CN219062349U - Screw nut connecting assembly and screw transmission device - Google Patents
Screw nut connecting assembly and screw transmission device Download PDFInfo
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- CN219062349U CN219062349U CN202223281501.0U CN202223281501U CN219062349U CN 219062349 U CN219062349 U CN 219062349U CN 202223281501 U CN202223281501 U CN 202223281501U CN 219062349 U CN219062349 U CN 219062349U
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Abstract
The embodiment of the application provides a lead screw nut coupling assembling and lead screw transmission, and lead screw nut coupling assembling includes: the nut seat and the decoupling piece, the nut seat includes the bottom and the connecting portion of following the connection along first direction, and the bottom is used for being connected with the lead screw nut, and the orthographic projection of connecting portion along first direction in the bottom falls into the bottom scope. The decoupling piece is sleeved on the nut seat, the decoupling piece is provided with a connecting hole formed in the thickness direction of the decoupling piece in a penetrating mode and a plurality of side walls surrounding the connecting hole, the decoupling piece is sleeved on the connecting portion through the connecting hole, and the thickness direction of the decoupling piece is parallel to the first direction. The orthographic projection of the connecting portion along the first direction falls into the range of the connecting hole, and the thickness of the decoupling piece is smaller than that of the connecting portion in the first direction. The decoupling piece of the screw nut connecting assembly can move in the first direction, can absorb the position change of the screw nut in the first direction, is simple and compact in structure, small in occupied space, small in idle stroke and small in influence on transmission precision.
Description
Technical Field
The application relates to the technical field of transmission components, in particular to a screw nut connecting assembly and a screw transmission device.
Background
The screw transmission device is a transmission device capable of converting rotary motion into linear motion, and is widely applied in the field of automation. When the screw transmission device is used, the screw nut and the connected piece are generally required to be fixedly connected, so that the connected piece can move along with the screw nut. The existing connection mode of the screw nut and the connected piece mainly comprises two hard connection and decoupling connection, wherein the hard connection is to completely lock the screw nut and the connected piece through a screw, and the connection mode has high requirements on the machining precision and the assembly precision of related parts and is not beneficial to reducing the cost.
The decoupling connection is an incompletely fixed connection mode, so that a certain movement clearance is allowed between the screw nut and the connected piece, and the position change of the screw nut can be absorbed. The decoupling connection has lower requirements on the machining precision and the assembly precision of related parts than hard connection, but the existing decoupling connection mode has complex structure, large occupied space and larger influence on the transmission precision, and is difficult to meet the use requirements of application occasions with higher transmission precision requirements.
Disclosure of Invention
The embodiment of the application provides a lead screw nut coupling assembling and lead screw transmission, simple structure is compact, reduces the influence of transmission precision when can absorbing the position variation of lead screw nut.
In a first aspect, embodiments of the present application provide a lead screw nut connection assembly, comprising: the nut seat and the decoupling piece, the nut seat includes the bottom and the connecting portion of following the connection along first direction, and the bottom is used for being connected with the lead screw nut, and the orthographic projection of connecting portion along first direction in the bottom falls into the bottom scope. The decoupling piece is sleeved on the nut seat, the decoupling piece is provided with a connecting hole formed in the thickness direction of the decoupling piece in a penetrating mode and a side wall surrounding the connecting hole, the decoupling piece is sleeved on the connecting portion through the connecting hole, and the thickness direction of the decoupling piece is parallel to the first direction. The orthographic projection of the connecting portion along the first direction falls into the range of the connecting hole, and the thickness of the decoupling piece is smaller than that of the connecting portion in the first direction.
In some embodiments, the orthographic projection of the connecting portion along the first direction is a first projection, the shape of the first projection is a first polygon, the orthographic projection of the connecting hole along the first direction is a second projection, and the shape of the second projection is a second polygon.
In some embodiments, the area of the first polygon is smaller than the area of the second polygon, and the first polygon and the second polygon are both equilateral polygons.
In some embodiments, the first polygon is an equilateral hexagon and the second polygon is an equilateral hexagon.
In some embodiments, the connection hole further includes a recess formed by recessing the junction of the adjacent sidewalls toward the outer surface.
In some embodiments, the decoupling member further comprises a first fixing portion disposed on the decoupling member for connecting the connected member to the lead screw nut.
In some embodiments, the connecting assembly further comprises a pressing plate disposed on a side of the decoupling member away from the bottom and fixedly connected with the connecting portion, wherein the pressing plate is used for preventing the decoupling member from being separated from the connecting portion.
In some embodiments, a second fixing portion is disposed at an end of the connecting portion away from the bottom, a third fixing portion is disposed at a position corresponding to the second fixing portion on the pressing plate, and the pressing plate is fixedly connected to the connecting portion through the second fixing portion and the third fixing portion.
In a second aspect, embodiments of the present application also provide a screw drive, comprising: the screw rod, the screw rod nut and the connecting component in the embodiment are sleeved on the screw rod, and the connecting component is fixedly connected to the screw rod nut.
In some embodiments, the screw driving device further comprises a fixing seat and a supporting seat which are respectively arranged at two ends of the screw rod, wherein the fixing seat and the supporting seat are used for fixing the screw rod driving device.
The screw nut coupling assembling that this embodiment provided, including nut seat and decoupling piece, the decoupling piece cup joints in the connecting portion of nut seat through its connecting hole, because the connecting portion of nut seat is along the orthographic projection of first direction in the connecting hole scope of decoupling piece, the connecting hole of decoupling piece has the clearance with the connecting portion, can absorb the position change that screw nut radially produced at self, simultaneously, because the thickness of decoupling piece in first direction is less than the thickness of the connecting portion of nut seat, the decoupling piece can remove in first direction, can absorb the position change of screw nut in first direction. In addition, as the decoupling piece in the screw nut connecting component is sleeved on the connecting part of the nut seat, the screw nut connecting component is simple and compact in structure, small in occupied space and small in idle stroke, and therefore the influence on transmission precision is small.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective exploded view of a first view of a lead screw nut connection assembly provided in some embodiments of the present application;
FIG. 2 is a schematic perspective exploded view of the screw nut connection assembly of FIG. 1 from a second perspective;
FIG. 3 is a schematic perspective view of a screw drive provided in some embodiments of the present application;
FIG. 4 is a schematic cross-sectional view of the screw drive provided in FIG. 3 along the X-direction;
FIG. 5 is a schematic front view of the screw drive provided in FIG. 3 in the Y-direction;
FIG. 6 is a schematic cross-sectional view of the screw drive provided in FIG. 5 along A-A;
FIG. 7 is a schematic front view in the Y-direction of a screw drive provided in some embodiments of the present application when actually installed;
FIG. 8 is an enlarged schematic view of the structure at B in FIG. 7;
FIG. 9 is a schematic front view in the Z-direction of a screw drive provided in some embodiments of the present application when actually installed;
FIG. 10 is an enlarged schematic view of the structure at C in FIG. 9;
fig. 11 is a schematic illustration of extreme positions of a lead screw nut connection assembly provided in some embodiments of the present application.
In the accompanying drawings:
a lead screw nut connection assembly 100; a screw drive 200;
a pressing plate 110; a third fixing portion 111; a decoupling member 120; a connection hole 121; a first fixing portion 122; a recess 123; a nut seat 130; a bottom 131; a connection portion 132; a second fixing portion 133;
a fixing base 201; a lead screw nut 202; a lead screw 203; a support base 204.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
The screw transmission device is a transmission device capable of converting rotary motion into linear motion, and is widely applied in the field of automation. The screw transmission device mainly comprises a ball screw and a trapezoidal screw, and the ball screw has the characteristics of high transmission efficiency, high precision, low friction coefficient, low noise, reversible motion and the like; the trapezoidal screw has the characteristics of large load, self-locking and the like.
In actual life, when the screw transmission device is used, the screw nut is often required to be fixedly connected with the connected piece, so that the connected piece can move along with the screw nut. The existing connection mode of the screw nut and the connected piece mainly comprises hard connection and decoupling connection, and the hard connection is to completely lock the screw nut and the connected piece through a screw. Because in actual use, the screw transmission device is usually matched with the linear guide rail together, the sliding block of the linear guide rail and the screw nut are connected with the connected piece, and the movement precision of the linear guide rail and the screw is very high, so that in order to ensure smooth movement and reduce abrasion, the screw axis and the linear guide rail are required to have higher parallelism, and the screw nut and the connected piece are connected in a hard connection mode, so that the requirements on the processing precision and the assembly precision of related parts are higher, and the cost is not beneficial to reduction.
The decoupling connection is an incompletely fixed connection mode, a certain movement clearance is allowed between the screw nut and the connected piece by the connection mode, and when the screw shaft is inclined or deformed in the radial direction, the screw nut can change positions along with the screw, so that the problems of aggravation of abrasion and influence on accuracy caused by uneven stress are avoided. However, although the requirements on the machining precision and the assembly precision of related parts are lower than those of hard connection, the conventional decoupling connection has larger influence on the transmission precision, and is difficult to meet the use requirements of application occasions with higher transmission precision requirements.
In order to solve the above problems, embodiments of the present application provide a lead screw nut connection assembly and a lead screw transmission device, which can absorb the position change of a lead screw nut and reduce the influence on transmission accuracy. Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic perspective exploded view of a first view of a lead screw nut connection assembly provided in some embodiments of the present application; FIG. 2 is a schematic perspective exploded view of the screw nut connection assembly of FIG. 1 from a second perspective; FIG. 3 is a schematic perspective view of a screw drive provided in some embodiments of the present application; fig. 4 is a schematic cross-sectional structure of the screw driving device provided in fig. 3 along the X-direction.
As shown in fig. 1 to 4, the lead screw nut connection assembly 100 may include a nut seat 130 and a decoupling member 120, and the decoupling member 120 is sleeved on the nut seat 130. The nut seat 130 includes a bottom 131 and a connecting portion 132 sequentially connected in a first direction (shown as X direction in the drawing), an orthographic projection of the connecting portion 132 on the bottom 131 in the first direction (shown as X direction in the drawing) falls within a range of the bottom 131, and the bottom 131 is fixedly connected with the lead screw nut 202. The decoupling member 120 is provided with a connecting hole 121 formed through the decoupling member in the thickness direction thereof and a sidewall surrounding the connecting hole 121, and the decoupling member 120 is sleeved on the connecting portion 132 through the connecting hole 121. As shown in fig. 5, the thickness direction of the decoupling member 120 is parallel to the first direction (X direction in the drawing), and the connection portion 132 is projected in front of the first direction (X direction in the drawing)Falling within the range of the connection hole 121 and in a first direction (as shown by the X direction in the drawing), the thickness L of the decoupling member 120 1 Less than the thickness L of the connecting portion 132 2 。
The lead screw nut connecting assembly 100 provided by the embodiment of the application comprises a nut seat 130 and a decoupling piece 120, wherein the decoupling piece 120 is sleeved on a connecting portion 132 of the nut seat 130 through a connecting hole 121 of the decoupling piece, and the decoupling piece 120 can move in a first direction (shown as an X direction in the drawing) due to the fact that the orthographic projection of the connecting portion 132 of the nut seat 130 along the first direction (shown as the X direction in the drawing) is within the range of the connecting hole 121 of the decoupling piece 120, namely, a gap exists between the connecting hole 121 of the decoupling piece 120 and the connecting portion 132, so that the position change of the lead screw nut 202 in the radial direction can be absorbed, and meanwhile, the thickness of the decoupling piece 120 in the first direction (shown as the X direction in the drawing) is smaller than the thickness of the connecting portion 132 of the nut seat 130, so that the position change of the lead screw nut 202 in the first direction (shown as the X direction in the drawing) can be absorbed. In addition, in the screw nut connecting assembly 100 of the embodiment of the present application, the decoupling piece 120 is sleeved on the connecting portion 132 of the nut seat 130, so that the structure is simple and compact, the occupied space is small, and the idle stroke is small due to the small gap between the decoupling piece 120 and the connecting portion 132, so that the influence on the transmission precision is small.
In some embodiments, for ease of transmission, the front projection of the connecting portion 132 along the first direction (as shown in the X direction in the drawing) is a first projection, the shape of the first projection is a first polygon, and the front projection of the connecting hole 121 along the first direction (as shown in the X direction in the drawing) is a second projection. As an example, the number of sides of the first polygon and the second polygon may be equal, e.g., the first polygon and the second polygon are each a square, pentagon, hexagon, or other polygon.
The area of the first polygon is smaller than that of the second polygon, and the first polygon and the second polygon are equilateral polygons. For example, if the number of sides of the first polygon and the second polygon is an even number, as shown in fig. 6, the first polygon and the second polygon are equilateral hexagons, and the vertical distance H between opposite sides of the first polygon 1 Less than the vertical distance between opposite sides of the second polygonH 2 The method comprises the steps of carrying out a first treatment on the surface of the If the number of sides of the first polygon and the second polygon is an odd number, such as an equilateral pentagon, the distance between any one vertex of the first polygon and the side opposite to the vertex is smaller than the distance between any one vertex of the second polygon and the side opposite to the vertex.
In some embodiments, to increase the utilization of the material and further reduce the cost, the first polygon is an equilateral hexagon and the second polygon is an equilateral hexagon.
As shown in fig. 6, in some embodiments, to prevent stress concentration, the connection hole 121 further includes a recess 123, and the recess 123 is formed to be recessed toward the outer surface for the connection of the adjacent sidewalls.
In some embodiments, the decoupling member 120 can further include a first securing portion 122, the first securing portion 122 disposed on the decoupling member 120 for connecting the connected member to the lead screw nut 202.
In some embodiments, the lead screw nut connection assembly 100 may further include a pressing plate 110, where the pressing plate 110 is disposed on a side of the decoupling member 120 away from the bottom 131 and is fixedly connected with the connection portion 132, and the pressing plate 110 is used to prevent the decoupling member 120 from being separated from the connection portion 132.
The connecting portion 132 is provided with a second fixing portion 133 at an end far from the bottom 131, the pressing plate 110 is provided with a third fixing portion 111 at a position corresponding to the second fixing portion 133, and the pressing plate 110 is fixedly connected to the connecting portion 132 through the second fixing portion 133 and the third fixing portion 111.
For ease of understanding, the screw-nut connection assembly 100 provided in this embodiment of the present application will be described in detail below with reference to the accompanying drawings, in which the screw-nut connection assembly 100 is used in conjunction with a linear guide, and the first polygon and the second polygon of the screw-nut connection assembly 100 are equilateral hexagons.
As shown in fig. 7 and 8, when the axial center of the screw 203 of the screw transmission device 200 has an angle deviation α from the actual installation plane, the distance H between the axial center of the screw 203 and the installation surface of the connected member (not shown) will change during the linear motion of the screw nut 202 along the screw 203, and accordingly, the connected member is fixedly connected with the decoupling member 120In addition, the axis of the decoupling member 120 and the axis of the screw 203 will also generate a relative displacement along the Z direction, wherein the Z direction is perpendicular to the X direction. However, since there is a gap Δz=h in the Z direction between the decoupling member 120 and the connection portion 132 of the nut seat 130 2 -H 1 The relative displacement between the axis of the decoupling piece 120 and the axis of the screw 203 along the Z direction can be absorbed, so as to avoid interference between the decoupling piece 120 and the nut seat 130 caused by the relative displacement between the axis of the decoupling piece 120 and the axis of the screw 203 along the Z direction; meanwhile, since the axis of the screw 203 has an angle deviation α from the ideal installation plane, the decoupling member 120 also has an angle deviation α with respect to the nut seat 130, but since the thickness of the decoupling member 120 in the first direction (as shown in the X direction in the drawing) is smaller than the thickness of the connecting portion 132 of the nut seat 130, i.e., there is a gap Δx=l between the decoupling member 120 and the connecting portion 132 of the nut seat 130 along the X direction 2 -L 1 The angular deviation a of the decoupling member 120 and with respect to the nut seat 130 can be absorbed, so that interference of the decoupling member 120 with the nut seat 130 due to the angular deviation a of the decoupling member 120 and with respect to the nut seat 130 is avoided.
As shown in fig. 9 and 10, when there is an angle deviation β between the axis of the screw 203 and the direction of movement of the linear guide rail (not shown in the drawings), the distance between the axis of the screw 203 and the linear guide rail will change during the linear movement of the screw nut 202 along the screw 203, and accordingly, the axis of the decoupling member 120 will generate a relative displacement along the Y direction with respect to the axis of the screw 203 due to the fixed connection between the coupled member and the decoupling member 120, wherein the Y direction is perpendicular to the X direction and the Z direction. However, since there is a gap Δz=h in the Z direction between the decoupling member 120 and the connection portion 132 of the nut seat 130 2 -H 1 The relative displacement along the Y direction generated by the axis of the decoupling member 120 and the axis of the lead screw 203 can be absorbed; meanwhile, because the axis of the lead screw 203 has an angle deviation β with the movement direction of the linear guide rail, the decoupling piece 120 also has an angle deviation β with respect to the pressing plate 110, but because the decoupling piece 120 and the nut seat 130 have a gap Δy=Δz/sin60 ° along the Y direction, the angle deviation β of the decoupling piece 120 with respect to the pressing plate 110 can be absorbed, thereby avoiding the interference between the decoupling piece 120 and the pressing plate 110.
As shown in fig. 11, since there is a gap Δy=Δz/sin60 ° between the decoupling member 120 and the nut seat 130 in the Y direction, the nut seat 130 has a free stroke swing angle
Due to the gap Δx=l between the decoupling piece 120 and the nut seat 130 2 -L 1 The nut seat 130 has an idle stroke movement amount Δx=A-A. Therefore, when the pitch of the lead screw 203 is S, the maximum transmission error η of the lead screw nut connection assembly 100 in the X direction max = (θ/pi) ×s+Δx. Therefore, since the embodiment of the present application can reduce the idle stroke swing angle θ thereof by reducing the clearance Δz, the influence on the transmission error can be reduced. In addition, the decoupling piece 120 of the screw nut connecting assembly 100 is sleeved on the connecting portion 132 of the nut seat 130, so that the screw nut connecting assembly is simple in structure and small in occupied space.
The present embodiments also provide a screw drive 200, which includes: the lead screw 203, the lead screw nut 202 and the connecting assembly in the above embodiment, the lead screw nut 202 is sleeved on the lead screw 203, and the connecting assembly is fixedly connected to the lead screw nut 202.
In some embodiments, the screw driving device further comprises a fixing seat 201 and a supporting seat 204 respectively arranged at two ends of the screw 203, wherein the fixing seat 201 and the supporting seat 204 are used for fixing the screw driving device 200.
In the foregoing, only the specific embodiments of the present application are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, which are intended to be included in the scope of the present application.
Claims (10)
1. A lead screw nut connection assembly, the connection assembly comprising:
the nut seat comprises a bottom and a connecting part which are sequentially connected along a first direction, wherein the bottom is used for being connected with a screw nut, and the orthographic projection of the connecting part on the bottom along the first direction falls into the bottom range;
the decoupling piece is sleeved on the nut seat, a connecting hole penetrating in the thickness direction of the decoupling piece and a side wall surrounding the connecting hole are formed in the decoupling piece, the decoupling piece is sleeved on the connecting part through the connecting hole, and the thickness direction of the decoupling piece is parallel to the first direction;
the orthographic projection of the connecting portion along the first direction falls into the range of the connecting hole, and the thickness of the decoupling piece in the first direction is smaller than that of the connecting portion.
2. The connection assembly of claim 1, wherein an orthographic projection of the connection portion along the first direction is a first projection, the first projection is shaped as a first polygon, an orthographic projection of the connection hole along the first direction is a second projection, and the second projection is shaped as a second polygon.
3. The connection assembly of claim 2, wherein the first polygon has an area smaller than an area of the second polygon, and wherein the first polygon and the second polygon are equilateral polygons.
4. The connection assembly of claim 2, wherein the first polygon is an equilateral hexagon and the second polygon is an equilateral hexagon.
5. The connection assembly of claim 1, wherein the connection hole further comprises a recess formed by recessing a junction of adjacent sidewalls toward an outer surface.
6. The connection assembly of claim 1, wherein the decoupling member further comprises a first securing portion disposed on the decoupling member for connecting the connected member to the lead screw nut.
7. The connection assembly of claim 1, further comprising a pressure plate disposed on a side of the decoupling member remote from the bottom and fixedly connected to the connection portion, the pressure plate configured to prevent the decoupling member from being pulled out of the connection portion.
8. The connecting assembly according to claim 7, wherein a second fixing portion is provided at an end of the connecting portion away from the bottom portion, a third fixing portion is provided at a position corresponding to the second fixing portion on the pressing plate, and the pressing plate is fixedly connected to the connecting portion through the second fixing portion and the third fixing portion.
9. A screw drive, comprising: a screw, a screw nut and a connection assembly according to any one of claims 1 to 8; the screw nut is sleeved on the screw; the connecting component is fixedly connected to the screw nut.
10. The screw drive of claim 9, further comprising a fixing base and a supporting base respectively disposed at two ends of the screw, the fixing base and the supporting base being used for fixing the screw drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223281501.0U CN219062349U (en) | 2022-12-07 | 2022-12-07 | Screw nut connecting assembly and screw transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223281501.0U CN219062349U (en) | 2022-12-07 | 2022-12-07 | Screw nut connecting assembly and screw transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219062349U true CN219062349U (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223281501.0U Active CN219062349U (en) | 2022-12-07 | 2022-12-07 | Screw nut connecting assembly and screw transmission device |
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| Country | Link |
|---|---|
| CN (1) | CN219062349U (en) |
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2022
- 2022-12-07 CN CN202223281501.0U patent/CN219062349U/en active Active
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