetary wheels, a rotating arm shaft and an outer ring are arranged in a casing, wherein one end of the rotating arm shaft is arranged in a bearing hole in one end of the casing; a U-shaped rotating arm is arranged at the other end of the rotating arm shaft; one end of a driving shaft is arranged in a bearing hole in one end of the U-shaped rotating arm and in the bearing hole in the other end of the casing; the conical sun wheel is arranged at the other end of the driving shaft positioned in the U-shaped rotating arm; two ends of three equational rotating arm shafts of the U-shaped rotating arm are respectively arranged in the bearing hole of the U-shaped rotating arm; the conical planetary wheels are respectively arranged on the rotating arm shafts and drive with an inner conical hole of the outer ring and the conical sun wheel by friction; the outer ring is fixed on the casing; the three conical planetary wheels rotate around respective shafts and simultaneously revolve around the sun wheel; and the driving shaft and the rotating arm shaft are coaxially arranged. According to the conical surface friction differential transmission disclosed by the invention, the power is transmitted by friction and the convenience for processing is realized; in addition, an equivalent coefficient of friction is increased by increasing the contact of the conical surface, so that the transmitted torque is increased. When the contacted surface is worn, the wear is complemented by axially translating the planetary wheels.

Description

Conical surface friction differential speed variator

Technical field

The present invention relates to a kind of speed changer, especially relate 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 object of the present invention 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 present invention 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 present invention 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 present invention is further described below.

Like Fig. 1, Fig. 2, shown in Figure 3, conical surface of the present invention 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

$f_v=\frac{f}{\cos \mathrm{\θ}}$

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 present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

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.

Images