Novel lead screw supporting pin for flexible shaft type angle adjusting electric adjusting pipe column and electric adjusting pipe column

Abstract

The utility model relates to a novel lead screw supporting pin for a flexible shaft type angle adjusting electric adjusting pipe column and the electric adjusting pipe column. Comprising a pin shaft seat, a transition seat and a pin shaft rod, the diameters of the pin shaft seat, the transition seat and the pin shaft rod are sequentially reduced, a lead screw penetrating hole is formed in the pin shaft seat in the radial direction, the outer circumferential surface of the pin shaft rod is a rough surface, and the end face of the side, facing the pin shaft rod, of the transition seat is a rough surface. The knurling form on the surface of the lead screw supporting pin ensures that the press-fitting process is firmer, and the requirement for higher-level vibration endurance tests of the steering column can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric adjustable pipe columns, in particular to a novel lead screw support pin for a flexible shaft type angle adjustable electric adjustable pipe column and an electric adjustable pipe column. Background Art

[0002] At present, the main engine manufacturers use the flexible shaft angle adjustment structure on the electric adjustment column. Its design is as follows: Figure 7 As shown, it includes an aluminum cast tube 100, an inner column 101, an angle adjustment bracket 102 and an angle adjustment device 103. The inner column tube 101 is installed inside the aluminum cast tube 100. The end of the aluminum cast tube 100 is hinged with the angle adjustment bracket 102. The angle adjustment device 103 is installed on the aluminum cast tube 100 and drives the aluminum cast tube to adjust the angle through the angle adjustment bracket. The angle adjustment device includes a motor 104, a flexible shaft 105, a bearing seat 106, a support pin 107, a lead screw 108, and a nut seat 109. A through hole for the lead screw support pin 107 to pass through is opened on the side of the bearing seat 106. The lead screw support pin 107 is pressed into the upper part of the steering column with interference fit. The support pin 107 passes through the through hole to install the bearing seat 106 on the side of the aluminum cast tube 100. The angle adjustment device 103 drives the angle adjustment bracket 102 to rotate on the support, so that the angle adjustment bracket 102 drives the inner column tube in the aluminum cast tube 100 to adjust the angle. In the prior art, the mating surface where the support pin contacts the steering column is a smooth surface, which can meet the basic unidirectional constant frequency vibration endurance test requirements.

[0003] However, the main engine manufacturers have proposed a higher standard of vibration durability test. The highest requirement for vibration durability of the whole vehicle is to test it according to the random vibration requirements of IEC 60068 2,64. The test time for each plane of the column is 8 hours, and the root mean square value of acceleration is 27.1m / s 2 , the relationship between PSD and frequency is as follows Figure 5-6 The mating surface of the above-mentioned support pin is smooth. For the random waveform vibration test with higher requirements and the XYZ three-dimensional vibration endurance test, the screw support pin will be out of the steering column. Since the screw support pin is a key part for cooperating with the motor to adjust the column angle, if the part is out, it will cause the angle adjustment process to get stuck. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of screw support pin and an electric adjustment pipe column for a flexible shaft type angle adjustment electric adjustment pipe column, which can ensure that the press-fitting process is more firm and can meet higher-level vibration endurance test requirements.

[0005] The technical solution of this utility model:

[0006] A new type of lead screw support pin for a flexible shaft type angle adjustment electrically adjustable pipe column comprises a pin shaft seat, a transition seat and a pin shaft rod. The diameters of the pin shaft seat, the transition seat and the pin shaft rod are successively reduced. A lead screw through hole is radially opened on the pin shaft seat. The outer circumferential surface of the pin shaft rod is a rough surface, and the end face of the transition seat facing the pin shaft rod is a rough surface.

[0007] Beneficial effects of the utility model:

[0008] 1. The knurling on the surface of the screw support pin of the present application ensures that the press-fitting process is more solid and can meet the higher level vibration durability test requirements of the steering column.

[0009] 2. This application does not add other parts and does not involve cost increase. It only changes the processing method of the screw support pin, which has low cost and good effect.

[0010] 3. The screw support pin of the present application makes the press-fitting surface more solid, and the forced vibration in the circumferential and radial directions can ensure that there is no risk of disengagement and rotation after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0012] Figure 1 This is a schematic diagram of the structure of the flexible shaft angle-adjustable electrically adjustable pipe column for this application.

[0013] Figure 2 This is a partial enlarged view of the flexible shaft type angle adjustment electrically adjustable pipe column of this application.

[0014] Figure 3 This is a schematic diagram of the new screw support pin structure of this application.

[0015] Figure 4 This is a schematic diagram of the side structure of the new screw support pin in this application.

[0016] Figure 5-6 This is the requirement diagram for random vibration test.

[0017] Figure 7 It is a schematic diagram of the decomposition of the flexible shaft type angle adjustment electric adjustment pipe column in the prior art.

[0018] In this application Figure 1-6 Reference numerals:

[0019] Support 1; aluminum cast tube 2; inner column tube 3; angle adjustment bracket 4; angle adjustment device 5; angle adjustment motor 6; flexible shaft 7; bearing seat 8; screw support pin 9; nut seat 10; pin seat 91; transition seat 92; pin rod 93; through hole 94; outer circumferential surface 95; end face 96.

[0020] Background technology Figure 7 Reference numerals:

[0021] Aluminum die-cast pipe 100; inner pipe column 101; angle adjustment bracket 102; angle adjustment device 103; motor 104; flexible shaft 105; bearing seat 106; support pin 107; lead screw 108; nut seat 109. DETAILED DESCRIPTION

[0022] In order to solve the problems in the background technology, an electrically adjustable pipe column and a new pin shaft for flexible shaft angle adjustment are specially invented to prevent the screw support pin from falling out during operation and causing the angle adjustment process to get stuck.

[0023] like Figure 1 As shown, the soft-shaft angle-adjustable electrically adjustable tube column of the present application comprises a support 1, an aluminum cast tube 2, an inner column tube 3, an angle-adjusting bracket 4 and an angle-adjusting device 5; the inner column tube 3 is installed inside the aluminum cast tube 2, the tail of the aluminum cast tube 2 is hinged to the tail of the support 1, the angle-adjusting bracket 4 is installed at the end of the support 1, and the angle-adjusting device 5 is installed on the aluminum cast tube 2 and drives the aluminum cast tube 2 to adjust its angle through the angle-adjusting bracket 4.

[0024] The angle adjustment device 5 includes an angle adjustment motor 6, a flexible shaft 7, a bearing seat 8, a screw support pin 9, a nut seat 10 and a screw. The flexible shaft 7 is connected to the drive shaft of the angle adjustment motor 6. The screw passes through the bearing seat 8 and is connected to the flexible shaft 7. The nut seat 10 is sleeved on the screw and is rotatably connected to the screw. The nut seat 10 is hinged on the side of the angle adjustment bracket. The bearing seat 8 is installed on the side of the aluminum casting tube 2 through the screw support pin. The screw support pin 9 is arranged vertically with the screw. A through hole for the screw support pin 9 to pass through is opened on the side of the bearing seat 8. The screw support pin 9 passes through the through hole to install the bearing seat on the side of the aluminum casting tube. The inside of the nut seat 10 is provided with a threaded hole that cooperates with the screw. Both sides of the nut seat 10 are provided with hinge shafts. The hinge shaft on one side of the nut seat 10 is hinged in the hinge hole on the side of the angle adjustment bracket. A baffle plate for shielding the nut seat is arranged on the side of the angle adjustment bracket, and a hinge shaft on the other side of the nut seat is hinged in the hinge hole of the connecting plate.

[0025] like Figure 3-4 As shown,

[0026] The screw support pin 9 includes a pin seat 91, a transition seat 92 and a pin rod 93. The diameters of the pin seat 91, the transition seat 92 and the pin rod 93 are reduced successively. The pin seat 91 is radially provided with a through hole 94 for the screw to pass through. The outer circumferential surface 95 of the pin rod 93 is a rough surface, and the end surface 96 of the transition seat 92 facing the pin rod 93 is a rough surface.

[0027] Preferably, the outer circumferential surface 95 of the pin shaft rod 93 is processed with knurling or pitting, and the end surface 96 of the transition seat 92 facing the pin shaft rod is processed with knurling or pitting.

[0028] Preferably, the knurling is a circular shape, a circular groove, a vertical shape, an irregular texture, etc.

[0029] The application is described in detail below with reference to the accompanying drawings:

[0030] like Figure 1-4 As shown, the present application is applied to an electrically adjustable column assembly for flexible shaft angle adjustment, such as Figure 1 This is a steering column assembly that uses a flexible shaft angle adjustment structure. The flexible shaft angle adjustment structure is installed on the column tube. Figure 2 , mark 9 is the screw support pin part in the flexible shaft angle adjustment device; mark 2 is the aluminum casting tube 2 that matches the screw support pin; the assembly form is that the screw support pin is pressed into the aluminum casting tube by interference fit, and the surface of the screw support pin is as follows Figure 3 and 4 As shown, it has two contact surfaces with the aluminum cast tube. The main matching area is the outer circumference of the pin shaft rod, which can be processed in the form of knurling (including arcs, circular grooves, vertical shapes, irregular textures, etc.), pitting, etc. The end face of the transition seat facing the pin shaft rod is the secondary matching area, which can be processed in the form of knurling, pitting, protrusions, etc. After the surface treatment, the screw support pin will not produce a significant difference in the force value during the press-fitting process when it is pressed into the aluminum cast tube, but the pull-out force and rotational torque after press-fitting are greatly improved. In the random vibration test XYZ specified in IEC 600682,64 for eight hours each, the screw support pin will not fall out, which can reduce the risk of high-frequency vibration of the whole vehicle.

[0031] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and does not deviate from the technical solution of the present invention, and designs a structure and implementation similar to the technical solution based on the above implementation examples without creativity, they shall all fall within the protection scope of the present invention.

Claims

1. A new type of screw support pin for a flexible shaft angle-adjustable electrically adjustable pipe column, characterized in that: It includes a pin seat, a transition seat and a pin rod. The diameters of the pin seat, the transition seat and the pin rod are reduced in sequence. A screw through hole is radially opened on the pin seat. The outer circumferential surface of the pin rod is a rough surface. The end face of the transition seat facing the pin rod is a rough surface.

2. According to claim 1, a new type of screw support pin for a flexible shaft angle-adjustable electrically adjustable pipe column is characterized in that: The outer circumferential surface of the pin shaft rod is processed with knurling or pitting, and the end surface of the transition seat facing the pin shaft rod is processed with knurling or pitting.

3. According to claim 2, a new type of screw support pin for a flexible shaft angle-adjustable electrically adjustable pipe column is characterized in that: The knurling is in the form of circular circles, circular grooves, vertical shapes or irregular textures.

4. A flexible shaft angle adjustable electric adjustment column, characterized in that: It includes an aluminum cast tube, an inner column tube, an angle adjustment bracket and an angle adjustment device, wherein the inner column tube is installed inside the aluminum cast tube, the angle adjustment bracket is installed at the end of the support, the angle adjustment device is installed on the aluminum cast tube and drives the aluminum cast tube to adjust the angle through the angle adjustment bracket, the angle adjustment device includes an angle adjustment motor, a flexible shaft, a bearing seat, a lead screw support pin, a lead screw, and a nut seat, the flexible shaft is connected to the driving shaft of the angle adjustment motor, the lead screw passes through the bearing seat and is connected to the flexible shaft, the nut seat is sleeved on the lead screw and is rotatably connected to the lead screw, the nut seat is hinged to the side of the angle adjustment bracket, the bearing seat is installed on the side of the aluminum cast tube through the lead screw support pin, and the lead screw support pin is vertically arranged with the lead screw; The screw support pin comprises a pin seat, a transition seat and a pin rod, the diameters of the pin seat, the transition seat and the pin rod are successively reduced, a screw through hole is radially opened on the pin seat, the outer circumferential surface of the pin rod is a rough surface, and the end surface of the transition seat facing the pin rod is a rough surface; The pin shaft of the lead screw support pin is interference pressed into the aluminum casting tube, and the outer circumferential surface of the pin shaft and the end surface of the transition seat facing the pin shaft are in close contact with the aluminum casting tube.

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