Hollow gear shaft tool clamp for gear hobbing machine

Abstract

The utility model relates to a hollow gear shaft work fixture for a gear hobbing machine, and belongs to the technical field of work fixtures. According to the technical scheme, a first positioning hole is formed in the end face of the top of a pressing cover, a first tip of a gear hobbing machine abuts against the interior of the first positioning hole, a positioning shaft is arranged at the bottom of the pressing cover, the positioning shaft is embedded into an inner hole in the top of a hollow gear shaft, and the pressing cover is pressed on the top of the hollow gear shaft; a bearing platform is arranged on the column body, a positioning spline is arranged on the outer side face of the top of the column body, the upper portion of the column body is embedded into an inner hole in the tail of the hollow gear shaft, the positioning spline is matched with an inner spline of the hollow gear shaft to limit rotation of the hollow gear shaft, and the bottom of the hollow gear shaft is placed on the bearing platform. And a tip II on a base of the gear hobbing machine is propped against the positioning hole II. The tool clamp is reasonable in design and simple in structure, the hollow gear shaft is fixed through the tool clamp, and the hollow gear shaft is fixed by clamping the tool clamp through the upper tip and the lower tip of the gear hobbing machine.

Description

Technical Field

[0001] The utility model relates to a fixture for a hollow gear shaft of a hobbing machine, belonging to the technical field of fixtures. Background Art

[0002] A fixture is a commonly used auxiliary tool in machining, and its main function is to position and fix parts. When a hobbing machine processes a gear shaft, it is necessary to position and fix the gear shaft by the upper and lower centers of the hobbing machine against the two ends of the gear shaft. In the prior art, when machining a hollow gear shaft, since the hollow gear shaft is hollow, the upper and lower centers of the hobbing machine cannot position and fix the workpiece, and the hobbing machine cannot machine the external spline of the hollow gear shaft. Therefore, a fixture for a hollow gear shaft of a hobbing machine is proposed. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a fixture for a hollow gear shaft of a hobbing machine. The hollow gear shaft is fixed by the fixture, and the upper and lower centers of the hobbing machine are against the two ends of the fixture, so as to realize the fixation and positioning of the hollow gear shaft, and solve the problem that the hobbing machine cannot machine the external spline of the hollow gear shaft in the background art.

[0004] The technical solution of the utility model is as follows:

[0005] A fixture for a hollow gear shaft of a hobbing machine includes a gland and a fixed seat. The gland includes a first positioning hole, a pressing cover and a positioning shaft. The first positioning hole is arranged on the top end face of the pressing cover, and the center of the hobbing machine abuts against the first positioning hole. The bottom of the pressing cover is provided with a positioning shaft, and the positioning shaft is embedded into the inner hole at the top of the hollow gear shaft, and the pressing cover presses against the top of the hollow gear shaft. The fixed seat includes a positioning spline, a bearing block, a second positioning hole and a cylinder. The cylinder is provided with a bearing block, and the outer side surface of the top of the cylinder is provided with a positioning spline. The machining accuracy of the positioning spline is higher than that of the spline of the hollow gear shaft. The upper part of the cylinder is embedded into the inner hole at the tail of the hollow gear shaft, and the positioning spline is matched with the internal spline of the hollow gear shaft to limit the rotation of the hollow gear shaft. The bottom of the hollow gear shaft is placed on the bearing block, and the second positioning hole is arranged on the bottom end face of the cylinder. The center two on the base of the hobbing machine abuts against the second positioning hole.

[0006] Further, a plurality of radially distributed protrusions are arranged outside the center two on the base, and the bottom surface of the fixed seat contacts with the protrusions on the base.

[0007] Further, both the first positioning hole and the second positioning hole are conical holes.

[0008] Further, the diameter of the pressing cover is larger than the inner hole diameter of the hollow gear shaft.

[0009] Further, the center lines of the first positioning hole, the second positioning hole and the hollow gear shaft coincide and are always located on the center line connecting the tips of the first center point and the second center point.

[0010] Further, the bearing platform is a frustum of a cone, which is arranged in the middle of the column body, and the diameter of the bearing platform is larger than the outer diameter of the tail of the hollow gear shaft.

[0011] Further, after the gland, the hollow gear shaft and the fixed seat are mutually engaged, the three are combined into a cylindrical body with the same center line.

[0012] The positive effects of the present utility model: The present utility model is reasonably designed and has a simple structure. The hollow gear shaft is fixed by a tooling fixture, and the hollow gear shaft is fixed by the upper and lower center points of the hobbing machine clamping the tooling fixture. The hollow gear shaft can rotate synchronously with the base of the hobbing machine, making the processing of the hollow gear shaft more convenient. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is Figure 1 a cross-sectional view;

[0015] Figure 3 is a schematic structural diagram of the gland of the present utility model;

[0016] Figure 4 is a schematic structural diagram of the fixed seat of the present utility model;

[0017] In the figure: 1. The first center point; 2. Gland; 21. The first positioning hole; 22. Compression gland; 23. Positioning shaft; 3. Hollow gear shaft; 4. Fixed seat; 41. Positioning spline 42. Bearing platform; 43. The second positioning hole; 44. Column body; 5. The second center point; 6. Base. Detailed Embodiment

[0018] The following further describes the present utility model with reference to the drawings and embodiments:

[0019] Referring to the attached Figures 1-4 , in this embodiment, the second center point 5 of the hobbing machine is installed on the base 6 of the hobbing machine and can be telescopic, and the first center point 1 is installed on the clamping arm of the hobbing machine and can move up and down. The middle of the hollow gear shaft 3 is hollow, and splines are provided on the inner side of the tail.

[0020] The hollow gear shaft tooling fixture for the above hobber includes a gland 2 and a fixed seat 4. The gland 2 comprises a first positioning hole 21, a pressing cover 22 and a positioning shaft 23. A conical first positioning hole 21 is provided on the top end face of the pressing cover 22, and the first center point 1 of the hobber abuts against the conical vertex of the first positioning hole 21. A positioning shaft 23 is provided at the bottom of the pressing cover 22, and the positioning shaft 23 is inserted into the top inner hole of the hollow gear shaft 3. The pressing cover 22 presses against the top of the hollow gear shaft 3 to fix the hollow gear shaft 3.

[0021] The fixed seat 4 comprises a positioning spline 41, a bearing block 42, a second positioning hole 43 and a cylinder 44. A bearing block 42 is provided at the middle position of the cylinder 44. A positioning spline 41 is provided on the outer side of the top of the cylinder 44. The machining accuracy of the positioning spline 41 is higher than that of the spline of the hollow gear shaft 2. The upper part of the cylinder 44 is inserted into the tail inner hole of the hollow gear shaft 3. The positioning spline 41 cooperates with the inner spline at the tail of the hollow gear shaft 3 to restrict the rotation of the hollow gear shaft 3. The bottom of the hollow gear shaft 3 is placed on the bearing block 42. A conical second positioning hole 43 is provided on the bottom end face of the cylinder 44, and the second center point 5 on the base 6 of the hobber abuts against the conical vertex of the second positioning hole 43 to position the tooling.

[0022] A plurality of radially distributed protrusions are provided outside the second center point 5 on the base 6, and the fixed seat 4 contacts the protrusions on the base 6 to increase the friction force.

[0023] Preferably, both the first positioning hole 21 and the second positioning hole 43 are conical holes, which respectively match the first center point 1 and the second center point 5.

[0024] Preferably, the diameter of the pressing cover 22 is larger than the inner hole diameter of the hollow gear shaft 3, and the pressing cover 22 presses against the top of the hollow gear shaft 3.

[0025] Preferably, the centers of the first positioning hole 21 and the second positioning hole 43 coincide with the center line of the hollow gear shaft 3 and are always located on the center line connecting the first center point 1 and the second center point 5.

[0026] Preferably, the bearing block 42 is a frustum of a cone, which is provided at the middle position of the cylinder 44, and the diameter of the bearing block 42 is larger than the outer diameter of the tail of the hollow gear shaft 3.

[0027] Preferably, after the gland 2, the hollow gear shaft 3 and the fixed seat 4 are mutually engaged, the three are combined into a cylindrical body with the same center line.

[0028] In this embodiment, the first positioning hole 21 is a conical hole located at the center of the top of the pressing cover 22. A positioning shaft 23 is provided at the bottom of the pressing cover 22. The first positioning hole 21, the pressing cover 22, and the positioning shaft 23 are all concentric. The diameter of the pressing cover 22 is larger than that of the positioning shaft 23, and at the same time, the diameter of the pressing cover 22 is larger than the inner hole diameter at the top of the hollow gear shaft 3. The diameter of the positioning shaft 23 matches the inner hole diameter of the hollow gear shaft 3.

[0029] The positioning spline 41 matches the internal spline at the tail of the hollow gear shaft 3. The diameter of the bearing block 42 is larger than the outer diameter at the tail of the hollow gear shaft 3. A plurality of radially distributed protrusions are provided on the outside of the second center point 5 on the base 6, and the protrusions are in contact with the bottom surface of the fixed seat 4 to increase the friction force. The second positioning hole 43 is a conical hole and is concentric with the bottom surface of the column 44.

[0030] The specific use process of this utility model is as follows:

[0031] During the fixing operation, the positioning shaft 23 on the pressing cover 2 is inserted into the inner hole at the top of the hollow gear shaft 3, and the pressing cover 22 covers the top of the hollow gear shaft 3. The upper part of the column 44 is inserted into the inner hole at the tail of the hollow gear shaft 3, and the positioning spline 41 cooperates with the internal spline at the tail of the hollow gear shaft 3 to limit the rotation of the hollow gear shaft 3. The hollow gear shaft 3 is placed entirely on the bearing block 42. During the positioning operation, the first center point 1 abuts against the conical vertex of the first positioning hole 21, and the second center point 5 abuts against the conical vertex of the positioning hole 43. The center line of the hollow gear shaft 3 is always located on the line connecting the tips of the first center point 1 and the second center point 5. The first center point 1 is clamped by the clamping arm of the hobbing machine and moves downward. The pressing cover 22 presses the hollow gear shaft 3, and the hollow gear shaft 3 presses the bearing block 42. The fixed seat 4 squeezes the second center point 5, causing the second center point 5 to shrink downward. The protrusions on the base 6 are in contact with the bottom surface of the fixed seat 4, and the multiple protrusions on the base 6 increase the friction force between the fixed seat 4 and the base 6. When the first center point 1 presses downward, the center line of the hollow gear shaft 3 is always located on the line connecting the tips of the first center point 1 and the second center point 5. When the fixed seat 4 presses the protrusions on the base 6, after the pressing cover 2, the hollow gear shaft 3, and the fixed seat 4 are mutually engaged, the three are combined into a cylindrical body with the same center. The rotation of the base 6 drives the rotation of the fixed seat 4. The positioning spline 41 of the fixed seat 4 is in close cooperation with the internal spline at the tail of the hollow gear shaft 3, driving the rotation of the hollow gear shaft 3, and the hollow gear shaft can rotate synchronously with the base of the hobbing machine. This ensures the machining of the external spline of the hollow gear shaft 3 by the hobbing machine.

Claims

1. A hollow gear shaft tooling fixture for a hobbing machine, characterized in that: It includes a gland (2) and a fixing base (4). The gland (2) comprises a first positioning hole (21), a pressing cover (22) and a positioning shaft (23). The first positioning hole (21) is provided on the top end face of the pressing cover (22). The first center point (1) of the hobbing machine is pressed into the first positioning hole (21). The positioning shaft (23) is provided at the bottom of the pressing cover (22). The positioning shaft (23) is embedded into the inner hole at the top of the hollow gear shaft (3). The pressing cover (22) presses on the top of the hollow gear shaft (3). The fixing base (4) comprises a positioning spline (41), a bearing platform (42), a second positioning hole (43) and a cylinder (44). The bearing platform (42) is provided on the cylinder (44). The positioning spline (41) is provided on the outer side face at the top of the cylinder (44). The upper part of the cylinder (44) is embedded into the inner hole at the tail of the hollow gear shaft (3). The positioning spline (41) is matched with the internal spline of the hollow gear shaft (3) to restrict the rotation of the hollow gear shaft (3). The bottom of the hollow gear shaft (3) is placed on the bearing platform (42). The second positioning hole (43) is provided on the bottom end face of the cylinder (44). The second center point (5) on the base (6) of the hobbing machine is pressed on the second positioning hole (43).

2. The hollow gear shaft tooling fixture for a hobbing machine according to claim 1, characterized in that: A plurality of radially distributed protrusions are provided outside the second center point (5) on the base (6). The bottom surface of the fixing base (4) contacts the protrusions on the base (6).

3. A hollow gear shaft tooling fixture for a hobbing machine according to claim 1 or 2, characterized in that: Both the first positioning hole (21) and the second positioning hole (43) are conical holes.

4. A hollow gear shaft tooling fixture for a hobbing machine according to claim 1 or 2, characterized in that: The diameter of the pressing cover (22) is larger than the inner hole diameter of the hollow gear shaft (3).

5. The fixture for the hollow gear shaft of a hobbing machine according to claim 1 or 2, characterized in that: The center lines of the first positioning hole (21), the second positioning hole (43) and the hollow gear shaft (3) coincide and are always located on the center point connection line of the first center point (1) and the second center point (5).

6. The hollow gear shaft tooling fixture for a hobbing machine according to claim 1 or 2, characterized in that: The bearing platform (42) is a frustum of a cone and is arranged at the middle position of the cylinder (44). The diameter of the bearing platform (42) is larger than the outer diameter of the tail of the hollow gear shaft (3).

7. A hollow gear shaft tooling fixture for a hobbing machine according to claim 1 or 2, characterized in that: After the gland (2), the hollow gear shaft (3) and the fixing base (4) are mutually embedded, the centers of the three are on the same straight line, and the three are combined into an integral cylinder.

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