KR20210001230U - Ball screw - Google Patents

Abstract

The present invention relates to a ball screw, comprising one screw shaft, one nut movably installed on the screw shaft, and a plurality of balls installed between the screw shaft and the nut, wherein the nut is provided with a single return passage, , One return cover is installed on the outer circumferential surface of the nut, the return cover is provided with one first return groove, one end cover is installed on one end surface of the nut, and the end cover has one second return groove and the return passage of the nut, the first return groove of the return cover, and the second return groove of the end cover are connected to each other to form a single return path for the ball to travel. In this way, the ball screw of the present invention is applied to high lead, multi-thread, and can thread the other cross-section of the nut without increasing the nut length and outer diameter, thus meeting the customized needs.

Description

ball screw {BALL SCREW}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a ball screw, and more particularly to a ball screw using two different return elements.

According to the return method, the ball screw can be broadly classified into three types: an external circulation type, an internal circulation type, and an end plug (end cover) type. The external circulation type installs the return element on the outer peripheral surface of the nut and provides a return effect to the ball using the return groove of the return element, so the applicable lead range is wide. Because it circulates inside the nut, it is suitable for use in the condition of a nut with a relatively normal lead and a small volume. The end plug (end cover) type installs two end covers at the two ends of the nut, and one for the nut. of the axial through-hole, so that the ball completes the return circulation by the return groove of the two end covers and the axial through-hole of the nut, so it can be suitable for use in conditions of short high lead and nut length .

As shown in Taiwan Patent No. M531532, the conventional ball screw uses an external circulation cover and an end plug at the same time, and the patent is limited by the size of the end plug and nut, and only the maximum double thread design is possible, Construction of triple thread, quad thread or more threads is not possible.

Due to custom requirements, sometimes the nut must be specially machined (such as threaded on one end of the nut) to be used with other components, but when threaded, the length of the nut is increased due to the limitations of conventional return methods. The outer diameter can be large, which can also affect the lead accuracy of the nut. Therefore, special machining of the nut without increasing the length and outer diameter of the nut is a problem to be solved at present.

The main object of the present invention is to provide a ball screw capable of achieving the high-lead, multi-thread requirement without increasing the length and outer diameter.

In order to achieve the above-mentioned main object, the ball screw of the present invention includes one screw shaft, one nut, one return cover, one end cover, and a plurality of balls. The nut moves along an axial direction of the screw shaft, the nut and the screw shaft jointly form a single load path, and an outer circumferential surface of the nut is provided with a bearing part, and the bearing part is connected to the load path and the load path. A guide groove communicating with each other is provided, the nut has a single return passage, the return passage extends from one end surface of the nut to the bearing portion along the axial direction of the screw shaft, and the return cover includes the nut is installed in the bearing part of the nut and the return cover is provided with a first return groove, two ends of the first return groove are respectively connected to the guide groove of the nut and the return passage of the nut, and the end cover of the nut installed on the end face, the end cover is provided with a second return groove, one end of the second return groove is connected to the load path, and the other end of the second return groove is connected to the return passage of the nut; The second return groove, the return passage, the first return groove, and the guide groove jointly form a single return path, and the return path and the load path are one circulation for the plurality of balls to travel. jointly form a path.

As can be seen from the above bar, the ball screw of the present invention uses a single circulation path formed through the combination of the return cover and the end cover, without increasing the length and outer diameter of the nut, high lead, multiple threads to enable you to achieve your needs.

Preferably, the nut is provided with one male thread part, and the external thread part protrudes along the axial direction of the screw shaft from the other end surface of the nut, and the external thread can be machined without increasing the length and outer diameter of the nut. to meet your custom needs.

Preferably, the bearing portion of the nut is provided with one tangent plane and one elevation, the guide groove extends from the tangent plane to the female thread groove of the nut, and the elevation is vertically connected to one end of the tangent plane. is provided with a positioning concave groove, the return passage extends to the elevation, the return cover abuts against the tangent plane, and one positioning projection is provided, and the return cover is positioned at the position by the positioning projection. It is inserted and installed inside the crystal concave groove, increasing the convenience of assembly.

Preferably, a cross-sectional area of the first return groove of the return cover is greater than a cross-sectional area of the return passage of the nut to facilitate movement of the plurality of balls.

Preferably, the outer circumferential surface of the nut is provided with a plurality of the bearing portions, each of the bearing portions is provided with the return cover, the nut is provided with a plurality of the return passages, and each of the return passages includes the bearing portion. Corresponding to, a side surface of the end cover facing the nut is provided with a plurality of second return grooves, and one end of each of the second return grooves is connected to the return passage of the nut, and as such, the end cover And by the combination of the return cover, it is possible to realize the design of multiple threads.

With respect to the detailed structure, characteristics, assembly or use method of the ball screw provided in the present invention, it will be described in the detailed description of the following embodiments. However, for those of ordinary skill in the art, the above detailed description and specific embodiments exemplified for carrying out the present invention are only for explaining the present invention, and for limiting the claims of the present invention You will understand that it is not

1 is a perspective view of a ball screw of the present invention.
Figure 2 is an exploded perspective view of the ball screw of the present invention.
3 is a plan view of the ball screw of the present invention.
4 is a longitudinal cross-sectional view of the ball screw of the present invention.
FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 3 .
6 is a partial cross-sectional view of the ball screw of the present invention.

First, in the entire description including the claims of the embodiments and utility model to be described below, all nouns related to direction are based on the direction in the drawings. Second, in the embodiments and drawings to be described below, the same element reference numerals mean the same or similar elements or structural features thereof.

1 and 2, the ball screw 10 of the present invention has one screw shaft 20, one nut 30, four return covers 40, one end cover 50, and a plurality of of balls 60 (the number is not limited).

One male thread groove 22 is provided on the outer peripheral surface of the screw shaft 20 .

The nut 30 is provided with one first end face 31, one second end face 32, and one screw hole 33 penetrating the first end face 31 and the second end face 32, The nut 30 is fitted to the screw shaft 20 by the screw hole 33 to move along the axial direction of the screw shaft 20 . As shown in FIG. 4 , a single female threaded groove 34 is provided on the wall surface of the screw hole 33 , and the female threaded groove 34 of the nut 30 is a male threaded groove 22 of the screw shaft 20 and Correspondingly, one load path 61 is jointly formed with each other. In addition, the outer circumferential surface of the nut 30 is provided with four bearing parts 35, the four bearing parts 35 are arranged in a ring shape at equal intervals around the screw hole 33, and each bearing part ( 35) is provided with one tangent plane 352 and one elevation 354 vertically connected to the tangent plane 352, and the tangent plane 352 is extended inward to communicate with the female threaded groove 34. One guide groove 36 (as shown in FIGS. 2 and 5) is provided, and the elevation 354 is provided with two positioning concave grooves 37 (actually one or more may be sufficient). In addition, the nut 30 is provided with a single ring-shaped male screw portion 38, and the male screw portion 38 protrudes from the first end face 31 in the axial direction of the screw shaft 20, and is shown in FIG. As shown in , four return passages 39 are provided inside the nut 30 , and each return passage 39 corresponds to one bearing part 35 , and each return passage 39 . extends from the second end face 32 to the elevation 354 of the bearing portion 35 along the axial direction of the screw shaft 20 .

The four return covers 40 correspond to the four bearing portions 35 of the nut 30 in a one-to-one manner. Each return cover 40 is fixed to the bearing portion 35 of the nut 30 by a single screw 44 , and each return cover 40 is provided with one bearing surface 41 , each of the return cover 40 is in close contact with the tangent plane 352 of the bearing part 35 of the nut 30 by the bearing surface 41, and one end of each return cover 40 has two positioning protrusions 42 ) (actually only one) is provided, and each return cover 40 has one end in contact with the elevation 354 of the bearing part 35 of the nut 30 and is formed by two positioning protrusions 42 . The nut 30 is inserted and installed in the positioning concave groove 37 of the bearing part 35 (as shown in FIG. 3 ). In addition, the bearing surface 41 of each return cover 40 is provided with one first return groove 43 , and as shown in FIG. 6 , one end of the first return groove 43 is a nut 30 . ) is connected to the return passage 39 , and the other end of the first return groove 43 is connected to the guide groove 36 of the nut 30 . In addition, the cross-sectional area of the first return groove 43 of the return cover 40 is larger than the cross-sectional area of the return passage 39 of the nut 30 . Here, the number of the return cover 40 and the bearing part 35 is not limited to four, and various numbers of parts may be designed according to actual needs.

The end cover 50 is fixed to the second end face 32 of the nut 30 by means of four screws 53 . A shaft hole 51 through which the screw shaft 20 is installed is provided in the middle of the end cover 50 , and the side of the end cover 50 facing the nut 30 has four second return grooves 52 . It is provided, and the four second return grooves 52 are rotationally symmetric with respect to the shaft hole 51 adjacent to the periphery of the shaft hole 51 . 4 and 6 , one end of the second return groove 52 is connected to the return passage 39 of the nut 30 , and the second return groove 52 of the end cover 50, the nut The return passage 39 of 30, the first return groove 43 of the return cover 40, and the guide groove 36 of the nut 30 jointly form one return path 62, One end of the path 62 is connected to the load path 61 by the guide groove 36 of the nut 30 , and the other end of the return path 62 is in the second return groove 52 of the end cover 50 . By being connected to the load path 61 by the return path 62 and the load path 61 to jointly form a single circulation path for the plurality of balls 60 to travel. In addition, the rotation radius of the second return groove 52 of the end cover 50 is the same as the rotation radius of the first return groove 43 of the return cover 40 .

As can be seen from the above-mentioned bar, the ball screw 10 of the present invention uses a circulation path formed through the combination of two different return elements such as the return cover 40 and the end cover 50, so it is suitable for a high lead. In addition, the design of multiple threads can be realized, and the male thread part 38 can be machined without increasing the length and outer diameter of the nut 30, so as to meet the customized needs.

10 ball screw 20 screw shaft
22 male thread groove 30 nut
31 first section 32 second section
33 screw hole 34 female thread groove
35 Bearing part 352 Tangent plane
354 Elevation 36 Guide groove
37 Positioning concave groove 38 Male thread part
39 Return passage 40 Return cover
41 Bearing surface 42 Positioning projection
43 First return groove 44 Screw
50 end cover 51 shaft hole
52 Second return groove 53 Screw
60 Ball 61 Load Path
62 return path

Claims (8)

It includes a screw shaft, a nut, a return cover, an end cover, and a plurality of balls,
The nut moves along an axial direction of the screw shaft, the nut and the screw shaft jointly form a load path, a bearing part is provided on an outer circumferential surface of the nut, and the bearing part is provided with a guide groove communicating with the load path and the nut is provided with a return passage, and the return passage extends from one end of the nut to the bearing portion along the axial direction of the screw shaft,
The return cover is installed on the bearing part of the nut and provided with a first return groove, and two ends of the first return groove are respectively connected to the guide groove and the return passage,
The end cover is installed on one end surface of the nut, the end cover is provided with a second return groove, and the second return groove, the return passage, the first return groove, and the guide groove jointly share a return path. and the return path and the load path jointly form a circulation path,
The plurality of balls are installed to be rollable inside the circulation path, the ball screw. According to claim 1,
The nut includes a male screw portion protruding from the other end surface of the nut in the axial direction of the screw shaft. According to claim 1,
The bearing portion of the nut is provided with a tangent plane and an elevation vertically connected to the tangent plane, the guide groove extends from the tangent plane to the female thread groove of the nut, and the elevation is provided with a positioning concave groove, the nut of The return passage extends to the elevation, the return cover abuts against the tangent plane, a positioning protrusion is provided, and the positioning protrusion is inserted and installed in the positioning concave groove. According to claim 1,
and a cross-sectional area of the first return groove of the return cover is greater than a cross-sectional area of the return passage of the nut. According to claim 1,
and a radius of rotation of the first return groove of the return cover is the same as a radius of rotation of the second return groove of the end cover. 6. The method according to any one of claims 1 to 5,
An outer circumferential surface of the nut is provided with a plurality of the bearing portions, each of the bearing portions is provided with the return cover, the nut is provided with a plurality of the return passages, and each of the return passages corresponds to the bearing portion, and the The end cover is provided with a plurality of the second return grooves, and one end of each of the second return grooves is connected to the return passage of the nut. 7. The method of claim 6,
The plurality of bearing parts are arranged in a ring shape at equal intervals around the screw hole. 7. The method of claim 6,
The end cover is provided with a shaft hole through which the screw shaft is installed, and the plurality of second return grooves are rotationally symmetrical with respect to the shaft hole.

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