CN115638221A - Ultra-large lead planetary roller screw - Google Patents
Ultra-large lead planetary roller screw Download PDFInfo
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- CN115638221A CN115638221A CN202211260398.3A CN202211260398A CN115638221A CN 115638221 A CN115638221 A CN 115638221A CN 202211260398 A CN202211260398 A CN 202211260398A CN 115638221 A CN115638221 A CN 115638221A
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Abstract
The invention discloses an ultra-large lead planetary roller screw, which comprises a screw shaft, a screw rod shaft and a screw rod, wherein the screw shaft comprises a threaded part; wherein the thread part is provided with at least two external threads and a tooth-shaped ring is formed at least one axial end of the external threads; the nut is sleeved outside the screw shaft and provided with a hollow cavity, and at least two internal threads are formed on the inner wall of the hollow cavity; at least two rollers disposed between the screw shaft and the nut in a radial direction with respect to a central axis of the screw shaft; each roller is provided with at least two roller external threads and a tooth part for being meshed with the tooth-shaped ring; the two roller external threads are used for being simultaneously meshed with the external threads of the screw shaft and the internal threads of the nut; the thread direction of the external thread of the roller of each roller is opposite to that of the external thread of the screw shaft. The lead of the integral lead screw can be effectively enlarged, so that the breakthrough of the ultra-large lead of the integral lead screw is realized.
Description
Technical Field
The invention relates to the technical field of screw rod processing, in particular to an ultra-large lead planetary roller screw rod.
Background
The more used planetary roller screws in the conventional technology generally comprise a screw, a nut and a roller; wherein the lead screw comprises an external thread; a nut disposed about the lead screw and including internal threads; the roller is meshed with the external thread of the screw and the internal thread of the nut, and the planetary roller screw adopts the roller with threads to replace the ball as a force transmission unit, so that compared with the ball screw, the force transmission unit has larger contact radius and more contact points, and is superior to the ball screw in the aspects of position precision, rated load, rigidity, speed, service life and the like, and is widely applied to the fields of aviation, aerospace, precision machine tools, food packaging and the like in recent years.
In the planetary roller screw mechanism, the first member may be a screw shaft, the second member may be a nut mounted around the screw shaft, and each of the rollers has a thread engaged with threads provided on an outer radial surface of the screw shaft and an inner radial surface of the nut, respectively. In this case, the input load applied to the mechanism may be a rotational torque applied to the screw shaft, which causes linear movement of the nut, resulting in an axial output force, or the input load applied to the mechanism may be an axial force applied to the nut, which causes rotation of the screw shaft, resulting in an output torque. Alternatively, the first member may be a nut and the second member may be a threaded shaft. In this case, the input load on the mechanism may be a torque exerted on the nut, which causes a translational movement of the screw shaft, resulting in an axial output force, or the input load on the mechanism may be an axial force exerted on the screw shaft, which causes a rotational movement of the nut, resulting in an output torque.
For a planetary roller screw, the key efficiency factor is the lead of the screw. The lead of a lead screw is generally defined herein as the length of axial displacement of the nut in translation when the lead screw shaft makes one 360 ° turn or the length of axial displacement of the lead screw shaft when the nut makes one 360 ° turn.
The lead of the planetary roller screw commonly used in the prior art is limited within the range of the pitch diameter of the screw shaft. The main reasons for this are the following two points:
first, the pitch diameter of the rollers should be proportional to the pitch diameter of the screw shaft and inversely proportional to the number of threads of the screw shaft. When the lead of the screw needs to be enlarged, the number of threads of the screw shaft needs to be enlarged theoretically, namely, the increase of the lead of the screw is obtained by enlarging the number of the threads of the screw shaft, in the process, the pitch diameter of the roller is synchronously reduced along with the increase of the number of the threads of the screw shaft, and actually, for the integral planetary roller screw, the pitch diameter of the roller used in the integral planetary roller screw needs to be within a certain numerical range and cannot be reduced unlimitedly, because the overall structural strength of the roller is directly influenced along with the continuous reduction of the pitch diameter of the roller, and the stability of the operation process of the integral planetary roller screw is influenced.
Second, the prior art, for example, the patent of publication No. CN 107002841B discloses a planetary roller screw mechanism having a lead of 60mm or more, which is increased in lead compared to the conventional planetary roller screw mechanism, but the increased lead range is limited, mainly because the lead L4= p 4N 4, where N4 is the number of threads of the screw shaft and p4 is the value of the pitch, and in order to increase the lead L4, it is required to increase the number of threads and the value of the pitch of the screw shaft simultaneously, in this case, on the premise that the lead of the screw is increased, the lead angle of the external thread of the roller and the external thread of the screw shaft is increased simultaneously, and on the basis of the increase of the lead angle, there is a large meshing interference because the same axial direction of the thread, and in this case, it is required to make a modification of the external thread of the screw shaft to reduce the height of the external thread, and in this process, the reduction of the tooth profile of the height of the screw shaft and the external thread engagement of the pin shaft, and thus, the overall engagement effect of the screw shaft meshing of the thread engagement between the screw shaft and the screw shaft is found to be reduced by a factor of the limited lead of the screw shaft. Specifically, referring to the lead tables of example 1 and example 2 disclosed in paragraph 0080 of the specification thereof, the lead L4 in example 1 was 80mm and the nominal diameter of the screw shaft was 87mm, and the lead L4 in example 2 was 60mm and the nominal diameter of the screw shaft was 48mm, whereby it was found that the effective lead of the screw mechanism was not more than 1.5 times the nominal diameter of the screw shaft at the maximum.
Therefore, the planetary roller screw conventionally used in the prior art is limited by the size of the pitch diameter of the roller and the meshing structure of the whole roller and the screw shaft, so that the lead of the whole planetary roller screw is limited, and the lead is difficult to break through.
Disclosure of Invention
The invention aims to provide an ultra-large lead planetary roller screw to solve the technical effect of effectively enlarging the lead of an integral screw.
The ultra-large lead planetary roller screw is realized by the following steps:
an oversized-lead planetary roller screw comprising:
a screw shaft including a threaded portion; wherein the threaded portion is provided with at least two external threads and a toothed ring is formed at least one axial end of the external threads;
the nut is sleeved outside the screw shaft and provided with a hollow cavity, and at least two internal threads are formed on the inner wall of the hollow cavity;
at least two rollers arranged between the screw shaft and the nut in a radial direction with respect to a central axis of the screw shaft; each roller is provided with at least two roller external threads and a tooth part which is used for being meshed with the tooth-shaped ring; the two roller external threads are used for being simultaneously meshed with the external threads of the screw shaft and the internal threads of the nut;
the thread turning direction of the external thread of the roller of each roller is opposite to that of the external thread of the screw shaft;
the thread pitches of the external thread of the screw shaft, the internal thread of the nut and the external thread of the roller of each roller are the same; and
the pitch diameter D3 of the rollers is related to the pitch diameter D1 of the screw shaft, the number M1 of external threads of the screw shaft, and the number M3 of external threads of the rollers per roller by the following relationship:
in an alternative embodiment of the invention, the pitch diameter D3 of each roller is no greater than the pitch diameter D1 of the screw shaft.
In an alternative embodiment of the invention, the ultra-large lead planetary roller screw has a lead that is more than twice the pitch diameter of the screw shaft.
In an alternative embodiment of the invention, the ultra-large lead planetary roller screw has a lead of 1-500 mm.
In an alternative embodiment of the invention, the number of external roller threads per roller ranges from 2 to 500; and
the thread pitch ranges of the external thread of the screw shaft, the internal thread of the nut and the external thread of the roller of each roller are all 0.2-20 mm.
In an alternative embodiment of the invention, the number of roller external threads of each roller is not greater than the number of external threads of the screw shaft and not greater than the number of internal threads of the nut; and
the number of the internal threads of the nut is not more than the number of the external threads of the screw shaft.
In an alternative embodiment of the invention, the lead angle of the external thread of the screw shaft is the same as the lead angle of the roller external thread of each roller.
In an alternative embodiment of the invention, the number of roller external threads of each roller is not greater than the number of external threads of the screw shaft and not greater than the number of internal threads of the nut; and
the number of the internal threads of the nut is greater than the number of the external threads of the screw shaft, and the number of the internal threads of the nut and the number of the external threads of the screw shaft form a multiple which is greater than 1 time and less than or equal to 5 times.
In an alternative embodiment of the invention, the thread direction of the external roller thread of each roller is opposite to the thread direction of the internal nut thread.
In an alternative embodiment of the invention, the thread of the external roller thread of each roller is the same as the thread of the internal nut thread.
Compared with the prior art, the invention has the beneficial effects that: the ultra-large lead planetary roller screw increases the number M3 of the external threads of the rollers on the rollers, and the intermediate diameter of the rollersIs composed of
Therefore, when the M3 is increased, the pitch diameters of the rollers are synchronously increased, so that the problem that the structural strength of the screw is influenced by the fact that the pitch diameters of the rollers are reduced in the process of expanding the overall lead of the screw by increasing the number of the external threads on the screw shaft is solved, namely the ultra-large lead planetary roller screw can achieve the purpose of expanding the lead of the screw by increasing the number of the external threads on the screw shaft on the premise of not influencing the structural strength of the rollers.
Furthermore, through the design of the structure that the thread turning direction of the external thread of the roller of each roller is opposite to the thread turning direction of the external thread of the screw shaft, the condition that the meshing point deviates to the tip of the thread due to the modification of the external thread of the screw shaft by the meshing interference of the screw shaft and the roller in the prior art can be avoided, namely, the meshing effect of the screw shaft and the roller cannot be weakened on the premise of realizing the increase of the whole lead screw, so that the increase of the lead of the planetary roller screw is not limited by the limitation of the meshing problem of the screw shaft and the roller, and the lead of the screw can realize the breakthrough of an ultra-large lead.
Drawings
FIG. 1 is a schematic structural view of a super lead planetary roller screw of the present invention;
FIG. 2 is a schematic view of a screw shaft and rollers of the ultra-large lead planetary roller screw of the present invention;
FIG. 3 is a schematic view of a partial fitting structure of a screw shaft and a roller of the ultra-large lead planetary roller screw of the invention;
FIG. 4 is a schematic structural view of a screw shaft of the ultra-large lead planetary roller screw of the present invention;
FIG. 5 is a schematic view of a partial configuration of a nut of the ultra-large lead planetary roller screw of the present invention;
fig. 6 is a schematic diagram of the structure of the rollers of the ultra-large lead planetary roller screw of the present invention.
In the figure: the thread shaft comprises a screw shaft 1, an optical axis part 11, a thread part 12, a toothed ring 13, a clamping groove 14, an external thread 15, a nut 2, an internal thread 21, a roller 3, a roller external thread 31, a tooth part 32, an insertion part 33, a planet carrier 4 and a clamping ring 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1 to 6, the present invention provides a planetary roller screw with a super large lead, including: a screw shaft 1, a nut 2 and at least two rollers 3 are used in cooperation. In general, at the radial level of the integral nut 2, the nut 2 is located at the outermost layer, at least two rollers 3 are located at the intermediate layer, and the screw shaft 1 is located at the innermost layer, wherein at least two rollers 3 are meshed with the nut 2 and the screw shaft 1 at the same time.
In an alternative aspect, first, the screw shaft 1 includes an optical axis portion 11 and a threaded portion 12, wherein the threaded portion 12 is used for engaging with at least two rollers 3. For this threaded portion 12, at least two external threads 15 are provided on the threaded portion 12 and a toothed ring 13 is formed on at least one axial end of the external threads 15; that is, here, for both axial sides of the threaded portion 12, the tooth-shaped ring 13 may be provided at only one axial end of the external thread 15, or the tooth-shaped rings 13 may be provided at both axial ends of the external thread 15, which is not limited to this embodiment. It should be noted here that the toothed ring 13 is disposed at the axial end of the external thread 15, but this does not mean that the toothed ring 13 is necessarily connected to the external thread 15, that there is a certain distance between the toothed ring 13 and the external thread 15, or that both are directly connected together.
Secondly, a nut 2 is provided with a hollow cavity, and at least two internal threads 21 are formed on the inner wall of the hollow cavity; it should be noted that, for the internal thread 21 provided on the inner wall of the hollow cavity of the nut 2 here, it may extend along the entire inner wall of the hollow cavity, that is, the internal thread 21 is distributed over the entire inner wall of the hollow cavity of the nut 2, or the internal thread 21 may be formed only on a part of the structure in the hollow cavity of the nut 2, which both satisfy the usage requirement of the embodiment, and this embodiment is not limited in any way.
Furthermore, at least two rollers 3 arranged between the screw shaft 1 and the nut 2 in a radial direction with respect to the central axis of the screw shaft 1; it should be noted that the plurality of rollers 3 are identical in overall structure, and therefore the structure and parameters of the rollers 3 described in the following embodiments are applicable to any of the rollers 3.
Each roller 3 is provided with at least two roller external threads 31 and a tooth part 32 for meshing with the toothed ring 13; the two roller male screws 31 are configured to simultaneously mesh with the male screw 15 of the screw shaft 1 and the female screw 21 of the nut 2. The tooth parts 32 are located at the axial ends of the external roller threads 31, specifically, when one tooth ring 13 is arranged on the screw shaft 1, the tooth parts 32 are also arranged as one tooth ring, and when one tooth ring 13 is respectively arranged on the screw shaft 1 at the two axial ends of the external threads 15, that is, when two tooth rings 13 are arranged in total, the corresponding tooth parts 32 on the roller 3 are also arranged as two tooth rings.
To illustrate an alternative case taken in conjunction with the drawings herein, for the purpose of facilitating assembly, the at least two rollers 3 in this embodiment are assembled with the screw shaft 1 by a pair of planet carriers 4 in cooperation with a pair of snap rings 5. In detail, the axial ends of at least two rollers 3 are respectively sleeved with a planet carrier 4, specifically, two axial ends of the rollers 3 are respectively provided with an inserting portion 33, the outer diameter of which is smaller than that of a tooth portion 32, and the inserting portion is used for being fixedly inserted into the planet carrier 4, and a clamping groove 14 suitable for being embedded into the clamping ring 5 is concavely arranged on one side, away from the external thread 15, of the tooth portion 12 of the screw rod, under the structure, after the at least two rollers 3 and the two planet carriers 4 are inserted in place, a combined body formed by the rollers 3 and the planet carriers 4 is sleeved on the screw rod shaft 1, then the clamping ring 5 is clamped into the clamping groove 14, and after the clamping ring 5 and the clamping groove 14 are clamped in place, the clamping ring 5 can abut against the planet carrier 4 from one end, away from the rollers 3, of the planet carrier 4, and the effect of effectively assembling the rollers 3 and the planet carrier 4 on the screw rod shaft 1 is achieved through the pair of clamping rings 5. The snap ring 5 has a gap therein to facilitate the assembly of the snap ring 5 with the snap groove 14.
In addition to the above structure, it should be noted that the thread pitches of the male thread 15 of the screw shaft 1, the female thread 21 of the nut 2, and the roller male thread 31 of each roller 3 are the same; more specifically, the pitch of the male screw 15 of the screw shaft 1, the female screw 21 of the nut 2, and the roller male screw 31 of each roller 3 is in the range of 0.2 to 20mm. The pitch diameter D3 of the rollers 3 is related to the pitch diameter D1 of the screw shaft 1, the number M1 of the external threads 15 of the screw shaft 1 and the number M3 of the roller external threads 31 of each roller 3 by the following relations:
It should be noted that, in the present embodiment, the pitch diameter D3 of each roller 3 is not greater than the pitch diameter D1 of the screw shaft 1; the number M3 of the roller external threads 31 per roller 3 is not only not greater than the number M1 of the external threads 15 of the screw shaft 1, but also the number M3 of the roller external threads 31 per roller 3 is not greater than the number of the internal threads 21 of the nut 2. It should be noted that the pitch diameter in the present embodiment refers to the diameter of an imaginary cylinder passing through the equal width of the groove and the protrusion on the thread profile in the axial section of the thread, and the pitch diameter is the diameter determining the geometrical parameters and the fitting properties of the thread.
In addition to the above-described structure, it is also necessary to explain that the lead L of the planetary roller screw is generally obtained by the following relationship, L = P × M1; in the process, when the value of the number M1 of the external threads 15 of the screw shaft 1 is increased, the reduction of the diameter D3 of the roller 3 is inevitably brought about, and the numerical value adopted by the embodiment is at least 2 by increasing the value of M3, so that the problem of the reduction D3 caused by the increase of the numerical value of M1 can be counteracted, that is, when the value of the number M1 of the external threads 15 of the screw shaft 1 is increased, the value of M3 is synchronously increased, so that the diameter D3 of the roller 3 is not reduced due to the increase of M1, and therefore, in the process of increasing the overall lead L of the screw shaft by increasing the number M1 of the external threads 15 on the screw shaft 1, the problem that the structural strength of the roller 3 is affected by the decrease of the diameter D3 of the roller 3 is not caused, that the overall lead of the screw shaft is increased by increasing the number M1 of the external threads 15 on the screw shaft 1, does not occur, namely, the problem that the overall lead of the screw shaft is increased by increasing the external threads 15 on the planetary shaft 1 of the embodiment can be achieved on the premise that the overall lead of the screw shaft 1.
Further, based on L = P × M1 and M1= D1 × M3/D3, the lead L of the ultra-large lead planetary roller screw of the present embodiment having twice or more the pitch diameter D1 of the screw shaft 1 can be obtained by increasing the value of M3. Specifically, the number M3 of the roller male screws 31 per roller 3 in the present embodiment ranges from 2 to 500, and the number M3 of the roller male screws 31 per roller 3 preferably ranges from 2 to 200. The range of the lead L which can be realized correspondingly is 1-500 mm, and compared with the lead of the lead screw in any mature means disclosed in the prior art, the lead L can realize the ultra-large lead of the integral planet roller screw.
The lead L of the ultra-large lead planetary roller screw in this example is illustrated in table 1 in relation to the parameters of the various components:
TABLE 1 (units of all dimensions are mm)
As can be seen from the above table, the ultra-large lead planetary roller screw of the present embodiment has the lead L more than twice the pitch diameter D1 of the screw shaft 1, that is, compared with the prior art, the ultra-large lead of the whole planetary roller screw can be realized.
Example 2:
on the basis of the ultra-large lead planetary roller screw in the embodiment 1, the ultra-large lead planetary roller screw provided by the embodiment is further structurally designed as follows:
the thread direction of the roller external thread 31 of each roller 3 is opposite to the thread direction of the external thread 15 of the screw shaft 1. The spiral direction of the external roller threads 31 on the rollers 3 can be a forward spiral or a reverse spiral, which is not limited in this embodiment. Here, the roller male screw 31 of the roller 3 may have the same thread direction as the female screw 21 of the nut 2, or may have the opposite thread direction, but this embodiment is not limited thereto, and preferably, the roller male screw 31 of the roller 3 may have the opposite thread direction to the female screw 21 of the nut 2.
On the basis of the above-described structure, that is, the cross-thread structure is formed between the roller external thread 31 and the external thread 15 of the screw shaft 1, and in such a structure, that is, the engagement interference between the roller external thread 31 and the external thread 15 of the screw shaft 1 is small, and the lead angle of the external thread 15 of the screw shaft 1 is the same as the lead angle of the roller external thread 31 of each roller 3, the engagement interference between the roller external thread 31 and the external thread 15 of the screw shaft 1 can be completely eliminated.
Specifically, when the thread direction of the roller external thread 31 of each roller 3 is the same as the thread direction of the external thread 15 of the screw shaft 1, in order to achieve a large lead of the entire screw, it is necessary to increase the lead angles of the roller external thread 31 of the roller 3 and the external thread 15 of the screw shaft 1 simultaneously, and since the thread directions of the two threads are the same as each other as the lead angle increases, there is a large meshing interference, and at this time, it is necessary to reduce the tooth profile height of the external thread 15 of the screw shaft 1 by modifying the external thread 15 of the screw shaft 1. In this process, the reduction in the height of the tooth profile of the male screw 15 of the screw shaft 1 may cause the meshing point between the roller male screw 31 and the male screw 15 of the screw shaft 1 to shift toward the tooth tip of the male screw 15 of the screw shaft 1.
Therefore, in the present embodiment, by eliminating the problem of meshing interference between the roller external thread 31 and the external thread 15 of the screw shaft 1, the modification processing on the external thread 15 of the screw shaft 1 can be avoided, and the situation that the meshing point of the screw shaft 1 and the roller 3 deviates to the tip of the thread in the prior art can be directly avoided, that is, the meshing effect of the screw shaft 1 and the roller 3 cannot be weakened on the premise of realizing the increase of the whole screw lead, so that the increase of the lead of the planetary roller screw of the present invention is not limited by the limitation of the meshing problem of the screw shaft 1 and the roller 3, and thus the lead of the planetary roller screw of the present embodiment can realize the breakthrough of an ultra-large lead.
In addition to the above structure, further, in an alternative embodiment, the number of the internal threads 21 of the nut 2 is less than or equal to the number of the external threads 15 of the screw shaft 1. Preferably, the number of the female threads 21 of the nut 2 is equal to the number of the male threads 15 of the screw shaft 1, in which case there may be a slight amount of meshing interference of the roller male threads 31 and the female threads 21 of the nut 2 for the fitting process between the female threads 21 of the nut 2 and the roller male threads 31 of the rollers 3, where the amount of meshing interference is small, and here, for the slight amount of meshing interference, it may be adopted to modify the tooth profile of the female threads 21 of the nut 2 to reduce the tooth profile height of the female threads 21 of the nut 2, where the amount of modification is approximately 0.01 to 0.4 times the pitch of the female threads 2 of the nut 2.
Therefore, for the ultra-large lead planetary roller screw of the present embodiment, the increase of the lead of the whole planetary roller screw is not limited by the problem of engagement between the screw shaft and the roller 3 and between the roller 3 and the nut 2, so that the lead of the screw of the present embodiment can realize breakthrough of the ultra-large lead.
Example 3:
on the basis of the extra-large lead planetary roller screw in embodiment 1 or embodiment 2, the number of the internal threads 21 of the nut 2 provided by the extra-large lead planetary roller screw provided by the embodiment is greater than the number of the external threads 15 of the screw shaft 1, and the number of the internal threads 21 of the nut 2 is the multiple of the number of the external threads 15 of the screw shaft 1, which is greater than 1 time and less than or equal to 5 times.
It should be noted that, in this embodiment, the lead of the planetary roller screw that can be realized when the number of the internal threads 21 of the nut 2 is greater than the number of the external threads 15 of the screw shaft 1 is smaller than a value obtained by multiplying the number of the internal threads 21 of the nut 2 by the pitch of the internal threads 21 of the nut 2, and certainly, the ultra-large lead planetary roller screw of this embodiment can still reach the lead L that is more than twice the pitch diameter D1 of the screw shaft 1, that is, compared with a planetary roller screw widely used in the prior art, the embodiment can still realize breakthrough of the ultra-large lead of the overall planetary roller screw.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientations and positional relationships shown in the drawings only for the convenience of describing the present invention and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the present product is conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (10)
1. An ultra-large lead planetary roller screw, comprising:
a screw shaft including a threaded portion; wherein the threaded portion is provided with at least two external threads and a toothed ring is formed at least one axial end of the external threads;
the nut is sleeved outside the screw shaft and provided with a hollow cavity, and at least two internal threads are formed on the inner wall of the hollow cavity;
at least two rollers arranged between the screw shaft and the nut in a radial direction with respect to a central axis of the screw shaft; each roller is provided with at least two roller external threads and a tooth part for meshing with the tooth-shaped ring; the two roller external threads are used for being simultaneously meshed with the external threads of the screw shaft and the internal threads of the nut;
the thread turning direction of the external thread of the roller of each roller is opposite to that of the external thread of the screw shaft;
the thread pitches of the external thread of the screw shaft, the internal thread of the nut and the external thread of the roller of each roller are the same; and
the pitch diameter D3 of the rollers is related to the pitch diameter D1 of the screw shaft, the number M1 of external threads of the screw shaft, and the number M3 of external threads of the rollers per roller by the following relationship:
2. the ultra-large lead planetary roller screw of claim 1, wherein the pitch diameter D3 of each roller is not greater than the pitch diameter D1 of the screw shaft.
3. The ultra-large lead planetary roller screw of claim 1, wherein said ultra-large lead planetary roller screw has a lead that is more than twice the pitch diameter of the screw shaft.
4. The oversized planetary roller screw of claim 3, wherein the oversized planetary roller screw has a lead of 1-500 mm.
5. The ultra-lead planetary roller screw of claim 1, wherein the number of external roller threads per roller is in the range of 2 to 500; and
the thread pitches of the external thread of the screw shaft, the internal thread of the nut and the external thread of the roller of each roller are all 0.2-20 mm.
6. An ultra-large lead planetary roller screw according to claim 1 or 4, wherein the number of the roller external threads of each roller is not more than the number of the external threads of the screw shaft and not more than the number of the internal threads of the nut; and
the number of the internal threads of the nut is not more than the number of the external threads of the screw shaft.
7. The ultra-large lead planetary roller screw of claim 1, wherein the lead angle of the external thread of the screw shaft is the same as the lead angle of the external thread of the roller of each roller.
8. An ultra-large lead planetary roller screw according to claim 1 or 4, wherein the number of the roller external threads of each roller is not more than the number of the external threads of the screw shaft and not more than the number of the internal threads of the nut; and
the number of the inner threads of the nut is greater than the number of the outer threads of the screw shaft, and the number of the inner threads of the nut and the number of the outer threads of the screw shaft form a multiple which is greater than 1 time and less than or equal to 5 times.
9. The ultra-large lead planetary roller screw of claim 1 or 4, wherein the thread direction of the external roller thread of each roller is opposite to the thread direction of the internal nut thread.
10. The ultra-large lead planetary roller screw according to claim 1 or 4, wherein the thread direction of the external roller thread of each roller is the same as the thread direction of the internal nut thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211260398.3A CN115638221A (en) | 2022-10-14 | 2022-10-14 | Ultra-large lead planetary roller screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211260398.3A CN115638221A (en) | 2022-10-14 | 2022-10-14 | Ultra-large lead planetary roller screw |
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| CN115638221A true CN115638221A (en) | 2023-01-24 |
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| CN202211260398.3A Pending CN115638221A (en) | 2022-10-14 | 2022-10-14 | Ultra-large lead planetary roller screw |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116989110A (en) * | 2023-09-27 | 2023-11-03 | 江西炬龙精密科技有限公司 | Uniform load planetary roller screw pair |
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- 2022-10-14 CN CN202211260398.3A patent/CN115638221A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116989110A (en) * | 2023-09-27 | 2023-11-03 | 江西炬龙精密科技有限公司 | Uniform load planetary roller screw pair |
| CN116989110B (en) * | 2023-09-27 | 2023-12-12 | 江西炬龙精密科技有限公司 | Uniform load planetary roller screw pair |
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