Flexible joint test tool capable of eliminating concentric error

Abstract

The utility model relates to the technical field of running-in test tools, in particular to a flexible joint test tool capable of eliminating concentric errors. The tool comprises a tool body which is hollow inside, the tool body is arranged in an L shape, one end of the tool body is connected with an assembly input end through a mounting disc, and the other end of the tool body is connected with a test bed through a connecting spigot; the tool body comprises a positioning spigot, a spline housing and a flexible joint, the flexible joint is located in the positioning spigot, and the flexible joint is arranged in a hollow column shape; a motor shaft at the input end of the assembly extends to the flexible joint from the mounting disc, and the spline housing extends to a conical hole of the flexible joint from the middle part of the tool body; and the motor shaft and the spline housing are concentrically arranged through the flexible joint. According to the utility model, the motor shaft and the spline housing are concentrically arranged indirectly through the flexible joint, so that the rigid contact between the motor shaft and the spline housing is avoided, the occurrence of collision damage is fundamentally prevented, and the spline housing with higher cost is protected.

Description

Technical Field

[0001] This utility model relates to the field of break-in test fixture technology, specifically to a flexible joint test fixture that can eliminate concentricity error. Background Technology

[0002] In the break-in tests of the transmission assembly, transfer case assembly, and rear axle assembly, the conventional testing method uses a high-precision hard-connection spline sleeve. One end of this spline sleeve is fixed to the test bench with bolts and a stop, while the other end connects to the assembly input end. Due to its high machining precision requirements and strict tolerances, its manufacturing cost is relatively high. If the positioning stop and the connecting spline are not concentric, abnormal noise will be generated during the test, interfering with the accurate judgment of abnormal noise in the assembly and creating a false noise pattern. To solve the above problems, those skilled in the art have made many attempts. For example, Chinese patent publication number CN219529625U discloses a universal test shaft for internal spline motors, realizing the universality of test shafts for internal spline motors of different standards. However, the hard-connection spline sleeve of this solution is usually made of 45 steel and includes components such as a return spring and a rear outer sleeve, which has limitations in achieving concentricity and cannot fundamentally avoid impact damage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a flexible joint testing fixture that can eliminate concentricity error.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A flexible joint testing fixture capable of eliminating concentricity error includes a hollow fixture body in an L-shape. One end of the fixture body is connected to the assembly input end via a mounting plate, and the other end is connected to a test bench via a connecting stop. The fixture body includes a positioning stop, a spline sleeve, and a flexible joint. The flexible joint is located within the positioning stop and is a hollow cylindrical shape. The motor shaft at the assembly input end extends from the mounting plate to the flexible joint, and the spline sleeve extends from the middle of the fixture body to the tapered hole of the flexible joint. The motor shaft is concentrically positioned with the spline sleeve via the flexible joint.

[0006] The tool body of the technical scheme can reliably realize power transmission under the eccentricity between the spline sleeve and the assembly input end, reduce vibration and noise in the transmission process, and improve the stability of the mechanical transmission system. The polyurethane rod is used as the soft joint, which has good buffering performance, can effectively avoid the collision between the motor shaft and the spline sleeve, reduce the wear and damage of the parts, and prolong the service life of the equipment. The connection mode of the soft joint with the motor shaft and the spline sleeve is simple and easy to operate, and the bolt fixing and the taper hole interference fit are convenient for installation and disassembly, and improve the work efficiency. The L-shaped setting of the tool body and the reasonable design of the internal channel make the whole tool structure compact and reasonable in layout, which can adapt to different installation environments and transmission requirements.

[0007] In addition, the soft joint test tool capable of eliminating concentricity error according to the utility model can have the following additional technical features:

[0008] According to an embodiment of the utility model, the left side of the soft joint is fixedly installed at the end of the motor shaft through a bolt, and the right side of the soft joint is interference-fitted at the end of the spline sleeve through a taper hole.

[0009] In the technical scheme, the bolt fixing connection can accurately position the soft joint at the end of the motor shaft, so that the axis of the soft joint is highly consistent with the axis of the motor shaft; the taper hole plays a guiding role during interference fitting, and the shape of the taper hole enables the end of the spline sleeve to automatically adjust the position during insertion, gradually aligning with the axis of the soft joint, which helps to quickly align the spline sleeve with the assembly input end.

[0010] According to an embodiment of the utility model, the taper hole of the soft joint is provided with an inclined contact surface matched with the end of the spline sleeve.

[0011] In the technical scheme, the setting of the inclined contact surface increases the contact area between the taper hole of the soft joint and the end of the spline sleeve; prevents relative sliding or loosening between the spline sleeve and the soft joint due to factors such as vibration and torque change during operation of the motor shaft, and ensures the stability of power transmission.

[0012] According to an embodiment of the utility model, the tool body is provided with a spline sleeve fixing channel, and the fixing channel and the positioning stop are connected by a connecting channel of the soft joint.

[0013] In the technical scheme, the connecting channel of the soft joint is between the fixing channel and the positioning stop, and serves as a bridge connecting the motor shaft and the spline sleeve, so that the power of the motor shaft can be reliably transmitted to the spline sleeve through the soft joint.

[0014] According to an embodiment of the utility model, the soft joint part extends to the end of the motor shaft in the direction of the positioning stop.

[0015] In the technical solution, the soft joint does not need to be processed with splines, and the elasticity of the soft joint automatically adjusts the contact state of the soft joint with the motor shaft, thereby playing a certain correction role and maintaining relatively good concentricity between the spline sleeve and the motor shaft.

[0016] According to one embodiment of the utility model, the soft joint is a polyurethane rod to avoid the motor shaft from bumping the spline sleeve.

[0017] In the technical solution, the polyurethane rod serves as the soft joint, and the soft material property of the polyurethane rod can form an isolation layer between the motor shaft and the spline sleeve to avoid direct rigid contact between the two, thereby fundamentally preventing bumping damage from occurring and protecting the spline sleeve with a relatively high cost. When the soft joint needs to be replaced due to wear, the old soft joint can be removed from the connecting channel, and a new soft joint can be installed, thereby greatly shortening the maintenance time and cost.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The soft joint made of a polyurethane rod is added to the tool body, the motor shaft and the spline sleeve are indirectly concentrically arranged through the soft joint, direct rigid contact between the motor shaft and the spline sleeve is avoided, bumping damage is fundamentally prevented from occurring, the spline sleeve with a relatively high cost is protected, and the requirements of the off-line running-in test of the gearbox assembly, the transfer case assembly, and the rear axle assembly are met. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the structural schematic view of the utility model.

[0021] Figure 2 is the structural schematic view of the tool body.

[0022] In the drawing: 1, tool body; 11, positioning stop; 12, spline sleeve; 13, soft joint; 14, tapered hole; 2, mounting disc; 3, connecting stop; 4, motor shaft. DETAILED DESCRIPTION

[0023] 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 part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Embodiment 1

[0025] As Figure 1 and Figure 2As shown, the embodiment provides a soft joint test tool capable of eliminating concentric error, which comprises an internally hollow tool body 1, the tool body 1 is arranged in an L shape, one end of the tool body 1 is connected with an assembly input end through a mounting disc 2, the other end of the tool body 1 is connected with a test bench through a connecting stop 3; the tool body 1 comprises a positioning stop 11, a spline sleeve 12 and a soft joint 13, the soft joint 13 is located in the positioning stop 11, and the soft joint 13 is arranged in a hollow column shape; a motor shaft 4 of the assembly input end extends from the mounting disc 2 to the soft joint 13, and the spline sleeve 12 extends from the middle of the tool body 1 to a tapered hole 14 of the soft joint 13; the motor shaft 4 is concentrically arranged with the spline sleeve 12 through the soft joint 13.

[0026] As shown in Figure 1 and Figure 2 The tool body 1 of the technical solution can reliably realize power transmission under the eccentricity condition of the spline sleeve 12 and the assembly input end through the soft joint 13, reduce vibration and noise in the transmission process, and improve the stability of the mechanical transmission system. The polyurethane rod is used as the soft joint 13, which has good buffering performance, can effectively avoid the knocking between the motor shaft 4 and the spline sleeve 12, reduce the wear and damage of the parts, and prolong the service life of the equipment. The connection mode of the soft joint 13 and the motor shaft 4 and the spline sleeve 12 is simple and easy to operate, and the soft joint 13 is fixed through bolt fixing and interference fit of the tapered hole 14, which is convenient for installation and disassembly, and improves the work efficiency. The L-shaped arrangement of the tool body 1 and the reasonable design of the internal passage make the whole tool structure compact and the layout reasonable, which can adapt to different installation environments and transmission requirements.

[0027] In addition, the soft joint test tool capable of eliminating concentric error according to the above-mentioned technical solution of the utility model can also have the following additional technical features:

[0028] According to one embodiment of the utility model, the left side of the soft joint 13 is fixedly installed at the end of the motor shaft 4 through a bolt, and the right side of the soft joint 13 is interference-fitted at the end of the spline sleeve 12 through a tapered hole 14.

[0029] In the technical solution, the bolt fixing connection can accurately position the soft joint 13 at the end of the motor shaft 4, so that the axis of the soft joint 13 is highly consistent with the axis of the motor shaft 4; the tapered hole 14 plays a guiding role when interference fitting, and the shape of the tapered hole 14 enables the end of the spline sleeve 12 to automatically adjust the position during the insertion process, gradually aligning with the axis of the soft joint 13, which helps to realize the rapid alignment of the spline sleeve 12 and the assembly input end.

[0030] According to one embodiment of the utility model, the tapered hole 14 of the soft joint 13 is provided with an inclined contact surface matched with the end of the spline sleeve 12.

[0031] In the technical solution, the inclined contact surface increases the contact area between the tapered hole 14 of the flexible joint 13 and the end of the spline sleeve 12, prevents relative sliding or loosening between the spline sleeve 12 and the flexible joint 13 due to vibration, torque change and other factors during operation of the motor shaft 4, and ensures the stability of power transmission.

[0032] According to an embodiment of the utility model, the tool body 1 is provided with a fixing channel of the spline sleeve 12, and the fixing channel and the positioning stop 11 are connected by the connecting channel of the flexible joint 13.

[0033] In the technical solution, the connecting channel of the flexible joint 13 is between the fixing channel and the positioning stop 11, serves as a bridge connecting the motor shaft 4 and the spline sleeve 12, and enables the power of the motor shaft 4 to be reliably transmitted to the spline sleeve 12 through the flexible joint 13.

[0034] According to an embodiment of the utility model, the flexible joint 13 partially extends out of the connecting channel and extends to the end of the motor shaft 4 in the direction of the positioning stop 11.

[0035] In the technical solution, the flexible joint 13 does not need to be processed with splines, and the elasticity of the flexible joint 13 automatically adjusts the contact state of the flexible joint 13 and the motor shaft 4, plays a certain correction role, and maintains relatively good concentricity between the spline sleeve 12 and the motor shaft 4.

[0036] According to an embodiment of the utility model, the flexible joint 13 is a polyurethane rod to avoid the motor shaft 4 from colliding with the spline sleeve 12.

[0037] In the technical solution, the polyurethane rod serves as the flexible joint 13, and the soft material characteristics of the polyurethane rod can form an isolation layer between the motor shaft 4 and the spline sleeve 12, avoid direct rigid contact between the motor shaft 4 and the spline sleeve 12, fundamentally prevent collision damage from occurring, and protect the spline sleeve 12 with a relatively high cost. When the flexible joint 13 needs to be replaced due to wear, the old flexible joint 13 can be taken out from the connecting channel, and a new flexible joint 13 can be installed, so that the maintenance time and cost are greatly shortened.

[0038] The use process of the above embodiment is as follows:

[0039] As Figure 1 and Figure 2As shown, during installation, one end of the tool body 1 is connected to the input end of the assembly through the mounting disc 2, and the other end is connected to the test bench through the connecting stop 3; the left side of the soft joint 13 made of a polyurethane rod is fixed on the end of the motor shaft 4 by a bolt, ensuring that the soft joint 13 is coaxial with the motor shaft 4; then, the spline sleeve 12 is inserted into the middle of the tool body 1, and the end of the spline sleeve 12 enters the tapered hole 14 of the soft joint 13; the inclined contact surface of the tapered hole 14 guides the spline sleeve 12 to automatically adjust the position during insertion, aligning with the axis of the soft joint 13, and achieving the coaxial arrangement of the spline sleeve 12 and the motor shaft 4;

[0040] When the gearbox assembly, transfer case assembly, and rear axle assembly are subjected to the off-line running-in test, the motor shaft 4 rotates, and the power is transmitted to the spline sleeve 12 through the soft joint 13; the soft joint 13, by virtue of its elasticity, on the one hand, buffers the vibration and impact of the motor shaft 4, reduces the transmission vibration and noise, and improves the system stability; on the other hand, its elasticity can automatically adjust the contact state with the motor shaft 4, maintaining the concentricity; at the same time, the soft joint 13 isolates the motor shaft 4 and the spline sleeve 12, avoiding rigid contact and knocking between the two, and reducing wear;

[0041] If the soft joint 13 is worn out, it only needs to be removed from the connecting channel, and a new soft joint 13 is replaced, which is simple to operate, saves time and cost.

[0042] Although the utility model is described in detail by referring to the attached drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model, and these modifications or replacements should be within the scope of the utility model. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A soft joint test fixture that eliminates concentricity errors, characterized by, The utility model provides a test fixture for the motor shaft, which comprises an internally hollow tool body (1), wherein the tool body (1) is arranged in an L shape, one end of the tool body (1) is connected to an assembly input end through a mounting disc (2), and the other end of the tool body (1) is connected to a test bench through a connecting socket (3); the tool body (1) comprises a positioning socket (11), a spline sleeve (12) and a flexible joint (13), the flexible joint (13) is arranged in the positioning socket (11), and the flexible joint (13) is arranged in a hollow columnar shape; a motor shaft (4) of the assembly input end extends from the mounting disc (2) to the flexible joint (13), and the spline sleeve (12) extends from the middle of the tool body (1) to a tapered hole (14) of the flexible joint (13); the motor shaft (4) is coaxially arranged with the spline sleeve (12) through the flexible joint (13).

2. The soft joint test fixture of claim 1, wherein, The left side of the flexible joint (13) is fixedly installed at the end of the motor shaft (4) through a bolt, and the right side of the flexible joint (13) is in interference fit with the end of the spline sleeve (12) through the tapered hole (14).

3. The soft joint test fixture of claim 1, wherein, The tapered hole (14) of the flexible joint (13) is provided with an inclined contact surface matched with the end of the spline sleeve (12).

4. The soft joint test fixture of claim 1, wherein, The tool body (1) is provided with a fixing channel of the spline sleeve (12), and the fixing channel and the positioning socket (11) are connected through a connecting channel of the flexible joint (13).

5. The soft joint test fixture of claim 4, wherein the soft joint test fixture is configured to eliminate concentricity errors by, The flexible joint (13) partially leaks out of the connecting channel and extends to the end of the motor shaft (4) in the direction of the positioning socket (11).

6. The soft joint test fixture of claims 1 or 5, wherein, The flexible joint (13) is a polyurethane rod, which can avoid the motor shaft (4) from colliding with the spline sleeve (12).

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