Steering nut small assembly locking ring assembling method

Abstract

The invention relates to the technical field of steering system assembling, in particular to a steering nut small assembly locking ring assembling method. Compared with the prior art, through the assembling method of tightening, unscrewing and secondary riveting of the locking ring, different supplied material differences are stably compatible, the compression amount of the double-row bearing and the wave spring is guaranteed, and it is guaranteed that no shaking or noise or other abnormal conditions exist in the whole vehicle steering process; output force of the motor is amplified through a connecting rod mechanism composed of a driving plate and a connecting rod, it is guaranteed that riveting is not too shallow, and therefore it is guaranteed that the locking ring is prevented from loosening, and steering safety is guaranteed; and the three riveting heads simultaneously perform the same displacement, so that the three riveting points are uniform in depth, the steering hand feeling is ensured to be stable and free of fluctuation, and the driving experience is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of steering system assembly, in particular to an assembly method for a locking ring of a steering nut subassembly. Background Art

[0002] The steering nut subassembly is an important component of the parallel axis electric steering gear, which consists of a steering nut, a pulley, a wave spring, a double row bearing and a locking ring.

[0003] In the assembly of the entire steering nut subassembly, the tightening and riveting process of the locking ring is crucial.

[0004] The tightening of the locking ring is mainly done by pre-tightening manually. The tightening degree of each locking ring is different, and the double-row bearings and wave springs from different batches also have size differences. Manual tightening cannot guarantee the process capability stability of the compression of the double-row bearings and wave springs. The compression of the wave springs and double-row bearings may be insufficient, which may cause abnormal conditions such as steering wheel shaking and noise when the vehicle is turning; the steering force may also be significantly larger when there is no load.

[0005] For the riveting of the locking ring, if the riveting is too shallow, there is a chance that the locking ring will loosen, and the entire vehicle will be unable to turn, endangering the safety of the driver and passengers; if there is unevenness in the depth between the rivet points, it will also cause excessive fluctuations in hand force when the vehicle is turned.

[0006] Therefore, it is necessary to design a steering nut small assembly locking ring assembly method to ensure the stability of the locking ring tightening degree and riveting depth, so as to avoid abnormal conditions such as steering wheel shaking and noise, and ensure the driving safety and driving experience of the entire vehicle. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a method for assembling a locking ring of a steering nut subassembly to ensure the stability of the tightening degree and riveting depth of the locking ring, thereby avoiding abnormal conditions such as steering wheel shaking and noise, and ensuring the driving safety and driving experience of the entire vehicle.

[0008] In order to achieve the above-mentioned objectives, the present invention is a method for assembling a locking ring of a steering nut subassembly, comprising the following steps: step 1, tightening the locking ring to a trigger torque of 25-35 Nm using a tightening tool; step 2, continuing to tighten the locking ring to a tightening angle using a tightening tool, and the tightening angle is 15-25°; step 3, loosening the locking ring to a trigger torque of 5-15 Nm using a tightening tool; step 4, continuing to loosen the locking ring to a loosening angle using a tightening tool; step 5, performing a first riveting on the locking ring using a riveting device; step 6, tightening the locking ring to a trigger torque of 5-15 Nm using a tightening tool; step 7, continuing to tighten the locking ring to a tightening angle using a tightening tool, and the tightening angle is 15-25°; step 8, performing a second riveting on the locking ring using a riveting device.

[0009] The riveting device includes a servo drive system, a riveting disk assembly, and a connecting rod. The shaft of the servo drive system is connected to one end of the connecting rod, and the other end of the connecting rod is connected to the driving end of the riveting disk assembly. The riveting disk assembly converts the linear thrust of the servo drive system into synchronous and uniform riveting force in three directions.

[0010] The rivet disk assembly includes a shell, a drive plate, a connecting rod, a rivet head, and a product positioning block. The drive plate is rotatably installed inside the shell. The driving end of the drive plate passes through the shell and is connected to the connecting rod. Three connecting rods are evenly distributed on the drive plate. A mounting hole is provided in the center of the drive plate. A product positioning block is fixed in the mounting hole. A rivet head is installed at the end of each connecting rod close to the product positioning block. The product positioning block cooperates with the ball screw of the steering nut subassembly to achieve circumferential positioning. As the drive plate rotates, the three rivet heads simultaneously form three rivet points of the same depth on the surface of the locking ring.

[0011] The loosening angle is determined based on the compression of the double-row bearing and the wave spring, specifically as follows: an initial loosening angle is set, and the actual compression of the double-row bearing and the wave spring at the initial loosening angle is measured. If the actual compression is greater than the expected compression, the loosening angle = the initial loosening angle + the loosening increase angle; if the actual compression is less than the expected compression, the loosening angle = the initial loosening angle - the loosening reduction angle.

[0012] The loosening angle is 50-90°.

[0013] The central angle between two adjacent connecting rods is 120 degrees.

[0014] The connecting rod includes a connecting rod body 1, a connecting rod body 2, and a rotating shaft. One end of the connecting rod body 1 is fixed to the driving plate, the other end of the connecting rod body 1 is connected to one end of the connecting rod body 2 by a rotating shaft, and the other end of the connecting rod body 2 is installed with a rivet head.

[0015] The bottom of the shell is connected to the upper end of the core shaft of the guide column, the lower end of the core shaft of the guide column is connected to the limit plate, and the outer sleeve of the guide column passes through the fixed plate and is connected to the fixed plate.

[0016] A cylinder is installed on the fixed plate, and a piston rod of the cylinder is connected to the bottom of the shell through a connecting piece.

[0017] Compared with the existing technology, the present invention stably accommodates the differences in different incoming materials through the assembly method of tightening, loosening and secondary riveting the locking ring, ensures the compression of the double-row bearings and wave springs, and ensures that there are no abnormal conditions such as shaking and noise during the steering process of the entire vehicle; the output force of the motor is amplified by the connecting rod mechanism composed of the drive plate and the connecting rod to ensure that the riveting is not too shallow, thereby ensuring that the locking ring is prevented from loosening and ensuring steering safety; the three rivet heads perform the same displacement at the same time, so that the three rivet points are even in depth, thereby ensuring that the steering feel is stable and without fluctuations, and ensuring the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention from the front side perspective.

[0019] Figure 2 It is a structural schematic diagram of the present invention from the rear side perspective.

[0020] Figure 3 This is a schematic diagram of the driving plate of the present invention before rotation.

[0021] Figure 4 This is a schematic diagram of the present invention after the driving plate rotates. DETAILED DESCRIPTION

[0022] The present invention will now be further described with reference to the accompanying drawings.

[0023] The present invention is a method for assembling a locking ring of a steering nut subassembly, comprising the following steps: Step 1: Use a tightening tool to tighten the locking ring to a trigger torque of 25-35 Nm to eliminate the difference in manual tightening torque.

[0024] Step 2: Use a tightening tool to continue tightening the locking ring to the tightening angle of 15-25°. Tighten the locking ring. At this time, the compression of the double-row bearing and wave spring is the largest. The incoming materials of different batches of double-row bearings and wave springs are different, so ensure that the initial state of each part is uniform.

[0025] In step 3, use a tightening tool to loosen the locking ring to a trigger torque of 5-15 Nm. This will eliminate any gaps between the tightening tool, other parts of the device, and the locking ring, ensuring that the next loosening angle acts on the locking ring.

[0026] Step 4: Use a tightening tool to continue loosening the locking ring to the loosening angle to control the compression of the double-row bearing and wave spring within the tolerance range. The compression of the double-row bearing and wave spring can be reduced or increased by increasing or decreasing the loosening angle.

[0027] The loosening angle is determined based on the compression of the double-row bearing and wave spring. Specifically, set the initial loosening angle and measure the actual compression of the double-row bearing and wave spring at the initial loosening angle. If the actual compression is greater than the expected compression, the loosening angle is calculated as follows: Initial loosening angle + Increase loosening angle. If the actual compression is less than the expected compression, the loosening angle is calculated as Initial loosening angle - Decrease loosening angle. The preferred loosening angle is 50-90°.

[0028] Step 5: Use a riveting device to perform the first riveting on the locking ring to achieve an anti-loosening effect.

[0029] In step 6, use a tightening tool to tighten the locking ring to a trigger torque of 5-15 Nm. This will eliminate any gaps between the tightening tool, other parts of the device, and the locking ring, ensuring that the next loosening angle acts on the locking ring.

[0030] Step 7: Use a tightening tool to continue tightening the locking ring to the tightening angle of 15-25 degrees. The tightening angle determines the angle difference between the first riveting point and the second riveting point.

[0031] Step 8: Use a riveting device to rivet the locking ring a second time to achieve a secondary anti-loosening effect.

[0032] In the present invention, the tightening tool is a Bosch Rexroth standard tightening gun.

[0033] See also Figure 1 、 Figure 2 The riveting device includes a servo drive system 1, a riveting disk assembly, and a connecting rod 7. The shaft of the servo drive system 1 is connected to one end of the connecting rod 7, and the other end of the connecting rod 7 is connected to the driving end of the riveting disk assembly. The servo drive system 1 provides power for the riveting disk assembly, and the riveting disk assembly converts the linear thrust of the servo drive system 1 into synchronized and uniform riveting forces in three directions. The riveting disk assembly includes a shell 2, a drive plate 8, a connecting rod 9, a rivet head 10, and a product positioning block 11. The drive plate 8 is rotatably mounted inside the shell 2. After the driving end of the drive plate 8 passes through the shell 2, it is connected to the connecting rod 7. Three connecting rods 9 are evenly distributed on the drive plate 8. A mounting hole is provided in the center of the drive plate 8. A product positioning block 11 is fixed in the mounting hole. A rivet head 10 is installed at the end of each connecting rod 9 near the product positioning block 11. The rivet head 10 is used to ensure the shape of the riveting point. The product positioning block 11 cooperates with the ball screw of the steering nut subassembly to achieve circumferential positioning. As the drive plate 8 rotates, the three rivet heads 10 simultaneously form three rivet points of the same depth on the surface of the locking ring.

[0034] The central angle between two adjacent connecting rods 9 is 120 degrees.

[0035] The connecting rod 9 includes a connecting rod body 1, a connecting rod body 2, and a rotating shaft. One end of the connecting rod body 1 is fixed to the driving plate 8, and the other end of the connecting rod body 1 is connected to one end of the connecting rod body 2 by a rotating shaft. The other end of the connecting rod body 2 is installed with a rivet head 10.

[0036] The bottom of the housing 2 is connected to the upper end of the core shaft of the guide column 3, the lower end of the core shaft of the guide column 3 is connected to the limit plate 6, and the outer sleeve of the guide column 3 passes through the fixed plate 4 and is connected to the fixed plate 4. The guide column 3 provides a guide for the up and down movement of the riveted disk assembly.

[0037] A cylinder 5 is mounted on the fixed plate 4, and its piston rod is connected to the bottom of the housing 2 via a connector. The cylinder 5 cooperates with the guide post 3 to control the vertical movement of the riveting plate assembly and servo drive system 1 relative to the fixed plate 4. A limit plate 6 limits the travel of the cylinder 5.

[0038] Among them, the servo drive system 1, the connecting rod 7, the cylinder 5, and the connecting parts are standard parts.

[0039] When welding the locking ring, the present invention first places the steering nut subassembly on a platform that is fixed relative to the fixing plate 4. The cylinder 5 cooperates with the guide column 3 to control the riveting disk assembly and the servo drive system 1 connected thereto to press down the steering nut subassembly. At the same time, the product positioning block 11 cooperates with the ball screw of the steering nut subassembly to position the product circumferentially, ensuring that the locking ring and the three riveted positions of the equipment are concentric. The servo drive system 1 drives the drive plate 8 to rotate through the connecting rod 7. The three connecting rods 9 convert the rotational motion of the drive plate 8 into linear motion to drive the rivet head 10 to rivet the locking ring. Figure 3 、 Figure 4 shown.

[0040] After testing, the assembly method of the present invention can stably accommodate the differences in incoming materials of double-row bearings and wave springs from different batches, ensuring that the compression amount CPK of the double-row bearings and wave springs is greater than 1.67.

[0041] The present invention adopts an assembly method of tightening, loosening and secondary riveting the locking ring to stably accommodate the differences in different incoming materials, ensure the compression of the double-row bearings and the wave spring, and ensure that there is no abnormality such as shaking and noise during the steering process of the entire vehicle; the output force of the motor is amplified by the connecting rod mechanism composed of the drive plate and the connecting rod to ensure that the riveting is not too shallow, thereby ensuring that the locking ring is prevented from loosening and ensuring steering safety; the three rivet heads perform the same displacement at the same time, so that the depth of the three rivet points is uniform, thereby ensuring that the steering feel is stable and without fluctuations, and ensuring the driving experience.

Claims

1. A method for assembling a locking ring of a steering nut subassembly, characterized in that: The steps include: Step 1, tighten the locking ring to a trigger torque of 25-35Nm using a tightening tool; Step 2, continue to tighten the locking ring to a tightening angle using a tightening tool, and the tightening angle is 15-25°; Step 3, loosen the locking ring to a trigger torque of 5-15Nm using a tightening tool; Step 4, continue to loosen the locking ring to a loosening angle using a tightening tool; Step 5, perform the first riveting of the locking ring using a riveting device; Step 6, tighten the locking ring to a trigger torque of 5-15Nm using a tightening tool; Step 7, continue to tighten the locking ring to a tightening angle using a tightening tool, and the tightening angle is 15-25°; Step 8, perform the second riveting of the locking ring using a riveting device; The riveting device comprises a servo drive system (1), a riveting disk assembly, and a connecting rod (7), wherein the shaft of the servo drive system (1) is connected to one end of the connecting rod (7), and the other end of the connecting rod (7) is connected to the driving end of the riveting disk assembly, and the riveting disk assembly converts the linear thrust of the servo drive system (1) into synchronous and uniform riveting forces in three directions; The riveting plate assembly comprises a housing (2), a driving plate (8), a connecting rod (9), a rivet head (10), and a product positioning block (11). The driving plate (8) is rotatably mounted inside the housing (2). After the driving end of the driving plate (8) passes through the housing (2), it is connected to the connecting rod (7). Three connecting rods (9) are evenly distributed on the driving plate (8). A mounting hole is provided in the center of the driving plate (8). A product positioning block (11) is fixed in the mounting hole. A rivet head (10) is mounted on the end of each connecting rod (9) close to the product positioning block (11). The product positioning block (11) cooperates with the ball screw channel of the steering nut subassembly to achieve circumferential positioning. As the driving plate (8) rotates, the three rivet heads (10) simultaneously form three rivet points of the same depth on the surface of the locking ring.

2. The method for assembling a locking ring of a steering nut subassembly according to claim 1, characterized in that: The loosening angle is determined according to the compression of the double-row bearing and the wave spring, as follows: an initial loosening angle is set, and the actual compression of the double-row bearing and the wave spring under the initial loosening angle is measured. If the actual compression is greater than the expected compression, the loosening angle = initial loosening angle + loosening increase angle; if the actual compression is less than the expected compression, the loosening angle = initial loosening angle - loosening reduction angle.

3. The method for assembling a locking ring of a steering nut subassembly according to claim 2, characterized in that: The loosening angle is 50-90°.

4. The method for assembling a locking ring of a steering nut subassembly according to claim 1, characterized in that: The central angle between two adjacent connecting rods (9) is 120 degrees.

5. The method for assembling a locking ring of a steering nut subassembly according to claim 1, characterized in that: The connecting rod (9) comprises a connecting rod body 1, a connecting rod body 2 and a rotating shaft. One end of the connecting rod body 1 is fixed to the driving plate (8), the other end of the connecting rod body 1 is connected to one end of the connecting rod body 2 by means of the rotating shaft, and the other end of the connecting rod body 2 is provided with a rivet head (10).

6. The method for assembling a locking ring of a steering nut subassembly according to claim 1, characterized in that: The bottom of the housing (2) is connected to the upper end of the core shaft of the guide column (3), the lower end of the core shaft of the guide column (3) is connected to the limit plate (6), and the outer sleeve of the guide column (3) passes through the fixed plate (4) and is connected to the fixed plate (4).

7. The method for assembling a locking ring of a steering nut subassembly according to claim 1, characterized in that: A cylinder (5) is mounted on the fixing plate (4), and a piston rod of the cylinder (5) is connected to the bottom of the housing (2) via a connecting piece.

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