TWM591577U - Ball spline - Google Patents

Abstract

A ball spline includes a spline shaft and a nut projecting from the first boss on the inner ring surface. The retainer is sleeved on the spline shaft, the retainer has a second boss, each second boss is interleaved with each first boss and protrudes from each first boss. The rolling parts circulate between the nut, spline shaft and retainer. Dustproof sheet, sleeved with spline shaft and located on both sides of the retainer. The dustproof sheet protrudes from the positioning portion, and each positioning portion is provided between each second boss. In this way, the positioning portions are respectively disposed between the second bosses, which can restrict the rotation of the dustproof sheet relative to the spline shaft to reduce the deviation of the dustproof sheet, and improve the assembly efficiency of the dustproof sheet.

Description

Ball spline

This creation is related to the linear transmission device, especially a ball spline.

Press, the general ball spline, such as the Republic of China Patent No. M558856, contains a spline shaft, a nut, a retainer, a plurality of balls, two dustproof components 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 nut ball groove to allow the balls to circulate inside. In the nut, the dustproof elements are covered on both sides of the retainer, and the dustproof elements are restricted in the nut by the limit ring.

However, the dust-proof element in the aforementioned design still has room for improvement. First, the dust convex portion of the dust sheet extends into the ball groove of the spline shaft. However, if the dust convex portion is displaced during the installation of the dust element, the dust convex portion will rub against the spline shaft in the ball groove and apply The force on the spline shaft produces abnormal resistance to the spline shaft, which has the disadvantage that it is not easy to install. In addition, the dust-proof convex part of the dust-proof element protrudes axially beyond the fitting surface. In this way, a limit ring without a buckle must be used to escape from the periphery of the dust-proof convex part and be embedded in the nut. However, such a buckle Whether the ring is installed or disassembled is quite inconvenient, which reduces the assembly efficiency of the dustproof element.

The main purpose of this creation is to provide a ball spline, which can improve the assembly efficiency of the dustproof element and prevent the dustproof convex portion from being displaced after the dustproof element is assembled.

The reason is that a ball spline provided according to this creation includes: a spline shaft; a nut, sleeved on the spline shaft, the nut has an inner ring surface, the nut is on the inner ring surface Protruding a plurality of first bosses; a retainer sleeved between the spline shaft and between the spline shaft and the nut, the retainer has a plurality of second bosses, each of the second bosses Staggered with each of the first bosses and protruding from each of the first bosses; a plurality of rolling elements, circulating between the nut, the spline shaft, and the retainer; a plurality of dust sheets, each of the dust sheet sleeves It is provided 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 of the positioning parts is provided between each of the second bosses.

Thereby, each of the positioning portions provided between the second bosses can restrict the rotation of the dust sheet relative to the spline shaft to reduce the deflection of the dust sheet lip, and the assembly efficiency of the dust sheet can be improved through the positioning portions .

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

In addition, if the dust sheet is provided with an outer ring body and an inner ring body, the outer ring body is provided on the ball retainer, the inner ring body is stacked on the outer ring body, and each positioning portion is formed on the outer ring Each of the lips is formed in 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 each of the lips. 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, a ring groove is formed at each end of the nut, and each of the C-shaped retaining rings is respectively caught in each of the ring grooves of the nut, and each of the C-shaped retaining rings is embedded The minimum diameter of the inner circumference of each ring groove of the nut is an 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 the inner diameter of the retaining ring Half and greater than this second distance. When assembling the C-shaped buckle, the arrangement of the first recess, the second recess and the third recess avoids the buckle of the C-shaped buckle, thereby preventing the C-shaped buckle from interfering with the dustproof sheet, and this design can A C-shaped buckle with a buckle is used, and buckle pliers can be used during assembly to improve assembly efficiency.

It is worth mentioning that the bottom of the first recess, the second recess, or the third recess is flat, which makes the processing more efficient.

It should also be noted that, along the inner ring body, the lips are adjacent to each other by a long pitch and a short pitch, and the second recess is located between the short pitches, or the second recess is located at the long pitches between. The above design can achieve the effect of avoiding the buckle of the C-shaped buckle, thereby preventing the C-shaped buckle from 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 first grooves between the second bosses Three 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, and the retainer is provided on each of the second convex grooves The table has a plurality of return grooves, and each of the return grooves respectively communicates with each of the third rolling grooves. The load path and the return grooves form a circulation path for each rolling element to circulate and flow, and each of the dust-proof sheets protrudes a plurality of lips, each The lips extend into the first rolling grooves respectively.

In order to explain the technical characteristics of this creation in detail, the following preferred embodiments are described below in conjunction with the schematic description, in which:

As shown in FIGS. 1-8, a ball spline 10 provided by a preferred embodiment of the present invention includes a spline shaft 11, a nut 12, a retainer 13, and a plurality of rolling elements (not shown) 、Plurality of dustproof sheets 15、Plurality of C-shaped buckles 16.

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

The nut 12 is sleeved on the spline shaft 11, the nut has an inner ring surface 121, the nut 12 protrudes from the inner ring surface 121 a plurality of first bosses 122, each of the first bosses 122 A plurality of second rolling grooves 123 are formed, and a ring groove 124 is formed at each end of the nut 12.

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

Each rolling element (not shown) 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 each of the rolling elements to circulate.

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

Each C-shaped buckle 16 has a buckle 161 at both ends, which are respectively caught in the ring grooves 124 of the nut 12 to prevent the retainer 13 and the dustproof pieces 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 each of the positioning portions 152 is provided between the second bosses 131, respectively.

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 lip 151 of the dustproof sheet 15, thereby avoiding each of the lip 151 A force is applied to the spline shaft 11 in the first rolling groove 111 to generate a thrust to hinder the operation of the spline shaft 11, and the assembly efficiency of the dustproof sheet can be improved through each positioning portion. .

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

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 disposed on the holder 13, and the inner ring body 15b is stacked on the In the outer ring body 15a, each positioning portion 152 is formed in the outer ring body 15a, and each lip portion 151 is formed in the inner ring body 15b.

Refer to Figure 6-8. The inner ring body 15b has a first concave portion 153, a second concave portion 154, and a third concave portion 155 on opposite sides of each lip 151. The shortest distance between the first concave portion 153 and the axis A is a first distance D1. The shortest distance between the second concave portion 154 and the axis A is a second distance D2. The shortest distance between the third concave portion 155 and the axis A is a third distance D3. It should be noted that when the C-shaped buckle 16 is inserted into the nut 12, the minimum diameter of the inner circumference is a buckle 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 smaller than half of the inner diameter D4 of the retaining ring and larger than the second distance D2. It should also 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, which makes the processing more efficient.

When assembling the C-shaped buckle 16, the first recess 153, the second recess 154, and the third recess 155 are provided to avoid the buckle 161 of the C-shaped buckle 16, thereby avoiding the C-shaped buckle after assembly The ring 16 interferes with the dust-proof sheet 15, so compared with the prior art, the user can operate the buckle pliers to assemble the C-shaped buckle to improve the assembly efficiency.

Please also refer to Figures 7 and 8. Along the inner ring body 15b, the lips 151 are adjacent to each other by a long pitch L and a short pitch S, the second recess 154 is located between the short pitches S, or the second recess 154 is located at each long Between the spacing L. The above design can achieve the effect of avoiding the buckle 161 of the C-shaped buckle 16, thereby reducing the effect of the C-shaped buckle 16 interfering with the dustproof sheet 15 after assembly.

10: Ball spline 11: Spline shaft 111: first rolling groove 12: Nut 121: inner torus 122: First boss 123: Second rolling groove 124: Ring groove 13: retainer 131: Second boss 132: Third rolling groove 133: reflux tank 134: Guide 15: Dustproof sheet 15a: outer ring 15b: inner ring 151: Lips 152: Positioning Department 153: First recess 154: Second recess 155: third recess 16C: type buckle 161: Ear clip A: axis L: Long pitch S: short pitch P: load path D1: First distance D2: Second distance D3: third distance D4: inner diameter of buckle

Figure 1 is a perspective view of a preferred embodiment of the present creation. FIG. 2 is an exploded perspective view of the preferred embodiment of the present creation. FIG. 3 is a partial perspective view of a preferred embodiment of the present creation, showing the situation without a splined 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 the preferred embodiment of the present invention, showing the internal structure of the nut. FIG. 6 is a partial side view of the preferred embodiment of the present invention, showing the combination 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 each long pitch. 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 pitches.

10: Ball spline

11: Spline shaft

111: first rolling groove

12: Nut

121: inner torus

122: First boss

123: Second rolling groove

124: Ring groove

13: retainer

131: Second boss

132: Third rolling groove

133: reflux tank

134: Guide

15: Dustproof sheet

15a: outer ring

15b: inner ring

151: Lips

152: Positioning Department

16:C type buckle

161: Ear clip

A: axis

Claims (7)

A ball spline, including a spline shaft; a nut, sleeved on the spline shaft, the nut has an inner ring surface, the nut projects a plurality of first bosses on the inner ring surface; a holding Device, 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 of the first bosses are staggered; A plurality of rolling elements circulates between the nut, the spline shaft and the retainer; a plurality of dust sheets, each of the dust sheets is sleeved on the spline shaft and located on both sides of the retainer; : The dustproof sheet protrudes from a plurality of positioning parts, and each of the positioning parts is provided between the second bosses. According to the ball spline of item 1 of the patent application scope, each of the positioning portions abuts the second boss respectively. The ball spline according to item 1 of the patent application scope, wherein: the dustproof sheet has an outer ring body and an inner ring body, the outer ring body is provided on the ball retainer, and the inner ring body is stacked on the outer ring body , Each of the positioning portions is formed in the outer ring body, and each of the lips is formed in the inner ring body; the inner ring body has a first concave portion, a second concave portion and a The third recess; 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, a ring groove is formed at each end of the nut, and each of the C-shaped retaining rings is respectively caught in each of the ring grooves of the nut, each of the C The minimum diameter of the inner circumference when the type buckle is inserted into each ring groove of the nut is an inner diameter of the buckle; the second distance is less than half of the inner diameter of the buckle; the first distance and the third distance are less than the buckle The inner diameter of the ring is half and greater than the second distance. The ball spline according to item 3 of the patent application scope, wherein: the bottom of the first recess, the second recess, or the third recess is flat. According to the ball spline of item 3 of the patent application scope, the lip portions are adjacent to each other along the inner ring body by a long pitch and a short pitch, and the second recess is located between each of the short pitches. The ball spline according to item 3 of the patent application scope, wherein: along the inner ring body, the lips are adjacent to each other by a long pitch and a short pitch, and the second recess is located between each of the long pitches. The ball spline according to item 1 of the patent application scope, wherein: 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 is provided in each A plurality of third rolling grooves are formed between the second bosses, each third rolling groove penetrates the retainer, and each third rolling groove forms a load path with the first rolling groove and the second rolling groove, respectively The retainer has a plurality of return grooves on each of the second bosses, each of the return grooves communicates with each of the third rolling grooves, the load path and the return grooves form a circulation path for each rolling element to circulate, each The dustproof sheet protrudes a plurality of lips, and each of the lips extends into each of the first rolling grooves.

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