Dual bearing steering column structure

Abstract

The utility model relates to the technical field of fork truck and discloses a double-bearing steering column structure, including lower pipe column assembly, the inner top of lower pipe column assembly is fixed with deep groove ball bearing, the inner bottom of lower pipe column assembly is fixed with thrust ball bearing, the inner ring of deep groove ball bearing and thrust ball bearing is fixed with steering axle together, the top of lower pipe column assembly is fixed with upper pipe column assembly, the top of upper pipe column assembly is equipped with nylon thread cover, and the nylon thread cover is equipped on the steering axle surface, the lower pipe column assembly includes long round steel, the bottom of long round steel is fixed with base, the top of long round steel is fixed with upper casing support, the surface of upper casing support is fixed with limit support, the surface of long round steel is fixed with lower casing support, the surface of long round steel and below lower casing are fixed with angle adjusting support. The utility model has stable structure, is stable when operating, and the service life is prolonged because of reduced abrasion.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a dual-bearing steering column structure. Background Technology

[0002] As a key piece of equipment in logistics handling, the performance of the steering system of a forklift directly affects the stability and safety of operation. Traditional single-bearing steering columns in forklifts are prone to problems such as rotational jamming, rapid wear, and steering shaft wobble due to insufficient bearing support during long-term use. This affects steering accuracy and service life, making it difficult to meet the demands of efficient and stable operation. Therefore, there is an urgent need to optimize and improve the steering column structure. To this end, a dual-bearing steering column structure was designed. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to propose a dual-bearing steering column structure, which is structurally stable, operates smoothly, and reduces wear, thus extending its service life.

[0004] According to the dual-bearing steering column structure proposed in this utility model, a lower column assembly is included. A deep groove ball bearing is fixed to the inner top of the lower column assembly, and a thrust ball bearing is fixed to the inner bottom of the lower column assembly. The inner rings of the deep groove ball bearing and the thrust ball bearing are jointly fitted and fixed to a steering shaft. An upper column assembly is fixed to the top of the lower column assembly, and a nylon sleeve is fitted to the top of the upper column assembly. The nylon sleeve is fitted onto the surface of the steering shaft. The lower tube column assembly includes a long round steel bar, a base is fixed to the bottom of the long round steel bar, an upper cover bracket is fixed to the top of the long round steel bar, a limit bracket is fixed to the surface of the upper cover bracket, a lower cover bracket is fixed to the surface of the long round steel bar, and an angle adjustment bracket is fixed to the surface of the long round steel bar and below the lower cover. The upper tubular column assembly includes a short round steel bar, and a fixing bracket is fixed to the bottom of the short round steel bar.

[0005] Preferably, the fixing bracket is fixed to the surface of the upper cover bracket, and a combination bolt is fixed between the fixing bracket and the upper cover.

[0006] Preferably, the base has a first mounting groove for assembling the thrust ball bearing, and the bottom of the steering shaft has a first mating groove.

[0007] Preferably, the inner top of the long round steel is provided with a second mounting groove for assembling the deep groove ball bearing, and the surface of the steering shaft is provided with a second mating groove.

[0008] Preferably, retaining rings are fitted at the assembly points of both the deep groove ball bearing and the thrust ball bearing.

[0009] Preferably, the outer surface of the nylon sleeve mates with the inner surface of the short round steel, the inner surface of the nylon sleeve mates with the outer surface of the steering shaft, and an annular boss is provided on the top of the nylon sleeve.

[0010] The beneficial effects of this utility model are: the lower end of the steering shaft is axially positioned by a thrust ball bearing, and the upper end is radially limited by a deep groove ball bearing. The steering shaft is reliably positioned, rotates smoothly, avoids local excessive wear and shaking problems, has a stable structure, runs smoothly, and the reduced wear extends its service life. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the overall structure of the dual-bearing steering column structure proposed in this utility model.

[0012] Figure 2 This is a schematic diagram of the steering shaft structure of the dual-bearing steering column structure proposed in this utility model.

[0013] Figure 3 This is a schematic diagram of the nylon cable sleeve structure of the dual-bearing steering column structure proposed in this utility model.

[0014] Figure 4 This is a schematic diagram of the upper column assembly structure of the dual-bearing steering column structure proposed in this utility model.

[0015] Figure 5 This is a schematic diagram of the lower column assembly structure of the dual-bearing steering column structure proposed in this utility model.

[0016] Figure 6 This is a schematic diagram of the overall structure of the dual-bearing steering column structure proposed in this utility model.

[0017] In the diagram: 1. Steering shaft; 2. Nylon cable sleeve; 3. Upper column assembly; 31. Short round steel; 32. Fixed bracket; 4. Lower column assembly; 41. Long round steel; 42. Base; 43. Limit bracket; 44. Upper cover bracket; 45. Lower cover bracket; 46. Angle adjustment bracket; 5. Deep groove ball bearing; 6. Thrust ball bearing; 7. Retaining ring; 8. Combination bolt. Detailed Implementation

[0018] Reference Figure 1-6The dual-bearing steering column structure includes a lower column assembly 4, a deep groove ball bearing 5 fixed to the inner top of the lower column assembly 4, a thrust ball bearing 6 fixed to the inner bottom of the lower column assembly 4, the inner rings of the deep groove ball bearing 5 and the thrust ball bearing 6 are jointly fitted and fixed to the steering shaft 1, an upper column assembly 3 is fixed to the top of the lower column assembly 4, a nylon sleeve 2 is fitted to the top of the upper column assembly 3, and the nylon sleeve 2 is fitted onto the surface of the steering shaft 1; The lower tube column assembly 4 includes a long round steel bar 41, a base 42 fixed to the bottom of the long round steel bar 41, an upper cover bracket 44 fixed to the top of the long round steel bar 41, a limit bracket 43 fixed to the surface of the upper cover bracket 44, a lower cover bracket 45 fixed to the surface of the long round steel bar 41, and an angle adjustment bracket 46 fixed to the surface of the long round steel bar 41 and below the lower cover. The lower tube column assembly 4 is a welded component consisting of a precision-machined long steel pipe, a limit bracket 43, an upper cover bracket 44, and a lower cover bracket. The frame 45, angle adjustment bracket 46, and base 42 are welded together; the upper end of the long steel pipe is equipped with a deep groove ball bearing 5 to radially limit the steering shaft 1, and the lower end is welded to the base 42, which is hinged to the vehicle body by bolts; the base 42 is equipped with a thrust ball bearing 6 inside to axially limit the steering shaft 1; the upper cover bracket 44 and lower cover bracket 45 are used for the assembly of the cover parts; the angle adjustment bracket 46 can adjust the angle of the column within a certain range through a locking structure and hinged base 42; The upper tube column assembly 3 includes a short round steel bar 31, and a fixed bracket 32 ​​is fixed at the bottom of the short round steel bar 31. The upper tube column assembly 3 is a welded part, which is welded from a precision-machined short steel pipe and a bracket. The upper end of the steel pipe is used for the assembly of the nylon wire sleeve 2, and the lower end is inserted into the lower tube column assembly 4 and fixed to the lower tube column assembly 4 through the bracket and the combination bolt 8.

[0019] Steering shaft 1 is a precision-machined part. Its upper end is fixed to the steering wheel, and its lower end is connected to the steering gear. It is used to transmit the steering force applied by the driver to the steering wheel, thereby realizing the steering action of the wheels. The fixed bracket 32 ​​is fixed to the surface of the upper cover bracket 44, and the fixed bracket 32 ​​and the upper cover are fixed with a combination bolt 8.

[0020] The base 42 has a first mounting groove for mounting the thrust ball bearing 6 inside, and the bottom of the steering shaft 1 has a first mating groove.

[0021] The inner top of the long round steel 41 is provided with a second mounting groove for assembling the deep groove ball bearing 5, and the surface of the steering shaft 1 is provided with a second mating groove.

[0022] Both the deep groove ball bearing 5 and the thrust ball bearing 6 are fitted with retaining rings 7 at their assembly points. The retaining rings 7 are used for axial positioning of the deep groove ball bearing 5 and the thrust ball bearing 6.

[0023] The outer surface of the nylon cable sleeve 2 mates with the inner surface of the short round steel 31, and the inner surface of the nylon cable sleeve 2 mates with the outer surface of the steering shaft 1. The top of the nylon cable sleeve 2 is provided with an annular boss. The nylon cable sleeve 2 is an electrical component, made entirely of nylon, with notches and grooves on its surface for arranging wiring. It covers the upper end of the upper column assembly 3, with copper sheets on the upper surface and wiring layout inside. When the steering wheel horn is pressed, the wiring is connected and the horn sounds.

[0024] When using this device, the lower column assembly 4, bearings, steering shaft 1, upper column assembly 3, and nylon sleeve 2 are assembled to complete the dual-bearing steering column structure assembly. In this structure, the lower end of the steering shaft 1 is axially positioned by a thrust ball bearing 6, and the upper end is radially limited by a deep groove ball bearing 5. The steering shaft 1 is reliably positioned, rotates smoothly, and avoids localized excessive wear and shaking problems.

Claims

1. A dual-bearing steering column structure, characterized in that: The system includes a lower column assembly, a deep groove ball bearing fixed to the inner top of the lower column assembly, a thrust ball bearing fixed to the inner bottom of the lower column assembly, a steering shaft being fixedly fitted together with the inner rings of the deep groove ball bearing and the thrust ball bearing, an upper column assembly fixed to the top of the lower column assembly, and a nylon sleeve fitted to the top of the upper column assembly, which is also fitted onto the surface of the steering shaft. The lower tube column assembly includes a long round steel bar, a base is fixed to the bottom of the long round steel bar, an upper cover bracket is fixed to the top of the long round steel bar, a limit bracket is fixed to the surface of the upper cover bracket, a lower cover bracket is fixed to the surface of the long round steel bar, and an angle adjustment bracket is fixed to the surface of the long round steel bar and below the lower cover. The upper tubular column assembly includes a short round steel bar, and a fixing bracket is fixed to the bottom of the short round steel bar.

2. The dual-bearing steering column structure according to claim 1, characterized in that: The fixing bracket is fixed to the surface of the upper cover bracket, and a combination bolt is used to fix the fixing bracket and the upper cover.

3. The dual-bearing steering column structure according to claim 1, characterized in that: The base has a first mounting groove for assembling the thrust ball bearing, and the bottom of the steering shaft has a first mating groove.

4. The dual-bearing steering column structure according to claim 1, characterized in that: The inner top of the long round steel bar is provided with a second mounting groove for assembling the deep groove ball bearing, and the surface of the steering shaft is provided with a second mating groove.

5. The dual-bearing steering column structure according to claim 1, characterized in that: Both the deep groove ball bearing and the thrust ball bearing are fitted with retaining rings at their assembly points.

6. The dual-bearing steering column structure according to claim 1, characterized in that: The outer surface of the nylon sleeve mates with the inner surface of the short round steel, the inner surface of the nylon sleeve mates with the outer surface of the steering shaft, and an annular boss is provided on the top of the nylon sleeve.

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