CN213117121U - Composite hinge with three rotational degrees of freedom - Google Patents

Abstract

The utility model belongs to the field of mechanical engineering, and discloses a composite hinge with three rotational degrees of freedom, which comprises an upper lug, a lower lug, a cross shaft, a flange bearing, a snap spring, a cover plate, a spherical hinge shell, an angular contact ball bearing, a rotating shaft, an end cover and a screw; wherein two ends of the cross shaft extend into the upper lug bearing block to be connected with the bearing, and the other two ends extend into the lower lug bearing block to be connected with the bearing; the end part of the cross shaft is provided with a clamp spring for limiting the axial movement of the cross shaft; the spherical hinge shell is connected with the upper lug piece through a cover plate, an angular contact ball bearing is arranged in the spherical hinge shell, is connected with the rotating shaft and is fastened through an end cover; the invention enables the rotating shaft to rotate around the spherical hinge shell through the bearing, and the upper lug plate and the lower lug plate respectively rotate around the cross shaft through the bearing, thereby realizing the rotational freedom degree of three axes meeting at one point and forming the three-degree-of-freedom composite hinge. The invention meets most functions of the traditional spherical hinge, increases the swing range and obviously saves the manufacturing cost.

Description

Composite hinge with three rotational degrees of freedom

Technical Field

The utility model belongs to the mechanical engineering field especially relates to a compound hinge with three rotational degree of freedom

Background

In recent years, the parallel mechanism has increasingly attracted attention due to the advantages of high precision, no accumulated error, strong bearing capacity and quick dynamic response, and the operation precision, the bearing capacity and the moving range of the hinge as an important component of the parallel mechanism directly influence the service performance of the parallel platform. The ball hinge is a relatively complex hinge in processing and manufacturing, is generally applied to the joint of the driving part, and achieves the relative rotation of three axial degrees of freedom of the driving part and the driven part while connecting the driving part and the driven part. The traditional ball hinge is a spherical pair of a movable ball head and a fixed ball socket, is limited by the structure of the traditional ball hinge, and has the problems of high manufacturing difficulty and higher processing cost.

Through the above analysis, the problems and defects of the prior art are as follows: the traditional ball hinge is a spherical pair of a movable ball head and a fixed ball socket and serves as a revolute pair capable of performing three-degree-of-freedom rotary motion, three rotating shafts of the traditional ball hinge are perpendicular to each other in pairs and intersect at one point, but due to factors such as manufacturing and installation errors, the center of the ball head of the traditional ball hinge is not located at the center of the ball socket, so that the three rotating shafts cannot accurately intersect at one point, and due to the special structures of the movable ball head and the fixed ball socket, the traditional ball hinge cannot bear large reverse axial force, and the working space of the movable ball head is limited. Because the traditional spherical hinge has higher requirement on manufacturing precision and higher processing difficulty, the cost is higher.

The difficulty in solving the above problems and defects is: the difficulty of solving traditional ball pivot defect mainly lies in how to design a simple structure, and two liang of verticals of three axis of rotation, the composite construction of being convenient for installation and dismantlement maintenance, this structure should still be able to bear great reverse axial force in addition, compensaties traditional ball pivot not enough.

The significance of solving the problems and the defects is as follows: the novel composite hinge is simple in structure, mainly comprises a traditional Hooke hinge and a composite spherical hinge shell, the two parts are relatively independent, the damaged parts are convenient to disassemble and maintain, the double bearing structure in the spherical hinge shell can enable the novel composite hinge to have the capacity of bearing larger reverse axial force, and the lower manufacturing cost has a good replacement effect on the traditional spherical hinge.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a compound hinge with three rotational degree of freedom.

The utility model discloses a realize like this, a compound hinge with three rotational degree of freedom, it mainly includes hooke hinge and compound spherical hinge shell two parts, and hooke hinge cross axle center is crossed to compound spherical hinge shell rotation axis, and three rotation axis intersects in a bit.

Further, the compound hinge with three rotational degrees of freedom further comprises: the composite hinge comprises an upper lug, a lower lug, a cross shaft, a flange bearing, a clamp spring, a cover plate, a spherical hinge shell, an angular contact ball bearing, a rotating shaft, an end cover and a screw; two ends of the cross shaft extend into the upper lug bearing block to be connected with the bearing, and the other two ends extend into the lower lug bearing block to be connected with the bearing; a clamp spring is arranged at the end of the cross shaft and used for limiting the axial movement of the cross shaft; the spherical hinge shell is connected with the upper lug piece through the cover plate, the angular contact ball bearing is arranged in the spherical hinge shell, is connected with the rotating shaft and is fastened through the end cover.

Furthermore, the cross shaft is axially limited with the flange bearing through a shaft shoulder and a clamp spring of the cross shaft, and the clamp spring is arranged in a groove formed in the shaft end of the cross shaft.

Furthermore, the flange bearing limits the bearing and the lug through the flange of the bearing and the counter bore of the lug bearing seat.

Furthermore, the cover plate is fixed at the end part of the upper lug plate through a screw, and bosses are distributed on one side of the cover plate and used for axially limiting the bearing outer ring.

Furthermore, the spherical hinge shell is fixed on one side of the cover plate through a screw and is sleeved with the boss of the cover plate.

Further, the rotating shaft is arranged in the spherical hinge shell.

Furthermore, two ends of a shaft shoulder at the middle section of the rotating shaft are provided with angular contact ball bearings which are arranged face to face, and the end face of the shaft shoulder is attached to the end face of the bearing.

Furthermore, the end faces of the other sides of the two angular contact ball bearings are respectively attached to the end faces of the cover plate boss and the end cover boss and used for axial limiting of the bearings;

the end cover is fixed with the other end of the spherical hinge shell through a screw, and the end cover boss is sleeved with the spherical hinge shell.

Combine foretell all technical scheme, the utility model discloses the advantage that possesses and positive effect are: the utility model discloses on traditional hooke hinge basis, but at the rotatory structure of auricle tip design one kind single degree of freedom, realized three degrees of freedom rotary motion, and three rotation axes intersect in a bit.

The invention has novel and simple structure, low cost and good replacement effect on the traditional spherical hinge; through the symmetry of the structure, the large-range rotation of the relative three axial directions of the parts connected at the two ends of the three-degree-of-freedom composite hinge is realized, and the three rotating shafts meet at one point. The lug and the cross shaft are fastened by adopting the structure of the clamp spring and the shoulder of the stepped shaft, so that the axial movement of the cross shaft and the lug is prevented. The double-angle contact ball bearing structure is adopted, the structural stability of the composite hinge is effectively improved, and the hinge can bear larger bidirectional axial force through the reasonable arrangement of the diagonal contact ball bearings; threaded holes are distributed at the end part of the rotating shaft, and the connecting performance is strong.

The invention has simple structure, can be quickly assembled and disassembled, and is convenient for replacing the damaged parts.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a compound hinge with three rotational degrees of freedom according to an embodiment of the present invention;

fig. 2 is a schematic view of a cross-shaped shaft portion mounting structure provided by an embodiment of the present invention;

FIG. 3 is a schematic view of a mounting structure of a spherical hinge housing according to an embodiment of the present invention;

FIG. 4 is a schematic view of a cover plate structure according to an embodiment of the present invention;

FIG. 5 is a cross-shaft configuration diagram provided by an embodiment of the present invention;

in the figure: 1. an end cap; 2. a spherical hinge housing; 3. a cover plate; 4. a lower ear piece; 5. a flange bearing; 6. a cross shaft; 7. an upper lug plate; 8. a clamp spring; 9. a screw; 10. angular contact ball bearings; 11. a rotating shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

To the problem that prior art exists, the utility model provides a compound hinge with three rotational degree of freedom, it is right to combine the figure below the utility model discloses do detailed description.

As shown in fig. 1 to 5, a composite hinge with three rotational degrees of freedom provided in an embodiment of the present invention mainly includes a hooke hinge and a composite spherical hinge housing, where an upper tab and a lower tab form a traditional hooke hinge through a cross shaft and a bearing installed on a tab bearing seat, the hooke hinge has two degrees of freedom, two rotation axes of the hooke hinge are located at the center of the cross shaft, the composite spherical hinge housing is installed at an end of the upper tab through a connecting member cover plate, a double bearing structure is disposed inside the spherical hinge housing, the rotation axes rotate through the bearings, the rotation centers coincide with the axes of the spherical hinge housing, and pass through the center of the cross shaft, so as to form a composite hinge with three degrees of freedom, where the three rotation centers. The invention specifically comprises the following steps: the end cover comprises an end cover 1, a spherical hinge shell 2, a cover plate 3, a lower lug 4, a flange bearing 5, a cross shaft 6, an upper lug 7, a clamp spring 8, a screw 9, an angular contact ball bearing 10 and a rotating shaft 11.

The cross shaft 6 extends into two ends of the lower lug plate 4, the flange bearing 5 is matched with the cross shaft 6, an inner ring of the cross shaft 6 is matched with a shaft shoulder of the cross shaft 6, the clamp spring 8 is clamped into a groove at the end part of the cross shaft 6, the cross shaft 6 is prevented from axially jumping, the other two ends of the cross shaft 6 extend into two ends of the upper lug plate 7 and are also matched with the flange bearing 5 and the clamp spring 8, the cross shaft 6 is prevented from axially jumping, the center of the cross shaft 6 is thickened, and the bearing capacity of the structure is enhanced.

Two angular contact ball bearings 10 are respectively sleeved at two ends of a shaft shoulder of a rotating shaft 11, inner rings of the angular contact ball bearings 10 are attached to two ends of the shaft shoulder of the rotating shaft 11 and used for limiting axial movement of the rotating shaft 11, an end cover 11 is fixed with a spherical hinge shell 2 through a screw 9, a boss end face of the end cover 1 is attached to an outer ring of the angular contact ball bearing 10 and used for limiting axial movement of the angular contact ball bearing 10, a boss end of a cover plate 3 is matched with the spherical hinge shell, a boss end face of the cover plate is attached to an outer ring of the angular contact ball bearing 10 and used for limiting axial movement of the angular contact ball bearing 10, one end of the cover plate 3 without a boss is matched with an end face of an upper.

The method for specifically installing the composite hinge with three rotational degrees of freedom comprises the following steps:

and concentrically mounting the flange bearing and the lug bearing seat until the end face of the flange is completely attached to the counter bore of the lug bearing.

And (3) respectively penetrating the two ends of the cross shaft into lug plates provided with flange bearings until the groove reserved for installing the clamp spring at the end part of the cross shaft completely extends out of the end surface of the flange bearing, and clamping the clamp spring into the groove for fixing.

Two angular contact ball bearings are arranged on two sides of a shaft shoulder of a rotating shaft face to face until an inner ring of the bearing is completely attached to the end face of the shaft shoulder of the rotating shaft, and the structure is concentrically arranged in a spherical hinge shell.

And fixing the end cover at the end part of the spherical hinge shell through a screw until the end surface of the boss of the end cover is completely attached to the outer ring of the angular contact ball bearing.

And (3) the other end of the spherical hinge shell is arranged on the surface of the cover plate with the boss until the boss completely extends into the spherical hinge shell, and the end surface of the boss of the end cover is completely attached to the outer ring of the angular contact ball bearing.

And fixing the end cover provided with the spherical hinge shell and the upper lug by using screws until the end faces are completely attached and the four sides are parallel and level. The full assembly is attempted as shown in fig. 1.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.

Claims (10)

1. The utility model provides a compound hinge with three rotational degree of freedom, a serial communication port, compound hinge with three rotational degree of freedom divide into hooke hinge and compound spherical hinge shell two parts, upper and lower auricle passes through the cross and installs the bearing in the auricle bearing frame and constitutes traditional hooke hinge, hooke hinge has two rotational degree of freedom, its two rotation axis are located the cross center, compound spherical hinge shell passes through the connecting piece apron and installs in upper auricle tip, the duplex bearing structure is arranged in spherical hinge shell, the rotation axis passes through the bearing rotation, the rotation center coincides with spherical hinge shell axis, cross the cross center, form and have three degree of freedom, three rotational center intersects the compound hinge of a bit.

2. The compound hinge with three rotational degrees of freedom of claim 1, wherein the single degree of freedom rotation structure is a cross.

3. The compound hinge with three degrees of rotational freedom of claim 1, further comprising: the composite hinge comprises an upper lug, a lower lug, a cross shaft, a flange bearing, a clamp spring, a cover plate, a spherical hinge shell, an angular contact ball bearing, a rotating shaft, an end cover and a screw; two ends of the cross shaft extend into the upper lug bearing block to be connected with the bearing, and the other two ends extend into the lower lug bearing block to be connected with the bearing; a clamp spring is arranged at the end of the cross shaft and used for limiting the axial movement of the cross shaft; the spherical hinge shell is connected with the upper lug piece through the cover plate, the angular contact ball bearing is arranged in the spherical hinge shell, is connected with the rotating shaft and is fastened through the end cover.

4. A compound hinge with three rotational degrees of freedom according to claim 3, characterised in that the cross is axially limited by the shoulder of the cross and a circlip arranged in a pre-cut groove at the end of the cross.

5. A compound hinge with three rotational degrees of freedom as claimed in claim 3 wherein the flange bearing provides bearing and tab restraint through the bearing's own flange and the counterbore of the tab bearing mount.

6. A compound hinge with three rotational degrees of freedom as claimed in claim 3 wherein the cover plate is fixed to the end of the upper lug by screws and has bosses on one side for axial retention of the bearing cup.

7. A compound hinge with three degrees of rotational freedom as claimed in claim 3 wherein said spherical hinge housing is secured to one side of the cover plate by screws to engage the boss of the cover plate.

8. A compound hinge with three rotational degrees of freedom according to claim 3, characterised in that the rotation axis is placed inside a spherical hinge housing.

9. The compound hinge with three rotational degrees of freedom as claimed in claim 3, wherein angular contact ball bearings are installed at both ends of the shaft shoulder at the middle section of the rotational shaft, and the end face of the shaft shoulder is attached to the end face of the bearing.

10. The compound hinge with three rotational degrees of freedom as claimed in claim 3, wherein the other side end faces of the two angular contact ball bearings are respectively attached to the end faces of the cover plate boss and the end cover boss for axial limiting of the bearings;

the end cover is fixed with the other end of the spherical hinge shell through a screw, and the end cover boss is sleeved with the spherical hinge shell.

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