CN211009576U - Ball Spline - Google Patents

Abstract

A ball spline comprises a spline shaft and a nut, wherein the nut protrudes from a first boss on the inner ring surface of the spline shaft. The retainer is sleeved on the spline shaft and provided with second bosses, and the second bosses and the first bosses are arranged in a staggered mode and protrude out of the first bosses. And rolling members circulating between the nut, the spline shaft and the retainer. And the dustproof sheet is sleeved on the spline shaft and positioned at two sides of the retainer. The dustproof sheet protrudes out of the positioning parts, and the positioning parts are respectively arranged between the second bosses. Therefore, the positioning parts are respectively arranged between the second bosses, so that the rotation of the dustproof sheet relative to the spline shaft can be limited, the deviation of the dustproof sheet is reduced, and the assembly efficiency of the dustproof sheet is improved.

Description

Ball Spline

technical field

The utility model relates to a linear transmission device, in particular to a ball spline.

Background technique

A general ball spline, such as Taiwan Patent No. M558856, includes a spline shaft, a nut, a retainer, a plurality of balls, two dust-proof elements and two limit rings. The nut is sleeved on the spline shaft, and the retainer is arranged between the spline shaft and the nut to cooperate with the ball groove of the nut to circulate the balls inside. In the nut, the two sides of the retainer are respectively covered with dust-proof elements, and the dust-proof elements are limited in the nut by a limit ring.

However, the dustproof elements in the aforementioned designs still have room for improvement. First, the dust-proof convex part of the dust-proof sheet extends into the ball groove of the spline shaft. If the dust-proof convex part is deviated during the installation of the dust-proof element, the dust-proof convex part will be in contact with the spline shaft in the ball groove. It rubs and exerts force on the spline shaft, which produces abnormal resistance to the spline shaft, and has the disadvantage of being difficult to install. In addition, the dust-proof protrusion of the dust-proof element protrudes from the contact surface in the axial direction. As a result, a limit ring without buckle ears can be used to avoid the periphery of the dust-proof protrusion and insert the nut. However, such a The retaining ring is quite inconvenient to assemble or disassemble, which reduces the assembly efficiency of the dustproof element.

Utility model content

The main purpose of the present invention is to provide a ball spline, which can improve the assembly efficiency of the dust-proof element and prevent the dust-proof convex portion from being displaced after the dust-proof element is assembled.

A ball spline provided according to the present utility model comprises: a spline shaft; a nut sleeved on the spline shaft, the nut has an inner annular surface, and the nut protrudes from the inner annular surface a plurality of first bosses; a retainer sleeved on the spline shaft and located between the spline shaft and the nut, the retainer has a plurality of second bosses, each of the second bosses and each The first bosses are staggered and protrude from each of the first bosses; a plurality of rolling elements circulate among the nut, the spline shaft and the retainer; a plurality of dustproof sheets, each of the dustproof sheets The utility model is sleeved on the spline shaft and located on both sides of the retainer; it is characterized in that: the dustproof sheet protrudes a plurality of positioning parts, and each positioning part is respectively arranged between each of the second bosses.

Thereby, the positioning portions are respectively arranged between the second bosses to limit the rotation of the dust-proof sheet relative to the spline shaft to reduce the deviation of the lips of the dust-proof sheet, and the dust-proof sheet can be lifted through the positioning portions assembly efficiency.

It is worth mentioning that, each of the positioning portions can also be pressed against each of the second bosses, respectively. Thereby, the positioning stability of the dustproof sheet is enhanced.

In addition, if the dust-proof sheet has an outer ring body and an inner ring body, the outer ring body is arranged on the ball cage, the inner ring body is stacked on the outer ring body, and the positioning portions are formed on the outer ring body. a ring body, each of the lips is formed on the inner ring body. The inner ring body forms a first concave portion, a second concave portion and a third concave portion connected inwardly on opposite sides of the lip portions. The shortest distance between the first recess and the axis is a first distance; the shortest distance between the second recess and the axis is a second distance; the shortest distance between the third recess and the axis is a third distance ; The ball spline also includes a plurality of C-shaped retaining rings, each of which forms a ring groove at both ends of the nut, and each of the C-shaped retaining rings is clamped in each of the ring grooves of the nut, and each of the C-shaped buckles The minimum diameter of the inner circumference when the ring is inserted into each of the ring grooves of the nut is an inner diameter of a retaining ring; the second distance is less than half of the inner diameter of the retaining ring; the first distance and the third distance are less than half of the inner diameter of the retaining ring and greater than the second distance. When assembling the C-shaped retaining ring, through the arrangement of the first recess, the second recess and the third recess, the ears of the C-shaped retaining ring are avoided, thereby preventing the C-shaped retaining ring from interfering with the dustproof sheet. The C-shaped buckle with buckle ears is adopted, and the buckle pliers can be used during assembly to improve the assembly efficiency.

It is worth mentioning that the bottom of the first concave portion, the second concave portion or the third concave portion is flat, so that the processing is more efficient.

It should also be noted that, along the inner ring body, the lips are adjacent to each other by a long distance and a short distance, and the second recess is located between the short distances, or the second recess is located at the long distances. between. All of the above designs can avoid the buckle ears of the C-shaped buckle, thereby avoiding the effect of the C-shaped buckle interfering with the dustproof sheet.

Preferably, the spline shaft has a plurality of first rolling grooves extending along an axis, each of the first bosses has a plurality of second rolling grooves, and the retainer has a plurality of second rolling grooves between each of the second bosses. a plurality of third rolling grooves, each of the third rolling grooves penetrates the retainer, and each of the third rolling grooves forms a load path with the first rolling groove and the second rolling groove respectively, the retainer is in each of the The second boss has a plurality of return grooves, and each of the return grooves is connected to each of the third rolling grooves. The load path and the return grooves form a circulation path for each of the rolling elements to circulate, and each of the dustproof sheets protrudes more. and each of the lips respectively extends into each of the first rolling grooves.

Description of drawings

1 is a perspective view of a preferred embodiment of the present utility model;

2 is an exploded perspective view of a preferred embodiment of the present utility model;

Figure 3 is a partial perspective view of the preferred embodiment of the present invention, showing the situation without the spline shaft;

Figure 4 is a partial side view of the preferred embodiment of the present invention, showing the nut and retainer;

5 is a cross-sectional view of a preferred embodiment of the present invention, showing the inner structure of the nut;

6 is a partial side view of the preferred embodiment of the present invention, showing the matching of the dust-proof sheet and the C-shaped buckle;

FIG. 7 is a partial perspective view of the preferred embodiment of the present invention, showing that the second concave portion is located between the long intervals;

FIG. 8 is a partial perspective view of the preferred embodiment of the present invention, showing that the second concave portion is located between the short distances.

[Description of reference numerals]

10 Ball Splines

11 Spline shaft 111 First rolling groove

12 Nut 121 Inner ring

122 The first boss 123 The second rolling groove

124 Ring groove 13 Retainer

131 Second boss 132 Third rolling groove

133 Reflow tank 134 Guide

15 Dust-proof sheet 15a Outer ring body

15b Inner ring 151 Lip

152 Positioning part 153 First recessed part

154 Second recess 155 Third recess

16C Buckle 161 Buckle

A Axis L Long Pitch

S Short Pitch P Load Path

D1 first distance D2 second distance

D3 Third distance D4 Ring inner diameter

Detailed ways

In order to illustrate the technical features of the present utility model in detail, the following preferred embodiments are now listed and described in conjunction with the accompanying drawings as follows, wherein:

As shown in Figures 1-8, a ball spline 10 provided by a preferred embodiment of the present utility model includes a spline shaft 11, a nut 12, a retainer 13, and a plurality of rolling elements (in the figure (not shown), a plurality of dustproof sheets 15, and a plurality of C-shaped retaining rings 16.

The spline shaft 11 has a plurality of first rolling grooves 111 extending along an axis A.

The nut 12 is sleeved on the spline shaft 11 , the nut 12 has an inner annular surface 121 , and a plurality of first bosses 122 protrude from the inner annular surface 121 of the nut 12 . The nut 122 has a plurality of second rolling grooves 123 , and a ring groove 124 is formed at both ends of the nut 12 .

See Figures 2, 3 and 4. The retainer 13 is sleeved on the spline shaft 11 and located between the spline shaft 11 and the nut 12 , the retainer 13 has a plurality of second bosses 131 , and each of the second bosses 131 is connected to each of the second bosses 131 . The first bosses 122 are staggered and protrude from the first bosses 122 . The retainer 13 has a plurality of third rolling grooves 132 between each of the second bosses 131 , each of the third rolling grooves 132 penetrates the retainer 13 , and each of the third rolling grooves 132 is connected to the first The rolling groove 111 and the second rolling groove 123 form a load path P. The retainer 13 has a plurality of recirculation grooves 133 on each of the second bosses 131 , and each of the recirculation grooves 133 communicates with each of the third rolling grooves 132 respectively. The retainer 13 protrudes inwardly with a guide portion 134 at the junction of each of the return grooves 133 and each of the third rolling grooves 132 , and each of the guide portions 134 respectively extends into the first rolling groove 111 of the spline shaft 11 , Used to guide the running direction of the rolling element.

Each of the rolling elements (not shown in the figure) is disposed in the third rolling groove 132 and the return groove 133 , and the load path and the return grooves 133 form a circulation path for the rolling elements to circulate.

Please refer to FIG. 1 , each of the dustproof sheets 15 is sleeved on the spline shaft 11 and located on both sides of the retainer 13 , each of the dustproof sheets 15 protrudes from a plurality of lips 151 , and each of the lips 151 respectively protrudes into Each of the first rolling grooves 111 is used to prevent dust or foreign matter from entering the nut 12 and the retainer 13 .

The two ends of each C-shaped retaining ring 16 are respectively provided with a retaining ear 161 , which are respectively clamped in each of the grooves 124 of the nut 12 to prevent the retainer 13 and each of the dustproof sheets 15 from coming out of the nut 12 .

The feature of this embodiment is that the dustproof sheet 15 protrudes from a plurality of positioning portions 152 , and the positioning portions 152 are respectively disposed between the second bosses 131 .

Since the positioning portions 152 are respectively disposed between the second bosses 131, the rotation of the dustproof sheet 15 relative to the spline shaft 11 can be restricted to reduce the deviation of the lips 151 of the dustproof sheet 15, thereby preventing the lip portions The 151 exerts force on the spline shaft 11 in the first rolling groove 111 , which generates thrust on the spline shaft 11 to hinder the operation, and the assembling efficiency of the dustproof sheet can be improved through the positioning portions.

In addition, each of the positioning portions 152 can be pressed against each of the second bosses 131 respectively, and the positioning stability of the dustproof sheet 15 can be enhanced by applying force to each of the second bosses 131 respectively.

It should also be noted that, in this embodiment, the dustproof sheet 15 has an outer ring body 15a and an inner ring body 15b, the outer ring body 15a is arranged on the holder 13, and the inner ring body 15b is stacked on the holder 13. The outer ring body 15a, the positioning portions 152 are formed on the outer ring body 15a, and the lip portions 151 are formed on the inner ring body 15b.

See Figure 6-8. The inner ring body 15b has a first recess 153 , a second recess 154 and a third recess 155 on opposite sides of the lips 151 . The shortest distance between the first recess 153 and the axis A is a first distance D1. The shortest distance between the second recess 154 and the axis A is a second distance D2. The shortest distance between the third recess 155 and the axis A is a third distance D3. It should be noted that when the C-shaped retaining ring 16 is inserted into the nut 12, the minimum diameter of the inner circumference is a retaining ring inner diameter D4. The second distance D2 is less than half of the inner diameter D4 of the retaining ring. The first distance D1 and the third distance D3 are less than half of the inner diameter D4 of the retaining ring and greater than the second distance D2. It should be noted that, in this embodiment, the bottoms of the first concave portion 153 , the second concave portion 154 or the third concave portion 155 are flat, so that the processing is more efficient.

When assembling the C-shaped retaining ring 16, the first concave portion 153, the second concave portion 154 and the third concave portion 155 are arranged to avoid the buckle ears 161 of the C-shaped retaining ring 16, thereby avoiding the assembled C-shaped retaining ring. 16 interferes with the dust-proof sheet 15, so compared with the prior art, the user can operate the clasp pliers to assemble the C-shaped clasp, which improves the assembly efficiency.

See also Figures 7 and 8. Along the inner ring body 15b, the lips 151 are adjacent to each other by a long distance L and a short distance S, the second concave part 154 is located between the short distance S, or the second concave part 154 is located between the long distance S between the distances L. All of the above designs can avoid the buckle ears 161 of the C-shaped retaining ring 16 , thereby reducing the effect of the C-shaped retaining ring 16 interfering with the dustproof sheet 15 after assembly.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included within the protection scope of the present utility model.

Claims (7)

1. A ball spline comprises a spline shaft; the nut is sleeved on the spline shaft and provided with an inner ring surface, and a plurality of first bosses protrude from the inner ring surface; the retainer is sleeved on the spline shaft and positioned between the spline shaft and the nut, the retainer is provided with a plurality of second bosses, and the second bosses and the first bosses are arranged in a staggered manner; a plurality of rolling members that circulate among the nut, the spline shaft, and the retainer; the dustproof sheets are sleeved on the spline shaft and positioned on two sides of the retainer; the method is characterized in that:

the dustproof sheet protrudes out of a plurality of positioning parts, and each positioning part is respectively arranged between the second bosses.

2. The ball spline of claim 1, wherein: each positioning part is respectively propped against each second boss.

3. The ball spline of claim 1, wherein: the dustproof sheet is provided with an outer ring body and an inner ring body, the outer ring body is arranged on the ball retainer, the inner ring body is overlapped on the outer ring body, each positioning part is formed on the outer ring body, and each lip part is formed on the inner ring body; the inner ring body is provided with a first concave part, a second concave part and a third concave part which are connected at the opposite sides of each lip part; the shortest distance between the first concave part and the axle center is a first distance; the shortest distance between the second concave part and the axis is a second distance; the shortest distance between the third concave part and the axle center is a third distance; the ball spline also comprises a plurality of C-shaped retaining rings, two ends of the screw cap respectively form a ring groove, each C-shaped retaining ring is clamped in each ring groove of the screw cap respectively, and the minimum diameter of the inner circumference when each C-shaped retaining ring is embedded into each ring groove of the screw cap is the inner diameter of the retaining ring; the second distance is less than half of the inner diameter of the retaining ring; the first distance and the third distance are less than half of the inner diameter of the retaining ring and greater than the second distance.

4. The ball spline of claim 3, wherein: the bottom of the first concave part, the second concave part or the third concave part is a plane.

5. The ball spline of claim 3, wherein: the lips are adjacent to each other along the inner ring at a long distance and a short distance, and the second recess is located between the short distances.

6. The ball spline of claim 3, wherein: the lips are adjacent to each other along the inner ring at a long distance and a short distance, and the second recess is located between the long distances.

7. The ball spline of claim 1, wherein: the spline shaft is provided with a plurality of first rolling grooves extending along a shaft center, each first boss is provided with a plurality of second rolling grooves, the retainer is provided with a plurality of third rolling grooves between the second bosses, each third rolling groove penetrates through the retainer, each third rolling groove and the first rolling groove and the second rolling groove form a load path, the retainer is provided with a plurality of backflow grooves at each second boss, each backflow groove is communicated with each third rolling groove, the load path and the backflow grooves form a circulating path for each rolling element to circularly flow, each dustproof sheet protrudes out of a plurality of lips, and each lip extends into each first rolling groove.

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