Automobile gear cutting device

Abstract

The present invention discloses an automobile gear cutting device, which relates to the technical field of gear processing, including a machine platform, and also includes a hydraulic telescopic rod, which is fixed to the top of the machine platform, a pressing mechanism is installed at the bottom of the hydraulic telescopic rod, and a turntable, which is rotatably installed on the table surface of the machine platform, and a placement plate is fixedly connected to the top of the turntable, a groove is opened in the center of the placement plate, and tightening members are symmetrically and elastically installed in the groove, the bottom of the pressing mechanism is in abutment with each tightening member, and a limiting tooth ring is movably embedded in the bottom of the pressing mechanism, and the limiting tooth ring is engaged with the tightening member. The present invention drives the pressing mechanism to press the gear on the placement platform by the hydraulic telescopic rod. During the downward pressing process, the pressing mechanism first pushes open each tightening member in the gear hole to tighten and position the gear. Subsequently, as the pressing mechanism continues to press downward, the tightening member not only has a tightening function, but also further stabilizes the gear through the engagement with the limiting tooth ring.

Description

Technical Field

[0001] The invention relates to the technical field of gear processing, in particular to an automobile gear cutting device. Background Art

[0002] Gears are important components in the automobile transmission system. Their quality and precision directly affect the performance and life of the automobile. Therefore, gear cutting plays a vital role in automobile manufacturing. Through precise cutting, it can ensure that the key parameters of the gear, such as tooth shape, tooth pitch, tooth height, etc., meet the design requirements, thereby ensuring the stability and reliability of automobile transmission.

[0003] The patent publication number of the existing patent application is: CN218080793U, and the publication date is December 20, 2022. The name of the patent is "A kind of automobile gear hobbing cutting device with good cooling effect". The patent includes a processing table, a protective outer body, which is arranged above the processing table, and the processing table and the protective outer body are fixedly connected by bolts, and a slide rail is fixedly installed on the upper end of the inner part of the protective outer body, and a connecting plate is arranged below the slide rail, and the slide rail and the connecting plate are slidably connected by a slider, and a connecting frame and a cooling arc plate are fixedly installed below the connecting plate, which are arranged below the connecting frame, and a fixed plate is fixedly installed above the cooling arc plate, which realizes the ability to cool the hobbing tool, thereby solving the problem that when performing gear hobbing processing, the hobbing tool will generate high temperature due to long-term cutting, causing the hobbing tool to be heated and worn, affecting the service life of the hobbing tool.

[0004] The above application has shortcomings. Since the gear is fixed by the upper pressure plate and the lower pressure plate, if the position of the gear is offset before the upper pressure plate presses the gear, it cannot be processed normally. Moreover, when the lower pressure plate rotates with the gear, if the rotation speed of the upper pressure plate and the lower pressure plate is not synchronized, the stability of the gear will also deteriorate. Summary of the invention

[0005] The purpose of the present invention is to provide an automobile gear cutting device to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A car gear cutting device comprises a machine platform and a hydraulic telescopic rod fixed on the top of the machine platform, a pressing mechanism is installed at the bottom of the hydraulic telescopic rod, and a turntable is rotatably installed on the table surface of the machine platform, and a placement plate is fixedly connected to the top of the turntable, a groove is opened at the center of the placement plate, and tightening pieces are symmetrically and elastically installed in the groove, the bottom of the pressing mechanism is in abutment with each tightening piece, and a limiting tooth ring is movably embedded in the bottom of the pressing mechanism, and the limiting tooth ring is clamped and cooperated with the tightening piece, and during the downward pressing stroke of the pressing mechanism, the tightening piece in the gear hole is first pushed open, and then the limiting tooth ring is driven to clamp the tightening piece against the inner wall of the gear hole.

[0008] Preferably, the pressing mechanism includes a sleeve rotatably connected to the rod head of the hydraulic telescopic rod, a pressure plate is fixedly connected to the bottom of the sleeve, an insertion rod passing through the pressure plate is elastically inserted in the sleeve, and a conical abutment is fixedly connected to the bottom of the insertion rod below the pressure plate, and the conical abutment is obliquely abutted against each tightening member.

[0009] Preferably, the tightening member includes a wedge-shaped clamp block slidably mounted on the bottom of the inner wall of the groove, a slider is fixedly connected to the bottom of the wedge-shaped clamp block, a slide groove matching the slider is horizontally opened in the groove, a top spring is fixedly connected between the slider and the inner wall of the slide groove, and a V-shaped opening is provided at the abutment between the two wedge-shaped clamp blocks for inserting a conical abutment.

[0010] Preferably, an air storage bin is installed on the top of the inner wall of the sleeve, a piston plate is installed on the top of the insertion rod in the air storage bin, an air storage cavity with a bottom opening is provided in the pressure plate, the air storage bin and the air storage cavity are connected by an air pipe, and a piston ring is movably nested in the air storage cavity, and the limiting gear ring is fixed to the bottom surface of the piston ring.

[0011] Preferably, a snap-fitting tooth is fixedly connected to the top of the wedge-shaped clamping block, and the snap-fitting tooth matches the tooth groove on the limiting tooth ring.

[0012] Preferably, a bidirectional lead screw is installed at the bottom of the machine platform, and a positioning frame and a gear hobbing tool holder are slidably installed on both sides of the table top of the machine platform. A positioning rod is symmetrically fixedly connected to one side of the positioning frame, and holes for inserting the positioning rod are opened on both sides of the gear hobbing tool holder.

[0013] Preferably, a connecting ring is rotatably mounted on the top surface of the pressure plate, a cross bar is fixedly connected to one side of the connecting ring, and a guide through groove matching the cross bar is vertically opened on the positioning frame.

[0014] Preferably, a stop block is fixedly connected to one side of the cross bar, and a protective stop bar is installed on one side of the positioning frame above the cross bar. When the pressure plate presses the gear, the height of the protective stop bar is higher than the stop block.

[0015] Preferably, an adjusting screw is rotatably installed in the positioning frame, and the adjusting screw is threadably connected to one end of the protective baffle rod.

[0016] Preferably, a chip storage box is placed in the machine platform, and a chip collection box connected to the chip storage box is hung on the inner side of the gear hobbing tool holder.

[0017] The gear is then moved back and forth between the drive shaft and the gear box, and the gear is then moved back and forth between the drive shaft and the gear box, so that the gear can be moved back and forth easily, thereby preventing the gear from being in an offset position when the gear is pressed by the pressing mechanism. Subsequently, as the pressing mechanism continues to press downward, the pressing member not only has a tightening function, but also further stabilizes the gear through the clamping cooperation with the limiting gear ring. When the pressing mechanism drives the limiting gear ring to be further pressed downward, the limiting gear ring will clamp the tightening member that has been pushed to the inner wall of the gear hole from above, forming a double locking structure. This double locking mechanism greatly enhances the stability of the gear during the cutting process, so that the gear can remain fixed even under high-speed rotation and cutting force, thereby preventing the rotation speed of the placement plate and the pressure plate from being inconsistent.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0019] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of an automobile gear cutting device of the present invention;

[0022] Figure 2 A bottom view of an automobile gear cutting device according to the present invention;

[0023] Figure 3 It is a schematic diagram of the connection between a placing plate and a tightening member in an automobile gear cutting device of the present invention;

[0024] Figure 4 It is a structural schematic diagram of a tightening member in an automobile gear cutting device of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection between the positioning frame and the gear hobbing tool holder in an automobile gear cutting device of the present invention;

[0026] Figure 6 It is a structural schematic diagram of a positioning frame in an automobile gear cutting device of the present invention;

[0027] Figure 7 It is a schematic diagram of the connection between the pressing mechanism and the limiting gear ring in an automobile gear cutting device of the present invention;

[0028] Figure 8 It is a cross-sectional view of a pressing mechanism in an automobile gear cutting device of the present invention;

[0029] Fig. 9 The present invention is a schematic structural diagram of an insert rod in an automobile gear cutting device.

[0030] Description of reference numerals:

[0031] 1. Machine platform; 101. Column; 2. Hydraulic telescopic rod; 3. Pressing mechanism; 301. Sleeve; 302. Pressure plate; 303. Inserting rod; 304. Gas storage bin; 305. Piston plate; 306. Gas storage chamber; 307. Gas pipe; 308. Piston ring; 309. Conical platform; 310. Retaining ring; 311. Compression spring; 4. Turntable; 401. Placement plate; 402. Groove; 403. Slideway; 5. Tighten Parts; 501, wedge-shaped clamping block; 502, sliding block; 503, top spring; 504, snap-on teeth; 6, limit gear ring; 7, bidirectional lead screw; 701, positioning frame; 702, gear hobbing tool holder; 703, positioning rod; 704, socket; 705, connecting ring; 706, cross bar; 707, guide groove; 708, stop block; 709, protective stop rod; 710, adjusting lead screw; 8, chip storage box; 801, chip collection box. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] See also Figure 1-9An automobile gear cutting device provided by an embodiment of the present invention comprises a machine platform 1, and also comprises a hydraulic telescopic rod 2, which is fixed to the top of the machine platform 1, a pressing mechanism 3 is installed at the bottom of the hydraulic telescopic rod 2, and a turntable 4 is rotatably installed on the table surface of the machine platform 1, and a placement plate 401 is fixedly connected to the top of the turntable 4, a groove 402 is opened at the center of the placement plate 401, and tightening members 5 are symmetrically and elastically installed in the groove 402, the bottom of the pressing mechanism 3 is in abutment with each tightening member 5, and a limiting tooth ring 6 is movably embedded at the bottom of the pressing mechanism 3, and the limiting tooth ring 6 is clamped with the tightening member 5. In the downward pressing stroke of the pressing mechanism 3, the tightening member 5 in the gear hole is first pushed open, and then the limiting tooth ring 6 is driven to clamp the tightening member 5 against the inner wall of the gear hole.

[0034] Specifically, a column 101 is fixed on the machine 1, and a hydraulic telescopic rod 2 is installed on the column 101. Its telescopic movement is controlled by a hydraulic system. The turntable 4 is rotatably installed on the table of the machine 1 through a bearing, and is driven by an additional driving member to realize the rotational movement of the gear. The placement plate 401 on the top of the turntable 4 is used to place the gear to be processed. The gear to be processed is placed in the groove 402 of the placement plate 401, and the center hole of the gear is aligned with the groove 402. At this time, the tensioning member 5 automatically clamps the gear under the action of the spring force. During processing, the hydraulic system is started to make the hydraulic telescopic rod 2 drive the pressing mechanism 3 to slowly descend. First, the bottom of the pressing mechanism 3 contacts and pushes open the tensioning member 5 in the gear hole until each tensioning member 5 stops moving after pressing against the hole wall of the inner hole of the gear ring, thereby fixing the gear and preparing for the engagement of the limiting gear ring 6. As the pressing mechanism 3 continues to descend, the limiting gear ring 6 reaches the predetermined position and engages with the tensioning member 5 that has been pushed open, thereby further strengthening the gear and ensuring that when the turntable rotates, the pressure plate 302 can also rotate synchronously. At this time, the gear is firmly fixed on the placement plate 401, and then the cutting tool (such as a milling cutter, a grinding wheel or a gear hobbing cutter, etc.) is started, and the driving source is started at the same time to drive the turntable 4 to rotate, and the gear cutting process begins. During the processing, since the gear is firmly fixed, the cutting accuracy and stability are significantly improved. After the cutting is completed, the cutting tool and the rotation movement of the turntable 4 are turned off, and the hydraulic telescopic rod 2 is controlled to rise through the hydraulic system to lift the pressing mechanism 3 and the limiting gear ring 6. The tensioning member 5 will be reset and moved back in time under the action of the elastic force, so that the processed gear can be removed more conveniently and quickly, so as to proceed to the next process.

[0035] When the gear is pressed down by the pressing mechanism 3, the gear 5 is locked and the locking mechanism 3 is locked.

[0036] In a further technical solution of the present invention, the pressing mechanism 3 includes a sleeve 301 rotatably connected to the rod head of the hydraulic telescopic rod 2, a pressure plate 302 is fixedly connected to the bottom of the sleeve 301, a plug rod 303 that passes through the pressure plate 302 is elastically inserted in the sleeve 301, a retaining ring 310 is fixedly connected inside the sleeve 301, a compression spring 311 is installed between the top of the plug rod 303 and the retaining ring 310, and a conical abutment 309 is fixedly connected to the bottom of the plug rod 303 below the pressure plate 302, and the conical abutment 309 is inclined against each tightening member 5. Specifically, the interior of the sleeve 301 is a hollow structure for accommodating and guiding the movement of the plug rod 303. The compression spring 311 provides a downward force for the insertion rod 303, so that it can always extend out of the pressure plate 302 when not acted upon by external force. The conical abutment 309 at the bottom of the insertion rod 303 serves as a direct component in contact with the tensioning member 5 in the gear hole. Its initial height is lower than the pressure plate 302 to ensure that during the downward pressing process of the pressing mechanism 3, the tensioning member 5 in the gear hole can be pushed open first to ensure the stability of the clamping. After the tensioning member 5 completely presses against the wall of the gear hole, the pressure plate 302 in the pressing mechanism 3 is pressed down alone, and the height of the insertion rod 303 remains unchanged, so that the position of the gear itself will not change before the pressure plate 302 presses the gear.

[0037] In a further technical solution of the present invention, the tensioning member 5 includes a wedge-shaped clamping block 501 slidably mounted on the bottom of the inner wall of the groove 402, a slider 502 is fixedly connected to the bottom of the wedge-shaped clamping block 501, a slide groove 403 matching the slider 502 is horizontally opened in the groove 402, a top spring 503 is fixedly connected between the slider 502 and the inner wall of the slide groove 403, and a V-shaped opening is provided at the abutment of the two wedge-shaped clamping blocks 501 for inserting the conical abutment 309. The two wedge-shaped clamping blocks 501 are designed with a V-shaped opening at the abutment, and the shape and size of the opening match the conical abutment 309. Specifically, the wedge-shaped clamping block 501 is the main component structure of the tensioning member 5, and its shape The shape is designed to be wedge-shaped so that it can generate an outward tensioning force when subjected to external force. The top spring 503 is fixedly connected between the slider 502 and the inner wall of the slide groove 403, providing an inward elastic force for the wedge-shaped clamp block 501. When there is no external force, the elastic force of the top spring 503 keeps the wedge-shaped clamp block 501 in an initial position. At this time, one end of the wedge-shaped clamp block 501 maintains a certain distance from the inner wall of the groove 402 to facilitate the placement of the gear. When the gear is placed above the groove 402, as the pressing mechanism 3 is pressed downward, the wedge-shaped clamp block 501 is pressed outward by the pressure of the conical abutment 309, compressing the top spring 503 and generating a tensioning force on the gear from the center of the gear.

[0038] In a further technical solution of the present invention, an air storage bin 304 is installed on the top of the inner wall of the sleeve 301, and a piston plate 305 is installed on the top of the insertion rod 303 in the air storage bin 304. A sealed space is formed between the piston plate 305 and the inner wall of the air storage bin 304 for storing gas. A gas storage chamber 306 with a bottom opening is provided in the pressure plate 302. The gas storage bin 304 and the gas storage chamber 306 are connected by a gas transmission pipe 307, and a piston ring 308 is movably nested in the gas storage chamber 306. The limiting gear ring 6 is fixed to the bottom surface of the piston ring 308, and the piston ring 308 slides vertically in the gas storage chamber 306. Specifically, after the conical abutment 309 pushes the tightening member 5 to the extent of tightening the gear, the insertion rod 303 cannot move downward any further. At this time, the pressure plate 302 is controlled to press the gear downward by controlling the hydraulic telescopic rod 2. Due to the corresponding decrease in the height of the sleeve 301, the piston plate 305 will press the gas storage The excess gas in the bin 304 is squeezed out and transported to the gas storage chamber 306 in the pressure plate 302 through the gas pipe 307. As the gas is continuously filled, the gas pressure in the gas storage chamber 306 gradually increases, pushing the piston ring 308 to move downward. The downward movement of the piston ring 308 drives the limiting gear ring 6 to clamp the wedge-shaped clamp block 501, thereby achieving a stable clamping of the gear, avoiding the problem of asynchronous rotation of the pressure plate 302 and the turntable 4, and further ensuring the stability of the gear during the processing. When the gear needs to be released, the entire pressing mechanism 3 can be lifted by the hydraulic telescopic rod 2. Under the pressure of the compression spring 311, the insertion rod 303 is reset, and the piston plate 305 is pulled, so that the gas in the gas storage chamber 306 is gradually drawn back to the gas storage bin 304, the air pressure in the gas storage chamber 306 is reduced, and the piston ring 308 moves upward, driving the limiting gear ring 6 to disengage from the cooperation with the gear, thereby achieving rapid release of the gear.

[0039] In a further technical solution of the present invention, a snap-in tooth 504 is fixedly connected to the top of the wedge-shaped clamp block 501, and the snap-in tooth 504 matches the tooth groove on the limit gear ring 6. Specifically, when the pressing mechanism 3 is pressed down, the conical abutment 309 is first inserted into the V-shaped opening between the wedge-shaped clamp blocks 501, and pushes the wedge-shaped clamp blocks 501 away from each other. As each wedge-shaped clamp block 501 presses against the inner hole of the gear from different directions, when the sleeve 301 and the pressure plate 302 are separately lowered, the piston is pushed by the increase in the internal air pressure of the air storage chamber 306. The ring 308 descends, allowing the engaging teeth 504 on the top of the wedge-shaped clamp 501 to gradually enter the tooth groove of the limiting gear ring 6. When the limiting gear ring 6 descends, since the position of the wedge-shaped clamp 501 has not changed, the limiting gear ring 6 will be forced to rotate with the entire pressing mechanism 3 during the docking process. When the docking angle is adjusted and the predetermined clamping force is reached, the limiting gear ring 6 firmly presses the engaging teeth 504. At this time, the gear will be firmly clamped between the placement plate 401 and the pressure plate 302, and the gear will be fixed from multiple directions.

[0040] In a further technical solution of the present invention, a bidirectional lead screw 7 is installed at the bottom of the machine table 1, one end of the bidirectional lead screw 7 is connected to a servo motor, a positioning frame 701 and a gear hobbing tool holder 702 are slidably installed on both sides of the table top of the machine table 1, a positioning rod 703 is symmetrically fixedly connected to one side of the positioning frame 701, and a socket 704 for inserting the positioning rod 703 is provided on both sides of the gear hobbing tool holder 702. Specifically, the bidirectional lead screw 7 is firmly installed at the bottom of the machine table 1 through a bearing seat, and the bidirectional lead screw 7 can simultaneously drive the positioning frame 701 and the gear hobbing tool holder 702 to move in opposite or same directions. The positioning rod 703 is used to cooperate with the socket 704 on the gear hobbing tool holder 702 to achieve precise alignment of the two and prevent the gear hobbing tool holder 702 from shifting when moving toward the gear. If the gear hobbing tool holder 702 shifts, it will not be able to further contact the gear due to the obstruction of the positioning rod 703, thereby ensuring the accuracy of gear processing. A gear hobbing cutter is installed on the gear hobbing tool holder 702. By adjusting the position of the gear hobbing tool holder 702, gears of different sizes can be processed. The position of the gear hobbing tool holder 702 can be adjusted at any time by controlling the rotation of the bidirectional lead screw 7 by the servo motor, and the gear can be cut by the gear hobbing cutter.

[0041] In a further technical solution of the present invention, a connecting ring 705 is rotatably installed on the top surface of the pressure plate 302, and a cross bar 706 is fixedly connected to one side of the connecting ring 705. A guide through groove 707 matching the cross bar 706 is vertically opened on the positioning frame 701. Specifically, the connecting ring 705 and the pressure plate 302 are rotatably connected. Since the cross bar 706 on the connecting ring 705 is inserted into the guide groove on the positioning frame 701, the connecting ring 705 will not rotate with the pressure plate 302, and the connecting ring 705 will not affect the rotation of the pressure plate 302, but it can limit the front and rear position of the pressure plate 302.

[0042] In a further technical solution of the present invention, a stop block 708 is fixedly connected to one side of the cross bar 706, and a protective stop bar 709 is installed on one side of the positioning frame 701 above the cross bar 706. When the pressure plate 302 presses the gear, the height of the protective stop bar 709 is higher than the stop block 708. Specifically, when the pressure plate 302 is lifted, the height of the protective stop bar 709 is lower than the stop block 708. After the pressure plate 302 presses the gear, since the height of the protective stop bar exceeds the height of the stop block 708, the two-way screw 7 is controlled to allow the positioning frame 701 and the gear hobbing tool holder 702 to approach each other. During the processing of the gear hobbing cutter on the gear hobbing tool holder 702, the protective stop bar 709 is always blocked at the top of the stop block 708. As long as the gear is in the processing state, the pressure plate 302 cannot be lifted by itself, thereby avoiding accidental bouncing of the gear and reducing the safety hazards in the processing process.

[0043] In a further technical solution of the present invention, an adjusting screw rod 710 is rotatably installed in the positioning frame 701. The adjusting screw rod 710 is vertically arranged on one side of the positioning frame 701. The adjusting screw rod 710 is threadedly connected to one end of the protective baffle rod 709. Specifically, the adjusting screw rod 710 can realize precise adjustment of the protective baffle rod 709 threadedly connected thereto through rotational motion. The height of the protective baffle rod 709 can be adjusted to adapt to the processing of gears of different thicknesses, so that the protective baffle rod 709 can be completely fitted with the baffle block 708 on the cross bar 706.

[0044] In a further technical solution of the present invention, a chip storage box 8 is placed in the machine 1, and a chip collection box 801 connected to the chip storage box 8 is hung on the inner side of the gear hobbing cutter holder 702. Specifically, the chip collection box 801 is located directly below the gear hobbing cutter, and metal chips generated by cutting gears will directly fall into the chip collection box 801, and then be concentrated in the chip storage box 8 for storage, thereby reducing the residual waste chips on the machine 1.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automobile gear cutting device, comprising a machine platform (1), characterized in that: Also includes: A hydraulic telescopic rod (2) fixed to the top of the machine platform (1), wherein a pressing mechanism (3) is installed at the bottom of the hydraulic telescopic rod (2); A turntable (4) is rotatably mounted on the table surface of the machine table (1), and a placement plate (401) is fixedly connected to the top of the turntable (4), a groove (402) is provided at the center of the placement plate (401), and tightening members (5) are symmetrically and elastically installed in the groove (402), the bottom of the pressing mechanism (3) is in abutment with each tightening member (5), and a limiting toothed ring (6) is movably embedded in the bottom of the pressing mechanism (3), and the limiting toothed ring (6) is in a clamping engagement with the tightening member (5); The pressing mechanism (3) comprises a sleeve (301) rotatably connected to the rod head of the hydraulic telescopic rod (2); a pressure plate (302) is fixedly connected to the bottom of the sleeve (301); an insertion rod (303) penetrating the pressure plate (302) is elastically inserted in the sleeve (301); a conical abutment platform (309) is fixedly connected to the bottom of the insertion rod (303) below the pressure plate (302); the conical abutment platform (309) is inclined to abut against each of the tightening members (5); An air storage bin (304) is installed at the top of the inner wall of the sleeve (301), a piston plate (305) is installed at the top of the insertion rod (303) in the air storage bin (304), an air storage cavity (306) with a bottom opening is provided in the pressure plate (302), the air storage bin (304) and the air storage cavity (306) are connected via an air delivery pipe (307), a piston ring (308) is movably embedded in the air storage cavity (306), and the limiting gear ring (6) is fixed to the bottom surface of the piston ring (308); During the downward pressing stroke of the pressing mechanism (3), the tensioning member (5) in the gear hole is first pushed open, and then the limiting toothed ring (6) is driven to clamp the tensioning member (5) against the inner wall of the gear hole.

2. The automotive gear cutting device according to claim 1, characterized in that: The tightening member (5) comprises a wedge-shaped clamping block (501) slidably mounted on the bottom of the inner wall of the groove (402); a slider (502) is fixedly connected to the bottom of the wedge-shaped clamping block (501); a slide groove (403) matching the slide groove (502) is horizontally opened in the groove (402); a top spring (503) is fixedly connected between the slide groove (502) and the inner wall of the slide groove (403); and a V-shaped opening for inserting a conical abutment (309) is provided at the abutment between the two wedge-shaped clamping blocks (501).

3. The automotive gear cutting device according to claim 2, characterized in that: A clamping tooth (504) is fixedly connected to the top of the wedge-shaped clamping block (501), and the clamping tooth (504) matches the tooth groove on the limiting tooth ring (6).

4. The automotive gear cutting device according to claim 1, characterized in that: A bidirectional lead screw (7) is installed at the bottom of the machine platform (1), and a positioning frame (701) and a gear hobbing tool holder (702) are slidably installed on both sides of the table top of the machine platform (1), a positioning rod (703) is symmetrically fixedly connected to one side of the positioning frame (701), and sockets (704) for inserting the positioning rod (703) are provided on both sides of the gear hobbing tool holder (702).

5. The automotive gear cutting device according to claim 4, characterized in that: A connecting ring (705) is rotatably mounted on the top surface of the pressure plate (302), a cross bar (706) is fixedly connected to one side of the connecting ring (705), and a guide through groove (707) matching the cross bar (706) is vertically opened on the positioning frame (701).

6. The automotive gear cutting device according to claim 5, characterized in that: A stopper (708) is fixedly connected to one side of the cross bar (706), and a protective stopper (709) is installed on one side of the positioning frame (701) above the cross bar (706). When the pressure plate (302) presses the gear, the height of the protective stopper (709) is higher than the stopper (708).

7. The automotive gear cutting device according to claim 4, characterized in that: An adjusting screw rod (710) is rotatably mounted in the positioning frame (701), and the adjusting screw rod (710) is threadably connected to one end of the protective stop rod (709).

8. The automotive gear cutting device according to claim 4, characterized in that: A chip storage box (8) is placed inside the machine platform (1), and a chip collection box (801) connected to the chip storage box (8) is hung on the inner side of the gear hobbing tool holder (702).

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