CN116066534A

CN116066534A - Linear feeding transmission pair

Info

Publication number: CN116066534A
Application number: CN202310005240.XA
Authority: CN
Inventors: 王程勇; 蔡建军; 汪东政; 邓卫林
Original assignee: Hubei Sanjiang Aerospace Hongfeng Control Co Ltd
Current assignee: Hubei Sanjiang Aerospace Hongfeng Control Co Ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-05-05

Abstract

The invention discloses a linear feeding transmission pair, which belongs to the technical field of precise transmission and comprises a base, a turbine and a worm rod, wherein the turbine and the worm rod are arranged in the base, a spline shaft which is coaxial with the turbine and is in threaded connection with the turbine is arranged in the base, and the axial rotation of the spline shaft is limited by a limiting assembly, so that the spline shaft can be driven by the turbine to be converted into linear motion along the axial direction. The linear feeding transmission pair has the advantages of simple structure, small volume, high feeding precision, capability of effectively carrying out precise feeding on workpieces, suitability for various servo control systems with high precision requirements, and good development prospect and popularization value.

Description

Linear feeding transmission pair

Technical Field

The invention belongs to the technical field of precise transmission, and particularly relates to a linear feeding transmission pair.

Background

In recent years, with the development of technology, a plurality of working procedures originally completed by manpower are replaced by mechanical equipment in the production industry, so that the production efficiency is improved, and the labor cost is reduced.

At present, mechanical products in China are developing towards high precision, in the production and manufacturing process of the high-precision products, a precise linear feeding transmission device is indispensable, and the feeding precision of the linear feeding transmission device determines the precision of the produced products, so that the influence on the product percent of pass is larger.

The existing linear feeding transmission devices are various, and generally convert rotation into linear movement, such as the most common screw rod transmission pair, but the linear feeding transmission devices cannot meet the requirements of small volume, simple structure and high precision due to complex structure, complicated manufacturing process, large structural deformation and large feeding error.

Disclosure of Invention

In response to one or more of the above-identified deficiencies or improvements in the prior art, the present invention provides a linear feed drive pair that enables precise feeding of a workpiece and ensures the rigidity of the drive pair.

In order to achieve the above object, the present invention provides a linear feed transmission pair, which comprises a base, and a turbine and a worm rod arranged in the base, wherein the turbine is driven by the worm rod; the novel clutch is characterized by also comprising a spline shaft;

the spline shaft and the turbine are coaxially arranged in the base, and a threaded hole is formed in the middle of the turbine along the axial direction, so that one end of the spline shaft is matched with the turbine in a threaded manner; correspondingly, a limiting component is arranged between the other end of the spline shaft and the base to limit the rotation of the spline shaft, so that the rotation of the spline shaft is converted into linear motion along the axial direction under the drive of the turbine.

As a further improvement of the invention, the invention also comprises a spline housing, wherein the spline housing is arranged between the spline shaft and the base and is fixedly connected with the base; the limiting component is arranged between the spline shaft and the spline housing.

As a further improvement of the invention, the limiting assembly comprises a first groove, a second groove and a limiting piece; at least one first groove extending along the axial direction is formed in the inner side of the spline housing, at least one second groove extending along the axial direction is formed in the peripheral wall of one end, deviating from the turbine, of the spline shaft, and the two grooves are matched with each other to form a limit groove; at least one limiting piece is arranged in each limiting groove, the limiting pieces can roll in the limiting grooves, and the height of each limiting piece is larger than the depth of each second groove.

As a further improvement of the invention, the limit component comprises a groove and a lug; at least one groove extending along the axial direction is formed in the peripheral wall, deviating from one end of the turbine, of the spline shaft, and a lug is correspondingly arranged on the inner wall surface of the spline housing and can slide in the groove in a reciprocating manner.

As a further improvement of the invention, the limit component comprises a groove and a lug; at least one groove extending along the axial direction is formed in the inner side wall of the spline housing, a lug is correspondingly arranged on the peripheral wall of one end, deviating from the turbine, of the spline shaft, and the lug can slide in the groove in a reciprocating manner.

As a further improvement of the invention, the first groove and the second groove are V-shaped grooves, and the structural dimensions of the two V-shaped grooves are symmetrically designed.

As a further improvement of the invention, the interference of the limiting piece in the limiting groove is 0.003mm-0.005 mm.

As a further improvement of the invention, the two ends of the limiting groove are respectively provided with a stop piece so as to limit the rolling range of the limiting piece.

As a further improvement of the invention, a plurality of spacing assemblies are arranged between the spline shaft and the spline housing at intervals along the circumferential direction.

As a further improvement of the invention, the hole of the base corresponding to the spline shaft is a through hole, and an end cover is connected with the end part of the through hole, which is close to one end of the turbine, so as to seal one end of the through hole.

The above-mentioned improved technical features can be combined with each other as long as they do not collide with each other.

In general, the above technical solutions conceived by the present invention have the beneficial effects compared with the prior art including:

(1) According to the linear feeding transmission pair, the turbine and the vortex rod are arranged in the base, the turbine drives the spline shaft coaxially connected with the turbine, and the limiting component is arranged at one end of the spline shaft to limit the axial rotation of the spline shaft, so that the spline shaft can be driven by the turbine vortex rod to rotate and be converted into linear motion along the axial direction of the spline shaft.

(2) According to the linear feeding transmission pair, the spline sleeve is arranged between the spline shaft and the base, the limiting groove is correspondingly arranged between the spline shaft and the spline sleeve, and the stop piece is arranged in the limiting groove, so that the spline shaft can be limited in a tangential direction through the stop piece, and the linear movement of the spline shaft is assisted through the rolling of the stop piece in the limiting groove.

(3) According to the linear feeding transmission pair, the plurality of limiting assemblies are arranged between the spline shaft and the spline housing at intervals along the annular direction, so that the shearing load of the spline shaft on each limiting piece is reduced, and the service life of the limiting piece is prolonged; meanwhile, the retainer rings are respectively arranged at the two axial ends of the groove so as to prevent the limiting piece from sliding off in the linear feeding process of the spline shaft; and a certain interference is arranged between the limiting groove and the limiting piece, so that the rigidity of the transmission auxiliary system is ensured.

(4) The linear feeding transmission pair has the advantages of simple structure, small volume, high feeding precision, capability of effectively carrying out precise feeding on workpieces, suitability for various servo control systems with high precision requirements, and good development prospect and popularization value.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of the overall construction of a linear feed drive pair in an embodiment of the present invention;

FIG. 2 is a side view of a linear feed drive pair in an embodiment of the invention;

like reference numerals denote like technical features throughout the drawings, in particular: 1. a spline shaft; 2. a spline housing; 3. a base; 4. steel balls; 5. a scroll rod; 6. a turbine; 7. an end cap; 8. a first bearing; 9. a retainer ring; 10. a motor; 11. v-shaped grooves.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, 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; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Examples:

referring to fig. 1-2, a linear feed transmission pair in a preferred embodiment of the present invention includes a turbine 6, a worm 5, a base 3, a spline shaft 1 and a limiting assembly. The turbine 6 and the worm 5 are arranged in the base 3, and the turbine 6 drives the spline shaft 1 to perform linear motion along the axial direction of the spline shaft.

Specifically, the base 3 in the preferred embodiment is a hollow structure with an orthogonal hole in the middle, providing installation space for assembly of the components. As shown in fig. 1, the orthogonal holes in the preferred embodiment include a horizontal hole continuously extending in the horizontal direction and a vertical hole perpendicular to the horizontal hole and continuously extending, wherein the horizontal hole and the vertical hole communicate with each other in the extending direction of the vertical hole to facilitate connection between the turbine 6 and the scroll 5.

Further, the scroll bar 5 and the turbine 6 in the preferred embodiment are assembled in sequence in the orthogonal holes, and as shown in fig. 1, the scroll bar 5 is placed in the vertical hole and the turbine 6 is placed in the horizontal hole, and the scroll bar 5 is connected with the motor 10, so that the scroll bar 5 can be driven by the motor 10 to rotate and drive the turbine 6 to rotate in the axial direction of the scroll bar.

Further, corresponding to the rotation of the turbine 6 in the base 3, in the preferred embodiment, at least one first bearing 8 is respectively disposed at two axial ends of the turbine 6, and the first bearings 8 are fixedly disposed on the base 3 and sleeved on the turbine 6 to realize the rotational connection between the turbine 6 and the base 3; correspondingly, at least one second bearing is also provided at each axial end of the scroll rod 5 to achieve a rotational connection between the scroll rod 5 and the base 3.

Further, the spline shaft 1 in the preferred embodiment is coaxially arranged in the horizontal hole with the turbine 6, and one end of the spline shaft is connected with the limiting assembly so as to limit the axial rotation of the spline shaft 1; meanwhile, the other end of the spline shaft 1 is in threaded connection with the turbine 6, so that the spline shaft 1 can be driven by the turbine 6 to be converted into linear motion along the axial direction of the spline shaft 1, and linear feeding transmission of workpieces is realized through the spline shaft 1.

Specifically, in the preferred embodiment, a threaded hole is provided in the middle of the turbine 6 in the axial direction corresponding to the thread matching between the turbine 6 and the spline shaft 1, and a thread is provided correspondingly on the outer peripheral wall of the spline shaft 1 near one end of the turbine 6. In actual setting, threads with different tooth shapes, such as rectangular threads, trapezoidal threads, zigzag threads and the like, can be selected according to actual requirements.

Meanwhile, it is preferable to provide the spline shaft 1 as a stepped shaft in which the diameter of the spline shaft 1 near one end of the screw thread is smaller than the diameter of the other end to form an annular step on the outer circumference of the spline shaft 1, so that the linear movement range of the spline shaft 1 is limited by the annular step and the end face of the turbine 6 to stop feeding when the spline shaft 1 moves linearly to the left.

Further, the limiting component in the preferred embodiment is disposed between the base 3 and the spline shaft 1, and is used for limiting the tangential direction of the circumference of the spline shaft 1, so that the spline shaft 1 cannot axially rotate under the driving of the rotation of the turbine 6, and only can drive the spline shaft 1 to axially perform linear motion in a mode of screw thread withdrawing or feeding.

Preferably, a spline housing 2 is further arranged between the spline shaft 1 and the base 3 corresponding to the installation of the limit component, and as shown in fig. 1, the spline housing 2 is sleeved at one end of the spline shaft 1, which is away from the turbine 6, and is fixedly connected with the base 3, and meanwhile, the limit component is arranged between the spline shaft 1 and the spline housing 2.

Specifically, as shown in fig. 1, the spacing assembly in the preferred embodiment includes a first groove, a second groove, and a spacing member. Wherein at least one first groove extending along the axial direction is arranged on the inner side of the spline housing 2; correspondingly, a second groove is correspondingly arranged on the peripheral wall of one end, away from the turbine 6, of the spline shaft 1, so that the first groove and the second groove are matched and combined with each other to form a limit groove; simultaneously, set up at least one locating part in every spacing inslot, and the high degree of depth that is greater than the second recess of this locating part for accessible locating part carries out spacingly to the circumference tangential direction of spline shaft 1, simultaneously, the locating part can roll at the spacing groove, in order to help the rectilinear motion of spline shaft 1, reduces the friction between spline shaft 1 and the spline housing 2.

Preferably, in actual setting, the limiting member may be a ball, a roller, or the like. In the preferred embodiment, steel balls 4 are preferred, and a plurality of limit grooves are further preferred to be uniformly arranged between the spline shaft 1 and the spline housing 2 along the circumferential direction at intervals, and at least three steel balls 4 are placed in each limit groove so as to reduce the shearing load of each steel ball 4 and ensure the rigidity of the limit piece.

When the device is actually arranged, the number of the limit grooves can be selected and determined according to the size of the transmission pair, and the larger the general transmission size is, the more the number of the designed limit grooves is. Meanwhile, the grade of the steel ball 4 is preferably not lower than G5, and the steel ball 4 is ensured to have interference of 0.003mm-0.005mm in the limit groove during assembly, so that the rigidity of the transmission auxiliary system is ensured.

Further, the two ends of the limiting groove are respectively provided with a stop piece so as to limit the rolling range of the limiting piece in the limiting groove and prevent the limiting piece from rolling out of the limiting groove to fall off in the linear feeding process of the spline shaft 1. As shown in fig. 1, in the preferred embodiment, the stopper includes a retainer 9, and annular grooves are provided at both ends of the second groove corresponding to the retainer 9, respectively, and the retainer 9 is placed in the annular grooves to stop the stopper.

It can be understood that when the linear transmission pair is fed from left to right, the retainer ring 9 at the right end should be ensured not to exceed the right end surface of the spline housing 2, so as to ensure that the limiting piece is always in the limiting groove formed by the first groove and the second groove.

In actual setting, a control device can be arranged corresponding to the linear feeding range of the spline shaft 1, so that when the spline shaft 1 is fed rightwards to the position that the retainer ring 9 is flush with the spline housing 2, the motor 10 is controlled to stop driving; accordingly, when the spline shaft 1 comes into contact with the turbine 6 end face at an annular step fed leftward to the outer periphery of the spline shaft 1, the motor 10 is controlled to stop driving.

Further, in the preferred embodiment, the limiting groove has a diamond-shaped cross section, as shown in fig. 2, that is, the first groove and the second groove are both V-shaped grooves 11, and the structural dimensions of the two V-shaped grooves 11 are preferably designed symmetrically, so as to ensure that the limiting member can be stressed uniformly when the spline shaft 1 moves linearly.

In order to improve the matching precision of the V-shaped groove 11 between the spline shaft 1 and the spline housing 2 in actual setting, during part machining, the two parts are preferably subjected to finish machining forming in an integrated forming mode, and an integral workpiece is cut into two parts of the spline shaft 1 and the spline housing 2 in a later stage by adopting a precise cutting process method, so that the V-shaped groove 11 can be formed in perfect matching during actual installation, and the phenomenon that a limiting part cannot roll normally in the V-shaped groove 11 due to the error of machining precision is prevented.

Further, in another embodiment, it is preferable that the limiting assembly includes a groove and a projection, so that the limiting assembly is configured as a tangential limiting form of the groove-projection, limiting the spline shaft 1 in a circumferential tangential direction by the projection, and the groove is configured along a linear movement direction of the spline shaft 1, so that the projection can slide in the groove.

Preferably, at least one axially extending groove may be provided in the peripheral wall of the end of the spline shaft 1 facing away from the turbine 6, and a projection may be provided on the inner wall surface of the spline housing 2, and the projection may reciprocate in the groove. Of course, it is also possible to provide at least one axially extending groove on the inner side wall of the spline housing 2, and correspondingly provide a projection on the outer peripheral wall of the end of the spline shaft 1 facing away from the turbine 6, and the projection can reciprocate in the groove. In actual arrangement, a plurality of grooves-protrusions may be provided between the spline shaft 1 and the spline housing 2 at intervals in the circumferential direction, so as to reduce shearing action of the spline shaft 1 on each protrusion.

Further, in order to facilitate the installation and connection of the mechanisms, the horizontal hole in the base 3 is provided as a through hole in the preferred embodiment, and an end cover 7 is provided at the end of the through hole near one end of the turbine 6 in connection therewith, so as to seal one end of the through hole after the installation of the mechanisms is completed.

It can be appreciated that in order to facilitate the connection and installation between the spline shaft 1 and the device to be fed, a mounting hole is provided at one end of the spline shaft 1 facing away from the turbine 6; meanwhile, one end of the spline shaft 1, which is close to the turbine 6, can be provided with a hollow structure so as to reduce the overall weight of the transmission pair.

The linear feeding transmission pair has the advantages of simple structure, small volume, high feeding precision, capability of effectively carrying out precise feeding on workpieces, suitability for various servo control systems with high precision requirements, and good development prospect and popularization value.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. A linear feed transmission pair, comprising a base, and a turbine and a worm rod which are arranged in the base, wherein the turbine is driven by the worm rod; the novel clutch is characterized by also comprising a spline shaft;

2. The linear feed transmission pair of claim 1, further comprising a spline housing disposed between the spline shaft and the base and fixedly connected thereto; the limiting component is arranged between the spline shaft and the spline housing.

3. The linear feed drive pair of claim 2, wherein the limit assembly comprises a first groove, a second groove, and a limit;

at least one first groove extending along the axial direction is formed in the inner side of the spline housing, at least one second groove extending along the axial direction is formed in the peripheral wall of one end, deviating from the turbine, of the spline shaft, and the two grooves are matched with each other to form a limit groove; at least one limiting piece is arranged in each limiting groove, the limiting pieces can roll in the limiting grooves, and the height of each limiting piece is larger than the depth of each second groove.

4. The linear feed drive pair of claim 2, wherein the limit assembly comprises a groove and a projection; at least one groove extending along the axial direction is formed in the peripheral wall, deviating from one end of the turbine, of the spline shaft, and a lug is correspondingly arranged on the inner wall surface of the spline housing and can slide in the groove in a reciprocating manner.

5. The linear feed drive pair of claim 2, wherein the limit assembly comprises a groove and a projection; at least one groove extending along the axial direction is formed in the inner side wall of the spline housing, a lug is correspondingly arranged on the peripheral wall of one end, deviating from the turbine, of the spline shaft, and the lug can slide in the groove in a reciprocating manner.

6. A linear feed transmission pair according to claim 3, wherein the first and second grooves are V-grooves, and the structural dimensions of both V-grooves are symmetrically designed.

7. The linear feed transmission pair of claim 3 or 6, wherein the interference of the limiting piece in the limiting groove is 0.003mm-0.005 mm.

8. The linear feed transmission pair according to claim 7, wherein stopper pieces are provided at both ends of the stopper groove, respectively, to limit a rolling range of the stopper pieces.

9. The linear feed transmission pair according to any one of claims 1 to 6 and 8, wherein a plurality of limit components are arranged between the spline shaft and the spline housing at intervals in the circumferential direction.

10. The linear feed transmission pair according to claim 9, wherein the hole of the base corresponding to the spline shaft is a through hole, and an end cover is connected to an end of the through hole near one end of the turbine so as to seal one end of the through hole.