CN117739081A - External circulation ball screw with semi-open reflux groove - Google Patents
External circulation ball screw with semi-open reflux groove Download PDFInfo
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- CN117739081A CN117739081A CN202211115368.3A CN202211115368A CN117739081A CN 117739081 A CN117739081 A CN 117739081A CN 202211115368 A CN202211115368 A CN 202211115368A CN 117739081 A CN117739081 A CN 117739081A
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- 238000010992 reflux Methods 0.000 title claims abstract description 73
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses an external circulation ball screw with a semi-open type reflux groove, which comprises a screw rod, a screw cap and a plurality of balls, wherein a spiral ball channel is formed between the screw rod and the screw cap, the radial periphery of the screw cap is recessed with the spiral reflux groove, the reflux groove and the ball channel are opposite in rotation direction, the screw cap is embedded with a first reflux device and a second reflux device, the first reflux device forms a curved first channel communicated with the ball channel and the reflux groove, the second reflux device forms a curved second channel communicated with the ball channel and the reflux groove, and each ball is arranged in the ball channel, the first channel, the reflux groove and the second channel to smoothly circulate and reflux.
Description
Technical Field
The invention relates to a ball screw; in particular to an external circulation ball screw with a semi-open reflux groove.
Background
The ball screw is classified into an external circulation type ball screw and an internal circulation type ball screw according to the reflux form of the balls.
The outer circulation type ball screw comprises a screw, a nut, a plurality of balls and an outer cover, wherein the nut is sleeved on the radial periphery of the screw, the outer cover is sleeved on the radial periphery of the nut, a spiral first groove is formed on the radial periphery of the screw, a spiral second groove is formed on the radial inner periphery of the nut, a spiral ball channel is formed on the first groove and the second groove relatively, the nut penetrates through a first backflow hole and a second backflow hole, the first backflow hole is communicated with one end of the second groove, the second backflow hole is communicated with the other end of the second groove, the radial periphery of the nut is recessed with a backflow groove, two ends of the backflow groove are respectively communicated with the first backflow hole and the second backflow hole, the ball channel, the first backflow hole, the backflow groove and the second backflow hole are sequentially communicated end to form a closed circulation type, and the balls are sequentially arranged in series in the ball channel, the first backflow hole, the backflow groove and the second backflow hole are positioned in the ball channel, and the balls bear the opposite acting force of the screw and the nut.
When the screw and the nut rotate relatively, the balls arranged in series roll circularly along the ball channel, the first backflow hole, the backflow groove and the second backflow hole, and the screw and the nut displace relatively along the axial direction of the screw.
The external circulation ball screw has the following problems and disadvantages in practical experience: the axial of first backward flow hole and second backward flow hole is sharp, and the orthographic projection of first backward flow hole and second backward flow hole along being on a parallel with the axial of screw rod is along the radial periphery of ball passageway extension to the nut, and first backward flow hole and second backward flow hole are along being on a parallel with the radial orthographic projection of screw rod and the axial quadrature of screw rod, and during the ball circulation roll, the ball is turned into the backward flow groove by first backward flow hole sharply, is turned into the second backward flow hole by the backward flow groove sharply again, and the smooth degree of ball circulation roll remains to improve.
Disclosure of Invention
The main object of the present invention is to provide an external circulation ball screw with a semi-open return groove.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an external circulation ball screw having a semi-open return channel comprising:
the radial periphery of the screw rod forms a spiral first groove;
the radial outer periphery of the screw is sleeved with the screw cap, a spiral second groove is formed in the radial inner periphery of the screw cap, a spiral ball channel is formed by the first groove and the second groove relatively, and a reflux groove is recessed in the radial outer periphery of the screw cap;
the first reflux device is embedded in the screw cap, a first channel is formed in the first reflux device, and the first channel is communicated with the ball channel and the reflux groove;
the second reflux device is embedded in the screw cap, a second channel is formed in the second reflux device, the second channel is communicated with the ball channel and the reflux groove, and the ball channel, the first channel, the reflux groove and the second channel are sequentially communicated to form a closed circulation type; the balls are arranged in the ball channel, the first channel, the reflux groove and the second channel for circulating reflux rolling;
the spiral back winding screw cap is adopted by the reflux groove, the rotation directions of the reflux groove and the ball channel are opposite, and the lead of the reflux groove is larger than that of the ball channel;
defining a virtual first plane opposite to the screw, wherein the axial extension direction of the screw is orthogonal to the first plane, the orthographic projections of the first channel and the second channel on the first plane are respectively curved, the first channel is mainly formed by connecting a first inlet channel and a first outlet channel, the first inlet channel and the first outlet channel are respectively curved, the first inlet channel is tangential to the ball channel and is tangential to the reflux groove, a virtual second plane is defined to be parallel to the axial direction of the screw, the second plane is orthogonal to the first plane, the orthographic projections of the first inlet channel and the second plane are along the rotation direction of the ball channel, the orthographic projections of the first outlet channel and the second plane are along the rotation direction of the reflux groove, the connecting part of the first inlet channel and the ball channel is defined as a first inlet, the connecting part of the first outlet channel and the reflux groove is a first outlet, and the axial distance between the first inlet channel and the first outlet channel is smaller than the lead of the ball channel along the nut so as to improve the rolling smoothness of the ball channel entering the reflux groove through the first channel;
the second channel is mainly formed by a second inlet channel and a second outlet channel which are communicated, the second inlet channel and the second outlet channel are respectively in a curved arc shape, the second inlet channel is communicated with the reflux groove in a tangential manner, the second outlet channel is communicated with the ball channel in a tangential manner, the orthographic projection of the second inlet channel on the second plane extends along the rotation direction of the reflux groove, the orthographic projection of the second outlet channel on the second plane extends along the rotation direction of the ball channel, the communicating position of the second inlet channel and the reflux groove is defined as a second inlet, the communicating position of the second outlet channel and the ball channel is defined as a second outlet, and the axial distance between the second inlet and the second outlet along the screw cap is smaller than the lead of the ball channel, so that the rolling smoothness of the ball entering the ball channel from the reflux groove through the second channel is improved;
the nut forms a spiral groove wall, the groove wall defines a reflux groove, two linear groove edges are formed at the radial periphery connection part of the groove wall and the nut, and the minimum distance between the groove edges is smaller than the outer diameter of the ball.
The ball circulation reflux rolling device has the main effects and advantages that the ball circulation reflux rolling device can gradually turn gradually in the ball circulation reflux rolling process through the relative composition of the ball channel, the first channel, the reflux groove and the second channel in space, and the smoothness of the ball circulation reflux rolling is obviously improved.
Drawings
Fig. 1 is an exploded perspective view of a first embodiment of the present invention.
Fig. 2 is a left side view of an embodiment of the present invention with the cover removed.
FIG. 3 is a partial left side view of an embodiment of the invention with the housing removed, showing engagement of the ball passageway, the first passageway and the return groove.
FIG. 4 is a partial left side view of an embodiment of the invention with the housing removed, showing engagement of the ball channel, the second channel and the return groove.
Fig. 5 is a schematic cross-sectional view of the first embodiment of the present invention, showing a cross-sectional state of the first embodiment along the first backflow hole, a portion of the ball passage communicating with the first backflow hole, and the backflow groove.
Fig. 6 is a schematic cross-sectional view of the first embodiment of the present invention, showing a cross-sectional state of the first embodiment along the second reflow hole, a portion of the ball passage communicating with the first reflow hole, and the reflow groove.
Fig. 7 is a partial radial cross-sectional view of a reflow tank of a first embodiment of the present invention.
Fig. 8 is a partial radial cross-sectional view of a reflow tank of a second embodiment of the present invention.
Detailed Description
Referring to the drawings, embodiments of the present invention are shown with an external circulation ball screw having a semi-open return channel, but these embodiments are for illustrative purposes only and are not limited to this configuration in the patent application.
As shown in fig. 1 to 7, the first embodiment of the external circulation ball screw with a semi-open type backflow groove includes a screw 10, a nut 20, a first backflow device 30, a second backflow device 40 and a plurality of balls 50, wherein the radial periphery of the screw 10 forms a spiral first groove 11, the radial periphery of the nut 20 is sleeved on the screw 10, the radial inner periphery of the nut 20 forms a spiral second groove 21, the first groove 11 and the second groove 21 form a spiral ball channel 12 relatively, the nut 20 is threaded through a first setting hole 22 and a second setting hole 23, the first setting hole 22 and the second setting hole 23 extend to the second groove 21 respectively, the radial periphery of the nut 20 is recessed by the first backflow groove 24, the first setting hole 22 and the second setting hole 23 extend to two ends of the backflow groove 24 respectively, the first backflow device 30 is embedded in the first setting hole 22, the inside of the first backflow device 30 forms a first channel 31, the first channel 31 is communicated with the ball channel 12 and the backflow groove 24, the second backflow device 40 is embedded in the second groove 24, the second backflow device 40 is embedded in the radial periphery of the first setting hole 22, the second backflow device 40 is embedded in the second setting hole 24, the second channel 41 is communicated with the second channel 41, and the second channel 41 is formed in sequence, and the second circulation ball channel 41 is communicated with the second channel 41.
The reflux groove 24 spirally winds the screw cap 20, the rotation directions of the reflux groove 24 and the ball channel 12 are opposite, and the lead of the reflux groove 24 is larger than that of the ball channel 12; in this example, the ratio of the lead of the return groove 24 to the lead of the ball passage 12 is preferably 3.5:1.
Defining a virtual first plane 92 opposite to the screw 10, wherein the axial extension direction of the screw 10 is orthogonal to the first plane 92, the orthographic projections of the first channel 31 and the second channel 41 on the first plane 92 are respectively curved, the first channel 31 is mainly formed by communicating a first inlet channel 32 with a first outlet channel 33, the first inlet channel 32 and the first outlet channel 33 are curved, the first inlet channel 32 is communicated with the ball channel 12 tangentially, the first outlet channel 33 is communicated with the reflux groove 24 tangentially, a virtual second plane 94 is defined parallel to the axial direction of the screw 10, the second plane 94 is orthogonal to the first plane 92, the orthographic projection of the first inlet channel 32 on the second plane 94 is extended along the rotation direction of the ball channel 12, the orthographic projection of the first outlet channel 33 on the second plane 94 extends along the rotation direction of the backflow groove 24, defines the connection position of the first inlet channel 32 and the ball channel 12 as the first inlet 34, the connection position of the first outlet channel 33 and the backflow groove 24 as the first outlet 35, the distance between the first inlet 34 and the first outlet 35 along the axial direction of the nut 20 is smaller than the lead of the ball channel 12, the first channel 31 and the backflow groove 24 form gradual connection, and the ball 50 gradually changes in the process of sequentially rolling the ball channel 12 through the first inlet channel 32 and the first outlet channel 33 into the backflow groove 24, so that the phenomenon of abrupt steering is not generated, and the rolling smoothness of the ball 50 entering the backflow groove 24 from the ball channel 12 through the first channel 31 can be improved.
The second channel 41 is mainly formed by connecting a second inlet channel 42 and a second outlet channel 43, the second inlet channel 42 and the second outlet channel 43 are respectively curved, the second inlet channel 42 is tangentially connected with the backflow groove 24, the second outlet channel 43 is tangentially connected with the ball channel 12, the orthographic projection of the second inlet channel 42 on the second plane 94 extends along the rotation direction of the backflow groove 24, the orthographic projection of the second outlet channel 43 on the second plane 94 extends along the rotation direction of the ball channel 12, the connection part of the second inlet channel 42 and the backflow groove 24 is defined as a second inlet 44, the connection part of the second outlet channel 43 and the ball channel 12 is defined as a second outlet 45, the distance between the second inlet 44 and the second outlet 45 along the axial direction of the nut 20 is smaller than the lead of the ball channel 12, a gradual connection groove in a gradual change mode is formed among the backflow groove 24, the second channel 41 and the ball channel 12, the ball 50 is gradually changed from the backflow groove 24 to the second inlet channel 42, the second outlet channel 43 and the ball channel 12, the gradual change direction of the ball 50 is gradually changed, the gradual change of the ball 50 is not generated, the smooth rolling phenomenon of the ball 24 is not changed, and the rolling from the second inlet channel 41 is smoothly changed to the ball channel 24.
The nut 20 forms a spiral groove wall 25, the groove wall 25 defines a reflux groove 24, two linear groove edges 26 are formed at the joint of the groove wall 25 and the radial periphery of the nut 20, the minimum distance between the groove edges 26 is smaller than the outer diameter of the ball 50, the reflux groove 24 forms a semi-open shape to the radial outside of the nut 20, and the groove edges 26 limit the ball 50 in the radial direction of the nut 20, so that the ball 50 is prevented from separating from the reflux groove 24 along the radial direction of the nut 20.
In the first embodiment, the ball channel 12, the first channel 31, the backflow groove 24 and the second channel 41 are spatially and oppositely configured, so that the smoothness of the circulating backflow rolling of the ball 50 is significantly improved.
The groove wall 25 is mainly composed of a first spiral supporting surface 252 and two spiral side surfaces 254, the radial cross section of the first supporting surface 252 is in an arc shape in cooperation with the balls 50, each side surface 254 is respectively connected with two ends of the first supporting surface 252 in the arc shape, each side surface 254 is respectively connected with the radial outer periphery of the nut 20 to form each groove edge 26, in this example, each side surface 254 is parallel to each other, the shortest distance between each side surface 254 is smaller than the outer diameter of the balls 50, and along the diameter direction of the nut 20, the groove wall 25 limits the balls 50 rolling through the backflow groove 24.
The first embodiment further includes a tubular housing 60, wherein the housing 60 surrounds the radial periphery of the nut 20, the housing 60 shields the reflow slot 24, and the housing 60 can protect the reflow slot 24 from external dust or foreign matters.
A gap 27 is formed between the ball 50 and the housing 60 in the circulation groove 24, and the gap 27 can be used as a space for providing a lubricant.
As shown in fig. 8, the second embodiment is different from the first embodiment mainly in that the groove wall 25 is mainly composed of two spiral limiting surfaces 256, two spiral second supporting surfaces 258 and two spiral side surfaces 254, the second supporting surfaces 258 are laterally opposite to each other, the limiting surfaces 256 are respectively connected with the second supporting surfaces 258 and the side surfaces 254, the side surfaces 254 are respectively connected with the radial outer periphery of the nut 20 to form the groove edges 26, and the balls 50 in the reflux groove 24 are in tangential contact with the second supporting surfaces 258 and the limiting surfaces 256.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An external circulation ball screw having a semi-open return channel, comprising:
the radial periphery of the screw rod forms a spiral first groove;
the radial outer periphery of the screw is sleeved with the screw cap, a spiral second groove is formed in the radial inner periphery of the screw cap, a spiral ball channel is formed by the first groove and the second groove relatively, and a reflux groove is recessed in the radial outer periphery of the screw cap;
the first reflux device is embedded in the screw cap, a first channel is formed in the first reflux device, and the first channel is communicated with the ball channel and the reflux groove;
the second reflux device is embedded in the screw cap, a second channel is formed in the second reflux device, the second channel is communicated with the ball channel and the reflux groove, and the ball channel, the first channel, the reflux groove and the second channel are sequentially communicated to form a closed circulation type;
the balls are arranged in the ball channel, the first channel, the reflux groove and the second channel for circulating reflux rolling;
the spiral back winding screw cap is adopted by the reflux groove, the rotation directions of the reflux groove and the ball channel are opposite, and the lead of the reflux groove is larger than that of the ball channel;
defining a virtual first plane opposite to the screw, wherein the axial extension direction of the screw is orthogonal to the first plane, the orthographic projections of the first channel and the second channel on the first plane are respectively curved, the first channel is mainly formed by connecting a first inlet channel and a first outlet channel, the first inlet channel and the first outlet channel are respectively curved, the first inlet channel is tangentially communicated with the ball channel, the first outlet channel is tangentially communicated with the reflux groove, a virtual second plane is defined to be parallel to the axial direction of the screw, the second plane is orthogonal to the first plane, the orthographic projections of the first inlet channel and the second plane are extended along the rotation direction of the ball channel, the orthographic projections of the first outlet channel and the second plane are extended along the rotation direction of the reflux groove, the communication position of the first inlet channel and the ball channel is defined as a first inlet, the communication position of the first outlet channel and the reflux groove is a first outlet, and the axial distance between the first inlet channel and the first outlet channel along the nut is smaller than the lead of the ball channel;
the second channel is mainly formed by a second inlet channel and a second outlet channel which are communicated, the second inlet channel and the second outlet channel are respectively in a curved arc shape, the second inlet channel is communicated with the reflux groove in a tangential manner, the second outlet channel is communicated with the ball channel in a tangential manner, the orthographic projection of the second inlet channel on the second plane extends along the rotation direction of the reflux groove, the orthographic projection of the second outlet channel on the second plane extends along the rotation direction of the ball channel, the communicating position of the second inlet channel and the reflux groove is defined as a second inlet, the communicating position of the second outlet channel and the ball channel is a second outlet, and the axial distance between the second inlet and the second outlet along the screw cap is smaller than the lead of the ball channel;
the nut forms a spiral groove wall, the groove wall defines a reflux groove, two linear groove edges are formed at the radial periphery connection part of the groove wall and the nut, and the minimum distance between the groove edges is smaller than the outer diameter of the ball.
2. The external circulation ball screw with semi-open type reflux groove as claimed in claim 1, wherein the groove wall is mainly composed of a first spiral supporting surface and two spiral side surfaces, the radial section of the first supporting surface is circular arc-shaped in cooperation with the balls, each side surface is respectively connected with two ends of the first supporting surface in the circular arc shape, and each side surface is respectively connected with the radial periphery of the nut to form each groove edge.
3. The external circulation ball screw with a semi-open type reflux groove according to claim 1, wherein the groove wall is mainly composed of two spiral limiting surfaces, two spiral second supporting surfaces and two spiral side surfaces, the second supporting surfaces are laterally opposite to each other, the limiting surfaces are respectively connected with the second supporting surfaces and the side surfaces, the side surfaces are respectively connected with the radial outer periphery of the nut to form groove edges, and the balls in the reflux groove are in tangential contact with the second supporting surfaces and the limiting surfaces.
4. The external circulation ball screw with semi-open circulation groove of claim 1, 2 or 3, further comprising a circular tubular housing, wherein the radial outer circumference of the housing collar nut shields the circulation groove.
5. The external circulation ball screw with semi-open type circulation groove of claim 4, wherein a gap is formed between the balls inside the circulation groove and the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211115368.3A CN117739081A (en) | 2022-09-14 | 2022-09-14 | External circulation ball screw with semi-open reflux groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211115368.3A CN117739081A (en) | 2022-09-14 | 2022-09-14 | External circulation ball screw with semi-open reflux groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117739081A true CN117739081A (en) | 2024-03-22 |
Family
ID=90279928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211115368.3A Pending CN117739081A (en) | 2022-09-14 | 2022-09-14 | External circulation ball screw with semi-open reflux groove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117739081A (en) |
-
2022
- 2022-09-14 CN CN202211115368.3A patent/CN117739081A/en active Pending
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