CN210661252U - Ball screw with end plug - Google Patents
Ball screw with end plug Download PDFInfo
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- CN210661252U CN210661252U CN201920861371.7U CN201920861371U CN210661252U CN 210661252 U CN210661252 U CN 210661252U CN 201920861371 U CN201920861371 U CN 201920861371U CN 210661252 U CN210661252 U CN 210661252U
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- backflow
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000010992 reflux Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Abstract
The utility model discloses a ball screw with end plug, it mainly includes: a screw having an external thread groove; a nut having an internal circulation path and an internal thread groove, the internal thread groove and the external thread groove forming a load path; the steel ball is arranged in a load path between the screw and the screw cap; the end plugs are respectively arranged at the front end and the rear end of the screw cap, each end plug is provided with a first backflow piece and a second backflow piece, each backflow piece is provided with a backflow groove, the first backflow piece is connected with the second backflow piece in a combined mode so that the first backflow groove and the second backflow groove form a backflow path together, the backflow path is communicated between the internal circulation path and the load path, the thickness of the bottom of the first backflow groove is the same as that of the bottom of the second backflow groove, and the steel balls can roll among the load path, the backflow path and the internal circulation path in a circulating mode; the effects of preventing the end plug from generating a fault difference in a backflow path after being combined, reducing noise, reducing impact, prolonging the service life and the like are achieved.
Description
Technical Field
The present invention relates to ball screws, and more particularly to a ball screw having an end plug.
Background
Accordingly, the ball screw has become an important component of a positioning and measuring system in precision science and technology and machinery industry due to its characteristics of high positioning accuracy, long service life, low pollution, capability of high-speed forward and backward transmission and variable transmission, etc.
However, the ball screw achieves a high-precision linear transmission effect mainly by means of rolling of a plurality of steel balls between the screw and the nut. In order to make the steel balls continuously roll circularly, the ball screw is structurally matched with the circulating path of the steel balls, and a plug is arranged in the screw cap to be used as a backflow element.
However, due to the complicated shape of the end plug, it is not only expensive to manufacture but also difficult to manufacture if it is manufactured in one piece. Thus, current end plugs are primarily made of multiple pieces, with two pieces being the most common. However, the end plugs of the two-piece combination are easy to generate a break difference at the combination position after combination, which not only easily generates structural damage at the combination position, but also causes discontinuity of the curve of the backflow path due to the break difference, so that the steel balls can generate noise and impact when passing through the break difference position, and further have adverse effects such as reduction of service life.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a ball screw with end plug, the end plug that aims at solving ball screw has the problem that the offset produced easily.
Based on this, the utility model mainly adopts the following technical means to realize the above-mentioned purpose.
A ball screw with an end plug, comprising: a screw rod, the outer surface of which is provided with a spiral outer thread groove; a nut, which has a through hole for the screw to pass through axially, the hole wall of the through hole forms an inner circulation path and an inner thread groove, and the inner thread groove and the outer thread groove form a load path together; a plurality of steel balls disposed in a load path between the screw and the nut; the two end plugs are respectively arranged at the front end and the rear end of the screw cap, each end plug is provided with a first backflow piece and a second backflow piece, each first backflow piece is provided with a first backflow groove, each second backflow piece is provided with a second backflow groove, the first backflow piece and the second backflow piece are connected in a combined mode so as to form a backflow path together by the first backflow groove and the second backflow groove, the backflow path is communicated between the inner circulation path and the load path, and the thickness of the bottom of the first backflow groove is the same as that of the bottom of the second backflow groove; the steel balls roll circularly among the load path, the backflow path and the inner circulating path.
Furthermore, the front end face and the rear end face of the nut are respectively provided with an installation groove which is sunken inwards, and the end plugs are respectively installed in the installation grooves.
The first reflux piece is provided with a first combination part, the second reflux piece is provided with a second combination part, and the first combination part is connected with the second combination part so as to enable the first reflux piece to be combined and connected with the second reflux piece.
Further, the thickness of the first bottom wall of the first backflow groove of the first backflow piece of the end plug and the thickness of the second bottom wall of the second backflow groove of the second backflow piece of the end plug can be obtained by the following formula:
T＝R-(R-r-t)×cos(α)-r
LEAD: lead
PCD: pitch circle diameter
BCD: center diameter of through hole
Plane A: tangent plane of PCD and through hole central straight axis
α angle between L1 and L2
L1: the shortest distance connecting line of the central axis of the ball screw and the central axis of the through hole
L2: normal line of the plane A intersects with the central axis of the ball screw
R: outer radius of end plug
r: radius of through hole
t: thickness of catheter
T1: first bottom wall thickness of first flow channel of first flow return of end plug
T2: second bottom wall thickness of second reflow channel of end plug second reflow element
R1: radius of curvature in the return path
θ: lead angle
Furthermore, the first backflow groove and the second backflow groove are respectively provided with a first bottom wall and a second bottom wall, the thicknesses of the first bottom wall and the second bottom wall are the same, the first bottom wall is provided with a first connecting side facing the second bottom wall, the second bottom wall is provided with a second connecting side facing the first bottom wall, the first connecting side is attached to the second connecting side, and the top surfaces of the first bottom wall and the second bottom wall form a continuously extending arc surface together.
After the technical means is adopted, the steel balls are arranged in the load path formed by the internal thread groove and the external thread groove; two backflow pieces arranged at the end plugs at the front end and the rear end of the screw cap are combined and connected, a backflow path formed by the backflow pieces and the backflow groove is communicated between the internal circulation path and the load path, and the thickness of the bottom of the first backflow groove is the same as that of the bottom of the second backflow groove, so that the steel balls can circularly roll among the load path, the backflow path and the internal circulation path; thereby achieving the effects of reducing noise, reducing impact, prolonging service life and the like by preventing the end plug from generating a break difference in a backflow path after being combined.
Drawings
Fig. 1 is an exploded perspective view of a preferred embodiment of the present invention.
Fig. 2 is a perspective assembly view of the embodiment shown in fig. 1.
Fig. 3 is a partial exploded view of the embodiment of fig. 1.
Fig. 4 is a partially exploded view of the embodiment of fig. 1 from another perspective.
FIG. 5 is a partial component assembly view of the embodiment shown in FIG. 1.
Fig. 6 is an assembled cross-sectional view of the embodiment shown in fig. 1.
Fig. 7 is a plan view of the embodiment shown in fig. 1.
Fig. 8 is a plan view of the embodiment shown in fig. 1.
Fig. 9 is a front view of the embodiment shown in fig. 5.
Description of the symbols
External thread groove 11 of screw 10
Ball screw central shaft 12 nut 20
Load path 24 of female thread groove 23
End plug 40 first return 41
Second connecting side 424 arc surface 43
LEAD: lead
PCD: pitch circle diameter
BCD: center diameter of through hole
Plane A: tangent plane of PCD and through hole central straight axis
α angle between L1 and L2
L1: the shortest distance connecting line of the central axis of the ball screw and the central axis of the through hole
L2: normal line of the plane A intersects with the central axis of the ball screw
R: outer radius of end plug
r: radius of through hole
t: wall thickness of conduit part
R1: radius of curvature in the return path
θ: lead angle
T1: first bottom wall thickness of first flow channel of first flow return of end plug
T2: a second bottom wall thickness of a second return groove of the second return member of the end plug.
Detailed Description
In order to further understand and appreciate the features and characteristics of the present invention, the following preferred embodiments are illustrated in the drawings:
referring to fig. 1 to 8, a ball screw 100 with end plugs according to a preferred embodiment of the present invention mainly includes a screw 10, a nut 20, a plurality of steel balls 30 and two end plugs 40, wherein:
referring to fig. 1 to 2 and 6, the outer surface of the screw 10 has a spiral outer thread groove 11, and the axial position of the spiral outer thread groove is formed as a ball screw central axis 12.
Referring to fig. 1 to 2 and 6, a through hole 21 is axially formed through the nut 20, the screw 10 is inserted through the through hole 21, and an internal circulation path 22 and an internal thread groove 23 are formed on the wall of the through hole 21, so that a load path 24 is formed by the internal thread groove 23 and the external thread groove 11. The front and rear end surfaces of the nut 20 are respectively provided with an installation groove 25 depressed inward.
Referring to fig. 1 to 2 and 6, the steel balls 30 are disposed in the load path 24 between the screw 10 and the nut 20.
Referring to fig. 1 to 9, the two end plugs 40 are respectively installed in the installation grooves 25 of the nut 20. The end plug 40 has a return path 49, so as to communicate between the inner circulation path 22 and the load path 24 through the return path 49, so that the steel balls 30 can circularly roll between the load path 24, the return path 49 and the inner circulation path 22. The end plug 40 has a first backflow element 41 and a second backflow element 42, the first backflow element 41 has a first backflow groove 411 and a first combination portion 412, the second backflow element 42 has a second backflow groove 421 and a second combination portion 422 and a conduit portion 425, and the first combination portion 412 and the second combination portion 422 are combined and connected, so that the first backflow groove 411 and the second backflow groove 421 jointly form the backflow path 49. The thickness of the bottom of the first backflow groove 411 is the same as the thickness of the bottom of the second backflow groove 421, and more specifically, the first backflow groove 411 and the second backflow groove 421 respectively have a first bottom wall 413 and a second bottom wall 423, the thickness of the first bottom wall 413 is the same as the thickness of the second bottom wall 423, the first bottom wall 413 has a first connecting side 414 facing the second bottom wall 423, the second bottom wall 423 has a second connecting side 424 facing the first bottom wall 413, the first connecting side 414 is attached to the second connecting side 424, and the top surfaces of the first bottom wall 413 and the second bottom wall 423 together form a continuously extending arc surface 43.
Therefore, the above description is a description of each component of the ball screw 100 with end plugs and its assembly method, and then its use characteristics are described as follows:
first, since the thickness of the bottom of the first backflow groove 411 of the end plug 40 is the same as the thickness of the bottom of the second backflow groove 421 (i.e., the thickness of the first bottom wall 413 and the second bottom wall 423 are the same), after the first backflow element 41 and the second backflow element 42 are combined, the first connecting side 414 is attached to the second connecting side 424, and the top surfaces of the first bottom wall 413 and the second bottom wall 423 jointly form a continuously extending arc surface 43, so that the curve of the backflow path 49 is maintained in an arc-shaped continuously extending state, thereby avoiding a break at the joint between the first backflow groove 411 and the second backflow groove 421 (i.e., the top surfaces of the first bottom wall 413 and the second bottom wall 423), and further achieving the effects of reducing noise, reducing impact, increasing service life and the like when the steel ball 30 passes through the backflow path 49.
Next, as shown in fig. 6 to 8, to obtain the thickness values of the first bottom wall 413 at the bottom of the first reflux groove 411 and the second bottom wall 423 at the bottom of the second reflux groove 421 of the end plug 40, the following formulas can be obtained:
T＝R-(R-r-t)×cos(α)-r
in this implementation, assume:
screw outer diameter: 36mm
LEAD: 20mm
The diameter of the steel ball: 6.35mm
PCD (pitch circle diameter): 37.4
BCD (through hole center diameter): 54mm
Plane A: tangent plane of PCD and through hole central straight axis
α angle between L1 and L2
L1: the shortest distance connecting line of the central axis of the ball screw and the central axis of the through hole
L2: normal line of the plane A intersects with the central axis of the ball screw
R (end plug outer radius): 6mm
r (through-hole radius): 3.3mm
t (pipe wall thickness of pipe portion): 1mm
T1 (first bottom wall thickness of first return channel of end plug first return member)
T2 (second bottom wall thickness of second return groove of end plug second return)
R1: radius of curvature in the return path
θ (lead angle): 9.66
Wherein:
substituting the above values into the following formula
T＝R-(R-r-t)×cos(α)-r
＝6-(6-3.3-1)×cos(46.16°)-3.3
About 1.5
I.e. the thickness T required at the bottom of the return path is about 1.5mm
I.e. T1 (first bottom wall thickness of the first return channel of the first return piece of the end plug) is about 1.5mm
T1-T2, T2 (the second bottom wall thickness of the second return groove of the second return piece of the end plug) is also about 1.5 mm.
T＝T1＝T2
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent variations of the present invention that are within the scope of the present invention are considered by the skilled in the art.
Claims (5)
1. A ball screw with an end plug, comprising:
a screw rod, the outer surface of which is provided with a spiral outer thread groove;
a nut, which has a through hole for the screw to pass through axially, the hole wall of the through hole forms an inner circulation path and an inner thread groove, and the inner thread groove and the outer thread groove form a load path together;
a plurality of steel balls disposed in a load path between the screw and the nut;
the two end plugs are respectively arranged at the front end and the rear end of the screw cap, each end plug is provided with a first backflow piece and a second backflow piece, each first backflow piece is provided with a first backflow groove, each second backflow piece is provided with a second backflow groove, the first backflow piece and the second backflow piece are connected in a combined mode so as to form a backflow path together by the first backflow groove and the second backflow groove, the backflow path is communicated between the inner circulation path and the load path, and the thickness of the bottom of the first backflow groove is the same as that of the bottom of the second backflow groove;
the steel balls roll circularly among the load path, the backflow path and the inner circulating path.
2. The ball screw with an end plug of claim 1, wherein: the front end face and the rear end face of the nut are respectively provided with an installation groove which is sunken inwards, and the end plugs are respectively installed in the installation grooves.
3. The ball screw with an end plug of claim 1, wherein: the first reflux piece is provided with a first combination part, the second reflux piece is provided with a second combination part, and the first combination part is connected with the second combination part so as to enable the first reflux piece to be combined and connected with the second reflux piece.
4. The ball screw with an end plug of claim 1, wherein: the thickness of the first bottom wall of the first backflow groove of the first backflow piece of the end plug and the thickness of the second bottom wall of the second backflow groove of the second backflow piece of the end plug can be obtained by the following formula:
T＝R-(R-r-t)×cos(α)-r
LEAD: lead
PCD: pitch circle diameter
BCD: center diameter of through hole
Plane A: tangent plane of PCD and through hole central straight axis
α angle between L1 and L2
L1: the shortest distance connecting line of the central axis of the ball screw and the central axis of the through hole
L2: normal line of the plane A intersects with the central axis of the ball screw
R: outer radius of end plug
r: radius of through hole
t: thickness of catheter
T1: first bottom wall thickness of first flow channel of first flow return of end plug
T2: second bottom wall thickness of second reflow channel of end plug second reflow element
R1: radius of curvature in the return path
θ: lead angle.
5. The ball screw with an end plug of claim 1, wherein: the first backflow groove and the second backflow groove are respectively provided with a first bottom wall and a second bottom wall, the first bottom wall and the second bottom wall are the same in thickness, the first bottom wall is provided with a first connecting side facing the second bottom wall, the second bottom wall is provided with a second connecting side facing the first bottom wall, the first connecting side is attached to the second connecting side, and the top surfaces of the first bottom wall and the second bottom wall form a continuously extending arc surface together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW108200701U TWM580639U (en) | 2019-01-15 | 2019-01-15 | Ball screw with end plug |
| TW108200701 | 2019-01-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210661252U true CN210661252U (en) | 2020-06-02 |
Family
ID=68050563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920861371.7U Active CN210661252U (en) | 2019-01-15 | 2019-06-10 | Ball screw with end plug |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN210661252U (en) |
| TW (1) | TWM580639U (en) |
-
2019
- 2019-01-15 TW TW108200701U patent/TWM580639U/en unknown
- 2019-06-10 CN CN201920861371.7U patent/CN210661252U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| TWM580639U (en) | 2019-07-11 |
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