CN2306359Y - Ball telescopic shaft - Google Patents

Abstract

The utility model belongs to a ball telescopic shaft. The utility model has the structure that a cylindrical body is used as the periphery of the utility model, the outer wall surface of the cylindrical body is provided with flanges, and the inner wall surface of the cylindrical body is provided with an internal key of a shoulder-shaped ball bed; a key shaft is sheathed in the middle of the inside of the cylindrical body, and an external key of the shoulder-shaped ball bed is arranged on the neighborhood of the center of the key shaft; two big groups of balls are distributed between an internal key of the cylindrical body and an external key of the key shaft; when the key shaft flexes, the balls can roll along travel range; the utility model adopts a two-key system design or a three-key design. The friction and the abrasion of the utility model is smaller. The utility model can be used in mechanical products, wherein, the shaft of which need flexe with high speed and the friction and the abrasion of which are small.

Description

The ball telescopic shaft

This model utility belongs to a class of mechanical range.

The function of this ball telescopic shaft is identical with the function of the splined shaft of widely applying now (with axle sleeve), major part has cylindrical shell, key axle on the structure, the former has internal key, the latter has external key, vacate position placement ball owing to reducing bond number relatively, make its frictional force reduce greatly, and wearing and tearing are also little, are suitable for a high speed and stretch and the unsuitable big machinery use of friction than splined shaft.Present patent application document, as Chinese patent application number 91103314.9 (publication number CN1066717A). and Chinese patent application 94117414.X (publication number CN1122423A) once disclosed and above-mentioned close design, but disclose insufficient, it is little that structure divides two joints to cause intensity, the Cross section Design of pearl bed is not good, be connected the aspect with other parts shortcoming is arranged. and only do not open up 3 key systems in 2 key system stages, tube structure is unfavorable for manufacturing.

The purpose of this utility model is that the ball telescopic shaft in the document is improved design, provide a kind of in intensity, connection, closely, superior practicality aspect the processing, the ball telescopic shaft of 2 or 3 key systems.

For achieving the above object, solution is to improve cylindrical shell and key axle, and adds system's example design with 3 key systems, and supporting again auxiliary is specific as follows.

The improvement of cylindrical shell is: adopt the design of 2 key systems or 3 key systems; Shoulder shape pearl bed radian in the cross section of the internal key in its key chamber strengthens and reaches 160 °-180 °; The outside sets up a flange, flange that 4 or 6 holes are arranged, and is used for being connected with the parts that link to each other; Be regardless of two joints and only be a joint, two-end structure opens wide, and can know and see internal key; The cross section of the open-work shape approximation key axle at the saturating wall of its grade pearl position, but big a bit to stay micro-gap.

The improvement of key axle is: adopt 2 keys to make or the design of 3 key systems; Shoulder shape pearl bed radian in the cross section of its external key strengthens and reaches 140 °-160 °; The inner of stretching into cylindrical shell is provided with double-screw bolt, pin-and-hole structure, with significantly packing ring, nut, cotter pin form the stroke termination structure; The outer end is designed to sleeve and is used for being connected with working shaft with the pin-and-hole structure, and perhaps outer end and working shaft are directly made one.

Supporting lid, interior usefulness are covered thoroughly, carry out supporting design by 2 key systems or 3 key systems, and its open-work shape approximation is joined the cross section of key axle, but big a bit to stay micro-gap.

Structure of the present utility model as shown in drawings, the design of the 2 or 3 key systems of employing, the periphery part is a cylindrical shell, its outer wall is provided with flange, its interior wall construction is divided into the right button chamber of internal key of the saturating wall of left button chamber, block bead, hollow cavity, the saturating wall of block bead, the shoulder shape pearl bed of the internal key of cavity, shoulder shape pearl bed in proper order, and its cavity has screw thread, and the screw of the key end that is opened on the left button chamber is arranged, the screw that the key end that is opened on the right button chamber is arranged, solid lubrication fat is daubed at the hollow cavity of cylindrical shell and the pearl bed position of internal key when assembling; It is key axles that the inner barrel center is nested with parts, and its fastening piece that stretches into an end of inner barrel is significantly packing ring, nut, cotter pin, partially in most of shaft part be provided with the external key of shoulder shape pearl bed, the outer end of exposing is provided with sleeve and pin-and-hole structure; Place 2 big groups totally 16 or 24 balls between the key of cylindrical shell and key axle and the key, each big component 4 or 6 groups, each group is 2; Saturating lid is fastened on the spiral shell breast of key end in the right button chamber of cylindrical shell with hex head screw; In be fastened on the screw of key end in the left button chamber of cylindrical shell with sunk screw with saturating lid; Stifle forms sealing with the cavity end face that thread forms is fastened on cylindrical shell.The effect of the saturating wall of the block bead of above-mentioned cylindrical shell position, saturating lid, the saturating lid of interior usefulness is to allow the key axle cross by stoping ball; Stifle is regardless of standard, and effect only is a safeguard function, and four concane gaps at its edge are used for knocking and make it degree of tightness.

The axle stroke is 1-1.5 a times of pearl stroke, is that a stroke equals the pearl stroke, and perhaps an axle stroke ratio pearl stroke increases pettiness, but at most should not be above 0.5 times.

The hollow cavity structure of cylindrical shell, its length should be more than 50% of pearl stroke.Distance between the effect of the hollow cavity pearl bed position of two keys that has been at interval again can weight reduction, and can also store a part of solid lubrication fat.

If key axle inscribed circle diameter is D, establishing ball diameter is X, concerns following formula: 2 key systems: $\frac{(D\×X)\×\mathrm{\π}}{8}\≈1.05X$ 3 key systems: $\frac{(D\×X)\×\mathrm{\π}}{12}\≈1.03X$

Above-mentioned coefficient (1.05 or 1.03) expression graduated arc is than the multiple of ball diameter.

In fact above-mentioned formula is only suitable for referencial use, determine and draw key shaft section incircle during design earlier, again circle is divided into 8 or 12 equal portions, paint ray with the center of circle respectively, try again on the outer five equilibrium ray of circle, to paint circle, make circle and justify and the key axle cut between the incircle tangent mutually, this circle diameter of a circle diameter that is ball so, if do not have ball, (because often its diameter amount gets the mixed decimal position) of this diameter on the market, so just regulated the ball of the bigger or smaller diameter of employing; After determining ball diameter, the size that designs key again is just clear and definite.

The utility model according to principle be: 1. all there are shoulder shape pearl bed, ball straight-line rolling between two pearl beds in the external key side of the internal key of cylindrical shell and key axle, thereby frictional force reduces.2. setting up the effect of two big group balls is to make balance between cylindrical shell and the key axle; The long more balance of hollow cavity is good more simultaneously, but should need in entire length.3. the axle stroke equals the pearl stroke in principle, but the axle stroke can increase pettiness, in order to making ball pearl bed to the greatest extent.

The advantage of this programme with effect is: in complementary design structure aspect other parts are connected, the i.e. sleeve of the flanged structure of cylindrical shell and key axle and pin-and-hole structure; Cylindrical shell is regardless of two joints and only is a joint intensity is improved, and also can make gear shaft and use; The cylindrical shell both ends open is convenient to machining; The pearl bed radian in the cross section of the key of cylindrical shell and key axle strengthens and improves tight performance; Though the 3 key system structure ball diameters of being opened up are more a little bit smaller than 2 key systems, 3 key system structure stresses are average tightr, and outside dimension is also a little bit smaller.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a kind of erection drawing of 1: 1 of 2 key system ball telescopic shafts.

Fig. 2 is that 1: 1 the A of Fig. 1 is to view.

Fig. 3 is 1: 1 the A-A sectional drawing of Fig. 1.

Fig. 4 is 1: 1 the B-B sectional drawing of Fig. 1.

Fig. 5 is that 1: 1 the B of Fig. 1 is to view.

Fig. 6 is 2: 1 the C-C sectional drawing of Fig. 1.

Fig. 7 is 2: 1 the D-D sectional drawing of Fig. 1.

Fig. 8 is a kind of erection drawing of 1: 1 of 3 key system ball telescopic shafts.

Fig. 9 is that 1: 1 the A of Fig. 8 is to view.

Figure 10 is 1: 1 the A-A sectional drawing of Fig. 8.

Figure 11 is 1: 1 the B-B sectional drawing of Fig. 8.

Figure 12 is that 1: 1 the B of Fig. 8 is to view.

Figure 13 is 2: 1 the C-C sectional drawing of Fig. 8.

Figure 14 is 2: 1 the D-D sectional drawing of Fig. 8.

Consult the embodiment of ball telescopic shaft shown in Figure 1, adopt the design of 2 key systems, the periphery part is 2 formula cylindrical shells (1), its outer wall construction is provided with flange, its interior wall construction is divided into the right button chamber of internal key of the saturating wall of left button chamber, block bead (1a), hollow cavity, the saturating wall of block bead (1a), the shoulder shape pearl bed of the internal key of cavity, shoulder shape pearl bed from left to right, wherein the cavity of left end has screw thread, the screw that the key end that is opened on the left button chamber is arranged, wherein right-hand member has the screw of the key end that is opened on the right button chamber, and solid lubrication fat is daubed at the hollow cavity of 2 formula cylindrical shells and the pearl bed position of internal key when assembling; It is 2 formula key axles (2) that the inside center of 2 formula cylindrical shells is nested with parts, the fastening piece (9) that wherein stretches into an end (left end) of 2 formula inner barrel is significantly packing ring, nut, cotter pin, most of shaft part is provided with the external key of shoulder shape pearl bed partially, and the outer end of exposing (right-hand member) is provided with sleeve and pin-and-hole structure; Place 2 big groups totally 16 balls (5) between the key of 2 formula cylindrical shells and 2 formula key axles and the key, each big component 4 group, each group is 2; 2 formulas are covered (3) are fastened on the key end in 2 formula cylindrical shell right-hand member right button chambeies with hex head screw (6) screw thoroughly; Be fastened on the screw of the key end in 2 formula cylindrical shell left button chambeies in 2 formulas with sunk screw (7) with saturating lid (4); Stifle (8) is fastened on the cavity end face of 2 formula cylindrical shell left ends with thread forms, forms the left end sealing.

Consult the embodiment of ball telescopic shaft shown in Figure 8, adopt the design of 3 key systems, the periphery part is 3 formula cylindrical shells (10), its outer wall construction is provided with flange, its interior wall construction is divided into the right button chamber of internal key of the saturating wall of left button chamber, block bead (10a), hollow cavity, the saturating wall of block bead (10a), the shoulder shape pearl bed of the internal key of cavity, shoulder shape pearl bed from left to right, wherein the cavity of left end has screw thread, the screw that the key end that is opened on the left button chamber is arranged, wherein right-hand member has the screw of the key end that is opened on the right button chamber, and solid lubrication fat is daubed at the hollow cavity of 3 formula cylindrical shells and the pearl bed position of internal key when assembling; It is 3 formula key axles (11) that 3 formula inner barrel centers are nested with parts, its fastening piece (9) that stretches into an end (left end) of 3 formula inner barrel is significantly packing ring, nut, cotter pin, most of shaft part is provided with the external key of shoulder shape pearl bed partially, and the outer end of exposing (right-hand member) is provided with sleeve and pin-and-hole structure; Place 2 big groups totally 24 balls (5) between the key of 3 formula cylindrical shells and 3 formula key axles and the key, each big component 6 group, each group is 2; 3 formulas are covered (12) are fastened on the key end in 3 formula cylindrical shell right-hand member right button chambeies with hex head screw (6) screw thoroughly; Be fastened on the screw of the key end in 3 formula cylindrical shell left button chambeies in 3 formulas with sunk screw (7) with saturating lid (13); Stifle (8) is fastened on the cavity end face of 3 formula cylindrical shell left ends with thread forms, forms the left end sealing.

Claims (8)

1, a kind of ball telescopic shaft, it is characterized in that the periphery part is cylindrical shell (1,10), its outer wall is provided with flange, its interior wall construction is divided into the right button chamber of internal key of the saturating wall of left button chamber, block bead (1a, 10a), hollow cavity, the saturating wall of block bead (1a, 10a), the shoulder shape pearl bed of the internal key of cavity, shoulder shape pearl bed in proper order, its cavity has screw thread, the screw that the key end that is opened on the left button chamber is arranged, the screw that the key end that is opened on the right button chamber is arranged, solid lubrication fat is daubed at the hollow cavity of cylindrical shell and the pearl bed position of internal key when assembling; It is key axle (2,11) that the inner barrel center is nested with parts, and its fastening piece (9) that stretches into an end of inner barrel is significantly packing ring, nut, cotter pin, partially in most of shaft part be provided with the external key of shoulder shape pearl bed, the outer end of exposing is provided with sleeve and pin-and-hole structure; Place 2 big groups totally 16 or 24 balls (5) between the key of cylindrical shell and key axle and the key, each big component 4 or 6 groups, each group is 2; Saturating lid (3,12) is fastened on the screw of key end in the right button chamber of cylindrical shell with hex head screw (6); In be fastened on the screw of key end in the left button chamber of cylindrical shell with sunk screw (7) with saturating lid (4,13); Stifle (8) forms sealing with the cavity end face that thread forms is fastened on cylindrical shell.

2, ball telescopic shaft according to claim 1 is characterized in that cylindrical shell (1,10) adopts 2 key systems or the design of 3 key systems, is regardless of two joints and only is a joint, and two-end structure opens wide, and the shoulder shape pearl bed radian in the cross section of the internal key in its key chamber reaches 160 °-180 °; A flanged structure is established in the outside, and flange has 4 or 6 holes; The cross section of the open-work shape approximation key axle at the saturating wall of its block bead position, but big a bit to stay the pettiness gap.

3, ball telescopic shaft according to claim 1 is characterized in that key axle (2,11) adopts 2 key systems or the design of 3 key systems, and the shoulder shape pearl bed radian in the cross section of its external key reaches 140 °-160 °; The inner of stretching into cylindrical shell is provided with double-screw bolt and pin-and-hole structure, with significantly packing ring, nut, cotter pin form the stroke termination structure; The outer end is designed to sleeve and is used for being connected with working shaft with the pin-and-hole structure, and perhaps outer end and working shaft are directly made one.

4, ball telescopic shaft according to claim 1 is characterized in that it is to carry out supporting design by 2 key systems or 3 key systems that lid (3,12) and interior usefulness are covered (4,13) thoroughly, and its open-work shape approximation is joined the cross section of key axle, but big a bit to stay the pettiness gap.

5, ball telescopic shaft according to claim 1 when it is characterized in that adopting the design of 2 key systems, should have in the part with 2 formula cylindrical shells (1), 2 formula key axles (2), 2 formulas of the design of 2 key systems and cover thoroughly in (3), 2 formulas with saturating lid (4).

6, ball telescopic shaft according to claim 1 when it is characterized in that adopting the design of 3 key systems, should have in the part with 3 formula cylindrical shells (10), 3 formula key axles (11), 3 formulas of the design of 3 key systems and cover thoroughly in (12), 3 formulas with saturating lid (13).

7, ball telescopic shaft according to claim 1 is characterized in that a stroke is pearl stroke 1-1.5 times, is that a stroke equals the pearl stroke, and perhaps an axle stroke ratio pearl stroke increases pettiness, but at most should not be above 0.5 times.

8, ball telescopic shaft according to claim 1 is characterized in that the hollow cavity length of cylindrical shell (1,10) is more than 50% of pearl stroke.

Images