TWM473458U - Roller screws - Google Patents

Description

Roller screw

This creation is a linear transmission element, especially a path improvement of a circulating element of a roller screw.

For example, US Bulletin No. 3192791 is an externally circulating roller screw, and US Bulletin No. 8272289 is an end plug type roller screw. Both of these patents disclose a common feature, that is, the roller enters the circulating component. In the circulation path, the roller will be turned 90 degrees in the straight section of the circulation path. In this way, the placement angle of the roller in and out of the circulation path can be made uniform, and the roller screw can have the same axis direction during operation. The load capacity; however, when the roller is turned over, the length of the roll is short, and the roller needs to be severely twisted under a limited length, causing the roller to interfere or collide with the wall surface of the circulation path, resulting in The roller screw cycle is not smooth and the life is shortened. Therefore, it is necessary to improve this problem.

In view of the above problems, the main purpose of this creation is to develop a circulation path for better smoothness when the roller screw is running.

In order to achieve the above object, the present invention is a roller screw comprising: a screw which is elongated into a long strip structure in one direction, and a spiral rolling groove is arranged on the outer edge surface of the screw; a nut system a perforation for the screw sleeve is provided, the inner edge surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path; a circulating element is disposed on the nut, The circulation element has a circulation path, and the two ends of the circulation path are respectively connected to the two ends of the load path to form a running path, and the circulating path has a linear inversion section; the plurality of rollers are disposed in the running path; The angle between the roller entering and exiting the straight line inversion section is about 90 degrees, and the length of the straight line inverting section is more than 3 times the diameter of the roller.

Preferably, the diameter of the roller and the length of the straight-turning section are in accordance with the following relationship: 3≦L/RD≦50; L: the length of the straight-turning section; RD: the diameter of the roller.

1‧‧‧ screw
11‧‧‧ rolling groove
2‧‧‧ nuts
21‧‧‧Perforation
211‧‧‧ rolling groove
22‧‧‧Installation slot
3‧‧‧End plug
31‧‧‧Return
4‧‧‧ Straight tube
41‧‧‧Line flip section
5‧‧‧roller
L‧‧‧ length
RD‧‧‧diameter
6‧‧‧cycle components
7‧‧‧Fixed parts

The first figure is a system diagram of the roller screw of the first preferred embodiment of the present invention.
The second figure is a combination view of the roller screw of the first preferred embodiment of the present invention.
The third drawing is a cross-sectional view of the roller screw of the first preferred embodiment of the present invention.
The fourth figure is a combination view of the roller screw of the first preferred embodiment of the present invention, and the nut is presented in perspective.
The fifth figure is a perspective view of the straight tube and the roller of the circulating element of the roller screw of the first preferred embodiment of the present invention.
The sixth figure is a combination diagram of the roller screw of the second preferred embodiment of the present invention, which is an outer circulation type.
The seventh figure is a force analysis diagram for the creation of the roller in the straight line flip section.

Referring to the first to fifth and seventh figures, the first preferred embodiment of the present invention, the embodiment is a roller screw, comprising: a screw (1) along a The direction is elongated into a long strip structure, and the outer edge surface of the screw (1) is provided with a spiral rolling groove (11); a nut (2) is provided with a perforation (21) for the screw (1) The inner edge surface of the through hole (21) is provided with a rolling groove (211) opposite to the rolling groove (11), and the rolling groove (11) and the rolling groove (211) form a load path, and the through hole (21) The two ends are respectively provided with a mounting groove (22), and the two mounting grooves (22) are connected by a through hole; a circulating component, in the embodiment, the circulating component is composed of two ends (3) and a straight line The tube (4) is configured, and the two end plugs (3) are respectively provided with a return passage (31), wherein the straight tube (4) is provided with a linear inversion section (41), and the two end plugs (3) are respectively disposed on Two mounting slots (22), the straight tube (4) is disposed in the through hole, and one end of the two return runners (31) and the straight line flipping section (41) the connection constitutes a circulation path, the two ends of the circulation path are respectively connected with the two ends of the load path to form a running path; the plurality of rollers (5) are disposed on the running path; and the roller ( 5) The angle between the in and out of the straight-turning section (41) differs by about 90 degrees, so that the angles of the rollers (5) after the entry and exit of the loop path are consistent. Referring to the fifth figure, in order to improve the smoothness of the roller (5) when the straight line flip section (41) is reversed, the length (L) of the straight line flip section (41) is specifically set as a roller (5). 3 times larger than the diameter (RD), as can be seen from the seventh figure, when the length (L) of the straight-turning section (41) is more than 3 times the diameter (RD) of the roller (5), it can be reduced by 75%. Force, which is the force of the roller (5) pushing the wall surface of the straight-turning section (41), because the length of the straight-turning section (41) must match the length dimension of the nut (2) and cannot extend indefinitely Therefore, 3 times is the most appropriate design, so that the nut (2) size meets the standard specifications and the roller can run smoothly.

For the relationship between the length of the straight-turning section of different sizes of roller screws and the diameter of the roller, the specifications of the roller screw commonly used in the industry are calculated. After finishing, it is defined by the following relationship: 3≦L /RD≦50;L: the length of the straight line flip section; RD: the diameter of the roller, so for different sizes of roller screws, as long as the size of the straight line flip section selected for this range is designed to obtain better roller running time Smoothness.

Please refer to the sixth embodiment, which is a second preferred embodiment of the present invention. The difference between this embodiment and the second preferred embodiment lies in the design of the circulating component, which is an outer loop type, and the first preferred The embodiment is of the end plug type, so it can be clearly seen from the sixth figure that the outer edge surface of the nut (2) is provided with a circulating element (6) which is fixed by a fixing member (7). On the outer peripheral surface of the nut (2), the circulation element (6) is provided with the same circulation path as the first preferred embodiment, and has a linear inversion section (not shown), and the design of the linear inversion section The same as the first preferred embodiment, the effect of the first preferred embodiment can also be achieved.

In view of the above, the "industry availability" of this creation should be unquestionable. In addition, the characteristic techniques revealed in the examples in this case have not been seen in publications before, and have not been disclosed. The use, not only has the fact that the effect is improved as described above, but also has additional functions that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the creation have been in compliance with the patent regulations, and the application for creating a patent is proposed according to law. Please give us a review and grant a patent as soon as possible.

The above description of the embodiments is intended to illustrate the present invention and is not intended to limit the present invention. Therefore, variations of numerical values and substitution of equivalent elements are still within the scope of the present invention.

4‧‧‧ Straight tube

41‧‧‧Line-turning section

5‧‧‧roller

L‧‧‧ length

RD‧‧‧diameter

Claims (2)

A roller screw comprises: a screw which is elongated into a long strip structure in one direction, a spiral rolling groove is arranged on the outer edge surface of the screw; and a nut is provided with a perforation for the screw sleeve. The inner edge surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path; a circulation element is disposed on the nut, the circulation element has a circulation path, the circulation path The two ends of the load path are respectively connected to the two ends of the load path to form a running path, and the circulating path has a straight-line turning section; the plurality of rollers are disposed in the running path; wherein the roller enters and exits the straight-line turning section The angle between the two differs by about 90 degrees, and the length of the straight-turned section is more than three times the diameter of the roller. The roller screw of claim 1, wherein the diameter of the roller and the length of the straight-turning section are in accordance with the following relationship: 3≦L/RD≦50; L: length of the straight-turning section; RD: roller The diameter.