A spline sleeve outer circle processing inner tension spline mandrel device

Abstract

The utility model belongs to the technical field of machining, and relates to a kind of inner tensioning spline mandrel device of spline sleeve outer circle processing, it include: spline mandrel, spline rack, base shaft;Spline mandrel is equipped with inclined groove, spline rack is slid in inclined groove, and spline rack is connected base shaft;The utility model provides tangential tension along circumference by spline rack along inclined groove sliding, so that the tooth side of spline tooth on spline rack and the tooth side of spline tooth on spline mandrel form opposite direction's force of action to the inner spline of spline sleeve, to tension spline sleeve, and therefore the utility model can improve the coaxiality of spline mandrel: by the synergistic effect of double-side spline tooth, realize even tensioning all around, effectively avoid radial deviation, improve the coaxiality after processing.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, specifically relating to a device for internal tensioning spline mandrels for machining the outer circle of a spline sleeve. Background Technology

[0002] A spline connection is a common type of shaft-hub connection in mechanical engineering. It achieves torque transmission, guidance, or positioning by machining a series of mating teeth (keys) and grooves (keyways) on the contact surfaces of the shaft and hub. Compared to traditional simple key connections such as flat keys and semi-circular keys, spline connections offer higher load-bearing capacity, better alignment, and a longer service life. In current mechanical transmission systems, spline connections are widely used due to their high efficiency and stability.

[0003] However, the existing internally tensioned spline mandrel design has significant shortcomings in the machining of the outer diameter of the spline sleeve. Specifically, single-head tensioning causes radial displacement of the untensioned portion, affecting the coaxiality after machining and thus impacting transmission efficiency and stability. While double-head tensioning can improve coaxiality to some extent, it makes it difficult to remove the workpiece after machining, increasing the complexity and time cost of production operations.

[0004] Therefore, a splined mandrel that does not affect coaxiality and is easy to disassemble is needed to solve this technical problem. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a spline mandrel device for machining the outer circle of a spline sleeve, comprising: a spline mandrel, a spline rack, and a base shaft; the end of the spline mandrel with an external spline is cylindrical, the spline size of the spline mandrel is smaller than the spline size of the tension fit, an inclined groove is provided on the outer circumference of the end of the spline mandrel with the external spline, the inclined groove connects the outer circumference of the spline mandrel and the inside of the cylinder of the spline mandrel radially, the inclined groove is a square groove, and the length direction of the inclined groove is at an angle to the axial direction of the spline mandrel;

[0006] The spline rack is long and narrow, with a width smaller than the width of the inclined groove and a length smaller than the length of the inclined groove. The outer spline of the spline rack has the same dimensions as the spline of the spline spindle. The spline rack has radially inward rack mounting holes.

[0007] The shaft diameter of the base shaft is the same as the inner diameter of the cylinder of the spline mandrel. The outer circumference of the base shaft is provided with a base shaft mounting hole that runs radially inward and matches the rack mounting hole.

[0008] During tensioning installation, the base shaft is inserted into the cylinder of the spline mandrel, and the spline rack is embedded in the inclined groove from the outside to the inside. The spline rack is detachably connected to the base shaft through the rack mounting hole and the base shaft mounting hole. Pushing the base shaft axially will tension the spline mandrel inside the spline sleeve.

[0009] Preferably, the spline rack is elongated and tile-shaped, and the inner curvature of the spline rack is the same as the outer circumferential curvature of the base shaft.

[0010] Preferably, the rack mounting hole includes at least one screw hole and one pin hole, with a countersunk bolt disposed in the screw hole and a countersunk pin disposed in the pin hole.

[0011] More preferably, the rack mounting hole includes at least one screw hole and two pin holes, with the screw hole located between the two pin holes.

[0012] Preferably, the inclined grooves are provided in multiple ways, and the inclined grooves are evenly distributed around the circumference of the spline mandrel. Each inclined groove is provided with a spline rack.

[0013] Preferably, the angle between the length direction of the inclined groove and the axial direction of the spline mandrel is in the range of 2° to 10°.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model can improve the coaxiality of the spline mandrel: through the synergistic effect of the spline teeth on both sides, uniform tension is achieved throughout the circumference, effectively avoiding radial offset and improving the coaxiality after processing.

[0016] 2. The spline mandrel of this utility model is easy to disassemble: Compared with double-head tensioning, this device makes it easier to remove the workpiece after processing, simplifying production operations and improving production efficiency.

[0017] 3. This utility model can extend the service life of spline mandrels: by dispersing tension force, stress concentration in individual parts is reduced, thus extending the service life of the mandrel and workpiece. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an internal tensioning spline mandrel device for machining the outer circle of a spline sleeve according to this utility model;

[0019] Figure 2 This is a schematic diagram of the spline rack of this utility model;

[0020] Figure 3 This is a schematic diagram of the axial installation of the spline mandrel of this utility model;

[0021] Figure 4 This is a before-and-after comparison diagram of the installation of this utility model.

[0022] Among them, 1. Splined mandrel; 2. Splined rack; 3. Base shaft; 4. Inclined groove; 5. Rack mounting hole; 6. Base shaft mounting hole. Detailed Implementation

[0023] The relevant technologies of this 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 this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The internal tensioning spline mandrel device for machining the outer diameter of a spline sleeve according to this embodiment includes: a spline mandrel 1, a spline rack 2, and a base shaft 3; the end of the spline mandrel 1 with the external spline is cylindrical, and the spline size of the spline mandrel 1 is smaller than the spline size for tensioning; an inclined groove 4 is provided on the outer circumference of the end of the spline mandrel 1 with the external spline, and the inclined groove 4 connects the outer circumference of the spline mandrel 1 and the inner cylinder of the spline mandrel 1 radially; the inclined groove 4 is a square groove, and the length direction of the inclined groove 4 is at an angle to the axial direction of the spline mandrel 1; the spline rack 3... The spline rack 2 is elongated, with its width less than the width of the inclined groove 4 and its length less than the length of the inclined groove 4. The outer spline of the spline rack 2 has the same dimensions as the spline of the spline mandrel 1. The spline rack 2 has radially inwardly oriented rack mounting holes 5. The shaft diameter of the base shaft 3 is the same as the inner diameter of the cylinder of the spline mandrel 1. The outer circumference of the base shaft 3 has radially inwardly oriented base shaft mounting holes 6, which match the rack mounting holes 5. During tensioning, the base shaft 3 passes through the cylinder of the spline mandrel 1, and the spline... The spline rack 2 is embedded in the inclined groove 4 from the outside in. The spline rack 2 is detachably connected to the base shaft 3 through the rack mounting hole 5 and the base shaft mounting hole 6. Pushing the base shaft 3 axially will tension the spline mandrel 1 within the spline sleeve. Since there is an angle between the inclined groove 4 and the axial direction of the spline mandrel 1, and the spline rack 2 slides within the inclined groove 4, while the spline rack 2 is fixedly connected to the base shaft 3, when the base shaft 3 is subjected to external force and moves axially, the spline rack 2 slides within the inclined groove 4, causing the base shaft 3 to rotate at a small angle. The greater the axial movement distance of shaft 3, the greater the arc of spline rack 2 moving along the circumferential tangent direction. At this time, the tooth flanks of the spline teeth on spline rack 2 and the tooth flanks of the spline teeth on spline mandrel 1 exert opposite forces on the inner spline of the spline sleeve, thereby tensioning the spline sleeve. When the spline sleeve needs to be loosened after machining is completed, simply move the base shaft 3 in the opposite direction, and the spline rack 2 will move in the opposite direction along the circumferential tangent. The force between the tooth flanks of the spline teeth on spline rack 2 and the tooth flanks of the spline teeth on spline mandrel 1 will gradually decrease until it is eliminated, thereby loosening the spline sleeve.

[0025] Furthermore, the spline rack 2 is elongated and tile-shaped, and the inner curvature of the spline rack 2 is the same as the outer circumferential curvature of the base shaft 3. The inner curvature of the tile-shaped spline rack 2 matches the curvature of the base shaft 3, so that the spline rack 2 has better mechanical properties and rigidity after being connected and fixed to the base shaft 3, and provides better tension force.

[0026] Furthermore, the rack mounting hole 5 includes at least one screw hole and one pin hole. A countersunk bolt is installed in the screw hole, and a countersunk pin is installed in the pin hole. The screw hole is used for axial fixed connection, and the pin hole is used to ensure that the key rack 2 and the base shaft 3 have better rigidity. The pin connection has higher precision than the threaded connection and is conducive to quick installation and disassembly.

[0027] Furthermore, the rack mounting hole 5 includes at least one screw hole and two pin holes, with the screw hole located between the two pin holes.

[0028] Furthermore, the inclined groove 4 is provided in multiple ways, and the inclined groove 4 is evenly distributed around the circumference of the spline mandrel 1. Each inclined groove 4 is provided with a spline rack 2. The even distribution of multiple racks makes the tension of the spline mandrel 1 more uniform and the eccentricity smaller. However, the loading and unloading efficiency of multiple racks is low. Therefore, it is advisable to configure spline racks 2 in 2 to 4 inclined grooves 4.

[0029] Furthermore, the angle between the length direction of the inclined groove 4 and the axial direction of the spline mandrel 1 is in the range of 2° to 10°. The angle range should not be too large, otherwise the tension force can be evenly distributed along the axial direction. The angle range should not be too small either, otherwise the base shaft 3 will have a longer stroke, which is not conducive to processing. Therefore, 2° to 10° is the optimal range.

[0030] Example

[0031] In this embodiment of the spline sleeve outer diameter machining and inner tensioning spline mandrel device, the spline mandrel base has a spline dimension slightly smaller than the designed spline mating dimension, reserving space for subsequent rack clamping. The slotted structure has an inclined slot in the middle of the spline mandrel's length direction for installing and guiding the spline rack for clamping. The spline rack is designed with spline teeth that match the splines of the spline mandrel base and can slide freely within the inclined slot. When pushed by an external force, the spline rack moves along the inclined direction of the slot. The spline teeth on one side push the spline teeth of the spline mandrel base towards the inner spline, while the spline teeth on the other side press against the inner spline, creating an effective tensioning and clamping effect.

[0032] In summary, this invention provides tangential tension along the circumference by sliding the spline rack along the inclined groove. This causes the tooth flanks of the spline teeth on the spline rack and the tooth flanks of the spline teeth on the spline mandrel to exert opposite forces on the inner spline of the spline sleeve, thereby tensioning the spline sleeve. Therefore, this invention can improve the coaxiality of the spline mandrel: through the synergistic effect of the spline teeth on both sides, uniform tension is achieved throughout the circumference, effectively avoiding radial offset and improving the coaxiality after machining.

[0033] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A device for internally tensioning a spline mandrel during the machining of the outer diameter of a spline sleeve, characterized in that, include: Spline mandrel (1), spline rack (2), base shaft (3); the spline mandrel (1) has a cylindrical end with an external spline, the spline size of the spline mandrel (1) is smaller than the spline size of the tension fit, the outer circumference of the spline mandrel (1) with an external spline is provided with an inclined groove (4), the inclined groove (4) connects the outer circumference of the spline mandrel (1) and the cylinder of the spline mandrel (1) in the radial direction, the inclined groove (4) is a square groove, and the length direction of the inclined groove (4) is at an angle with the axial direction of the spline mandrel (1); The spline rack (2) is long and narrow. The width of the spline rack (2) is smaller than the width of the inclined groove (4). The length of the spline rack (2) is smaller than the length of the inclined groove (4). The outer spline of the spline rack (2) is the same size as the spline of the spline spindle (1). The spline rack (2) is provided with a rack mounting hole (5) that runs radially inward. The shaft diameter of the base shaft (3) is the same as the inner diameter of the cylinder of the spline mandrel (1). The base shaft (3) has a base shaft mounting hole (6) that runs radially inward on its outer circumference. The base shaft mounting hole (6) matches the rack mounting hole (5). During tensioning installation, the base shaft (3) passes through the cylinder of the spline mandrel (1), and the spline rack (2) is embedded in the inclined groove (4) from the outside to the inside. The spline rack (2) is detachably connected to the base shaft (3) through the rack mounting hole (5) and the base shaft mounting hole (6). Pushing the base shaft (3) axially will tension the spline mandrel (1) in the spline sleeve.

2. The device for machining the outer diameter of a spline sleeve and internally tensioning a spline mandrel according to claim 1, characterized in that, The spline rack (2) is long and tile-shaped, and the inner arc of the spline rack (2) is the same as the outer circumferential arc of the base shaft (3).

3. The device for machining the outer diameter of a spline sleeve and internally tensioning a spline mandrel according to claim 1, characterized in that, The rack mounting hole (5) includes at least one screw hole and one pin hole, wherein a countersunk bolt is disposed in the screw hole and a countersunk pin is disposed in the pin hole.

4. The device for machining the outer diameter of a spline sleeve and internally tensioning a spline mandrel according to claim 3, characterized in that, The rack mounting hole (5) includes at least one screw hole and two pin holes, with the screw hole located between the two pin holes.

5. The device for machining the outer diameter of a spline sleeve and internally tensioning a spline mandrel according to claim 1, characterized in that, The inclined groove (4) is provided in multiple ways. The inclined groove (4) is evenly distributed around the circumference of the spline spindle (1). Each inclined groove (4) is provided with a spline rack (2).

6. The device for machining the outer diameter of a spline sleeve and internally tensioning a spline mandrel according to claim 1, characterized in that, The angle between the length direction of the inclined groove (4) and the axial direction of the spline mandrel (1) is in the range of 2° to 10°.

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