Single-helicoid planetary roller spiral jacking device

Abstract

A single-helicoid planetary roller spiral jacking device comprises a first rotating disc 10 and a second rotating disc 20, the first rotating disc is provided with first conical surface spiral teeth 11, the second rotating disc is provided with a second conical surface 21, a conical roller 30 is arranged between the first rotating disc 10 and the second rotating disc 20, the conical roller is provided with roller ring teeth 31 meshed with the first conical surface spiral teeth 11, and the roller ring teeth 31 are meshed with the first conical surface spiral teeth 11. The first rotating disc 10 and the second rotating disc 20 coaxially and relatively rotate, and the conical roller 30 rolls on the first conical surface spiral teeth 11 and the second conical surface 21. The first rotating disc provided with the first conical surface spiral teeth is adopted, the conical rollers are provided with the annular teeth meshed with the first conical surface spiral teeth, radial asynchronous movement of the multiple conical rollers can be avoided, the conical rollers are accurately kept in the radial position, and jacking loads can be evenly borne; in addition, sliding between the conical pin roller and the first rotating disc can be avoided, the operation effect is improved, the pin roller retainer structure provided with the pin roller sliding frame is adopted, the diameter of the conical pin roller is not limited by the retainer mechanism, and the structural design of the conical pin roller can be optimized.

Description

Technical Field

[0001] The utility model belongs to a jacking device, in particular to a single-helical-surface planetary roller screw jacking device. Background Art

[0002] In the fields of industrial production, engineering construction and scientific research, it is often necessary to fine-tune the position of equipment and components, and the need to apply top pressure within a smaller adjustment range is very common. For example, in the industrial field, the level and gap of equipment are adjusted; in order to improve the heavy-load adjustment and precision adjustment performance of the top pressure device, the Chinese invention patent (application number 2017109060463) discloses a planetary rolling micro-pitch top pressure device, the technical solution of which adopts a planetary thread roller with a tapered thread, and the tapered thread of the planetary thread roller rolls in contact with the annular tooth groove of the turntable and the top plate, pushing the top plate to do a slight lift; the use of a rolling structure can reduce the friction during operation, avoid mechanical creeping, and improve the heavy-load adjustment and precision adjustment performance of the top pressure device. However, affected by factors such as operating conditions, the above technical solution may produce radial asynchronous movement of multiple planetary thread rollers, so that multiple planetary thread rollers cannot evenly bear the pressure load, and even cause the device to lose stability. The above technical solution also uses a roller shaft to connect the planetary thread roller and the retaining frame. When the diameter of the planetary thread roller is small, the diameter of the roller shaft is limited, and its rigidity and strength will be affected. Using a planetary thread roller with a larger diameter will increase the structural size of the device. Summary of the invention

[0003] The utility model aims to provide a single-helical-surface planetary roller spiral jacking device, and improve the structure and performance of the planetary rolling jacking device.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a single-helical planetary roller spiral top pressure device, comprising a first turntable 10 and a second turntable 20, the first turntable is provided with a first conical spiral tooth 11, the second turntable is provided with a second conical surface 21, a conical roller 30 is provided between the first turntable 10 and the second turntable 20, the conical roller is provided with a roller ring tooth 31 meshing with the first conical spiral tooth 11, the first turntable 10 and the second turntable 20 rotate coaxially relative to each other, and the conical roller 30 rolls on the first conical spiral tooth 11 and the second conical surface 21.

[0005] Furthermore, in order to reduce the contact stress between the tooth top of the roller ring tooth 31 and the second conical surface 21 , a conical surface 32 adapted to the second conical surface 21 is provided at the top of the roller ring tooth 31 .

[0006] Furthermore, in order to make the pressing device have good structural stability, at least three tapered rollers 30 are provided between the first turntable 10 and the second turntable 20, and the tapered rollers 30 are equally distributed around the circumference of the rotation axis of the first turntable and the second turntable.

[0007] Furthermore, in order to make multiple tapered rollers 30 move synchronously and maintain a set spacing, a roller retainer 40 is provided between the first turntable 10 and the second turntable 20, and the roller retainer 40 is provided with a roller slide groove 41, and a roller slide 42 is provided in the roller slide groove 41, and the roller slide is provided with a roller groove 43. The tapered roller 30 is arranged in the roller groove 43, and the roller slide 42 moves in the roller slide groove 41, and the roller slide 42 moves in a direction perpendicular to the rotation axis of the first turntable and the second turntable.

[0008] Furthermore, in order to enable the roller slide 42 to move stably in the roller slide groove 41, the roller slide groove 41 of the roller retainer is provided with a slide guide groove 44, and the roller slide 42 is provided with a slide rail 45, and the slide rail 45 is slidably matched with the slide guide groove 44.

[0009] Furthermore, in order to prevent the roller slide groove 41 from slipping out of the roller cage 40 , a cage ring 46 is provided on the outer diameter of the roller cage 40 .

[0010] The beneficial effects of the utility model are as follows: a first turntable provided with first conical spiral teeth is adopted, and a conical roller is provided with an annular tooth meshing with the first conical spiral teeth, which can avoid radial asynchronous movement of multiple conical rollers, so that the conical rollers can accurately maintain radial positions and can evenly bear the top pressure load, and can also avoid sliding between the conical rollers and the first turntable, thereby improving the operating effect. A roller retainer structure provided with a roller slide is adopted, and the diameter of the conical roller is not limited by the retainer mechanism, so the structural design of the conical roller can be optimized.

[0011] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model, the first conical surface spiral teeth and the second conical surface are inner convex structures;

[0013] Figure 2 This is a structural diagram of the utility model, which hides the second rotating disk and the retaining ring sleeve;

[0014] Figure 3 It is a structural exploded diagram of the utility model;

[0015] Figure 4 It is a cross-sectional view of the utility model;

[0016] Figure 5 It is a distribution diagram of the tapered rollers of the utility model on the spiral teeth of the first cone surface;

[0017] Figure 6 It is a schematic diagram of the motion state of the utility model;

[0018] Figure 7 It is a cross-sectional view of the utility model, and the first conical spiral teeth and the second conical surface are concave structures. DETAILED DESCRIPTION

[0019] Embodiment 1:

[0020] like Figures 1 to 6 A single-helical planetary roller screw top pressing device includes a first turntable 10 and a second turntable 20, and a tapered roller 30 is arranged between the first turntable 10 and the second turntable 20.

[0021] The outer end surface 12 of the first rotating disk 10 is a plane perpendicular to the axis, and the inner end surface of the first rotating disk 10 is provided with a first conical spiral tooth 11. Figure 3 , Figure 4 As shown, the first conical spiral tooth 11 is a conical spiral tooth with a raised center, and the first conical spiral tooth 11 gradually rises from the outside to the inside, so that the inner end surface of the first rotating disk 10 forms a conical tooth surface. Figure 5 As shown, the first conical spiral tooth 11 is a spiral line structure in the end surface direction. The tooth shape of the first conical spiral tooth 11 is a triangular tooth shape.

[0022] The outer end surface 22 of the second rotating disk 20 is a plane perpendicular to the axis, and the inner end surface of the second rotating disk 20 is a second conical surface 21. The second conical surface 21 is a conical surface with a central protrusion. The cone angle α2 of the second conical surface 21 is equal to the conical tooth surface angle α1 of the first conical spiral tooth 11. Figure 4 shown.

[0023] The small end of the tapered roller faces the center of the first rotating disk and the second rotating disk. The taper α3 of the tapered roller 30 is adapted to the cone angle α2 of the second conical surface 21 and the cone angle α1 of the conical tooth surface of the first rotating disk 10, that is, (α1+α2) / 2+α3=180°. The tapered roller 30 is provided with a roller ring tooth 31 meshing with the first conical surface helical tooth 11. The roller ring tooth 31 is a multi-turn annular tooth (non-helical tooth). The roller ring tooth 31 meshes with the first conical surface helical tooth 11, and the tooth top of the roller ring tooth 31 contacts the second conical surface 21. The top of the roller ring tooth 31 is provided with a conical surface 32 adapted to the second conical surface 21 to reduce the contact stress between the tooth top of the roller ring tooth 31 and the second conical surface 21.

[0024] In order to make the top pressure device have good structural stability, at least three tapered rollers 30 should be provided between the first turntable 10 and the second turntable 20, and the number of tapered rollers 30 can be flexibly set as needed, such as increasing the number of tapered rollers 30 when the load-bearing capacity needs to be increased. In the present embodiment, four tapered rollers 30 are provided, and each tapered roller 30 is equally distributed around the circumference of the rotation axis C of the first turntable and the second turntable, and the axis of the tapered roller 30 intersects the rotation axis C of the first turntable 10 and the second turntable 20 at right angles. In order to ensure the symmetrical structure of the first turntable 10 and the second turntable 20, and to make the tapered roller 30 well matched with the first turntable 10 and the second turntable 20, the outer diameters of the four tapered rollers are different. Figure 5 As shown, the four tapered rollers are marked as 3a, 3b, 3c, and 3d, respectively. The diameters of the large ends of the tapered rollers are da, db, dc, and dd, respectively. The four tapered rollers are distributed along the first conical spiral teeth 11 of the vortex line structure. The tapered roller 3a is arranged at the position farthest from the center of the first turntable 10; the tapered roller 3b is closer to the center of the first turntable 10 than the tapered roller 3a, and the large end diameter db of the tapered roller 3b is smaller than the large end diameter da of the tapered roller 3a; the tapered roller 3c is closer to the center of the first turntable 10 than the tapered roller 3b, and the large end diameter dc of the tapered roller 3c is smaller than the large end diameter db of the tapered roller 3b; the tapered roller 3d is closer to the center of the first turntable 10 than the tapered roller 3c, and the large end diameter dd of the tapered roller 3d is smaller than the large end diameter dc of the tapered roller 3c.

[0025] The first turntable 10 is provided with a central axis 13 at the center, and the second turntable is provided with a central hole 23 that is rotatably matched with the central axis 13. The first turntable 10 and the second turntable 20 rotate relative to each other coaxially. As a spiral top pressure device, the outer end surface 12 of the first turntable and the outer end surface 22 of the second turntable bear pressure, and the tapered roller 30 is subjected to pressure from the first turntable and the second turntable. When the first turntable 10 and the second turntable 20 rotate relative to each other, the tapered roller 30 rolls on the first conical spiral teeth 11 and the second conical surface 21, and performs planetary motion around the center of the first turntable 10 and the second turntable 20. When the tapered roller 30 rolls on the first turntable, the tapered roller 30 moves along the first conical spiral teeth 11, that is, moves along the vortex line, and generates displacement close to or away from the rotation axis. When the tapered roller 30 displaces in a direction close to the rotation axis, the first turntable 10 and the second turntable 20 are pushed to separate axially under the action of the conical surface. Figure 6 As shown, the tapered roller 30 can push the second rotating disk 20 to move upward to achieve the pressing function. Conversely, when the tapered roller 30 moves away from the rotation axis, the second rotating disk 20 falls back toward the direction close to the first rotating disk 10 to achieve the reset of the pressing device.

[0026] In order to make multiple tapered rollers 30 move synchronously and maintain a set spacing, a roller cage 40 is provided between the first turntable 10 and the second turntable 20. The roller cage 40 is provided with a roller slide 41, and the direction of the roller slide 41 is perpendicular to the rotation axis C of the first turntable and the second turntable.

[0027] A roller slide 42 is provided in the roller slide 41. The roller slide 42 moves along the roller slide. The roller slide is provided with a roller groove 43. The size of the roller groove 43 is adapted to the tapered roller 30. In this embodiment, the roller grooves 43 of the four roller slides are adapted to the four tapered rollers (3a, 3b, 3c, 3d) respectively. The tapered roller 30 is arranged in the roller groove 43. When the tapered roller 30 moves toward or away from the rotation axis, the roller slide 42 is pushed to move in the roller slide 41. The roller slide 42 moves in a direction perpendicular to the rotation axis of the first turntable and the second turntable. The roller slide 42 keeps multiple tapered rollers 30 synchronized during the planetary motion.

[0028] In order to enable the roller slide 42 to move stably in the roller slide groove 41 , the roller slide groove 41 of the roller retainer is provided with a slide guide groove 44 , and the roller slide 42 is provided with a slide guide rail 45 , and the slide guide rail 45 is slidably matched with the slide guide groove 44 .

[0029] In order to prevent the roller guide groove 41 from slipping out of the roller cage 40 , a cage ring 46 is provided on the outer diameter of the roller cage 40 .

[0030] In this embodiment, the first turntable 10 is disposed below the second turntable 20. Alternatively, a design scheme in which the first turntable 10 is disposed above the second turntable 20 may be adopted to obtain the same technical effect.

[0031] In this embodiment, the first turntable 10 is provided with a central axis 13, and the second turntable is provided with a central hole 23. Similarly, the second turntable can be provided with a central axis, and the first turntable can be provided with a central hole to obtain the same technical effect.

[0032] As a further solution, the cone angle α2 of the second conical surface 21 is not equal to the cone tooth surface angle α1 of the first conical spiral tooth 11, and the taper α3 of the tapered roller 30 is adapted to the cone angle α2 of the second conical surface 21 and the cone angle α1 of the conical tooth surface of the first turntable 10, that is, (α1+α2) / 2+α3=180°. It is also possible to adopt a solution in which the first conical spiral tooth 11 adopts a conical tooth surface structure and the second conical surface 21 adopts a plane structure, and the taper α3 of the tapered roller 30 is adapted to the plane of the second conical surface 21 and the cone angle α1 of the conical tooth surface of the first turntable 10, that is, (α1+180°) / 2+α3=180°.

[0033] Embodiment 2:

[0034] like Figure 7 , a single helical planetary roller screw top pressing device, this embodiment is a structural replacement of the first embodiment, comprising a first turntable 10 and a second turntable 20, with a tapered roller 30 disposed between the first turntable 10 and the second turntable 20. The inner end surface of the first turntable 10 is provided with a first conical surface helical tooth 11, and the inner end surface of the second turntable 20 is a second conical surface 21.

[0035] In this embodiment, the first conical spiral tooth 11 is a conical spiral tooth with a concave center, and the first conical spiral tooth 11 gradually rises from the inside to the outside, so that the inner end surface of the first rotating disk 10 forms a conical tooth surface. The second conical surface 21 is a conical surface with a concave center, and the second conical surface 21 gradually rises from the inside to the outside. The large end of the tapered roller 30 faces the center of the first rotating disk and the second rotating disk.

[0036] In the prior art (such as the patent of application number 2017109060463), the planetary thread roller is provided with a tapered thread, and the turntable and the top plate are provided with an annular tooth groove. Each planetary thread roller can generate radial displacement (i.e., movement in the direction of the axis of rotation of the turntable) when rotating. In the process of repeated movement of the planetary thread roller, it is difficult to ensure that multiple planetary thread rollers rotate completely synchronously, and the radial movement of multiple planetary thread rollers may be asynchronous, so that multiple planetary thread rollers cannot be evenly kept in contact with the turntable and the top plate, and multiple planetary thread rollers cannot evenly bear the pressure load, and the device will lose stability. In order to overcome this technical problem, the prior art adopts a structure in which the turntable and the top plate are provided with a synchronous toothed disk, and the planetary thread roller is provided with a synchronous gear. On the one hand, this increases the structural complexity and manufacturing cost of the device. On the other hand, since the planetary thread rollers will generate radial movement relative to the turntable and the top plate (equivalent to the first turntable 10 and the second turntable 20 in the utility model) during the movement of the device, it is difficult for the toothed disk and the gear to maintain a good meshing and transmission effect, and it is also difficult to ensure the accurate synchronous movement of multiple planetary thread rollers.

[0037] In the structure of the utility model, the first rotating disk is provided with conical spiral teeth, and the conical roller is provided with annular teeth. The self-rotation of the conical roller does not cause radial displacement, and radial displacement will only occur when the conical roller rolls along the first conical spiral teeth (planetary motion). The position of the conical roller on the first conical spiral teeth determines the position of its radial displacement. Since the roller cage 40 defines the relative position of each conical roller, multiple conical rollers (equivalent to the planetary threaded rollers in the prior art) can maintain synchronous radial displacement.

[0038] In the prior art, the planetary threaded roller is provided with a roller shaft, and the planetary threaded roller is mounted on the planetary roller cage through the roller shaft. Such a structure requires the planetary roller cage to have sufficient thickness to assemble the roller shaft, which increases the overall axial size of the device. The utility model adopts a roller cage 40 provided with a roller slide 42, so that the roller cage can be made as small as possible, making the structure of the device more compact.

[0039] The planetary roller screw top pressing device has good mechanical properties. The plane planetary roller screw top pressing structure has the characteristics of high precision. Its parameters such as roller diameter and thread tolerance are precisely processed and controlled, which can achieve high-precision movement and positioning. The plane planetary roller screw top pressing structure has the characteristics of long life, and its wear resistance and fatigue resistance are very good. It can maintain stable performance in harsh working environments and reduce the frequency of maintenance and replacement. The plane planetary roller screw top pressing structure has the characteristics of low friction, and its friction coefficient is very small, which can reduce energy loss and heat generation, thereby improving the efficiency and stability of the mechanical system. When the plane planetary roller screw top pressing structure is transmitted, the roller mainly bears the pressure in its own radial direction, and the meshing thread and ring groove bear the force component along the cone surface. Therefore, it has better load-bearing capacity and stronger impact resistance, which can meet the application requirements of ultra-high load and high speed. Its load-bearing capacity is far better than that of the common planetary roller screw structure, because the thread of the planetary roller screw must bear all the axial external load forces. The planar planetary roller screw top pressure structure has strong adaptability, and its structural design and parameter selection can adapt to different application scenarios and mechanical system requirements. For example, for some special occasions that require high-precision positioning, the planar planetary roller screw structure can meet its requirements through special design and processing. It is suitable for working conditions requiring ultra-high load, high precision, low friction, low torque, long life, etc. under narrow, circular, high and other space-constrained conditions.

Claims

1. A single-helical planetary roller screw top pressing device, characterized in that: The invention comprises a first rotating disk (10) and a second rotating disk (20), wherein the first rotating disk is provided with a first conical spiral tooth (11), and the second rotating disk is provided with a second conical surface (21). A conical roller (30) is provided between the first rotating disk (10) and the second rotating disk (20), and the conical roller is provided with a roller ring tooth (31) meshing with the first conical spiral tooth (11). The first rotating disk (10) and the second rotating disk (20) rotate coaxially relative to each other, and the conical roller (30) rolls on the first conical spiral tooth (11) and the second conical surface (21).

2. The single helical planetary roller screw pressing device according to claim 1, characterized in that: A conical surface (32) adapted to the second conical surface (21) is provided at the top of the roller ring tooth (31).

3. The single helical planetary roller screw pressing device according to claim 1, characterized in that: At least three tapered rollers (30) are arranged between the first rotating disk (10) and the second rotating disk (20), and the tapered rollers (30) are equally distributed around the circumference of the rotation axis of the first rotating disk and the second rotating disk.

4. The single helical planetary roller screw pressing device according to claim 1, characterized in that: A roller retainer (40) is provided between the first turntable (10) and the second turntable (20); the roller retainer (40) is provided with a roller slide groove (41); a roller slide (42) is provided in the roller slide groove (41); the roller slide is provided with a roller groove (43); the tapered roller (30) is arranged in the roller groove (43); the roller slide (42) moves in the roller slide groove (41); and the roller slide (42) moves in a direction perpendicular to the rotation axis of the first turntable and the second turntable.

5. The single helical surface planetary roller screw pressing device according to claim 4, characterized in that: The roller slide groove (41) of the roller retainer is provided with a slide guide groove (44), the roller slide (42) is provided with a slide guide rail (45), and the slide guide rail (45) is slidably matched with the slide guide groove (44).

6. The single helical planetary roller screw pressing device according to claim 4, characterized in that: The outer diameter of the roller retainer (40) is provided with a retainer ring sleeve (46).

7. The single helical planetary roller screw pressing device according to claim 1, characterized in that: The first conical spiral tooth (11) is a conical spiral tooth with a central protrusion, and the second conical surface (21) is a conical surface with a central protrusion.

8. The single helical surface planetary roller screw pressing device according to claim 1, characterized in that: The first conical spiral tooth (11) is a conical spiral tooth with a concave center, and the second conical surface (21) is a conical surface with a concave center.

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