TWI470156B - Roller screw with spacer - Google Patents

Description

Roller screw with spacer

The present invention is a roller screw with a spacer, wherein the spacer can prevent the rollers from contacting each other to reduce noise and avoid the effect of friction between the rollers.

Today's roller screws or linear slides are used more and more in industry. In addition to the high precision effect of the linear feed drive, other friction loss rates are small, energy conversion rate is high, noise is low and high. The rigidity is not easy to damage, so the importance of roller screws or linear slides for today's various industrial applications is not to mention.

One of the rolling elements commonly used in current roller screw or linear slide designs is the roller, and in order to allow the rollers between the components to circulate continuously and relieve stress, many improved designs install a retainer on the roller; However, different roller cage designs have their own drawbacks. Therefore, how to develop and improve more competitive products for the roller retainer has naturally become the focus of the industry.

Referring to Figure 1, it is a perspective view of the roller screw. It can be seen from the figure that when the roller (3) is arranged in the rolling groove (11, 21) of the screw (1) and the nut (2), Each of the rollers (3) is arranged obliquely so that the ends of the rollers (3) are in contact with each other (as indicated by the symbol X of the component), and when the roller screw is operated, the roller (3) is caused. The friction between the roller and the roller (3) causes the surface of the roller (3) to peel off, and the jamming phenomenon causes the roller screw to be inoperable.

In order to solve the aforementioned problems, another internal circulation roller screw has appeared on the market. Referring to U.S. Patent No. 6,565,632, which is shown in Fig. 2 and Fig. 3, a retainer (16) is placed diagonally opposite the roller (15) and the retainer (16) is positioned at the screw (17). In the toothed track with the nut (not shown), friction is generated by the holder (16) without interference between the roller (15) and the roller (15); this improved technique seems to have been solved. The past problem, but this technology still has another problem as follows: First, since the roller is fixed by a single diagonal, the retainer of the roller must be able to keep the two side non-loading surfaces at the same distance. No contact, but when the roller rotates, it will generate a torque force to the retainer, causing the roller to deflect toward the untouched two non-loading surfaces, making the position of the retainer difficult to fix and easy to fall off, and the retainer falling off The problem that the roller screw is stuck; secondly, since the conventional roller is a single diagonal fixed one retainer, the retainer needs a certain thickness and material stress in order to stably fix the roller, so as to avoid the roller easily Fall off, but the retainer is too thick, but it will let the roll The interval between the roller and the roller becomes larger, resulting in a problem that the number of the entire roller is reduced and the load capacity is reduced. Third, the design of the retainer is not easy to assemble, and even after the roller and the retainer are assembled, the screw and the screw are loaded. It is more difficult between the nuts, and the retainer needs to be inserted into the tooth-shaped track. It takes a lot of time for the light to align, so the manufacturing cost of the roller screw is much improved.

Based on the problems of the above-mentioned conventional techniques, the inventors of the present invention have succeeded in research and development, and the inventions which can achieve the object of the following inventions are finally born.

That is, the primary object of the present invention is to develop a spacer which is easy to assemble and which can increase the load capacity of the roller screw and which can avoid interference between the rollers.

For the above purposes, the present invention is a roller screw with a spacer The invention comprises: a screw extending in a direction into a strip-like structure, and a spiral rolling groove is arranged on the surface; a nut is sleeved on the screw, and a rolling groove is formed on the rolling groove, the rolling The groove and the rolling groove are all V-shaped, and the rolling groove and the rolling groove form a load path; a reflow member is disposed on the nut and has a return flow, the return flow system and the load The path is connected; the plurality of rollers are disposed on the load path and the return channel, and the axes of the rollers are arranged in the same direction, and each of the rollers has an outer diameter surface, and the outer diameter surface is coupled to the rolling groove And the rolling groove contact; the plurality of spacers are disposed between the rollers, the spacer has a holding recess, the retaining recess is for receiving the roller, and the retaining recess has an upright surface and two oblique faces The erect surface is located between the two oblique faces, and the erect surface and the two oblique faces each have an angle, and the oblique direction is inclined toward the end surface of the roller; wherein the roller When the column is in the load path, the outer diameter surface of the roller and one of the oblique faces Contacting; when the roller is on the return path, the outer diameter surface of the roller is in contact with the vertical surface.

In order to further understand the features and technical aspects of the present invention, reference should be made to the description of the embodiments of the present invention and the accompanying drawings. .

Conventional technology

1, 17‧‧‧ screw

11, 21‧‧ ‧ rolling groove

2‧‧‧ nuts

3, 15‧‧‧ Roller

X‧‧‧Contacts

16‧‧‧keeper

this invention

1‧‧‧ screw

11‧‧‧ rolling groove

2‧‧‧ nuts

21‧‧‧ rolling trough

3‧‧‧Return parts

31‧‧‧Return

4, 4A, 4B‧‧‧ Roller

5‧‧‧ spacer

51‧‧‧ Keep the recess

511‧‧‧Upright

512‧‧‧ diagonal plane

52‧‧‧ end face

53‧‧‧ side

6‧‧‧Flipping components

61‧‧‧Flip Road

H‧‧‧ gap

90‧‧‧Load path

T, Y‧‧‧ axis direction

41‧‧‧outer surface

Figure 1 is a perspective view of a conventional technology roller screw.

Figure 2 is a perspective view of a conventionally provided roller with a retainer on a screw.

Figure 3 is an exploded view of a conventional technique holder and roller.

Figures 4A through C are flow diagrams illustrating the design concept of the spacer of the present invention.

Figure 5 is a perspective view of the spacer of the present invention.

Figure 6 is a perspective view of a roller screw having a spacer according to the present invention.

Figure 7 is a cross-sectional view taken along line A-A of Figure 6.

Figure 8 is a view showing the arrangement of the roller and the spacer by removing the nut from the roller screw having the spacer of the present invention.

Figure 9 is a cross-sectional view taken along line B-B of Figure 6.

Figure 10 is a perspective view of the end of a roller screw having a spacer of the present invention.

Figure 11 is a diagram showing the relationship between the spacer and the roller in the return channel of the present invention.

Figure 12 is a diagram showing the relationship between the spacer and the roller in the load path of the present invention.

A preferred embodiment will be further described below in conjunction with the drawings to further illustrate the components and functions of the present invention. The brief description of each drawing is as follows:

Figures 4A through C are flow diagrams illustrating the design concept of the spacer of the present invention.

Figure 5 is a perspective view of the spacer of the present invention.

Figure 6 is a perspective view of a roller screw having a spacer according to the present invention.

Figure 7 is a cross-sectional view taken along line A-A of Figure 6.

Figure 8 is a cross-sectional view taken along line B-B of Figure 6.

Figure 9 is a view showing the arrangement of the roller and the spacer by removing the nut from the roller screw having the spacer of the present invention.

Figure 10 is a perspective view of the end of a roller screw having a spacer of the present invention.

Figure 11 is a diagram showing the relationship between the spacer and the roller in the return channel of the present invention.

Figure 12 is a diagram showing the relationship between the spacer and the roller in the load path of the present invention.

Referring to FIG. 4A to FIG. C, it is a flow chart of the design of the spacer of the present invention. There are two types of roller arrangements in the conventional roller screw, one of which is: the axis of two adjacent rollers Arranged in the same direction, the second is that the axes of the two adjacent rollers are arranged in different directions, and the angle between the two axes is 90 degrees. This arrangement is shown in Figure 4A. The spacer (5) configuration of the present invention is derived from a roller screw in which the axes of two adjacent rollers are arranged in different directions, because the rollers are arranged in different directions, and the rollers are not arranged between the rollers. Mutual interference does not cause problems as mentioned in the prior art, so the roller can be operated at a higher speed to improve the efficiency of operation, and there is no problem of wear, but the cross roller screw The application is not large, and the reasons are as follows.

Rollers with cross-arranged roller screws have the same load on both sides in the axial direction. For equipment that requires only one axial load and no load in the other direction (for example, the clamping mechanism of the injection molding machine) ), and most of the machines that require high loads have this characteristic, so the bread screw application with the same load capacity in the two-axis direction is not large, and the roller screws for the cross-arranged roller screws need to increase the nut. The length is such that one of the unidirectional load capacities meets the requirements of the equipment, but the load capacity in the other direction is wasted, and the length of the nut in the axial direction is also increased; therefore, in order not to waste the load capacity in the other direction, The roller is solved by the roller screws arranged in the same direction. Since the load capacity in one axial direction is greater than the load capacity in the other axial direction, the length of the nut can be shortened and the effective stroke of the roller screw can be increased.

Therefore, the spacer of the present invention is designed for the roller screws in which the rollers are arranged in the same direction, so that the smoothness of the operation is improved to improve the industrial utilization rate, and the detailed design concept is as follows:

Please refer to Figure 4A, such as directly applying the concept of crossed rollers to the same row. In the column screw of the column, the spacer (5) is a cylinder, and its larger volume causes the distance between the two rollers (4) to be enlarged, so that the number of rollers (4) that can be set by the roller screw can be set. The reduction, the relative loss of the load capacity of the roller screw, but the main point of the roller screw is high load, and this design reverses the load of the roller screw, so it is not feasible. Furthermore, referring to FIG. 4B and FIG. 5, in order to reduce the gap between the two rollers (4), the position of the surface where the spacer (5) of the cylinder contacts the roller (4) is cut. A holding recess (51) is formed, and the holding recess (51) has an upright surface (511) which is in contact with the two rollers (4) and the roller (4) is in a straight line. It is feasible to hold the roller (4) with the upright surface (511) in the path because the two rollers (4) are parallel to each other in the straight path, but the present invention takes into account that the roller (4) is in a helical load path. Tilting at an angle (the roller will be tilted at an angle to set the inevitable phenomenon, because of the spiral relationship), and the ends of the two rollers (4) interfere (see Figure 1), so if The spacer of the configuration of the four B (5) holds the roller (4) in the load path, which is bound to prevent the roller (4) from being tilted at an angle, and the distance between the rollers (4) is enlarged. Relatively lost in the spacer (5) means to maintain the recess (51), so in order to allow the roller (4) to be tilted at an angle in the load path, and does not widen between the two rollers (4) Distance, therefore, According to the present invention, as shown in FIG. 4C and FIG. 5, the present invention is further provided on both sides of the holding recess (51) with an oblique angle with the upright surface (511) and an angle with the vertical surface (511). The face (512), the angled face (512) can absorb the angle of inclination of the roller (4) in the load path, and does not enlarge the distance between the rollers (4); in addition, the spacer The shape of the spacer of the cylinder is also preserved, and the side surface (53) is an arc-shaped configuration, and the end surface (52) is a plane, so that the spacer can be prevented from interfering with the running path, so the present invention fully considers Roller and straight path and spiral path settings Type to design a spacer that truly meets the needs of the roller screws in the same direction.

Next, please refer to FIG. 6 to FIG. 12, which is a description of the state in which the spacer of the present invention is actually used for the roller screw:

The roller screw with spacers of the present invention comprises: a screw (1) extending in a direction into an elongated structure, and having a spiral rolling groove (11) on the surface; a nut (2), The sleeve is disposed on the screw (1), and is provided with a rolling groove (21) opposite to the rolling groove (11). The rolling groove (11) and the rolling groove (21) are all V-shaped in cross section, and the The rolling groove (11) and the rolling groove (21) constitute a load path (90); a reflow member (3) is disposed on the nut (2) and has a return passage (31), the return passage ( 31) is coupled to the load path (90) to form a circulation path; a flip element (6) is disposed on the nut (2) and has a flip path (61), the flip path (61) is connected In the load path (90) of the circulation path, to constitute a running path; the plurality of rollers (4) are disposed in the running path, and one end of the turning track (61) to one end of the return channel (31) The axes of the rollers (4A) in the load path (90) are arranged in the same direction, and from the other end of the inversion track (61) to the load path (90) at the other end of the return channel (31). The axes of the rollers (4B) are arranged in the same direction, so the rollers There are two sets of rollers (4A, 4B) arranged in different directions in the rod, which mainly makes the load in the two axial directions (T, Y) different, and the roller screw can be applied to the load in one axial direction and the other axial direction. For equipment that does not need to bear too much load, the load in the axial direction T shown by the component symbol in Figure 8 is greater than the load in the axial direction Y, and the magnitude of the load capacity is determined by the number of rollers. Each of the rollers (4) has an outer diameter surface (41) that is in contact with the rolling groove (11) and the rolling groove (21); a plurality of spacers (5) disposed between each of the rollers (4), the spacer (5) having a holding recess (51) for receiving the roller (4), And the holding recess (51) has an upright surface (511) and two oblique surfaces (512), the upright surface (511) is located between the two oblique surfaces (512), and the vertical surface (511) and The two inclined faces (512) each have an included angle, and the oblique direction (512) is inclined toward the end surface of the roller (4); wherein the roller (4) is in the load path (90) As shown in FIG. 10 and FIG. 12, the outer diameter surface (41) of the roller (4) is in contact with one of the oblique surfaces (512), so the roller (4) can be tilted at an angle. And the end between the two rollers (4) has a gap (H) without interference, so that the running speed of the roller (4) can be increased, and the smoothness is relatively improved; the roller (4) In the return passage (31), as shown in FIG. 9 and FIG. 10, the outer diameter surface (41) of the roller (4) is in contact with the vertical surface (511) because the return passage (31) is mostly A straight path, each roller (4) runs in a parallel manner, so the retention by the upright surface (511) is optimal. Ensure the parallelism between the two rollers (4) without causing the roller (4) to tilt, causing the roller (4) to interfere with the return channel (31); in addition, the spacer The side surface (53) is an arc-shaped configuration, the end surface (52) is a flat surface, and the side surface (53) and the end surface (52) are disposed opposite to the rolling groove (11) and the rolling groove (21), so the spacer (5) Avoid large-area interference with the rolling groove (11) and the rolling groove (21) by the configuration of the side surface (53) in an arc shape during operation; and the end surface (52) is designed by a plane The spacer (5) has a spacing from the rolling groove (11) and the rolling groove (21) so that the spacer (5) does not interfere when operating in the load path (90), and the end face and the side in this embodiment The design is optimal and can of course be of different configurations.

In order to clearly illustrate the implementation features of the present invention, the following description of the present invention is more useful. Steps and practical methods:

1. The present invention has improved the assembly method of the prior art. The spacer of the present invention is an independent individual. When assembling, the roller can be installed in the load path and then a spacer is installed, so the assembly is very easy and can be greatly improved. Reduce assembly time. Moreover, the spacer of the present invention does not need to process any structure in the load path, so that the processing cost of the roller screw can be saved, and the assembly is also easier.

2. The spacer of the present invention can effectively avoid the interference of the ends of the two rollers, and design the surface (the upright surface and the oblique plane) for the roller to bear against the straight path (referring to the return path) and the spiral path (refer to the load path). ), allowing the roller to run smoothly on the load path, return path and flip path.

3. The spacer of the present invention minimizes the spacing between the two rollers to increase the number of rollers that can be accommodated by the load path, thereby increasing the overall load capacity of the roller screw.

In view of the above, the "industrial availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. The use of not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention are in compliance with the patent regulations, and the application for the invention patent is filed 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 be illustrative of the invention and is not intended to limit the scope of the invention.

5‧‧‧ spacer

51‧‧‧ Keep the recess

511‧‧‧Upright

512‧‧‧ diagonal plane

52‧‧‧ end face

53‧‧‧ side

Claims (3)

A roller screw with a spacer comprises: a screw extending in a direction into a strip-like structure, and a spiral rolling groove is arranged on the surface; a nut is sleeved on the screw and provided The rolling groove and the rolling groove have a V-shaped cross section, and the rolling groove and the rolling groove form a load path; a reflow member is disposed on the nut and has a a return path, the return path is connected to form a circulation path; a plurality of rollers are disposed on the circulation path, each of the rollers has an outer diameter surface, and the outer diameter surface is in contact with the rolling groove and the rolling groove a plurality of spacers disposed between each of the rollers, the spacer having a retaining recess for receiving the roller, and the retaining recess having an upright surface and two oblique faces, the upright Between the two inclined faces, the upright surface and the two inclined faces each have an angle, and the oblique direction is inclined toward the end surface of the roller; wherein the roller is in the load path When the outer diameter surface of the roller is in contact with one of the oblique faces When the roller is on the return passage, the outer diameter surface of the roller is in contact with the vertical surface; wherein the spacer has two side surfaces and two end surfaces, and the side surface has an arc-shaped configuration. The end faces are in a planar configuration. The roller screw with a spacer according to claim 1, further comprising: a flipping member disposed on the nut and having a flipping track; the flipping track is coupled to the roller screw The load path of the loop path constitutes a run path. The roller screw with a spacer according to claim 2, wherein the roller is disposed in the running path, and the axis of each roller in the load path from one end of the turning path to one end of the return channel The cores are arranged in the same direction; the axes of the rollers in the load path from the other end of the inversion path to the other end of the return channel are arranged in the same direction.