A hand reversing device for a nut screw pair

Abstract

The utility model relates to a reversing device, concretely relates to a manual reversing device of nut screw rod pair nut. The reversing device is constituted by spacing sleeve and connecting piece, and the both ends of spacing sleeve are respectively provided with connecting piece. The reversing device is simple in structure, convenient to use, can reverse nut after transferring nut and steel ball to spacing sleeve, always assembles steel ball in nut through spacing sleeve, makes steel ball not easy to separate from nut, thereby need not reassemble steel ball in the nut reversing process, can omit the process of reassembling steel ball, effectively simplifies the reversing process of nut on screw rod, effectively reduces the labor intensity, and improves test efficiency, speeds up the production rhythm. Solveed the problem that steel ball needs to be reassembled in the existing nut screw rod pair nut reversing test process, leads to the problem of great labor intensity and low test efficiency. Especially suitable for nut screw rod pair nut reversing test use.

Description

Technical Field

[0001] This utility model relates to a reversing device, specifically a manual reversing device for a nut screw pair nut. Background Technology

[0002] Existing automotive power steering assemblies have incorporated electric power assist mechanisms due to product upgrades. In some cases, this electric power assist mechanism directly acts on the rack end, i.e., the REPS electric power steering system. The rack end assistance is achieved by a motor driving a nut via a synchronous belt. The nut, in conjunction with a lead screw located at the rack end, directly assists in loading the rack and assisting its movement. To reduce friction and wear between the nut and lead screw, a circulating steel ball system is used. This circulating steel ball transforms the traditional sliding friction between the nut and lead screw into rolling friction between the steel ball and both the lead screw and nut, effectively reducing friction and wear and improving the durability of the nut-lead screw pair. Because ball screw-nut pair testing is involved (such as testing the axial slip distance between the nut and lead screw), it is sometimes necessary to reverse the direction of the nut on the lead screw. If the nut is directly removed from the lead screw for reversal, the steel balls are prone to falling out of the nut. Therefore, it is necessary to collect the steel balls between the nut and lead screw and reassemble them after reversing the nut. The process of reassembling the steel balls is not only labor-intensive but also leads to decreased testing efficiency and affects production cycle time. Therefore, it is necessary to design a manual reversing device for the nut of the lead screw pair to solve the above problems. Summary of the Invention

[0003] The purpose of this utility model is to provide a manual reversing device for the nut of the nut screw pair that can quickly reverse the direction of the nut, effectively reduce labor intensity, and improve testing efficiency.

[0004] The technical solution of this utility model is: A manual reversing device for a nut on a lead screw assembly comprises a limiting sleeve and connecting parts, characterized in that: the two ends of the limiting sleeve are respectively provided with connecting parts for connecting the lead screw.

[0005] The connector consists of a connector head and a plug. A limiting countersunk hole is provided on the end face of the connector head, and a plug is inserted into the center of the limiting countersunk hole. The plug is fixedly connected to the connector head by a locking bolt. The connector head is threadedly connected to the limiting sleeve.

[0006] The outer end of the limiting sleeve is cylindrical, and the outer diameter of the limiting sleeve is between 0.85 times the diameter of the outer end of the limiting sleeve and 1 times the diameter of the outer end of the limiting sleeve.

[0007] The connector has a connecting flange on the outer plug end.

[0008] Furthermore, the plug is 3-5cm long.

[0009] The beneficial effects of this utility model are as follows: This manual reversing device for the nut of a lead screw assembly is simple in structure and easy to use. It transfers the nut and steel ball to a limiting sleeve for nut reversal. The limiting sleeve keeps the steel ball fully assembled in the nut, preventing it from easily detaching. This eliminates the need for reassembly of the steel ball during nut reversal, effectively simplifying the nut reversal process on the lead screw, reducing labor intensity, improving testing efficiency, and accelerating production. It solves the problem of high labor intensity and low testing efficiency caused by the need for reassembly of the steel ball in existing lead screw assembly nut reversal testing. It is particularly suitable for nut reversal testing of lead screw assemblies. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the connector of this utility model; Figure 3 This is a schematic diagram of the usage state of this utility model.

[0011] In the diagram: 1. Limiting sleeve, 2. Connector, 3. Plug, 4. Limiting countersunk hole, 5. Locking bolt, 6. Connecting flange, 7. Nut, 8. Steel ball, 9. Lead screw. Detailed Implementation

[0012] The manual reversing device for the nut on the lead screw assembly consists of a limiting sleeve 1 and connecting parts. The two ends of the limiting sleeve 1 are respectively provided with connecting parts for connecting the lead screw. After the connecting parts are connected to the ends of the lead screw, the limiting sleeve 1 is aligned with the ends of the lead screw, allowing the nut to transition from the lead screw to the limiting sleeve 1. The direction of the nut can be easily changed through the limiting sleeve 1. Furthermore, when changing the nut's direction, the limiting sleeve 1 limits the steel ball inside the nut, keeping the steel ball between the limiting sleeve 1 and the nut, maintaining the relative position of the nut and the steel ball. The nut can be reversed without disassembling the steel ball. Compared to the current method of disassembling and then reassembling the steel ball to reverse the nut, this eliminates the process of disassembling and reassembling the steel ball, effectively reducing labor intensity, improving the nut reversing efficiency, and thus improving testing efficiency and effectively accelerating the generation cycle.

[0013] The connector consists of a connector head 2 and a plug 3. A limiting countersunk hole 4 is provided on the end face of the connector head 2, allowing it to be fitted onto the end of the lead screw. The limiting countersunk hole 4 restricts the position of the connector head 2 from the outside of the lead screw, thereby limiting the position of the limiting sleeve 1, ensuring that the limiting sleeve 1 aligns with the lead screw. A plug 3 is inserted into the center of the limiting countersunk hole 4, allowing it to be inserted into the center hole of the lead screw. The plug 3, inserted into the center hole of the lead screw, limits the position of the connector, thereby limiting the position of the limiting sleeve 1. Combined with the limiting countersunk hole 4, the limiting sleeve 1 is fixed to the end of the lead screw, ensuring that the limiting sleeve 1 aligns with the lead screw through the connector. The plug 3 is fixedly connected to the connector head 2 by a locking bolt 5; the connector head 2 and the limiting sleeve 1 are threaded together. The limiting sleeve 1, connector 2, and plug 3 are detachable from each other, allowing for the replacement of connector 2 or plug 3. When the specifications of the lead screw to be tested change, replacing the matching connector 2 or plug 3 ensures stable connection between the limiting sleeve 1 and the lead screw. Furthermore, if any component of the limiting sleeve 1, connector 2, or plug 3 wears out, replacing the worn component allows the device to be put back into use, effectively reducing maintenance costs compared to replacing the entire reversing device.

[0014] The outer end of the connecting head on the outside of the limiting sleeve 1 is cylindrical. The outer diameter of the limiting sleeve 1 is between 0.85 times the diameter of the connecting head 2 on the outside of the limiting sleeve 1 and 1 times the diameter of the connecting head 2 on the outside of the limiting sleeve 1 (inclusive). The connecting head 2 matches the end of the lead screw, that is, the diameter of the connecting head 2 matches the diameter of the lead screw, allowing the steel ball to pass through the connecting head 2. When the outer diameter of the limiting sleeve 1 is too large, exceeding 1 times the diameter of the connecting head 2 on the outside of the limiting sleeve 1, the steel ball cannot enter between the nut and the limiting sleeve 1. Therefore, the outer diameter of the limiting sleeve 1 cannot exceed 1 times the diameter of the connecting head 2 on the outside of the limiting sleeve 1. When the outer diameter of the limiting sleeve 1 is slightly smaller than the diameter of the connector 2 outside the limiting sleeve 1, although the gap between the limiting sleeve 1 and the nut increases, the steel ball will not fall out between the limiting sleeve 1 and the nut when the gap between the limiting sleeve 1 and the nut is smaller than the diameter of the steel ball. Therefore, it is advisable that the outer diameter of the limiting sleeve 1 is slightly smaller than the diameter of the connector 2 outside the limiting sleeve 1, with the outer diameter of the limiting sleeve 1 being greater than 0.85 times the diameter of the connector 2 outside the limiting sleeve 1.

[0015] The plug 3 on the outer side of the connector 2 is provided with a connecting flange 6, which abuts against the inner wall of the center hole of the lead screw. The connecting flange 6 reduces the friction area between the plug 3 and the inner wall of the center hole of the lead screw, thereby reducing the wear of the connecting flange 6 and enhancing the durability of the plug 3.

[0016] The length of plug 3 is 3-5cm. If plug 3 is inserted too shallowly into the center hole of the lead screw, the connection between plug 3 and the lead screw will be unstable; if plug 3 is too long, it will cause the connector to be too heavy, which in turn will make the device too heavy. Therefore, plug 3 should not be too long or too short, and the length of plug 3 should be 3-5cm.

[0017] The manual reversing device for the nut on the lead screw assembly involves connecting the connector at one end of the limiting sleeve 1 to the end of the lead screw when the nut needs to be reversed. The plug 3 of the connector is inserted into the center hole of the lead screw, and the limiting countersunk hole 4 of the connector head 2 is fitted onto the end of the lead screw. After the connector is connected, the nut is rotated to move it from the lead screw to the limiting sleeve 1. After the nut is completely disengaged from the lead screw, the limiting sleeve 1 and the nut are disengaged from the lead screw. The limiting sleeve 1 is reversed, and the connector at the other end of the limiting sleeve 1 is connected to the end of the lead screw. After the limiting sleeve 1 is connected, the nut is rotated onto the lead screw, completing the nut reversal.

[0018] This manual reversing device for the nut of a lead screw assembly is simple in structure and easy to use. It transfers the nut and steel ball to a limiting sleeve for nut reversal. The limiting sleeve keeps the steel ball fully assembled in the nut, preventing it from easily detaching. This eliminates the need for reassembly of the steel ball during nut reversal, effectively simplifying the nut reversal process on the lead screw, reducing labor intensity, improving testing efficiency, and accelerating production. It solves the problem of high labor intensity and low testing efficiency caused by the need for reassembly of the steel ball in existing lead screw assembly nut reversal testing. It is particularly suitable for nut reversal testing of lead screw assemblies.

Claims

1. A manual reversing device for a nut on a lead screw, comprising a limiting sleeve (1) and a connecting member, characterized in that: The two ends of the limiting sleeve (1) are respectively provided with connecting parts for connecting the lead screw.

2. The manual reversing device for a nut screw pair nut according to claim 1, characterized in that: The connector consists of a connector (2) and a plug (3). A limiting countersunk hole (4) is provided on the end face of the connector (2). The plug (3) is inserted into the center of the limiting countersunk hole (4). The plug (3) is fixedly connected to the connector (2) by a locking bolt (5). The connector (2) is threadedly connected to the limiting sleeve (1).

3. The manual reversing device for a nut screw pair nut according to claim 2, characterized in that: The outer end of the connecting head of the limiting sleeve (1) is cylindrical, and the outer diameter of the limiting sleeve (1) is between 0.85 times the diameter of the connecting head (2) on the outer side of the limiting sleeve (1) and 1 times the diameter of the connecting head (2) on the outer side of the limiting sleeve (1).

4. The manual reversing device for the nut of a lead screw pair according to claim 2, characterized in that: The connector (2) has a connecting flange (6) on the plug (3) end outside.

5. The manual reversing device for the nut of a lead screw pair according to claim 4, characterized in that: The plug (3) is 3-5cm long.

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