Tailstock chuck device

Abstract

The utility model relates to a tailstock chuck device which sequentially comprises a taper shank, an axial limiting assembly and a sleeve from inside to outside. The axial limiting assembly comprises a front gland and a rear gland which are arranged in a spaced mode, the front gland and the rear gland correspond to the two ends of the sleeve respectively and are matched with the sleeve to form a containing space, a bearing set is arranged in the containing space, and the taper shank is rotationally connected with the sleeve through the bearing set. Through the arrangement of the axial limiting assembly, the inner ring of the tapered roller bearing, the inner ring of the cylindrical roller bearing, the bearing pressing sleeve and the taper shank form a synchronous inner rotating part; the outer ring of the tapered roller bearing, the outer ring of the cylindrical roller bearing, the thrust ball bearing and the sleeve form a synchronous outer rotating part; the axial length of the relative rotating part is extended through the relative rotation of the rotating part of the taper shank and the sleeve, namely the inner rotating part and the outer rotating part, so that the rotation is more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of chucks, in particular to a tailstock chuck device. Background Art

[0002] The tailstock chuck is a key component used to secure workpieces on machine tools. It precisely positions the workpiece by clamping or loosening it, ensuring a stable, constant position during machining, thereby improving machining accuracy and efficiency. The tailstock chuck is typically mounted at the rear of the machine tool, corresponding to the spindle chuck, to simultaneously clamp both ends of the workpiece. It is suitable for machining long shaft parts. In existing technology, the chuck is connected to the spindle via a tapered shank, held together only by a nut. This connection can easily loosen after a period of use. Utility Model Content

[0003] The present invention aims to solve the problems in the prior art and provides a tailstock chuck device. The specific technical solutions are as follows:

[0004] A tailstock chuck device comprises, from the inside out, a tapered shank, an axial limiting assembly, and a sleeve;

[0005] The axial limiting assembly includes a front pressure cover and a rear pressure cover arranged at intervals. The front pressure cover and the rear pressure cover respectively correspond to the two ends of the sleeve and cooperate with the sleeve to form an accommodating space. A bearing group is provided in the accommodating space, and the tapered handle is rotatably connected to the sleeve through the bearing group.

[0006] As a further technical solution of the present invention, the bearing group includes a tapered roller bearing, a cylindrical roller bearing, a bearing sleeve and a thrust ball bearing that are pressed in sequence along the axial direction. The sleeve extends inward with a tail protrusion, and an inner washer and a hole elastic retaining ring are arranged at intervals in the sleeve. The inner washer cooperates with the tail protrusion to limit the outer ring of the tapered roller bearing, and the inner washer cooperates with the hole elastic retaining ring to limit the outer ring of the cylindrical roller bearing.

[0007] As a further technical solution of the present invention, the rear pressure cover is detachably connected to the sleeve by a hexagon socket cylindrical head bolt, and the rear pressure cover has a convex head on the end face facing the accommodating space. In the installed state, the convex head presses the thrust ball bearing and cooperates with the bearing sleeve to form a relative rotating part.

[0008] As a further technical solution of the present invention, a round nut is screwed onto the insertion end of the tapered shank, the front pressure cover is sleeved on the tapered shank, and the round nut drives the front pressure cover to cooperate with the rear pressure cover to limit the bearing group. In the installed state, the front pressure cover cooperates with the tail protrusion of the sleeve to seal one end opening of the sleeve, and there is a gap between the front pressure cover and the tail protrusion of the sleeve.

[0009] As a further technical solution of the utility model, it also includes a hexagonal head bolt and a four-jaw chuck. The butt end of the sleeve is provided with a flange. The hexagonal head bolt passes through the flange and is screwed to the four-jaw chuck. A flat washer and an elastic washer are sequentially ringed on the screw portion of the hexagonal head bolt. In the installed state, the flat washer and the elastic washer are squeezed between the screw head of the hexagonal head bolt and the flange.

[0010] The beneficial effects of the utility model are as follows:

[0011] In the present application, by setting up the axial limiting assembly, the inner ring of the tapered roller bearing, the inner ring of the cylindrical roller bearing, the bearing sleeve and the tapered shank form a synchronous inner rotating part; the outer ring of the tapered roller bearing, the outer ring of the cylindrical roller bearing, the thrust ball bearing and the sleeve form a synchronous outer rotating part; the rotating parts of the tapered shank and the sleeve, that is, the relative rotation of the inner rotating part and the outer rotating part, extend the axial length of the relative rotating part, making the rotation smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the three-dimensional structure of a tailstock chuck device is shown;

[0013] Figure 2 shows a plan view of a tailstock chuck assembly;

[0014] Figure 3 Shown Figure 2 Sectional view at AA in the figure.

[0015] Legend:

[0016] 1. Tapered shank; 2. Sleeve; 3. Front gland; 4. Rear gland; 5. Inner washer; 6. Bearing sleeve; 7. Double-sided toothed anti-loosening washer; 8. Hexagonal head bolt; 9. Hexagon socket head bolt; 10. Cylindrical roller bearing; 11. Round nut; 12. Tapered roller bearing; 13. Elastic circlip for hole; 14. Flat washer; 15. Elastic washer; 16. Thrust ball bearing; 17. Four-jaw chuck. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a tailstock chuck device is shown; Figure 2 A plan view of a tailstock chuck assembly is shown; Figure 3 Shown Figure 2 The sectional view at AA in the figure; Figure 1-Figure 3In the embodiment of the present invention, a tailstock chuck device includes, from the inside to the outside, a tapered shank 1, an axial limiting assembly and a sleeve 2. The axial limiting assembly includes a front pressure cover 3 and a rear pressure cover 4 arranged at intervals. The front pressure cover 3 and the rear pressure cover 4 respectively correspond to the two ends of the sleeve 2 and cooperate with the sleeve 2 to form an accommodating space. A bearing group is provided in the accommodating space. The tapered shank 1 is rotatably connected to the sleeve 2 through the bearing group. The bearing group is used to enable relative rotation between the tapered shank 1 and the sleeve 2, which is beneficial to the processing of the chuck and the shaft. The tapered shank 1 is pressed by the front pressure cover 3 and the rear pressure cover 4 on both sides, which can limit the axial displacement of the tapered shank 1 and avoid the axial movement of the tapered shank 1. The sleeve 2 is used to cooperate with the bearing group to indirectly limit the tapered shank 1 from the radial direction, which can limit the radial fluctuation of the tapered shank 1 and improve the fixing effect of the tapered shank 1 after installation.

[0019] Continue to see Figure 3 The bearing group includes a tapered roller bearing 12, a cylindrical roller bearing 10, a bearing sleeve 6 and a thrust ball bearing 16 that are pressed in sequence along the axial direction. The sleeve 2 extends inward with a tail bulge, and an inner washer 5 and a hole elastic retaining ring 13 are arranged at intervals in the sleeve 2. The inner washer 5 cooperates with the tail bulge to limit the outer ring of the tapered roller bearing 12, and the inner washer 5 cooperates with the hole elastic retaining ring 13 to limit the outer ring of the cylindrical roller bearing 10; the tapered roller bearing 12, the cylindrical roller bearing 10, the bearing sleeve 6 and the thrust ball bearing 16 are combined to form a bearing set. Since the four are in close contact with each other, axial stability can still be guaranteed, and since the tapered roller bearing 12 and the cylindrical roller bearing 10 are both split bearings, they are both composed of an outer ring and an inner ring. This design can better withstand radial and axial loads, and the outer rings of the tapered roller bearing 12 and the cylindrical roller bearing 10 are both confined in the sleeve 2, and the inner rings of the tapered roller bearing 12 and the cylindrical roller bearing 10 are both connected to the tapered shank 1. In this way, that is, during relative rotation, the inner ring of the tapered roller bearing 12, the inner ring of the cylindrical roller bearing 10, the bearing sleeve 6 and the tapered shank 1 form a synchronous inner rotating part, and the outer ring of the tapered roller bearing 12, the outer ring of the cylindrical roller bearing 10, the thrust ball bearing 16 and the sleeve 2 form a synchronous outer rotating part. The relative rotation of the rotating parts of the tapered shank 1 and the sleeve 2, that is, the inner rotating part and the outer rotating part, extends the axial length of the relatively rotating part, making the rotation more stable.

[0020] Continue to see Figure 3The rear pressure cover 4 is detachably connected to the sleeve 2 by a hexagon socket cylindrical head bolt 9, and the rear pressure cover 4 has a convex head on the end face facing the accommodating space. In the installed state, the convex head presses the thrust ball bearing 16 and cooperates with the bearing sleeve 6 to form a relatively rotating part; that is, the thrust ball bearing 16 and the bearing sleeve 6 are a group of split ball bearing structures. In this way, the bearing sleeve 6, the thrust ball bearing 16 or any one of the balls between the bearing sleeve 6 and the thrust ball bearing 16 can be replaced separately during disassembly, which is beneficial to the maintenance of parts, and the rear pressure cover 4 is detachably connected to the sleeve 2 by a hexagon socket cylindrical head bolt 9, and will move with the outer rotating part after installation; a double-sided tooth anti-loosening gasket 7 is provided between the head of the hexagon socket cylindrical head bolt 9 and the rear pressure cover 4; the double-sided tooth anti-loosening gasket 7 is used to increase the tightness of the rear pressure cover 4 and the hexagon socket cylindrical head bolt 9 after connection.

[0021] Continue to participate Figure 3 The insertion end of the tapered handle 1 is screwed with a round nut 11, and the front pressure cover 3 is sleeved on the tapered handle 1. The round nut 11 drives the front pressure cover 3 to cooperate with the rear pressure cover 4 to limit the bearing group. In the installed state, the front pressure cover 3 cooperates with the tail protrusion of the sleeve 2 to block one end opening of the sleeve 2, and there is a gap between the front pressure cover 3 and the tail protrusion of the sleeve 2; the front pressure cover 3 is movably connected to the tapered handle 1, so that the tapered handle 1 and the front pressure cover 3 can be disassembled from each other. After installation, you only need to rotate the round nut 11 to limit the position of the front pressure cover 3, and you can still lock the position of the front pressure cover 3 to ensure the tightness between the various components in the bearing group.

[0022] Continue to see Figure 3 , also includes a hexagonal head bolt 8 and a four-jaw chuck 17, the butt end of the sleeve 2 is provided with a flange, the hexagonal head bolt 8 passes through the flange and is screwed to the four-jaw chuck 17, and the screw portion of the hexagonal head bolt 8 is sequentially annularly sleeved with a flat washer 14 and an elastic washer 15. In the installed state, the flat washer 14 and the elastic washer 15 are squeezed between the screw head of the hexagonal head bolt 8 and the flange; the four-jaw chuck 17 and the sleeve 2 are detachably connected by the hexagonal head bolt 8, so that the sleeve 2 can be removed for replacement, and the arrangement of the flat washer 14 and the elastic washer 15 can further ensure the firmness of the connection between the sleeve 2 and the four-jaw chuck 17.

[0023] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A tailstock chuck device, characterized in that: From the inside to the outside, it includes a tapered handle (1), an axial limiting component and a sleeve (2); The axial limiting assembly comprises a front pressure cover (3) and a rear pressure cover (4) arranged at intervals, wherein the front pressure cover (3) and the rear pressure cover (4) respectively correspond to the two ends of the sleeve (2) and cooperate with the sleeve (2) to form an accommodating space, wherein a bearing group is provided in the accommodating space, and the tapered shank (1) is rotatably connected to the sleeve (2) via the bearing group.

2. A tailstock chuck device according to claim 1, characterized in that: The bearing group comprises a tapered roller bearing (12), a cylindrical roller bearing (10), a bearing sleeve (6) and a thrust ball bearing (16) which are pressed in sequence along the axial direction. The sleeve (2) extends inwardly to form a tail protrusion. An inner washer (5) and a hole elastic retaining ring (13) are arranged in the sleeve (2) at intervals. The inner washer (5) cooperates with the tail protrusion to limit the outer ring of the tapered roller bearing (12), and the inner washer (5) cooperates with the hole elastic retaining ring (13) to limit the outer ring of the cylindrical roller bearing (10).

3. A tailstock chuck device according to claim 2, characterized in that: The rear pressure cover (4) is detachably connected to the sleeve (2) via a hexagon socket head bolt (9). The rear pressure cover (4) has a convex head on the end face facing the accommodating space. In the installed state, the convex head presses the thrust ball bearing (16) and cooperates with the bearing sleeve (6) to form a relatively rotating part.

4. A tailstock chuck device according to claim 3, characterized in that: The insertion end of the tapered shank (1) is screwed with a round nut (11), and the front pressure cover (3) is annularly sleeved on the tapered shank (1). The round nut (11) drives the front pressure cover (3) to cooperate with the rear pressure cover (4) to limit the bearing group. In the installed state, the front pressure cover (3) cooperates with the tail protrusion of the sleeve (2) to seal one end opening of the sleeve (2), and there is a gap between the front pressure cover (3) and the tail protrusion of the sleeve (2).

5. The tailstock chuck device according to claim 3, characterized in that: It also includes a hexagonal bolt (8) and a four-jaw chuck (17). The butt end of the sleeve (2) is provided with a flange. The hexagonal bolt (8) passes through the flange and is screwed to the four-jaw chuck (17). A flat washer (14) and an elastic washer (15) are sequentially sleeved on the screw portion of the hexagonal bolt (8). In the installed state, the flat washer (14) and the elastic washer (15) are squeezed between the screw head of the hexagonal bolt (8) and the flange.

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