Center clamping and positioning structure

Abstract

The utility model discloses a centre clamping and positioning structure, which comprises a driving shaft and a centre mechanism which are coaxially connected, the end part of the driving shaft is provided with a centering hole which is coaxially arranged, and the diameter of the centering hole is gradually increased from inside to outside; the center mechanism comprises a center body which is integrally cylindrical, one end of the center body is provided with a centering sleeve which protrudes towards the driving shaft, the outer diameter of the centering sleeve is gradually reduced in the direction away from the center body, and the taper of the centering sleeve is consistent with that of the centering hole; and a locking mechanism is arranged between the driving shaft and the centering shaft, so that the conical surface of the centering sleeve is tightly and concentrically matched with the conical surface of the centering hole. The center clamping and positioning structure has the advantages of being reasonable in structural design, convenient to disassemble and assemble, capable of achieving rapid coaxial positioning and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile component performance detection, in particular to a top clamping and positioning structure. Background Art

[0002] During the manufacturing process, the tooth surfaces of gear pairs are affected by factors such as machining and manufacturing, introducing additional errors. This causes the meshing forces to excite the gear pairs during meshing transmission, generating additional vibration noise. In traditional fuel vehicles, the noise from the engine and other components masks the noise between the gear pairs. However, in new energy electric vehicles, due to the lower operating noise of the motor itself, the gear pair noise can be extremely noticeable, seriously affecting the comfort of the entire vehicle. To this end, gear pair noise testing is required during the off-line manufacturing stage. The two ends of the gear shaft are coaxially clamped to the testing equipment via a centering mechanism. However, due to the different structural forms of the gear shafts, the centering mechanisms of different structures need to be replaced. How to coaxially position the centering mechanism has become an urgent problem that needs to be solved. 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 top clamping and positioning structure with reasonable structural design, convenient assembly and disassembly, and the ability to achieve rapid coaxial positioning.

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

[0005] A center clamping and positioning structure includes a coaxially connected drive shaft and a center mechanism, the end of the drive shaft has a coaxially arranged centering hole, and the diameter of the centering hole gradually increases from the inside to the outside; the center mechanism includes a center body that is generally cylindrical, and one end of the center body has a centering sleeve that protrudes toward the drive shaft, the outer diameter of the centering sleeve gradually decreases in the direction away from the center body, and the taper is consistent with the taper of the centering hole; a locking mechanism is provided between the drive shaft and the centering sleeve, so that the conical surface of the centering sleeve is tightly and concentrically fitted on the conical surface of the centering hole.

[0006] In the above structure, the outer conical surface of the centering sleeve cooperates with the inner conical surface of the centering hole, so that the top mechanism can be quickly and coaxially installed in the centering hole of the drive shaft.

[0007] 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.

[0008] In this way, the torque can be better transmitted through the cooperation of the positioning groove and the positioning block.

[0009] Furthermore, the end of the drive shaft has threaded holes evenly distributed along the circumference of the centering hole; the centering sleeve 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.

[0010] Furthermore, the other end of the top body has a coaxially arranged top column, and the top column has a top connection portion, the diameter of the top connection portion gradually decreases in the direction away from the top body, the minimum diameter of the top connection portion is smaller than the inner hole diameter of the gear to be measured, and the maximum diameter is larger than the inner hole diameter of the gear to be measured.

[0011] Furthermore, the top connection portion is provided with a coaxially arranged guide rod, the end of the guide rod is provided with a guide block protruding in the radial direction, and the diameter of the guide block is consistent with the inner hole diameter of the gear to be measured.

[0012] Furthermore, the diameter of the end portion of the guide block gradually decreases to be in a truncated cone shape.

[0013] Furthermore, one end of the top body facing the top column is transmission-connected with a coaxially arranged transmission sleeve, and one end of the transmission sleeve facing away from the top body is provided with an internal spline.

[0014] Furthermore, the end of the top body has threaded holes evenly distributed around the circumference of the top column; the transmission sleeve has an annular end plate at one end facing the top body, and the annular end plate has bolt holes corresponding to the threaded holes; the transmission sleeve is connected to the threaded holes of the top body by bolts passing through the bolt holes.

[0015] Furthermore, the end of the top column close to the top body has a spline shaft protruding outward, and the end of the transmission sleeve facing the top body has a spline hole matching the spline shaft.

[0016] In summary, the top clamping and positioning structure of the present invention has the advantages of reasonable structural design, convenient assembly and disassembly, and the ability to achieve rapid coaxial positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the top institution.

[0018] Figure 2 Schematic diagram of the drive shaft structure.

[0019] Figure 3 It is a schematic diagram of the decomposed structure of the drive shaft and the top mechanism.

[0020] Figure 4 This is a structural diagram of the cooperation between the top mechanism and the gear to be tested. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the embodiments.

[0022] When implementing: Figures 1 to 4 As shown, a center clamping and positioning structure includes a coaxially connected drive shaft 1 and a center mechanism 2. 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 center mechanism 2 includes a center body 21 that is generally cylindrical. One end of the center body 21 has a centering sleeve 22 that protrudes toward the drive shaft 1, and the other end has a coaxially arranged top column 25. The outer diameter of the centering sleeve 22 gradually decreases in the direction away from the center body 21, 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 sleeve 22, so that the conical surface of the centering sleeve 22 is tightly and concentrically fitted on the conical surface of the centering hole 11. The top column 25 has a top connection portion 26, and the diameter of the top connection portion 26 gradually decreases in the direction away from the center body 21. The minimum diameter of the top connection portion is smaller than the inner diameter of the gear to be measured, and the maximum diameter is larger than the inner diameter of the gear to be measured.

[0023] The end of the centering sleeve 22 has a positioning groove 23 that is arranged radially through; 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 fits in the positioning groove 23.

[0024] In the above structure, the outer conical surface of the centering sleeve cooperates with the inner conical surface of the centering hole, allowing the top mechanism to be quickly and coaxially installed in the centering hole of the drive shaft. At the same time, the cooperation between the positioning groove and the positioning block can better transmit torque.

[0025] The end of the drive shaft 1 has threaded holes uniformly distributed along the circumference of the centering hole 11. The centering sleeve 22 has a flange 24 that protrudes radially outward from the sleeve 22. The flange 24 has bolt holes corresponding to the threaded holes. The locking mechanism comprises bolts that pass through the bolt holes and connect to the threaded holes. In this embodiment, the tip body 21 protrudes relative to the centering sleeve 22 to form the flange 24.

[0026] The top connecting portion 26 has a coaxially arranged guide rod, the end of which has a guide block 28 protruding radially. The diameter of the guide block 28 is consistent with the inner diameter of the gear to be tested, and the end of the guide block 28 gradually decreases in diameter to form a truncated cone. Figure 4 As shown, the guide block on the guide rod can be matched with the inner hole of the gear to be measured to assist in alignment.

[0027] The top body 21 has one end facing the top column 25 and is connected to a coaxial transmission sleeve 27 . The transmission sleeve 27 has one end facing away from the top body 21 and is provided with an internal spline for cooperating with an external spline on the gear to be tested.

[0028] In this embodiment, the end of the top body 21 has threaded holes evenly distributed around the circumference of the top column 25; the transmission sleeve 27 has an annular end plate at one end facing the top body 21, and the annular end plate has bolt holes corresponding to the threaded holes; the transmission sleeve 27 is connected to the threaded holes of the top body 21 by bolts passing through the bolt holes.

[0029] In specific implementation, a spline can also be used to connect the transmission sleeve 27. The specific structure is: the end of the top column 25 close to the top body 21 has a spline shaft protruding outward, and the end of the transmission sleeve 27 facing the top body 21 has a spline hole that cooperates with the spline shaft.

[0030] 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 top clamping and positioning structure, characterized in that: The invention comprises a coaxially connected driving shaft (1) and a centering mechanism (2), 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 centering mechanism (2) comprises a centering body (21) which is cylindrical as a whole, and one end of the centering body (21) has a centering sleeve (22) which is protruded toward the driving shaft (1), and the outer diameter of the centering sleeve (22) gradually decreases in a direction away from the centering body (21), 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 sleeve (22), so that the conical surface of the centering sleeve (22) is tightly and concentrically fitted on the conical surface of the centering hole (11).

2. The top clamping and positioning structure according to claim 1, characterized in that: 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).

3. The top clamping and positioning structure according to claim 1, characterized in that: The end of the drive shaft (1) has threaded holes uniformly distributed along the circumference of the centering hole (11); the centering sleeve (22) has a flange (24) protruding outward along the radial direction of the centering sleeve (22); 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.

4. The top clamping and positioning structure according to any one of claims 1 to 3, characterized in that: The other end of the top body (21) has a coaxially arranged top column (25), and the top column (25) has a top connection portion (26). The diameter of the top connection portion (26) gradually decreases in a direction away from the top body (21), and the minimum diameter of the top connection portion is smaller than the inner hole diameter of the gear to be measured, and the maximum diameter is larger than the inner hole diameter of the gear to be measured.

5. The top clamping and positioning structure according to claim 4, characterized in that: The top connection portion (26) is provided with a coaxially arranged guide rod, the end of the guide rod is provided with a guide block protruding in the radial direction, and the diameter of the guide block is consistent with the inner hole diameter of the gear to be measured.

6. The top clamping and positioning structure according to claim 5, characterized in that: The diameter of the end portion of the guide block gradually decreases and becomes a truncated cone.

7. The top clamping and positioning structure according to claim 4, characterized in that: One end of the top body (21) facing the top column (25) is transmission-connected to a coaxially arranged transmission sleeve (27), and one end of the transmission sleeve (27) facing away from the top body (21) is provided with an internal spline.

8. The top clamping and positioning structure according to claim 7, characterized in that: The end of the top body (21) has threaded holes uniformly distributed around the circumference of the top column (25); the end of the transmission sleeve (27) facing the top body (21) has an annular end plate, and the annular end plate has bolt holes corresponding to the threaded holes; the transmission sleeve (27) is connected to the threaded holes of the top body (21) by bolts passing through the bolt holes.

9. The top clamping and positioning structure according to claim 7, characterized in that: The top column (25) has a spline shaft protruding outward at one end close to the top body (21), and the transmission sleeve (27) has a spline hole matched with the spline shaft at one end facing the top body (21).

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