Clamping mechanism with internal spline input shaft

Abstract

The utility model relates to a clamping mechanism for an input shaft with an internal spline, which belongs to the technical field of gear measurement, and is characterized in that after an internal and external spline sleeve is manually placed into an internal spline of an input shaft gear, the input shaft and the internal and external spline sleeve are together placed into a limiting ring to perform coarse positioning on the input shaft gear, and at the moment, an upper tip automatically rotates and descends; the outer spline housing can automatically enter the inner and outer spline housing located in the input shaft gear, the upper center abuts against an upper center hole of the input shaft gear, the limiting ring is separated from a bearing position of the gear, the upper center and the lower center complete clamping of the gear, and at the moment, the load of a driving shaft system can be transmitted into the input shaft gear through cooperation of splines. The positioning mechanism can be applied to gear single-face meshing detection or gear ghost frequency noise detection.

Description

A clamping mechanism with an internal spline input shaft Technical Field

[0001] This utility model relates to the field of gear measurement technology. Background Technology

[0002] With the development of new energy vehicles, the impact of input shaft gears with internal splines on vehicle quality is becoming increasingly significant. During the high-speed operation of the motor, the ghost frequency noise of the gears directly affects the user experience of new energy vehicles. Therefore, it is necessary to perform ghost frequency detection on the gears before assembly. When performing ghost frequency detection on the gears, it is necessary to accurately position the gears and apply high loads to them.

[0003] Because gear ghost frequency detection is high-speed and high-load, it is not allowed to manually remove the workpiece after the measurement is started. The workpiece must be manually placed into the lower center, and the remaining clamping and load application must be done automatically. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems and to design a clamping mechanism with high positioning accuracy, high load capacity, and no need for manual intervention after manual loading.

[0005] A clamping mechanism with an input shaft featuring an internal spline is characterized in that: an upper center is fixed to a drive shaft system by screws; the upper center is hollow, with the lower hollow portion serving as an internal spline and the upper hollow portion as a smooth hole; an outer spline sleeve is inserted into the internal spline of the upper center; a retaining ring groove is provided at the upper end of the outer spline sleeve, and a retaining ring is fixed within the retaining ring groove of the outer spline sleeve; a compression spring is placed at the upper hollow portion of the upper center, with the lower end of the compression spring tightly against the upper end of the retaining ring and the upper end of the compression spring tightly against the inner end face of the drive shaft system cavity, thereby realizing the function of elastic up-and-down movement of the outer spline sleeve within the internal spline of the upper center; the outer circle of the inner and outer spline sleeves is the external spline, and the inner hole of the inner and outer spline sleeves is the internal spline; the inner and outer spline sleeves function as a spline diameter converter; the upper inner end of the input shaft gear is the internal spline, and the upper and lower end faces of the input shaft gear are reference center holes. The lower outer diameter of the input shaft gear is the bearing seat. The lower inner hole of the limiting ring is fixed to the movable lower center with an interference fit, allowing the limiting ring to rotate with the movable lower center. In use, the bearing seat of the input shaft gear is placed directly in the upper inner hole of the limiting ring with a small clearance fit, which serves to provide coarse positioning and prevent the workpiece from tipping over. The inner and outer spline sleeves are placed in the inner spline of the input shaft gear. The upper ends of the inner and outer spline sleeves have a large taper guide, which can fit precisely on the internal chamfer of the input shaft gear to prevent the inner and outer spline sleeves from falling out. The upper center hits the upper center hole of the input shaft gear. At this time, the outer spline sleeve is inserted into the inner spline of the inner and outer spline sleeves. The outer spline sleeve drives the inner and outer spline sleeves, which in turn drive the input shaft gear, thus transferring the load of the drive shaft system to the workpiece and providing a high load for ghost frequency measurement.

[0006] The advantages of this invention compared to the prior art are: it directly positions the workpiece through the upper and lower centers, resulting in high clamping accuracy; it transmits the load through a spline method, which is lower in cost and transmits a larger load compared to the traditional expansion mandrel method; and it only requires placing the workpiece into the positioning ring, while the rest of the clamping actions can be completed automatically. Attached Figure Description

[0007] Figure 1 is a cross-sectional view of the present invention after normal clamping.

[0008] Figure 2 is a cross-sectional view of the embodiment of this utility model before clamping. Detailed Implementation

[0009] A clamping mechanism with an internal spline input shaft comprises: a drive shaft system 1, an upper center 2, a compression spring 3, a retaining ring 4, an external spline sleeve 5, internal and external spline sleeves 6, an input shaft gear 7, a limiting ring 8, and a movable lower center 9.

[0010] The upper center 2 is fixed to the drive shaft 1 by screws. The upper center 2 is hollow inside, with the lower hollow part being an internal spline and the upper hollow part being a smooth hole. The outer spline sleeve 5 is inserted into the internal spline of the upper center 2. The upper end of the outer spline sleeve 5 is provided with a retaining ring groove, and the retaining ring 4 is fixed in the retaining ring groove of the outer spline sleeve 5. The compression spring 3 is placed in the upper hollow part of the upper center 2, with the lower end of the compression spring 3 closely attached to the upper end of the retaining ring 4 and the upper end of the compression spring 3 closely attached to the end face of the inner cavity of the drive shaft 1. This realizes the function of elastic up and down movement of the outer spline sleeve 5 in the internal spline of the upper center 2. The outer circle of the inner and outer spline sleeves 6 is an external spline, and the inner hole of the inner and outer spline sleeves 6 is an internal spline. The inner and outer spline sleeves 6 serve as a spline diameter changer. The upper end of the input shaft gear 7 is an internal spline, and the upper and lower end faces of the input shaft gear 7 are reference center holes. The lower outer circle of the input shaft gear 7 is... The bearing seat of the gear and the lower inner hole of the limiting ring 8 are fixed to the movable lower center 9 by an interference fit, so that the limiting ring 8 can rotate together with the movable lower center 9. In use, the bearing seat of the input shaft gear 7 is placed directly in the upper inner hole of the limiting ring 8 with a small clearance fit, which plays the role of coarse positioning and preventing the workpiece from tipping over. The inner and outer spline sleeves 6 are placed in the inner spline of the input shaft gear 7. The upper end of the inner and outer spline sleeves 6 has a large taper guide, which can be locked on the inner chamfer of the input shaft gear 7 to prevent the inner and outer spline sleeves 6 from falling out. The upper center 2 hits the upper center hole of the input shaft gear 7. At this time, the outer spline sleeve 5 is inserted into the inner spline of the inner and outer spline sleeves 6. The outer spline sleeve 5 drives the inner and outer spline sleeves 6, and the inner and outer spline sleeves 6 drive the input shaft gear 7, which realizes the function of transferring the load of the drive shaft system 1 to the workpiece, providing a high load for ghost frequency measurement.

[0011] The operation of a clamping mechanism with an internal spline input shaft is as follows: The internal and external spline sleeves 6 are manually inserted into the internal spline of the input shaft gear 7. Then, the input shaft gear 7, along with the internal and external spline sleeves 6, is placed into the limiting ring 8. At this point, the input shaft gear 7 is coarsely positioned and will not tilt. Then, the upper center 2 automatically rotates and descends. During this rotation, the external spline sleeve 5 automatically rotates into the internal and external spline sleeves 6. Then, the upper center 2 pushes against the upper center hole of the input shaft gear 7. At this point, the upper center 2 and the movable lower center 9 complete the precise positioning of the input shaft gear 7. The power of the drive shaft system 1 is then transmitted to the input shaft gear 7 through spline transmission, providing a high load for ghost frequency measurement. During the rotation and descent of the upper center 2, the external spline sleeve 5 may fail to properly enter the internal and external spline sleeves 6. In this case, the compression spring 3 is compressed, and the upper center 2 automatically rises and rotates and descends again until clamping is complete.

Claims

1. A clamping mechanism with an internal spline input shaft, characterized in that, The upper center (2) is hollow inside, with an internal spline in the lower hollow part and a smooth hole in the upper hollow part. The upper center (2) is fixed to the drive shaft (1) by screws. An external spline sleeve (5) is inserted into the internal spline of the upper center (2). A retaining ring groove is provided at the upper end of the external spline sleeve (5). A retaining ring (4) is fixed in the retaining ring groove of the external spline sleeve (5). A compression spring (3) is placed in the upper hollow part of the upper center (2). The lower end of the compression spring (3) is close to the upper end of the snap ring (4), and the upper end of the compression spring (3) is close to the inner end face of the drive shaft (1). The outer circle of the inner and outer spline sleeves (6) is an external spline, and the inner hole of the inner and outer spline sleeves (6) is an internal spline. The inner and outer spline sleeves (6) serve as a spline diameter changer. The upper end of the input shaft gear (7) is an internal spline. The upper and lower end faces of the input shaft gear (7) are reference center holes. The lower end of the input shaft gear (7) is an external spline. The circle is the bearing position of the gear. The lower end of the inner hole of the limiting ring (8) is fixed on the movable lower center (9) by interference fit. Thus, the limiting ring (8) can rotate together with the movable lower center (9). When in use, the bearing position of the input shaft gear (7) is placed directly in the upper end of the inner hole of the limiting ring (8). The inner and outer spline sleeves (6) are placed in the inner spline of the input shaft gear (7). The upper end of the inner and outer spline sleeves (6) has a large taper guide, which can be locked on the inner chamfer of the input shaft gear (7) to prevent the inner and outer spline sleeves (6) from falling out. The upper center (2) hits the upper center hole of the input shaft gear (7). At this time, the outer spline sleeve (5) is inserted into the inner spline of the inner and outer spline sleeves (6). The outer spline sleeve (5) drives the inner and outer spline sleeves (6), and the inner and outer spline sleeves (6) drive the input shaft gear (7) to realize the function of transferring the load of the drive shaft system (1) to the workpiece, providing a high load for ghost frequency measurement.

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