Telescopic spline centering mechanism

Abstract

The utility model discloses a telescopic spline centering mechanism which comprises a driving shaft and a centering shaft which are coaxially connected, the end, facing the driving shaft, of the centering shaft is provided with a spring cavity which is coaxially arranged, the bottom of the spring cavity is coaxially provided with a transmission hole in a penetrating mode, and the transmission hole is provided with a guide structure arranged in the axial direction. A transmission shaft is matched with the transmission hole in an axial moving mode, and a spring is connected between the inner end of the transmission shaft and the driving shaft in an abutting mode; and the outer end of the transmission shaft is provided with a spline head matched with an internal spline of a gear to be tested. The telescopic spline centering mechanism has the advantages of being ingenious in structural design, capable of improving spline matching efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile component performance detection, in particular to a telescopic spline centering mechanism. Background Art

[0002] During the manufacturing process, the tooth surface of the gear pair is affected by factors such as processing and manufacturing, which introduces additional errors, causing the gear pair to be excited by the meshing force during the meshing transmission process and produce additional vibration noise. In traditional fuel vehicles, the noise of the engine and other components will mask the noise between the gear pairs, while in new energy electric vehicles, due to the low operating noise of the motor itself, the noise of the gear pair will be abnormally obvious, seriously affecting the comfort of the entire vehicle. For this reason, it is necessary to perform noise detection on the gear pair at the off-line stage of gear pair manufacturing. The two gears of the gear pair need to be clamped on the testing equipment at the same time, one of the gears needs to be driven, and a load is applied to the other gear. Since the driving mechanism and the load mechanism are large in size, in order to reduce the interference between the two, the driving mechanism and the load mechanism need to be at both ends of the gear pair respectively. In this way, the top of one of the gears must be at the lower end, such as Figure 1 As shown, the gear under test has a coaxial inner hole running through it, with an internal spline at one end. The lower end of the gear under test is placed on the center pinion through the inner hole, and the upper end is connected to the output shaft of the drive mechanism via the internal spline. However, during the downward movement of the drive mechanism, the splines on the drive mechanism cannot be guaranteed to mate with the internal splines of the gear under test, resulting in axial contact between the two. Further alignment can damage the equipment or parts. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a telescopic spline centering mechanism with an ingenious structural design that can improve the spline matching efficiency.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A telescopic spline centering mechanism comprises a coaxially connected drive shaft and a centering shaft, the centering shaft having a coaxially arranged spring cavity at one end facing the drive shaft, a transmission hole coaxially arranged through the bottom of the spring cavity, and a guide structure arranged axially on the transmission hole; a transmission shaft is axially movably fitted on the transmission hole, a spring is abutted between the inner end of the transmission shaft and the drive shaft; the outer end of the transmission shaft is provided with a spline head for matching the internal spline of the gear to be measured.

[0006] The above structure connects the drive shaft to the drive mechanism, allowing the drive mechanism to slowly rotate the spline head as it slowly moves toward the internal spline of the gear to be tested. When the spline head and the internal spline of the gear come into contact, the drive shaft compresses the spring inward to prevent impact between the spline head and the internal spline. As the spline head rotates to a position that mates with the internal spline, the drive shaft and the internal spline are pushed out by the spring, completing the engagement of the spline head and the internal spline. This structure avoids impact between the spline head and the internal spline, preventing damage to equipment or parts while also improving spline engagement efficiency.

[0007] Furthermore, the guide structure is a spline arranged on the transmission hole, and the transmission shaft has an external spline matching the spline.

[0008] Furthermore, the external spline is provided inwardly through the axial direction of the transmission shaft, and the inner end of the transmission shaft has an external retaining spring groove extending in the circumferential direction, and the external retaining spring groove is equipped with an external retaining spring baffle.

[0009] Furthermore, the external spline is arranged to penetrate outward along the axial direction of the transmission shaft, and a spline hole matching the external spline is coaxially arranged on the spline head, and the spline head is detachably fitted on the external spline of the transmission shaft through the spline hole.

[0010] In this way, the spline head can be replaced according to the models of the splines in the gear to be tested, so that more models of gears can be adapted for testing.

[0011] Furthermore, the spline hole is provided through the spline head, and an outward end of the spline hole has an inner retaining spring groove extending in the circumferential direction and is matched with an inner retaining spring retaining ring.

[0012] Furthermore, the diameter of the outward end of the spline head gradually decreases and becomes a truncated cone.

[0013] In this way, the spline head can better cooperate with the internal spline of the gear to be tested by utilizing the truncated cone-shaped end.

[0014] Furthermore, the centering shaft has a conical top connection section with a gradually decreasing diameter at one end facing the spline head. The maximum diameter of the top connection section is larger than the inner hole diameter of the gear to be measured, and the minimum diameter is smaller than the inner hole diameter of the gear to be measured.

[0015] In this way, the conical top connection section can be used to cooperate with the inner hole of the gear to be tested to achieve coaxial connection.

[0016] Furthermore, the end of the driving shaft has a coaxially arranged centering hole, and the diameter of the centering hole gradually increases from the inside to the outside; the end of the centering shaft has a centering sleeve protruding toward one end of the driving shaft, and the outer diameter of the centering sleeve gradually decreases in the direction toward the driving shaft, and the taper is consistent with the taper of the centering hole; a locking mechanism is provided between the driving shaft and the centering shaft, so that the centering sleeve is tightly and concentrically fitted in the centering hole.

[0017] Furthermore, the end of the centering sleeve has a positioning groove that is arranged to pass through in the radial direction; the centering hole has a positioning block that protrudes radially inward, and the width of the positioning block matches the width of the positioning groove and fits in the positioning groove.

[0018] Furthermore, the end of the driving shaft has threaded holes evenly distributed along the circumference of the centering hole; the centering shaft has a flange protruding radially outward along the centering sleeve, and the flange has bolt holes corresponding to the threaded holes, and the locking mechanism is a bolt passing through the bolt hole and connected to the threaded hole.

[0019] In summary, the telescopic spline centering mechanism of the present invention has the advantages of ingenious structural design and the ability to improve spline matching efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the cross-sectional structure of the gear to be tested.

[0021] Figure 2 Schematic diagram of the overall structure of the gear clamping structure.

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure.

[0023] Figure 4 Schematic diagram of the exploded structure of the telescopic spline centering mechanism.

[0024] Figure 5 Schematic diagram of the drive shaft structure.

[0025] Figure 6 It is a structural diagram of the anti-tilt clamping mechanism. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with a gear clamping structure adopting the present invention.

[0027] When implementing: Figures 2 to 6 As shown, a gear clamping structure includes a tapered sleeve seat 6 arranged vertically upward, and an anti-tilt clamping mechanism 7 is provided on the tapered sleeve seat 6. Figure 3 and Figure 6 As shown, the anti-tilt clamping mechanism 7 includes a main body 71 that is cylindrical as a whole, one end of the main body 71 has a coaxially arranged centering rod 72, and the other end has a coaxially arranged tip 73, the tip 73 includes a positioning column 731 connected to the main body 71, the end of the positioning column 731 is provided with a conical cone tip 732, the maximum diameter of the cone tip 732 is larger than the inner hole diameter of the gear to be measured; the positioning column 731 is matched with an anti-tilt sleeve 74, the outward end of the anti-tilt sleeve 74 has an anti-tilt hole 741 that matches the end diameter of the gear to be measured, and the anti-tilt hole 741 extends inwardly to the positioning column 731; the distance from the position on the cone tip 732 that is consistent with the inner hole diameter of the gear to be measured to the outer end of the anti-tilt sleeve 74 is less than the end shaft section length of the gear to be measured. The diameter of the centering rod 72 gradually decreases as it moves away from the body 71. The upper end of the tapered sleeve 6 has a vertically arranged tapered hole whose taper matches that of the centering rod 72, and the centering rod 72 fits tightly and coaxially within the tapered hole. In this embodiment, the anti-tilt sleeve 74 has a through-hole at the end facing the body 71. The inner diameter of the hole matches the outer diameter of the positioning post 731, and the sleeve is fitted over the positioning post 731.

[0028] The upper end of the tapered sleeve 6 has a coaxially opposite driving mechanism, and the output end of the driving mechanism is provided with a telescopic spline centering mechanism, and the telescopic spline centering mechanism includes a coaxially connected driving shaft 1 and a centering shaft 2, and the centering shaft 2 has a coaxially arranged spring cavity 21 at one end facing the driving shaft 1, and a transmission hole is coaxially arranged at the bottom of the spring cavity 21, and the transmission hole has a guide structure arranged axially; the transmission hole is axially movably fitted with a transmission shaft 3, and a spring 4 is abutted between the inner end of the transmission shaft 3 and the driving shaft 1; the outer end of the transmission shaft 3 is provided with a spline head 5 for matching with the internal spline of the gear to be measured.

[0029] In this embodiment, the guide structure is a spline provided on the transmission hole, and the transmission shaft 3 has an external spline that matches the spline. The external spline extends axially through the transmission shaft 3 at both ends. The inner end of the transmission shaft 3 has an external retaining spring groove extending circumferentially, and the external retaining spring groove is fitted with an external retaining spring baffle. The spline head 5 is coaxially provided with a spline hole that matches the external spline. The spline head 5 is removably fitted to the external spline of the transmission shaft 3 through the spline hole. In this way, the spline head can be replaced according to the model of the internal spline of the gear to be tested, thereby adapting to a wider range of gear models for testing.

[0030] The spline hole extends through the spline head 5. The outward-facing end of the spline hole has an internal retaining ring groove extending circumferentially and fitted with an internal retaining ring. Furthermore, the outward-facing end of the spline head 5 tapers in diameter to form a frustum. This allows the frustum-shaped end of the spline head to better mate with the internal splines of the gear being tested.

[0031] The end of the centering shaft 2 facing the spline head 5 has a tapered connecting section with a gradually decreasing diameter. The maximum diameter of the connecting section is larger than the inner bore diameter of the gear to be tested, and the minimum diameter is smaller than the inner bore diameter of the gear to be tested. In this way, the tapered connecting section can mate with the inner bore of the gear to be tested to achieve a coaxial connection.

[0032] like Figure 4 and Figure 5 As shown, the end of the drive shaft 1 has a coaxially arranged centering hole 11, and the diameter of the centering hole 11 gradually increases from the inside to the outside; the end of the centering shaft 2 has a centering sleeve 22 protruding toward one end of the drive shaft 1, and the outer diameter of the centering sleeve 22 gradually decreases in the direction toward the drive shaft 1, and the taper is consistent with the taper of the centering hole 11; a locking mechanism is provided between the drive shaft 1 and the centering shaft 2, so that the centering sleeve 22 fits tightly and concentrically in the centering hole 11. The end of the centering sleeve 22 has a positioning groove 23 that is set through in the radial direction; the centering hole 11 has a positioning block 12 that protrudes inward in the radial direction, and the width of the positioning block 12 matches the width of the positioning groove 23 and fits in the positioning groove 23.

[0033] In this embodiment, the end of the driving shaft 1 has threaded holes evenly distributed along the circumference of the centering hole 11; the centering shaft 2 has a flange 24 protruding radially outward along the centering sleeve 22, and the flange 24 has bolt holes corresponding to the threaded holes, and the locking mechanism is a bolt passing through the bolt hole and connected to the threaded hole.

[0034] With this embodiment of the gear clamping structure, the anti-tilt sleeve fits over the positioning post, and the anti-tilt hole at the end extends to the positioning post, allowing the cone tip to be completely within the anti-tilt hole. Furthermore, the distance from the point on the cone tip that aligns with the hole diameter to the outer end of the anti-tilt sleeve is less than the length of the end shaft section of the gear to be tested. This ensures that when the gear to be tested mates with the cone tip, the end of the anti-tilt sleeve does not interfere with the protrusion on the gear, and the inner hole of the gear to be tested reliably abuts against the cone tip. Furthermore, because the outer diameter of the anti-tilt hole matches the end diameter of the gear to be tested, the gear can be kept upright and prevented from tipping, facilitating quick alignment.

[0035] In addition, when aligning the telescopic spline centering mechanism, the spline head is slowly rotated by the drive mechanism. When the spline head contacts the internal spline of the gear, the drive shaft compresses the spring inward to prevent impact between the spline head and the internal spline. As the spline head rotates to a position that mates with the internal spline, the spring pushes the drive shaft and the internal spline out, completing the engagement of the spline head and the internal spline. This structure avoids impact between the spline head and the internal spline, preventing damage to equipment or parts while also improving spline engagement efficiency.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A telescopic spline centering mechanism, characterized in that: The invention comprises a coaxially connected drive shaft (1) and a centering shaft (2), wherein the centering shaft (2) has a coaxially arranged spring cavity (21) at one end facing the drive shaft (1), a transmission hole coaxially arranged through the bottom of the spring cavity (21), and a guide structure arranged along the axial direction on the transmission hole; a transmission shaft (3) is axially movably fitted on the transmission hole, a spring (4) is abutted between the inner end of the transmission shaft (3) and the drive shaft (1); and a spline head (5) is provided on the outer end of the transmission shaft (3) for matching with the internal spline of the gear to be measured.

2. The telescopic spline centering mechanism according to claim 1, characterized in that: The guide structure is a spline arranged on the transmission hole, and the transmission shaft (3) has an external spline matching the spline.

3. The telescopic spline centering mechanism according to claim 2, wherein: The external spline is provided inwardly and through the axial direction of the transmission shaft (3); the inner end of the transmission shaft (3) has an external retaining spring groove extending in the circumferential direction; and the external retaining spring groove is fitted with an external retaining spring baffle.

4. The telescopic spline centering mechanism according to claim 2, wherein: The external spline is provided along the axial direction of the transmission shaft (3) and extends outwards. A spline hole matching the external spline is provided coaxially on the spline head (5). The spline head (5) is detachably fitted on the external spline of the transmission shaft (3) through the spline hole.

5. The telescopic spline centering mechanism according to claim 4, characterized in that: The spline hole is provided through the spline head (5), and an end of the spline hole facing outward is provided with an inner retaining spring groove extending in the circumferential direction and is matched with an inner retaining spring retaining ring.

6. The telescopic spline centering mechanism according to claim 1, wherein: The diameter of the outward end of the spline head (5) gradually decreases and becomes a truncated cone.

7. The telescopic spline centering mechanism according to claim 1, wherein: One end of the centering shaft (2) facing the spline head (5) has a conical top connection section with a gradually decreasing diameter, wherein the maximum diameter of the top connection section is larger than the inner hole diameter of the gear to be measured, and the minimum diameter is smaller than the inner hole diameter of the gear to be measured.

8. The telescopic spline centering mechanism according to claim 1, wherein: The end of the driving shaft (1) has a coaxially arranged centering hole (11), and the diameter of the centering hole (11) gradually increases from the inside to the outside; the end of the centering shaft (2) has a centering sleeve (22) protruding toward one end of the driving shaft (1), and the outer diameter of the centering sleeve (22) gradually decreases in the direction toward the driving shaft (1), and the taper is consistent with the taper of the centering hole (11); a locking mechanism is provided between the driving shaft (1) and the centering shaft (2), so that the centering sleeve (22) is tightly and concentrically fitted in the centering hole (11).

9. The telescopic spline centering mechanism according to claim 8, wherein: The end of the centering sleeve (22) has a positioning groove (23) that is arranged to pass through in the radial direction; the centering hole (11) has a positioning block (12) that protrudes radially inward, and the width of the positioning block (12) matches the width of the positioning groove (23) and is fitted in the positioning groove (23).

10. The telescopic spline centering mechanism according to claim 8, wherein: The end of the driving shaft (1) has threaded holes uniformly distributed along the circumference of the centering hole (11); the centering shaft (2) has a flange (24) protruding outward along the radial direction of the centering sleeve (22), and the flange (24) has bolt holes corresponding to the threaded holes, and the locking mechanism is a bolt passing through the bolt hole and connected to the threaded hole.

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