TWM563496U - Nut assembly for ball screw - Google Patents

Abstract

The present invention relates to a nut assembly for a ball screw, comprising a nut and a dustproof member, the nut has a guiding groove, the dustproof member has an annular body and a engaging protrusion, and the engaging convex portion The block is connected to the outer annular surface of the annular body and has a first guiding curved surface, a second guiding curved surface, a guiding plane and a guiding inclined surface, and the arc of the first guiding curved surface is equal to the annular body The arc of the outer ring surface, one end of the second guiding arc surface is tangent to the outer ring surface of the annular body, and the other end of the second guiding arc surface is connected to the first guiding arc surface, and the guiding plane is parallel to the annular body The inner and outer end faces extend from the one end of the guiding plane. Thereby, the dustproof component provided by the present invention can be directly screwed into the nut through the guiding groove of the nut to increase the assembly convenience.

Description

Nut assembly for a ball screw

This creation relates to a ball screw, and in particular to a nut assembly for a ball screw.

During the use of the ball screw, in order to prevent the scum or other foreign matter from entering the inside of the nut from the gap between the screw and the nut, the ball is usually affected, and a dustproof member is usually installed at both ends of the nut. It is used to block the invasion of foreign objects and prevent the loss of internal lubricating fluid, so that the nut can maintain good smoothness.

In the prior art, the dustproof member disclosed in the Republic of China Publication No. I435987 forms a positioning protrusion and a pair of dent portions on the outer edge thereof, and the nut is fitted with the positioning protrusion and the dent portion on the end surface, respectively. Forming a positioning groove and a pair of tooth recesses, by the combination of the positioning protrusion and the positioning groove and the combination of the tooth protrusion and the tooth recess, the relative position of the dustproof element can be restricted after being assembled to the nut. However, in the above-mentioned conventional patent case, the nut needs to be taken out of the screw or retracted to the end of the screw to perform the disassembly and assembly of the dustproof member, so that in some cases, the difficulty of assembly is increased, for example, the length of the screw is long. , the screw does not have a single side, a serial nut or a heavy duty nut.

The main object of the present invention is to provide a nut assembly for a ball screw that can increase assembly convenience.

In order to achieve the above main object, the nut assembly of the present invention comprises a nut and a dustproof member. The screw hole has a screw hole extending through the opposite end faces, and one end of the nut has a mounting groove axially communicating with the screw hole, and an engaging groove axially communicating with the shaft hole and adjacent to the mounting groove a positioning groove radially communicating with the mounting groove and a guiding groove radially communicating with the mounting groove; the dustproof member has an annular body, a positioning protrusion and a locking protrusion, the ring The body is disposed in the mounting groove of the nut and has a first dustproof surface facing the nut, a second dustproof surface facing the nut, and a periphery other than the first and second dustproof surfaces. a ring surface and an inner ring surface connecting the inner circumferences of the first and second dust-proof surfaces, the positioning protrusions are integrally connected to the outer ring surface of the annular body and are engaged with the positioning grooves of the nut, The engaging protrusion is integrally connected to the outer ring surface of the annular body and is engaged with the engaging groove of the nut. The engaging protrusion has a first guiding portion and a second guiding portion. The first guiding portion has a first guiding curved surface and a guiding plane, and the first guiding portion The curvature of the curved surface is equal to the curvature of the outer annular surface of the annular body, and the guiding plane is between the first and second dustproof surfaces of the annular body and parallel to the first and second dustproof of the annular body The second guiding portion has a second guiding curved surface and a guiding inclined surface, and one end of the second guiding curved surface is tangent to the outer annular surface of the annular body, and the second guiding curved surface The other end is connected to the first guiding curved surface of the first guiding portion, and the guiding inclined surface extends from one end of the guiding plane of the first guiding portion toward the first dustproof surface of the annular body.

It can be seen from the above that the nut assembly of the present invention uses the guiding groove of the nut as the entrance of the second guiding portion of the engaging projection of the dustproof member, and transmits the second guiding portion of the engaging projection. The special structural design enables the dustproof component to be screwed directly into the nut, and the nut does not need to be withdrawn from the screw provided by the nut or retracted to the end of the screw, thereby increasing assembly convenience. .

More preferably, the nut has two guiding grooves, the two guiding grooves are rotationally symmetric about the axis of the nut, and the dustproof member has two engaging protrusions, and the two engaging protrusions The center of the ring body is rotationally symmetrical about the center, so that the dustproof member has a better fixing effect.

More preferably, the groove wall of the guiding groove of the nut has an arc segment and a straight extending portion, one end of the arc segment is connected to the groove wall of the mounting groove, and the other end of the curved segment is connected to the straight extending portion The other end of the straight extending section is tangent to the groove wall of the mounting groove, so that the guiding groove can further provide a good guiding effect on the engaging protrusion of the dustproof component.

The detailed construction, features, assembly or use of the nut assembly provided by this creation will be described in the detailed description of the subsequent embodiments. However, those of ordinary skill in the art should understand that the detailed description and specific embodiments of the present invention are merely used to illustrate the present invention and are not intended to limit the scope of the patent application.

The Applicant first describes the same or similar elements or structural features thereof in the embodiments and the drawings which will be described below.

Referring first to Figures 1 and 5, the ball screw 10 shown therein includes a screw 12, a nut assembly 16, and a plurality of balls 18. Referring to FIG. 2 again, the nut assembly 16 of the present invention includes a nut 20 and a dustproof member 30.

The nut 20 has a screw hole 21 extending through the opposite end faces, and the nut 20 is disposed on the screw 12 through the screw hole 21. As shown in FIGS. 2 and 5, one end of the nut 20 has a mounting groove 22 axially communicating with the screw hole 21, an axial communication screw hole 21, and an engaging groove 23 adjacent to the mounting groove 22, The positioning groove 24 radially communicating with the mounting groove 22 and the two guiding grooves 25 radially communicating with the mounting groove 22, wherein the guiding groove 25 has an arc segment 26 and a straight extending portion 27, as shown in FIG. As shown, one end of the curved section 26 is connected to the groove wall of the mounting groove 22, and the other end of the curved section 26 is connected to one end of the straight extending section 27, and the other end of the straight extending section 27 is tangent to the groove wall of the mounting groove 22.

The dustproof member 30 has an annular body 40, a lip portion 45, a positioning projection 46 and two engaging projections 47, wherein:

The annular body 40 has a first dust-proof surface 41, a second dust-proof surface 42 facing the first dust-proof surface 41, a ring surface 43 connected to the outer periphery of the first and second dust-proof surfaces 41, 42 and a connection. The inner circumferential surface 44 of the inner circumference of the first and second dustproof surfaces 41, 42.

The lip 45 is integrally connected to the inner annulus 44 of the annular body 40.

The positioning projection 46 is integrally connected to the outer annular surface 43 of the annular body 40.

The two engaging projections 47 are integrally connected to the outer annular surface 43 of the annular body 40 and are rotationally symmetric about the center of the annular body 40. Each of the engaging projections 47 has a first guiding portion 48 and a second guiding portion 49, wherein the first guiding portion 48 has a first guiding curved surface 482 and a guiding plane 484, as shown in Figures 3 and 4, the curvature of the first guiding curved surface 482 Equal to the curvature of the outer annular surface 43 of the annular body 40, the guiding plane 484 is interposed between the first and second dustproof surfaces 42 of the annular body 40 and parallel to the first and second dustproof surfaces 41 of the annular body 40. 42. The second guiding portion 49 has a second guiding curved surface 492 and a guiding inclined surface 494. As shown in FIGS. 3 and 4, one end of the second guiding curved surface 492 is tangent to the annular body. The outer ring surface 43 and the other end of the second guiding curved surface 492 are connected to the first guiding curved surface 482 of the first guiding portion 48. The guiding inclined surface 494 is guided from the guiding plane 484 of the first guiding portion 48. One end extends toward the first dust-proof surface 41 of the annular body 40. More specifically, the highest point of the guiding slope 494 is connected to one end of the guiding plane 484 of the first guiding portion 48, and the guiding surface 494 is guided. Low dust attached to the surface of the first annular body 40 of the junction 41 and the outer surface 43.

When assembling, the annular body 40 of the dustproof member 30 is sleeved on the screw 12, so that the first dustproof surface 41 of the annular body 40 faces the nut 20, and the second dustproof surface 42 of the annular body 40 is backed. The nut 20 is then rotated by the dustproof member 30 to adjust the position relative to the nut 20. When the lowest point of the second guiding portion 49 of the engaging projection 47 is aligned with the guiding groove 25 of the nut 20, the dustproof member 30 is Pressing and pressing, a part of the second guiding portion 49 of the engaging projection 47 is snapped into the engaging groove 23 of the nut 20, and the second guiding arc by the second guiding portion 49 is at this time. The design of the face 492 and the guide ramp 494 allows the dustproof member 30 to be easily screwed into the nut 20 for assembly. After the assembly is completed, as shown in FIGS. 1 and 5, the annular body 40 of the dustproof member 30 is engaged in the mounting groove 22 of the nut 20, and the lip portion 45 of the dustproof member 30 is engaged with the threaded groove 14 of the screw 12. The positioning protrusions 46 of the dustproof member 30 are engaged in the positioning recesses 24 of the nut 20, and the engaging projections 47 of the dustproof member 30 are engaged in the engaging recesses 23 of the nut 20.

As can be seen from the above, the nut assembly 16 of the present invention utilizes the guide groove 25 of the nut 20 as the entrance of the second guiding portion 49 of the engaging projection 47 of the dustproof member 30, and utilizes the engaging projection 47. The second guiding curved surface 492 and the guiding inclined surface 494 of the two guiding portions 49 are designed such that the dustproof member 30 can be directly screwed into the nut 20 even if the screw 12 is of a type that has a long length or no teeth. When the dustproof member 30 is assembled, it is no longer necessary to take the nut 20 out of the screw 12 or to the end of the screw 12, thereby achieving the purpose of increasing assembly convenience.

10‧‧‧Rolling screw
12‧‧‧ screw
14‧‧‧Thread groove
16‧‧‧ nut assembly
18‧‧‧ balls
20‧‧‧ nuts
21‧‧‧ screw holes
22‧‧‧Installation slot
23‧‧‧Snap groove
24‧‧‧ positioning groove
25‧‧‧ guiding slot
26‧‧‧Arc segments
27‧‧‧ straight stretch
30‧‧‧Dustproof components
40‧‧‧Circular body
41‧‧‧First dust-proof surface
42‧‧‧Second dust-proof surface
43‧‧‧ outer annulus
44‧‧‧ Inner torus
45‧‧‧Lip
46‧‧‧ positioning bumps
47‧‧‧Clamping bumps
48‧‧‧First Guidance
482‧‧‧First guiding curved surface
484‧‧‧ guiding plane
49‧‧‧Second guidance
492‧‧‧Second guiding curved surface
494‧‧‧ Guided slope

Fig. 1 is a perspective view showing the appearance of a ball screw to which the nut assembly of the present invention is applied. Figure 2 is an exploded perspective view of the nut assembly of the present invention. Figure 3 is an end view of the dust-proof element provided by the nut assembly of the present invention. Figure 4 is a side view of the dustproof element provided by the nut assembly of the present invention. Figure 5 is a partial cross-sectional view of the ball screw of the nut assembly of the present application.

Claims (4)

A nut assembly for a ball screw, comprising: a nut having a screw hole extending through two opposite end faces, one end of the nut having a mounting groove axially communicating with the screw hole, and an axial communication The screw hole is adjacent to the engaging groove of the mounting groove, a positioning groove radially communicating with the mounting groove, and a guiding groove radially communicating with the mounting groove; and a dustproof member having a ring The annular body is disposed in the mounting groove of the nut and has a first dustproof surface facing the nut and a second dustproof member facing the nut a surface, an annular surface connecting the outer periphery of the first and second dust-proof surfaces, and an inner annular surface connecting the inner circumferences of the first and second dust-proof surfaces, the positioning protrusion being integrally connected to the annular body The outer ring surface is engaged with the positioning groove of the nut, and the engaging protrusion is integrally connected to the outer ring surface of the annular body and is engaged with the engaging groove of the nut, the engaging convex portion The block has a first guiding portion and a second guiding portion, the first guiding portion has a first guiding curved surface and a guiding a curvature of the first guiding arc surface equal to an arc of the outer annular surface of the annular body, the guiding plane being interposed between the first and second dustproof surfaces of the annular body and parallel to the annular body The first and second dust-proof surfaces, the second guiding portion has a second guiding curved surface and a guiding inclined surface, and one end of the second guiding curved surface is tangent to the outer annular surface of the annular body, The other end of the second guiding curved surface is connected to the first guiding curved surface of the first guiding portion, and the guiding inclined surface is from the end of the guiding plane of the first guiding portion toward the first of the annular body The direction of the dust-proof surface extends. The nut assembly for a ball screw according to claim 1, wherein the nut has two guiding grooves, the two guiding grooves are rotationally symmetric about an axis of the nut, and the dustproof member has The engaging protrusions are rotationally symmetric about a center of the annular body. The nut assembly for a ball screw according to claim 1 or 2, wherein the groove wall of the guiding groove of the nut has an arc segment and a straight extending portion, and one end of the arc segment is connected to the mounting groove The other end of the curved section is connected to one end of the straight section, and the other end of the straight section is tangent to the groove wall of the mounting groove. A nut assembly for a ball screw according to claim 1, wherein the dustproof member further has a lip integrally connected to the inner annular surface of the annular body.