CN117140410A - Differential type planetary roller screw pair assembly fixture and assembly method - Google Patents
Differential type planetary roller screw pair assembly fixture and assembly method Download PDFInfo
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- CN117140410A CN117140410A CN202311407558.7A CN202311407558A CN117140410A CN 117140410 A CN117140410 A CN 117140410A CN 202311407558 A CN202311407558 A CN 202311407558A CN 117140410 A CN117140410 A CN 117140410A
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- 230000005540 biological transmission Effects 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
- B25B11/02—Assembly jigs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
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Abstract
The application discloses a differential planetary roller screw pair assembly fixture and an assembly method. Through the setting of the supplementary clamping device of roller for the roller can be stable erect, carry out radial movement during the assembly of being convenient for, through the setting of roller auxiliary stay baffle and circular arc formula through groove, can support the roller when roller and nut meshing in the assembly process, guarantee the stability of roller during the assembly. The assembly fixture is simple in structure, stable in clamping, high in applicability and compatibility, and the problems of complex assembly process and poor assembly stability caused by inconvenient use of the existing assembly fixture are effectively solved. The assembly method can finish assembly according to the operation of the established steps, and can realize the rapid and complete engagement of the roller and the nut only by ensuring the arrangement position and the sequence of the roller in the assembly process, thereby avoiding assembly failure, and the assembly method is simple to operate and high in assembly efficiency.
Description
Technical Field
The application relates to the field of transmission device assembly, in particular to a differential type planetary roller screw pair assembly fixture and an assembly method.
Background
The planetary roller screw pair is a mechanical transmission mechanism for converting rotary motion into linear motion, and is widely applied to national strategic emerging industries such as aerospace, automobiles and ships, weaponry, new energy sources and the like due to the advantages of high bearing capacity, high power ratio, high transmission precision, high reliability and the like. The differential planetary roller screw pair has the advantages that the rollers and the nuts are of ring groove structures, and the planetary roller screw pair has no thread teeth and no inner gear ring, so that the structure of the planetary roller screw pair is simplified to a certain extent, the processing cost of the planetary roller screw pair is reduced, and the planetary roller screw pair is beneficial to further popularization of practical application.
Because of the characteristics of compact structure and multi-body multi-dental floss contact of the differential planetary roller screw pair, a plurality of rollers need to move radially when the differential planetary roller screw pair is assembled, so that the small-diameter section ring groove of the rollers is meshed with the nut ring groove correctly; in addition, each roller is uniformly distributed along the circumferential direction, and the axial distance between the large-diameter ring groove teeth between adjacent rollers in the clockwise direction is required to be P/n (P is the screw pitch and n is the number of rollers). Therefore, the differential planetary roller screw pair can be precisely assembled by a specific assembly fixture, and the assembly is a great technical problem. Abnormal assembly of the differential planetary roller screw pair can influence normal operation of the differential planetary roller screw pair, so that key performances such as transmission precision, bearing capacity and service life of the differential planetary roller screw pair are greatly reduced.
In order to solve the above-mentioned problems, patent CN115111335B discloses a "differential planetary roller screw with a small lead, an assembling tool and an assembling method", which realizes radial positioning of rollers by the assembling tool when assembling the differential planetary roller screw pair, and by inserting the rollers into corresponding holes of a retainer first, and installing the retainer and a snap spring in a nut. However, the large diameter of the large diameter section of the roller is larger than the small diameter of the ring groove section of the nut, so that the method cannot realize that the roller is assembled firstly and then placed in the nut after the retainer, and the roller is required to be kept from tilting at the moment in the assembling process, and the assembling process is complicated. In addition, although the second positioning structure of the assembly fixture can well ensure uniform arrangement and spatial phase distribution of the rollers, the second positioning structure cannot meet the movement of the rollers in the radial direction, and correct assembly of the differential planetary roller screw pair is difficult to realize.
In the patent CN110103018B, a "PWG differential planetary roller screw assembly tool and an assembly method thereof" is disclosed, and when the differential planetary roller screw assembly is assembled, the sliding cylinder is stretched to enable the connecting rod to drive the roller clamping device to radially shrink, so that a plurality of rollers can be installed inside the nut; the compression of the slide tube causes the connecting rod to drive the roller clamping device to radially expand, so that a plurality of rollers can be meshed with the nut. Although the assembly tool and the method can better solve the problem of radial movement of the roller, the distance from the positioning plate to the roller clamping device needs to be accurately calculated, so that the error compatibility is poor during assembly; although the roller clamping device adopts plastic with strong elasticity, only a small part of the roller is clamped and suspended, so that the stability of the roller clamping device is problematic during assembly; in addition, the assembling tool adopts a plurality of connecting rods to be matched with springs, and the structure of the assembling tool is complex.
Therefore, in order to avoid the defects of the existing differential type planetary roller screw pair assembly fixture and the assembly method, the application designs the differential type planetary roller screw pair assembly fixture which has a simple structure and meets the assembly requirement based on the structural characteristics of the differential type planetary roller screw pair, and provides an assembly method which is easy to operate, and has important significance for solving the assembly problem of the differential type planetary roller screw pair.
Disclosure of Invention
The embodiment of the application provides the assembly fixture and the assembly method for the differential type planetary roller screw pair, which solve the defects of the assembly fixture and the assembly method for the differential type planetary roller screw pair in the prior art, can greatly improve the assembly precision and the assembly efficiency of the differential type planetary roller screw pair, and are beneficial to enterprises to improve the production efficiency of the differential type planetary roller screw pair.
The embodiment of the application provides a differential planetary roller screw pair assembly fixture, which comprises a fixed base device, a roller auxiliary clamping device, a nut auxiliary clamping device and an external expansion auxiliary telescopic device.
The fixed base device comprises an assembly upper bottom plate, a supporting shaft and an assembly lower bottom plate, wherein the assembly lower bottom plate is used for being fixed on the tool table, the supporting shaft is used for fixing the assembly upper bottom plate on the assembly lower bottom plate, and an assembly hole is formed in the assembly upper bottom plate.
The external expansion auxiliary expansion device comprises an internal thread base, an expansion link, a sliding seat and a guide rail;
the number of the guide rails is the same as that of the differential planetary roller screw pair to be assembled, and the guide rails are uniformly distributed and fixed on the top surface of the assembly upper bottom plate by taking the assembly holes as circle centers;
each guide rail is connected with one slide seat in a sliding way;
the internal thread base is fixed on the bottom surface of the assembly upper bottom plate, internal threads are arranged in the internal thread base, and the internal threads and the assembly holes are coaxially arranged;
the telescopic rod comprises a conical section and an external thread section, and the external thread section is matched with the internal thread of the internal thread base to realize the up-and-down movement of the telescopic rod.
The roller auxiliary clamping device comprises roller clamping bases, wherein the number of the roller clamping bases is consistent with that of differential planetary roller screw pairs to be assembled, namely, the number of the roller clamping bases is consistent with that of the sliding seat and the guide rail; the roller clamping base is fixedly connected to the sliding seat; the roller clamping base is provided with a conical part at the bottom of one side close to the assembly hole, the conical section of the telescopic rod is the same as the conical degree of the conical part, and the upper end of the roller clamping base is provided with a roller clamping hole.
The nut auxiliary clamping device comprises a nut auxiliary clamping sleeve, the nut auxiliary clamping sleeve is detachably arranged at the upper end of the assembly upper bottom plate, and the nut auxiliary clamping sleeve and the assembly hole are coaxially arranged.
As some embodiments of the present application, a side groove is further formed on one side of the roller clamping hole, and the side groove is located on one side away from the assembly hole.
As some embodiments of the application, the roller auxiliary clamping device further comprises a roller auxiliary supporting baffle plate, the roller auxiliary supporting baffle plate is fixedly arranged at the upper end of the roller clamping base, one side of the roller auxiliary supporting baffle plate, which is far away from the assembly hole, is provided with an arc-shaped through groove, the diameter of the arc-shaped through groove is consistent with that of the small-diameter section of the roller, the small-diameter section of the roller can be supported, and the stability of the roller during assembly is ensured to a certain extent.
According to some embodiments of the application, a limiting shaft is arranged at the bottom of the roller auxiliary supporting baffle, and a limiting hole corresponding to the position of the limiting shaft is formed at the upper end of the roller clamping base; the limiting shaft of the roller auxiliary supporting baffle is inserted into the limiting hole of the roller clamping base for assembly, and the corresponding roller auxiliary supporting baffle can be conveniently replaced according to the diameter of the small-diameter section of the roller.
As some embodiments of the present application, the nut auxiliary clamping device further includes a nut sleeve positioning pin, and the nut auxiliary clamping sleeve is detachably mounted at the upper end of the assembly upper base plate through the nut sleeve positioning pin.
Preferably, the four support shafts are used for fixing the assembly upper bottom plate on the assembly lower bottom plate in a threaded connection mode.
As some embodiments of the application, the number of the roller clamping bases is six, namely, the number of the sliding seat and the number of the guide rail are six, and the roller clamping bases are suitable for assembling a differential planetary roller screw pair with six rollers.
Preferably, in some embodiments of the present application, the number of the nut sleeve positioning pins is six, and the nut auxiliary clamping sleeve is connected with the assembly upper bottom plate through the six nut sleeve positioning pins.
Preferably, the guide rail is uniformly distributed and fixed on the top surface of the assembly upper bottom plate by a plurality of screws with the assembly holes as circle centers.
Preferably, the internal thread base is fixed on the bottom surface of the assembly upper bottom plate through a plurality of screws.
As the preference of some embodiments of the application, the bottom of the roller clamping base is provided with four threaded holes, and the roller clamping base is fixedly connected with the sliding seat through screws.
The embodiment of the application also provides a differential planetary roller screw assembly method, which is based on the differential planetary roller screw assembly clamp and comprises the following steps:
s1, according to the size of a differential planetary roller screw pair and the number of rollers, a fixed base device and an external expansion auxiliary telescopic device are installed in sequence, the roller auxiliary clamping devices are respectively installed on a sliding seat, and the roller auxiliary clamping devices are folded together; then, sequentially mounting the rollers on a roller clamping base;
s2, checking whether the positions and the placing sequences of the rollers are correct or not through side grooves of the roller clamping base;
s3, installing the nut auxiliary clamping sleeve on the assembly upper bottom plate, and fixing the nut on the nut auxiliary clamping sleeve;
s4, continuously rotating the telescopic rod to enable the telescopic rod to ascend, and enabling the roller clamping base to drive the sliding seat to move outwards along the guide rail by means of the conical section of the telescopic rod and the conical section of the roller clamping base until the annular groove of the small-diameter section of the roller is completely meshed with the annular groove of the nut, and meanwhile, matching the internal thread base with the external thread section of the telescopic rod has a self-locking function, so that radial movement of the roller is limited;
s5, installing the retainer inside one side of the nut and matching with the top end of the roller;
s6, screwing the screw rod from the top end of the nut to enable the screw rod to be meshed with the large-diameter section of the roller until the screw rod is meshed with more than half of the ring grooves of the large-diameter section of the roller, and suspending screw rod screwing;
s7, reversely rotating the telescopic rod to enable the telescopic rod to descend and take out;
s8, continuously rotating the screw rod until the screw rod is completely meshed with the large-diameter section of the roller;
s9, taking out the assembled differential planetary roller screw pair, and installing the retainer inside the other side of the nut, thereby completing the assembly of the differential planetary roller screw pair.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
through the setting of the supplementary clamping device of roller for the roller can be stable erect, carry out radial movement during the assembly of being convenient for, through the setting of roller auxiliary stay baffle and circular arc formula through groove, can support the roller when roller and nut meshing in the assembly process, guarantee the stability of roller during the assembly.
Through offer the supplementary slot of different quantity in the specific direction of different rollers, combine the setting of side groove in the supplementary clamping device of roller again, can be when the assembly, whether the position and the direction that the audio-visual inspection roller was placed are accurate, realize differential planet roller screw pair's accurate assembly, prevent to lead to the assembly failure because of the roller misplacement.
Through the setting of the supplementary telescoping device of design flaring for all rollers can synchronous steady radial movement, thereby make all rollers all synchronous with the nut realization meshing, when improving assembly efficiency, guaranteed the accuracy of roller assembly.
Through the arrangement of the expansion auxiliary telescopic device, the assembly fixture can be suitable for the assembly of differential planetary roller screw pairs with different models and sizes.
The assembly fixture for the differential planetary roller screw pair has the advantages of simple structure, stable clamping, strong applicability and compatibility, and effectively solves the problems of complex assembly process and poor assembly stability caused by inconvenient use of the existing assembly fixture.
The assembly method can finish assembly according to the operation of the established steps, and can realize the rapid and complete engagement of the roller and the nut only by ensuring the arrangement position and the sequence of the roller in the assembly process, thereby avoiding assembly failure, and the assembly method is simple to operate and high in assembly efficiency.
Drawings
Fig. 1 is an assembly schematic diagram of a differential planetary roller screw pair according to an embodiment of the present application.
Fig. 2 is a schematic perspective view of a fixing base device according to an embodiment of the present application.
Fig. 3 is a schematic perspective view of a roller-assisted clamping device according to an embodiment of the application.
Fig. 4 is a schematic perspective view of a nut auxiliary clamping device according to an embodiment of the application.
Fig. 5 is a schematic perspective view of an expanding auxiliary telescopic device according to an embodiment of the present application.
Fig. 6 is a schematic perspective view of a telescopic rod according to an embodiment of the present application.
Fig. 7 is a schematic diagram of the distribution of the clamping holes of the roller according to the embodiment of the application.
FIG. 8 is a schematic diagram of different types of rollers and their distribution according to an embodiment of the present application.
Fig. 9 is a schematic view of an embodiment of the roller assembly of the present application.
Fig. 10 is an exploded view of an assembly jig for a differential planetary roller screw pair according to an embodiment of the present application.
FIG. 11 is a schematic cross-sectional view of a differential planetary roller screw pair according to an embodiment of the present application.
The reference numerals are: 10. a stationary base means; 11. assembling an upper bottom plate; 11a, assembly holes; 12. a support shaft; 13. assembling a lower bottom plate; 20. the roller assists the clamping device; 21. a roller auxiliary supporting baffle; 21a, circular arc through grooves; 22. a roller clamping base; 22a, a conical portion; 22b, side grooves; 30. the nut assists the clamping device; 31. the nut assists in clamping the sleeve; 32. positioning pin shafts of nut sleeves; 40. an external expansion auxiliary telescopic device; 41. an internal thread base; 41a, internal threads; 42. a telescopic rod; 42a, a conical section; 42b, an external thread segment; 43. a slide; 44. a guide rail; 50. differential planetary roller screw pair; 51. a screw rod; 52. a roller; 521. a first roller; 522. a second roller; 523. a third roller; 52a, auxiliary grooves; 52b, a small diameter section; 52c, a large diameter section; 53. a nut; 54. a retainer; 60. a roller clamping hole; 611. the first roller is positively clamped in the hole; 612. the second roller clamps the hole positively; 613. the third roller clamps the hole positively; 614. the third roller reversely clamps the hole; 615. the second roller reversely clamps the hole; 616. the first roller is reversely clamped in the hole.
Detailed Description
In order to better understand the above technical solution, the following detailed description will explain the above technical solution with specific embodiments.
In order to more clearly explain the structure of the differential planetary roller screw pair assembly jig and the differential planetary roller screw pair assembly method of the present application, as shown in fig. 11, in the present application, the assembly of the differential planetary roller screw pair 50 including six rollers 52 is exemplified, the differential planetary roller screw pair 50 includes a screw 51, rollers 52, a nut 53 and a holder 54, the rollers 52 further include an auxiliary groove 52a for assisting positioning at the time of assembly, a small diameter section 52b engaged with the nut 53 and a large diameter section 52c engaged with the screw 51, the portion of the screw 51 engaged with the large diameter section 52c of the roller 52 is in the form of a screw thread, both the small diameter section 52b and the large diameter section 52c of the roller 52 are in the form of a ring groove, and the portion of the nut 53 engaged with the small diameter section 52b of the roller 52 is also in the form of a ring groove.
As shown in fig. 8, when the differential planetary roller screw pair 50 includes six rollers 52, the rollers 52 may be divided into a first roller 521, a second roller 522 and a third roller 523, wherein one auxiliary groove 52a is formed at a shorter end of the first roller 521 from the starting position of the ring groove of the large diameter section 52c, two auxiliary grooves 52a are formed at a shorter end of the second roller 522 from the starting position of the ring groove of the large diameter section 52c, and three auxiliary grooves 52a are formed at a shorter end of the third roller 523 from the starting position of the ring groove of the large diameter section 52 c.
Example 1: the embodiment is a differential planetary roller screw assembly fixture, as shown in fig. 1-6, comprising a fixed base device 10, a roller auxiliary clamping device 20, a nut auxiliary clamping device 30 and an external expansion auxiliary telescopic device 40.
The fixing base device 10 comprises an assembly upper base plate 11, supporting shafts 12 and an assembly lower base plate 13, wherein the assembly lower base plate 13 is used for being fixed on a tool table, the four supporting shafts 12 are used for fixing the assembly upper base plate 11 on the assembly lower base plate 13, and an assembly hole 11a is formed in the middle of the assembly upper base plate 11.
The external expansion auxiliary telescopic device 40 comprises an internal thread base 41, a telescopic rod 42, a sliding seat 43 and a guide rail 44;
the number of the guide rails 44 is the same as the number of the rollers 52 of the differential planetary roller screw pair 50 to be assembled, namely, the number of the guide rails 44 is six, and the guide rails 44 are uniformly distributed and fixed on the top surface of the assembly upper base plate 11 by a plurality of screws with the assembly holes 11a as circle centers; each guide rail 44 is slidably connected with a slide seat 43;
the internal thread base 41 is fixed on the bottom surface of the assembly upper bottom plate 11 through a plurality of screws, internal threads 41a are arranged in the internal thread base, and the internal threads 41a and the assembly holes 11a are coaxially arranged;
the telescopic rod 42 comprises a conical section 42a and an external thread section 42b, and the external thread section 42b is matched with the internal thread 41a of the internal thread base 41 to realize the up-and-down movement of the telescopic rod 42.
The roller auxiliary clamping device 20 comprises roller clamping bases 22, wherein the number of the roller clamping bases 22 is identical to that of rollers 52 of a differential planetary roller screw pair 50 to be assembled, and the number of the rollers is six; four threaded holes are formed in the bottom of the roller clamping base 22 and are fixedly connected with the sliding seat 43 through screws; the bottom of one side of the roller clamping base 22, which is close to the assembly hole 11a, is provided with a taper part 22a, the taper section 42a of the telescopic rod 42 is the same as the taper of the taper part 22a, the upper end of the roller clamping base 22 is provided with a roller clamping hole 60, as shown in fig. 7, and the roller clamping holes 60 of the six roller clamping bases 22 are numbered in sequence in the clockwise direction: the first roller forward clamping hole 611, the second roller forward clamping hole 612, the third roller forward clamping hole 613, the third roller reverse clamping hole 614, the second roller reverse clamping hole 615, and the first roller reverse clamping hole 616.
The roller clamping base 22 is also provided with a side groove 22b on one side of the roller clamping hole 60, and the side groove 22b is positioned on the side away from the assembly hole 11a.
The roller auxiliary clamping device 20 further comprises a roller auxiliary supporting baffle 21, the roller auxiliary supporting baffle 21 is fixedly arranged at the upper end of the roller clamping base 22, an arc-shaped through groove 21a is formed in one side, far away from the assembly hole 11a, of the roller auxiliary supporting baffle 21, the diameter of the arc-shaped through groove 21a is consistent with that of the small-diameter section 52b of the roller 52, the small-diameter section 52b of the roller 52 can be supported, and stability of the roller 52 during assembly is guaranteed to a certain extent.
The bottom of the roller auxiliary supporting baffle 21 is provided with a limiting shaft, and the upper end of the roller clamping base 22 is provided with a limiting hole corresponding to the position of the limiting shaft; the corresponding roller auxiliary supporting baffle 21 can be conveniently replaced according to the diameter of the small diameter section 52b of the roller 52 by inserting the limiting shaft of the roller auxiliary supporting baffle 21 into the limiting hole of the roller clamping base 22 for assembly.
The nut auxiliary clamping device 30 comprises nut auxiliary clamping sleeves 31 and nut sleeve positioning pins 32, the number of the nut sleeve positioning pins 32 is six, the nut auxiliary clamping sleeves 31 are detachably mounted at the upper end of the assembly upper base plate 11 through the six nut sleeve positioning pins 32, and the nut auxiliary clamping sleeves 31 and the assembly holes 11a are coaxially arranged.
The technical scheme provided by the embodiment of the application at least has the following technical effects or advantages:
through the setting of the auxiliary clamping device 20 of the roller for the roller 52 can be stable upright, radial movement is carried out during assembly, and through the setting of the auxiliary supporting baffle 21 of the roller and the circular arc through groove 21a, the roller 52 during engagement of the roller 52 and the nut 53 in the assembly process can be supported, so that the stability of the roller 52 during assembly is ensured.
By forming the auxiliary grooves 52a with different numbers in the specific directions of the different rollers 52 and combining with the arrangement of the side grooves 22b in the roller auxiliary clamping device 20, the accurate assembly of the differential planetary roller screw pair 50 can be realized by visually checking whether the positions and directions of the rollers 52 are accurate during assembly, and assembly failure caused by incorrect placement of the rollers 52 is prevented.
By designing the arrangement of the expansion auxiliary telescopic device 40, all the rollers 52 can synchronously and stably move radially, so that all the rollers 52 can synchronously mesh with the nut 53, and the assembly efficiency is improved and the assembly accuracy of the rollers 52 is ensured.
Through the arrangement of the expansion auxiliary telescopic device 40, the assembly fixture can be suitable for the assembly of differential planetary roller screw pairs with different models and sizes.
The assembly fixture for the differential planetary roller screw pair has the advantages of simple structure, stable clamping, strong applicability and compatibility, and effectively solves the problems of complex assembly process and poor assembly stability caused by inconvenient use of the existing assembly fixture.
Example 2: the embodiment is a differential planetary roller screw assembly method, which uses the differential planetary roller screw assembly fixture shown in embodiment 1, and comprises the following specific steps:
s1, as shown in fig. 2 and 5, a fixed base device 10 and an external expansion auxiliary telescopic device 40 are installed, six roller auxiliary clamping devices 20 are respectively installed on a sliding seat 43 through screws, and the six roller auxiliary clamping devices 20 are folded together; as shown in fig. 9 and 10, the first roller 521 is placed in the first roller forward clamping hole 611 with one end having one auxiliary groove 52a facing downward, and the other first roller 521 is placed in the first roller reverse clamping hole 616 with one end having one auxiliary groove 52a facing upward; the second roller 522 is placed at the second roller forward clamping hole 612 with one end with the two auxiliary grooves 52a facing downward, and the other second roller 522 is placed at the second roller reverse clamping hole 615 with one end with the two auxiliary grooves 52a facing upward; the third roller 523 is placed at the third roller forward clamping hole 613 with one end with three auxiliary grooves 52a facing downward, and the other third roller 523 is placed at the third roller reverse clamping hole 614 with one end with three auxiliary grooves 52a facing upward.
S2, checking whether the positions and the arrangement sequence of the rollers 52 are correctly arranged or not through the side grooves 22b of the roller auxiliary clamping device 20.
S3, the nut auxiliary clamping sleeve 31 is connected with the assembly upper base plate 11 through six nut sleeve positioning pins 32, and then the nut 53 is fixed on the nut auxiliary clamping sleeve 31 through six screws.
S4, continuously rotating the telescopic rod 42 to enable the telescopic rod 42 to ascend, radially moving the six roller auxiliary clamping devices 20 and the rollers 52 together by means of the conical section 42a of the telescopic rod 42 and the conical part 22a of the roller clamping base 22 until the annular groove of the small-diameter section 52b of the roller 52 is completely meshed with the annular groove of the nut 53, and simultaneously enabling the internal thread base 41 and the telescopic rod 42 to have a self-locking function in a threaded fit mode, so that the radial movement of the roller 52 is limited.
And S5, installing a retainer 54 inside one side of the nut 53 and matching with the top ends of the six rollers 52.
S6, screwing the screw rod 51 from the top end of the nut 53 to enable the screw rod 51 to be meshed with the large-diameter section 52c of the roller 52 until the screw rod 51 is meshed with more than half of the ring grooves of the large-diameter section 52c of the roller 52, and suspending screwing of the screw rod 51;
and S7, reversely unscrewing the telescopic rod 42 until the telescopic rod 42 is completely taken out.
And S8, continuing to rotate the screw rod 51, wherein the rotation direction of the screw rod is consistent with that of the step S6 until the screw rod is completely meshed with the large-diameter section 52c of the roller 52.
And S9, taking out the assembled differential planetary roller screw pair 50, mounting a retainer 54 inside the other side of the nut 53 and matching with the bottom ends of the six rollers 52, thereby completing the assembly of the differential planetary roller screw pair 50.
The technical scheme provided by the embodiment of the application at least has the following technical effects or advantages:
the assembly method can complete assembly only by operating according to the established steps, and can realize rapid and complete engagement of the roller 52 and the nut 53 only by ensuring the arrangement position and the sequence of the roller 52 in the assembly process, so that assembly failure is avoided, the operation is simple, and the assembly efficiency is high.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The differential planetary roller screw pair assembly fixture is characterized by comprising a fixed base device (10), a roller auxiliary clamping device (20), a nut auxiliary clamping device (30) and an external expansion auxiliary telescopic device (40);
the fixed base device (10) comprises an assembly upper base plate (11), a supporting shaft (12) and an assembly lower base plate (13), wherein the assembly lower base plate (13) is used for being fixed on a tool table, the supporting shaft (12) is used for fixing the assembly upper base plate (11) on the assembly lower base plate (13), and an assembly hole (11 a) is formed in the assembly upper base plate (11);
the external expansion auxiliary telescopic device (40) comprises an internal thread base (41), a telescopic rod (42), a sliding seat (43) and a guide rail (44); the number of the guide rails (44) is the same as the number of the rollers (52) of the differential planetary roller screw pair (50) to be assembled, and the guide rails (44) are uniformly distributed and fixed on the top surface of the assembly upper base plate (11) by taking the assembly holes (11 a) as circle centers; each guide rail (44) is connected with one sliding seat (43) in a sliding way; the internal thread base (41) is fixed on the bottom surface of the assembly upper bottom plate (11), internal threads (41 a) are arranged in the internal thread base, and the internal threads (41 a) and the assembly holes (11 a) are coaxially arranged; the telescopic rod (42) comprises a conical section (42 a) and an external thread section (42 b), and the external thread section (42 b) is in threaded fit with an internal thread (41 a) of the internal thread base (41) to realize up-and-down movement of the telescopic rod (42);
the roller auxiliary clamping device (20) comprises roller clamping bases (22), and the number of the roller clamping bases (22) is consistent with the number of rollers (52) of a differential planetary roller screw pair (50) to be assembled; the roller clamping base (22) is fixedly connected to the sliding seat (43); a conical part (22 a) is arranged at the bottom of one side of the roller clamping base (22) close to the assembly hole (11 a), the conical degree of the conical section (42 a) of the telescopic rod (42) is the same as that of the conical part (22 a), and a roller clamping hole (60) is formed in the upper end of the roller clamping base (22);
the nut auxiliary clamping device (30) comprises a nut auxiliary clamping sleeve (31), the nut auxiliary clamping sleeve (31) is detachably mounted at the upper end of the assembly upper base plate (11), and the nut auxiliary clamping sleeve (31) and the assembly hole (11 a) are coaxially arranged.
2. The assembly fixture for the differential planetary roller screw pair according to claim 1, wherein a side groove (22 b) is further formed on one side of the roller clamping hole (60), and the side groove (22 b) is located on one side away from the assembly hole (11 a).
3. The assembly fixture for the differential planetary roller screw pair according to claim 2, wherein the roller auxiliary clamping device (20) further comprises a roller auxiliary supporting baffle plate (21), the roller auxiliary supporting baffle plate (21) is fixedly arranged at the upper end of the roller clamping base (22), one side, far away from the assembly hole (11 a), of the roller auxiliary supporting baffle plate (21) is provided with an arc-shaped through groove (21 a), and the diameter of the arc-shaped through groove (21 a) is consistent with the large diameter of the small-diameter section (52 b) of the roller (52).
4. A differential planetary roller screw pair assembly fixture according to claim 3, wherein a limiting shaft is arranged at the bottom of the roller auxiliary supporting baffle (21), and a limiting hole corresponding to the position of the limiting shaft is formed in the upper end of the roller clamping base (22); the limiting shaft of the roller auxiliary supporting baffle plate (21) is inserted into the limiting hole of the roller clamping base (22) for assembly.
5. The assembly fixture for the differential planetary roller screw pair according to claim 1, wherein the nut auxiliary clamping device (30) further comprises a nut sleeve positioning pin (32), and the nut auxiliary clamping sleeve (31) is detachably mounted at the upper end of the assembly upper base plate (11) through the nut sleeve positioning pin (32).
6. The differential planetary roller screw pair assembly fixture according to claim 1, wherein four support shafts (12) are provided, and the four support shafts (12) fix the assembly upper base plate (11) on the assembly lower base plate (13) in a threaded connection mode.
7. The differential planetary roller screw pair assembly fixture according to claim 5, wherein the number of the nut sleeve positioning pins (32) is six, and the nut auxiliary clamping sleeve (31) is connected with the assembly upper base plate (11) through the six nut sleeve positioning pins (32).
8. The assembly fixture for the differential planetary roller screw pair according to claim 1, wherein the guide rail (44) is uniformly distributed and fixed on the top surface of the assembly upper base plate (11) by a plurality of screws with the assembly holes (11 a) as circle centers;
the internal thread base (41) is fixed on the bottom surface of the assembly upper bottom plate (11) through a plurality of screws;
four threaded holes are formed in the bottom of the roller clamping base (22), and the roller clamping base is fixedly connected with the sliding seat (43) through screws.
9. The assembly fixture for the differential planetary roller screw pair according to claim 1, wherein the number of the roller clamping base (22), the sliding seat (43) and the guide rail (44) is six.
10. A method for assembling a differential planetary roller screw pair, characterized in that the method is based on the differential planetary roller screw pair assembly fixture as claimed in claim 2, comprising the following steps:
s1, according to the size of a differential planetary roller screw pair (50) and the number of rollers (52), a fixed base device (10) and an external expansion auxiliary telescopic device (40) are installed in sequence, roller auxiliary clamping devices (20) are respectively installed on sliding seats (43), and the roller auxiliary clamping devices (20) are folded together; then, sequentially mounting the rollers (52) on the roller clamping base (22);
s2, checking whether the positions and the placing sequences of the rollers (52) are correct or not through side grooves (22 b) of the roller clamping base (22);
s3, installing the nut auxiliary clamping sleeve (31) on the assembly upper base plate (11), and fixing the nut (53) on the nut auxiliary clamping sleeve (31);
s4, continuously rotating the telescopic rod (42) to enable the telescopic rod to ascend, and enabling the roller clamping base (22) to drive the sliding seat (43) to move outwards along the guide rail (44) by means of the conical section (42 a) of the telescopic rod (42) and the conical part (22 a) of the roller clamping base (22) until the annular groove of the small-diameter section (52 b) of the roller (52) is completely meshed with the annular groove of the nut (53), and simultaneously enabling the internal thread base (41) and the external thread section (42 b) of the telescopic rod (42) to be matched to realize self locking, so that radial movement of the roller (52) is limited;
s5, installing a retainer (54) in one side of the nut (53) and matching with the top end of the roller (52);
s6, screwing the screw rod (51) from the top end of the nut (53) to enable the screw rod to be meshed with the large-diameter section (52 c) of the roller (52) until the screw rod (51) is meshed with more than half of the ring grooves of the large-diameter section (52 c) of the roller (52), and suspending the screw rod (51) from being screwed;
s7, reversely rotating the telescopic rod (42) to enable the telescopic rod (42) to descend and take out;
s8, continuing to rotate the screw rod (51) until the screw rod (51) is completely meshed with the large-diameter section (52 c) of the roller (52);
s9, taking out the assembled differential planetary roller screw pair (50), and installing the other retainer (54) in the other side of the nut (53) to complete the assembly of the differential planetary roller screw pair (50).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311407558.7A CN117140410B (en) | 2023-10-27 | 2023-10-27 | Differential type planetary roller screw pair assembly fixture and assembly method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311407558.7A CN117140410B (en) | 2023-10-27 | 2023-10-27 | Differential type planetary roller screw pair assembly fixture and assembly method |
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| CN117140410B CN117140410B (en) | 2024-01-02 |
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| CN105437116A (en) * | 2015-12-14 | 2016-03-30 | 西北工业大学 | Assembling clamp for planet roller screw rod pair |
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| Publication number | Publication date |
|---|---|
| CN117140410B (en) | 2024-01-02 |
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