Tool for evaluating service life of intermediate shaft drawn cup needle bearing shell

Abstract

The utility model relates to the technical field of machinery, in particular to a tool for evaluating the service life of an intermediate shaft punched outer ring needle bearing shell, which comprises a bottom plate, a back plate, a connecting plate, a pressing block, a rotating shaft, a connecting column and a fastener, the upper end of the connecting column is connected with the bottom of the bottom plate, and a protruding supporting plane is arranged at one end of the top of the bottom plate. The other end of the top of the bottom plate is connected with the bottom of the back plate through a rotating shaft, the bottom plate and the back plate are fixed through a fourth fastener, a connecting plate is installed on the top of the back plate, the first fastener is in threaded connection with the center of the connecting plate, and a pressing block is installed at the bottom of the first fastener and located in a notch in the surface of the back plate. Compared with the prior art, the assembly and bearing of the needle bearing and an opponent piece yoke are realized through the back plate and the bottom plate, and the shell of the needle bearing is extruded by the bottom plate in the radial direction, so that a part is tested under the working condition of use, residual stress exists in the part, the subsequent influence on the calculation of the service life of the shell is reduced, and the subsequent calculation difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically a tooling for evaluating the life of the outer ring needle roller bearing housing for intermediate shaft stamping. Background Technology

[0002] In the automotive industry, needle roller bearings are widely used due to their small size and strong radial load capacity, and intermediate shafts are one of their application scenarios.

[0003] See Figure 1 Needle roller bearings typically consist of a housing (1) and needle rollers (2). They function as load-bearing and transmission components within an intermediate shaft, and are also considered safety parts. Due to the significant forces they bear, needle roller bearing housing cracking is a common occurrence in the industry, potentially leading to serious consequences such as abnormal steering noises or even steering failure in vehicles. Therefore, assessing the lifespan of needle roller bearings is a crucial task.

[0004] Currently, the radial load life calculation of needle rollers is very mature. However, the calculation of shell life is difficult and prone to error because it needs to consider the complex stress conditions, residual stress, and average stress.

[0005] Therefore, it is necessary to design a tooling for evaluating the life of the outer ring needle roller bearing housing of the intermediate shaft stamping, so as to realize the assembly and load-bearing of the needle roller bearing and the hand parts, conduct tests under the service conditions of the parts, and reduce the impact of residual stress on subsequent life calculations. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tooling for evaluating the life of the outer ring of a needle roller bearing for intermediate shaft stamping, so as to realize the assembly and load-bearing of the needle roller bearing and the hand parts, conduct tests under the working conditions of the parts, and reduce the impact of residual stress on subsequent life calculations.

[0007] To achieve the above objectives, this utility model is a tooling for calculating the life of the outer ring of a needle roller bearing for intermediate shaft stamping. It includes a base plate, a back plate, a connecting plate, a pressure block, a rotating shaft, a connecting column, and fasteners. The upper end of the connecting column is connected to the bottom of the base plate. One top end of the base plate has a protruding support plane. The other top end of the base plate is connected to the bottom of the back plate by a rotating shaft. The base plate and the back plate are fixed together by four fasteners. The included angle between the base plate and the back plate is 90°. A connecting plate is installed on the top of the back plate. Fastener one is threaded to the center of the connecting plate. A pressure block is installed at the bottom of fastener one. The pressure block is located within a notch on the surface of the back plate. The fork shaft is placed within the notch of the back plate. The bottom of the pressure block abuts against the upper surface of the fork shaft. The bottom surface of the fork shaft is tightly fitted with the support plane. The support plane abuts against the bottom surface of the needle roller bearing. A gap is provided between the intermediate shaft bolt and the surface of the base plate.

[0008] A threaded gasket is provided between the connecting column and the base plate.

[0009] The supporting force of the supporting plane on the housing of the needle roller bearing is ≤100N.

[0010] The lower end of the connecting column is connected to the SN test equipment.

[0011] The back plate and the fork shaft are connected by a three-way fastener connection.

[0012] The back plate and the connecting plate are connected by two fasteners.

[0013] The preload of fastener 1, fastener 2, fastener 3, and fastener 4 shall be at least 10 kN.

[0014] Strain gauges are attached to the bottom surface of the needle roller bearing.

[0015] Compared with the prior art, this utility model achieves connection with the SN test equipment through the connecting column, and realizes the assembly and bearing of the needle roller bearing and the hand joint fork through the back plate and the bottom plate. The housing of the needle roller bearing is radially squeezed by the bottom plate, so that the part is tested under the use condition. The residual stress exists in the part, which reduces the impact on the subsequent housing life calculation and reduces the difficulty of subsequent calculation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a needle roller bearing.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model.

[0018] Figure 3 This is the front view of the present invention.

[0019] Figure 4 This is a side view of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation of the strain gauge of this utility model. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] See Figure 2 , Figure 3 and Figure 4This utility model is a tooling for evaluating the life of the outer ring needle roller bearing housing of an intermediate shaft stamping process. It includes a base plate, a back plate, a connecting plate, a pressure block, a rotating shaft, a connecting column, and fasteners. The upper end of the connecting column 6 is connected to the bottom of the base plate 7. One top end of the base plate 7 has a protruding support plane 71. The other top end of the base plate 7 is connected to the bottom of the back plate 5 by a rotating shaft 9. The base plate 7 and the back plate 5 are fixed together by fasteners 44. The included angle between the base plate 7 and the back plate 5 is 90°. The back plate 5... A connecting plate 10 is installed on the top of the plate. Fastener 41 is threaded to the center of the connecting plate 10. A pressure block 11 is installed at the bottom of the fastener 41. The pressure block 11 is located in the notch on the surface of the back plate 5. The fork shaft 34 is placed in the notch on the back plate 5. The bottom of the pressure block 11 abuts against the upper surface of the fork shaft 34. The bottom surface of the fork 31 is in close contact with the support plane 71. The support plane 71 abuts against the bottom surface of the needle roller bearing 32. There is a gap between the intermediate shaft bolt 33 and the surface of the base plate 7.

[0023] A threaded washer 8 is provided between the connecting column 6 and the base plate 7 to adjust the height of the base plate 7 and ensure that the position is suitable.

[0024] The lower end of the connecting column 6 is connected to the SN test equipment.

[0025] The back plate 5 is connected to the fork shaft 34 using fastener 3 43. The back plate 5 is connected to the connecting plate 10 using two fasteners 2 42 to ensure the overall rigidity of the tooling.

[0026] The preload of fasteners 1 (41), 2 (42), 3 (43), and 44 (44) shall be at least 10 kN to reduce errors.

[0027] See Figure 5 Strain gauges 12 are attached to the bottom surface of the needle roller bearing 32.

[0028] The fork 31, needle roller bearing 32, intermediate shaft bolt 33, and fork shaft 34 are components of the intermediate shaft. During the SN test, the main load is applied to the housing of the needle roller bearing 32.

[0029] This utility model uses 45# steel as the main material, which is similar to the material of the fork 31, further reducing the error.

[0030] The intermediate shaft should preferably use the extreme sample that is most detrimental to its lifespan, followed by the non-extreme sample. In both cases, the dimensions of the relevant parts that affect the lifespan should be inspected and archived for future use.

[0031] The machining accuracy of this tooling is within 0.01, reducing errors. The angle between the base plate and the back plate is adjustable, enabling different ways of fixing parts. The direction of force application can be adjusted as needed.

[0032] In this invention, during intermediate shaft installation, the tightness of the fit between the bottom surface of the fork 31 and the supporting plane 71 can be adjusted by adjusting fastener 41. The supporting plane 71 provides support for the needle roller bearing 32, preventing changes in its position. The supporting force of the supporting plane 71 on the housing of the needle roller bearing 32 is ≤100N, preventing changes in the load effect. Testing is conducted using actual parts in operating conditions, reducing the difficulty of stress analysis.

[0033] This invention uses actual parts instead of sheet metal. The bearing housing is already under radial compression, which is closer to the working condition. Residual stress exists in the parts, so there is no need to consider the influence of residual stress separately in subsequent simulation calculations. This avoids complex stress analysis and simulation transformation, and reduces the simulation difficulty.

[0034] This invention connects to the SN testing equipment via a connecting column, and assembles and supports the needle roller bearing and the handpiece fork via a back plate and a bottom plate. The housing of the needle roller bearing is radially compressed by the bottom plate, allowing the parts to be tested under operating conditions. Residual stress exists in the parts, reducing the impact on subsequent housing life calculations and lowering the difficulty of subsequent calculations.

Claims

1. A tooling for evaluating the life of a needle roller bearing housing with an outer ring stamped on an intermediate shaft, comprising a base plate, a back plate, a connecting plate, a pressure block, a rotating shaft, a connecting column, and fasteners, characterized in that: The upper end of the connecting column (6) is connected to the bottom of the base plate (7). One end of the top of the base plate (7) has a protruding support plane (71). The other end of the top of the base plate (7) is connected to the bottom of the back plate (5) by a pivot (9). The base plate (7) and the back plate (5) are fixed by fastener four (44). The included angle between the base plate (7) and the back plate (5) is 90°. A connecting plate (10) is installed on the top of the back plate (5). Fastener one (41) is connected to the center of the connecting plate (10). The fastener (41) is connected by a thread and a pressure block (11) is installed at the bottom. The pressure block (11) is located in the notch on the surface of the back plate (5). The fork shaft (34) is placed in the notch on the back plate (5). The bottom of the pressure block (11) abuts against the upper surface of the fork shaft (34). The bottom surface of the fork (31) is in close contact with the support plane (71). The support plane (71) abuts against the bottom surface of the needle roller bearing (32). There is a gap between the intermediate shaft bolt (33) and the surface of the base plate (7).

2. The tooling for evaluating the life of a needle roller bearing housing for intermediate shaft stamping as described in claim 1, characterized in that: A threaded gasket (8) is provided between the connecting column (6) and the base plate (7).

3. The tooling for evaluating the life of a needle roller bearing housing with an outer ring stamped on an intermediate shaft according to claim 1, characterized in that: The supporting force of the supporting plane (71) on the housing of the needle roller bearing (32) is ≤100N.

4. The tooling for evaluating the life of a needle roller bearing housing for intermediate shaft stamping as described in claim 1, characterized in that: The lower end of the connecting column (6) is connected to the SN test equipment.

5. The tooling for evaluating the life of a needle roller bearing housing for intermediate shaft stamping as described in claim 1, characterized in that: The back plate (5) and the fork shaft (34) are connected by fastener three (43).

6. The tooling for evaluating the life of a needle roller bearing housing for intermediate shaft stamping as described in claim 1, characterized in that: The back plate (5) and the connecting plate (10) are connected by two fasteners (42).

7. A tooling for evaluating the life of a needle roller bearing housing with an outer ring stamped on an intermediate shaft, as described in claim 1, 5, or 6, characterized in that: The preload of fastener 1 (41), fastener 2 (42), fastener 3 (43), and fastener 4 (44) is at least 10 kN.

8. The tooling for evaluating the life of a needle roller bearing housing for intermediate shaft stamping as described in claim 1, characterized in that: The bottom surface of the needle roller bearing (32) is attached with a strain gauge (12).

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