Rapid assembling method and tool for standard planetary roller lead screw pair

Abstract

The invention discloses a method for quickly assembling a standard planetary roller screw pair. An upper inner gear ring, a lower inner gear ring and a nut are rigidly connected into a combined body; the driving tool serves as a base to be connected with the lower retainer, and the nut assembly is arranged on the lower retainer; the pin rollers are arranged in uniformly distributed holes of the lower retainer and are primarily limited by using the small end of the taper limiting tool; the driving tool is fixed, the nut assembly is rotated in a reciprocating mode, the pin rollers are evenly distributed in a self-adaptive mode, meanwhile, the taper limiting tool descends, and final limiting is conducted through the large end of the taper limiting tool; the upper retainer and the upper check ring are sequentially installed, and the taper limiting tool is taken out; the driving tool and the nut assembly are overturned up and down together, the driving tool is taken out, a lower check ring is installed, and assembling of the nut assembly is completed; and the lead screw is screwed into the nut assembly, and assembling of the planetary roller lead screw pair is completed. Through a flexible or rigid connection driving mode, the rollers are rotated and equally divided in a self-adaptive mode, then the rollers which are equally divided in a self-adaptive mode are limited, and the purpose of rapid assembly is achieved.

Description

Technical Field

[0001] The invention relates to a rapid assembly method, in particular to a rapid assembly method and tooling for a standard planetary roller screw pair. Background Art

[0002] Planetary roller screw is a mechanical device that can convert rotational motion and linear motion. It is widely used in precision CNC machine tools, machining centers, modern robots, servo control systems and various types of automation equipment. It is a key component in the equipment manufacturing industry. According to its structural characteristics, it can be divided into: standard planetary roller screw, differential planetary roller screw, circulating planetary roller screw and reverse planetary roller screw.

[0003] With the continuous development and application of planetary roller screw pairs, the assembly efficiency is low in its production process and it has been difficult to break through. In particular, the problem of how to evenly position the rollers in the free state during the assembly process has been difficult to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a method and tool for quickly assembling a standard planetary roller screw pair, so as to solve the problem of low assembly efficiency of the existing standard planetary roller screw pair.

[0005] The technical solution of the present invention is a method for quickly assembling a standard planetary roller screw pair, comprising the following steps: S1: rigidly connect the upper and lower inner gear rings with nuts to form an assembly; S2: The driving fixture is connected to the lower cage as a base, and the nut assembly is placed on the lower cage; S3: The rollers are installed into the evenly distributed holes of the lower cage, and the small end of the taper limit fixture is used for initial limit; S4: Fix the driving fixture and reciprocate the nut assembly to make the rollers adaptively evenly distributed, and at the same time lower the taper limit fixture, and rely on the large end of the taper limit fixture for final limit; S5: Install the upper retainer and upper retaining ring in sequence, and take out the taper limit tooling; S6: The driving tool and the nut assembly are turned upside down together, the driving tool is taken out, and the lower retaining ring is installed to complete the assembly of the nut assembly; S7: Screw the screw into the nut assembly to complete the assembly of the planetary roller screw pair.

[0006] A tooling used in a standard planetary roller screw pair quick assembly method includes a taper limit tooling and a driving tooling, wherein the driving tooling includes a base, a positioning shoulder is provided on the base, and the two form a stepped structure, and the top surface of the positioning shoulder is evenly distributed with evenly distributed connecting bosses with the same number as the rollers. When a lower retaining frame is connected to the driving tooling, each evenly distributed connecting boss is inserted into an evenly distributed hole of the lower retaining frame, and the height of the evenly distributed connecting boss is less than the depth of the evenly distributed hole.

[0007] In the tooling used in the aforementioned method for rapid assembly of a standard planetary roller screw pair, the center of the driving tooling is a through-hole structure.

[0008] In the tooling used in the aforementioned method for rapid assembly of a standard planetary roller screw pair, the taper limiting tooling is a truncated cone structure, and a hand-held portion is provided on the back of the large end.

[0009] In the tooling used in the aforementioned method for rapid assembly of a standard planetary roller screw pair, the diameter of the large end of the taper limiting tooling is 1 mm smaller than the bottom diameter of the screw thread.

[0010] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention realizes the limiting of the lower retaining frame by driving the tooling, and then installs the lower end of the roller into the evenly distributed hole of the lower retaining frame to realize the limiting of the lower end of the roller, supports the roller outward by the tapered limiting tooling, and rotates the nut to make the roller adaptively evenly divided, thereby facilitating the installation of the upper retaining frame and then facilitating the installation of other components. The present invention drives the roller adaptively and evenly through flexible or rigid connection, and then limits the adaptively evenly divided roller, so as to achieve the purpose of rapid assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the assembly of the present invention; Figure 2 It is a structural schematic diagram of the taper limiting tooling; Figure 3 It is a schematic diagram of the structure of the driving tooling; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure.

[0012] Figure markings: 1-taper limit fixture, 2-nut, 3-upper retaining ring, 4-upper retaining frame, 5-upper inner gear ring, 6-roller, 7-lower inner gear ring, 8-lower retaining frame, 9-lower retaining ring, 10-driving fixture, 11-uniformly distributed connecting boss, 12-positioning shoulder, 13-base. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0014] An embodiment of the present invention: A method for quickly assembling a standard planetary roller screw pair, wherein a driving fixture 10 is placed on a work surface, a lower retaining frame 8 is connected to the driving fixture 10 through uniformly distributed holes, an upper inner gear ring 5 and a lower inner gear ring 7 are connected to a nut 2 to form a whole, and the whole is placed on the lower retaining frame 8, and then the lower end of the roller 6 is installed into the uniformly distributed holes of the lower retaining frame 8, and at the same time, the small end of the taper limit fixture 1 is used to extend into the nut 2 to initially limit the roller 6. In order to facilitate the installation of the roller 6, initially only the small end of the taper limit fixture 1 is used to extend into the nut 2, so as to ensure that the gap between the taper limit fixture 1 and the nut 2 is sufficient to accommodate the roller 6. After the roller 6 is installed, its lower end is inserted into the uniformly distributed holes of the lower retaining frame 8 to achieve lower end positioning. Since the taper limit fixture 1 blocks the roller 6, The inner side of roller 6 makes roller 6 upright, fix the driving tooling 10, rotate nut 2 back and forth with one hand, thereby meshing with the teeth on roller 6 through the lower inner gear ring 7, driving roller 6 to rotate. During rotation, roller 6 adaptively divides evenly, and the other hand simultaneously puts the taper limit tooling 1 downward, so that the large end of the taper limit tooling 1 is against roller 6, and roller 6 is finally limited. At this time, stop to rotate nut 2, install upper retaining frame 4 and upper retaining ring 3 into nut 2 in sequence, and the upper end of roller 6 is installed into the evenly distributed holes of upper retaining frame 4 during the installation process, take out the taper limit tooling 1, turn over nut 2 and driving tooling 10 together, remove driving tooling 10, and install lower retaining ring 9, thereby completing the assembly of nut assembly, and subsequently screwing the screw into the nut assembly can complete the entire assembly.

[0015] Among the above-mentioned parts, the nut 2, the upper retaining ring 3, the upper retaining frame 4, the upper inner gear ring 5, the roller 6, the lower inner gear ring 7, the lower retaining frame 8 and the lower retaining ring 9 are the mechanical parts of the planetary roller screw pair.

[0016] The present invention also protects a tool used in a method for quickly assembling a standard planetary roller screw pair, including a taper limit tool 1 and a drive tool 10. The drive tool 10 includes a base 13, on which a positioning shoulder 12 is provided. The two form a stepped structure. The top surface of the positioning shoulder 12 is evenly distributed with evenly distributed connecting bosses 11 having the same number as the rollers 6, wherein the base 13 plays a supporting role, the positioning shoulder 12 cooperates with the inner hole of the nut 2 to play a positioning role, and the evenly distributed connecting bosses 11 are connected to evenly distributed through holes in the lower retaining frame 8 to play a transmission role when the nut 2 is rotated. When the lower retaining frame 8 is connected to the drive tool 10, each evenly distributed connecting boss 11 is inserted into an evenly distributed hole of the lower retaining frame 8, and the height of the evenly distributed connecting boss 11 is less than the depth of the evenly distributed hole, so that the lower end of the roller 6 can be inserted into the evenly distributed hole of the lower retaining frame 8 during the installation process.

[0017] The center of the driving tool 10 is a through-hole structure, which reduces the overall weight of the driving tool 10 and facilitates transportation.

[0018] The taper limiting fixture 1 is a truncated cone structure. Figure 2 As shown, the L1 end is the small end, the L2 end is the large end, and a handle 14 is provided on the back of the large end. When in use, the handle 14 is taken out by hand, and the taper limit fixture 1 is vertically placed into the nut 2.

[0019] The diameter of the large end of the taper limiting fixture 1 is 1 mm smaller than the bottom diameter of the thread of the lead screw, so that when the large end is used for final positioning, the plurality of rollers 6 remain in a vertically evenly distributed state, making it convenient to load them into the upper retaining frame 4.

Claims

1. A method for rapid assembly of a standard planetary roller screw pair, characterized in that: The following steps are included: S1: rigidly connecting the upper and lower inner gear rings with the nut (2) to form an assembly; S2: The driving tool (10) is connected to the lower retaining frame (8) as a base, and the nut assembly is placed on the lower retaining frame (8); S3: The rollers (6) are installed into the evenly distributed holes of the lower cage (8), and the small end of the taper stopper (1) is used for initial stop. S4: The driving fixture (10) is fixed and the nut assembly is reciprocated to make the roller (6) adaptively evenly distributed, and at the same time the taper limit fixture (1) is lowered, and the final limit is performed by the large end of the taper limit fixture (1); S5: Install the upper retainer (4) and the upper retaining ring (3) in sequence, and remove the taper limit tooling (1); S6: The driving tool (10) and the nut assembly are turned upside down, the driving tool (10) is taken out, and the lower retaining ring (9) is installed to complete the assembly of the nut assembly; S7: Screw the screw into the nut assembly to complete the assembly of the planetary roller screw pair.

2. The tooling used in the method for rapid assembly of a standard planetary roller screw pair as claimed in claim 1, characterized in that: The invention comprises a taper limiting fixture (1) and a driving fixture (10), wherein the driving fixture (10) comprises a base (13), a positioning shoulder (12) is arranged on the base (13), and the two form a stepped structure, and the top surface of the positioning shoulder (12) is evenly distributed with evenly distributed connecting bosses (11) having the same number as the rollers (6), and when the lower retaining frame (8) is connected to the driving fixture (10), each evenly distributed connecting boss (11) is inserted into an evenly distributed hole of the lower retaining frame (8), and the height of the evenly distributed connecting boss (11) is less than the depth of the evenly distributed hole.

3. The tooling used in the method for rapid assembly of a standard planetary roller screw pair according to claim 2, characterized in that: The center of the driving tool (10) is a through-hole structure.

4. The tooling used in the method for rapid assembly of a standard planetary roller screw pair according to claim 2, characterized in that: The taper limiting tool (1) is a truncated cone structure, and a hand-held portion (14) is provided on the back of the large end.

5. The tooling used in the method for rapid assembly of a standard planetary roller screw pair according to claim 4, characterized in that: The diameter of the large end of the taper limiting tool (1) is 1 mm smaller than the thread bottom diameter of the lead screw.

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