CN1117936C - Moving set with three ball-and-spigot assemblies - Google Patents

Abstract

The present invention relates to a moving pair with three sphere pins, which comprises an outer shaft and an inner shaft. Two parallel three-pin seats are arranged on the inner shaft, and each of the three-pin seats is in a hexagon. Pin shafts are arranged on three edges of the hexagon, the three edges of the hexagon are mutually spaced at 120 degrees, a bearing is arranged on each pin shaft, and a ball ring is arranged outside the bearing. The two three-pin seats axially and respectively pass through a shaft shoulder, a sleeve barrel and a screw nut of a shaft end to be fixed on the inner shaft. The present invention has the advantages of simple and compact structure, low friction coefficient, high driving efficiency, little abrasion, etc., and torque can be transmitted effectively. Thus, the present invention can be widely used for various vehicle systems, mining machines, aviation machines, precision mechanisms, etc.

Description

A kind of moving set with three ball-and-spigot assemblies

Technical field

The present invention relates to a kind of moving set with three ball-and-spigot assemblies, be used to connect the kinematic pair of two members that relatively move, belong to the mechanical transmissioning technology field.

Background technique

Sliding pair is a kind of kinematic pair common in mechanism or the machine, is used to realize moving between two mechanisms, guiding and moment transmission.Sliding pair generally is made up of guide passage and slide block.Though form is simple, structure is different, and different structural type has determined the transmission efficiency that kinematic pair is different.Fig. 1 has provided the general mechanical model of sliding pair.Wherein:

(1) d is that sliding pair characterizes size.In view of the sliding pair geometrical shape in the actual engineering differs, so with the sign dimension definitions of sliding pair be: with external force F line of action and the formed plane of ox axle is the cross section longitudinal size that section is obtained on sliding pair.

(2) L is the sliding pair equivalent separation, is the distance between supported on both sides point O, the B.

(3) F is an active force, and the equivalent action point of power is that A (x, y), represent with the angle α of its line of action and ox axle forward by forced direction.

(4) f is a friction factor.

According to this general model, the transmission efficiency that can calculate kinematic pair is: $\mathrm{\η}=1-\frac{f}{L\cos \mathrm{\α}}\left\{\right|\sin \mathrm{\α}(x-L+f\frac{d}{2})-y\cos \mathrm{\α}|+|y\cos \mathrm{\α}-\sin \mathrm{\α}(x+f\frac{d}{2})\left|\right\}$

Transmission efficiency is an important evaluation index of sliding pair transmission performance, generally wishes that all designed sliding pair its efficient in transmission process is the bigger the better.Document (Jiang Shengyuan, Deng ancestor congruence is based on the sliding pair design method of transmission efficiency, mechanical transmission, 2000, the 24th volume, the 4th phase, the 3rd～5 page) studies show that, when active force F satisfies certain condition, transmission efficiency and L are irrelevant, η=1-f|tan α |, promptly only be subjected to the influence of the direction angle alpha of friction factor f and power.

In order to improve the transmission efficiency of sliding pair, must reduce friction factor as far as possible, reduce the working angle of power.And the effect of external force often is subjected to the restriction of kinematic pair service condition, so reduce friction factor, improving transmission efficiency is more practicable method.

Traditional sliding type spline structure is simple, but the friction factor that endwisely slips is big, and transmission efficiency is low.When transmitting torque, frictional force can change along with the torque difference.Based on the design principle of above raising transmission efficiency, in order to reduce friction, carry out architecture advances, in the part spline, install ball, the residue spline is as bead returning groove, and the bead returning groove radius is bigger, alternate layout with work nest.Sliding friction between outer ring and the interior axle becomes rolling friction, and the spline structure with respect to traditional has improved transmission efficiency, but in order to prevent that ball from ejecting chute, require bigger axial dimension and radial dimension, and the chute design is complicated, practicability was relatively poor when shift motion was big.

Summary of the invention

The present invention seeks to design a kind of moving set with three ball-and-spigot assemblies, make it simple in structure, and have high pass efficient, low wearing and tearing and long lifetime, effective in the engineering practical application, practical, can replace traditional sliding pair.

The moving set with three ball-and-spigot assemblies of the present invention's design, comprise outer shaft and interior axle, two three key seats side by side are housed on interior axle, each three key seat is a hexagon, hexagonal three apart from one another by on 120 ° the limit bearing pin being housed, bearing is housed on the bearing pin, and bearing is equipped with ball outward, and two three key seats are in axially being fixed on by the shaft shoulder, sleeve and shaft end nut respectively on the axle.

The moving set with three ball-and-spigot assemblies of the present invention's design, have simple and compact for structure, friction factor is low (only about about 0.003), transmission efficiency height, wearing and tearing advantage such as little, and transmitting torque can be widely used in various Vehicular systems, mining machinery, aviation machine, precision optical machinery etc. effectively.

Description of drawings

Fig. 1 is the general mechanical model of sliding pair.

Fig. 2 is a novel moving set with three ball-and-spigot assemblies structural representation of the present invention.

Fig. 3 is the A-A sectional view of Fig. 2.

Among Fig. 2 and Fig. 3, the 1st, interior axle, 2 is three key seats, the 3rd, sleeve, the 4th, bearing pin, the 5th, shaft end nut, the 6th, outer shaft, the 7th, bearing, the 8th, ball.

Embodiment

As shown in Figure 2, the moving set with three ball-and-spigot assemblies of the present invention's design, comprise outer shaft 6 and interior axle 1, two three key seats 2 side by side are housed on interior axle, each three key seat is a hexagon, hexagonal three apart from one another by bearing pin 4 is housed on 120 ° the limit, bearing 7 is housed on the bearing pin, bearing be equipped with outward 8, two three key seats of ball in axially being fixed on by the shaft shoulder, sleeve 3 and shaft end nut 5 respectively the axle on.

Below in conjunction with Fig. 2, describe the working principle of sliding pair of the present invention in detail: moving set with three ball-and-spigot assemblies is used to connect outer shaft 6 and interior axle 1, guarantees relatively moving between the two.Outer shaft 6 is a hollow shaft, and the inner face design has three cylindrical chutes along axial direction.Two group of three key seat 2 is installed side by side, by the shaft shoulder, sleeve 3 and shaft end nut 5 axially locating on the interior axle 1.Every group three key seat evenly installed 4, three balls 8 of 3 bearing pins in a circumferential direction and is contained on the bearing pin by ball bearing 7.Rolling by ball and chute contacts, and realizes moving to axial between outer shaft and the interior axle.Interior axle upper edge axial direction and two groups of balls of column distribution guarantee in the moving process self-locking not to take place.

Claims (1)

1, a kind of moving set with three ball-and-spigot assemblies, it is characterized in that this sliding pair comprises outer shaft and interior axle, two three key seats side by side are housed on interior axle, each three key seat is a hexagon, hexagonal three apart from one another by on 120 ° the limit bearing pin being housed, bearing is housed on the bearing pin, and bearing is equipped with ball outward, and two three key seats are in axially being fixed on by the shaft shoulder, sleeve and shaft end nut respectively on the axle.

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