CN114985847A

CN114985847A - Roll and insert system tooth positioning clearance and subduct device

Info

Publication number: CN114985847A
Application number: CN202210832320.8A
Authority: CN
Inventors: 祝国荣; 薛建琪; 国旭华; 王森; 张祚炜; 林岩; 孙力; 张丽华
Original assignee: Beijing North Vehicle Group Corp
Current assignee: Beijing North Vehicle Group Corp
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-09-02

Abstract

The invention provides a roll-inserting tooth-making positioning gap reduction device which comprises a positioning shaft, a tooth blank, a positioning sleeve, an opening pressing plate, a fastening nut and a dismounting nut. When the positioning shaft is used, the screw thread of the nut along the lower section of the stepped shaft of the positioning shaft is disassembled, and the nut is screwed down to be lower than the axial positioning surface; inserting the positioning sleeve into the middle section of the stepped shaft of the positioning shaft, and sleeving the gear blank on the positioning sleeve; and inserting an opening pressing plate into the upper section of the stepped shaft of the positioning shaft, and screwing a fastening nut. After the gear blank is inserted and rolled to form the gear, loosening the fastening nut and drawing out the opening pressing plate; and (4) upwards rotating the dismounting nut to jack up the gear blank and take away the gear blank. This device increases a position sleeve of taking the steel ball between location axle and tooth base hole, can be under the prerequisite that does not improve tooth base manufacturing accuracy, according to product precision and production demand, selects the cooperation of adaptation, realizes the improvement of gear tooth portion manufacturing accuracy and machining efficiency, satisfies the production demand. Meanwhile, the device has the advantages of simple structure, light weight and low manufacturing cost.

Description

Roll and insert system tooth positioning clearance and subduct device

Technical Field

The invention belongs to the technical field of gear manufacturing processes, and particularly relates to a roll-insert gear manufacturing positioning clearance reducing device.

Background

In the gear rolling and inserting process, a method which is usually adopted is to directly mount a gear on a positioning shaft. Due to the fact that the tolerance of the gear positioning hole exists, when large-batch processing is carried out, the gap between the gear positioning hole and the positioning shaft is different, clamping is time-consuming and labor-consuming when the gap is too small, gear radial jumping precision is poor when the gap is too large, and production requirements cannot be met. Therefore, it is necessary to develop a device for reducing the positioning clearance in the gear hobbing process to improve the gear manufacturing accuracy and efficiency.

Disclosure of Invention

Technical problem to be solved

The invention provides a roll-insert tooth-making positioning clearance reduction device, which aims to solve the technical problems that the clearance between a positioning shaft and a hole influences the manufacturing precision of a gear and the gear is inconvenient to clamp in the roll-insert tooth-making process.

(II) technical scheme

In order to solve the technical problem, the invention provides a positioning clearance reducing device for a rolling insertion tooth, which comprises a positioning shaft, a tooth blank, a positioning sleeve, an opening pressing plate, a fastening nut and a dismounting nut; wherein the content of the first and second substances,

the positioning shaft comprises a supporting seat and a positioning part positioned above the supporting seat, and the positioning part comprises a three-section stepped shaft consisting of an upper section, a middle section and a lower section; the outer diameter of the upper section of the stepped shaft is smaller than that of the middle section, and threads are machined on the surface of the upper section; the outer diameter of the middle section of the stepped shaft is smaller than that of the lower section, the outer diameter of the lower section is larger than that of the positioning hole of the gear blank, the outer diameter difference between the lower section and the middle section forms an axial positioning surface of a step structure for axially positioning the gear blank, and threads are machined on the surface of the lower section;

the dismounting nut is arranged at the lower section of the stepped shaft; the positioning sleeve is arranged at the middle section of the stepped shaft, and the gear blank is sleeved at the outer side of the positioning sleeve; the opening pressing plate and the fastening nut are sequentially arranged on the upper section of the stepped shaft; the lower surface of the fastening nut is connected with the upper surface of the opening pressing plate, the lower surface of the opening pressing plate is connected with the upper surface of the gear blank, and the lower surface of the gear blank is connected with the axial positioning surface.

Furthermore, the locating sleeve consists of a steel ring and a plurality of steel balls embedded on the steel ring, and the steel balls can freely rotate and radially move in the embedding holes and cannot fall off.

Further, the steel balls inlaid on the positioning sleeve are uniformly arranged along the axial direction and the circumferential direction, wherein the circumferential quantity is larger than three groups, and the axial arrangement quantity is not smaller than two groups.

Furthermore, the steel balls with small diameters are embedded at the upper end of the steel ring and gradually increase downwards, and the steel balls with the largest diameters are embedded at the lower end of the steel ring, so that a taper structure is formed.

Further, the diameter difference of the upper steel ball and the lower steel ball is 0.01 mm.

Further, the diameter difference of the steel balls in the same row is not more than 0.002 mm.

(III) advantageous effects

The invention provides a roll-inserting tooth-making positioning gap reduction device which comprises a positioning shaft, a tooth blank, a positioning sleeve, an opening pressing plate, a fastening nut and a dismounting nut. When the positioning shaft is used, the screw thread of the nut along the lower section of the stepped shaft of the positioning shaft is disassembled, and the nut is screwed down to be lower than the axial positioning surface; inserting the positioning sleeve into the middle section of the stepped shaft of the positioning shaft, and sleeving the gear blank on the positioning sleeve; and inserting an opening pressing plate into the upper section of the stepped shaft of the positioning shaft, and screwing a fastening nut. After the gear blank is inserted and rolled to form the gear, loosening the fastening nut and drawing out the opening pressing plate; and the nut is rotated upwards to disassemble, the gear blank is jacked up, and the gear blank is taken away. This device increases a position sleeve of taking the steel ball between location axle and tooth base hole, can be under the prerequisite that does not improve tooth base manufacturing accuracy, according to product precision and production demand, selects the cooperation of adaptation, realizes the improvement of gear tooth portion manufacturing accuracy and machining efficiency, satisfies the production demand. Meanwhile, the device has the advantages of simple structure, light weight and low manufacturing cost.

Drawings

Fig. 1 is a schematic structural view of a roll-inserting tooth positioning gap reducing device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an inlaid structure in a positioning sleeve according to an embodiment of the present invention.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

The embodiment provides a roll inserting tooth positioning gap reducing device, which has a structure shown in fig. 1 and mainly comprises a positioning shaft 1, a tooth blank 2, a positioning sleeve 3, an opening pressing plate 4, a fastening nut 5 and a dismounting nut 6.

The positioning shaft 1 comprises a supporting seat and a positioning part located on the supporting seat, and the positioning part comprises a three-section stepped shaft consisting of an upper section, a middle section and a lower section. The outer diameter of the upper section of the stepped shaft is smaller than that of the middle section, and threads are machined on the surface of the upper section; the outer diameter of the middle section of the stepped shaft is smaller than that of the lower section, the outer diameter of the lower section is larger than that of the positioning hole of the gear blank 2, the outer diameter difference between the lower section and the middle section forms an axial positioning surface of a step structure for axially positioning the gear blank 2, and threads are machined on the surface of the lower section.

The dismounting nut 6 is arranged at the lower section of the stepped shaft; the positioning sleeve 3 is arranged at the middle section of the stepped shaft, and the gear blank 2 is sleeved at the outer side of the positioning sleeve 3; the opening pressing plate 4 and the fastening nut 5 are sequentially arranged on the upper section of the stepped shaft. The lower surface of the fastening nut 5 is connected with the upper surface of the opening pressing plate 4, the lower surface of the opening pressing plate 4 is connected with the upper surface of the gear blank 2, and the lower surface of the gear blank 2 is connected with the axial positioning surface.

In the positioning clearance reducing device, the positioning sleeve 3 consists of a steel ring and a plurality of high-precision steel balls embedded on the steel ring. As shown in fig. 2, the steel ball can freely rotate and radially move in the embedding hole without falling off, so that the positioning sleeve 3 can be easily inserted into the middle section of the stepped shaft of the positioning shaft 1. The steel balls embedded in the positioning sleeve 3 are uniformly distributed along the axial direction and the circumferential direction, wherein the circumferential quantity is more than three groups, and the axial distribution is determined according to the axial length of the gear blank 2, but the quantity is not less than two groups, so that the clamping stability and the stress uniformity are improved. The gear blank 2 is positioned by the positioning sleeve 3 with steel balls, the surface contact of a hole and a shaft is changed into point contact, the sliding friction is changed into rolling friction, the assembling and disassembling friction force can be reduced, the assembling and disassembling are more convenient, and the efficiency is improved.

The steel balls are high-precision steel balls for bearings, the diameters of the steel balls are firstly grouped before being embedded into the steel ring, the group with the small diameter is embedded at the upper end of the steel ring and gradually increases downwards, the diameter difference between the upper steel ball and the lower steel ball is 0.01mm, and the group with the largest diameter is embedded at the lower end of the steel ring, so that the formed taper structure is favorable for improving the clamping convenience. For the same row of steel balls, the diameter difference is not more than 0.002 mm.

The dimensional tolerance of the positioning shaft 1 is controlled according to the dimensional tolerance of the positioning hole and the steel ball of the gear blank 2, and the tolerance of the positioning hole is about 0.02 mm. The positioning shaft consisting of the positioning shaft 1 and the positioning sleeve 3 is in interference fit with the positioning hole of the gear blank 2.

The use flow of the positioning clearance reducing device is as follows: the screw thread of the nut 6 along the lower section of the stepped shaft of the positioning shaft 1 is disassembled and screwed down to be lower than the axial positioning surface; inserting a positioning sleeve 3 into the middle section of the stepped shaft of the positioning shaft 1, and sleeving a gear blank 2 on the positioning sleeve 3; the opening pressing plate 4 is inserted into the upper section of the stepped shaft of the positioning shaft 1, and the fastening nut 5 is screwed. After the gear blank 2 is inserted and rolled to form the gear, the fastening nut 5 is unscrewed, and the opening pressing plate 4 is pulled out; and (3) upwards rotating the dismounting nut 6 to jack up the gear blank 2 and taking away the gear blank 2.

The working principle of the positioning clearance reducing device is as follows: on the premise of not increasing the manufacturing precision of the positioning shaft 1 and the gear blank 2, the manufacturing precision of the gear tooth part needs to be improved, the positioning clearance between the positioning shaft 1 and the gear blank 2 needs to be eliminated, and the gear blank 2 can be smoothly installed even under the condition of slight interference fit by utilizing the characteristic of small friction force of high-precision steel balls in the positioning sleeve 3, so that the clearance between the positioning shaft 1 and the gear blank 2 is eliminated, and the manufacturing precision and the clamping efficiency of the gear tooth part are improved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A roll inserting tooth positioning clearance reducing device is characterized by comprising a positioning shaft, a tooth blank, a positioning sleeve, an opening pressing plate, a fastening nut and a dismounting nut; wherein the content of the first and second substances,

the positioning shaft comprises a supporting seat and a positioning part positioned above the supporting seat, and the positioning part comprises a three-section stepped shaft consisting of an upper section, a middle section and a lower section; wherein, the outer diameter of the upper section of the stepped shaft is smaller than that of the middle section, and the surface of the upper section is provided with threads; the outer diameter of the middle section of the stepped shaft is smaller than that of the lower section, the outer diameter of the lower section is larger than that of the positioning hole of the gear blank, the outer diameter difference between the lower section and the middle section forms an axial positioning surface of a step structure for axially positioning the gear blank, and threads are machined on the surface of the lower section;

2. The positioning gap reducing device according to claim 1, wherein the positioning sleeve is composed of a steel ring and a plurality of steel balls embedded in the steel ring, and the steel balls are capable of freely rotating and radially moving in the embedded holes without falling off.

3. The positioning gap reducing device according to claim 2, wherein the steel balls embedded in the positioning sleeve are uniformly arranged in the axial direction and the circumferential direction, the number of the steel balls in the circumferential direction is greater than three groups, and the number of the steel balls in the axial direction is not less than two groups.

4. The positioning gap reducing device according to claim 2, wherein the steel balls having a small diameter are embedded in an upper end of the steel ring and gradually increase downward, and the steel balls having a largest diameter are embedded in a lower end of the steel ring, thereby forming a tapered structure.

5. The positioning gap reducing device according to claim 4, wherein the diameters of the upper and lower adjacent steel balls differ by 0.01 mm.

6. A positioning gap reducing device according to claim 4, wherein the difference in diameter of the steel balls in the same row is not more than 0.002 mm.