CN215545531U

CN215545531U - Miniature precision gear machining tool

Info

Publication number: CN215545531U
Application number: CN202120593632.9U
Authority: CN
Inventors: 王亚东
Original assignee: Nanjing Tuozhong Transmission Technology Co ltd
Current assignee: Nanjing Tuozhong Transmission Technology Co ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2022-01-18
Anticipated expiration: 2031-03-23

Abstract

The utility model discloses a miniature precision gear machining tool, which is applied to the technical field of gear machining, and the technical scheme is as follows: the device comprises a connecting shaft assembly for connecting the blank with a main shaft and a clamping assembly for limiting the position of the blank; the connecting shaft assembly comprises a mounting shaft and a hobbing core rod, the mounting shaft and the hobbing core rod are coaxially arranged, the diameter of the mounting shaft is larger than that of the hobbing core rod, and the blank is sleeved on the hobbing core rod; the clamping assembly comprises a supporting shaft and a clamping sleeve, the supporting shaft and the clamping sleeve are coaxially arranged, one end, far away from the supporting shaft, of the clamping sleeve is provided with a positioning hole coaxially arranged with the supporting shaft, and the hobbing core rod is inserted into the positioning hole; the micro gear machining fixture has the technical effect that the micro gear blank can be conveniently and quickly clamped on the main shaft, so that the micro gear blank can be stably machined.

Description

Miniature precision gear machining tool

Technical Field

The utility model relates to the technical field of gear machining, in particular to a miniature precision gear machining tool.

Background

At present, chinese patent with publication number CN103223531B discloses a numerical control gear hobbing machine and a method for processing gears thereof, which includes a machine body, a large upright and a workbench fixed on the machine body, a hob box installed on the large upright, a workpiece spindle installed in a housing of the workbench, the hob box and the workbench both controlled by a programmable PLC control board or a programmable computer, wherein: the top of the large upright post is provided with a servo motor I which controls the hob box to move up and down along the guide rail of the large upright post, and the rotating speed of a cutter arranged on the hob box is n 2; the workpiece spindle is connected with an output shaft of a servo motor II through a harmonic speed reducer, and a programmable PLC control panel or a programmable computer controls the opening and closing of the servo motor II and controls the rotating speed of the workpiece spindle to be n 1; wherein 5n1 is not less than n2, and the constant ratio obtained by n2/n1 is the number Z of teeth of the processing gear.

The traditional numerical control gear hobbing machine needs to clamp a gear blank to be machined on a workpiece spindle when machining a gear, but when machining a miniature precise gear, the blank of the miniature gear is difficult to clamp on the workpiece spindle because the diameter of the miniature gear is too small.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a micro precision gear machining tool which has the advantages that a blank of a micro gear can be conveniently and quickly clamped on a main shaft, so that the blank can be stably machined.

The technical purpose of the utility model is realized by the following technical scheme: a micro precision gear machining tool,

the device comprises a connecting shaft assembly for connecting the blank with a main shaft and a clamping assembly for limiting the position of the blank;

the connecting shaft assembly comprises a mounting shaft and a hobbing core rod, the mounting shaft and the hobbing core rod are coaxially arranged, the diameter of the mounting shaft is larger than that of the hobbing core rod, and a blank is sleeved on the hobbing core rod;

the clamping assembly comprises a supporting shaft and a clamping sleeve, the supporting shaft and the clamping sleeve are coaxially arranged, one end, far away from the supporting shaft, of the clamping sleeve is provided with a positioning hole which is coaxially arranged with the supporting shaft, and the hobbing core rod is inserted into the positioning hole.

Through the technical scheme, the mounting shaft can be clamped by the three-jaw chuck so as to be relatively and fixedly connected with the main shaft of the machine tool, the blank can be sleeved on the hobbing core rod, and the hobbing core rod better limits the freedom degree of the blank so as to be relatively stable when the blank is processed; the locating hole is used for supplying the gear hobbing plug to insert to gear hobbing plug and clamping sleeve butt joint, clamping sleeve are used for supporting the blank tightly on the installation axle, and then the better restriction blank is at the epaxial position of gear hobbing plug, stability when further having improved processing blank.

The utility model is further configured to: and a transition section is arranged between the mounting shaft and the hobbing core rod, and the diameter of the transition section is gradually reduced from the mounting shaft to the hobbing core rod.

Through above-mentioned technical scheme, the changeover portion is used for linking up installation axle and gear hobbing plug, because on the less clamping three-jaw chuck to the lathe of being not convenient for of diameter of gear hobbing plug, the diameter of changeover portion reduces gradually, can be better avoid the sudden diameter difference too big and cause the concentration of stress for the holistic structural strength of centre gripping subassembly is better, thereby more stable support blank.

The utility model is further configured to: the transition section extends towards one end of the hobbing core rod to form a limiting column, and one end of the limiting column, which faces towards the hobbing core rod, is a limiting surface.

Through the technical scheme, the limiting surface is used for being attached to the end face of the blank, and the limiting surface can be processed by finish machining, so that the position of the blank in the axial direction of the hobbing core rod can be more accurately limited.

The utility model is further configured to: the supporting shaft is rotatably matched with a mounting shaft sleeve, and a limiting shaft shoulder is arranged between the supporting shaft and the clamping sleeve;

the terminal surface of installation axle sleeve towards spacing shaft shoulder is fixed with the foundation ring, spacing shaft shoulder is fixed with the shaft collar towards the one end of installation axle sleeve, be provided with a plurality of balls between foundation ring and the shaft collar, the annular slot that is used for placing the ball is all offered to the terminal surface that foundation ring and shaft collar are relative.

Through the technical scheme, the mounting shaft sleeve is used for being matched with a tailstock on a machine tool, and the position of the supporting shaft can be well limited by the mounting shaft sleeve; the balls are used for reducing the friction force between the bottom ring and the shaft ring, and the annular groove is used for accommodating the balls, so that the relative positions of the balls and the shaft ring and the bottom ring are more accurate; therefore, when the mounting shaft sleeve is tightly abutted to the supporting shaft, the supporting shaft can stably rotate along with the main shaft of the machine tool.

The utility model is further configured to: the bottom ring and the shaft ring are provided with retainers, through holes for placing balls are formed in the retainers, and the balls are rotatably arranged in the through holes.

Through above-mentioned technical scheme, the through-hole on the holder is used for placing the ball, and the holder is used for restricting the relative position between the ball for the distribution that the ball can be even is between bottom ring and race, so that support shaft and installation axle sleeve relatively pivoted more steady.

The utility model is further configured to: the outer side of the mounting shaft sleeve is detachably provided with a sealing shaft sleeve, and the sealing shaft sleeve is sleeved on the outer side of the limiting shaft shoulder;

the limiting shaft sleeve is characterized in that a sealing ring groove is formed in the circumferential surface of the limiting shaft shoulder, a sealing rubber ring is arranged in the sealing ring groove, and the sealing rubber ring is abutted to the inner wall of the sealing shaft sleeve.

Through above-mentioned technical scheme, the seal ring groove is used for holding the sealing rubber circle for the sealing rubber circle is placed more stably, and the sealing rubber circle is plugged up with the inner wall butt of seal shaft sleeve, can be better with the clearance packing between seal shaft sleeve and the spacing axis, thereby better avoid piece in the course of working to splash between end circle and the race, has avoided the relative rotation of back shaft and installation axle sleeve to receive the influence.

The utility model is further configured to: the two sides of the sealing shaft sleeve are provided with locking bolts symmetrically arranged, and the locking bolts are in threaded fit with the sealing shaft sleeve and are abutted against the outer side wall of the mounting shaft sleeve.

Through the technical scheme, the locking bolt is used for locking the sealing shaft sleeve outside the mounting shaft sleeve, so that the sealing shaft sleeve can be conveniently disassembled and assembled; and lubricating grease can be conveniently injected between the bottom ring and the shaft ring, so that the mounting shaft sleeve and the supporting shaft can rotate relatively more stably.

The utility model is further configured to: the section of the sealing rubber ring is O-shaped.

Through above-mentioned technical scheme, the cross-section is in the sealing ring groove can be more stable placing for the sealing rubber circle of O shape, makes the sealing rubber circle be close to line contact with the inner wall of sealed axle sleeve simultaneously, when having guaranteed sealed effect, has reduced the frictional force between sealing rubber circle and the sealed axle sleeve as far as.

In conclusion, the utility model has the following beneficial effects:

1. the connecting shaft assembly is used for relatively and fixedly connecting the blank and the main shaft, so that the main shaft can stably drive the blank to rotate, and the clamping assembly further clamps the blank on the connecting shaft assembly, so that the blank is more stable when being processed;

2. the clearance shutoff that the sealing rubber circle can be better between spacing shaft shoulder and the sealed axle sleeve avoids piece and dirty entering into between foundation ring and the shaft collar for the back shaft can more stable rotation, thereby more stable drive blank rotates.

Drawings

Fig. 1 is an overall configuration diagram of the present embodiment;

FIG. 2 is a schematic structural view of the coupling assembly of the present embodiment;

FIG. 3 is a schematic structural view of the clamping assembly of the present embodiment;

FIG. 4 is an exploded view of the overall structure of the present embodiment;

fig. 5 is a schematic view of the fitting relationship of the base ring, the race and the balls of the present embodiment.

Reference numerals: 1. a coupling shaft assembly; 2. a clamping assembly; 3. installing a shaft; 4. hobbing a core rod; 5. a support shaft; 6. a clamping sleeve; 7. positioning holes; 8. a transition section; 9. a limiting column; 10. a limiting surface; 11. installing a shaft sleeve; 12. a limiting shaft shoulder; 13. a bottom ring; 14. a shaft ring; 15. a ball bearing; 16. an annular groove; 17. a holder; 18. a through hole; 19. sealing the shaft sleeve; 20. sealing the ring groove; 21. sealing the rubber ring; 22. and locking the bolt.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

referring to fig. 1 and 2, a micro precision gear machining tool comprises a connecting shaft assembly 1 and a clamping assembly 2, wherein the connecting shaft assembly 1 comprises an installation shaft 3 and a hobbing core rod 4, the installation shaft 3 is used for clamping a three-jaw chuck of a machine tool, a blank is sleeved on the hobbing core rod 4, and an inner hole of the blank is in transition fit with the hobbing core rod 4; the outer circumferential surface of the hobbing core rod 4 is polished by a grinding machine so as to ensure the dimensional accuracy and the surface accuracy of the hobbing core rod 4.

Referring to fig. 1 and 2, a transition section 8 is arranged between the mounting shaft 3 and the hobbing core rod 4, the outer side surface of the transition section 8 is arranged in a circular arc surface, and the diameter of the transition section 8 gradually decreases from the mounting shaft 3 to the hobbing core rod 4; a limiting column 9 is arranged at one end of the transition section 8 facing the hobbing core rod 4, the diameter of the limiting column 9 is larger than that of the hobbing core rod 4, and the end face of the limiting column 9 facing the hobbing core rod 4 is a limiting face 10; the mounting shaft 3, the transition section 8, the limiting column 9 and the hobbing core rod 4 are integrally formed and can be machined by a lathe. After the blank is sleeved on the hobbing core rod 4, one end of the blank is abutted to the limiting surface 10, and meanwhile, the clamping assembly 2 can tightly abut the blank on the limiting surface 10.

Referring to fig. 2 and 3, the clamping assembly 2 includes a supporting shaft 5 and a clamping sleeve 6 coaxially disposed with the supporting shaft 5, one end of the clamping sleeve 6 away from the supporting shaft 5 is provided with a positioning hole 7, and the positioning hole 7 is coaxially disposed with the clamping sleeve 6; the hobbing core rod 4 can be inserted into the positioning hole 7, and the hobbing core rod 4 is in clearance fit with the positioning hole 7.

Referring to fig. 4 and 5, a limiting shaft shoulder 12 is arranged between the supporting shaft 5 and the clamping sleeve 6, and a mounting shaft sleeve 11 is rotatably matched on the supporting shaft 5; a placing groove is formed in one end, facing the limiting shaft shoulder 12, of the mounting shaft sleeve 11, a bottom ring 13 is in clamping fit in the placing groove, a shaft ring 14 is fixed to one end, facing the mounting shaft sleeve 11, of the limiting shaft piece, the shaft ring 14 is sleeved on the supporting shaft 5, and the shaft ring 14 is in interference fit with the supporting shaft 5; a plurality of balls 15 are arranged between the bottom ring 13 and the shaft ring 14, the balls 15 are uniformly distributed along the circumferential direction of the bottom ring 13, a retainer 17 is arranged between the bottom ring 13 and the shaft ring 14, a through hole 18 is formed in the retainer 17, and the balls 15 are arranged in the through hole 18 in a rolling manner; the opposite end faces of the bottom ring 13 and the shaft ring 14 are provided with annular grooves 16, and the annular grooves 16 are used for containing the balls 15.

Referring to fig. 4, a sealing shaft sleeve 19 is sleeved outside the mounting shaft sleeve 11, the sealing shaft sleeve 19 is simultaneously sleeved on the outer circumferential surface of the limiting shaft shoulder 12, locking bolts 22 are in threaded fit on both sides of the sealing shaft sleeve 19, the two locking bolts 22 are symmetrically arranged, and one end of each locking bolt 22, which is far away from the nut, is abutted to the outer circumferential surface of the mounting shaft sleeve 11.

The mounting shaft sleeve 11 is fixedly connected with a tailstock of a machine tool, and then the tailstock slides towards the direction of the three-jaw chuck, so that the blank is tightly propped against the limiting surface 10 by the clamping sleeve 6; the cooperation of the collar 14, the bottom ring 13 and the balls 15 makes the clamping sleeve 6 not affect the rotation of the support shaft 5 while abutting against the support shaft 5.

Referring to fig. 4, a sealing ring groove 20 is formed on the circumferential surface of the limiting shaft shoulder 12, a sealing rubber ring 21 is sleeved on the limiting shaft shoulder 12, and the cross section of the sealing rubber ring 21 is O-shaped; the sealing rubber ring 21 is arranged in the sealing ring groove 20, and the rubber ring is abutted with the inner wall of the sealing shaft sleeve 19; the rubber ring can be better with the clearance shutoff between 19 and the spacing shaft shoulder 12 of sealed axle sleeve to can be better avoid splashing between axle ring 14 and the end collar 13 at the in-process piece of gear hobbing processing, avoided installation axle sleeve 11 and back shaft 5 normal running fit to take place the card condition of pausing.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. A micro precision gear machining tool,

the device is characterized by comprising a connecting shaft component (1) for connecting the blank and a main shaft and a clamping component (2) for limiting the position of the blank;

the connecting shaft assembly (1) comprises a mounting shaft (3) and a hobbing core rod (4), the mounting shaft (3) and the hobbing core rod (4) are coaxially arranged, the diameter of the mounting shaft (3) is larger than that of the hobbing core rod (4), and a blank is sleeved on the hobbing core rod (4);

the clamping assembly (2) comprises a supporting shaft (5) and a clamping sleeve (6), the supporting shaft (5) and the clamping sleeve (6) are coaxially arranged, one end, far away from the supporting shaft (5), of the clamping sleeve (6) is provided with a positioning hole (7) which is coaxially arranged with the clamping sleeve, and the hobbing core rod (4) is inserted into the positioning hole (7).

2. The micro precision gear machining tool according to claim 1, wherein a transition section (8) is arranged between the mounting shaft (3) and the hobbing core rod (4), and the diameter of the transition section (8) is gradually reduced from the mounting shaft (3) to the hobbing core rod (4).

3. The micro precision gear machining tool according to claim 2, wherein a limiting column (9) extends from one end of the transition section (8) facing the hobbing core rod (4), and a limiting surface (10) is formed at one end of the limiting column (9) facing the hobbing core rod (4).

4. The micro precision gear machining tool according to claim 3, characterized in that a mounting shaft sleeve (11) is rotatably fitted on the support shaft (5), and a limiting shaft shoulder (12) is arranged between the support shaft (5) and the clamping sleeve (6);

installing shaft sleeve (11) and being fixed with foundation ring (13) towards the one end of spacing shaft shoulder (12), spacing shaft shoulder (12) are fixed with shaft collar (14) towards the one end of installing shaft sleeve (11), be provided with a plurality of balls (15) between foundation ring (13) and shaft collar (14), annular slot (16) that are used for placing ball (15) are all offered to the terminal surface that foundation ring (13) and shaft collar (14) are relative.

5. The micro precision gear machining tool according to claim 4, wherein the bottom ring (13) and the shaft ring (14) are provided with a retainer (17), a through hole (18) for placing the ball (15) is formed in the retainer (17), and the ball (15) is rotatably arranged in the through hole (18).

6. The miniature precision gear machining tool according to claim 4, wherein a sealing shaft sleeve (19) is detachably arranged on the outer side of the mounting shaft sleeve (11), and the sealing shaft sleeve (19) is sleeved on the outer side of the limiting shaft shoulder (12) at the same time;

the sealing ring groove (20) is formed in the circumferential surface of the limiting shaft shoulder (12), a sealing rubber ring (21) is arranged in the sealing ring groove (20), and the sealing rubber ring (21) is abutted to the inner wall of the sealing shaft sleeve (19).

7. The miniature precision gear machining tool according to claim 6, wherein locking bolts (22) are arranged on two sides of the sealing shaft sleeve (19), the two locking bolts (22) are symmetrically arranged, and the locking bolts (22) are in threaded fit with the sealing shaft sleeve (19) and abut against the outer side wall of the mounting shaft sleeve (11).

8. The micro precision gear machining tool according to claim 6, wherein the cross section of the sealing rubber ring (21) is O-shaped.