TWM612399U - Ball screw device and nut end cap - Google Patents

Abstract

A nut end cover of a ball screw device includes an annular cover plate, a ball circulator and a screw scraper blade. The ring-shaped cover plate includes an inner ring surface and opposite inner and outer surfaces. The inner ring surface surrounds and forms an axial perforation, and the axial perforation penetrates the inner surface and the outer surface. The ball circulator extends axially from the inner surface of the annular cover plate. The screw wiper blade is located in the axial perforation and extends radially from the inner ring surface between the inner surface and the outer surface.

Description

Ball screw device and nut end cap

This creation is about a transmission device, especially a ball screw device and a nut end cap.

Ball screws are widely used in various precision machinery, power transmission, automation, semiconductor, medical and aerospace industries to provide precision transmission functions to make the loaded machine or object move in a straight line.

Generally, the ball screw mainly includes a screw and a nut. The nut is sleeved on the outside of the screw and can move relative to the shaft. The end of the nut is assembled with end components. The end components include a circulator, an end cover, and a wiper. Components such as plates and lubricating parts.

However, the current ball screw circulator, end cap, wiper plate, and lubricating parts are all independent components and require labor to be assembled to the end of the nut before pre-assembly, which increases labor costs and affects the overall assembly accuracy. In addition, the circulator, the end cover, the wiper plate and the lubricating element are stacked on each other and assembled on the end of the nut. For example, the wiper plate and the lubricating element are stacked on the outer surface of the end cap, resulting in the assembly of the nut and the end assembly. The length is greatly increased, thereby reducing the movable stroke of the nut on the screw.

In view of the foregoing, in one embodiment, a nut end cover of a ball screw device is provided, which includes an annular cover plate, a ball circulator, and a screw wiper blade. The ring-shaped cover plate includes an inner ring surface and opposite inner and outer surfaces. The inner ring surface surrounds and forms an axial perforation, and the axial perforation penetrates the inner surface and the outer surface. The ball circulator extends axially from the inner surface of the annular cover plate. The screw wiper blade is located in the axial perforation and extends radially from the inner ring surface between the inner surface and the outer surface.

In another embodiment, there is provided a ball screw device including a screw, a nut, and a nut end cover. The screw includes an outer spiral channel, and the outer spiral channel is arranged on the outer circumference of the screw. The nut is sleeved on the outside of the screw. The nut includes an axial cylinder. The axial cylinder has a ring-shaped inner surface and axially opposite first and second side surfaces. The ring-shaped inner surface has an inner spiral channel. The channel and the spiral channel outside the screw correspond to each other and jointly form a ball circulation channel. The nut end cover is sleeved on the outside of the screw and fixed on the first side surface of the nut. The nut end cover includes an annular cover plate, a ball circulator and a screw scraper blade. The annular cover plate includes an inner ring surface and an opposite The inner surface and the outer surface, the inner ring surface surrounds the axial perforation, the axial perforation penetrates the inner surface and the outer surface, the ball circulator extends axially from the inner surface of the annular cover plate and has a return curve, and the ball circulator extends into In the axial cylinder body, and the return curve is connected to the ball circulation channel, the screw wiper blade is located in the axial perforation and extends radially from the inner ring surface between the inner surface and the outer surface, and the screw wiper blade extends further into In the spiral channel outside the screw.

In summary, according to the present creative embodiment, the nut end cap and the ball screw device are integrally extended from the annular cover through the ball circulator and the screw scraper, which can reduce the manual assembly process and reduce the manufacturing cost, and also reduce the manufacturing tolerances. Improve the accuracy of the ball screw device with assembly tolerances. In addition, the screw wiper blade is located in the axial perforation and radially extends from the inner ring surface between the inner surface and the outer surface, so that the overall thickness of the nut end cover is reduced and the movement stroke of the nut can be increased.

Figure 1 is a perspective view of the first embodiment of the creative ball screw device, Figure 2 is an exploded perspective view of the first embodiment of the creative ball screw device, Figure 3 is a partial plan view of the first embodiment of the creative ball screw device, and Figure 4 is Figure 1 is a cross-sectional view along the line 4-4. As shown in FIGS. 1 to 4, the ball screw device 1 includes a screw 20, a nut 30 and at least one nut end cover 10.

1 to 4, the screw 20 includes an outer spiral channel 201, the outer spiral channel 201 is arranged on the outer circumference of the screw 20, in this embodiment, the outer spiral channel 201 is along the axis of the screw 20 It is formed in a circular direction and set at the required pitch.

As shown in Figures 1 to 4, the nut 30 is sleeved on the outside of the screw 20. The nut 30 includes an axial cylinder 31. The axial cylinder 31 has an annular inner surface 313 and an axially opposite first side surface 311 and On the second side surface 312, the annular inner surface 313 surrounds the shaft hole 32 and has an inner spiral channel 314. In this embodiment, the inner spiral channel 314 is recessed on the annular inner surface 313 and is along the axis of the nut 30 It is formed in a circular direction and set at the required pitch. The inner spiral channel 314 of the nut 30 and the outer spiral channel 201 of the screw 20 correspond to each other and can mesh with each other. In addition, the inner spiral channel 314 of the nut 30 and the outer spiral channel 201 of the screw 20 correspond to each other to form a ball circulation channel, wherein the ball circulation channel is used to accommodate a plurality of balls B, so that the nut 30 and the screw 20 borrow The plurality of balls B are brought into a rolling contact state, so that the nut 30 and the screw 20 can move relative to each other in the axial direction and reduce the frictional force during the relative movement, thereby reducing the driving torque.

In some implementations, the aforementioned nut 30 may be formed by processing a metal block or columnar blank. For example, the processing method may be casting processing or forging processing. In addition, during the manufacturing process, the nut 30 can be further processed (for example, grinding or turning-milling) to add or drill flange holes, oil injection holes, return holes, etc., or change the nut 30 The appearance and shape, and even the surface heat treatment of the nut 30 to enhance the hardness of the nut 30, is not limited to this creation.

As shown in Figures 1 to 4, in this embodiment, the ball screw device 1 includes two nut end caps 10, 10', and the two nut end caps 10, 10' are sleeved on the outside of the screw 20 and are respectively fixed to The first side surface 311 and the second side surface 312 of the nut 30, for example, each nut end cap 10, 10' can be fixed to the nut 30 by means of adhesion, snapping, or locking. Here, the two nut caps The end caps 10, 10' are respectively locked to the first side surface 311 and the second side surface 312 of the nut 30 with a plurality of screws 40, but this is not limited.

In some embodiments, the structures of the two nut end caps 10, 10' can be the same or different, as shown in FIGS. 1 to 4. In this embodiment, the two nut end caps 10, 10' have the same structure Therefore, only one of the nut end caps 10 will be used for the specific structure description below, which will be described first. However, this embodiment is only an example, and the structure of the two nut end caps 10, 10' can also be different, or only the first side surface 311 of the nut 30 can be provided with the nut end cap 10, which is not limited.

As shown in Figures 1 to 4, the nut end cover 10 includes an integrally formed annular cover plate 11, a ball circulator 12 and a screw scraper blade 13, such as an annular cover plate 11, a ball circulator 12 and a screw scraper The sheet 13 can be integrally manufactured and formed through processing methods such as injection molding, casting, or milling. In this embodiment, the ring-shaped cover plate 11 has an annular shape and includes an inner ring surface 113 and opposite inner and outer surfaces 111 and 112. The inner ring surface 113 surrounds and forms an axial perforation 114, and the axial perforation 114 penetrates the inner surface. 111 and the outer surface 112, the screw 20 is inserted into the axial through hole 114 of the annular cover 11 so that the nut end cover 10 is sleeved on the outside of the screw 20, and the inner surface 111 of the annular cover 11 abuts and is fixed to the screw The first side surface 311 of the cap 30 enables the nut end cover 10 and the nut 30 to perform relative axial relative movement relative to the screw 20 together.

As shown in Figures 1 to 4, the ball circulator 12 extends axially from the inner surface 111 of the annular cover 11 and has a return curve 122. The ball circulator 12 extends into the axial cylinder 31 and has a return curve. 122 is connected to the ball circulation channel formed by the inner spiral channel 314 and the outer spiral channel 201, so that when the nut 30 and the screw 20 move relative to each other, the plurality of balls B can be turned through the return curve 122 of the ball circulator 12 And continue to circulate back and roll in the ball circulation channel.

As shown in Figures 1 to 4, the screw wiper blade 13 is located in the axial perforation 114 and extends radially from the inner ring surface 113 between the inner surface 111 and the outer surface 112, that is, the screw wiper blade 13 is integrally formed within the thickness of the annular cover 11 (that is, the thickness formed between the inner surface 111 and the outer surface 112), and the screw wiper blade 13 further extends into the spiral channel 201 outside the screw 20. When the screw When 20 and the nut 30 move relative to each other, the screw scraper blade 13 can remove debris, residue or dust in the spiral channel 201, and provide dust-proof and oil-sealing effects at the same time to ensure that multiple balls B can be Smooth movement in the ball circulation channel. In addition, in this embodiment, the thickness of the screw wiper blade 13 is smaller than the thickness of the annular cover 11, and the screw wiper blade 13 is a crescent-shaped sheet, but this is not limited. The screw wiper blade 13 is also It can be a piece of other shapes.

As a result, the nut end cover 10 of the present creative embodiment is integrally extended from the annular cover plate 11 through the ball circulator 12 and the screw wiper blade 13, which can reduce the manual assembly process and reduce the manufacturing cost, and also reduce the manufacturing tolerance and The assembly tolerance improves the accuracy of the ball screw device 1. In addition, the ball circulator 12 integrally extends axially from the inner surface 111 of the annular cover 11, and the screw wiper blade 13 is located in the axial perforation 114 and extends radially from the inner annular surface 113 and is interposed between the annular cover. Within the thickness between the inner surface 111 and the outer surface 112 of 11, compared with the conventional stacked end assembly, the volume and thickness of the nut end cap 10 of this creative embodiment is smaller, thereby reducing the nut end The cover 10 is assembled on the entire length of the nut 30 to increase the movable stroke of the nut 30 relative to the screw 20.

As shown in FIGS. 1 to 4, in this embodiment, the annular cover plate 11 of the nut end cover 10 further includes an annular flange 115, and the annular flange 115 is integrally and axially extended from the annular cover plate 11. The inner surface 111 of the ring surrounds the periphery of the axial through hole 114, and the ball circulator 12 is more integrally connected to the annular flange 115. In addition, the annular flange 115 is located in the axial cylinder 31 and correspondingly abuts against the annular inner surface 313 of the axial cylinder 31 of the nut 30, whereby the nut end cap 10 is assembled on the nut 30 During the process, the nut end cap 10 can be aligned through the annular flange 115 to improve the efficiency and accuracy of assembly.

Figure 5 is an exploded perspective view of the second embodiment of the creative ball screw device. Figure 6 is a cross-sectional view of the second embodiment of the creative ball screw device. The difference is at least that the ball screw device 1 further includes a lubricating element 14, which is arranged in the axial cylinder 31 and adjacent to the nut end cover 10. The lubricating element 14 is used to lubricate the screw 20, the nut 30, and more. The single ball B makes the relative movement of the screw 20 and the nut 30 smoother, reduces friction and abrasion, and increases the service life. In some embodiments, the lubricating member 14 may be made of a porous resin material and impregnated with a lubricant to provide and maintain the lubricity of the contact surface between the screw 20, the nut 30 and the plurality of balls B for a long time.

As shown in FIGS. 5 and 6, in this embodiment, the first side surface 311 of the axial cylinder 31 of the nut 30 is provided with a groove 315, and the groove 315 communicates with the shaft hole 32, and the lubricating member 14 is C The lubricating element has a notch 141, and the lubricating element 14 is accommodated in the groove 315 and located in the axial cylinder 31. In addition, after the nut end cover 10 is assembled and fixed to the first side surface 311 of the nut 30, the annular flange 115 of the nut end cover 10 abuts on the lubricating element 14 so that the lubricating element 14 is positioned, and the ball The circulator 12 corresponds to the notch 141 of the lubricating element 14 to avoid interference between the nut end cover 10 and the lubricating element 14 during assembly. Thereby, the lubricating member 14 can contact the surface of the screw 20 to transfer the lubricant to the contact surface between the screw 20, the nut 30 and the plurality of balls B. In addition, the lubricating member 14 is accommodated in the recess of the nut 30 In the groove 315, the length of the nut end cap 10 after the nut 30 is assembled will not increase.

FIG. 7 is a partial exploded perspective view of the third embodiment of the creative ball screw device, and FIG. 8 is a cross-sectional view of the third embodiment of the creative ball screw device. As shown in Figures 7 and 8, the difference between this embodiment and the above-mentioned first and second embodiments is at least that the lubricating element 14a of this embodiment is assembled on the annular cover plate 11 and located on the ball circulator 12 and the outer surface. 112, that is to say, the lubricating element 14a is also within the thickness of the nut end cover 10a, so that the lubricating element 14a and the screw wiper blade 13 can be simultaneously provided with the lubricating element 14a and the screw wiper blade 13 within the thickness range of the nut end cover 10a, and have both lubrication and scraping. Brush function.

7 and 8, in this embodiment, the screw wiper blade 13 is located in the axial through hole 114 and adjacent to the outer surface 112, and the inner surface 111 of the annular cover plate 11 of the nut end cover 10a is more A groove 116 is provided, and the groove 116 is connected to the axial through hole 114. The lubricating element 14a is accommodated in the groove 116 and extends into the axial cylinder 31 of the nut 30, so that the lubricating element 14a can be inserted between the nut Within the thickness of the end cap 10a, and when the screw 20 is assembled in the axial through hole 114, the lubricating member 14 can contact the surface of the screw 20 to provide a lubricating effect. In addition, in this embodiment, the groove 116 is a C-shaped groove, the lubricating element 14a is a C-shaped lubricating element and has a gap 141a, and the ball circulator 12 corresponds to the gap 141a, so that the lubricating element 14a can be directly inserted into the groove. 116 to avoid interference with the ball circulator 12.

9 is a partial exploded perspective view of the fourth embodiment of the creative ball screw device, and FIG. 10 is a cross-sectional view of the fourth embodiment of the creative ball screw device. As shown in FIGS. 9 and 10, the difference between this embodiment and the above-mentioned third embodiment is at least that the groove 116' provided on the inner surface 111 of the annular cover plate 11 of the nut end cover 10b of this embodiment is The annular groove, the lubricating element 14b is an annular lubricating element, the ball circulator 12 is provided with an avoiding groove 121 on one side adjacent to the annular cover 11, and the avoiding groove 121 is connected to the groove 116', so that the annular lubricating element 14b can pass through the avoiding The groove 121 is laterally installed into the annular groove 116' to avoid interference. Thereby, when the screw 20 is assembled in the axial through hole 114, the lubricating member 14b can surround the surface of the screw 20 to increase the area of lubrication.

In some embodiments, the screw wiper blade 13 may also be located in the axial through hole 114 and adjacent to the inner surface 111, and the groove 116 (groove 116') may be adjacent to the outer surface 112 to accommodate the lubricating member 14a ( The lubricating element 14b), or the screw wiper blade 13 and the lubricating element 14a (lubricating element 14b) can also be both adjacent to the inner surface 111 or the outer surface 112. For example, as shown in Figures 11 and 12, Figure 11 is a partial exploded perspective view of the fifth embodiment of the creative ball screw device, and Figure 12 is a cross-sectional view of the fifth embodiment of the creative ball screw device, this embodiment and the above-mentioned fourth embodiment The difference between the examples is at least that the nut end cap 10c of this embodiment is provided with a groove 1131 on the inner ring surface 113. The groove 1131 is an annular groove, but it can also be a C-shaped groove or a semicircular groove. 1131 communicates with the axial through hole 114, the lubricating member 14c is annular and is accommodated in the groove 1131, and the screw wiper blade 13 and the lubricating member 14c are both adjacent to the inner surface 111 of the annular cover 11, but this is not limited . In other embodiments, the lubricating element 14c can also be adjacent to the outer surface 112 of the annular cover 11, or both the screw wiper blade 13 and the lubricating element 14c are adjacent to the outer surface 112 of the annular cover 11.

In some embodiments, the lubricating elements 14, 14a, 14b, and 14c of the above embodiments have a screw contact surface. The screw contact surface is used to contact the surface of the screw 20 to generate lubrication, and the screw contact surface may be serrated. In order to reduce the contact area between the screw contact surface and the surface of the screw 20, the lubricating elements 14, 14a, 14b, and 14c can avoid excessive resistance to the screw 20. For example, as shown in FIG. 7, in this embodiment, the lubricating member 14a is a C-shaped lubricating member and has a C-shaped screw contact surface 142a, and the screw contact surface 142a is in a sawtooth shape, or as shown in FIG. 11, In this embodiment, the lubricating element 14c is an annular lubricating element and has an annular screw contact surface 142c, and the screw contact surface 142c is in a sawtooth shape.

Although the technical content of this creation has been disclosed in a preferred embodiment as above, it is not intended to limit this creation. Anyone who is familiar with this technique, who does not deviate from the spirit of this creation, makes some changes and modifications, should be covered in this creation. Therefore, the scope of protection of this creation shall be subject to the scope of the attached patent application.

1: Ball screw device 10,10’,10a, 10b,10c: screw cap end caps 11: Ring cover 111: inner surface 112: Outer surface 113: inner ring surface 1131: Groove 114: Axial perforation 115: Ring flange 116,116’: Groove 12: Ball circulator 121: Avoidance Slot 122: Return curve 13: Screw scraper 14,14a,14b,14c: lubricating parts 141, 141a: gap 142a, 142c: screw contact surface 20: Screw 201: Outer spiral channel 30: Nut 31: Axial cylinder 311: first side 312: second side 313: Ring inner surface 314: Inner Spiral Channel 315: Groove 32: Shaft hole 40: screw B: Ball

[Figure 1] It is a perspective view of the first embodiment of the ball screw device of this creation. [Fig. 2] It is an exploded perspective view of the first embodiment of the ball screw device of the invention. [Figure 3] It is a partial plan view of the first embodiment of the ball screw device of the present creation. [Figure 4] It is a cross-sectional view of Figure 1 along line 4-4. [Figure 5] It is an exploded perspective view of the second embodiment of the ball screw device of the invention. [Figure 6] is a cross-sectional view of the second embodiment of the ball screw device of the invention. [Figure 7] is a partial exploded perspective view of the third embodiment of the ball screw device of the invention. [Figure 8] is a cross-sectional view of the third embodiment of the ball screw device of the invention. [Figure 9] is a partial exploded perspective view of the fourth embodiment of the ball screw device of the invention. [Figure 10] is a cross-sectional view of the fourth embodiment of the ball screw device of the present invention. [Figure 11] is a partial exploded perspective view of the fifth embodiment of the ball screw device of the invention. [Figure 12] is a cross-sectional view of the fifth embodiment of the ball screw device of the invention.

1: Ball screw device

10,10’: Screw cap end cap

11: Ring cover

111: inner surface

112: Outer surface

113: inner ring surface

114: Axial perforation

115: Ring flange

12: Ball circulator

122: Return curve

13: Screw scraper

20: Screw

201: Outer spiral channel

30: Nut

31: Axial cylinder

311: first side

312: second side

32: Shaft hole

40: screw

B: Ball

Claims (20)

A nut end cap of a ball screw device, including: A ring-shaped cover plate, comprising an inner ring surface, an inner surface and an outer surface opposite to each other, the inner ring surface surrounds and forms an axial perforation, the axial perforation penetrates the inner surface and the outer surface; A ball circulator extending axially from the inner surface of the annular cover plate; and A screw scraper blade is located in the axial through hole and radially extends from the inner ring surface and is interposed between the inner surface and the outer surface. The nut end cap of the ball screw device according to claim 1, wherein the screw scraper blade is a crescent-shaped piece. The nut end cover of the ball screw device according to claim 1, wherein the annular cover plate further includes an annular flange, and the annular flange integrally extends axially from the inner surface. The nut end cover of the ball screw device described in claim 1 further includes a lubricating element assembled on the annular cover plate and located between the ball circulator and the outer surface. The nut end cap of the ball screw device according to claim 4, wherein the lubricating member has a screw contact surface, and the screw contact surface is sawtooth-shaped. The nut end cover of the ball screw device according to claim 4, wherein the inner ring surface of the annular cover plate is provided with a groove, the groove is connected to the axial through hole, and the lubricating member is accommodated in the groove Slot. The nut end cover of the ball screw device according to claim 4, wherein the inner surface of the annular cover plate is provided with a groove, the groove is connected to the axial through hole, and the lubricating member is accommodated in the groove in. The nut end cap of the ball screw device according to claim 7, wherein the groove is a C-shaped groove, the lubricating element is a C-shaped lubricating element and has a gap, and the ball circulator corresponds to the gap . The nut end cap of the ball screw device according to claim 7, wherein the groove is an annular groove, the lubricating element is an annular lubricating element, and the ball circulator is provided with a side adjacent to the annular cover plate The avoidance groove is connected to the annular groove. A ball screw device includes: A screw, including an outer spiral channel, the outer spiral channel is arranged on the outer circumference of the screw; A nut is sleeved on the outside of the screw. The nut includes an axial cylinder. The axial cylinder has an annular inner surface and a first side and a second side axially opposite to each other. The annular The inner surface has an inner spiral channel, the inner spiral channel and the outer spiral channel of the screw correspond to each other and jointly form a ball circulation channel; and A nut end cover sleeved on the outside of the screw and fixed on the first side surface of the nut. The nut end cover includes an annular cover plate, a ball circulator and a screw scraper blade. The cover plate includes an inner ring surface and an opposite inner surface and an outer surface. The inner ring surface surrounds and forms an axial perforation. The axial perforation penetrates the inner surface and the outer surface. The ball circulator extends axially from The inner surface of the annular cover plate has a return curve, the ball circulator extends into the axial cylinder, and the return curve is connected to the ball circulation channel, and the screw scraper blade is located in the axial perforation Inner and radially extending from the inner ring surface and between the inner surface and the outer surface, the screw wiper blade further extends into the outer spiral channel of the screw. The ball screw device according to claim 10 further includes a lubricating member disposed in the axial cylinder and adjacent to the nut end cover. The ball screw device according to claim 11, wherein the nut includes a shaft hole, the first side surface of the nut is provided with a groove, the groove communicates with the shaft hole, and the lubricating member is accommodated in the groove . The ball screw device according to claim 10, wherein the screw wiper blade is a crescent-shaped blade. The ball screw device according to claim 10, wherein the annular cover plate further includes an annular flange, and the annular flange integrally extends axially from the inner surface and is located in the axial cylinder. The ball screw device according to claim 10, further comprising a lubricating element which is assembled on the annular cover plate and located between the ball circulator and the outer surface. The ball screw device according to claim 15, wherein the lubricating member has a screw contact surface, and the screw contact surface is serrated. The ball screw device according to claim 15, wherein the inner ring surface of the annular cover plate is provided with a groove, the groove communicates with the axial through hole, and the lubricating member is accommodated in the groove. The ball screw device according to claim 15, wherein the inner surface of the annular cover plate is provided with a groove, the groove communicates with the axial through hole, and the lubricating member is accommodated in the groove. The ball screw device according to claim 18, wherein the groove is a C-shaped groove, the lubricating member is a C-shaped lubricating member and includes a notch, and the ball circulator corresponds to the notch. The ball screw device according to claim 18, wherein the groove is an annular groove, the lubricating member is an annular lubricating member, and the ball circulator is provided with an avoiding groove on one side adjacent to the annular cover plate, and the avoiding groove The groove is connected to the annular groove.

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