CN103697130B - Nut Rotary Linear Actuation Elements - Google Patents

Abstract

The invention discloses a nut rotation type linear transmission element, comprising: a lever shaft; the nut is sleeved on the rod shaft, an annular outer rolling groove and an annular step part are arranged on the outer edge surface of the nut, and the annular step part is provided with a sleeving surface and an end surface; the outer sleeve part is provided with a through hole sleeved on the screw cap, the inner edge surface of the through hole is provided with a first inner rolling groove corresponding to the outer rolling groove, the outer rolling groove and the first inner rolling groove form a first load path, and the inner edge surface of the through hole is additionally provided with a second inner rolling groove; the ring sleeve part is provided with a through hole sleeved on the sleeving surface of the annular step part, the ring sleeve part is provided with an outer rolling groove corresponding to the second inner rolling groove, the second inner rolling groove and the outer rolling groove form a second load path, and the first load path and the second load path are respectively provided with a second rolling part; with the structure, the track surface can be free from damage, so that a complete track surface is reserved, and the function of adjusting the pre-pressure is achieved, so that the pre-pressure requirement of various industries is met.

Description

Nut Rotary Linear Actuation Elements

technical field

The invention relates to a linear transmission element, in particular to a nut rotary linear transmission element.

Background technique

Nut rotary linear transmission components The transmission components described are ball screws or roller screws, which are often used in long-travel machines. In the past, the screw was often used to drive the screw to drive the displacement of the nut. However, due to the long screw, it is easy to sag and critical. Problems such as too low speed may lead to problems such as unsmooth movement and short product life; and the power source drives the nut of the transmission element to rotate, and the nut drives the bed to move, so it can avoid the problems caused by the power source driving the screw of the transmission element. The resonance phenomenon generated, and the critical speed of the transmission element is increased to meet the needs of various machines. As the name implies, the nut rotary linear transmission element is to install a bearing on the existing nut of the original transmission element, and the outer surface of the bearing The ring is fixed to the machine table, and the inner ring is fixed to the nut, so the power source can drive the nut, make the nut rotate and reciprocate in a straight line relative to the screw rod, and achieve the purpose of driving the bed.

For example, Patent No. I254106 announced in Taiwan, China is one of the forms of a nut-rotating transmission element, and the main problem to be solved in this patent is: the assembly problem of the nut-rotating transmission element. To solve this problem, the main technical means proposed is to provide a through hole for filling the ball on the bearing sleeve, so as to facilitate filling the ball into the annular bead groove. However, because the through hole is set, the track of the annular bead groove There is a damage on the surface, and a fixing piece must be used to fill the damage, but the fixing piece often cannot make the damage fill smoothly, resulting in a gap, and the gap will make the ball not run smoothly Frustration and vibration are generated, so the positioning accuracy of the transmission element is greatly reduced, and the wear and tear will become more and more serious once the vibration is generated, so the service life of the transmission element is also shortened; moreover, the setting of the fixing part is also reduced The reason is that the load capacity of the transmission element depends on the amount of contact between the ball and the track surface, so even if the damaged part is filled by the fixing part, the filled damaged part does not have any damage. The load capacity is only the ability to prevent the balls from falling out of the annular bead groove, so setting more through holes relatively reduces the load capacity of the transmission element; in summary, the design of this prior art still needs to be improved.

Contents of the invention

The object of the present invention is to provide a nut rotary linear transmission element, the assembly structure of which can prevent the track surface from being damaged, so as to retain a complete track surface.

Another object of the present invention is to provide a nut rotary linear transmission element, which can achieve the function of adjusting the preload to meet the requirements of various industries for the size of the preload.

In order to achieve the above object, the solution of the present invention is:

A nut rotary linear transmission element, comprising:

A shaft, which is a strip-shaped structure, the outer surface of the shaft is provided with a spiral rolling groove; a nut, which has a perforation for the shaft to pass through, and the inner surface of the perforation is provided with Relative to the rolling groove of the rolling groove, the rolling groove and the rolling groove form a load path, and the load path is provided with a plurality of first rolling elements; the outer edge surface of the nut is provided with an annular outer rolling groove, and the outer rolling groove One side of the ditch is provided with an annular step portion, the annular step portion has a set surface and an end surface; an outer sleeve, which has a set of through holes set on the nut, and the inner edge of the through hole is provided with Relative to the first inner rolling groove of the outer rolling groove, the outer rolling groove and the first inner rolling groove form a first load path, and a second inner rolling groove is provided on the inner edge surface of the through hole; a ring kit, its There is a through hole set on the sleeve surface of the annular step part, the ring sleeve is provided with an outer rolling groove opposite to the second inner rolling groove, and the second inner rolling groove and the outer rolling groove form a second load path; wherein, the first load path and the second load path are respectively provided with a plurality of second rolling elements; the first inner rolling groove and the second inner rolling groove are a quarter arc, and two quarters A circular arc is set opposite to each other; the axial length of the outer sleeve is greater than the axial length of the ring sleeve.

The above-mentioned ring set is provided with a plurality of fixing holes penetrating in the axial direction, and the end surface of the annular step portion of the nut is provided with a plurality of screw holes, and the ring set is passed behind the fixing hole by a plurality of screws, and each screw Screwed and locked with the screw hole, the ring set is fixed on the set surface.

A sheet-shaped pre-compression piece is provided between one end surface in the axial direction of the ring set and the end surface of the annular step portion.

After adopting the above-mentioned structure, the assembly structure of the bearing set of the nut rotary linear transmission element of the present invention mainly focuses on the design of the ring set and the ring-shaped step part of the nut. When assembling, the nut is first sleeved on the The rod shaft, and then set the first rolling element on the load path, and then stick the second rolling element on the outer rolling groove with grease, and cover the entire outer rolling groove, and then, the outer sleeve The through hole is sleeved on the nut, so that the first inner rolling groove is against the second rolling element, and then, the second rolling element is glued on the outer rolling groove of the ring set with grease, and then the The through hole of the ring set is set on the set surface, and the through hole and the set surface are closely fitted, so that the ring set can be stably set on the set surface, and the fixed The hole is arranged relative to the screw hole. At this time, the second rolling element on the ring set is against the second inner rolling groove. Finally, after a plurality of the screws are passed through the fixing hole, each of the screws and the screw The holes are screwed and locked; in addition, with the assembly structure of the present invention, the preload between the first load path, the second load path and the second rolling element can also be adjusted by screws, provided that the end surface of the ring set must be There is a gap between the end surface of the ring-shaped step part, so the size of the gap can be adjusted by the locking force of each screw. If the gap is smaller, it means that the first load path, the second The greater the preload between the load path and the second rolling element, the smaller the preload is vice versa. Therefore, the assembly structure of the present invention can not only maintain a complete track surface, but also achieve the function of adjusting the preload to meet The requirements of various industries for the pre-pressure size.

Description of drawings

Fig. 1 is the exploded view of the nut rotary linear transmission element of the first preferred embodiment of the present invention;

Fig. 2 is the assembly diagram of the nut rotary linear transmission element of the first preferred embodiment of the present invention;

Fig. 3 is an axial sectional view of Fig. 2;

Fig. 4 is an exploded view of the nut rotary linear transmission element of the second preferred embodiment of the present invention;

Fig. 5 is a cross-sectional view of a nut rotary linear transmission element according to a second preferred embodiment of the present invention;

Fig. 6 is an exploded view of a nut rotary linear transmission element according to a third preferred embodiment of the present invention;

Fig. 7 is a combination diagram of the nut rotary linear transmission element in the third preferred embodiment of the present invention;

Fig. 8 is an axial sectional view of Fig. 7 .

Description of main component symbols

1 rod shaft 11 rolling groove 2 nut

21 Perforation 211 Rolling groove 22 Outer rolling groove

23 ring-shaped step part 231 sleeve surface 232 end face

24 screw holes 3, 3A outer kit 31 through holes

311 first inner rolling groove 312 second inner rolling groove

4 ring kit 41 through hole 42 outer rolling groove

43 Fixing hole 44 End face 5 The first rolling element

9 second rolling element 6 screw 7 return element

8 pre-pressed sheets 81 holes 90 load paths

100 first load path 101 second load path

C clearance in the X-axis direction.

detailed description

In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

Please refer to Figures 1 to 3, which are the first preferred embodiment of the present invention. The present invention provides a nut rotary linear transmission element, including: a rod shaft 1, a nut 2, an outer sleeve 3, A ring set 4, a return element 7, a plurality of screws 6, a first rolling element 5 and a plurality of second rolling elements 9;

The rod shaft 1 is elongated in one direction, and the extension direction is defined as the axial direction X, and the outer edge surface of the rod shaft 1 is provided with a spiral rolling groove 11;

The nut 2 has a perforation 21 for the shaft 1 to pass through. The inner edge of the perforation 21 is provided with a rolling groove 211 opposite to the rolling groove 11. The rolling groove 11 and the rolling groove 211 form a load path 90 , the load path 90 is provided with a plurality of first rolling elements 5, the first rolling elements 5 can be rollers or balls, the present embodiment is balls; the outer edge surface of the nut 2 is provided with an annular outer rolling groove 22. One side of the outer rolling groove 22 is provided with an annular stepped portion 23, the annular stepped portion 23 has a set surface 231 and an end surface 232, and the end surface 232 is provided with a plurality of screw holes 24;

The return element 7 is arranged on the nut 2 to provide a plurality of the first rolling elements 5 to circulate back;

The outer sleeve 3 has a through hole 31 set on the nut 2, the inner edge surface of the through hole 31 is provided with a first inner rolling groove 311 opposite to the outer rolling groove 22, the outer rolling groove 22 and The first inner rolling groove 311 constitutes a first load path 100, and the inner edge surface of the through hole 31 is provided with a second inner rolling groove 312 on one side of the first inner rolling groove 311, the first inner rolling groove 311 and the second inner rolling groove 311 The two inner rolling grooves 312 are quarter arcs, and the two quarter arcs are arranged facing away from each other as shown in FIG. 3 ;

The ring set 4 has a through hole 41 set on the sleeve surface 231 of the annular step part 23, the ring set 4 is provided with a plurality of fixing holes 43 through which the axial direction X passes, and the ring set 4 is After a plurality of screws 6 are passed through the fixing hole 43, each screw 6 is screwed and locked with the screw hole 24, so that the ring set 4 is fixed on the sleeve surface 231; The outer rolling groove 42 of the inner rolling groove 312, the second inner rolling groove 312 and the outer rolling groove 42 form a second load path 101, and the first load path 100 and the second load path 101 are respectively provided with a plurality of second rolling grooves. member 9, the second rolling member 9 can be a roller or a ball, and this embodiment is a ball; in addition, the length of the axial direction X of the outer sleeve 3 is greater than the length of the axial direction X of the ring sleeve 4, and the outer sleeve 3 The length of the axial direction X of the nut 2 is smaller than the length of the axial direction X of the nut 2 .

In order to clearly illustrate the implementation characteristics of the present invention, the following descriptions of the present invention are more conventional and progressive and practical:

The assembly structure of the bearing set of the nut rotary linear transmission element of the present invention mainly focuses on the design of the ring set 4 and the annular step portion 23 of the nut 2. When assembling, the nut 2 is first set on the ring Shaft 1, and then the first rolling element 5 is arranged on the load path 90, and then the second rolling element 9 is glued on the outer rolling groove 22 with grease, and the entire outer rolling groove 22 is covered, and furthermore, Set the through hole 31 of the outer sleeve 3 on the nut 2, make the first inner rolling groove 311 abut against the second rolling element 9, and then stick the second rolling element 9 on the second rolling element 9 with grease. On the outer rolling groove 42 of the ring set 4 (note: because the grease is thick and sticky, the second rolling element 9 can be stuck on the outer rolling groove 22 or the outer rolling groove 42, and because the second rolling element 9 can be arranged in the outer rolling groove 22 or the outer rolling groove 42 in any direction, so for the silent transmission element, the second rolling member 9 must be installed on the chain or arranged between the spacers to form a rolling Module, the rolling module can be arranged in the open outer rolling groove 22 or outer rolling groove 42, so it is very simple and convenient to assemble for the silent transmission element, so as to shorten the assembly time, unlike the prior art. Balls and spacers or balls and chains are put into the track one by one from such a small through hole, so it must take a considerable amount of time to complete the assembly.), and then the through hole 41 of the ring set 4 is sleeved on the set On the surface 231, and the through hole 41 and the sleeve surface 231 are closely fitted, so that the ring set 4 can be stably arranged on the sleeve surface 231, and the fixing hole 43 is opposite to the screw hole. 24, at this time, the second rolling member 9 on the ring set 4 is against the second inner rolling groove 312, and finally, after passing through the fixing hole 43 with a plurality of the screws 6, each of the screws 6 and The screw hole 24 is screwed and locked; in addition, with the assembly structure of the present invention, the preload between the first load path 100, the second load path 101 and the second rolling member 9 can also be adjusted by the screw 6, The premise is that there must be a gap between the end face 44 of the ring set 4 and the end face 232 of the annular step portion 23 (note: the end face 44 of the ring set 4 drawn in FIG. 3 of the present invention and the end face of the annular step portion 23 There is no gap between 232 because the preload has been adjusted, so there is no gap between them, but assuming that there is still a gap between the end face 44 of the ring set 4 and the end face 232 of the annular step part 23 after the preload is adjusted, This type can also be implemented but its rigidity is poor (this type is also one of the implementation scope of the present invention, so the type without gap is the best implementation type), so, by the locking of each screw 6 Force to adjust the size of the gap, if the gap is smaller, it means that the preload between the first load path 100, the second load path 101 and the second rolling element 9 is greater, otherwise the preload is greater Therefore, the assembly structure of the present invention can not only maintain the complete track surface, but also achieve the function of adjusting the preload to meet the requirements of various industries for the size of the preload.

Please refer to Figures 4 to 5, which are the second preferred embodiment of the present invention. The difference between this embodiment and the first preferred embodiment is that it can be adjusted by the screw 6 mentioned in the first preferred embodiment. The preload between the first load path 100, the second load path 101 and the second rolling member 9, and the premise of adjusting the preload must be that the end surface 44 of the ring set 4 must be in contact with the end surface of the annular step portion 23 There is a gap C between 232. In this embodiment, two pre-compression pieces 8 are arranged in the gap C. The two pre-compression pieces 8 have a C-shaped structure, and they are inserted into the gap C from the radial direction to make the ring sleeve 4 The end surface 44 and the end surface 232 of the annular step portion 23 can be supported to increase the rigidity between them, and when the two pre-compression pieces 8 are installed, the two pre-compression pieces 8 are inserted into the gap C from the radial direction , and the two pre-pressed sheets 8 are respectively provided with holes 81 corresponding to the screw holes 24, and after the pre-pressed sheets 8 are installed, the holes 81 must be arranged relative to the screw holes 24 and the fixing holes 43, so that the screws 6 After passing through the fixing hole 43 and the hole 81 in sequence, they are screwed and locked with the screw hole 24, and the assembly operation of the bearing set is completed. The configuration and functions of the other components are the same as those of the first preferred embodiment. No more details.

Please refer to Fig. 6 to Fig. 8, which is the third preferred embodiment of the present invention. The difference between this embodiment and the first preferred embodiment is that the length of the outer sleeve 3A is longer than that of the outer sleeve 3 of the first preferred embodiment. The length is long, and the distance between the first inner rolling groove 311 and the second inner rolling groove 312 of the outer sleeve 3A of the present embodiment is relatively large, which can prevent the torque of the nut 2 from being generated when rotating and increase the rigidity to extend the transmission. The service life of the components, the configuration and functions of the other components are the same as those of the first preferred embodiment, and will not be repeated here.

The above-mentioned embodiments and drawings do not limit the form and style of the product of the present invention, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims (3)

1. A nut rotary linear transmission element, characterized in that, comprising: a rod shaft, which is a strip-shaped structure, and the outer edge surface of the rod shaft is provided with a spiral rolling groove; A nut, which has a perforation for the shaft to pass through, a rolling groove opposite to the rolling groove is provided on the inner edge of the perforation, the rolling groove and the rolling groove form a load path, and the load path is provided with a plurality of first A rolling element; the outer edge surface of the nut is provided with an annular outer rolling groove, and one side of the outer rolling groove is provided with an annular step portion, and the annular step portion has a set surface and an end surface; An outer sleeve, which has a through hole set on the nut, the inner edge of the through hole is provided with a first inner rolling groove opposite to the outer rolling groove, the outer rolling groove and the first inner rolling groove form a The first load path, the inner edge surface of the through hole is additionally provided with a second inner rolling groove; A ring set, which has a through hole set on the sleeve surface of the annular step part, the ring set is provided with an outer rolling groove opposite to the second inner rolling groove, the second inner rolling groove and the outer rolling groove forming a second load path; Wherein, the first load path and the second load path are respectively provided with a plurality of second rolling elements; Wherein, the first inner rolling groove and the second inner rolling groove are quarter arcs, and the two quarter arcs are arranged facing away from each other; Wherein, the axial length of the outer sleeve is greater than the axial length of the ring sleeve. 2. The nut rotary linear transmission element according to claim 1, characterized in that: the ring set is provided with a plurality of fixing holes penetrating in the axial direction, and the end surface of the annular step portion of the nut is provided with a plurality of screws hole, the ring set is passed behind the fixing hole by a plurality of screws, and each screw is screwed and locked with the screw hole, and the ring set is fixed on the sleeve surface. 3 . The nut rotary linear transmission element according to claim 1 , wherein a thin pre-compression piece is provided between an end surface of the ring sleeve in the axial direction and an end surface of the annular step portion. 4 .