Torsional rigidity testing device for steering column

Abstract

The utility model relates to the technical field of steering systems, in particular to a device for testing the torsional rigidity of a steering column. A steering column torsional rigidity testing device comprises a rack stand column, a fixed vertical plate and a bottom plate, and is characterized in that the bottom plate is fixedly connected with the rack stand column, the rack stand column is connected with the fixed vertical plate through a lead screw sliding block assembly, the front side of the fixed vertical plate is connected with a product clamp through a sliding rail, and an aligning and centering assembly is arranged on the lower side of the front of the fixed vertical plate 3. Compared with the prior art, the torsional rigidity testing device for the steering column is simple to operate, flexible to adjust, compact, firm, convenient and practical, and rigidity difference caused by non-concentricity during mounting and carrying is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, in particular to a device for testing the torsional rigidity of a steering column. Background Art

[0002] The car steering column is connected to the steering wheel at the top and the steering gear at the bottom. It plays a connecting role and is a control mechanism component in the steering system. It is used to transmit torque and absorb energy during accidental collisions to protect the driver's safety.

[0003] During the steering process of a car, the steering mechanism is operated. Due to factors such as tires, air pressure, road conditions, front axle load, steering angle, system stiffness, etc., the wheels rub against the ground and produce damping. The torsional stiffness performance of the steering column directly affects the safety, handling stability and driving comfort of the car. It plays a vital role in ensuring vehicle driving safety, reducing traffic accidents, protecting the driver's personal safety, and improving driving conditions.

[0004] The torsional stiffness of the steering column, in simple terms, refers to the ability of the steering shaft system to resist damping and undergo elastic deformation when the steering wheel of the car is turned. The torsional stiffness of the steering column is related to the safety characteristics of the vehicle's handling, and its minimum torsional stiffness must be controlled within a certain range. Steering column manufacturers must conduct torsional stiffness tests in the early stages of product development, and based on this, this test device was designed and manufactured. Summary of the invention

[0005] The utility model overcomes the deficiencies of the prior art and provides a steering column torsional stiffness testing device, which is simple to operate, flexible to adjust, firm and reliable, convenient and practical, and eliminates the stiffness difference caused by eccentricity during installation and mounting.

[0006] In order to achieve the above purpose, a steering column torsional stiffness test device is designed, which includes a bench column, a fixed vertical plate, and a bottom plate, and is characterized in that: the bottom plate is fixedly connected to the bench column, the bench column is connected to the fixed vertical plate through a screw slider assembly, the front side of the fixed vertical plate is connected to the product fixture through a slide rail, and a centering assembly is provided on the front lower side of the fixed vertical plate 3;

[0007] The self-aligning and centering assembly comprises a hand crank handle, a bevel gear, a screw assembly, a Z-axis movable plate, a Y-axis movable guide rail, and a fixed flange. The screw assembly is connected to the back of the fixed vertical plate through a connecting piece; the top axis of the first screw of the screw assembly is connected to bevel gear one, bevel gear one is meshed and connected to bevel gear two, and bevel gear two is connected to the hand crank handle through a rotating shaft; the screw nut of the screw assembly is connected to the Z-axis movable plate through a connecting piece, and the two sides of the bottom of the Z-axis movable plate are respectively connected to the Y-axis movable guide rails, the Y-axis movable guide rail is slidably connected to the Y-axis movable plate, and the top of the Y-axis movable plate is connected to the fixed flange through a connecting piece.

[0008] A rotating hand wheel is arranged on the top of the stand column, the bottom of the rotating hand wheel is connected to a second lead screw, the second lead screw is connected to a slider assembly, and the slider assembly is connected to one side of the fixed vertical plate.

[0009] There are at least two product fixtures, and the bottom of the product fixture is slidably connected to the slide rail, and the slide rail is embedded in the fixed vertical plate.

[0010] The Z-axis movable plate is located at the lower front side of the fixed vertical plate.

[0011] The fixed flange is located above the Z-axis moving plate, and the output shaft clamping tooling is connected to the fixed flange.

[0012] A guide rail limit stopper is provided at the front end of the Y-direction movable guide rail.

[0013] The two sides of the rear part of the Z-axis moving plate are respectively connected to the Z-direction moving guide rails through the slider assemblies, and the Z-direction moving guide rails are fixedly connected to the front side of the fixed vertical plate.

[0014] Compared with the prior art, the utility model provides a steering column torsional stiffness testing device, which is simple to operate, flexible to adjust, firm and reliable, convenient and practical, and eliminates the stiffness difference caused by eccentricity during installation and mounting.

[0015] The device is used for testing the torsional stiffness of pipe strings, greatly improving test efficiency and accuracy, and providing direction for product problem analysis and design verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the structure of the utility model.

[0017] Figure 2 It is the front view of the structure of the utility model.

[0018] Figure 3 , Figure 4 It is a side view of the centering assembly of the utility model.

[0019] Figure 5 It is a schematic diagram of the use status of the structure of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below with reference to the accompanying drawings.

[0021] Traditional torsional stiffness test benches are all fixed to the test drive (steering wheel torque and angle) end on the bench column, and the load end (output shaft device) is fixed to the bench column. At the initial stage of bench setting, it is adjusted to one axis, and the sample is directly installed for testing. The disadvantage of this is that with long-term use, the tooling wear caused by the torque loading process, or the loosening and deflection of the fixed points of the drive and load ends relative to the bench column will cause the input and output ends to be non-concentric, affecting the stiffness test accuracy.

[0022] In order to improve the test capability and test accuracy, this device is designed to replace the original test bench. The tooling is positioned according to the product itself. The product fixture and the output end are fixed on a vertical plate. The output end shaft clamping tooling is adjusted and fixed by a lead screw and a movable slide rail to always ensure that the column output end is concentric with the column steering shaft. The test steering wheel (including torque and angle sensors) is driven and installed on the column head. The test steering wheel is freely mounted and is not affected by the boundary. Always ensure that the test end of the column steering shaft head is concentric with the steering shaft output end (rigidly fixed by the shaft clamping tooling).

[0023] Since the torsional stiffness of the column refers to the torsional stiffness of the column steering drive shaft, the output end of the column drive shaft must be rigidly locked during testing. Based on this, the device of the utility model is designed.

[0024] like Figures 1 to 4 As shown, the base plate 1 is fixedly connected to the stand column 2, the stand column 2 is connected to the fixed stand plate 3 through a screw slider assembly, the front side of the fixed stand plate 3 is connected to the product fixture 4 through a slide rail 7, and a centering assembly 6 is provided on the front lower side of the fixed stand plate 3;

[0025] The self-aligning and centering component 6 includes a hand crank handle, a bevel gear, a screw assembly, a Z-axis movable plate, a Y-axis movable guide rail, and a fixed flange. The screw assembly is connected to the back of the fixed vertical plate 3 through a connecting piece; the top axis of the first screw 6-7 of the screw assembly is connected to the bevel gear one 6-9, the bevel gear one 6-9 is meshed and connected to the bevel gear two 6-10, and the bevel gear two 6-10 is connected to the hand crank handle 6-12 through the rotating shaft 6-11; the screw nut 6-8 of the screw assembly is connected to the Z-axis movable plate 6-1 through a connecting piece, and the two sides of the bottom of the Z-axis movable plate 6-1 are respectively connected to the Y-axis movable guide rails 6-3, the Y-axis movable guide rail 6-3 is slidably connected to the Y-axis movable plate 6-6, and the top of the Y-axis movable plate 6-6 is connected to the fixed flange 6-2 through a connecting piece.

[0026] A rotating hand wheel 2 - 1 is provided on the top of the stand column 2 , the bottom of the rotating hand wheel 2 - 1 is connected to a second lead screw 2 - 2 , the second lead screw 2 - 2 is connected to a slider assembly 2 - 3 , and the slider assembly 2 - 3 is connected to one side of the fixed vertical plate 3 .

[0027] At least two product fixtures 4 are provided, and the bottom of the product fixture 4 is slidably connected to a slide rail 7 , and the slide rail 7 is embedded in the fixed vertical plate 3 .

[0028] The Z-axis moving plate 6 - 1 is located at a lower front side of the fixed vertical plate 3 .

[0029] The fixed flange 6-2 is located above the Z-axis moving plate 6-1, and the output shaft clamping tooling 8 is connected to the fixed flange 6-2.

[0030] A guide rail limit stopper 6-4 is provided at the front end of the Y-direction movable guide rail 6-3.

[0031] The two sides of the rear part of the Z-axis movable plate 6 - 1 are respectively connected to the Z-direction movable guide rails 6 - 13 through slider assemblies, and the Z-direction movable guide rails 6 - 13 are fixedly connected to the front side of the fixed vertical plate 3 .

[0032] Since the torsional stiffness of the column refers to the torsional stiffness of the column steering drive shaft, the output end of the column drive shaft must be rigidly locked during testing. Based on this, the device is designed and manufactured.

[0033] like Figure 5 As shown, the steering column to be tested is installed on the fixed vertical plate 3 through the product fixture 4, the output end of the column transmission shaft is rigidly fixed, and the input end of the column transmission shaft is connected to the test steering wheel (the steering wheel has built-in torque and angle sensors). A certain rotation torque is input to the steering column shaft along the tangent direction of the steering wheel rim, and the column input torque and angle signal are recorded. By calculating the slope K value of the two, the torsional stiffness of the steering column is obtained.

[0034] Compared with the existing test bench, the utility model is simple to operate, flexible to adjust, firm and reliable, convenient and practical, and eliminates the stiffness difference caused by non-concentricity during installation. The device is used for the torsional stiffness test of the pipe column, greatly improving the test efficiency and test accuracy, and pointing out the direction for product problem analysis and design verification.

Claims

1. A device for testing the torsional stiffness of a steering column, comprising a stand column, a fixed plate, and a bottom plate, characterized in that: The base plate (1) is fixedly connected to a stand column (2), the stand column (2) is connected to a fixed stand plate (3) via a lead screw slider assembly, the front side of the fixed stand plate (3) is connected to a product fixture (4) via a slide rail (7), and a centering assembly (6) is provided on the front lower side of the fixed stand plate (3); The centering assembly (6) comprises a hand crank, a bevel gear, a screw assembly, a Z-axis moving plate, a Y-axis moving guide rail, and a fixed flange. The screw assembly is connected to the back of the fixed vertical plate (3) through a connecting piece. The top axis of the first screw (6-7) of the screw assembly is connected to the bevel gear one (6-9), the bevel gear one (6-9) is meshedly connected to the bevel gear two (6-10), and the bevel gear two (6-10) is connected to the hand crank (6-12) through a rotating shaft (6-11). The screw nut (6-8) of the screw assembly is connected to the Z-axis moving plate (6-1) through a connecting piece, and the two sides of the bottom of the Z-axis moving plate (6-1) are respectively connected to the Y-axis moving guide rails (6-3), the Y-axis moving guide rail (6-3) is slidably connected to the Y-axis moving plate (6-6), and the top of the Y-axis moving plate (6-6) is connected to the fixed flange (6-2) through a connecting piece.

2. A steering column torsional stiffness testing device according to claim 1, characterized in that: A rotating hand wheel (2-1) is provided on the top of the platform column (2); the bottom of the rotating hand wheel (2-1) is connected to a second lead screw (2-2); the second lead screw (2-2) is connected to a slider assembly (2-3); and the slider assembly (2-3) is connected to one side of the fixed vertical plate (3).

3. A device for testing the torsional stiffness of a steering column according to claim 1, characterized in that: At least two of the product clamps (4) are provided, and the bottom of the product clamp (4) is slidably connected to a slide rail (7), and the slide rail (7) is embedded in the fixed vertical plate (3).

4. A steering column torsional stiffness testing device according to claim 1, characterized in that: The Z-axis movable plate (6-1) is located at the lower front side of the fixed vertical plate (3).

5. The device for testing the torsional stiffness of a steering column according to claim 1, characterized in that: The fixed flange (6-2) is located above the Z-axis moving plate (6-1), and the output shaft clamping tooling (8) is connected to the fixed flange (6-2).

6. The device for testing the torsional stiffness of a steering column according to claim 1, characterized in that: A guide rail limit stopper (6-4) is provided at the front end of the Y-direction movable guide rail (6-3).

7. The device for testing the torsional stiffness of a steering column according to claim 1, characterized in that: Both sides of the rear portion of the Z-axis movable plate (6-1) are respectively connected to the Z-direction movable guide rails (6-13) through slider assemblies, and the Z-direction movable guide rails (6-13) are fixedly connected to the front side of the fixed vertical plate (3).

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