CN103470646A - Eccentric crossed-groove ball cage type constant-velocity universal joint - Google Patents

Abstract

The invention relates to an eccentric crossed-groove ball cage type constant-velocity universal joint. The eccentric crossed-groove ball cage type constant-velocity universal joint comprises a transmission shaft, a bell-shaped shell, a plurality of steel balls, an eccentric retainer, a star-shaped sleeve and a steel wire baffle ring, wherein the steel balls, consisting of three large steel balls and three small steel balls, are crossed and equidistantly arranged in the eccentric retainer in sequence; six channel sections of the bell-shaped shell and the star-shaped sleeve corresponding to the steel balls are crossed and equidistantly arranged in sequence; eccentric distances in the same size along the opposite directions are arranged between the centers of channels and the centers of window holes of the eccentric retainer; the eccentric distances in the same size along the opposite directions are arranged between the centers of the inner and outer spherical surfaces of the eccentric retainer and the centers of the window holes of the eccentric retainer. The eccentric crossed-groove ball cage type constant-velocity universal joint has the advantages that channel eccentricity with a traditional structure is changed into spherical surface concentricity; a concentric retainer with the traditional structure is changed into a retainer with inner and outer spherical eccentricity; three small balls are used for adjusting an angle, and three large balls are used for transferring force; motion and torque can be stably, flexibly, reliably and accurately transferred; the eccentric crossed-groove ball cage type constant-velocity universal joint is compact in structure, low in friction coefficient and high in bearing capacity.

Description

Eccentric crossed grooves rzeppa universal joint

Technical field

The present invention relates to a kind of coupling, especially relate to a kind of eccentric crossed grooves rzeppa universal joint.

Background technique

The rzeppa universal joint of conventional construction is inner ball surface and the retainer outer spherical surface of outer race, the outer spherical surface of star sleeve and the inner ball surface of retainer be totally 4 concentric sphericals, this center overlaps with the diaxon intersection point, outer race and star sleeve all circumferential six equally have in six on sphere separately, outer channel, and raceway groove center and its sphere centre all have an equal and opposite in direction separately, the throw of eccentric of opposite direction, and six steel ball sizes all equate, although geometrical principle is correct, but known through use result for many years, above-mentioned conventional construction has following deficiency: 1) due to the bias of outer race and star sleeve raceway groove and its sphere, cause raceway groove end walls thickness ununiformity, make the wall thickness thin location very easily produce and first wear and tear and lost efficacy, 2) because wall unevenness very easily produces heat-treated sturcture inequality, distortion and defects i.e.cracks, 3) due to six steel ball in the same sizes, its size and dimension positional error is had relatively high expectations, also for machining and quality control, brought difficulty, 4) due to throw of eccentric and space layout reason, be difficult to arrange, make the intensity of retainer can not be guaranteed, be easy to first damage, and bearing capacity is low, if the amplification physical dimension causes weight to increase, bulky, cost improves.

Summary of the invention

The objective of the invention is to provide for the prior art deficiency a kind of rational in infrastructure, easy to make, eccentric crossed grooves rzeppa universal joint that bearing capacity is high.

The objective of the invention is to realize by following measures: a kind of eccentric crossed grooves rzeppa universal joint, it comprises transmission shaft, outer race, some steel balls, nonconcentric cage, star sleeve, Steel Cable Baffle Ring, it is characterized in that, described steel ball has three big steel balls, three small balls, three big steel balls, three small balls intersect successively decile and are arranged in nonconcentric cage, minute arrangements such as six raceway groove cross sections with the steel ball reply of bell cover and star sleeve also intersect successively, and raceway groove is concentric with sphere, raceway groove element line is all linarity to opposite direction at the maximum point place separately, all the other sections are circular arc, described raceway groove center and nonconcentric cage fenestra center are provided with equal and opposite in direction, the throw of eccentric of opposite direction, in nonconcentric cage, there is an equal and opposite in direction at the outer spherical surface center apart from its fenestra center respectively, the throw of eccentric of opposite direction, described six steel balls are positioned at six raceway grooves of outer race and star sleeve, by nonconcentric cage guiding corner, star sleeve is arranged on transmission shaft by spline, and by the circlip axially locating.

Compared with prior art, the eccentric crossed grooves rzeppa universal joint that has adopted the present invention to propose, there is following advantage: 1) change into sphere concentric by the raceway groove bias of conventional construction, in the concentric retainer of conventional construction is changed into, the retainer of outer spherical surface bias, change the steel ball of six same structures of conventional geometric and raceway groove into staggered form three large, three small balls, adjust angle with three beads, main by three large ball power transmissions, can not only be steady, flexibly, reliably and accurately transmit motion and torque, and compact structure, rationally, friction factor is low, transmission efficiency is high, bearing capacity is strong, 2), because retainer is eccentric, outer race and star sleeve raceway groove element wire shaped are that straight line and circular arc are combined, are conducive to direct precision forging moulding, are convenient to processing and detect, and have reduced cost of production, improve work efficiency.

The accompanying drawing explanation

Fig. 1 is that the embodiment that the present invention proposes is vertically just cuing open structural representation.

Fig. 2 is Fig. 1 embodiment horizontal section schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, embodiment is elaborated: in the figure of one embodiment of the present of invention shown in Fig. 1～Fig. 2, a kind of eccentric crossed grooves rzeppa universal joint, it comprises: transmission shaft 1, outer race 2, big steel ball 3, small ball 4, nonconcentric cage 5, star sleeve 6, Steel Cable Baffle Ring 7.Described big steel ball has three, small ball to have three, three big steel balls, three small balls intersect successively decile and are arranged in nonconcentric cage, minute arrangements such as six raceway groove cross sections with the steel ball reply of bell cover and star sleeve also intersect successively, and raceway groove is concentric with sphere, the plain line of raceway groove is all linarity to opposite direction at the maximum point place separately, and all the other sections are circular arc.Because the raceway groove center overlaps with sphere centre, nonconcentric cage is shaftless to load, is beneficial to the transmission of moment of torsion.Described raceway groove center and nonconcentric cage 5 fenestra centers are provided with the throw of eccentric of equal and opposite in direction, opposite direction, and there is an equal and opposite in direction at the internal and external spherical surfaces center of nonconcentric cage 5 apart from its fenestra center respectively, and the throw of eccentric of opposite direction, realize constant-speed transmission.Due to the also minute arrangement such as intersection successively of six fenestras of steel ball, six steel balls are positioned at six raceway grooves of outer race and star sleeve, with three small balls, adjust angles, three big steel ball power transmissions.The outer race inner ball surface contacts with the nonconcentric cage outer spherical surface, the star sleeve outer spherical surface contacts with the retainer inner ball surface, and steel ball contacts with outer race raceway groove, star sleeve raceway groove simultaneously, by nonconcentric cage guiding corner, star sleeve is arranged on transmission shaft by spline, and by circlip 7 axially locating.

The above has described embodiments of the present invention by reference to the accompanying drawings, and the structure that embodiment provides is not construed as limiting the invention, and in related domain, those skilled in the art make within the scope of the appended claims various distortion or revise all in protection domain.

Claims (1)

1. an eccentric crossed grooves rzeppa universal joint, it comprises transmission shaft, outer race, some steel balls, nonconcentric cage, star sleeve, Steel Cable Baffle Ring, it is characterized in that, described steel ball has three big steel balls, three small balls, three big steel balls, three small balls intersect successively decile and are arranged in nonconcentric cage, minute arrangements such as six raceway groove cross sections with the steel ball reply of bell cover and star sleeve also intersect successively, and raceway groove is concentric with sphere, raceway groove element line is all linarity to opposite direction at the maximum point place separately, all the other sections are circular arc, described raceway groove center and nonconcentric cage fenestra center are provided with equal and opposite in direction, the throw of eccentric of opposite direction, in nonconcentric cage, there is an equal and opposite in direction at the outer spherical surface center apart from its fenestra center respectively, the throw of eccentric of opposite direction, described six steel balls are positioned at six raceway grooves of outer race and star sleeve, by nonconcentric cage guiding corner, star sleeve is arranged on transmission shaft by spline, and by the circlip axially locating.

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