CN219852155U - Clamp sleeve - Google Patents

Abstract

The utility model discloses a clamp sleeve, which is characterized in that: comprises three arc clamping plates; the three arc clamping plates are sequentially and rotatably connected; a limiting baffle is arranged on the front end face of each arc-shaped clamping plate and is used for being in contact fit with the rear surface of the flange plate of the wheel shaft; when the three arc clamping plates rotate to be concentric with each other, a sleeve body with a gap is formed, and the following requirements are met at the moment: the inner diameter of the sleeve body is matched with the outer diameter of the middle neck section of the gear shaft, and the outer diameter of the sleeve body is larger than the outer diameter of the fluted disc of the gear shaft. The utility model can be used for positioning and clamping the gear shaft when the inner circle and the outer circle of the positioning ring are machined, can ensure that the gear shaft is positioned by an axial reference and clamped concentrically, can improve radial runout, roundness, coaxiality and dimensional accuracy, and is simple to operate without damaging the three-jaw chuck.

Description

Clamp sleeve

Technical Field

The utility model relates to a clamp sleeve.

Background

Reference is made to fig. 1-2, which are perspective views of a finished gear shaft. The gear shaft N is provided with a pipe shaft body N-1, a through hole N-11 is formed in the pipe shaft body N-1, a flange plate N-2 and a positioning ring N-3 are arranged at the front end of the pipe shaft body N-1, three connecting lugs N-4 are uniformly distributed on the edge of the flange plate N-3, connecting holes N-41 are drilled on the connecting lugs N-4, and a gear N-5 is machined on a fluted disc N-6 in the middle of the pipe shaft body N-1; the tube shaft body N-1 is provided with a middle neck section N-12 positioned between the flange plate N-2 and the gear N-5.

Referring to fig. 3, a process for machining the gear shaft N is to turn the positioning ring N-3 into an inner and outer circle, hereinafter referred to as "the process". Referring to fig. 4, the gear shaft N is directly clamped to the three-jaw chuck M of the lathe and the toothed disc N-6 on the gear shaft N is clamped by the three clamping jaws M-1 of the three-jaw chuck M; since the gear is processed after the process, the outer diameter of the fluted disc N-6 is larger than that of the middle neck section N-12, and the middle neck section N-12 has smaller wall thickness (for example, three clamping jaws M-1 are used for clamping the middle neck section N-12, so that the contact surface is extremely small, the stress is concentrated, deformation and clamping damage can be possibly caused, and particularly the clamping force is extremely large, and the like), so that the fluted disc N-6 can only be clamped. However, the following disadvantages are found in the actual production process:

firstly, because the axial distance between the fluted disc N-6 and the locating ring N-3 is very large, the free long arm of the locating ring N-3 has large stress vibration amplitude during the turning of the working procedure, and the problems of large radial runout error and low roundness and coaxiality precision exist;

secondly, as three clamping jaws M-1 of the three-jaw chuck M clamp the fluted disc N-6, three parts are clamped with extremely small contact surfaces (almost point contact), and the stress concentration exists to easily damage the surface of the excircle (remark: the finish machining of the excircle is finished before the working procedure of the fluted disc N-6, only the tooth is not machined), so that the appearance and the surface precision are affected;

thirdly, because the three clamping jaws M-1 of the three-jaw chuck M are difficult to axially reference and position when the fluted disc N-6 is clamped, if the three clamping jaws M-1 of the three-jaw chuck M are structurally changed, the cost is increased, the original structure is damaged, and the clamping performance and the effect of processing other different workpieces can be affected.

Disclosure of Invention

The utility model provides a clamp sleeve, which solves the problems that radial runout error is large, roundness and coaxiality precision are low, clamped excircles are easy to clamp and axial reference positioning is difficult due to the fact that a three-jaw chuck is adopted to directly clamp a fluted disc when a positioning ring on a gear shaft is machined (the working procedure is machined).

In order to achieve the above purpose, the scheme of the utility model is as follows: a clamp sleeve, characterized in that: comprises three arc clamping plates; the three arc clamping plates are sequentially and rotatably connected; a limiting baffle is arranged on the front end face of each arc-shaped clamping plate and is used for being in contact fit with the rear surface of the flange plate of the gear shaft; when the three arc clamping plates rotate to be concentric with each other, a sleeve body with a gap is formed, and the following requirements are met at the moment: the inner diameter of the sleeve body is matched with the outer diameter of the middle neck section of the gear shaft, and the outer diameter of the sleeve body is larger than the outer diameter of the fluted disc of the gear shaft.

By adopting the scheme, when clamping, the clamp sleeve is firstly sleeved on the middle neck section of the gear shaft in an unfolding state, then the three arc clamping plates are rotated to be in a sleeve shape to clamp the middle neck section of the gear shaft, and then the three arc clamping plates are integrally inserted into a three-jaw chuck of a lathe, so that the three clamping jaws of the three-jaw chuck clamp the three arc clamping plates respectively, the three clamping jaws are respectively in surface contact with the rear surface of the three limit baffles, and the three limit baffles are in surface contact with the rear surface of the flange plate of the gear shaft to finish positioning and clamping. The clamp sleeve has the following characteristics and is analyzed as follows:

firstly, when clamping, the three-jaw chuck clamps the middle neck section on the gear shaft after lining is sleeved by the clamp, and the axial distance between the middle neck section and the positioning ring is extremely small and very close, so that the free arm of the positioning ring is extremely short when turning in the working procedure, and the radial runout, roundness, coaxiality and dimensional accuracy of the positioning ring after turning inner and outer circles can be improved;

secondly, the inner diameter of the sleeve body is matched with the outer diameter of the middle neck section of the gear shaft during clamping, so that the inner wall of the sleeve body can ensure that the outer wall of the middle neck section of the gear shaft is almost completely surrounded and clamped in the circumferential direction (the width of the gap is very small and can be basically ignored), the contact area is increased, loosening can be reduced, meanwhile, the stress of the neck section can not be concentrated, extrusion deformation is avoided, the outer circle surface is not easily damaged, and the appearance and the surface precision can be ensured;

thirdly, as the three clamping claws are in surface contact with the three limit baffles and the three limit baffles are in surface contact with the rear surface of the flange plate of the gear shaft during clamping, the flange plate of each gear shaft can be ensured to be consistent with the standard on the main shaft after clamping, and only the tool setting is needed when the first workpiece is processed, and the tool setting is not needed when the second and more identical workpieces are clamped and continuously processed, so that the processing efficiency is greatly improved, the production cost is reduced, and meanwhile, the consistency of the size and the precision of batch products is ensured;

fourthly, the sleeve body is provided with a gap when in circular shape during clamping, so that the problem that the middle neck section of the gear shaft cannot be tightly sleeved due to small dimensional tolerance can be prevented;

fifth, because the clamp is sleeved on the three-jaw chuck and can be freely removed, the three-jaw chuck is not changed in structure, the three-jaw chuck still keeps original shape, the normal original function of the three-jaw chuck is not affected, and other different workpieces can be clamped and processed.

Preferably, the thickness of the arc-shaped clamping plate is 16-30mm.

Preferably, the width of the gap is 2-10mm.

Preferably, the axial length of the arc-shaped clamping plate is 100-200mm.

Preferably, the adjacent ends of the two adjacent arc-shaped clamping plates are rotatably connected through a rotating pin.

Preferably, the limit baffle is fan-shaped.

Preferably, the thickness of the limit baffle is 5-15mm.

The utility model has the beneficial effects that:

the clamp sleeve can be specially used for positioning and clamping the gear shaft when the gear shaft is turned into the positioning ring and the outer ring of the gear shaft, and has the advantages of simple structure, low cost, convenience in operation and low difficulty, labor cost can be reduced, and efficiency is improved;

secondly, the clamp is sleeved on the middle neck section of the clamping gear shaft after the three-jaw chuck is sleeved with the clamp for lining, and the axial distance between the middle neck section and the positioning ring is extremely small, so that the free arm of the positioning ring is extremely short during turning in the working procedure, and the radial runout, roundness, coaxiality and dimensional accuracy of the positioning ring after turning inner and outer circles are improved;

thirdly, when the clamp is sleeved and clamped, the inner diameter of the sleeve body is matched with the outer diameter of the middle neck section of the gear shaft, so that the inner wall of the sleeve body can ensure that the outer wall of the middle neck section of the gear shaft is almost completely surrounded and clamped in the circumferential direction (basically ignored due to the small width of the gap opening), the contact area is increased, loosening can be reduced, meanwhile, the stress of the neck section cannot be concentrated, extrusion deformation is avoided, the outer circle surface is not easily damaged, and the appearance and the surface precision can be ensured;

fourthly, the three clamping jaws are in surface contact with the three limit baffles during clamping, and the three limit baffles are in surface contact with the rear surface of the flange plate of the gear shaft, so that the consistency of the standard of the flange plate on the main shaft of each gear shaft after clamping can be ensured, and only the tool setting is required during the processing of the first workpiece, and the tool setting is not required during the clamping and continuous processing of the second and more identical workpieces, so that the processing efficiency can be greatly improved, the production cost is reduced, and the consistency of the size and the precision of batch products is also ensured;

fifth, the clamp is sleeved with a gap when clamping, so that the problem that the middle neck section of the gear shaft cannot be tightly sleeved due to small dimensional tolerance can be prevented;

sixth, the clamp sleeve of the utility model is freely removable because the clamp sleeve is sleeved on the three-jaw chuck, and the three-jaw chuck is not changed in structure, and the three-jaw chuck still keeps the original shape, does not influence the normal original function, and can clamp and process other different workpieces.

Drawings

Fig. 1-2 are perspective views of a gear shaft finished product.

Fig. 3 is a comparative view of a gear shaft before and after the processing of the present process.

Fig. 4 is a view showing an operation state in which a three-jaw chuck is used to directly clamp a gear shaft according to the prior art.

Fig. 5-6 are perspective views of a clamp sleeve in an expanded state in accordance with an embodiment of the present utility model.

Fig. 7-8 are perspective views of a clamp sleeve according to an embodiment of the present utility model when three arcuate clamping plates are rotated with respect to one another to a concentric (i.e., circular) configuration.

Fig. 9 is an exploded view of an embodiment of the present utility model when the jig sleeve is not assembled with the gear shaft.

Fig. 10 is a reference view (which corresponds to fig. 9 and is substantially the same) of a work site when the jig sleeve and the gear shaft are not assembled in the embodiment of the utility model.

Fig. 11 is a perspective view of a fixture sleeve clamped on a gear shaft in an embodiment of the present utility model.

Fig. 12 is a reference view (which corresponds to fig. 11 and is substantially the same) of a work site when a jig sleeve is clamped on a gear shaft according to an embodiment of the present utility model.

Fig. 13 is a perspective view of a clamp sleeve and gear shaft as a unit but not attached to a three-jaw chuck in accordance with an embodiment of the present utility model.

Fig. 14 is a perspective view of a clamp sleeve and gear shaft as a unit attached to a three-jaw chuck for clamping in place in accordance with an embodiment of the present utility model.

Fig. 15 is a reference view (which corresponds to fig. 14 and is substantially identical) of a work site when the clamp sleeve and gear shaft are clamped in place as a unit on the three-jaw chuck in an embodiment of the present utility model.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

examples: referring to fig. 5-6, a clamp sleeve comprises three arcuate clamping plates 1; the three arc clamping plates 1 are sequentially and rotatably connected.

Referring to fig. 5-6, a limit baffle 1-1 is arranged on the front end face of each arc clamping plate 1. Referring to fig. 11, the limit stop 1-1 is adapted to be in contact engagement with the rear surface of the flange N-2 of the gear shaft N-1 during clamping.

Referring to fig. 7-8, when the three arc clamping plates 1 are mutually rotated to be concentric, a sleeve body 2 with a gap 2-1 is formed, and the following requirements are satisfied: the inner diameter of the sleeve body 2 is matched with the outer diameter of the middle neck section N-12 of the gear shaft N-1 to concentrically clamp the middle neck section N-12 of the gear shaft N-1 (see FIG. 11); the outer diameter of the sleeve body 2 is larger than the outer diameter of the fluted disc N-6 of the gear shaft N-1 (the claw of the three-claw chuck can be prevented from being clamped to the fluted disc N-6 during clamping, and the damage and the interference can be avoided).

Preferably, the thickness of the arc clamping plate 1 is 16-30mm.

Preferably, the width of the gap opening 2-1 is 2-10mm.

Preferably, the axial length of the arc clamping plate 1 is 100-200mm. The middle neck section N-12 of the gear shaft N-1 is long in axial clamped length, so that the clamping effect can be improved and better.

Preferably, the adjacent ends of the two arc clamping plates 1 are rotatably connected through a rotating pin 3.

Preferably, the limit baffle 1-1 is fan-shaped.

Preferably, the thickness of the limit baffle 1-1 is 5-15mm.

In the clamping process, the clamp sleeve is firstly sleeved on the middle neck section N-12 of the gear shaft N-1 in an unfolding state, then the three arc clamping plates 1 are rotated to be in the shape of a sleeve body 2 to sleeve and clamp the middle neck section N-12 of the gear shaft N-1 (see fig. 11-13), then the clamp sleeve is integrally inserted into a three-jaw chuck M of a lathe, three jaws M-1 of the three-jaw chuck M clamp the three arc clamping plates 1 respectively, the three jaws M-1 are respectively in surface contact with three limit baffles 1-1, and the three limit baffles 1-1 are in surface contact with the rear surface of a flange plate N-2 of the gear shaft N-1 to finish positioning and clamping (see fig. 14-15).

The clamp sleeve has the following characteristics and is analyzed as follows:

firstly, when in clamping, the three-jaw chuck M is sleeved by the clamp to clamp the middle neck section N-12 on the gear shaft N after lining, and the axial distance between the middle neck section N-12 and the positioning ring N-3 is extremely small, so that the free arm of the positioning ring N-3 is extremely short when in turning in the working procedure, and the radial runout, roundness, coaxiality and dimensional accuracy of the positioning ring N-3 after the inner and outer circles of a vehicle are machined can be improved;

secondly, during clamping, the inner diameter of the sleeve body 2 is matched with the outer diameter of the middle neck section N-12 of the gear shaft N-1, so that the inner wall of the sleeve body 2 almost completely surrounds the outer wall of the middle neck section N-12 of the gear shaft N-1 in the circumferential direction, the clamping can be basically ignored and kept concentric due to the small width of the gap, the contact area is increased, loosening can be reduced, meanwhile, the stress of the neck section N-12 cannot be concentrated, extrusion deformation is avoided, the outer circle surface is not easily damaged, and the appearance and the surface precision can be ensured;

thirdly, during clamping, the three clamping claws are in surface contact with the three limit baffles 1-1, and the three limit baffles 1-1 are in surface contact with the rear surface of the flange N-2 of the gear shaft N-1, so that the consistency of the standard of the flange N-2 of each gear shaft N-1 on a main shaft after clamping can be ensured, only the tool setting is required when a first workpiece is machined, and the tool setting is not required when a second workpiece and more identical workpieces are clamped and continuously machined, so that the machining efficiency can be greatly improved, the production cost is reduced, and the consistency of the size and the precision of batch products is also ensured;

fourth, because the sleeve body 2 is provided with the gap opening 2-1 during clamping, the problem that the middle neck section N-12 of the gear shaft N-1 can not be tightly sleeved due to small dimensional tolerance can be prevented;

fifth, because the clamp is sleeved on the three-jaw chuck and can be freely removed, the three-jaw chuck is not changed in structure, the three-jaw chuck still keeps original shape, the normal original function of the three-jaw chuck is not affected, and other different workpieces can be clamped and processed.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (7)

1. A clamp sleeve, characterized in that: comprises three arc clamping plates (1); the three arc clamping plates (1) are sequentially and rotatably connected; a limit baffle (1-1) is arranged on the front end face of each arc clamping plate (1), and the limit baffle (1-1) is used for being in contact fit with the rear surface of a flange plate (N-2) of the gear shaft (N-1);

when the three arc clamping plates (1) rotate to be concentric with each other, a sleeve body (2) with a gap opening (2-1) is formed, and the following requirements are met at the moment: the inner diameter of the sleeve body (2) is matched with the outer diameter of the middle neck section (N-12) of the gear shaft (N-1), and the outer diameter of the sleeve body (2) is larger than the outer diameter of the fluted disc (N-6) of the gear shaft (N-1).

2. A clamp sleeve as defined in claim 1, wherein: the thickness of the arc-shaped clamping plate (1) is 16-30mm.

3. A clamp sleeve as defined in claim 1, wherein: the width of the gap opening (2-1) is 2-10mm.

4. A clamp sleeve as defined in claim 1, wherein: the axial length of the arc clamping plate (1) is 100-200mm.

5. A clamp sleeve as defined in claim 1, wherein: the adjacent ends of the two adjacent arc clamping plates (1) are rotatably connected through a rotating pin (3).

6. A clamp sleeve as defined in claim 1, wherein: the limit baffle (1-1) is fan-shaped.

7. A clamp sleeve according to any one of claims 1 to 6, wherein: the thickness of the limit baffle (1-1) is 5-15mm.