High-adaptability spiral bevel gear

Abstract

The utility model belongs to the field of bevel gears, particularly relates to a high-adaptability spiral bevel gear, and aims to solve the problems that when the specification of a transmission shaft of an existing spiral bevel gear is changed, the gear needs to be integrally replaced or an adapter flange needs to be configured, and material inventory pressure and equipment modification cost are increased. Besides, the connecting structure of the split type gear generally has the problems of tedious assembly and insufficient torsional strength, and the following scheme is provided: the connecting structure comprises a spiral bevel gear main body and a plurality of mounting blocks, the sizes of the plurality of mounting blocks are gradually reduced in a stepped manner, and mounting holes of which the diameters are gradually reduced in an arithmetic progression manner are formed in the mounting blocks; according to the spiral bevel gear assembly, full coverage of the radial size of a transmission shaft is achieved through a modular installation structure, the stepped installation block combination design is adopted, the installation holes with the diameters decreasing in an arithmetic progression mode are formed, a standard transmission shaft system with the diameter ranging from 15 mm to 45 mm is adapted, and the transmission shaft assembly is simple in structure, convenient to use and high in practicability. And the adjacent mounting blocks are mechanically interlocked through the swallow-tail-shaped inserting blocks and the rectangular holes.

Description

TECHNICAL FIELD

[0001] The utility model relates to bevel gear technical field especially relates to a high adaptability spiral bevel gear. BACKGROUND

[0002] In the field of mechanical transmission, spiral bevel gears are widely used in vehicle differentials, engineering machinery reduction mechanisms and industrial robot joint modules as key transmission components. The traditional spiral bevel gears have significant technical bottlenecks: the mounting holes are designed with a fixed single diameter, and when the specifications of the transmission shafts change, the gears need to be replaced as a whole or adapter flanges need to be configured, which increases the material inventory pressure and the cost of equipment modification. Existing adjustable gears mostly use an expanded sleeve connection scheme, but have technical defects such as axial size redundancy and reduced dynamic balance accuracy. In addition, the connection structures of split gears generally have the problems of complicated assembly and insufficient torsional strength, and connection failure may occur under heavy load conditions. SUMMARY

[0003] The utility model aims at solving the technical bottleneck of the spiral bevel gear in the prior art: the mounting holes are designed with a fixed single diameter, and when the specifications of the transmission shafts change, the gears need to be replaced as a whole or adapter flanges need to be configured, which increases the material inventory pressure and the cost of equipment modification. Existing adjustable gears mostly use an expanded sleeve connection scheme, but have technical defects such as axial size redundancy and reduced dynamic balance accuracy. In addition, the connection structures of split gears generally have the problems of complicated assembly and insufficient torsional strength, and a high adaptability spiral bevel gear is provided.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A high adaptability spiral bevel gear, comprising a spiral bevel gear body and a plurality of mounting blocks, the sizes of the mounting blocks decrease in steps and the mounting holes inside the mounting blocks decrease in an arithmetic progression, and the spiral bevel gear body and the mounting blocks are connected through the mounting holes.

[0006] First fixed blocks are fixed on both sides of the spiral bevel gear body, second fixed blocks are fixed on both sides of the mounting blocks, and mechanical interlocking is formed between adjacent second fixed blocks through dovetail-shaped insertion blocks and second rectangular holes.

[0007] A floating compression mechanism composed of an arc-shaped compression plate and a compression spring is connected between the first fixed blocks and the second fixed blocks, the arc-shaped compression plate is compressed under the elastic force of the compression spring, the insertion blocks are compressed, and the contact stress of the connection interface reaches 85MPa.

[0008] The second fixed block is internally provided with a strip-shaped limiting plate, the strip-shaped limiting plate is pre-tightened by a tension spring and forms a wedge-shaped compression structure with the insertion block of the adjacent mounting block, so that the overall coaxiality of the multiple spliced blocks is maintained within 0.015mm.

[0009] In a possible design, the diameter of the mounting hole covers 15mm to 45mm, and includes three stepped holes with a diameter difference of 5mm each, which is suitable for a involute spline shaft.

[0010] In a possible design, the head width of the dovetail-shaped insertion block is 5mm, the root width is 8mm, the second rectangular hole is provided with a 15° guide slope at the entrance, and the inner wall of the hole is plated with a hard chromium layer.

[0011] In a possible design, the floating compression mechanism includes an arc-shaped pressing plate arranged in the first rectangular cavity, the arc-shaped pressing plate is connected with the end face of the first rectangular cavity through two compression springs, and the arc-shaped pressing plate protrudes the bottom surface of the first rectangular hole by 1.5mm in a free state.

[0012] In a possible design, the second fixed block is internally provided with a second rectangular cavity, both sides of the second rectangular cavity are provided with side grooves, both sides of the strip-shaped limiting plate are fixedly connected with side blocks, the side blocks are slidingly connected in the side grooves, the side blocks of the strip-shaped limiting plate are slidingly matched with the side grooves of the second rectangular cavity, and when the stretching amount of the tension spring is 8mm, the end of the strip-shaped limiting plate is embedded into the second rectangular hole of the rear mounting block.

[0013] In a possible design, the first fixed block is provided with an adjusting screw, the adjusting screw controls the retraction and reset of the arc-shaped pressing plate through a push plate, so that the assembly tolerance compensation range is expanded to ±0.15mm.

[0014] In a possible design, the main body of the spiral bevel gear is made of 20CrMnTi alloy steel subjected to carburizing and quenching treatment, and a plurality of teeth with a helix angle of 35° are uniformly distributed on the outer edge.

[0015] In a possible design, the arc surface curvature radius of the arc-shaped pressing plate is consistent with the outer circle of the mounting block, and the pre-tightening force of the compression spring is 1200N.

[0016] In a possible design, the maximum outer diameter of the mounting block forms an interference fit of 0.02mm with the inner diameter of the mounting hole of the spiral bevel gear main body, and the outer diameters of the subsequent mounting blocks are gradually reduced by 5mm.

[0017] In the application, power transmission is completed by the meshing of the two arc tooth gear bodies, the rotating shaft is inserted into the installation hole, and the rotating shaft and the arc tooth gear body are connected, in order to adapt to rotating shafts of different sizes, different sizes of mounting blocks can be installed in sequence, because the sizes of the mounting blocks are different, the installation holes in them are also different, and then rotating shafts of different sizes can be adapted;

[0018] When the mounting blocks are installed, the adjusting screw is first rotated, the adjusting screw drives the push plate to move horizontally, and then one side of the push plate no longer abuts against the arc-shaped pressing plate, the braking state of the arc-shaped pressing plate is released, the mounting blocks are first spliced, and the mounting blocks are spliced by the engagement of the adjacent insertion blocks and the second rectangular hole, so that the connection process can be quickly completed.

[0019] After the mounting blocks are connected, the mounting blocks are inserted into the installation hole, the insertion block at one end of the second fixing block is inserted into the first rectangular hole, and the arc-shaped arrangement of the arc-shaped pressing plate can ensure the normal insertion of the insertion block. After the insertion block is inserted, the arc-shaped pressing plate is reset under the elastic force of the compression spring, and then the arc-shaped pressing plate can press the insertion block. The reset arc-shaped pressing plate can drive the side edge block on the side to move horizontally, the side edge block stretches the tension spring, one end of the strip-shaped limiting plate protrudes, and the subsequent insertion block is pressed tightly. The next strip-shaped limiting plate can also be pushed horizontally to ensure the stability of the connection of the mounting blocks, and the use is convenient.

[0020] Beneficial effects: the application realizes full coverage of the radial size of the transmission shaft through the modular installation structure, adopts a stepped mounting block combination design, sets up installation holes with a decreasing diameter in an arithmetic progression, and adapts to standard transmission shafts with a diameter ranging from 15 mm to 45 mm.

[0021] The mechanical interlocking between adjacent mounting blocks is formed by the dovetail-shaped insertion block and the rectangular hole, and the wedge-shaped pressing structure of the strip-shaped limiting plate, so that the contact stress of the connection interface reaches 85 MPa, and the torsional strength exceeds 92% of the overall gear. The floating pressing mechanism composed of the arc-shaped pressing plate and the compression spring has a micro-deformation compensation ability of within 0.02 mm under vibration conditions, which ensures the transmission accuracy.

[0022] The pre-tightening force adjusting device composed of the adjusting screw and the push plate expands the assembly tolerance compensation range to ±0.15 mm, and significantly reduces the requirement for machining accuracy.

[0023] The modular design makes a single gear body match seven types of mounting blocks, reduces the inventory cost by 63%, and shortens the maintenance time by 75% when only the worn mounting blocks need to be replaced. The double-rectangular-cavity guide rail structure cooperates with the tension spring pre-tightening mechanism to keep the overall coaxiality of the spliced blocks within 0.015 mm, which exceeds the 6th level of precision requirement of ISO 1328-1 standard.

[0024] The scheme realizes the standardization and modularization upgrade of the transmission components under the premise of ensuring the transmission performance through mechanical structure innovation, and is especially suitable for the flexible manufacturing demand of the multi-variety and small-batch transmission system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A three-dimensional structural schematic view of a high-adaptability spiral bevel gear is provided for the utility model;

[0026] Figure 2 A three-dimensional structural schematic view of a high-adaptability spiral bevel gear from a second perspective is provided for the utility model;

[0027] Figure 3 An exploded view of a high-adaptability spiral bevel gear is provided for the utility model;

[0028] Figure 4 A three-dimensional structural schematic view of a first fixing block and a second fixing block in a high-adaptability spiral bevel gear is provided for the utility model;

[0029] Figure 5 A three-dimensional sectional view structural schematic view of a first fixing block in a high-adaptability spiral bevel gear is provided for the utility model;

[0030] Figure 6 An exploded view of a second fixing block and a strip-shaped limiting plate in a high-adaptability spiral bevel gear is provided for the utility model.

[0031] In the figure: 1, spiral bevel gear main body; 2, mounting block; 3, first fixing block; 4, mounting hole; 5, second fixing block; 6, strip-shaped limiting plate; 7, arc-shaped pressing plate; 8, adjusting screw; 9, pushing plate; 10, compression spring; 11, second rectangular cavity; 12, first rectangular hole; 13, first rectangular cavity; 14, side block; 15, tension spring; 16, second rectangular hole; 17, side slot; 18, plug-in block. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0033] Embodiment 1; refer to Figures 1-6The utility model relates to a high adaptability spiral bevel gear, the spiral bevel gear body 1 adopts the 20CrMnTi alloy steel of carburizing quenching processing to manufacture, and the outer edge is evenly distributed 45 helix angle 35 DEG tooth.

[0034] The first fixed block 3 is welded on both sides of the spiral bevel gear body 1, and four first fixed blocks 3 are arranged on each spiral bevel gear body 1 and symmetrically distributed on both sides of the axis of the spiral bevel gear body 1. The first fixed block 3 is provided with a first rectangular hole 12 at the end, the hole depth is 12 mm, and the bottom of the hole is connected with a first rectangular cavity 13. An arc-shaped pressing plate 7 is embedded in the first rectangular cavity 13, the arc-shaped pressing plate 7 is made of 65Mn spring steel, and the curvature radius of the arc surface is consistent with the outer circle of the mounting block 2. The arc-shaped pressing plate 7 is connected with the end face of the first rectangular cavity 13 through two φ3mm compression springs 10, and the free state spring pre-tightening force makes the arc-shaped pressing plate 7 protrude from the bottom of the first rectangular hole 12 by 1.5mm. An M8 threaded hole is formed in the side surface of the first fixed block 3, an adjusting screw 8 is screwed into the rear end part to connect a pushing plate 9 through a thrust bearing, and the pushing plate 9 is made of polytetrafluoroethylene, and the thickness of the pushing plate 9 is smaller than the width of the first rectangular cavity 13 by 0.1mm.

[0035] The second fixed block 5 is welded on both sides of the mounting block 2, and four second fixed blocks 5 are arranged on each mounting block 2. The second fixed block 5 is provided with a dovetail-shaped insertion block 18 at the end, the insertion block 18 is 10mm long, the head part is 5mm wide, the root part is 8mm wide, and the insertion block 18 is precisely matched with the second rectangular hole 16 of the adjacent mounting block 2. A 15 DEG lead-in angle is arranged at the entrance of the second rectangular hole 16, and the inner wall of the hole is plated with hard chromium. A second rectangular cavity 11 is formed in the second fixed block 5, a strip-shaped limiting plate 6 is arranged in the cavity, the limiting plate 6 is made of 40Cr material and is quenched and tempered, and the surface hardness of the limiting plate 6 is HRC45. Side edge blocks 14 are welded on both sides of the limiting plate 6, the side edge blocks 14 are embedded in side edge grooves 17 on both sides of the second rectangular cavity 11, φ2mm tension springs 15 are arranged in the side edge grooves 17, and the limiting plate 6 is kept in the protruding state in the free state.

[0036] During assembly, first, the adjusting screw 8 is screwed into the first fixed block 3, and the push plate 9 is pressed to compress the arc-shaped pressing plate 7 into the first rectangular cavity 13 completely. The first installation block 2 is inserted into the installation hole 4 of the main body 1, and the insertion block 18 of the second fixed block 5 is inserted along the first rectangular hole 12, and the arc-shaped pressing plate 7 is reset under the action of the compression spring 10, and the compression force reaches 1200 N. Continue to insert the secondary installation block 2, and the insertion block 18 of the rear installation block 2 pushes the front limiting plate 6 to move transversely, and when the tensile spring 15 is stretched by 8 mm, the end of the limiting plate 6 is embedded in the second rectangular hole 16 of the rear installation block 2, forming mechanical interlocking. After the nesting installation of the three installation blocks 2 is completed in turn, the adjusting screw 8 is unscrewed in reverse, the push plate 9 releases the constraint on the arc-shaped pressing plate 7, and the arc-shaped pressing plate 7 compresses the insertion block 18 of the last installation block 2 under the action of the spring force, forming double locking.

[0037] The structure realizes full coverage of the radial size of the transmission shaft, and the installation block 2 can be combined to adapt to 11 standard shaft diameters of 15 mm to 45 mm. The modular design makes the gear main body 1 reusable, and only the worn installation block 2 needs to be replaced, reducing the maintenance cost by 60%. The overall torsional strength of the three installation blocks 2 after connection reaches 8500 N·m, which is 90% higher than that of the integral gear. The dovetail-shaped contact stress of the insertion block 18 and the rectangular hole reaches 95 MPa, and the micro-deformation compensation ability of 0.03 mm is maintained under vibration conditions. The pre-tightening force adjustment range of the adjusting screw 8 is ±0.2 mm, the assembly tolerance compensation ability is improved by 3 times, and the machining precision requirement is significantly reduced.

[0038] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A highly adaptable spiral bevel gear, characterized in that, include: The spiral bevel gear body (1) and multiple mounting blocks (2) are provided. The size of the multiple mounting blocks (2) decreases in a stepwise manner and the mounting holes (4) with diameters decreasing in an arithmetic sequence are provided inside. The spiral bevel gear body (1) and the mounting blocks (2) are connected by the mounting holes (4). The main body (1) of the spiral bevel gear is fixed with a first fixing block (3) on both sides, and the mounting block (2) is fixed with a second fixing block (5) on both sides. The adjacent second fixing blocks (5) are mechanically interlocked with the second rectangular hole (16) through a dovetail-shaped plug-in block (18). A floating clamping mechanism, the floating clamping mechanism including an arc-shaped pressure plate (7) disposed in a first rectangular cavity (13), the arc-shaped pressure plate (7) being connected to the end face of the first rectangular cavity (13) by two compression springs (10); The first fixing block (3) and the second fixing block (5) are connected by a floating pressing mechanism consisting of an arc-shaped pressure plate (7) and a compression spring (10). The arc-shaped pressure plate (7) presses the plug-in block (18) under the elastic force of the compression spring (10), so that the contact stress at the connection interface reaches 85MPa. The second fixing block (5) is provided with a strip-shaped limiting plate (6). The strip-shaped limiting plate (6) is pre-tightened by a tension spring (15) and forms a wedge-shaped pressing structure with the plug-in block (18) of the adjacent mounting block (2), so that the overall coaxiality of the multiple blocks after splicing is kept within 0.015mm.

2. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The mounting hole (4) has a diameter ranging from 15mm to 45mm and includes three stepped holes with a diameter difference of 5mm between each stepped hole, which is suitable for involute spline shafts.

3. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The dovetail-shaped plug block (18) has a head width of 5mm and a root width of 8mm. The second rectangular hole (16) has a 15° guide slope at the entrance and a hard chrome plating on the inner wall of the hole.

4. The highly adaptable spiral bevel gear according to claim 1, characterized in that, In the free state, the arc-shaped pressure plate (7) protrudes 1.5mm from the bottom surface of the first rectangular hole (12).

5. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The second fixed block (5) has a second rectangular cavity (11) inside. The second rectangular cavity (11) has side grooves (17) on both sides. The strip limiting plate (6) has side blocks (14) fixedly connected to both sides. The side blocks (14) are slidably connected inside the side grooves (17). The side blocks (14) of the strip limiting plate (6) are slidably engaged with the side grooves (17) of the second rectangular cavity (11). When the tension of the tension spring (15) is 8mm, the end of the strip limiting plate (6) is embedded in the second rectangular hole (16) of the rear mounting block (2).

6. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The first fixing block (3) is provided with an adjusting screw (8), which controls the retraction and reset of the arc-shaped pressure plate (7) through the push plate (9), so that the assembly tolerance compensation range is extended to ±0.15mm.

7. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The main body (1) of the spiral bevel gear is made of 20CrMnTi alloy steel that has been carburized and quenched, and multiple teeth with a helix angle of 35° are evenly distributed on the outer edge.

8. The highly adaptable spiral bevel gear according to claim 1, characterized in that, The radius of curvature of the arc-shaped pressure plate (7) is consistent with the outer circle of the mounting block (2), and the preload of the compression spring (10) is 1200N.

9. The highly adaptable spiral bevel gear according to any one of claims 1 to 8, characterized in that, The maximum outer diameter of the mounting block (2) forms an interference fit of 0.02 mm with the inner diameter of the mounting hole (4) of the spiral bevel gear body (1), and the outer diameter of the subsequent mounting blocks (2) decreases by 5 mm at each step.

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