Sun gear tool

Abstract

The application relates to the technical field of workpiece clamping devices, in particular to a sun gear tool which comprises a pressing block, a bottom plate and an equal-height block detachably connected to the bottom plate, further comprises a rotating centering structure detachably connected with the bottom plate, the rotating centering structure comprises a mandrel detachably connected with the bottom plate, a sliding piece and a rotating piece, the mandrel comprises an upper mandrel and a lower mandrel which are screw-connected, and the rotating piece is used for unlocking the sliding state of the sliding piece; through the rotating centering structure, the centering alignment before gear machining can be realized, so as to ensure the precision of the machined gear.

Description

Technical Field

[0001] This invention relates to the field of workpiece clamping device technology, specifically a sun gear tooling. Background Technology

[0002] The sun gear is a gear shaft in a planetary gear system that serves as the power input end, stably transmitting torque to the planet gears meshing with it and the ring gear meshing outside the planet gears. The sun gear is typically manufactured using a generating method (such as gear hobbing and grinding), which involves machining the gear shape by interlocking the workpiece blank and the cutting tool. To ensure gear accuracy during machining, a positioning fixture is needed to position the sun gear. Existing positioning fixtures often use nuts and clamping blocks to lock the gear blank onto a positioning seat, as shown in publication number CN105269084B (Clamping Fixture for Large Gears). However, the following technical problems still exist:

[0003] If the workpiece cannot be properly aligned during clamping, the workpiece's central axis will not coincide with the rotation center line of the positioning seat, resulting in poor runout accuracy of the machined gear. Summary of the Invention

[0004] This invention provides a sun gear tooling with a retraction function to solve the problem in the prior art that the gear cannot be centered and aligned during clamping and positioning.

[0005] This application provides the following technical solution: a sun gear tooling, including a clamping block, a base plate and a height equalizing block detachably connected to the base plate, and a rotation centering structure detachably connected to the base plate. The rotation centering structure includes a mandrel, a sliding member and a rotating member detachably connected to the base plate. The mandrel includes an upper mandrel and a lower mandrel connected by threads. The rotating member is used to unlock the sliding state of the sliding member.

[0006] Beneficial effects: The rotating component can unlock the sliding component, allowing the sliding component to radially position the workpiece by sliding. When the workpiece is placed on the leveling block, the height of the leveling block can be adjusted to make the workpiece level, thereby improving the tooth accuracy after the workpiece is machined.

[0007] Furthermore, the sliding component includes a T-shaped block that is slidably connected to the base plate, and the rotating component includes a positioning rod that is threadedly connected to the T-shaped block and an adjusting nut that is threadedly connected to the positioning rod. The positioning rod includes a smooth rod section and a threaded section. The threaded section of the positioning rod is threadedly connected to the T-shaped block, and the adjusting nut is located on the threaded section between the T-shaped block and the smooth rod section.

[0008] Beneficial effects: The height of the positioning rod can be changed as needed to adapt to workpieces with different tooth heights. The T-block can drive the positioning rod to slide on the base plate to adjust the position of the positioning rod. The adjusting nut is used to lock the positioning rod. After the workpiece is inserted into the mandrel, it moves towards the positioning rod to achieve rough positioning of the workpiece. The center axis of the workpiece is nearly coincident with the rotation center line of the base plate. Then, a dial indicator is used to align the outer circle of the workpiece to shorten the alignment time.

[0009] Furthermore, the upper mandrel has an axial through hole at its center, and the lower mandrel has a blind hole at one end. One end of the upper mandrel is threaded into the blind hole of the lower mandrel. The rotating component includes an impeller that can rotate circumferentially within the blind hole and a rotating shaft fixedly connected to the center of rotation of the impeller. One end of the rotating shaft extends vertically into the bottom of the blind hole and is rotatably connected to the lower mandrel, while the other end extends into the axial through hole and is rotatably connected to the upper mandrel. The sliding component includes two sliders symmetrically arranged on the inner wall of the blind hole and a tension spring hooked between the two sliders. The sliders can slide radially along the inner wall of the blind hole. Pins are fixed on both sides of the sliders extending out of the inner wall of the blind hole, and the tension spring is hooked between the pins on the same side.

[0010] Beneficial effects: By inserting an Allen wrench into the hexagonal hole and rotating the shaft, the impeller rotates. When the impeller rotates to a certain position, it will contact the inner end faces of the two sliders, causing the two sliders to expand away from the shaft and press against the inner wall of the workpiece. This radially adjusts the position of the workpiece, making the central axis of the workpiece slowly approach and nearly coincide with the rotation center line of the base plate, thereby reducing the outer diameter runout of the workpiece during rotation and improving the radial runout accuracy of the gear during machining.

[0011] Furthermore, the base plate is disc-shaped, and four evenly distributed U-shaped grooves are provided on the circumference of the base plate near the edge, the U-shaped grooves being sink grooves.

[0012] Beneficial effects: The base plate can be fixed to the workbench by screws passing through the U-shaped groove, and the screw connection facilitates disassembly and assembly.

[0013] Furthermore, the base plate has multiple positioning threaded holes of equal height with different center distances evenly distributed on its inner circumference.

[0014] Beneficial effects: By adjusting the center distance of the equal height blocks, it can adapt to sun gears with different tooth tip circles. The threaded connection makes disassembly and disassembly convenient, improving the switching efficiency of the corresponding equal height blocks when changing products.

[0015] Furthermore, the outer circular surface of the base plate is provided with two T-shaped grooves that are radially opened towards the center of the base plate. The two T-shaped grooves are distributed at 90 degrees on the circumference, and the openings of the T-shaped grooves face upwards. The T-shaped block can slide inside the T-shaped grooves.

[0016] Beneficial effects: The positioning rod can slide within the T-slot, and its position can be adjusted according to different sizes of sun gears.

[0017] Furthermore, the leveling block includes a cylindrical pad section and a screw section vertically fixed below the pad section. The cylindrical pad section has a horizontally opened cross-shaped through hole, and the screw section can cooperate with the leveling block positioning threaded hole on the base plate.

[0018] Beneficial effects: The workpiece is placed on top of the leveling block, which can adjust the height of the workpiece to keep it level and ensure the accuracy of the workpiece during processing.

[0019] Furthermore, the clamping block is inserted at the end of the upper mandrel away from the lower mandrel, and the outer diameter of the clamping block is larger than the inner hole of the workpiece and smaller than the root diameter of the workpiece's teeth.

[0020] Beneficial effects: The clamping block will not interfere with the machining tool, and it can be locked with a nut to press the workpiece firmly onto the base plate. Attached Figure Description

[0021] Figure 1 This is a front view of Embodiment 1 of the present invention;

[0022] Figure 2 This is the front view of the base plate in section 1;

[0023] Figure 3 This is the front view of Embodiment 2;

[0024] Figure 4 for Figure 3 Enlarged view of a portion of the rotational centering structure;

[0025] Figure 5 for Figure 4 Top view;

[0026] Figure 6 This is the front view of Embodiment 3;

[0027] Figure 7 This is a front view of Example 3 when the raised arc and the arc notch are completely matched. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method:

[0029] The markings in the accompanying drawings include: base plate 1, U-shaped groove 101, T-shaped groove 102, leveling block positioning threaded hole 103, leveling block 2, sun wheel 3, clamping block 4, locking nut 5, spindle 6, upper spindle 61, lower spindle 62, positioning rod 7, adjusting nut 8, T-shaped block 9, slider 10, pin 11, tension spring 12, impeller 13, long arc 131, raised arc 132, rotating shaft 14, hexagonal hole 15, and arc notch 16.

[0030] Example 1

[0031] like Figure 1 As shown, a sun gear tooling includes a clamping block 4, a base plate 1 screwed to the worktable, a leveling block 2 threaded to the inner circumference of the base plate 1, and a rotation centering structure threaded to the base plate 1.

[0032] like Figure 1 and Figure 2 As shown, the base plate 1 is disc-shaped. Four U-shaped grooves 101 are evenly distributed on the circumference of the base plate 1 near the edge. The U-shaped grooves 101 are countersunk grooves used to fix the base plate 1 to the workbench with screws. Two T-shaped grooves 102 are provided on the outer circumference of the base plate 1, which are radially opened towards the center of the base plate 1. The openings of the T-shaped grooves 102 face upwards, and the two T-shaped grooves 102 are distributed at 90 degrees on the circumference. Multiple equal-height block positioning threaded holes 103 with different center distances are evenly distributed on the inner circumference of the base plate 1.

[0033] like Figure 1 As shown, the leveling block 2 includes a cylindrical pad section and a screw section vertically fixed below the pad section. The pad section is a cylinder with a horizontally opened cross-shaped through hole. The cross-shaped through hole can be used to insert a rod-shaped tool, which facilitates rotating the leveling block 2 to adjust the height between the leveling block 2 and the base plate 1. The screw section can cooperate with the leveling block positioning threaded hole 103 on the base plate 1.

[0034] like Figure 1 As shown, the rotary centering structure includes a sliding component, a rotating component, and a mandrel 6 threadedly connected to the center of the base plate 1. The mandrel 6 includes an upper mandrel 61 and a lower mandrel 62, which can be integrated by threaded connection. The sliding component includes a T-block 9 slidably connected to the T-slot 102. The T-block 9 can slide radially along the T-slot 102 on the base plate 1. The rotating component includes a positioning rod 7 threadedly connected above the T-block 9 and an adjusting nut 8 threadedly connected to the positioning rod 7. The positioning rod 7 includes a smooth rod section and a threaded section. The threaded section passes vertically downward through the adjusting nut 8 and a washer and is then threadedly connected to the T-block 9. Tightening the adjusting nut 8 can fix the T-block 9 on the base plate 1. Loosening the adjusting nut 8 can adjust the position of the T-block 9 in the T-slot 102 according to the workpiece with different outer diameters. The outer circumference of the lower section of the workpiece is pressed against the smooth rod sections of the two positioning rods 7 to achieve coarse positioning of the workpiece.

[0035] like Figure 1 As shown, the clamping block 4 is sleeved on the upper end of the upper mandrel 61, located between the locking nut 5 and the sun gear 3. The workpiece is clamped by tightening the locking nut 5. The outer diameter of the clamping block 4 is larger than the inner hole of the workpiece and smaller than the root diameter of the workpiece's teeth, which can avoid interference with the machining tool during workpiece machining.

[0036] In use, insert the inner hole of the sun gear 3 into the mandrel 6 and place it on the leveling block 2. Push the sun gear 3 radially so that the outer circumference of the lower section of the sun gear 3 abuts against the smooth surfaces of the two fixed positioning rods 7, thus completing the coarse positioning of the sun gear 3. Loosen the adjusting nut 8, move the positioning rod 7 away from the workpiece by 5-10 mm, and then tighten it. Use two dial indicators to check the radial runout of the upper and lower parts of the outer circumference of the sun gear 3. Use a copper rod to tap the outer circumference of the sun gear to adjust the radial position of the sun gear 3 until the runout of the outer circumference of the workpiece is qualified. Install the locking nut 5 and tighten it to complete the centering and alignment of the sun gear 3. When the perpendicularity between the outer circumference of the workpiece and the end face is poor, the runout of the outer circumference of the workpiece will always be unqualified. At this time, according to the readings of the upper and lower dial indicators, it can be determined which side of the workpiece is lower. Adjust the height of the leveling block 2 where the lower side of the workpiece is located until the runout of the outer circumference of the workpiece is qualified. Install the locking nut 5 and tighten it to complete the centering and alignment of the sun gear 3.

[0037] Example 2

[0038] like Figures 3 to 5 As shown, the difference between this embodiment and Embodiment 1 lies in the rotation centering structure. Specifically, the upper mandrel 61 in the rotation centering structure has an axial through hole at its center, and the upper end of the lower mandrel 62 has a blind hole. The lower end of the upper mandrel 61 is threaded into the blind hole of the lower mandrel 62. The rotating component in the rotation centering structure includes an impeller 13 that can rotate circumferentially within the blind hole and a rotating shaft 14 fixedly connected to the rotation center of the impeller 13. One end of the rotating shaft 14 extends vertically into the bottom of the blind hole and is rotatably connected to the lower mandrel 62, while the other end extends into the axial through hole and is rotatably connected to the upper mandrel 61. The end of the rotating shaft 14 that extends into the axial through hole of the upper mandrel 61 has a hexagonal hole 15, into which a corresponding Allen wrench can be inserted to facilitate rotating the rotating shaft 14. The sliding component includes two sliding members symmetrically arranged on the inner wall of the blind hole of the lower mandrel 62. Two identical semi-circular sliders 10 and a tension spring 12 hooked between the two sliders 10. The sliders 10 can slide radially along the inner wall of the blind hole. The two semi-circular arcs of the two sliders 10 face the inner wall of the sun gear 3. Pins 11 are fixed on the two sides of the sliders 10 extending out of the inner wall of the blind hole. The pins 11 are perpendicular to the sides of the sliders 10. A tension spring 12 is hooked between the pins 11 on the same side of the two sliders 10. The longest distance between the two arc segments of the impeller 13 is greater than the distance between the inner end faces of the two sliders 10 in the natural state of the tension spring 12. This allows the two arc segments of the impeller 13 to open up the two sliders 10 when the shaft 14 drives the impeller 13 to rotate. When the two sliders 10 are opened to their longest distance, the distance between their two semi-circular arcs is slightly less than the inner diameter of the sun gear 3, so that the two semi-circular arcs can just abut against the inner wall of the sun gear 3.

[0039] In use, as in Example 1, place the sun wheel 3 and adjust the leveling block 2 to keep the sun wheel 3 workpiece horizontal. Insert an Allen wrench into the hexagonal hole 15 at the upper end of the upper mandrel 61 and rotate the Allen wrench to drive the impeller 13 to rotate, so that the two arc surfaces of the impeller 13 open the two sliders 10. Since the two sliders 10 expand outward at the same time, the semi-circular surface of the slider 10 closest to the inner wall of the sun wheel 3 first abuts against the inner wall of the sun wheel 3 and pushes the sun wheel 3 radially, so that its central axis gradually approaches and nearly coincides with the rotation center line of the base plate 1. After rotating the shaft 14 several times, the workpiece no longer moves radially, indicating that it has been centered and aligned. When rotating the shaft 14, use your sense of touch to keep the arc section of the impeller 13 away from the inner end face of the two sliders 10. The tension spring 12 causes the two sliders 10 to retract inward, and the semi-circular surface of the slider 10 no longer abuts against the inner wall of the sun wheel 3. After processing, the sun wheel 3 can be easily removed.

[0040] Example 3

[0041] like Figure 6 and Figure 7 As shown, the difference between this embodiment and Embodiment Two lies in the different shapes of the impeller 13 and slider 10 in the rotation centering structure. Specifically, the single-sided shape of the impeller 13 is a long arc 131 plus a raised arc 132, and one side of the inner end face of the slider 10 has an arc notch 16 that matches the raised arc 132. When the impeller 13... Figure 6 The longitudinal position shown is rotated to Figure 7 In the lateral position shown, the raised arc 132 is just embedded in the arc notch 16. At this time, the two sliders 10 are stretched to their maximum distance, and the arc notch 16 limits the raised arc 132, preventing the impeller 13 from moving further. Figure 7 Continue rotating in the direction indicated by the middle arrow. Compared to Embodiment 2, this solution does not require multiple rotations of the impeller 13 to more accurately find the longest distance at which the two sliders 10 are spread apart, so that the axis of the sun gear 3 is nearly coincident with the rotation center line of the base plate 1.

[0042] The above are merely embodiments of the present invention. The invention is not limited to the fields covered by these embodiments, and common knowledge regarding specific structures and characteristics is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sun gear tooling, comprising a clamping block, a base plate, and a leveling block detachably connected to the base plate, characterized in that: It also includes a rotation centering structure detachably connected to the base plate. The rotation centering structure includes a mandrel, a sliding member, and a rotating member detachably connected to the base plate. The mandrel includes an upper mandrel and a lower mandrel that are threaded together. The rotating member is used to unlock the sliding state of the sliding member. The upper mandrel has an axial through hole at its center, and the lower mandrel has a blind hole at one end. One end of the upper mandrel is threaded into the blind hole of the lower mandrel. The rotating component includes an impeller that can rotate circumferentially within the blind hole and a rotating shaft fixedly connected to the center of rotation of the impeller. One end of the rotating shaft extends vertically into the bottom of the blind hole and is rotatably connected to the lower mandrel, while the other end extends into the axial through hole and is rotatably connected to the upper mandrel. The end of the rotating shaft that extends into the axial through hole of the upper mandrel has a hexagonal hole at its head. The sliding component includes two sliders symmetrically arranged on the inner wall of the blind hole and a tension spring hooked between the two sliders. The sliders can slide radially along the inner wall of the blind hole. Pins are fixed on both sides of the sliders extending out of the inner wall of the blind hole, and the tension spring is hooked between the pins on the same side. The impeller has a single-sided shape consisting of a long arc and a raised arc, and one side of the inner end face of the slider has an arc notch that matches the raised arc. The clamping block is inserted at the end of the upper mandrel away from the lower mandrel, and the outer diameter of the clamping block is larger than the inner hole of the workpiece and smaller than the root diameter of the workpiece's teeth.

2. The sun gear tooling according to claim 1, characterized in that: The base plate is disc-shaped, and four evenly distributed U-shaped grooves are provided on the circumference of the base plate near the edge. The U-shaped grooves are sink grooves.

3. The sun gear tooling according to claim 2, characterized in that: The base plate has multiple positioning threaded holes of equal height with different center distances evenly distributed on its inner circumference.

4. The sun gear tooling according to claim 3, characterized in that: The leveling block includes a cylindrical pad section and a screw section vertically fixed below the pad section. The cylindrical pad section has a horizontally opened cross-shaped through hole, and the screw section can cooperate with the leveling block positioning threaded hole on the base plate.

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