Differential main reduction gear bolt tightening tool

Abstract

The utility model discloses a differential main reduction gear bolt tightening frock relates to the field of automobile technology. This differential main reduction gear bolt tightening frock includes two clamping assemblies that are symmetrically arranged at the both sides of differential assembly. Differential assembly includes gear shaft and the planetary gear that is connected with it. Every clamping assembly includes drive element and clamping rod, and one end of clamping rod is connected the output of drive element, and the other end is equipped with the arc slot matched with the outer circumferential surface of gear shaft, and the slot edge is equipped with the tooth structure. When two clamping assemblies act, and the arc slot holds tightly the outer circumferential surface of gear shaft, and the tooth structure on both sides is engaged with each other, and forms integrated rigid connection. This design has discarded the traditional mode of relying on shell blank surface positioning, avoided the positioning loose problem caused by the big cooperation gap, through directly clamping gear shaft and realizing end tooth shape engagement, has improved clamping rigidity and torsional stiffness significantly.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and more specifically, to a tooling for tightening the differential main reduction gear bolt. Background Technology

[0002] During the assembly process where the differential main reduction gear is connected to the housing by high-strength bolts, a high torque (typically greater than 90 N·m) must be applied using a tightening shaft to ensure reliable bolt tightening. Because a reverse torque is generated during tightening, causing the differential assembly to tend to rotate around its central axis, external tooling must be provided to provide counterforce support, balancing the torque and ensuring that the bolts can be tightened accurately and stably to the target torque value.

[0003] Currently, common reaction support fixtures often utilize the cast blank surfaces on both sides of the differential housing as positioning references. However, the inventors discovered through research that these blank surfaces, being cast surfaces, suffer from irregular shapes and low dimensional accuracy. To avoid interference between the fixture and the blank surfaces, a large clearance must be reserved during assembly, resulting in insufficient positioning rigidity. During high-torque tightening, the differential assembly is prone to significant wobbling, affecting positioning stability and tightening accuracy. Utility Model Content

[0004] The purpose of this utility model is to provide a differential main reduction gear bolt tightening fixture, which can achieve high rigidity positioning, effectively prevent rotation and vibration during the tightening process, and significantly improve positioning stability and tightening accuracy.

[0005] The embodiments of this utility model can be implemented as follows: In the first aspect, this utility model provides a differential main reduction gear bolt tightening fixture, including two clamping components, which are used to be disposed on opposite sides of the differential assembly. The differential assembly includes a gear shaft and a planetary gear connected to the gear shaft. Each clamping assembly includes a drive element and a clamping rod. One end of the clamping rod is connected to the output end of the drive element, and the other end is provided with an arc-shaped groove for engaging with the outer peripheral surface of the gear shaft. The edge of the arc-shaped groove is provided with a toothed structure. When the two arc-shaped grooves together clamp the outer peripheral surface of the gear shaft, the two toothed structures mesh with each other.

[0006] In an optional embodiment, each clamping assembly further includes a base having a guide hole that slides with the clamping rod.

[0007] In an optional implementation, the clamping rod is clearance-fitted with the guide hole.

[0008] In an optional embodiment, the differential main reduction gear bolt tightening fixture also includes a worktable, with a base disposed on the worktable.

[0009] In an alternative implementation, the base is welded or bolted to the workbench.

[0010] In an optional embodiment, toothed structures are symmetrically provided at the groove edges on both the upper and lower sides of the arc-shaped groove.

[0011] In an optional implementation, the tooth structure is a sawtooth or trapezoidal tooth.

[0012] In an optional embodiment, the clamping rod is made of chrome steel or bearing steel.

[0013] In an alternative embodiment, with the two arcuate grooves together gripping the outer circumferential surface of the gear shaft, the clamping rod abuts against the end face of the adjacent planetary gear.

[0014] In an optional implementation, the driving element is a pneumatic cylinder or a hydraulic cylinder.

[0015] The beneficial effects of the differential main reduction gear bolt tightening fixture provided in this embodiment of the invention include: This utility model discloses a differential main reduction gear bolt tightening fixture, including two clamping assemblies symmetrically arranged on both sides of the differential assembly. The differential assembly includes a gear shaft and planetary gears connected thereto. Each clamping assembly includes a drive element and a clamping rod. One end of the clamping rod is connected to the output end of the drive element, and the other end has an arc-shaped groove that matches the outer circumferential surface of the gear shaft, with toothed structures on the groove edge. When the two clamping assemblies move, the arc-shaped groove grips the outer circumference of the gear shaft, and the toothed structures on both sides mesh with each other, forming an integrated rigid connection. This design abandons the traditional method of relying on the housing blank surface for positioning, avoiding the positioning loosening problem caused by large fitting clearances. By directly clamping the gear shaft and achieving end tooth meshing, the clamping rigidity and torsional resistance are significantly improved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the differential main reduction gear bolt tightening fixture provided in this embodiment. Figure 1 ; Figure 2 A schematic diagram of the differential main reduction gear bolt tightening fixture provided in this embodiment. Figure 2 ; Figure 3This is a partially enlarged structural diagram of the differential main reduction gear bolt tightening fixture provided in this embodiment.

[0018] Icons: 10-Differential main reduction gear bolt tightening fixture; 30-Differential assembly; 31-Gear shaft; 33-Planetary gear; 100-Clamping assembly; 110-Drive element; 130-Clamping rod; 131-Tooth structure; 150-Base. Detailed Implementation

[0019] In related technologies, reaction force support fixtures often rely on the irregular cast blank surfaces on both sides of the differential housing for positioning. Due to the large fit clearance, the rigidity is insufficient, which can easily cause component shaking when tightened with high torque, affecting accuracy and reliability.

[0020] To address the aforementioned issues, this utility model provides a differential main reduction gear bolt tightening fixture, which achieves high-rigidity positioning, effectively prevents rotation and vibration during the tightening process, and significantly improves positioning stability and tightening accuracy.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The following describes in detail the overall structure, working principle, and technical effects of the differential main reduction gear bolt tightening fixture provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0028] Please see Figure 1 and Figure 2 This utility model provides a differential main reduction gear bolt tightening fixture 10, which is applied in the field of automotive technology. It can achieve high rigidity positioning, effectively prevent rotation and vibration during the tightening process, and significantly improve positioning stability and tightening accuracy.

[0029] Specifically, the differential main reduction gear bolt tightening fixture 10 includes two clamping assemblies 100, which are positioned on opposite sides of the differential assembly 30. The differential assembly 30 includes a gear shaft 31 and a planetary gear 33 connected to the gear shaft 31.

[0030] Each clamping assembly 100 includes a drive element 110 and a clamping rod 130. One end of the clamping rod 130 is connected to the output end of the drive element 110, and the other end is provided with an arc-shaped groove for cooperating with the outer peripheral surface of the gear shaft 31. The edge of the arc-shaped groove is provided with a toothed structure 131.

[0031] With the two arc-shaped grooves clamping the outer circumference of the gear shaft 31, the two tooth-like structures 131 mesh with each other, forming an integral rigid connection structure. When the main reduction gear bolt is tightened, the applied torque will cause the main reduction gear to drive the entire differential assembly 30 to rotate around the central axis. At this time, the rotational reaction force is transmitted to the integrated clamping structure, which effectively resists the torsional torque generated during the tightening process, thereby achieving stable and reliable reaction force support and ensuring the accuracy and safety of the tightening operation.

[0032] Based on the above, this utility model provides a differential main reduction gear bolt tightening fixture 10. It directly clamps the outer circumferential surface of the gear shaft 31 using two clamping components 100. The end of the clamping rod 130 has an arc-shaped groove with a toothed structure 131. When closed, the toothed structures 131 on both sides mesh with each other, forming a stable and reliable anti-torsional connection. This design eliminates the reliance on the rough surface of the housing blank, achieves high-rigidity positioning, effectively suppresses rotation and vibration during tightening, and significantly improves positioning stability and bolt tightening accuracy.

[0033] In an optional embodiment, when the two arc-shaped grooves together grip the outer circumferential surface of the gear shaft 31, the clamping rod 130 abuts against the end face of the adjacent planetary gear 33 to form an axial limiting support, which can effectively restrain the axial movement and slight sway of the differential assembly 30 during the tightening process and improve the overall positioning rigidity.

[0034] It should be noted that if there is a gap between the clamping rod 130 and the end face of the adjacent planetary gear 33, the gap should be controlled within the range of 0 to 0.8 mm to ensure smooth assembly and avoid interference during the clamping process. At the same time, during the tightening operation, the clamping rod 130 can contact the end face of the planetary gear 33 in time and form an effective abutment, thereby eliminating the gap and achieving axial constraint.

[0035] Please see Figure 3 The upper and lower edges of the arc-shaped groove are symmetrically provided with toothed structures 131. It is easy to understand that by symmetrically providing toothed structures 131 on the upper and lower edges of the arc-shaped groove, when the two clamping components 100 jointly clamp the outer circumferential surface of the gear shaft 31, the two pairs of toothed structures 131 can mesh simultaneously, thereby forming a more stable integrated rigid structure.

[0036] Optionally, the tooth structure 131 is a sawtooth or trapezoidal tooth to enhance meshing strength and shear resistance, thereby improving the reliability and stability of clamping.

[0037] Considering that chromium steel and bearing steel have high strength, high hardness, and excellent wear resistance and fatigue resistance, and can effectively withstand the high loads and local stress concentrations repeatedly applied during the tightening process, the clamping rod 130 is made of chromium steel or bearing steel.

[0038] Furthermore, the drive element 110 is a pneumatic cylinder or a hydraulic cylinder. It is understood that pneumatic cylinders and hydraulic cylinders have advantages such as fast response speed, large output force, high control precision and good working stability, which can provide reliable and repeatable driving force for the clamping rod 130, ensuring fast, stable and uniform clamping and releasing operations on the gear shaft 31.

[0039] In an optional embodiment, each clamping assembly 100 further includes a base 150, which has a guide hole for slidingly engaging with the clamping rod 130. The clamping rod 130 passes through the guide hole and can slide axially under the drive of the driving element 110.

[0040] Understandably, the guide hole provides reliable guidance and support for the movement of the clamping rod 130, ensuring that it moves smoothly and steadily along the predetermined trajectory during clamping or releasing, effectively avoiding phenomena such as skewing or jamming caused by uneven force or assembly deviation.

[0041] Furthermore, the clamping rod 130 is fitted with the guide hole with a clearance, thereby ensuring sufficient structural stability and load-bearing capacity while maintaining flexibility of movement.

[0042] Furthermore, the differential main reduction gear bolt tightening fixture 10 also includes a worktable (not shown), with a base 150 set on the worktable for supporting and fixing the entire clamping assembly 100.

[0043] Based on the above structure, the reaction force generated during the clamping process can be transmitted sequentially through the clamping rod 130 to the base 150, and then further transmitted from the base 150 to the worktable. Since the worktable has sufficient mass and rigidity, it can effectively resist the reverse torque generated during bolt tightening, thereby ensuring the stability of the clamping process and the reliability and accuracy of the tightening process.

[0044] Optionally, the base 150 can be rigidly connected to the worktable by welding or bolting to enhance the overall structural stability and the reliability of torque transmission. Welding provides higher structural rigidity and is suitable for fixed workstations, while bolting facilitates installation, disassembly, and maintenance, adapting to the needs of different production scenarios and allowing for flexible selection based on actual applications.

[0045] The working principle of the differential main reduction gear bolt tightening fixture 10 provided by this utility model is as follows: The driving element 110 drives the corresponding clamping rod 130 to move, so that the arc-shaped grooves at the ends of the two clamping rods 130 jointly hug the outer circumferential surface of the gear shaft 31, while the tooth-like structures 131 at the edges of the arc-shaped grooves on both sides mesh with each other, thereby forming a clamping structure with strong integrity and high connection rigidity.

[0046] When tightening the main reduction gear bolts, the applied torque will cause the main reduction gear to drive the entire differential assembly 30 to rotate around its axis.

[0047] At this time, the rotational reaction force is transmitted to the clamping rod 130 through the end face of the gear shaft 31 and the planetary gear 33, and then the clamping rod 130 transmits the force to the base 150, and finally the base 150 transmits the reaction force to the worktable.

[0048] Because the worktable has sufficient mass and structural rigidity, it can effectively resist the reverse torque generated during the tightening process, thereby ensuring the stability of the tooling clamping and guaranteeing the reliability and accuracy of the bolt tightening process.

[0049] In summary, this utility model discloses a differential main reduction gear bolt tightening fixture 10, including two clamping assemblies 100 symmetrically arranged on both sides of a differential assembly 30. The differential assembly 30 includes a gear shaft 31 and a planetary gear 33 connected thereto. Each clamping assembly 100 includes a drive element 110 and a clamping rod 130. One end of the clamping rod 130 is connected to the output end of the drive element 110, and the other end is provided with an arc-shaped groove that matches the outer circumferential surface of the gear shaft 31. The groove edge is provided with toothed structures 131. When the two clamping assemblies 100 move, the arc-shaped groove clamps the outer circumference of the gear shaft 31, and the toothed structures 131 on both sides mesh with each other to form an integrated rigid connection. This design abandons the traditional method of relying on the housing blank surface for positioning, avoiding the problem of positioning loosening caused by large fitting clearance. By directly clamping the gear shaft 31 and achieving end tooth meshing, the clamping rigidity and torsional resistance are significantly improved.

[0050] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A fixture for tightening the bolts of the differential main reduction gear, characterized in that, It includes two clamping assemblies (100) for being positioned on opposite sides of a differential assembly (30), the differential assembly (30) including a gear shaft (31) and a planetary gear (33) connected to the gear shaft (31). Each clamping assembly (100) includes a drive element (110) and a clamping rod (130). One end of the clamping rod (130) is connected to the output end of the drive element (110), and the other end is provided with an arc-shaped groove for engaging with the outer peripheral surface of the gear shaft (31). The edge of the arc-shaped groove is provided with a toothed structure (131). When the two arc-shaped grooves together clamp the outer peripheral surface of the gear shaft (31), the two toothed structures (131) mesh with each other.

2. The differential main reduction gear bolt tightening fixture according to claim 1, characterized in that, Each of the clamping assemblies (100) also includes a base (150) having a guide hole that slides with the clamping rod (130).

3. The differential main reduction gear bolt tightening fixture according to claim 2, characterized in that, The clamping rod (130) is clearance-fitted with the guide hole.

4. The differential main reduction gear bolt tightening fixture according to claim 2, characterized in that, The differential main reduction gear bolt tightening fixture (10) also includes a workbench, and the base (150) is disposed on the workbench.

5. The differential main reduction gear bolt tightening fixture according to claim 4, characterized in that, The base (150) is welded or bolted to the workbench.

6. The differential main reduction gear bolt tightening fixture according to claim 1, characterized in that, The toothed structure (131) is symmetrically provided at the groove edges on both the upper and lower sides of the arc-shaped groove.

7. The differential main reduction gear bolt tightening fixture according to claim 6, characterized in that, The tooth-like structure (131) is a sawtooth or trapezoidal tooth.

8. The differential main reduction gear bolt tightening fixture according to claim 1, characterized in that, The clamping rod (130) is made of chromium steel or bearing steel.

9. The differential main reduction gear bolt tightening fixture according to claim 1, characterized in that, With the two arcuate grooves together gripping the outer circumferential surface of the gear shaft (31), the clamping rod (130) abuts against the end face of the adjacent planetary gear (33).

10. The differential main reduction gear bolt tightening fixture according to any one of claims 1 to 9, characterized in that, The driving element (110) is a cylinder or a hydraulic cylinder.

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