TWI580873B - Nut tube hole structure for ball screw - Google Patents

Description

Nut diameter of ball screw

The invention relates to the nut tube hole structure of the ball screw, in particular to a nut tube hole formed by three or more arcs.

Referring to Figures 1-4, the ball screw used in the prior art comprises a screw 1 having a spiral rolling groove 2 on the outer edge surface thereof and a nut 3 provided with the nut. a through hole 4 is formed in the inner edge surface of the through hole 4, and a rolling groove (not shown) opposite to the rolling groove 2 is formed. The rolling groove 2 and the rolling groove form a load path 5, and the nut 3 is formed on the nut 3 The outer surface is provided with a plurality of tube holes 6 communicating with the through holes 4, the tube holes 6 are engaged with the rolling grooves; at least one circulation fitting 7 comprising a cover member 8 and a base (not shown) The cover member 8 has two leg portions 9 and is respectively inserted into the tube hole 7, and the circulation fitting 7 is screwed to the outer surface of the nut 1 by a screw T.

However, as shown in FIG. 3, the hole diameter of the pipe hole 6 is designed as a long and narrow hole, and is formed by two arcs connected by two straight lines, and as shown in FIG. 4, the hole diameter of the pipe hole 6 uses two radii. Different arcs, and the center line L of the aperture is inclined with the axial direction of the screw 1, so that the load groove is likely to be insufficient in thickness, and the tube hole 6 interferes with the tube hole 6 after the processing is completed. The distance D of the tooth peak A is too dense [the tooth peak A refers to the portion adjacent to the rolling groove 2 or the rolling groove], and the thickness of the leg portion 9 of the cover member 8 must be smaller than the diameter of the tube hole 6. In order to allow the leg portion 9 to pass through the tube hole 6 of the nut 2, the strip causes the thickness of the leg portion 9 to be insufficiently thick, resulting in breakage, and the tube hole 6 and the tooth peak A meat. In the case where the thick distance D is too dense, in addition to causing damage to both sides of the rolling groove that is engaged with the pipe hole 6, the accuracy of the screw 2 to be helically displaced by the screw 1 is also affected.

Therefore, how to improve the conventional ball screw has the above-mentioned deficiency, which is the primary research and development subject of the present invention.

The invention provides a nut tube hole structure of a ball screw, the main purpose of which is to increase the thickness of the cover of the circulating fitting and the wall thickness of the nut tube hole, to avoid damage and affect the screw displacement of the screw in the screw. Accuracy.

In order to achieve the foregoing, the present invention provides a nut tube hole structure of a ball screw, comprising: a screw; a nut, the nut is provided with a through hole for the screw, and the outer surface of the nut has a a plane having at least one set of tube holes; a circulation fitting fixed to the plane of the nut; wherein each of the tube holes has at least three arcs, including: a first arc a second arc, a third arc, and the first arc, the second arc, and the third arc are respectively connected by a straight line, and the first arc, the second arc, and the third The arcs respectively have a first center, a second center and a third center, and the first center and the third center form a connecting line, and the connecting line is perpendicular to the axis of the screw.

Preferably, the direction of the second arc of the tube hole is set according to the effective thread direction of the rolling groove of the screw actually rotating.

Preferably, the radius of the first arc, the second arc, and the third arc is greater than the radius of the rolling member, and the distance between the first center and the second center is less than twice the diameter of the rolling member.

Preferably, the radius of the first arc, the second arc, and the third arc is greater than the radius of the rolling member, and the distance between the second center and the third center is less than twice the diameter of the rolling member.

Preferably, the radius of the first arc, the second arc, and the third arc is greater than the radius of the rolling member, and the distance between the first center and the third center is less than twice the diameter of the rolling member.

In order to enable the reviewing committee to have a better understanding and understanding of the purpose, features and functions of the present invention, please refer to the following for a detailed description of the following: Referring to Figures 5-8, the embodiment of the present invention is a nut tube hole structure of a ball screw, comprising: a screw 10, the surface of the screw 10 has a spiral rolling groove 11; a nut 20 is provided with a through hole 21 through which the screw 10 is bored. The inner surface of the through hole 21 is provided with a rolling groove 210 opposite to the rolling groove 11, and the rolling groove 11 and the rolling groove 210 are formed. a load path 30 for accommodating a plurality of rolling elements 31, and a portion located adjacent to the rolling groove 11 or the rolling groove 210 is defined as a tooth peak A1, and an outer peripheral surface of the nut 20 The plane 22 has at least one set of tube holes 220 and screw holes 221, and the tube holes 220 are in communication with the through holes 21 and engage with the rolling grooves 210; in the embodiment, each of the tube holes 220 The outer shape is composed of at least three arcs, and includes a first arc 2200, a second arc 2201, and a third arc 2202, and the first arc 2200, the second arc 2201, and the third arc 2202 The second arc 2201 of each group of tube holes 220 is disposed in a reverse direction; and the first arc 2200, the second arc 2201, and the third arc 2202 are respectively configured by connecting the straight lines T1, T2, and T3 respectively. Having a first center B1, a second center B2, and a third center B3, the first center B1 and the third center B3 are configured The connecting line Y is perpendicular to the axis X of the screw 10; a circulating fitting 40 is formed by a covering member 41 and a base (not shown), and the covering member 41 is The first leg portion 410 and the second leg portion 411 respectively have a first curved portion 4100 and a second curved portion 4110, and the first leg portion 410 and the second leg portion 411 respectively The first curved portion 4100 and the second curved portion 4110 of the first leg portion 411 and the second curved portion 411 are disposed correspondingly according to the direction of the second circular arc 2201 of the tubular hole 220, and then the screw fitting T is used to pass through the circulating fitting 40. Then, the screw hole 221 is locked, so that the circulation fitting 40 is fixed on the plane 22 of the nut 20 to form a turbulent passage and is connected to both ends of the load path 30.

Preferably, referring to FIG. 9-11, the direction of the second arc 2201 of the tube hole 220 can be set according to the effective thread direction of the rolling groove 11 when the screw 10 is actually screwed, as shown in FIG. The second arc 2201 of each group of tube holes 220 is disposed in the opposite direction; in FIG. 9, the second arc 2201 of each group of tube holes 220 is disposed in a corresponding direction; and in FIGS. 10 and 11, each The second arc 2201 of the group tube hole 220 is disposed in the same direction.

It is worth mentioning that the radius of the first arc 2200, the second arc 2201, and the third arc 2202 is greater than the radius of the rolling member 31; and the distance between the first center B1 and the second center B2. Or the distance between the second center B2 and the third center B3, or the distance between the first center B1 and the third center B3 is less than twice the diameter of the rolling member 31, so that the shape of the tube hole 220 is The size of the rolling element 31 can be smoothly moved to the other end of the choke channel after entering the choke channel without being affected by the shape of the tube hole 220 to the screw 20 of the screw 10 Do the accuracy of the spiral displacement.

Accordingly, in the present case, the tube hole 220 is modified from a conventional narrow hole to be formed by at least three first arcs 2200 having the same radius, a second arc 2201, and a third arc 2202, and the first arc 2200, the second arc 2201, and the third arc 2202 are respectively connected by a straight line T1, T2 and T3, so that the aperture of the tube hole 220 is increased, and the tube hole 220 and the tooth peak A1 are widened at the same time. The distance D1 between the thicknesses can be avoided. In addition to avoiding the distance D1 between the tube hole 220 and the tooth peak A1 being too thick, the tube hole 220 is easily damaged, and the nut 20 can be lifted on the screw 10 to make a spiral. The accuracy of the displacement.

In addition, the tube hole 220 of the present case is connected between the first circular arc 2200 and the third circular arc 2202 by a straight line T1 and T2 to connect the second circular arc 2201, whereby the cover member 41 can be added by the second circular arc 2201. The thickness of the first curved portion 4100 and the second curved portion 4110 prevents the first leg portion 410 and the second leg portion 411 from being damaged during installation due to insufficient thickness.

In the above, the above embodiments and drawings are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention. It should be within the scope of the patent of the present invention.

<知知>
1‧‧‧ screw
2‧‧‧ rolling groove
3‧‧‧ nuts
4‧‧‧through hole
5‧‧‧Load path
6‧‧‧ tube hole
7‧‧‧Circuit accessories
8‧‧‧Cover
9‧‧‧foot
T‧‧‧ screws
A‧‧‧牙峰
D‧‧‧Distance
L‧‧‧ center line <present invention>
10‧‧‧ screw
11‧‧‧ rolling groove
20‧‧‧ nuts
21‧‧‧Perforation
22‧‧‧ plane
220‧‧‧ tube hole
2200‧‧‧First arc
2201‧‧‧Second arc
2202‧‧‧The third arc
221‧‧‧ screw holes
210‧‧‧ rolling groove
30‧‧‧Load path
31‧‧‧ steel balls
40‧‧‧Circuit accessories
41‧‧‧ Covers
410‧‧‧First foot
4100‧‧‧First bend
411‧‧‧Second foot
4110‧‧‧second bend
T‧‧‧ screws
T1, T2, T3‧‧‧ straight line
A1‧‧‧ tooth peak
B1‧‧‧First Center
B2‧‧‧ second center
B3‧‧‧ Third Center
X‧‧‧ axis
Y‧‧‧With heart line
D1‧‧‧ distance

Figure 1 is a conventional partial exploded view.

Figure 2 is a conventional stereo combination diagram.

Figure 3 is a cross-sectional view of a conventional combination.

Figure 4 is a schematic plan view of the prior art.

Figure 5 is a partial exploded perspective view of the present invention.

Figure 6 is a schematic plan view of the present invention.

Figure 7 is a perspective assembled view of the present invention.

Figure 8 is a plan view of the tube hole of the present invention.

Figure 9 is a perspective cross-sectional view of the present invention.

Figure 10 is a plan view showing another embodiment of the tube hole of the present invention.

Figure 11 is a plan view showing still another embodiment of the tube hole of the present invention.

Figure 12 is a plan view showing another embodiment of the tube hole of the present invention.

220‧‧‧ tube hole

2200‧‧‧First arc

2201‧‧‧Second arc

2202‧‧‧The third arc

T1, T2, T3‧‧‧ straight line

B1‧‧‧First Center

B2‧‧‧ second center

B3‧‧‧ Third Center

X‧‧‧ axis

Y‧‧‧With heart line

Claims (9)

A nut tube hole structure of a ball screw, comprising: a screw having a spiral rolling groove on a surface thereof; a nut having a through hole for the screw to be inserted, the inner surface of the hole is provided with a relative a rolling groove of the rolling groove, the rolling groove and the rolling groove form a load path, the load path is a plurality of rolling elements, and the outer surface of the nut has at least one set of pipe holes, and the pipe hole is The perforation communicates with and engages with the rolling groove; a circulation fitting fixed to the outer peripheral surface of the nut to form a choke channel and connected to both ends of the load path; wherein each of the tube holes is configured The first arc, the second arc, and the third arc are formed by at least three or more arcs, and the first arc, the second arc, and the third arc are respectively connected by a straight line, and The first circular arc, the second circular arc, and the third circular arc respectively have a first center, a second center, and a third center, and the first center and the third center form a connecting line, and the connecting The core line is perpendicular to the axis of the screw. The nut tube hole structure of the ball screw according to claim 1, wherein the direction of the second arc of the tube hole is set according to the effective thread direction of the rolling groove of the screw. The nut tube hole structure of the ball screw according to claim 1, wherein a radius of the first arc, the second arc, and the third arc is greater than a radius of the rolling member, and the first center and the second The distance from the center of the circle is less than twice the diameter of the rolling element. The nut tube hole structure of the ball screw according to claim 1, wherein a radius of the first arc, the second arc, and the third arc is greater than a radius of the rolling member, and the second center and the third The distance from the center of the circle is less than twice the diameter of the rolling element. The nut tube hole structure of the ball screw according to claim 1, wherein a radius of the first arc, the second arc, and the third arc is greater than a radius of the rolling member, and the first center and the third The distance from the center of the circle is less than twice the diameter of the rolling element. The nut tube hole structure of the ball screw according to claim 1, wherein the second arc of each group of the tube holes is disposed in a reverse direction. The nut tube hole structure of the ball screw according to claim 1, wherein the second arc of each group of the tube holes is disposed in a corresponding direction. The nut tube hole structure of the ball screw according to claim 1, wherein the second arc of each group of the tube holes is disposed in the same direction. The nut tube hole structure of the ball screw according to claim 1, wherein the circulation fitting has a cover member, and the two ends of the cover member are respectively defined as a first leg portion and a second leg portion, the first Each of the leg portion and the second leg portion has a first curved portion and a second curved portion. The first curved portion and the second curved portion are disposed corresponding to the second arc direction of the tube hole.