JP3220160U - Ball screw with safety protection function - Google Patents

Abstract

A ball screw with a safety protection function is provided.
A ball screw includes a screw shaft, a nut, a dust-proof ring, a stopper ring, and a fitting ring. The nut has a screw hole 32 that meshes with the screw shaft, and a first annular groove, a second annular groove, and a third annular groove that are formed in order from the inside to the outside of one end. The dust-proof ring is disposed in the first annular groove of the nut. The stopper ring is disposed in the second annular groove of the nut so as to contact the dustproof ring. The fitting ring is disposed in the third annular groove of the nut so as to contact the stopper ring. The outer diameter of the dust-proof ring is smaller than the outer diameter of the stopper ring. The outer diameter of the stopper ring is smaller than the diameter of the third annular groove. Due to the structural features described above, the ball screw improves the shaft strength and prevents the fitting ring from jumping to the outside of the nut with the fitting ring sandwiched by the external force. Can be increased.
[Selection] Figure 2

Description

  The present invention relates to a ball screw, and more particularly to a ball screw that improves safety protection capability.

  The ball screw posted by patent document 1 has the self-lubricating dustproof module arrange | positioned inside the nut. The self-lubricating dustproof module includes a guide ring, a wiper, a solid lubricating member, and a position limiting ring. Since the wiper is closer to the end face of the nut than the guide ring, the self-lubricating dustproof module performs the first dustproof work with the wiper and at the same time the second dustproof work with the guide ring. On the other hand, the guide ring advances the dust-proofing operation and simultaneously distributes the lubricating material on the surface of the screw to moisten the screw, thereby improving the dust-proofing effect and performing a self-lubricating function.

  In Patent Document 1, the position limiting concave portion corresponding to the arrangement of the position limiting ring has a slope. When the ball screw expires, the position limiting ring must endure an excessive load in the axial direction, so that the position limiting ring tends to deviate from the position limiting concave portion. Other parts, such as balls, can jump out of the nut and injure surrounding workers.

Taiwan Utility Model M549283 publication

  The main object of the present invention is to provide a ball screw that improves the shaft bearing strength.

  In order to solve the above-described problem, the ball screw according to the first embodiment of the present invention includes a screw shaft, a nut, a plurality of balls, and a dustproof member. The nut has two opposite ends, a screw hole that passes through the two ends and meshes with the screw shaft, and a first annular groove, a second annular groove, and a third annular groove formed at one end. The first annular groove, the second annular groove, and the third annular groove are formed so as to be arranged in order from the inside to the outside along the axial direction of the screw shaft, and are connected in the radial direction of the screw hole. The plurality of balls are disposed between the screw shaft and the nut in order to achieve a transmission effect. The dustproof member has a dustproof ring, a stopper ring, and a fitting ring. The dust-proof ring is disposed in the first annular groove of the nut. The stopper ring is disposed in the second annular groove of the nut so as to contact the dustproof ring. The fitting ring is disposed in the third annular groove of the nut so as to contact the stopper ring. The outer diameter of the dust-proof ring is smaller than the outer diameter of the stopper ring. The outer diameter of the stopper ring is smaller than the diameter of the third annular groove. The stopper ring deformed by an external force suppresses the fitting ring from jumping to the outside of the nut across the fitting ring, so that the ball screw according to the present invention improves the shaft bearing strength and enhances the safety protection effect during operation. it can.

  In a relatively preferred case, the outer diameter of the stopper ring is smaller than the outer diameter of the fitting ring. The outer diameter of the screw shaft is smaller than the inner diameter of the stopper ring. The inner diameter of the stopper ring is smaller than or equal to the pitch diameter of the ball screw. Due to the structural features described above, the stopper ring can provide the best protective effect.

  In a relatively preferred case, the stopper ring has a thickness between 0.5 mm and 2 mm, and the hardness is less than the hardness of the fitting ring or the nut. Due to the structural features described above, a stopper ring that can withstand axial loads is more likely to deform than a fitting ring or nut.

  The ball screw according to the second embodiment of the present invention employs the same nut as the first embodiment. The difference from the first embodiment is in the dustproof member. In the second embodiment, the dust-proof member has a stopper ring and a plurality of fixing members. The stopper ring is fitted to the screw shaft and has a large annular portion and a small annular portion. The macrocyclic part abuts against the end of the nut. The small annular portion is connected to the large annular portion and is disposed in the second annular groove of the nut to shield the third annular groove of the nut. The plurality of fixing members fix the stopper ring to the nut along the axial direction of the screw shaft. The diameter of the first annular groove is smaller than the outer diameter of the small annular portion of the stopper ring. The outer diameter of the small annular portion of the stopper ring is smaller than the diameter of the third annular groove. Due to the structural features described above, the stopper ring is tightened and fixed along the axial direction, so that the shaft bearing strength can be improved and the safety protection effect can be enhanced.

  When relatively preferable, the dustproof member further includes a dustproof ring. The dust-proof ring is disposed in the first annular groove so as to contact the small annular portion of the stopper ring, and the outer diameter is smaller than the outer diameter of the small annular portion of the stoper ring. The outer diameter of the screw shaft is smaller than the inner diameter of the small ring portion of the stopper ring. The inner diameter of the small annular part of the stopper ring is smaller than or equal to the pitch diameter of the ball screw. Due to the structural features described above, the stopper ring can provide the best protective effect.

  The detailed structure, characteristics, assembly or use of the ball screw according to the present invention will be clarified through the following detailed description of embodiments. Further, the following detailed description and the embodiments presented by the present invention are only examples for explaining the present invention, and it is not common to limit the scope of the present invention. If so, it should be understood.

It is a perspective view which shows the ball screw by 1st Embodiment of this invention. It is a disassembled perspective view which shows a part of ball screw by 1st Embodiment of this invention. It is sectional drawing which shows the ball screw by 1st Embodiment of this invention. FIG. 4 is an enlarged view of a part of FIG. 3. It is a perspective view which shows the ball screw by 2nd Embodiment of this invention. It is a disassembled perspective view which shows a part of ball screw by 2nd Embodiment of this invention. It is sectional drawing which shows the ball screw by 2nd Embodiment of this invention. FIG. 8 is an enlarged view of a part of FIG. 7. It is sectional drawing which shows the ball screw by 3rd Embodiment of this invention.

  Hereinafter, a ball screw according to the present invention will be described with reference to the drawings. The same reference numbers in the figures indicate the structural features of the same or similar parts.

(First embodiment)
As shown in FIGS. 1 to 4, the ball screw 10 according to the first embodiment of the present invention includes a screw shaft 20, a nut 30, a plurality of balls 48, and a pair of dustproof members 50.

  The screw shaft 20 has a screw groove 22 on the outer peripheral surface. The nut 30 has two opposite end portions 31, screw holes 32 penetrating the two end portions 31, four fixing holes 33 formed in each end portion 31, and screw grooves formed in the inner wall surface of the screw hole 32. 34. The nut 30 is engaged with the screw shaft 20 through the screw hole 32, thereby connecting the screw groove 34 of the nut 30 and the screw groove 22 of the screw shaft 20 to form a spiral passage 44.

As shown in FIGS. 3 and 4, the two opposite ends 31 of the nut 30 have a first annular groove 35, a second annular groove 36, and a third annular groove 37, respectively. The first annular groove 35, the second annular groove 36, and the third annular groove 37 are formed so as to be arranged in order from the inside to the outside along the axial direction of the screw shaft 20, and are connected in the radial direction of the screw hole 32.
Two opposing ends 31 of the nut 30 each have a reflux member 40. The reflux member 40 has a first passage 42. The nut 30 further has a second passage 38. Since the first passage 42 is connected to the spiral passage 44 and the second passage 38, the spiral passage 44 is combined with the two first passages 42 and the second passage 38 to form a load passage 46. The plurality of balls 48 are arranged in the load path 46. Since the detailed part of the reflux member 40 is a well-known technique, detailed description is abbreviate | omitted.

Since the two dustproof members 50 are disposed at the two opposite end portions 31 of the nut and have the same structure and symmetry, only one dustproof member 50 will be described below.
As shown in FIGS. 2 and 3, the dustproof member 50 includes a dustproof ring 51, a stopper ring 52 and a fitting ring 53. The dustproof ring 51 is disposed in the first annular groove 35 of the nut 30 in order to achieve a dustproof effect, and contacts the packing ring 54. The stopper ring 52 is disposed in the second annular groove 36 of the nut 30 in order to give the dust-proof ring 51 a stopper effect, and comes into contact with the dust-proof ring 51 to completely shield the reflux member 40. The fitting ring 53 is disposed in the third annular groove 37 of the nut 30 in order to stabilize the stopper ring 52 and contacts the stopper ring 52.
The outer diameter D6 of the stopper ring 52 is larger than the outer diameter D5 of the dust-proof ring 51, and smaller than the diameter D4 of the third annular groove 37 of the nut 30 and the outer diameter D8 of the fitting ring 53 (D4 is equal to D8 in FIG. 3). . Here, in the present embodiment, the diameter of the groove refers to a distance relative to the bottom of the groove around the screw shaft 20.
As shown in FIG. 4, the inner diameter D7 of the stopper ring 52 is larger than the outer diameter D1 of the screw shaft 20 and smaller than or equal to the pitch diameter D2 of the ball screw 10 (D7 is equal to D2 in FIG. 4). The stopper ring 52 has a thickness T between 0.5 mm and 2 mm, and the hardness is smaller than the hardness of the fitting ring 53 or the hardness of the nut 30. Due to the structural features described above, the stopper ring 52 that has received an external force is more likely to be deformed than the fitting ring 53 or the nut 30.

  That is, the entire structure of the stopper ring 52 that can withstand an excessive load in the axial direction is more likely to be deformed than the fitting ring 53 and the nut 30. The stopper ring 52 deformed by an external force can prevent the fitting ring 53 from jumping out of the nut 30 with the fitting ring 53 sandwiched between them based on the dimensional relationship with another component. It is possible to prevent the balls 48 or other parts from coming out of the nut 30 together with the fitting ring 53. In other words, the ball screw 10 according to the present invention can effectively improve the shaft bearing strength and enhance the safety protection effect during operation.

(Second Embodiment)
As shown in FIGS. 5 to 8, the ball screw according to the second embodiment of the present invention employs the same screw shaft 20, nut 30 and ball 48 as those of the first embodiment. The difference from the first embodiment is in the dustproof member 60.

In the second embodiment, the dustproof member 60 includes a stopper ring 61 and four fixing members 65 (that is, the bolts 65 in FIG. 6). The stopper ring 61 is fitted to the screw shaft 20 and has a large annular portion 62, a small annular portion 63 and four perforations 64. The large annular portion 62 abuts on the end 31 of the nut 30. The small annular portion 63 is connected to the large annular portion 62 and is disposed in the second annular groove 36 of the nut 30 to shield the third annular groove 37 of the nut 30. The four perforations 64 penetrate the large annular portion 62 and the small annular portion 63, respectively. Each fixing member 65 passes through the hole 64 of the stopper ring 61 one by one and is fastened to the fixing hole 33 of the nut 30. That is, each fixing member 65 fixes the stopper ring 61 to the nut 30 along the axial direction of the screw shaft 20.
The outer diameter D9 of the small annular portion 63 of the stopper ring 61 is larger than the diameter D3 of the first annular groove 35 of the nut 30 and smaller than the diameter D4 of the third annular groove 37 of the nut 30. As shown in FIG. 8, the inner diameter D10 of the small annular portion 63 of the stopper ring 61 is larger than the outer diameter D1 of the screw shaft 20, and smaller than or equal to the pitch diameter D2 of the ball screw 10 (D10 is equal to D2 in FIG. 8). ).

  In the second embodiment, the dustproof member 60 further has two opposing wipers 66. The two wipers 66 are disposed on the stopper ring 61, and one end abuts against the small annular portion 63 of the stopper ring 61 to give the screw shaft 20 a dust removing effect and a dustproof effect. Since the wiper 66 is a well-known technique, a detailed description thereof is omitted.

  Due to the structural features described above, when the same nut 30 is used, the stopper ring 61 is fastened and fixed to the nut 30 along the axial direction, so that the axial strength of the entire structure is improved and a safe protective effect is obtained when used. Can be increased.

  The dustproof member 60 further has a dustproof ring 67. As shown in FIG. 9, the dust-proof ring 67 is disposed in the first annular groove 35 of the nut 30 so as to contact the small annular portion 63 of the stopper ring 61, and the outer diameter D11 is outside the small annular portion 63 of the stopper ring 61. It is smaller than the diameter D9. Due to the structural features described above, the dustproof effect can be improved.

DESCRIPTION OF SYMBOLS 10 Ball screw 20 Screw shaft 22 Screw groove 30 Nut 31 End part 32 Screw hole 33 Fixed hole 34 Screw groove 35 First annular groove 36 Second annular groove 37 Third annular groove 38 Second passage 40 Reflux member 42 First passage 44 Spiral path 46 Load path 48 Ball 50 Dustproof member 51 Dustproof ring 52 Stopper ring 53 Fitting ring 54 Packing ring D1, D5, D6 Outer diameter D2 Pitch diameter D4 Diameter D7 Inner diameter T Thickness 12 Ball screw 60 Dustproof member 61 Stopper ring 62 Large annular part 63 Small annular part 64 Perforation 65 Fixing member 66 Wiper 67 Dust-proof ring D3 Diameter D9, D11 Outer diameter D10 Inner diameter

Claims (5)

It has a screw shaft, nuts, multiple balls, and dustproof members.
The nut includes two opposed end portions, a screw hole that penetrates the two end portions and meshes with the screw shaft, and a first annular groove, a second annular groove, and a third annular groove formed at one end. The first annular groove, the second annular groove, and the third annular groove are formed so as to be arranged in order from the inside to the outside along the axial direction of the screw shaft, and in the radial direction of the screw hole. Connected,
A plurality of the balls are disposed between the screw shaft and the nut;
The dust-proof member has a dust-proof ring, a stopper ring, and a fitting ring, the dust-proof ring is disposed in the first annular groove of the nut, and the stopper ring is disposed on the nut so as to contact the dust-proof ring. Arranged in the second annular groove, the fitting ring is arranged in the third annular groove of the nut so as to abut against the stopper ring,
The outer diameter of the stopper ring is larger than the outer diameter of the dust-proof ring and smaller than the diameter of the third annular groove,
Ball screw.   The ball screw according to claim 1, wherein an outer diameter of the stopper ring is smaller than an outer diameter of the fitting ring.   The ball screw according to claim 1 or 2, wherein an inner diameter of the stopper ring is larger than an outer diameter of the screw shaft and smaller than or equal to a pitch diameter of the ball screw.   The ball screw according to claim 1, wherein the hardness of the stopper ring is smaller than the hardness of the fitting ring or the nut. It has a screw shaft, nuts, multiple balls, and dustproof members.
The nut includes two opposed end portions, a screw hole that penetrates the two end portions and meshes with the screw shaft, and a first annular groove, a second annular groove, and a third annular groove formed at one end. The first annular groove, the second annular groove, and the third annular groove are formed so as to be arranged in order from the inside to the outside along the axial direction of the screw shaft, and in the radial direction of the screw hole. Connected,
A plurality of the balls are disposed between the screw shaft and the nut;
The dust-proof member has a stopper ring and a plurality of fixing members, and the stopper ring is fitted to the screw shaft and has a large annular portion and a small annular portion, and the large annular portion is one of the nuts. Abutting against the end, the small annular part is connected to the large annular part, arranged in the second annular groove of the nut to shield the third annular groove of the nut, and a plurality of the fixing members are Fixing the stopper ring to the nut along the axial direction of the screw shaft;
The outer diameter of the small annular portion of the stopper ring is larger than the diameter of the first annular groove of the nut and smaller than the diameter of the third annular groove of the nut,
Ball screw.

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