TWM636642U - Ball screw nut set and end assembly thereof - Google Patents

Abstract

A ball nut set includes a nut body and end components. The nut body includes an outer ring wall, an inner ring wall, a ball groove, a return channel, an assembly groove and a fixing hole. The assembly groove is arranged at the end, and the assembly groove has a first side, a second side, a bottom surface and an assembly groove wall. The wall of the assembling groove is adjacent to the first side, the second side and the bottom surface, and the surface of the assembling groove wall is flush with the surface of the outer ring wall. The end assembly accommodates an assembly slot. The end assembly includes a first contact surface, a second contact surface, a radial surface, a fixing portion and a return bend. The fixing part is arranged on the radial surface. The first contact surface is pressed on the first side surface, the second contact surface is pressed on the second side surface, and the two ends of the return curve correspond to the ball groove and the return channel respectively.

Description

Ball nut sets and their end assemblies

A ball nut set and an end assembly applied to the aforementioned ball nut set.

Generally speaking, in order to assemble the ball circulator, grooves are cut in the nut, for example. However, this method will result in no wall thickness at the groove of the nut, resulting in lower structural rigidity and higher noise. At the same time, the flange surface of the nut cannot be designed to be flush with the plane of the nut during design, and the ball circulator is also easily damaged when it is impacted. In addition, if the length of the guide portion of the ball circulator is long, it is easy to cause the problem of ball squeezing, which further deteriorates the smoothness.

In view of this, a ball nut assembly is provided according to an embodiment, including a nut body and an end assembly. The nut body includes an outer ring wall, an inner ring wall, a ball groove, a return channel, an assembly groove and a fixing hole. The ball groove ring is arranged on the inner ring wall. The return channel is axially penetrated between the outer ring wall and the inner ring wall. The assembly groove is arranged at the end, and the assembly groove has a first side, a second side, a bottom surface and an assembly groove wall. The first side and the second side are oppositely arranged, and the bottom surface is connected with the first side and the second side. The fixing hole is arranged on the bottom surface, the assembly groove wall is adjacent to the first side surface, the second side surface and the bottom surface, and the surface of the assembly groove wall is flush with the surface of the outer ring wall. The end component is accommodated in the assembly groove of the nut body. The end assembly includes a first contact surface, a second contact surface, a radial surface, a fixing portion and a return bend. The first contact surface and the second contact surface are oppositely arranged. The radial surface extends radially and connects the first contact surface and the second contact surface, and the fixing part is arranged on the radial surface. The return bend is set on the second contact surface, the first contact surface is press-fit to the first side of the assembly groove, the second contact surface is correspondingly press-fit to the second side of the assembly groove, and the two ends of the return bend are respectively corresponding to the ball grooves And the return channel, the fixing part is set and fixed in the fixing hole.

In some embodiments, the nut body further includes a flange portion extending radially from one end of the nut body.

In some embodiments, the ball nut assembly further includes a dust-proof sheet, the dust-proof sheet has a convex portion, the nut body has a hollow portion, the dust-proof sheet is assembled in the hollow portion, and the convex portion covers the assembly groove correspondingly.

In some embodiments, the wall thickness of the assembly channel is at least 2 mm.

In some embodiments, a shaft is further included, and the shaft is passed through the nut body.

In some embodiments, a plurality of balls are further included, and the plurality of balls roll in the ball circulation channel formed by the ball groove, the outer wall of the shaft, the return bend and the return channel.

In some embodiments, the return bend has a first end and a second end, and the rolling distance from the first end to the second end is 2 to 3 times the diameter of the ball.

In some embodiments, the end assembly further includes an axial surface, the axial surface extends axially and connects the first contact surface and the second contact surface, the first contact surface has a first fillet, the second contact surface and the second contact surface There is a second fillet between the axial faces.

In some embodiments, the radius of the first fillet is 0.8 to 1.8 times the diameter of the ball.

In some embodiments, the nut body has an axis, a line connecting the second rounded portion and the axis forms a reference axis, and the angle formed by the second contact surface extending to intersect the reference axis is 40 to 50 degrees.

In addition, an end assembly is provided, which is suitable for being assembled on a nut to allow a plurality of balls to roll. The end assembly includes a first contact surface, a second contact surface, a radial surface, a fixing portion, and a return bend. The first contact surface and the second contact surface are oppositely arranged. The radial face extends radially toward the nut and connects the first contact surface and the second contact surface. The fixing part is arranged on the radial surface. The return bend is arranged on the second contact surface.

In some embodiments, the end component further includes an arc surface, the arc surface is located on the opposite side of the axial surface and connects the first contact surface and the second contact surface, and the line connecting the second fillet and the center of the arc surface forms a reference axis , the angle formed by the second contact surface extending to intersect with the reference axis is 40 to 50 degrees.

To sum up, according to one embodiment, a ball nut assembly and an end assembly thereof are provided. The assembly groove wall is set in the assembly groove. By increasing the thickness of the nut body, the strength and service life of the nut body are improved, and the noise impact of the ball nut assembly is also reduced. Further, the flange part extends radially from the end of the nut body, so that the surface of the flange part is aligned with the end surface of the nut body, so that the maximum assembly plane can be maintained during assembly. In addition, by shortening the lead length of the end assembly, the problem of bead extrusion can be avoided.

See Figures 1 through 5. FIG. 1 is a schematic perspective view of a ball nut assembly according to an embodiment. FIG. 2 is a schematic perspective view of another angle of the ball nut assembly according to an embodiment. FIG. 3 is an exploded schematic diagram of a ball nut assembly according to an embodiment. Fig. 4 is a schematic perspective view of a tip assembly according to an embodiment. FIG. 5 is a schematic partial cross-sectional view of a ball nut assembly according to an embodiment. Compared with Fig. 3, the dust-proof sheet 19 on one side is omitted in Fig. 1 for convenience of description.

The ball nut set 100 is suitable for rolling a plurality of balls 40 in the ball nut set 100 . The ball nut assembly 100 includes a nut body 10 (nut) and two end components 20 . In this embodiment, the ball nut assembly 100 may further include a shaft 30 passing through the nut body 10 . As shown in FIG. 3 , two end components 20 are respectively assembled on two ends of the nut body 10 . In this embodiment, two end assemblies 20 are taken as an example for illustration, but in other implementations, only one end assembly 20 may also be provided. In addition, since the two end assemblies 20 are assembled symmetrically with the same structure, only the end assembly 20 on one side will be described below, and the end assembly 20 on the other side will not be repeated.

The nut body 10 includes an outer ring wall 11 , an inner ring wall 12 , a ball groove 13 , a return channel 14 , a second assembly groove 15 , a fixing hole 16 , and a first end portion 17 and a second end portion 18 corresponding in the axial direction. The ball groove 13 is arranged around the inner ring wall 12 , and the return channel 14 is axially arranged between the outer ring wall 11 and the inner ring wall 12 . The two assembly slots 15 are respectively disposed on the first end 17 and the second end 18 of the nut body 10 . In this embodiment, since an assembly groove 15 is respectively provided on the first end portion 17 and the second end portion 18 of the nut body 10, two end assemblies 20 are also used to be assembled in each assembly. in slot 15. In other embodiments, only one assembling groove 15 may be formed on the first end 17 or the second end 18 of the nut body 10 , and only one end assembly 20 may be used for the corresponding number of assembling grooves 15 . In addition, the first end portion 17 and the second end portion 18 may have different implementation styles, and the different structures of the first end portion 17 and the second end portion 18 will be described in detail later.

It can be seen from FIG. 1 and FIG. 3 that the assembly groove 15 has a first side 151 , a second side 152 , a bottom 153 and an assembly groove wall 154 . The first side 151 and the second side 152 are oppositely disposed, and the bottom surface 153 connects the first side 151 and the second side 152 . The fixing hole 16 is disposed on the bottom surface 153 . The assembly groove wall 154 is adjacent to the first side surface 151 , the second side surface 152 and the bottom surface 153 , and the surface of the assembly groove wall 154 is parallel to the surface of the outer ring wall 11 . It can be seen from FIG. 1 and FIG. 3 that the first side 151 is partially opened from one side of the inner ring wall 12 , and the second side 152 is also partially opened from one side of the inner ring wall 12 . The bottom surface 153 is defined on one side of the inner ring wall 12 along the radial direction. In this way, the assembly groove 15 is prevented from being directly exposed to the nut body 10 . In this embodiment, the thickness between the assembly groove wall 154 and the outer ring wall 11 is at least 2 mm.

Please refer to FIGS. 1 to 4 at the same time. The two end assemblies 20 are applied in the ball nut assembly 100 , and the two end assemblies 20 are assembled in the two assembly grooves 15 of the nut body 10 respectively. As shown in FIGS. 3 and 4 , each end assembly 20 includes a first contact surface 21 , a second contact surface 22 , a radial surface 23 , a fixing portion 24 and a return bend 25 . The first contact surface 21 and the second contact surface 22 are oppositely disposed on two sides. The radial surface 23 extends toward the radial direction of the nut body 10 and connects the first contact surface 21 and the second contact surface 22 . The fixing portion 24 is disposed on the radial surface 23 . The return bend 25 is disposed on the second contact surface 22 .

When the end assembly 20 is assembled in the assembly groove 15 as shown in Figure 1, please refer to Figure 1, Figure 3 and Figure 4 at the same time, the fixing part 24 is correspondingly assembled to the fixing hole 16, and the first contact surface 21 will press the Fitted on the first side 151 of the assembly groove 15 , the second contact surface 22 is correspondingly pressed on the second side 152 of the assembly groove 15 . As shown in Figure 5, the two ends of the backflow bend 25 correspond to the ball groove 13 and the backflow channel 14 respectively. In this embodiment, the fixing hole 16 is a screw hole, and the fixing part 24 includes, for example, a screw and a through hole. In this way, the end assembly 20 is assembled in the assembly groove 15 .

Please refer to FIG. 1 , FIG. 3 and FIG. 5 at the same time, the shaft 30 axially passes through the nut body 10 . As shown in FIG. 5 , the ball 40 rolls in the ball circulation channel formed by the ball groove 13 , the outer wall of the shaft 30 , the return curve 25 and the return channel 14 . In this embodiment, the shaft 30 further includes a plurality of track grooves 32 , and the balls 40 roll in the channel formed by the ball grooves 13 and the track grooves 32 . In other embodiments, the shaft 30 can be a round rod with a smooth surface, and does not necessarily need to have a track groove 32 , and the ball 40 is a channel formed between the ball groove 13 and the smooth surface of the shaft 30 .

Specifically, by setting the assembly groove wall 154 in the assembly groove 15, the integrity, strength and service life of the nut body 10 can be further improved because the assembly groove wall 154 has a certain thickness instead of being hollowed out and exposed. The impact of noise that may be generated by the ball nut assembly 100 due to the absence of the assembly groove wall 154 to expose internal components is reduced.

In this embodiment, the first end portion 17 and the second end portion 18 have different implementation styles. As shown in FIG. 2 , the nut body 10 further includes a flange portion 181. The second end portion 18 is formed extending radially. That is to say, the surface of the flange portion 181 is flush with the surface of the second end portion 18 of the nut body 10 . In this way, the maximum assembly plane can be maintained during assembly. In this embodiment, the flange portion 181 is formed from the second end portion 18 , but is not limited thereto, and may also be formed on the first end portion 17 .

In this embodiment, the ball nut assembly 100 further includes two dust-proof sheets 19, each dust-proof sheet 19 has a convex portion 191, the nut body 10 has hollow portions 10A, 10B, and the two dust-proof sheets 19 are assembled in the hollow portions 10A, 10B, respectively. 10B, and the protrusion 191 covers the assembly groove 15 correspondingly. Referring to Fig. 2 and Fig. 3 again, the two dust-proof sheets 19 are respectively arranged on the first end 17 and the second end 18 of the nut body 10, through the hollow part 10A arranged on the nut body 10, to prevent dust or dirt from entering At the same time, the ball nut assembly 100 covers the assembly groove 15 correspondingly through the protrusion 191 protruding from the periphery of the dustproof sheet 19 , so as to achieve a dustproof effect on the assembly groove 15 . In this embodiment, the two dust-proof sheets 19 are respectively disposed on the first end 17 and the second end 18 , but it is not limited thereto, and the dust-proof sheet 19 can also be added only on the side where the end assembly 20 is disposed.

See Figure 6. Figure 6 is a front view of a tip assembly according to one embodiment. As shown in FIG. 6 , in this embodiment, the return bend 25 has a first end 251 and a second end 252 , and the first end 251 and the second end 252 are two opposite ends. The distance from the first end 251 to the second end 252 is the distance that the ball 40 can roll in the return curve 25. By shortening the distance from the first end 251 to the second end 252, the problem of ball extrusion by the ball 40 can be reduced. Increase the rolling smoothness of the ball 40 . In this embodiment, the rolling distance from the first end 251 to the second end 252 is 2 to 3 times the diameter of the ball 40 .

Please refer to Figure 3, Figure 4, Figure 6 and Figure 7. 7 is a schematic diagram of a nut body, end assembly and shaft according to one embodiment. FIG. 7 omits some elements to clarify the drawing, and only shows the nut body 10 , the end assembly 20 and the shaft 30 . As shown in FIGS. 3 and 4 , the end assembly 20 further includes an axial surface 26 extending toward the axial direction of the nut body 10 and connecting the first contact surface 21 and the second contact surface 22 . The first contact surface 21 has a first rounded portion 211 , and a second rounded portion 27 is formed between the second contact surface 22 and the axial surface 26 . By providing the first rounded portion 211 , the impact force of the first contact surface 21 of the end assembly 20 against the first side surface 151 is reduced, and wear of the end assembly 20 and the nut body 10 is reduced. In this embodiment, the radius of the first rounded portion 211 is 0.8 to 1.8 times the diameter of the ball 40 . As shown in FIG. 6 and FIG. 7 , the return bend 25 of the end assembly 20 is set on the second contact surface 22 , and has a guide angle for guiding the rolling of the ball 40 due to the inclination of the second contact surface 22 . It can be seen from Figure 7 that the line connecting the second rounded corner portion 27 and the axis C of the nut body 10 forms the reference axis A, and the second contact surface 22 extends to the angle θ formed by the intersection with the reference axis A, which is the guide The angle, the included angle θ may be 40 to 50 degrees, and here, the included angle θ is, for example, 43 degrees. In addition, the end assembly 20 further includes an arc surface 28 located on the opposite side of the axial surface 26 and connected to the first contact surface 21 and the second contact surface 22 . Since the center of the arc surface 28 corresponds to the axis C of the nut body 10, the line connecting the second rounded corner portion 27 and the center of the arc surface 28 (that is, the axis C) also forms the reference axis A, and the second contact surface 22 extends to intersect with the reference axis A to form an included angle θ which is also the guiding angle.

100: Ball nut set 10: nut body 10A, 10B: hollow part 11: Outer ring wall 12: Inner ring wall 13: Ball groove 14: return channel 15: Assembly slot 151: first side 152: second side 153: Bottom 154: Assembling the tank wall 16: Fixing hole 17: first end 18: second end 181: flange part 19: Dust-proof sheet 191: convex part 20: End assembly 21: The first contact surface 211: The first fillet 22: Second contact surface 23: radial plane 24: fixed part 25: Return bend 251: first end 252: second end 26: axial plane 27: Second fillet 28: arc surface 30: shaft 32: track groove 40: Ball A: Reference axis C: axis θ: included angle

FIG. 1 is a schematic perspective view of a ball nut assembly according to an embodiment. FIG. 2 is a schematic perspective view of another angle of the ball nut assembly according to an embodiment. FIG. 3 is an exploded schematic diagram of a ball nut assembly according to an embodiment. Fig. 4 is a schematic perspective view of a tip assembly according to an embodiment. FIG. 5 is a schematic partial cross-sectional view of a ball nut assembly according to an embodiment. Figure 6 is a front view of a tip assembly according to one embodiment. 7 is a schematic diagram of a nut body, end assembly and shaft according to one embodiment.

100: Ball nut set

10: nut body

10B: Hollow part

15: Assembly slot

17: first end

18: second end

181: flange part

20: End assembly

30: shaft

Claims (15)

A ball nut assembly, comprising: A nut body, including an outer ring wall, an inner ring wall, a ball groove, a return channel, an assembly groove and a fixing hole, the ball groove ring is set on the inner ring wall, and the return channel is axially penetrated Between the outer ring wall and the inner ring wall, the assembly groove is arranged at one end, the assembly groove has a first side, a second side, a bottom and a wall of the assembly groove, the first side and the second The two sides are opposite to each other, the bottom connects the first side and the second side, the fixing hole is set on the bottom, the wall of the assembling groove is adjacent to the first side, the second side and the bottom, and the wall of the assembling groove the surface is parallel to the surface of the outer ring wall; and An end assembly, accommodated in the assembly groove of the nut body, the end assembly includes a first contact surface, a second contact surface, a radial surface, a fixing portion and a return bend, the first The contact surface and the second contact surface are oppositely arranged, the radial surface extends radially and connects the first contact surface and the second contact surface, the fixing part is arranged on the radial surface, and the return bend is arranged on the The second contact surface, the first contact surface is press-fitted on the first side of the assembly groove, the second contact surface is correspondingly pressed on the second side of the assembly groove, and the two ends of the return bend are opposite to each other. According to the ball groove and the return channel, the fixing part is assembled and fixed in the fixing hole. The ball nut assembly according to claim 1, wherein the nut body further includes a flange portion, and the flange portion is formed by extending radially from one end of the nut body. The ball nut set as described in Claim 1 further includes a dustproof sheet, the dustproof sheet has a convex part, the nut body has a hollow part, the dustproof sheet is set in the hollow part, and the convex part corresponds to Cover the assembly slot. The ball nut assembly according to claim 1, wherein the thickness between the assembly groove wall and the outer ring wall is at least 2mm. The ball nut assembly as described in claim 1 further includes a shaft that passes through the nut body. The ball nut assembly as described in Claim 5 further includes a plurality of balls rolling in a ball circulation channel formed by the ball groove, the outer wall of the shaft, the return bend and the return channel. The ball nut assembly according to claim 6, wherein the return bend has a first end and a second end, and the rolling distance from the first end to the second end is 2 to 3 times the diameter of the ball . The ball nut assembly according to claim 6, wherein the end assembly further includes an axial surface extending axially and connecting the first contact surface and the second contact surface, the first The contact surface has a first rounded portion, and a second rounded portion is formed between the second contact surface and the axial surface. The ball nut assembly according to claim 8, wherein the radius of the first fillet is 0.8 to 1.8 times the diameter of the ball. The ball nut assembly according to claim 8, wherein the nut body has an axis, a line connecting the second fillet and the axis forms a reference axis, and the second contact surface extends to the The angle formed by the intersection of the reference axes is 40 to 50 degrees. An end assembly suitable for assembly with a nut for rolling a plurality of balls, comprising: a first contact surface; a second contact surface, the first contact surface and the second contact surface are oppositely arranged; a radial surface extending toward the radial direction of the nut and connecting the first contact surface and the second contact surface; a fixing portion provided on the radial surface; and A return bend is arranged on the second contact surface. In the end assembly as claimed in claim 11, the return bend has a first end and a second end, and the rolling distance from the first end to the second end is 2 to 3 times the diameter of the ball. The end assembly according to claim 11, wherein the end assembly further includes an axial surface extending in the axial direction and connecting the first contact surface and the second contact surface, the first contact The surface has a first rounded corner, and there is a second rounded corner between the second contact surface and the axial surface. The end assembly according to claim 13, wherein the first fillet is 0.8 to 1.8 times the diameter of the ball. The end assembly as claimed in claim 13, wherein the end assembly further includes an arc surface located on the opposite side of the axial surface and connecting the first contact surface and the second contact surface, the first contact surface The line connecting the two rounded corners with the center of the arc surface forms a reference axis, and the angle formed by the second contact surface extending to intersect with the reference axis is 40 to 50 degrees.

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