Gear internal spline slotting device

Abstract

The utility model relates to a gear internal spline slotting device which comprises a supporting table, a gear positioning mechanism is arranged on the supporting table, and a slotting driving mechanism and a slotting cutter are arranged above the gear positioning mechanism. The slotting tool comprises a horizontally-arranged tool containing disc, the tool containing disc is connected with a rotation driving mechanism, a plurality of tool containing holes which are evenly distributed around the center of the tool containing disc in a circumferential shape are formed in the tool containing disc, a slotting tool which is in sliding fit with the tool containing hole is arranged in each tool containing hole, and a spring is arranged between each slotting tool and the tool containing disc. The outer wall of the lower portion of each slotting tool is provided with a plurality of spline slotting teeth which are evenly distributed around the slotting tool in a circumferential mode, and the heights of the spline slotting teeth of the slotting tools are gradually increased in the rotating direction of the cutter installing disc. The driving shaft is coaxial with one slotting tool, and the positioning center of the gear positioning mechanism is coaxial with the driving shaft. The spline slotting tool can machine a plurality of spline grooves of a spline at the same time, machining efficiency is improved, and the temperature of the slotting tool is prevented from being too high.

Description

Technical Field

[0001] This utility model belongs to the field of gear processing equipment, and in particular to a gear internal spline cutting device. Background Technology

[0002] Internal splines on gears are typically machined using broaching or planing. Planing allows for sequential machining of each keyway within the internal spline, but it is less efficient and requires radial feed, causing the spline depth to gradually increase until the required depth is reached. Existing planing devices use a single cutting tool with shaping teeth on its outer wall. A drive mechanism moves the tool downwards, and the shaping teeth cut away material from the inner wall of the gear, creating a groove. During planing, the temperature of the shaping teeth rises, leading to performance degradation and affecting machining accuracy and service life. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a gear internal spline cutting device that can process multiple keyways of splines simultaneously, improve processing efficiency, and avoid excessive temperature of the cutting tool.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a gear internal spline cutting device, including a support platform, a gear positioning mechanism is provided on the support platform, a cutting drive mechanism is provided above the gear positioning mechanism, the cutting drive mechanism is connected to a vertical drive shaft, and a cutting tool is provided below the drive shaft.

[0005] The planing tool includes a horizontally arranged tool holder, which is connected to a rotation drive mechanism. The tool holder has multiple tool holes evenly distributed in a circular pattern around its center. Each tool hole contains a planing cutter that slides within it. A spring is provided between each planing cutter and the tool holder. The lower outer wall of each planing cutter has multiple splined teeth evenly distributed in a circular pattern around it. The height of the splined teeth increases progressively in the rotation direction of the tool holder. The drive shaft is coaxial with one of the planing cutters, and the positioning center of the gear positioning mechanism is coaxial with the drive shaft.

[0006] Furthermore, the tool holder is mounted on the support platform via a plane bearing.

[0007] Furthermore, the rotation drive mechanism is a geared motor.

[0008] Furthermore, a horizontal support plate is fixedly provided at the top of each inserter, and the spring is provided on the lower surface of the support plate.

[0009] Furthermore, the support plate is provided with a frustum-shaped guide hole, and the lower end of the drive shaft is a frustum-shaped guide post, the size of which is adapted to the size of the guide hole.

[0010] Furthermore, the insert includes a drive section and a cutting section, the spline teeth are integrally formed with the cutting section, and the cutting section is detachably connected to the drive section.

[0011] Furthermore, the gear positioning mechanism is a three-jaw chuck.

[0012] Furthermore, the inner wall of the jaws of the three-jaw chuck is provided with a horizontal support boss.

[0013] The beneficial effects of this utility model are: 1. By setting multiple spline teeth on the cutter, each spline tooth can process a keyway. When the cutter moves downward, each spline tooth can process multiple keyways at the same time, thereby improving the processing efficiency of internal splines.

[0014] 2. The keyway depth is gradually increased by first using a cutter with the smallest spline tooth height, followed by cutters with progressively larger spline tooth heights, until the required depth is achieved. Each cutter has a relatively long rest period after each cut, allowing for thorough cooling and preventing overheating that could affect cutting performance. No additional cooling measures are required during the cutting process, keeping the equipment structure simple. Attached Figure Description

[0015] Figure 1 This is a front sectional view of the present invention;

[0016] Figure 2 This is a top view of the tool holder;

[0017] Figure 3 This is a diagram of a knife insertion device;

[0018] Reference numerals: 1—Support platform; 2—Gear positioning mechanism; 3—Shaving drive mechanism; 4—Drive shaft; 5—Tool holder; 6—Rotation drive mechanism; 7—Shaving tool; 71—Drive section; 72—Shaving section; 8—Spring; 9—Spline shaping gear; 10—Surface bearing; 11—Support plate; 12—Guide hole; 13—Guide post; 14—Support boss. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] The gear internal spline planing device of this utility model, such as Figures 1 to 3As shown, the machine includes a support platform 1, which is horizontally positioned and can be made of a metal sheet of a certain thickness. A set of support legs is provided at the bottom of the support platform 1 to maintain it at a suitable height. A gear positioning mechanism 2 is provided on the support platform 1 to horizontally fix the gear to be machined (internal spline) on the support platform 1, ensuring the gear remains stable during the planing process. Above the gear positioning mechanism 2 is a planing drive mechanism 3, which is connected to a vertical drive shaft 4. A planing tool is positioned below the drive shaft 4. The planing drive mechanism 3 drives the drive shaft 4 and the planing tool to reciprocate up and down, allowing the planing tool to perform multiple planing operations. The planing drive mechanism 3 can adopt the crank-slider mechanism used in existing planing machines. The crank rotates under the drive of a motor, thereby pushing the slider to reciprocate linearly.

[0021] The planing tool of this utility model includes a horizontally arranged tool holder 5, which is a disc and rotatably mounted above a support platform 1. The tool holder 5 is connected to a rotation drive mechanism 6, which drives the tool holder 5 to rotate. The tool holder 5 has multiple tool holes evenly distributed circumferentially around its center. Each tool hole is a circular through hole, and a planer 7 is slidably fitted into each hole. The planer 7 is cylindrical, and its diameter is slightly smaller than the inner diameter of the gear to ensure it can extend into the gear's inner hole. A spring 8 is provided between each planer 7 and the tool holder 5, which pushes the planer 7 upward to reset. The lower outer wall of each planer 7 has multiple spline teeth 9 evenly distributed circumferentially around it. The number of spline teeth 9 is the same as the number of keyways in the gear's spline, and each spline tooth 9 can machine one keyway. In the rotation direction of the tool holder 5, the height of the spline teeth 9 of the cutter 7 increases progressively. The height of the spline teeth 9 refers to the radial distance from the sidewall of the spline teeth 9 away from the cutter 7 to the cutter 7. Each cutter 7 sequentially processes the spline inside the gear, resulting in a keyway with gradually increasing depth. The drive shaft 4 is coaxial with one of the cutters 7, and the positioning center of the gear positioning mechanism 2 is coaxial with the drive shaft 4 to ensure machining accuracy.

[0022] The working process of this utility model is as follows: The gear is fixed on the gear positioning mechanism 2 to ensure that the gear is coaxial with the drive shaft 4. Then, the rotation drive mechanism 6 drives the tool holder 5 to rotate. The tool holder 5 transports the tool 7 with the smallest spline shaping tooth 9 to the top of the gear. Then, the cutting drive mechanism 3 pushes the drive shaft 4 downward. After the lower end of the drive shaft 4 contacts the upper end of the tool 7, it pushes the tool 7 downward, so that the tool 7 enters the inner hole of the gear. At the same time, the spline shaping tooth 9 is cut to obtain the keyway. After one cutting is completed, the cutting drive mechanism 3 drives the drive shaft 4 to return to its original position, and the tool 7 returns to its original position under the action of the spring 8. Then, the rotation drive mechanism 6 drives the tool holder 5 to rotate at a set angle to transport the next tool 7 to the top of the gear for a second cutting. When all the tools 7 have completed one cutting, the keyway of the spline inside the gear is machined to the required process.

[0023] As can be seen, this invention can simultaneously process multiple keyways of an internal spline, which is beneficial to improving processing efficiency. Each cutter 7 has a relatively long rest period after completing one cutting operation, allowing for sufficient heat dissipation and cooling, effectively preventing the cutter 7 from overheating and affecting cutting performance. No additional cooling measures are required during the cutting process. Furthermore, this invention does not require a radial feed mechanism, keeping the equipment structure simplified.

[0024] In this invention, the tool holder 5 is mounted on the support platform 1 via a planar bearing 10. Specifically, a support frame can be provided on the support platform 1, and the planar bearing 10 is mounted on the support frame. The tool holder 5 is located on the upper surface of the planar bearing, so that the tool holder 5 is positioned above the gear positioning mechanism 2. The planar bearing 10 can withstand a large axial force, ensuring the stability of the tool holder 5.

[0025] In this utility model, the rotation drive mechanism 6 adopts a geared motor, and a rotating shaft can be set at the center of the tool loading disc 5. The geared motor can be connected to the rotating shaft through a gear set, which can drive the tool loading disc 5 to rotate.

[0026] To facilitate the installation of the spring 8, the upper end of the insert 7 extends above the tool holder 5, and the splined insert 9 is located below the tool holder 5. A horizontal support plate 11 is fixedly installed on the top of each insert 7, and the spring 8 is located on the lower surface of the support plate 11. The spring 8 can be sleeved on the outer wall of the insert 7.

[0027] To ensure that the drive shaft 4 is coaxial with the insert 7 below, the support plate 11 is provided with a frustum-shaped guide hole 12, and the lower end of the drive shaft 4 is a frustum-shaped guide post 13. The guide post 13 is integrally formed with the drive shaft 4, and the size of the guide post 13 is adapted to the size of the guide hole 12. During the downward movement of the drive shaft 4, the guide post 13 enters the guide hole 12. When the guide post 13 is not coaxial with the guide hole 12, the inclined surface of the outer wall of the guide post 13 can push the support plate 11 and the insert 7 to move, causing the tool mounting plate 5 to rotate adaptively until the drive shaft 4 and the insert 7 are coaxial. The gear positioning mechanism 2 is fixed on the support plate 1 and will not move horizontally. At the same time, the drive shaft 4 does not need to move horizontally. Therefore, it can be ensured that the positioning center of the gear positioning mechanism 2 is coaxial with the drive shaft 4. When the drive shaft 4 and the insert 7 are coaxial, the insert 7 can also be coaxial with the positioning center of the gear positioning mechanism 2.

[0028] The spline shaper 9 is a consumable part. To facilitate maintenance and replacement of the spline shaper 9, the cutter 7 includes a drive section 71 and a cutting section 72. The spline shaper 9 and the cutting section 72 are integrally formed. The cutting section 72 and the drive section 71 are detachably connected. The drive section 71 slides in conjunction with the tool holder 5. When the spline shaper 9 is damaged, the cutting section 72 can be removed and a new cutting section 72 can be installed. It is not necessary to remove the entire cutter 7, which facilitates maintenance.

[0029] The gear positioning mechanism 2 can be a clamping mechanism that clamps and fixes the gear to the support platform 1. As a preferred embodiment, the gear positioning mechanism 2 is a three-jaw chuck. The three-jaw chuck can automatically center itself to ensure that the gear is coaxial with the drive shaft 4.

[0030] During planing, the gear is subjected to a downward cutting force. To prevent axial movement of the gear and improve its stability, the inner wall of the jaws of the three-jaw chuck is provided with a horizontal support boss 14. During clamping, the gear is placed on the support boss 14, and then the outer circle of the gear is clamped by the jaws. With the support of the support boss 14, the gear can remain stable.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gear internal spline cutting device, comprising a support platform (1), a gear positioning mechanism (2) provided on the support platform (1), a cutting drive mechanism (3) provided above the gear positioning mechanism (2), the cutting drive mechanism (3) being connected to a vertical drive shaft (4), and a cutting tool provided below the drive shaft (4); characterized in that: The planing tool includes a horizontally arranged tool holder (5), which is connected to a rotation drive mechanism (6). The tool holder (5) has multiple tool holes evenly distributed in a circular shape around the center of the tool holder (5). Each tool hole contains a planing tool (7) that slides into the tool hole. A spring (8) is provided between the planing tool (7) and the tool holder (5). The lower outer wall of each planing tool (7) has multiple spline teeth (9) evenly distributed in a circular shape around the planing tool (7). The height of the spline teeth (9) of the planing tool (7) increases in the rotation direction of the tool holder (5). The drive shaft (4) is coaxial with one of the planing tools (7), and the positioning center of the gear positioning mechanism (2) is coaxial with the drive shaft (4).

2. The gear internal spline cutting device as described in claim 1, characterized in that: The tool holder (5) is mounted on the support platform (1) via a plane bearing (10).

3. The gear internal spline cutting device as described in claim 1, characterized in that: The rotation drive mechanism (6) is a geared motor.

4. The gear internal spline cutting device as described in claim 1, characterized in that: Each inserter (7) has a horizontal support plate (11) fixedly mounted on its top, and the spring (8) is mounted on the lower surface of the support plate (11).

5. The gear internal spline cutting device as described in claim 4, characterized in that: The support plate (11) is provided with a frustum-shaped guide hole (12), and the lower end of the drive shaft (4) is a frustum-shaped guide post (13). The size of the guide post (13) is adapted to the size of the guide hole (12).

6. The gear internal spline cutting device as described in claim 1, characterized in that: The inserter (7) includes a drive section (71) and a cutting section (72). The spline inserter (9) is integrally formed with the cutting section (72), and the cutting section (72) is detachably connected to the drive section (71).

7. The gear internal spline cutting device as described in claim 1, characterized in that: The gear positioning mechanism (2) is a three-jaw chuck.

8. The gear internal spline cutting device as described in claim 7, characterized in that: The inner wall of the jaws of the three-jaw chuck is provided with a horizontal support boss (14).

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