CN212564278U - Planetary roller screw with involute thread profile - Google Patents
Planetary roller screw with involute thread profile Download PDFInfo
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- CN212564278U CN212564278U CN202020542354.XU CN202020542354U CN212564278U CN 212564278 U CN212564278 U CN 212564278U CN 202020542354 U CN202020542354 U CN 202020542354U CN 212564278 U CN212564278 U CN 212564278U
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Abstract
The utility model relates to a planet roller lead screw with thread profile of gradually bursting at seams, including lead screw, nut, roller, be connected through the roller transmission between lead screw and the nut, and be transmission threaded connection between roller and lead screw, the nut, have at least one in the transmission thread profile of lead screw, nut, roller for the profile of gradually bursting at seams, all the other sharp profiles of being. The thread axial profile of the transmission thread profile consists of two symmetrically distributed involutes, and an included angle formed by tangents of the two involutes at the pitch diameter of the thread is a thread profile angle alpha of the thread. Combine together the parameter that will gradually burst into the seams and the thread parameter of required design, establish the thread profile that gradually bursts into the seams that is applied to planet roller lead screw that obtains through this utility model will be superior to current circular arc profile meshing mode in the meshing characteristic, can effectually avoid the instability of meshing and because of the bearing capacity decline scheduling problem that the meshing point changes and leads to, improve the stability that planet roller lead screw bore by a wide margin.
Description
Technical Field
The utility model relates to a planet roller lead screw, especially a but heavily loaded high-speed transmission planet roller lead screw with rotary motion transformation linear motion's planet screw drive mechanism.
Background
Compared with a ball screw, the roller screw has the characteristics of stronger bearing capacity, higher speed, higher precision, longer service life, low maintenance cost and the like, thereby becoming one of the most critical basic parts in precision mechanical equipment such as aviation machinery, numerical control machines, precision instruments, meters and the like and being widely applied.
As shown in fig. 1, the planetary roller screw includes a screw 1, a nut 3, rollers 4, an inner gear ring 2, a planet carrier 5, a retainer ring 6, and the like. The planetary roller screw can be divided into three types, namely a standard type, a nut type and a circulating type according to the relative movement form among the rollers, the nut and the screw in the transmission process, wherein the standard type rollers and the nut are axially kept relatively static, the nut type rollers and the screw are axially kept relatively static, and the circulating type rollers move back and forth relative to the nut in an axial periodic mode.
In the specific movement process, the roller threads are respectively meshed with the screw threads of the lead screw and the nut threads to transmit power. When the screw rod rotates, the nut moves along the axis of the screw rod, and the rollers rotate and do planetary motion around the screw rod at the same time, and the axial moving speed of the rollers is kept the same as that of the nut. The rotational motion is converted into a linear motion by the above-mentioned motion.
During the transmission, the thread contact points of the plane profile are many, but the diameter of the contact point of the roller and the screw (nut) can not be kept constant. In order to obtain a precise lead, which must ensure stability and accuracy of the thread contact points, the thread profiles of the rollers and the screw (nut) should have at least one curved surface. In the conventional design, the screw 1 and the nut 3 are triangular threads having the same number of threads, and the normal (axial) profile is a straight line; whereas the rollers 4 are generally single-start threads with a normal (axial) profile in the form of a circular arc R. The profile angle a of the thread is typically 90, as shown in particular in fig. 2(a), (b), (c). A conventional roller screw nut engagement is shown in fig. 3. In the planetary roller screw, the curvature radius of the circular arc R is fixed for the thread, which brings that under the condition of a specific thread pitch and specification, the meshing point is very close to the edge, so that the bearing capacity is reduced, and even the transmission is failed.
SUMMERY OF THE UTILITY MODEL
In order to reduce the problem that the thread engagement causes a reduction in the load-bearing capacity at the edges during engagement. The utility model provides a planet roller lead screw with thread profile that gradually bursts at seams, in this planet roller lead screw, the profile of thread comprises gradually bursting at the seams, because the curvature radius that gradually bursts at the seams changes, it is big in the regional curvature radius of crest bottom, when the meshing point of avoiding that the meshing process can be effective is very close to the edge, lead to bearing capacity to descend, the problem of transmission inefficacy even, and because the change of curvature radius makes this planet roller lead screw at the meshing in-process, the meshing point is further fixed near the well footpath of screw thread, avoid meshing in the edge at the effective end.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a planet roller lead screw with thread profile of gradually bursting at seams, includes lead screw, nut, roller, is connected through the roller transmission between lead screw and the nut, and is transmission threaded connection between roller and lead screw, the nut, at least one in the transmission thread profile of lead screw, nut, roller is the profile of gradually bursting at seams, and the rest is the straight line profile.
Furthermore, the thread axial profile of the transmission thread profile consists of two symmetrically distributed involutes, and an included angle formed by tangents of the two involutes at the pitch diameter of the thread is a thread profile angle alpha of the thread.
Furthermore, the screw rod and the nut have threads with the same number of heads, and the axial tooth profile of the threads is a straight line; and the roller is a single-head thread, and the axial profile is an involute.
Furthermore, the screw rod and the nut are provided with threads with the same number of heads, and the axial tooth profile of the threads is an involute; and the roller is a single-head thread, and the axial profile is an involute or a straight line.
Furthermore, the screw rod and the nut are provided with threads with the same number of heads, the axial tooth profile of the screw rod is an involute, and the axial tooth profile of the nut is a straight line; and the roller is a single-head thread, and the axial profile is an involute.
Furthermore, the screw rod and the nut are provided with threads with the same number of heads, the axial tooth profile of the screw rod is a straight line, and the axial tooth profile of the nut is an involute; and the roller is a single-head thread, and the axial profile is an involute.
The utility model has the advantages that:
the utility model provides a planetary roller lead screw of new screw thread profile, the thread profile through design roller is for gradually bursting at the seams, and the thread profile of lead screw and nut is for sharp or the realization that gradually bursts at the seams. And combining the parameters of the involute with the parameters of the thread required to be designed to establish the involute thread profile applied to the planetary roller screw. Through the utility model discloses the planet roller lead screw that obtains will be superior to current circular arc profile of tooth meshing mode in the meshing characteristic, can effectually avoid the instability of meshing and because of the bearing capacity decline scheduling problem that the meshing point changes and leads to. The stability of the planet roller screw bearing is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a prior art planetary roller screw assembly;
FIG. 2 is a prior art planetary roller screw profile;
wherein: (a) a roller, (b) a nut, (c) a screw;
FIG. 3 is a diagram of the engagement of a roller, a nut and a screw in a conventional planetary roller screw;
fig. 4 is the involute thread profile of the present invention;
FIG. 5 is an axial profile view;
FIG. 6 is a normal profile view;
fig. 7 is the engagement diagram of the involute profile roller, the nut and the lead screw of the utility model.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in fig. 4 to 7, the utility model provides a planetary roller screw with involute thread profile, including lead screw 1, nut 3, roller 4, be connected through roller 4 transmission between lead screw 1 and the nut 3, and be transmission threaded connection between roller 4 and lead screw 1, the nut 3. At least one of the transmission thread profiles of the screw rod 1, the nut 3 and the roller 4 is an involute profile, and the rest are linear profiles.
As shown in fig. 4, the thread normal (axial) profile of the drive thread profile consists of two symmetrically distributed involute curves J, and the included angle formed by tangent lines of the two involute curves J at the pitch diameter of the thread is the thread profile angle α of the thread. The radius of curvature at any point on the involute profile increases as the point moves toward the crest. The involute profile curve is related to geometric parameters such as pitch and pitch of the thread.
The thread profile can be used for the threads of screws, nuts and rollers, and in particular, the profile can be a normal or axial profile, i.e., a profile formed by the intersection of a plane of the helix axis and the thread, as shown in fig. 5. The normal profile indicates a profile formed by intersecting a plane perpendicular to the spiral line direction with the screw thread, as shown in fig. 6. The meshed relation among the roller 4, the screw rod 1 and the nut 3 is shown in fig. 7 by applying an involute tooth form, and the specific implementation form can be that (1) the screw rod 1 and the nut 3 are threads with the same number of heads, and the normal (axial) tooth profile is a straight line L; and the roller 4 is a single-end thread, and the normal (axial) profile is an involute J. (2) The screw rod 1 and the nut 3 are threads with the same number of heads, and the normal (axial) tooth profile is an involute J; and the roller 4 is a single-end thread, and the normal (axial) profile is an involute J or a straight line L. (3) The screw rod 1 and the nut 3 are threads with the same number of heads, the normal (axial) tooth profile of the screw rod 1 is an involute J, and the normal (axial) tooth profile of the nut 3 is a straight line L; and the roller 4 is a single-end thread, and the normal (axial) profile is an involute J. (4) The screw rod 1 and the nut 3 are threads with the same number of heads, the normal (axial) tooth profile of the screw rod 1 is a straight line L, and the normal (axial) tooth profile of the nut 3 is an involute J; and the roller 4 is a single-end thread, and the normal (axial) profile is an involute J.
The present invention is not limited to the above-mentioned examples, and various modifications and changes which can be made by those skilled in the art without creative work are protected by the present invention within the scope defined by the claims of the present invention.
Claims (6)
1. The utility model provides a planet roller lead screw with involute thread profile, includes lead screw, nut, roller, is connected through the roller transmission between lead screw and the nut, and is transmission threaded connection between roller and lead screw, the nut, its characterized in that: at least one of the transmission thread profiles of the screw rod, the nut and the roller is an involute profile, and the rest of the transmission thread profiles are linear profiles.
2. A planetary roller screw having an involute thread profile as in claim 1 wherein: the thread axial profile of the transmission thread profile consists of two symmetrically distributed involutes, and an included angle formed by tangents of the two involutes at the pitch diameter of the thread is a thread profile angle alpha of the thread.
3. A planetary roller screw having an involute thread profile as in claim 1 wherein: the screw rod and the nut are provided with threads with the same number of heads, and the axial tooth profile of the threads is a straight line; and the roller is a single-head thread, and the axial profile is an involute.
4. A planetary roller screw having an involute thread profile as in claim 1 wherein: the screw rod and the nut are provided with threads with the same number of heads, and the axial tooth profile of the threads is an involute; and the roller is a single-head thread, and the axial profile is an involute or a straight line.
5. A planetary roller screw having an involute thread profile as in claim 1 wherein: the screw rod and the nut are provided with threads with the same number of heads, the axial tooth profile of the screw rod is an involute, and the axial tooth profile of the nut is a straight line; and the roller is a single-head thread, and the axial profile is an involute.
6. A planetary roller screw having an involute thread profile as in claim 1 wherein: the screw rod and the nut are provided with threads with the same number of heads, the axial tooth profile of the screw rod is a straight line, and the axial tooth profile of the nut is an involute; and the roller is a single-head thread, and the axial profile is an involute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020542354.XU CN212564278U (en) | 2020-04-13 | 2020-04-13 | Planetary roller screw with involute thread profile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020542354.XU CN212564278U (en) | 2020-04-13 | 2020-04-13 | Planetary roller screw with involute thread profile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212564278U true CN212564278U (en) | 2021-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020542354.XU Active CN212564278U (en) | 2020-04-13 | 2020-04-13 | Planetary roller screw with involute thread profile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212564278U (en) |
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2020
- 2020-04-13 CN CN202020542354.XU patent/CN212564278U/en active Active
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