TWI443274B - Ball screw with reflow element - Google Patents

Description

Ball screw with reflow element

The invention is a linear transmission element, in particular a ball screw with a reflow element.

Today's ball screws are used more and more in industry. In addition to being a high-precision effect of linear feed transmission, others have the advantages of low friction loss rate, high energy conversion rate, low noise and high rigidity. Therefore, the importance of the ball screw for various industrial applications and tools today is not to be said. In the current ball screw design, in order to allow the balls between the screw and the nut to continuously circulate and eliminate the stress, a reflow element is arranged at the rolling groove of the screw at the two end faces of the nut, and the reflow element is inside the ball screw. The rolling element can be reflowed back to the screw and nut after the screw and nut are actuated. Therefore, how to develop a more competitive product for the reflow component has naturally become the focus of the industry.

Referring to FIG. 1 to FIG. 3 , it is a reflow element ( 1 ) commonly used in the industry. The reflow element ( 1 ) is integrally formed, and its appearance is a cylinder, and a perforation is provided on the cylinder ( 11), the perforation (11) penetrates both end faces of the cylinder, and the inner edge of the perforation (11) is provided with more than one guiding portion (12) (usually two, four in total) The number of the guides is relative to the screw and the nut The number of rolling grooves) (commonly referred to in the industry as the guiding portion: nails), the guiding portion (12) is mainly responsible for guiding the rolling elements into and out of the reflow element (1) as described in the preceding paragraph, the reflow element (1) Mounted on the end faces of the nut of the ball screw (not shown), and the guiding portion (12) is formed to protrude toward the rolling groove (21) of the screw (2), and is embedded in the rolling groove (21) Medium (as shown in Figure 3), so that the rolling elements in the rolling groove (21) can be guided into the return channel (13) and reflowed to return the rolling member back between the screw (2) and the nut, but the foregoing The reflow element (1) has the following problems after use: although the reflow element (1) has the advantages of smooth path and high speed operation, since the guide portion (12) is embedded in the screw (2) In the rolling groove (21), the inner diameter (d) of the perforation (11) of the reflow element (1) is smaller than the outer diameter (D) of the screw (2), so that it is integrally formed with the guiding portion (12) for mounting. The reflow element (1) must have the rolling groove (21) of the screw (2) spirally extended to the end surface (not shown) of the screw (2), that is, the rolling groove (21) is open to the end surface ( The general industry calls the teeth design), such as In turn, the reflow element (1) can screw the guiding portion (12) into the rolling groove (21) from the end surface of the screw (2), and the reflow element (1) is attached to the two nuts. End face; however, the current tapping screw (2) leaves a notch at the end face, causing the end face to exhibit a non-integrity surface, when both ends of the screw (2) are mounted on the bearing housing of the machine (not drawn ) because of the two The end face system provides bearing bearing of the bearing seat, and when the starting machine motor causes the screw to operate, the axial end faces of the screw will generate an axial load due to the rotational inertia, and the axial load is caused by The end face is a non-complete surface factor, resulting in uneven distribution of the load on the end face and the bearing, in addition to causing crush damage on the bearing end face mounted on the bearing block of the machine block, thereby causing the screw to flex and deform in the running state. The phenomenon not only directly affects the smoothness of the circulation of the reflow element, but also reduces the service life of the ball screw.

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, an object of the present invention is to develop a reflow element which can be applied to a screwless screw, and which is mounted on both end faces of the nut.

In order to achieve the above object, the present invention is a ball screw having a reflow element, comprising: a plurality of rolling elements; a screw extending in a direction of a strip shape in a direction, defining the extending direction as an axial direction, The screw system is provided with a plurality of spiral-shaped rolling grooves; a nut is provided with a through hole for the screw to be penetrated, and the inner edge surface of the through hole is provided with a rolling groove opposite to the rolling groove, the rolling The groove and the rolling groove system form a plurality of load paths, and each end of the nut has an end surface in the axial direction, and the end surface is provided with a plurality of return holes penetrating through the other end face, and the return holes are spaced apart, and the two end faces are respectively provided a first return flow path, the two ends of the first return flow path are respectively engaged with the return hole and the rolling groove; two reflow elements are respectively attached to the two end faces of the nut, and the reflow element comprises: the first member And the second member, the first member and the second member are stacked and combined into the reflow element; the first member is provided with a first perforation, at least one groove track and at least one first guiding portion; The second member is provided with a second through hole, at least one through channel, and at least one second guiding portion. The first guiding portion and the second guiding portion are respectively embedded in the rolling groove, and the first through hole is a second perforation is provided for the screw to pass through, the groove channel and the channel forming a second half return channel, the second half return channel and the first half return channel forming a return channel, and the return channel, The return hole and the load path constitute a circulation path, the cycle a diameter is provided for the rolling member; wherein an inner diameter of the first inner diameter surface of the first perforation and the first radial surface of the first guiding portion form a virtual tangent circle is larger than an outer diameter of the screw The inner diameter of the second inner diameter surface of the second perforation and the second radial surface of the second guiding portion form a virtual tangent circle is larger than the outer diameter of the screw.

In order to further understand the features and technical contents of the present invention, please The description of the embodiments of the present invention and the drawings are to be construed as illustrative and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the present invention will be further described with reference to the accompanying drawings, in which: FIG. 4 is a schematic view of the ball screw of the present invention having a reflow element.

Figure 5 is a combination view of a ball screw with a reflow element of the present invention.

Figure 6 is a cross-sectional view in the five-axis direction of the figure.

Figure 7 is an end elevational view of the first component of the reflow element of the present invention.

Figure 8 is an end elevational view of the second component of the reflow element of the present invention.

Referring to Figures 4 to 8, first, the reflow element (3) of the present invention is used for the ball screw of the plurality of rolling grooves (11) and the rolling groove (211), and the reflow element (3) The number of the guiding portions (the first guiding portion (312) and the second guiding portion (322)) is set relative to the number of the rolling grooves (11) and the rolling grooves (211), and the reflow of the present invention is highlighted for convenience. The structural design of the component (3), the following preferred embodiment uses a ball screw of four rolling grooves (11) and rolling grooves (211) for illustration, but the present invention basically only needs two rolling grooves (11) and rolling grooves. The ball screw of (211) can be applied, so if there are three or more rolling grooves (11) and rolling grooves (211) And the configuration of the reflow element (3) is the same as the scope of the claimed invention, and is also included in the scope of the present invention. DETAILED DESCRIPTION OF THE INVENTION A preferred embodiment of the present invention is a ball screw having a reflow element, comprising: a plurality of rolling elements (4); a screw (1) extending in a longitudinal direction into a strip-like configuration , the extension direction is defined as the axial direction (X), the screw (1) is provided with four spiral rolling grooves (11); a nut (2) is provided with a thread for the screw (1) to penetrate a hole (21), 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) constitute four load paths (90), the end of the axial direction (X) of the nut (2) has an end surface (24), and the end surface (24) is provided with four return holes (22) penetrating through the other end surface (24), four The return holes (22) are spaced apart, and the two end faces are respectively provided with four first half return channels (23), and the two ends of each of the first half return channels (23) and one of the return holes (22) And the rolling groove (211) is engaged, the first half return channel (23) is a convex arc structure; two reflow elements (3) are respectively attached to the two end faces (24) of the nut, the reflow element ( 3) comprising: a first member (31) and a second member (32) The first member (31) and a second member (32) based mining axial direction (X) are combined into a stack of the circulating element (3); the first configuration The member (31) is provided with a first through hole (313), four groove paths (311) and two first guiding portions (312); the second member (32) is provided with a second through hole (323), four pieces a channel (321) and two second guiding portions (322), wherein the two first guiding portions (312) and the two second guiding portions (322) are respectively embedded in the rolling groove (11) And, when the first member (31) is combined with the second member (32), the first guiding portion (312) is provided with a second inner diameter surface (3231) that abuts against the second through hole (323). a first bearing surface (3121), the second guiding portion (322) is provided with a second bearing surface (3221) abutting against the first inner diameter surface (3131) of the first through hole (313) Therefore, the first guiding portion (312) and the second guiding portion (322) can have better strength when guiding the rolling element (4) (because the rolling member will first hit the guiding portion and then enter the following description a return passage) for extending the service life of the first guiding portion (312) and the second guiding portion (322); the first through hole (313) and the second through hole (323) are provided for the screw (1) Wherein, the groove channel (311) and a channel (321) form a second half return channel, the second half return channel is a concave arc structure, and the reflow element (3) Having four second-half return passages, four of the second-half return passages and four of the first-half return passages (23) constitute four return passages, and one of the two return passages respectively engages one of the return holes (22) And the other end of the return flow path is coupled with a load path (90) to form a circulation path, and so on, to form a total of four circulation paths, and the four of the circulation paths respectively set the plurality of scrolls Furthermore, it can be clearly seen from FIG. 7 and FIG. 8 that the present invention is for the reflow element (3) to be used for a screw that does not have teeth (as shown in FIG. 4, the rolling groove (11) does not extend to the screw (1). The end surface (12) is such that the end surface (12) is a complete plane), so the invention divides the radial direction of the reflow element (3) into a first member (31) and a second member (32), which can be It is found that the two first guiding portions (312) of the first member (31) are distributed within 180 degrees of the circumferential angle of the first through hole (313), and the first inner diameter of the first through hole (313) is made. The surface (3131) and the first radial surface (3122) of the first guiding portion (312) form a virtual tangent circle (5) (note: tangent circle (5) and first radial surface ( 3122) and the first inner diameter surface (3131) need only be partially tangent, but the tangent circle (5) cannot interfere with the first radial surface (3122) and the first inner diameter surface (3131). The inner diameter (D2) is greater than the outer diameter (D1) of the screw (1); as can be seen from FIG. 8, the two second guiding portions (322) of the second member (32) are distributed over the second perforation. (323) within a circumferential angle of 180 degrees, and the second inner diameter surface (3231) of the second perforation (323) and the two second guiding portions (322) The second radial surface (3222) constitutes a virtual tangent circle (5) (note: the tangent circle (5) and the second radial surface (3222) and the second inner diameter surface (3231) need only partial tangency Yes, but the inner diameter (D3) of the tangent circle (5) that cannot interfere with the second radial surface (3222) and the second inner diameter surface (3231) is greater than the screw (1) The outer diameter (D1).

The structure and configuration of each component of the present invention are described above. The following describes the assembly method of the reflow component of the present invention: the first inner diameter surface (3131) of the first through hole (313) and the first guiding portion are used in the present invention. The inner diameter (D2) of the virtual tangential circle (5) formed by the first radial surface (3122) of (312) is greater than the outer diameter (D1) of the screw (1), and the second perforation (323) The inner diameter (D3) of the virtual inner tangent circle (5) formed by the second inner diameter surface (3231) and the second radial surface (3222) of the second guiding portion (322) is larger than the screw (1) The outer diameter (D1) is characterized in that the first member (31) and the second member (32) can be directly threaded through the screw (1), and the first member (31) and the second member (32) After being disposed on the screw (1), the first guiding portion (312) and the second guiding portion (322) are respectively embedded in the corresponding rolling grooves (11), and then the first member (31) And the second member (32) is stacked into the reflow element (3) by an axial direction (X), and the groove path (311) and the through channel (321) form a second half return path. The reflow elements form a total of four second half return channels, and the second half return flow system and the first half return flow path (23) Four return channels, and two return channels (one return surface on each end of the nut), a return hole (22) and a load path (90) form a circulation path, which form a total of four circulation paths, and the four circulation paths are respectively Setting a plurality of the rolling elements (4), that is, completing the assembly of the ball screw Process. Therefore, according to the design of the reflow element, the screw does not need to be toothed, and the two ends of the screw are a complete plane. When the screw is installed on the machine, the end face of the screw and the bearing can be completely supported. To improve the problem of conventional technology.

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.

Conventional technology

(1) ‧‧‧Reflux components

(11) ‧‧‧Perforation

(12) ‧ ‧ Guidance Department

(13) ‧‧‧ Return Road

(2)‧‧‧ screw

(21) ‧ ‧ rolling grooves

(D) ‧ ‧ OD

(d) ‧ ‧ inner diameter

this invention

(1)‧‧‧ screw

(11) ‧ ‧ rolling groove

(12) ‧‧‧ end faces

(2)‧‧‧ Nuts

(21)‧‧‧through holes

(211)‧‧‧ rolling trough

(22)‧‧‧Return holes

(23) ‧‧‧First half return channel

(24) ‧‧‧ end faces

(3) ‧‧‧Reflux components

(31) ‧ ‧ first component

(311) ‧‧‧ Groove Road

(312) ‧‧‧First Guidance

(3121) ‧‧‧First bearing surface

(3122)‧‧‧First radial plane

(313)‧‧‧First perforation

(3131)‧‧‧First inner diameter surface

(32) ‧‧‧Second components

(321) ‧‧‧ Channel

(322)‧‧‧Second guidance

(3221) ‧‧‧Second bearing surface

(3222) ‧‧‧second radial plane

(323)‧‧‧Second perforation

(3231)‧‧‧Second inner diameter surface

(4) ‧‧‧Rolling parts

(5) ‧ ‧ tangential circle

(D1) ‧ ‧ OD

(D2, D3) ‧‧ ‧ Inside diameter

(90)‧‧‧Load path

(X)‧‧‧Axis direction

Figure 1 is a perspective view of a reflow element of the prior art.

Figure 2 is a side view of a perspective view of a reflow element of the prior art.

Figure 3 is an end view of a conventional reflow element in cooperation with a screw.

Figure 4 is an exploded view of the ball screw with the reflow element of the present invention.

Figure 5 is a combination view of a ball screw with a reflow element of the present invention.

Figure 6 is a cross-sectional view in the five-axis direction of the figure.

Figure 7 is an end elevational view of the first component of the reflow element of the present invention.

Figure 8 is an end elevational view of the second component of the reflow element of the present invention.

(1)‧‧‧ screw

(11) ‧ ‧ rolling groove

(12) ‧‧‧ end faces

(2)‧‧‧ Nuts

(21)‧‧‧through holes

(211)‧‧‧ rolling trough

(22)‧‧‧Return holes

(23) ‧‧‧Half return flow

(24) ‧‧‧ end faces

(3) ‧‧‧Reflux components

(31) ‧ ‧ first component

(311) ‧‧‧ Groove Road

(312) ‧ ‧ Guidance Department

(313)‧‧‧First perforation

(3131)‧‧‧First inner diameter surface

(32) ‧‧‧Second components

(321) ‧‧‧ Channel

(322) ‧ ‧ Guidance

(323)‧‧‧Second perforation

(3231)‧‧‧Second inner diameter surface

Claims (2)

A ball screw with a reflow element, comprising: a plurality of rolling elements; a screw extending in a longitudinal direction into a strip shape defining the extending direction as an axial direction, the screw system being provided with a plurality of spiral rolling grooves a nut having a through hole through which the screw is disposed, the inner edge surface of the through hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove form a plurality of load paths, and the nut Each of the two ends of the axial direction has an end surface, and the end surface is provided with a plurality of return holes extending through the other end surface. The return holes are spaced apart, and the end faces are respectively provided with a first half return flow path, and the first half return flow path The two ends are respectively connected to the return hole and the rolling groove; the two reflow elements are respectively attached to the two end faces, and the reflow element comprises: a first member and a second member, and the first member and the second member are coupled to the shaft The first component is provided with a first through hole, at least one groove track and at least one first guiding portion; the second member is provided with a second through hole, at least one channel, and at least a second guide The first guiding portion and the second guiding portion are respectively embedded in the rolling groove, and the first through hole and the second through hole are provided for the screw to be inserted therein, and the groove channel and the through groove channel are configured a second half return flow path, the second half return flow path and the first half return flow path constitute a return flow path, and the The return passage, the return hole and the load path form a circulation path for the rolling member; wherein the first inner diameter surface of the first perforation and the first radial surface of the first guiding portion are formed An inner diameter of a virtual tangent circle is larger than an outer diameter of the screw; a second inner diameter surface of the second perforation and a second radial surface of the second guiding portion form a virtual tangent circle inner diameter system More than the outer diameter of the screw; wherein the number of the first guiding portions is an even number or an odd number, the number of the second guiding portions is an even number or an odd number, and the first guiding portion is distributed in the first Within a 180 degree circumferential angle of a perforation, the second guiding portion is distributed within 180 degrees of the circumferential angle of the second perforation. The ball screw with a reflow element according to claim 1, wherein the first guiding portion is provided with a first bearing surface that abuts against the second inner diameter surface of the second perforation, the second guiding The second system has a second bearing surface that abuts against the first inner diameter surface of the first perforation.