Locking differential combined with gear cold forging forming device

Abstract

This utility model relates to the field of gear processing technology, and in particular to a locking differential combined with a gear cold forging forming device. The technical solution includes: a forging press body; a forming mold fixedly installed inside the forging press body; the forming mold includes a lower mold; a lifting assembly is movably installed at the bottom of the lower mold; a gear body is placed inside the lower mold; the lifting assembly includes a base plate, which is movably installed with the lower mold; an electric motor is embedded in the base plate; a lead screw is driven and installed at the top of the electric motor; the lead screw passes through the center of the bottom of the lower mold and is threadedly connected to the lower mold; a stripper plate is fixedly installed at the top of the lead screw inside the lower mold, and the stripper plate is located directly below the gear body. This utility model has the advantages of efficient demolding and precise positioning, solving the problem that the special arc-shaped tooth profile of the bevel gear makes it difficult to separate the gear from the mold using traditional demolding methods, thus affecting production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gear processing technology, specifically to a locking differential combined with a gear cold forging forming device. Background Technology

[0002] The locking differential engagement gear is a key component of the differential system, playing a crucial role in vehicle operation. It mainly consists of several parts, including uniquely designed bevel gears. These bevel gears occupy a central position in the entire engagement gear system, with their teeth featuring a special arc shape. This arc-shaped tooth design is not accidental; it offers numerous advantages. The arc-shaped teeth allow for smoother gear engagement, effectively reducing impact and wear. Compared to ordinary spur gears, it significantly improves transmission efficiency and reduces energy loss. When the locking differential is operating, the bevel gears in the engagement gear work closely together, achieving efficient power distribution and transmission through the precise meshing of the arc-shaped teeth, ensuring stable driving performance and handling under various road conditions.

[0003] Extensive research revealed CN220739360U, which discloses a cold forging die for a differential half-shaft gear, relating to the field of gear processing technology. This die includes an upper die and a lower die, an upper cavity in the upper die, a lower cavity in the lower die, and a flow-diverting hole in the center of the bottom of the lower cavity. All small-end tooth surfaces in the lower cavity have flow-diverting branches for axial metal flow during cold forging. All flow-diverting branches are connected to the flow-diverting hole. When the die is closed, the tooth hole height in the lower cavity is 0.1 mm smaller than the tooth height of the cold-forged blank, and the tooth thickness profile in the lower cavity closely matches the tooth thickness of the cold-forged blank. This existing device can solve the problem of incomplete metal filling and ensure the forming quality of the half-shaft gear.

[0004] However, due to the unique arc-shaped tooth profile of bevel gears, removing the gears from the mold after cold forging presents a significant challenge. This is because the special arc-shaped tooth structure makes traditional simple demolding methods ineffective in separating the gears from the mold, greatly impacting production efficiency. Based on this, we propose a locking differential combined with a gear cold forging device, aiming to solve this industry pain point and optimize the gear production process. Utility Model Content

[0005] The purpose of this invention is to provide a locking differential combined with a gear cold forging forming device, which has the advantages of efficient demolding and precise positioning. It solves the problem that the traditional demolding method is difficult to separate the gear from the mold due to the special arc tooth shape of the bevel gear, thus affecting the production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a locking differential combined with gear cold forging forming device, including a forging press body, a forming mold fixedly installed inside the forging press body, the forming mold including a lower mold, a lifting component movably installed at the bottom of the lower mold, and a gear body placed inside the lower mold; the lifting component includes a base plate, the base plate being movably installed with the lower mold, an electric motor being embedded in the base plate, a lead screw being driven and installed at the top of the electric motor, the lead screw passing through the center of the bottom of the lower mold and threadedly connected to the lower mold, and a stripper plate being fixedly installed at the top of the lead screw inside the lower mold, the stripper plate being located directly below the gear body.

[0007] Preferably, the forging press body includes a frame, a hydraulic device is fixedly installed on the top of the frame, an upper mold is fixedly installed on the piston end of the hydraulic device, and an installation frame is fixedly installed in the middle of the inner side of the frame.

[0008] In the design, a hydraulic device is fixedly installed on the top of the frame, and the upper mold is fixedly installed on the piston end of the hydraulic device. An installation frame is fixedly installed in the middle of the inner side of the frame. This provides power for the cold forging process and provides stable support for the mold. Under the drive of the hydraulic device, the upper mold can accurately perform cold forging operation on the gear blank in the lower mold, ensuring the smooth progress of the cold forging work.

[0009] Preferably, the upper mold is located directly above the lower mold, and a protrusion is provided at the center of the bottom of the upper mold, the size of which matches the size of the inner ring of the gear body.

[0010] In the design, by setting a protrusion at the bottom center of the upper die, and matching the size of the protrusion with the inner ring size of the gear body, the upper die and the gear body are precisely positioned during the cold forging process. This ensures that the pressure applied by the upper die is evenly distributed on the gear body, thereby improving the accuracy of the cold forging of the gear and making the cold-forged gear meet the design requirements.

[0011] Preferably, a support frame is welded and installed on the outside of the lower mold, and the bottom of the support frame is fixedly connected to the upper end face of the mounting frame.

[0012] In the design, a support frame is welded and installed on the outside of the lower die, and the bottom of the support frame is fixedly connected to the upper end face of the mounting frame. This ensures the stable installation of the lower die, enabling it to withstand the pressure from the upper die and other external forces during the cold forging process, maintaining stability and preventing displacement or shaking during the cold forging process. This, in turn, ensures the quality and precision of the gear cold forging.

[0013] Preferably, connecting rods are fixedly installed in a ring array on the outer side of the upper surface of the base plate, and a sleeve is slidably installed on the top of the connecting rod, with the top of the sleeve fixedly connected to the bottom of the lower mold.

[0014] In the design, connecting rods are fixedly installed in a ring array on the outer side of the upper surface of the base plate, and sleeves are slidably installed on the top of the connecting rods, with the top of the sleeves fixedly connected to the bottom of the lower mold. This achieves stable guidance of the ejector plate when the lifting assembly is working. When the lead screw drives the ejector plate to rise, the cooperation between the connecting rods and the sleeves ensures that the ejector plate rises smoothly, preventing tilting or displacement of the ejector plate during the rising process, thus improving the stability and reliability of the gear demolding process.

[0015] Preferably, the upper surface of the ejector plate contacts but is not fixedly connected to the bottom of the gear body, and the outer diameter of the ejector plate is smaller than the outer diameter of the gear body.

[0016] In this design, by having the upper surface of the ejector plate contact the bottom of the gear body but not fix it, and by making the outer diameter of the ejector plate smaller than the outer diameter of the gear body, the friction between the ejector plate and the bottom of the gear body is used to push the gear body to rotate and demold, without damaging the shape of the gear body. This design ensures that the ejector plate does not restrict the rotation of the gear body when pushing it, and the smaller outer diameter also avoids interference with the external teeth of the gear body during demolding, thus ensuring smooth demolding and the quality of the gear.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention achieves highly efficient demolding by incorporating a lifting assembly and embedding an electric motor within the base plate, which drives a lead screw. A ejector plate is fixed to the top of the lead screw. Specifically, when the electric motor operates, the lead screw rotates, causing the ejector plate to rise. The ejector plate contacts the bottom of the gear body, and friction forces the gear body to rotate along the tooth direction, gradually disengaging the gear from the lower mold. This solves the problem of traditional demolding methods failing to separate the gear from the mold due to the special arc-shaped tooth profile of bevel gears, significantly improving production efficiency.

[0019] This invention achieves precise positioning by setting a protrusion at the bottom center of the upper die that matches the size of the inner ring of the gear body. During cold forging, the protrusion of the upper die can accurately embed into the inner ring of the gear body, ensuring that the pressure applied by the upper die is evenly distributed on the gear body. This effectively improves the accuracy of cold forging of the gear, avoids affecting gear quality due to inaccurate positioning, and further improves production efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the forging press body structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the forming mold structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the forming mold of this utility model.

[0024] In the diagram: 1. Forging press body; 11. Frame; 12. Hydraulic device; 13. Upper die; 14. Mounting frame; 2. Forming die; 21. Lower die; 211. Sleeve; 212. Connecting rod; 22. Support frame; 23. Gear body; 24. Lifting assembly; 241. Base plate; 242. Electric motor; 243. Lead screw; 244. Unloading plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, one embodiment of this utility model is provided: a locking differential combined with gear cold forging forming device, including a forging press body 1, a forming mold 2 fixedly installed inside the forging press body 1, the forming mold 2 including a lower mold 21, a lifting component 24 movably installed at the bottom of the lower mold 21, and a gear body 23 placed inside the lower mold 21; the lifting component 24 includes a base plate 241, the base plate 241 is movably installed with the lower mold 21, an electric motor 242 is embedded in the base plate 241, a lead screw 243 is driven and installed at the top of the electric motor 242, the lead screw 243 passes through the bottom center of the lower mold 21 and is threadedly connected to the lower mold 21, and a stripper plate 244 is fixedly installed at the top of the lead screw 243 inside the lower mold 21, the stripper plate 244 is located directly below the gear body 23.

[0027] Specifically, by setting up a lifting assembly 24, and embedding an electric motor 242 within the base plate 241 to drive a lead screw 243, with a ejector plate 244 fixed to the top of the lead screw 243, a highly efficient demolding effect is achieved. Specifically, when the electric motor 242 operates, the lead screw 243 rotates, causing the ejector plate 244 to rise. The ejector plate 244 contacts the bottom of the gear body 23, using friction to push the gear body 23 to rotate along the tooth direction, causing the gear body 23 to gradually disengage from the lower mold 21. This solves the problem that traditional demolding methods struggle to separate the gear from the mold due to the special arc-shaped tooth profile of the bevel gear, greatly improving production efficiency.

[0028] By setting a protrusion at the bottom center of the upper die 13 that matches the inner ring size of the gear body 23, precise positioning is achieved. During the cold forging process, the protrusion of the upper die 13 can accurately embed into the inner ring of the gear body 23, ensuring that the pressure applied by the upper die 13 is evenly distributed on the gear body 23. This effectively improves the accuracy of cold forging of the gear, avoids affecting gear quality due to inaccurate positioning, and further improves production efficiency and product quality. Example 2

[0029] To ensure a stable power supply and precise die installation during cold forging, and to guarantee the smooth operation of the cold forging process, such as... Figure 1 and Figure 2 As shown, in this embodiment, the forging press body 1 includes a frame 11, a hydraulic device 12 is fixedly installed on the top of the frame 11, an upper mold 13 is fixedly installed on the piston end of the hydraulic device 12, and an installation frame 14 is fixedly installed in the middle of the inner side of the frame 11.

[0030] Specifically, by fixing a hydraulic device 12 to the top of the frame 11, and fixing an upper mold 13 to the piston end of the hydraulic device 12, and fixing an mounting bracket 14 to the middle of the inner side of the frame 11, the power supply for the cold forging process and the stable support for the mold are realized. This allows the upper mold 13 to accurately perform cold forging operations on the gear blank in the lower mold 21 under the drive of the hydraulic device 12, ensuring the smooth progress of the cold forging work.

[0031] Furthermore, the upper mold 13 is located directly above the lower mold 21, and a protrusion is provided at the center of the bottom of the upper mold 13. The size of the protrusion matches the inner ring size of the gear body 23.

[0032] Specifically, by setting a protrusion at the bottom center of the upper mold 13, and matching the size of the protrusion with the inner ring size of the gear body 23, the upper mold 13 and the gear body 23 are precisely positioned during the cold forging process, ensuring that the pressure applied by the upper mold 13 can be evenly distributed on the gear body 23, thereby improving the accuracy of the cold forging of the gear and making the cold-forged gear meet the design requirements. Example 3

[0033] To ensure stable installation of the lower mold and improve the stability of the gear demolding process, such as Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, a support frame 22 is welded and installed on the outside of the lower mold 21, and the bottom of the support frame 22 is fixedly connected to the upper end face of the mounting frame 14.

[0034] Specifically, by welding and installing a support frame 22 on the outside of the lower die 21, and fixing the bottom of the support frame 22 to the upper end face of the mounting frame 14, the lower die 21 is stably installed, so that the lower die 21 can withstand the pressure from the upper die 13 and other external forces during the cold forging process, remain stable, and avoid displacement or shaking during the cold forging process, thereby ensuring the quality and precision of gear cold forging.

[0035] Furthermore, connecting rods 212 are fixedly installed in a ring array on the outer side of the upper end face of the base plate 241, and sleeves 211 are slidably installed on the top of the connecting rods 212. The top of the sleeves 211 is fixedly connected to the bottom of the lower mold 21.

[0036] Specifically, by fixing connecting rods 212 in a circular array on the outer side of the upper surface of the base plate 241, and slidingly installing sleeves 211 on the top of the connecting rods 212, with the top of the sleeves 211 fixedly connected to the bottom of the lower mold 21, stable guidance of the ejector plate 244 is achieved when the lifting assembly 24 is working. When the lead screw 243 drives the ejector plate 244 to rise, the cooperation between the connecting rods 212 and the sleeves 211 ensures that the ejector plate 244 rises smoothly, preventing the ejector plate 244 from tilting or shifting during the rising process, thus improving the stability and reliability of the gear demolding process.

[0037] Furthermore, the upper end face of the ejector plate 244 contacts the bottom of the gear body 23 but is not fixedly connected, and the outer diameter of the ejector plate 244 is smaller than the outer diameter of the gear body 23.

[0038] Specifically, by having the upper surface of the ejector plate 244 contact the bottom of the gear body 23 but not fix it, and by having the outer diameter of the ejector plate 244 smaller than the outer diameter of the gear body 23, the friction between the ejector plate 244 and the bottom of the gear body 23 is used to push the gear body 23 to rotate and demold, without damaging the shape of the gear body 23. This design ensures that the ejector plate 244 does not restrict the rotation of the gear body 23 due to a fixed connection when pushing it, and the smaller outer diameter also avoids interference with the external teeth of the gear body 23 during demolding, ensuring smooth demolding and the quality of the gear.

[0039] After cold forging is completed, the forging press body 1 is ensured to be in a stopped state to avoid danger during operation. At this time, the gear body 23 is located inside the lower die 21.

[0040] The electric motor 242 located inside the base plate 241 is started, and the electric motor 242 begins to work, driving the lead screw 243 at the top to rotate. Since the lead screw 243 is threadedly connected to the lower mold 21 and passes through the center of the bottom of the lower mold 21, the lead screw 243 begins to move upward as it rotates.

[0041] The ejector plate 244, fixedly mounted on the top of the lead screw 243, moves upward with the lead screw 243. The ejector plate 244 is located directly below the gear body 23, and its upper surface contacts the bottom of the gear body 23. When the ejector plate 244 begins to move upward, due to the friction between the ejector plate 244 and the bottom of the gear body 23, this friction acts on the gear body 23, causing the gear body 23 to rotate along the direction of its teeth.

[0042] As the gear body 23 rotates continuously, the originally tight fit between it and the lower mold 21 gradually loosens, and the gear body 23 begins to gradually disengage from the lower mold 21. During this process, the connecting rods 212, which are fixedly installed in a ring array on the outer side of the upper end face of the base plate 241, and the sleeves 211, which are slidably installed on the top of the connecting rods 212, play a guiding and stabilizing role, ensuring that the lower mold 21 remains stable during the rise of the lead screw 243 and preventing deviation.

[0043] Continue the above process until the gear body 23 is completely ejected from the lower mold 21. At this point, the gear body 23 can be manually removed from the ejector plate 244 to complete the removal operation of the gear body 23.

[0044] After removing the gear body 23, turn off the electric motor 242, the lead screw 243 stops rotating, and the ejector plate 244 stops rising. Then, the electric motor 242 can be started in reverse to make the lead screw 243 drive the ejector plate 244 down to the initial position, preparing for the next cold forging and material removal.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A locking differential combined with gear cold forging forming device, comprising a forging press body (1), wherein a forming mold (2) is fixedly installed inside the forging press body (1), characterized in that: The forming mold (2) includes a lower mold (21), a lifting component (24) is movably installed at the bottom of the lower mold (21), and a gear body (23) is placed inside the lower mold (21). The lifting assembly (24) includes a base plate (241), which is movably installed with the lower mold (21). An electric motor (242) is embedded in the base plate (241), and a lead screw (243) is driven on the top of the electric motor (242). The lead screw (243) passes through the bottom center of the lower mold (21) and is threadedly connected to the lower mold (21). A ejector plate (244) is fixedly installed on the top of the lead screw (243) inside the lower mold (21), and the ejector plate (244) is located directly below the gear body (23).

2. The locking differential combined with gear cold forging forming device according to claim 1, characterized in that, The forging press body (1) includes a frame (11), a hydraulic device (12) is fixedly installed on the top of the frame (11), an upper mold (13) is fixedly installed on the piston end of the hydraulic device (12), and an installation frame (14) is fixedly installed in the middle of the inner side of the frame (11).

3. The locking differential combined with gear cold forging forming device according to claim 2, characterized in that, The upper mold (13) is located directly above the lower mold (21). The bottom center of the upper mold (13) has a protrusion, the size of which matches the inner ring size of the gear body (23).

4. The locking differential combined with gear cold forging forming device according to claim 1, characterized in that, A support frame (22) is welded and installed on the outside of the lower mold (21), and the bottom of the support frame (22) is fixedly connected to the upper end face of the mounting frame (14).

5. The locking differential combined with gear cold forging forming device according to claim 1, characterized in that, The outer side of the upper end face of the base plate (241) is fixedly installed with connecting rods (212) in a ring array. A sleeve (211) is slidably installed on the top of the connecting rods (212). The top of the sleeve (211) is fixedly connected to the bottom of the lower mold (21).

6. The locking differential combined with gear cold forging forming device according to claim 1, characterized in that, The upper end face of the ejector plate (244) is in contact with the bottom of the gear body (23) but not fixedly connected, and the outer diameter of the ejector plate (244) is smaller than the outer diameter of the gear body (23).

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