Commercial vehicle steering column dustproof sealing structure and commercial vehicle

Abstract

The invention discloses a commercial vehicle steering column dustproof sealing structure and a commercial vehicle, the dustproof sealing structure is arranged between a steering column telescopic shaft and a steering dustproof cover, and the dustproof sealing structure comprises a steering bushing composed of a steering bushing lining body, a steering bushing pressing plate and a steering bushing sealing ring; the upper part of the lining body of the steering lining is hung with the dustproof cover through an annular convex thorn and is in clearance fit with the telescopic shaft through an inner side smooth bulge; the lower expansion part is provided with a mounting space, an arc-shaped boss and a clamping groove opening; a rectangular hole is formed in the steering bushing sealing ring, and a buckle is arranged on the steering bushing pressing plate; during installation, the buckle sequentially penetrates through the rectangular hole and the clamping groove opening to be combined with the expansion part in a hanging mode, the sealing ring is pressed and fixed in the installation space, and the inner side of the sealing ring is in interference fit with the telescopic shaft. Through a buckle type mounting structure, the sealing ring is firmly fixed and convenient to disassemble and assemble, dust is effectively prevented, and frictional wear and steering abnormal sound are reduced.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle technology, specifically to a dustproof sealing structure for a commercial vehicle steering column and a commercial vehicle. Background Technology

[0002] The steering column dust seal consists of a rubber steering dust cover and a steering bushing. The rubber steering dust cover is installed on the outside of the passage hole in the cab floor. The rubber steering dust cover has a corrugated structure, which can compensate for some assembly errors and also provides allowance for deformation of the rubber bushing during cab rollover. Existing steering bushings are generally made of hard engineering plastics, and the steering bushing and steering column telescopic shaft are clearance-fitted. Therefore, dust and other particles can easily enter the cab through the gap between the steering column telescopic shaft and the steering bushing. At the same time, because the steering bushing and steering column telescopic shaft have hard friction, it will cause wear to the steering column telescopic shaft, and abnormal noise will also occur during steering. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the purpose of this invention is to provide a dustproof sealing structure for a commercial vehicle steering column and a commercial vehicle. The overall structure and layout remain unchanged, but the steering bushing structure is optimized to achieve a good sealing effect between the steering bushing and the steering telescopic shaft. At the same time, the friction between the steering bushing and the steering telescopic shaft is reduced, the wear of the steering telescopic shaft is reduced, and the steering noise is reduced. Since the overall structure and layout remain unchanged, it can directly replace the original structure.

[0004] The present invention solves the above problems through the following technical solution:

[0005] A dustproof sealing structure for a commercial vehicle steering column is disposed between the steering column telescopic shaft and the steering dust cover. It includes a steering bushing composed of a steering bushing liner, a steering bushing pressure plate, and a steering bushing sealing ring. The steering bushing liner is generally an annular column structure, with annular protrusions on its upper outer side for engaging with the steering dust cover, and smooth protrusions on its upper inner side for clearance fitting with the steering column telescopic shaft. An outwardly expanding extension portion is formed at the lower part of the steering bushing liner, and an installation space is formed within the extension portion. Several arc-shaped bosses are spaced apart above the extension portion, closely adhering to the outer side of the steering bushing liner, with a sealing ring between adjacent arc-shaped bosses. The steering bushing sealing ring has a ring-shaped structure with several rectangular holes evenly spaced around its circumference, the rectangular holes corresponding to the slot opening; the steering bushing pressure plate includes a ring-shaped portion and several buckles arranged around the circumference of the ring-shaped portion, the buckles corresponding to the slot opening; wherein, the buckles pass through the rectangular holes and the slot opening in sequence and engage with the extension portion to press and fix the steering bushing sealing ring in the installation space; the inner side of the steering bushing sealing ring is interference-fitted with the steering column telescopic shaft, and the steering bushing forms a two-end fit with the steering bushing sealing ring and the steering column telescopic shaft through the smooth protrusion at the upper end.

[0006] As a further improvement of the present invention, the height of the arc-shaped boss is higher than the highest point of the buckle after installation.

[0007] As a further improvement of the present invention, after installation, the lowest point of the steering bushing pressure plate is higher than the lowest point of the steering bushing liner.

[0008] As a further improvement of the present invention, the height of the annular protrusion is lower than the height of the smooth protrusion.

[0009] As a further improvement of the present invention, the buckle of the steering bushing pressure plate is located at the inwardly recessed position of the outer edge of the annular portion, so that there is a gap between the outer edge of the annular portion and the buckle, and the outer edge of the annular portion is spaced apart from the inner side of the installation space of the steering bushing liner.

[0010] As a further improvement of the present invention, a plurality of lower clamping ribs are formed on the inner surface of the mounting space of the steering bushing liner, and a plurality of upper clamping ribs are formed on the upper side of the annular portion of the steering bushing pressure plate, wherein the lower clamping ribs and the upper clamping ribs respectively cooperate with the steering bushing sealing ring.

[0011] As a further improvement of the present invention, the steering bushing sealing ring is made of felt or foamed sponge.

[0012] As a further improvement of the present invention, the number of the buckles is four, and they are evenly distributed.

[0013] Furthermore, the present invention also solves the above problems through the following technical solutions:

[0014] A commercial vehicle is provided with a dustproof sealing structure for the steering column of a commercial vehicle as described above.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The steering bushing of the present invention is assembled from three parts: steering bushing body, steering bushing sealing ring, and steering bushing pressure plate. The buckle of the steering bushing pressure plate passes through the rectangular hole of the steering bushing sealing ring and engages with the extension of the steering bushing body through the buckle, thereby firmly fixing the steering bushing sealing ring in the installation space of the steering bushing body. The buckle connection structure makes installation and disassembly very convenient.

[0017] (2) The steering bushing sealing ring of this invention adopts a suitable interference fit with the steering column telescopic shaft, achieving a good sealing effect and effectively reducing friction between it and the steering column telescopic shaft, thereby reducing shaft wear and steering noise. The steering bushing sealing ring can be made of wool felt, other felts, or foam sponge, etc., which have good wear resistance or sealing performance. The four rectangular holes on it serve two purposes: firstly, for the steering bushing pressure plate to pass through, and secondly, for positioning the sealing ring itself to prevent it from falling off.

[0018] (3) The present invention provides an arc-shaped boss on the outside of the slot of the steering bushing. After installation, the height of the arc-shaped boss is slightly higher than the highest point of the buckle. This design can be used for positioning the steering dust cover and can also prevent the steering dust cover from directly pressing against the buckle, thus avoiding the steering bushing pressure plate from loosening.

[0019] (4) A smooth protrusion is formed on the inner side of the upper end of the steering bushing of the present invention. The smooth protrusion is designed to be rounded, and its diameter is smaller than that of the main body of the steering bushing. The smooth protrusion at the upper end and the steering bushing sealing ring at the lower end together form a two-end fit with the steering column telescopic shaft, and the middle area is hollowed out. This structure significantly reduces the contact area between the steering bushing and the steering column telescopic shaft, thereby reducing friction, wear and steering noise.

[0020] (5) In order to further fix the steering bushing sealing ring, the present invention forms several lower clamping ribs on the inner surface of the installation space of the steering bushing liner, and several upper clamping ribs on the upper side of the annular part of the steering bushing pressure plate. These ribs cooperate with the steering bushing sealing ring to fix it more firmly in the radial and circumferential directions, effectively preventing the steering bushing sealing ring from rotating with the steering column telescopic shaft, and reducing the radial movement of the sealing ring. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the existing steering bushing.

[0022] Figure 2 This is a schematic diagram of a dustproof sealing structure for a commercial vehicle steering column according to the present invention;

[0023] Figure 3 This is a schematic diagram of the steering bushing of the present invention;

[0024] Figure 4 This is an exploded view of the steering bushing of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the steering bushing liner of the present invention;

[0026] Figure 6 This is a schematic diagram of the steering bushing pressure plate of the present invention.

[0027] Figure label:

[0028] 1. Cab floor plate; 2. Steering dust cover; 3. Steering bushing liner; 31. Annular protrusion; 32. Arc-shaped boss; 33. Slot; 34. Smooth protrusion; 35. Lower clamping rib; 4. Steering bushing pressure plate; 41. Buckle; 42. Upper clamping rib; 5. Steering bushing sealing ring; 51. Rectangular hole; 6. Steering column telescopic shaft; 7. Existing steering bushing. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figure 1 The existing steering bushing 7 is generally made of hard engineering plastic. If the existing steering bushing and the steering column telescopic shaft 6 are fitted with a clearance fit, dust and other particles can easily enter the driver's cab through the gap between the steering column telescopic shaft 6 and the existing steering bushing 7. At the same time, since the existing steering bushing 7 and the steering column telescopic shaft 6 have hard friction, it will cause wear to the steering column telescopic shaft, and the steering will also produce abnormal noise.

[0031] Example:

[0032] Combined with appendix Figure 2-6 As shown, a dustproof sealing structure for a commercial vehicle steering column is provided between the steering column telescopic shaft 6 and the steering dust cover 2 to achieve a seal; it includes a steering bushing composed of three parts: a steering bushing liner 3 with a through-hole, a steering bushing pressure plate 4, and a steering bushing sealing ring 5.

[0033] The steering bushing liner 3 has an overall ring-shaped column structure. The upper outer side of the steering bushing liner 3 has an annular protrusion 31, and the upper inner side has a smooth protrusion 34. When the steering bushing is installed between the steering column telescopic shaft 6 and the steering dust cover 2, the annular protrusion 31 engages with the steering dust cover 2, and the smooth protrusion 34 is clearance-fitted with the steering column telescopic shaft 6. Furthermore, the smooth protrusion 34 can further ensure that the steering bushing liner 3 and the steering column telescopic shaft 6 are in arc-shaped contact under the action of external force, so as to prevent damage to the steering column telescopic shaft 6. The lower part of the steering bushing liner 3 extends outward, forming an installation space for accommodating the steering bushing pressure plate 4 and the steering bushing sealing ring 5. Above the extension, where it connects with the middle part of the steering bushing liner 3, several arc-shaped bosses 32 are provided close to the outer side of the steering bushing liner 3 for abutting against the steering dust cover 2. A slot 33 parallel to the axial direction of the steering bushing liner 3 is provided between two adjacent arc-shaped bosses 32.

[0034] The steering bushing sealing ring 5 is an annular structure, and several rectangular holes 51 are evenly arranged along the circumference of the annular structure. These rectangular holes 51 are corresponding to the slots 33 of the steering bushing liner 3.

[0035] The bottom of the steering bushing pressure plate 4 is an annular part, and several buckles 41 that extend upwards and correspond to the slots 33 of the steering bushing liner 3 are provided along the circumference of the annular part.

[0036] During installation, the clip 41 passes sequentially through the rectangular hole 51 of the steering bushing sealing ring 5, the slot 33 of the steering bushing liner 3, and engages with the extension portion, thus pressing the steering bushing sealing ring 5 firmly in place and facilitating easy installation and removal. At this point, the height of the arc-shaped boss 32 is higher than the highest point of the clip 41 to prevent interference between the steering dust cover 2 and the clip 41. After installation, the lowest point of the steering bushing pressure plate 4 is higher than the lowest point of the steering bushing liner 3, ensuring complete installation within the mounting space. The inner side of the steering bushing sealing ring 5 is press-fitted with the steering column telescopic shaft 6, and the upper and outer sides of the steering bushing sealing ring 5 are press-fitted with the inner mounting space of the steering bushing liner 3.

[0037] In this embodiment, the height of the annular protrusion 31 is set lower than the height of the smooth protrusion 34.

[0038] Furthermore, the buckle 41 of the steering bushing pressure plate 4 is located at the inwardly recessed position of the outer edge of the annular portion, so that the outer edge of the annular portion is at a certain distance from the buckle 41. The outer edge of the annular portion is used to be spaced apart from the inner installation space of the steering bushing liner 3, so that the steering bushing sealing ring 5 has a certain amount of compression; and the annular portion of the steering bushing pressure plate 4 presses and supports the steering bushing sealing ring 5 to ensure that the steering bushing sealing ring 5 is always located within the installation space.

[0039] Preferably, a plurality of mesh-like lower clamping ribs 35 are formed in the installation space of the steering bushing liner 3, and a plurality of mesh-like upper clamping ribs 42 are formed on the upper side of the annular portion of the steering bushing pressure plate 4. The lower clamping ribs 35 and the upper clamping ribs 42 respectively cooperate with the steering bushing sealing ring 5, so that the steering bushing sealing ring is more firmly fixed radially and axially, preventing the steering bushing sealing ring from rotating with the steering column telescopic shaft, and reducing the radial movement of the sealing ring.

[0040] The present invention incorporates a steering bushing sealing ring 5 in the design of the steering bushing. The steering bushing sealing ring 5 is made of wool felt, other felts, foam sponge, etc., possessing good wear resistance or sealing performance. The steering bushing sealing ring 5 and the steering column telescopic shaft are fitted with a suitable interference fit, achieving a good sealing effect between the steering bushing and the steering column telescopic shaft, while reducing friction between them, thus reducing wear on the steering column and minimizing steering noise. The steering bushing sealing ring 5 has four rectangular holes 51 for the pressure plate to pass through and for positioning the sealing ring, preventing it from falling off.

[0041] An additional space is added at the lower end of the steering bushing liner 3 to accommodate the steering bushing sealing ring 5, which is then enclosed within it. The steering bushing liner 3 has four slots for mounting the clips 41. An arc-shaped boss 32 is added outside the slots; after installation, the arc-shaped boss 32 is slightly higher than the clips 41, serving to position the steering dust cover and prevent it from pressing against the clips, thus preventing the pressure plate from loosening. A smooth protrusion is added to the inner upper end of the steering bushing liner, employing a rounded design. The diameter of the smooth protrusion is smaller than the diameter of the main body of the steering bushing liner 3. The upper smooth protrusion and the lower steering bushing sealing ring 5 form a two-end fit with the steering column telescopic shaft, with a hollow center. This reduces friction between the steering bushing and the steering column telescopic shaft, reducing wear on the steering column telescopic shaft and minimizing steering noise.

[0042] In an optional embodiment, four clips 41 are provided, evenly distributed. This facilitates installation and removal, and is more cost-effective and reliable compared to adhesive and heat-sealing processes.

[0043] In another alternative embodiment, a commercial vehicle is provided with a dustproof sealing structure for a commercial vehicle steering column as described above.

[0044] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A dustproof sealing structure for a commercial vehicle steering column, disposed between the steering column telescopic shaft (6) and the steering dust cover (2), characterized in that, The steering bushing consists of a steering bushing liner (3), a steering bushing pressure plate (4), and a steering bushing sealing ring (5); The steering bushing liner (3) is an overall ring-shaped column structure. The upper outer side has an annular protrusion (31) for engaging with the steering dust cover (2), and the upper inner side has a smooth protrusion (34) for clearance matching with the steering column telescopic shaft (6). The lower part of the steering bushing liner (3) has an outwardly expanding part, and an installation space is formed in the expanding part. Several arc-shaped bosses (32) are arranged at intervals above the expanding part and close to the outer side of the steering bushing liner (3). A slot (33) is provided between adjacent arc-shaped bosses (32). The steering bushing sealing ring (5) is an annular structure with several rectangular holes (51) evenly opened around its circumference. The rectangular holes (51) correspond to the slot opening (33). The steering bushing pressure plate (4) includes an annular portion and a plurality of buckles (41) arranged circumferentially along the annular portion, wherein the buckles (41) correspond to the buckle slots (33); The buckle (41) passes through the rectangular hole (51) and the slot (33) in sequence and engages with the extension part to press and fix the steering bushing sealing ring (5) in the installation space; the inner side of the steering bushing sealing ring (5) is press-fitted with the steering column telescopic shaft (6), and the steering bushing forms a two-end fit with the steering bushing sealing ring (5) and the steering column telescopic shaft (6) at the lower end through the smooth protrusion (34) at the upper end.

2. The dustproof sealing structure for a commercial vehicle steering column according to claim 1, characterized in that, The height of the arc-shaped boss (32) is higher than the highest point of the buckle (41) after installation.

3. The dustproof sealing structure for a commercial vehicle steering column according to claim 1, characterized in that, After installation, the lowest point of the steering bushing pressure plate (4) is higher than the lowest point of the steering bushing liner (3).

4. The dustproof sealing structure for a commercial vehicle steering column according to claim 1, characterized in that, The height of the annular protrusion (31) is lower than the height of the smooth protrusion (34).

5. The dustproof sealing structure for a commercial vehicle steering column according to claim 1, characterized in that, The buckle (41) of the steering bushing pressure plate (4) is located at the inward position of the outer edge of the annular part, so that there is a gap between the outer edge of the annular part and the buckle (41), and the outer edge of the annular part is spaced apart from the inner side of the installation space of the steering bushing liner (3).

6. A dustproof sealing structure for a commercial vehicle steering column according to any one of claims 1-5, characterized in that, The inner surface of the mounting space of the steering bushing liner (3) is provided with a plurality of lower clamping ribs (35), and the upper side of the annular portion of the steering bushing pressure plate (4) is provided with a plurality of upper clamping ribs (42). The lower clamping ribs (35) and the upper clamping ribs (42) respectively cooperate with the steering bushing sealing ring (5).

7. A dustproof sealing structure for a commercial vehicle steering column according to any one of claims 1-5, characterized in that, The steering bushing sealing ring (5) is made of felt or foamed sponge.

8. A dustproof sealing structure for a commercial vehicle steering column according to any one of claims 1-5, characterized in that, The number of the buckles (41) is four, and they are evenly distributed.

9. A commercial vehicle, characterized in that, The steering column of a commercial vehicle is provided with a dustproof sealing structure as described in any one of claims 1-8.

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