Gear shaping machine ball pull rod connecting structure and gear shaping machine tool

Abstract

The invention discloses a gear shaping machine ball pull rod connecting structure and a gear shaping machine tool, the gear shaping machine ball pull rod connecting structure comprises a ball hinge unit and a pull rod, the ball hinge unit comprises a ball tile assembly and a ball head movably installed in the inner space of the ball tile assembly, an avoiding hole is formed in the top of the ball tile assembly, the pull rod penetrates through the avoiding hole and then is connected with the ball head, and the ball head is provided with a through hole; a plunger is installed in the through hole and provided with an installation hole perpendicular to the axis of the plunger, a corresponding hole is formed in the top of the ball head, and the lower end of the pull rod penetrates through the corresponding hole and then is connected with the installation hole in the plunger. The problem that a traditional ball tie rod is prone to breakage due to stress concentration in heat treatment is solved, meanwhile, the plunger is installed through the through hole transversely formed in the center of the ball head, the plunger is connected with the tie rod, the problem that threads cannot be machined on a high-hardness ball head is solved, and the problems that an existing split ball tie rod is small in ball head stress face and insufficient in rigidity are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tools, and in particular to a gear shaping machine ball-pull rod connection structure and a gear shaping machine tool. Background Art

[0002] The cutter shaft of a gear shaping machine requires simultaneous up-and-down reciprocating motion and circular rotation and indexing during cutting. The drive box at the top of the cutter shaft provides the power for the up-and-down reciprocating motion through a crank-connecting rod mechanism, while the worm gear mechanism in the middle of the cutter shaft provides the power for the rotation and indexing. This requires a connection device that can not only connect the swing arm at the top, which reciprocates up and down and swings left and right, but also the cutter shaft at the bottom, which rotates continuously. Gear shaping machines generally use ball-and-tie rods for connection, but the traditional ball-and-tie rod structure has a ball head and tie rod that are integral. To improve the wear resistance of the ball head, the ball head is generally quenched. Due to stress concentration at the connection between the ball head and tie rod, fracture and damage often occur when subjected to the impact load of the gear shaping process.

[0003] While some split ball tie rods are available on the market, they typically directly thread the ball head onto the screw through the center hole and then lock the lower end with a nut, such as the ball tie rod structure disclosed in CN219324840U. While this structure can also achieve the function of a split ball tie rod, the lower end nut occupies most of the connection surface between the lower ball shell and the ball head, causing pressure on the lower ball shell during downward gear insertion. This structure reduces the rigidity of the integrated ball tie rod connection and accelerates fatigue damage to the ball head. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to solve the problems existing in the above-mentioned background technology, to provide a gear shaping machine ball tie rod connection structure and a gear shaping machine tool, to overcome the problem that traditional ball tie rods are prone to breakage due to stress concentration during heat treatment, to solve the problem that high-hardness ball heads cannot be processed with threads, and to solve the problem that the existing split ball tie rods have a small force-bearing surface and insufficient rigidity.

[0005] In order to achieve the above-mentioned technical features, the purpose of the present invention is achieved as follows: A ball-pull rod connection structure of a gear shaping machine includes a ball joint unit and a pull rod, the ball joint unit includes a ball shoe assembly and a ball head movably installed in the internal space of the ball shoe assembly, the top of the ball shoe assembly is provided with an avoidance hole, and the pull rod is connected to the ball head after passing through the avoidance hole, the ball head is provided with a through hole, a plunger is installed in the through hole, the plunger is provided with a mounting hole perpendicular to its axis, a corresponding hole is provided on the top of the ball head, and the lower end of the pull rod is connected to the mounting hole on the plunger after passing through the corresponding hole.

[0006] The ball bushing assembly includes a lower ball bushing, a sleeve body and an upper ball bushing connected in sequence from bottom to top. The ball head is movably installed in the spherical space formed between the upper ball bushing and the lower ball bushing. The avoidance hole is set on the upper ball bushing. The threaded end of the first screw passes through the screw holes on the upper ball bushing and the sleeve body, and then is screwed and fixed to the lower ball bushing.

[0007] The mounting hole is provided with an internal thread, the lower end of the pull rod is provided with a first external thread, and the lower end of the pull rod is screwed and fixed with the thread of the mounting hole.

[0008] A limiting hole is axially arranged on the plunger, and the limiting hole passes through the pull rod, and a cylindrical pin is installed in the limiting hole.

[0009] The plunger is respectively provided with set screws at both ends of the limiting hole, and the two ends of the cylindrical pin are respectively against the two set screws.

[0010] The upper end of the pull rod is connected to the rocker arm; the lower end of the rocker arm is provided with an insertion hole, the upper end of the pull rod is inserted into the insertion hole, and the bottom of the rocker arm is provided with an annular groove with the insertion hole as the center, the outer tapered sleeve is installed in the annular groove, and is tightened by a flange installed at the bottom of the rocker arm, and an inner tapered sleeve is installed inside the outer tapered sleeve, and the outer wall of the inner tapered sleeve is matched with the inner wall of the outer tapered sleeve through a conical surface, and a fracture is provided on the inner tapered sleeve, and the threaded end of the second screw passes through the hole of the outer tapered sleeve and is connected with the thread of the inner tapered sleeve, and a third screw is also screwed and installed on the outer tapered sleeve, and the threaded end face of the third screw is in contact with the lower end face of the inner tapered sleeve; the pull rod passes through the inner tapered sleeve.

[0011] The upper end of the pull rod is provided with a second external thread, the upper end of the penetration hole is provided with an internal thread, and the upper end of the pull rod is screwed to the penetration hole.

[0012] An oil hole is provided through the center of the pull rod, and an oil guide hole corresponding to the oil hole is provided on the top of the penetration hole of the rocker rod. The oil guide hole extends to the outer wall of the rocker rod, and an oil guide pipe is installed at one end of the oil guide hole located in the penetration hole. The oil guide pipe slides into the oil hole of the pull rod.

[0013] The upper end of the pull rod is provided with a sinking platform, a sealing sleeve is installed in the sinking platform, the inner circumference of the sealing sleeve is provided with a sealing groove, a sealing ring is installed in the sealing groove, and the lower end of the oil guide pipe passes through the sealing ring.

[0014] The lower end of the pull rod is spaced a distance from the through hole, and the plunger is provided with a notch on an outer wall located on one side of the lower end of the pull rod.

[0015] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: 1. The present invention installs a plunger in a through hole arranged horizontally in the center of the ball head, and the plunger is connected to the pull rod. This not only overcomes the problem of stress concentration and easy breakage of traditional ball pull rods during heat treatment, but also solves the problem that high-hardness ball heads cannot be processed with threads, as well as the problem that the ball head of the existing split ball pull rod has a small force-bearing surface and insufficient rigidity.

[0016] 2. The swing arm of the present invention adjusts the extended length of the pull rod through a thread, and the swing arm and the pull rod are locked by a tapered sleeve structure at the lower end of the swing arm. This can avoid grooving the threaded part of the swing arm, ensuring the integrity of the thread. At the same time, it can also be processed to ensure that the tapered sleeve mounting hole at the lower end of the swing arm is coaxial with the threaded hole, which can improve the coaxial accuracy of the pull rod and the swing arm after adjustment and locking. It has the characteristics of simple structure, good rigidity, high coaxiality, and stable and reliable performance.

[0017] 3. The present invention can inject oil into the oil hole through the oil guide hole, thereby lubricating the inside of the ball joint unit. The lower end of the oil guide pipe is slidably inserted into the oil hole of the pull rod, so that after the height position of the pull rod is adjusted, the ball joint unit can also be lubricated with oil.

[0018] 4. The present invention provides a sinking platform at the upper end of the pull rod, a sealing sleeve is installed in the sinking platform, a sealing groove is provided on the inner circumference of the sealing sleeve, a sealing ring is installed in the sealing groove, and the lower end of the oil guide pipe passes through the sealing ring to seal the oil guide pipe to prevent leakage between the oil guide pipe and the oil hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 for Figure 1 The AA cross-sectional structural diagram mainly shows the structure of the ball joint unit.

[0022] Figure 3 for Figure 1 The AA cross-sectional structural diagram mainly shows the connection structure between the pull rod and the rocker arm.

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point B in the middle.

[0024] Reference numerals: Ball joint unit 100, lower ball bearing 110, deposition hole 111, sleeve 120, upper ball bearing 130, avoidance hole 131, first screw 140, ball head 150, through hole 151, corresponding hole 152, notch 153; Plunger 160, mounting hole 161, limiting hole 162, connecting screw 170, cylindrical pin 180, set screw 190; Pull rod 200, first external thread 210, second external thread 220, oil hole 230, screwing portion 240; Rocker arm 300, penetration hole 310, annular groove 320, inner tapered sleeve 330, outer tapered sleeve 340, second screw 341, third screw 342, flange 350, fourth screw 351, window 360, oil guide hole 370, oil pipe joint 371, oil guide pipe 380, sealing sleeve 390, fifth screw 391, sealing ring 392; Blade shaft 400. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0027] Example 1: See also Figure 1-4 A ball-pull rod connection structure of a gear shaping machine includes a ball joint unit 100 and a pull rod 200. The ball joint unit 100 includes a ball shoe assembly and a ball head 150 movably installed in the internal space of the ball shoe assembly. An avoidance hole 131 is provided on the top of the ball shoe assembly. The pull rod 200 is connected to the ball head 150 after passing through the avoidance hole 131. The ball head 150 is provided with a through hole 151. A plunger 160 is installed in the through hole 151. The plunger 160 is provided with a mounting hole 161 perpendicular to its axis. A corresponding hole 152 is provided on the top of the ball head 150. The lower end of the pull rod 200 passes through the corresponding hole 152 and is connected to the mounting hole 161 on the plunger 160.

[0028] The present invention installs a plunger 160 in a through hole 151 horizontally arranged in the center of the ball head 150, and the plunger 160 is connected to the pull rod 200. This not only overcomes the problem of stress concentration and easy breakage of traditional ball pull rods during heat treatment, but also solves the problem that high-hardness ball heads cannot be processed with threads, as well as the problem that the ball head of the existing split ball pull rod has a small force-bearing surface and insufficient rigidity.

[0029] In this embodiment, the ball head 150 can be made of high-hardness metal material or ceramic material to improve the wear resistance of the ball head, and the pull rod 200 can be made of tempered metal material to improve the flexibility of the connecting part.

[0030] In this embodiment, see Figure 2 The ball shoe assembly includes a lower ball shoe 110, a sleeve 120, and an upper ball shoe 130, which are connected in sequence from bottom to top. The ball head 150 is movably mounted in the spherical space formed between the upper ball shoe 130 and the lower ball shoe 110. The avoidance hole 131 is provided in the upper ball shoe 130. The threaded end of the first screw 140 passes through the screw holes in the upper ball shoe 130 and the sleeve 120, and then is screwed and fixed to the lower ball shoe 110. The above structure facilitates the processing and installation of the ball shoe assembly.

[0031] In one solution, the mounting hole 161 is provided with an internal thread, and the lower end of the pull rod 200 is provided with a first external thread 210 , and the lower end of the pull rod 200 is screwed and fixed to the mounting hole 161 by threaded engagement.

[0032] In another embodiment, a limiting hole 162 is axially provided on the plunger 160 , and the limiting hole 162 passes through the pull rod 200 , and a cylindrical pin 180 is installed in the limiting hole 162 .

[0033] In the third embodiment, mounting hole 161 is internally threaded, and the lower end of tie rod 200 is provided with a first external thread 210, which is threadedly engaged and fixed to mounting hole 161. Furthermore, a limiting hole 162 is axially provided on plunger 160, extending through tie rod 200. A cylindrical pin 180 is installed within limiting hole 162, providing a more stable and reliable connection.

[0034] Furthermore, the plunger 160 is provided with set screws 190 at both ends of the limiting hole 162, and the two ends of the cylindrical pin 180 abut against the two set screws 190 to prevent the cylindrical pin 180 from sliding out of the limiting hole 162. It should be noted that the two ends of the cylindrical pin 180 extend into the plunger 160 respectively.

[0035] See also Figure 2 The lower ball bushing 110 is connected and fixed to the cutter shaft 400 by connecting screws 170.

[0036] Example 2: In traditional solutions, the tie rod 200 and the rocker 300 are adjusted using threads. Locking is achieved by cutting the threaded portion of the rocker 300, then tightening the two halves with screws, clamping the screw at the upper end of the tie rod 200. This structure poses a risk of deformation after the threads are cut, and uneven force is applied to the threads at different locations during locking. This can cause the tie rod 200 to lose its coaxiality with the centerline of the rocker 300 after tightening, causing the main drive force to deviate from the center of the cutter shaft 400, thus affecting the transmission efficiency of the gear shaping machine's main drive.

[0037] Therefore, in this embodiment, see Figure 3 The upper end of the pull rod 200 is connected to the rocker arm 300, and the lower end of the rocker arm 300 is provided with an insertion hole 310. The upper end of the pull rod 200 is inserted into the insertion hole 310, and an annular groove 320 is provided at the bottom of the rocker arm 300 with the insertion hole 310 as the center. The outer conical sleeve 340 is installed in the annular groove 320 and is tightened by a flange 350 installed at the bottom of the rocker arm 300. An inner conical sleeve 330 is installed inside the outer conical sleeve 340, and the outer wall of the inner conical sleeve 330 is matched with the inner wall of the outer conical sleeve 340 through a conical surface. A fracture is provided on the inner conical sleeve 330, and the threaded end of the second screw 341 passes through the hole of the outer conical sleeve 340 and is threadedly connected to the inner conical sleeve 330. A third screw 342 is also screwed on the outer conical sleeve 340, and the threaded end face of the third screw 342 contacts the lower end face of the inner conical sleeve 330; the pull rod 200 passes through the inner conical sleeve 330.

[0038] The rocker arm 300 and the pull rod 200 are locked by the tapered sleeve structure at the lower end of the rocker arm. This can avoid grooving the threaded part of the rocker arm, ensuring the integrity of the thread. At the same time, it can also be processed to ensure that the tapered sleeve mounting hole at the lower end of the rocker arm is coaxial with the threaded hole, which can improve the coaxial accuracy of the pull rod 200 and the rocker arm 300 after adjustment and locking.

[0039] The flange 350 is mounted on the lower end of the rocker arm 300 by means of the fourth screw 351. The upper side of the flange 350 abuts against the lower end face of the outer cone sleeve 340 to fix the outer cone sleeve 340. The inner cone sleeve 330 is mounted inside the outer cone sleeve 340, and the outer wall of the inner cone sleeve 330 and the inner wall of the outer cone sleeve 340 are matched through the conical surface. By tightening the second screw 341, the inner cone sleeve 330 is pulled down. Since the inner cone sleeve 330 is provided with a fracture, the inner cone sleeve 330 is deformed inwards, thereby holding the pull rod 200 tightly. When adjustment is required, loosen the second screw 341 and refer to Figure 1 , screw on the third screw 342, push the inner cone sleeve 330 upward through the third screw 342, and thus loosen the inner cone sleeve 330.

[0040] Combine Figure 3 The inner hole of the outer cone sleeve 340 is a cone-shaped hole that is larger at the top and smaller at the bottom, and the outer wall of the inner cone sleeve 330 is a cone-shaped structure that is larger at the top and smaller at the bottom.

[0041] Furthermore, the upper end of the pull rod 200 is provided with a second external thread 220, and the upper end of the penetration hole 310 is provided with an internal thread. The upper end of the pull rod 200 is screwed to the penetration hole 310 to improve the stability of the connection between the pull rod 200 and the rocker arm 300.

[0042] Further, in Figure 3 In the figure, a through window 360 is provided at the upper end of the penetration hole 310, and the upper end of the pull rod 200 extends into the window 360. Through the above structure, the processing difficulty of the internal thread at the upper end of the penetration hole 310 is reduced, and more adjustment space is provided for the pull rod 200.

[0043] See also Figure 1 In order to facilitate twisting the rod 200 during adjustment, a twisting portion 240 is provided on the outer wall of the rod 200 between the ball joint unit 100 and the swing arm 300. In this embodiment, the twisting portion 240 is a polyhedron structure, such as a tetrahedron or a hexahedron.

[0044] Example 3: Based on Example 2, see Figure 3 The center of the tie rod 200 is provided with an oil hole 230 extending therethrough. The top of the penetration hole 310 of the swing arm 300 is provided with an oil guide hole 370 corresponding to the oil hole 230. The oil guide hole 370 extends to the outer wall of the swing arm 300. An oil guide pipe 380 is installed at one end of the oil guide hole 370 located within the penetration hole 310 and slides into the oil hole 230 of the tie rod 200. With this structure, oil can be injected into the oil hole 230 through the oil guide hole 370, thereby lubricating the interior of the ball joint unit 100.

[0045] See also Figure 4 The oil guide tube 380 is screwed and fixed to the oil guide hole 370, and the lower end of the oil guide tube 380 is slidably inserted into the oil hole 230 of the pull rod 200, so that after the height position of the pull rod 200 is adjusted, the ball joint unit 100 can also be lubricated with oil.

[0046] During installation, the oil guide hole 370 is provided with an oil pipe joint 371 outside the swing arm 300. In addition, the window 360 is also convenient for installing and tightening the oil pipe joint 371.

[0047] Example 4: Based on Example 3, see Figure 4 The upper end of the pull rod 200 is provided with a sink, in which a sealing sleeve 390 is installed. The inner circumference of the sealing sleeve 390 is provided with a sealing groove, in which a sealing ring 392 is installed. The lower end of the oil guide pipe 380 passes through the sealing ring 392. This structure seals the oil guide pipe 380 and prevents leakage between the oil guide pipe 380 and the oil hole 230.

[0048] In this embodiment, the sealing sleeve 390 is mounted on the top of the pull rod 200 by a fifth screw 391 .

[0049] Further, see Figure 3 The lower end of the pull rod 200 is spaced a distance from the through hole 151, and the plunger 160 is provided with a notch 153 on the outer wall of the lower end of the pull rod 200. Through the above structure, the lubricating oil in the oil hole 230 can enter the gap between the ball head 150 and the ball shoe assembly.

[0050] Furthermore, a deposition hole 111 is provided at the bottom of the lower ball shoe 110 for depositing lubricating oil to ensure lubrication of the bottom of the ball head 150 and also for depositing wear powder.

[0051] Example 5: Based on the embodiment 1 or embodiment 2 or embodiment 4 or embodiment 4, a gear shaping machine adopts the gear shaping machine ball-pull rod connection structure.

[0052] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Any modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A ball-pull rod connection structure for a gear shaping machine, comprising a ball joint unit (100) and a pull rod (200), wherein the ball joint unit (100) comprises a ball shoe assembly and a ball head (150) movably mounted in the inner space of the ball shoe assembly, a relief hole (131) being provided on the top of the ball shoe assembly, and the pull rod (200) passing through the relief hole (131) and then connected to the ball head (150), characterized in that: The ball head (150) is provided with a through hole (151), a plunger (160) is installed in the through hole (151), a mounting hole (161) perpendicular to the axis of the plunger (160) is provided on the plunger (160), a corresponding hole (152) is provided on the top of the ball head (150), and the lower end of the pull rod (200) passes through the corresponding hole (152) and is connected to the mounting hole (161) on the plunger (160).

2. The ball-pull rod connection structure of a gear shaping machine according to claim 1, characterized in that: The ball bushing assembly comprises a lower ball bushing (110), a sleeve body (120) and an upper ball bushing (130) connected in sequence from bottom to top, a ball head (150) is movably installed in a spherical space formed between the upper ball bushing (130) and the lower ball bushing (110), an avoidance hole (131) is provided on the upper ball bushing (130), and a threaded end of a first screw (140) passes through screw holes on the upper ball bushing (130) and the sleeve body (120) and is then screwed and fixed to the lower ball bushing (110).

3. The ball-pull rod connection structure of a gear shaping machine according to claim 1, characterized in that: The mounting hole (161) is provided with an internal thread, and the lower end of the pull rod (200) is provided with a first external thread (210). The lower end of the pull rod (200) is screwed and fixed to the mounting hole (161) by threaded engagement.

4. A ball-and-tie rod connection structure for a gear shaping machine according to claim 1 or 3, characterized in that: A limiting hole (162) is axially provided on the plunger (160), and the limiting hole (162) passes through the pull rod (200), and a cylindrical pin (180) is installed in the limiting hole (162); the plunger (160) is respectively installed with fixing screws (190) at both ends of the limiting hole (162), and the two ends of the cylindrical pin (180) are respectively in contact with the two fixing screws (190).

5. The ball-pull rod connection structure of a gear shaping machine according to claim 1, characterized in that: The upper end of the pull rod (200) is connected to the rocker (300); the lower end of the rocker (300) is provided with a penetration hole (310), the upper end of the pull rod (200) is inserted into the penetration hole (310), the bottom of the rocker (300) is provided with an annular groove (320) with the penetration hole (310) as the center, the outer conical sleeve (340) is installed in the annular groove (320), and is pressed by a flange (350) installed at the bottom of the rocker (300), and an inner conical sleeve (340) is installed inside the outer conical sleeve (340). 30), the outer wall of the inner conical sleeve (330) and the inner wall of the outer conical sleeve (340) are matched through a conical surface, and a fracture is provided on the inner conical sleeve (330), and the threaded end of the second screw (341) passes through the hole of the outer conical sleeve (340) and is connected with the inner conical sleeve (330) through thread matching, and the outer conical sleeve (340) is also screwed and installed with a third screw (342), and the threaded end face of the third screw (342) contacts the lower end face of the inner conical sleeve (330); the pull rod (200) passes through the inner conical sleeve (330).

6. The ball-pull rod connection structure of a gear shaping machine according to claim 5, characterized in that: The upper end of the pull rod (200) is provided with a second external thread (220), the upper end of the penetration hole (310) is provided with an internal thread, and the upper end of the pull rod (200) is screwed to the penetration hole (310).

7. A ball-and-tie rod connection structure for a gear shaping machine according to claim 5 or 6, characterized in that: The center of the pull rod (200) is provided with an oil hole (230) extending therethrough, and the top of the penetration hole (310) of the rocker arm (300) is provided with an oil guide hole (370) corresponding to the oil hole (230), the oil guide hole (370) extends to the outer wall of the rocker arm (300), and an oil guide pipe (380) is installed at one end of the oil guide hole (370) located in the penetration hole (310), and the oil guide pipe (380) slides into the oil hole (230) of the pull rod (200).

8. The ball-and-tie rod connection structure of a gear shaping machine according to claim 7, characterized in that: The upper end of the pull rod (200) is provided with a sinking platform, a sealing sleeve (390) is installed in the sinking platform, the inner circumference of the sealing sleeve (390) is provided with a sealing groove, a sealing ring (392) is installed in the sealing groove, and the lower end of the oil guide pipe (380) passes through the sealing ring (392).

9. The ball-and-tie rod connection structure of a gear shaping machine according to claim 7, characterized in that: The lower end of the pull rod (200) is spaced a distance from the through hole (151), and the plunger (160) is provided with a notch (153) on the outer wall located on one side of the lower end of the pull rod (200).

10. A gear shaping machine tool, characterized in that: A gear shaping machine ball pull rod connection structure according to any one of claims 1 to 9 is adopted.

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