Limiting gear
By designing the avoidance slot on the gear, the problem of processing difficulties after the heat treatment is solved, and the more stable knives and higher workpiece surface quality are achieved, and the product yield is improved.
Patent Information
- Application Number
- CN202420621663.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During processing, existing gears have increased hardness and deformation due to heat treatment, which leads to difficulty in processing bolt holes and mating surfaces, resulting in reduced blade life and poor surface quality of the workpiece.
A limited gear is designed. There is a bolt hole in the inner circle of the gear body, and a avoidance slot is opened on the side of the bolt hole. Stable, avoid disconnected cutting.
By avoiding the design of the slot, the continuous plane of the combined surface during processing is ensured, the knife is protected, the service life of the tool is extended, the surface quality of the workpiece is improved, the cost waste is reduced, and the product yield is improved.
Smart Images
Figure CN222415845U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of differentials, in particular to a limiting gear. Background Art
[0002] The differential is located at the end of the gearbox. Gears are installed on the differential housing to receive the power of the gearbox. The gears on the differential have a large torque, so it is usually necessary to design many bolt holes on the gears to achieve the fastening requirements of the gears and the differential housing. In order to achieve effective fastening and anti-loosening of the bolts, the joint surface of the gear and the housing has a high flatness requirement.
[0003] When machining gears, the hardness increases and they deform after heat treatment. For bolt holes and mating surfaces, the bolt holes are usually rough-machined first, and then the mating surfaces at key positions and the holes are fine-machined after heat treatment. The presence of bolt holes will lead to intermittent cutting when machining the mating surfaces. The blade is easily damaged by sudden force changes, which greatly reduces the life of the blade and the surface quality of the parts is not good. In addition, the slight damage to the blade is not easy to be found by the naked eye. When the workpiece is inspected, it has already caused a waste of cost. It is necessary to improve the existing technology. For this purpose, a limit gear is designed. Utility Model Content
[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to propose a limit gear, optimize the structure, make it easier to process, and increase the product yield during production.
[0005] The limiting gear proposed according to the utility model includes a gear body, the inner ring of the gear body is provided with a bolt hole, one side of the bolt hole is provided with an avoidance groove, a differential housing is placed inside the gear body, a fastening bolt is installed between the differential housing and the gear body, and a nut is threadedly installed on the surface of the fastening bolt.
[0006] Preferably, the fastening bolt passes through the bolt hole and the differential housing.
[0007] Preferably, the inner ring side wall of the gear body is provided with a bonding surface, the outer ring side wall of the gear body is provided with tooth patterns, and the outer surface of the differential housing is in close contact with the bonding surface.
[0008] Preferably, the avoidance groove is opened at a position lower than the combining surface.
[0009] The beneficial effects of the utility model are as follows: the joint surfaces are all continuous planes except the avoidance groove, which can ensure that the blade is subjected to stable force when the turning tool cuts the joint surface, making processing easier, effectively protecting the tool, and extending the service life of the tool; at the same time, the surface quality of the workpiece is ensured, cost waste is avoided, and product yield is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a partial cross-sectional view of the assembly structure of the limit gear proposed by the utility model.
[0011] Figure 2 This is a partial cross-sectional view of the gear body structure of the limiting gear proposed in the utility model.
[0012] In the figure: 1. differential housing; 2. gear body; 21. mating surface; 22. bolt hole; 23. avoidance groove; 3. fastening bolt; 4. nut. DETAILED DESCRIPTION
[0013] Reference Figure 1-2 The limit gear comprises a gear body 2, the inner ring of the gear body 2 is provided with a bolt hole 22, one side of the bolt hole 22 is provided with an avoidance groove 23, a differential housing 1 is placed inside the gear body 2, a fastening bolt 3 is set between the differential housing 1 and the gear body 2, and a nut 4 is threadedly installed on the surface of the fastening bolt 3.
[0014] The fastening bolts 3 penetrate the bolt holes 22 and the differential case 1 .
[0015] The inner ring side wall of the gear body 2 is provided with a bonding surface 21 , the outer ring side wall of the gear body 2 is provided with tooth patterns, and the outer surface of the differential housing 1 is closely attached to the bonding surface 21 .
[0016] The avoidance groove 23 is opened at a position lower than the joint surface 21 .
[0017] When the device is used, for the bolt hole 22 and the mating surface 21, before the gear is heat treated, the hardness of the blank is relatively low, the avoidance groove 23 is processed according to the designed size, the rough processing process of the bolt hole 22 remains unchanged, and then the heat treatment is performed, and then the mating surface and the hole are finely processed after the heat treatment; because the avoidance groove 23 is lower than the pre-processed mating surface 21, the turning tool does not pass through the bolt hole 22 when processing the mating surface 21, thereby avoiding intermittent cutting, protecting the blade, and achieving a higher surface quality target of the mating surface 21.
[0018] When the limiting gear 2 is assembled with the differential case 1, the fixing connection is achieved by passing the fastening bolt 3 through the bolt hole and fitting the nut 4. The avoidance groove 23 of the limiting gear is lower than the joint surface 21, which does not affect the precise matching between the differential case and the limiting gear. The use requirements are met.
Claims
1. Limiting gear, characterized by: It includes a gear body, the inner ring of the gear body is provided with a bolt hole, one side of the bolt hole is provided with an avoidance groove, a differential housing is placed inside the gear body, a fastening bolt is set between the differential housing and the gear body, and a nut is threadedly installed on the surface of the fastening bolt.
2. The limiting gear according to claim 1, characterized in that: The fastening bolt passes through the bolt hole and the differential case.
3. The limiting gear according to claim 1, characterized in that: The inner ring side wall of the gear body is provided with a bonding surface, the outer ring side wall of the gear body is provided with tooth patterns, and the outer surface of the differential housing is closely attached to the bonding surface.
4. The limiting gear according to claim 3, characterized in that: The avoidance groove is opened at a position lower than the combining surface.