Conductive semi-rigid bearing for automobile steering column system

Abstract

The utility model discloses a conductive semi-rigid bearing for an automobile steering column system, which comprises an outer ring, an inner ring, a retainer, a plurality of rolling bodies, an inner housing and a wave-shaped spring piece, the two ends of the inner housing are flanged outwards to form a left flanged surface and a right flanged surface respectively; the inner ring comprises a left inner ring body and a right inner ring body, the left inner ring body is tightly attached to the left flanging face of the inner housing, the right inner ring body is connected with the right flanging face through a wave-shaped spring piece, and the wave-shaped spring piece is in a compressed state. The left inner ring and the right inner ring are respectively provided with a left raceway and a right raceway, the outer ring is provided with an outer ring R arc, and the outer ring R arc, the left raceway and the right raceway form a raceway of the rolling body. The utility model has the advantages of simple structure, high production efficiency, low requirement on the matching precision of the steering tube and the steering mandrel, good assembly adaptability, and capability of flexibly adjusting the internal pre-tightening force by the wave spring, so that the bearing is in a gapless state, and the noise, vibration and clamping stagnation phenomena of a steering system are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a conductive semi-rigid bearing used for an automobile steering column system. Background Art

[0002] The automobile steering column system is required to be in a gap-free working state for a long time. When subjected to axial and radial forces, the steering column bearing is not allowed to have obvious shaking. In addition, during the actual production process of the automobile steering column, there will be a certain degree of "misalignment" between the upper and lower columns. Therefore, the steering column bearing is required to have a certain degree of self-aligning ability so that when the inner and outer rings of the bearing are misaligned, the bearing friction torque will not increase sharply. At present, ordinary deep groove ball bearings are used to support the steering column, which is prone to loosening or sticking during the assembly process. In addition, the deep groove ball bearing mainly bears radial forces, and there is rigid contact between the rolling elements and the inner and outer ring raceways, with poor stability. During the operation of the bearing, the steering system is prone to looseness or noise, making it difficult to meet the special requirements of the steering column bearing such as "no gap", "low friction", "high rigidity" and "low noise". Utility Model Content

[0003] The utility model aims to provide a conductive semi-rigid bearing for an automobile steering column system, reduce the matching accuracy requirements of the steering tube and the steering spindle, improve assembly adaptability, and reduce the noise, vibration, and jamming of the steering system.

[0004] The technical solution of the utility model is:

[0005] A conductive semi-rigid bearing for a steering column system of an automobile, comprising an outer ring, an inner ring, a retaining frame and a plurality of rolling elements, an inner cover shell and a wave spring sheet;

[0006] The inner cover shell is arranged on the inner side of the inner ring, and the two ends of the inner cover shell are turned outward to form a left turn-over surface and a right turn-over surface respectively; the inner ring includes a left inner ring and a right inner ring, wherein the left inner ring is in close contact with the left turn-over surface of the inner cover shell, and the right inner ring is connected with the right turn-over surface through a wave spring sheet, and the wave spring sheet is in a compressed state;

[0007] The left inner ring and the right inner ring are respectively provided with a left raceway and a right raceway, and the outer ring is provided with an outer ring R arc. The outer ring R arc and the left raceway and the right raceway constitute the raceways of the rolling bodies, and the rolling bodies are respectively embedded in the pockets of the cage.

[0008] Preferably, the inner cover shell has two stepped planes, the left inner ring and the right inner ring are respectively located on the two stepped planes, a gap is left between the left inner ring and the right inner ring, and a gap is formed between the right inner ring and the stepped plane.

[0009] Preferably, the groove curvature radius coefficient adopted by the outer ring R arc on the outer ring is 0.57~0.65.

[0010] Preferably, the raceway generatrix of the left raceway and the right raceway is an oblique straight line.

[0011] Preferably, the rolling element is in point contact with the outer ring R arc, the left raceway, and the right raceway respectively.

[0012] Preferably, the retaining frame is injection molded and includes a plurality of pockets, and each rolling body is respectively embedded in each pocket and evenly distributed between the raceways.

[0013] Preferably, the inner cover shell adjusts the compression amount of the wave spring sheet by controlling the distance between the left flange surface and the right flange surface.

[0014] Preferably, the left inner ring and the right inner ring are formed by stamping.

[0015] Preferably, the inner cover shell is stamped.

[0016] The advantages of the utility model are:

[0017] 1. Compared with traditional deep groove ball bearings, the conductive semi-rigid bearing of the utility model has a simple structure and high production efficiency. At the same time, it has low requirements on the matching accuracy of the steering tube and the steering core shaft and has good assembly adaptability. The bearing can flexibly adjust the internal preload force by the wave spring, so that the bearing is in a gap-free state, effectively reducing the noise, vibration and jamming of the steering system. After long-term use, the steering wheel can still maintain smooth rotation without abnormal shaking and jamming, and without abnormal noise.

[0018] 2. The raceway generatrix of the left and right inner rings of the utility model is an oblique straight line rather than an arc, which is simple to process and convenient for quality control. The raceway composed of the two inclined raceways and the R-arc shape of the outer ring makes the rolling element present a "three-point contact" state, which can withstand bidirectional axial force and radial force at the same time, and improves the impact resistance of the steering column bearing compared with the traditional deep groove ball bearing.

[0019] 3. The structure of the utility model has certain electrical conductivity, and the steering tube bearing has lower resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a cross-sectional schematic diagram of the conductive semi-rigid bearing of the utility model;

[0022] Figure 2 It is a partial contact schematic diagram of the conductive semi-rigid bearing of the utility model. DETAILED DESCRIPTION

[0023] like Figure 1 , 2 As shown, the conductive semi-rigid bearing for the steering column system of the automobile of the utility model comprises an outer ring 1, an inner ring 2, an inner cover 3, a wave spring sheet 4, a cage 5 and a plurality of rolling bodies 6, wherein the outer ring 1 is formed by solid machining, the inner ring 2 is formed by stamping, and is divided into a left inner ring 2-1 and a right inner ring 2-2, the left inner ring 2-1 and the right inner ring 2-2 are separated by a certain gap, the left inner ring 2-1 and the right inner ring 2-2 are respectively provided with a left raceway 16-1 and a right raceway 16-2, the outer ring is provided with an outer ring R arc 15, the outer ring R arc 15 and the left raceway 16-1 and the right raceway 16-2 constitute the raceway of the rolling body 6, and the rolling body 6 is in the injection molded cage 5. The cage 5 comprises a plurality of pockets, and the rolling bodies 6 are respectively embedded in the pockets and evenly distributed between the raceways.

[0024] The inner cover shell 3 is formed by stamping and arranged inside the inner ring 2. The two ends of the inner cover shell 3 are turned outward to form a left turn-over surface 8 and a right turn-over surface 10 respectively. The left inner ring 2-1 of the inner ring is in close contact with the left turn-over surface 8 of the inner cover shell 3, and the right inner ring 2-2 is connected to the right turn-over surface 10 through a wave spring sheet 4, and the wave crest of the wave spring sheet 4 is in close contact with the side of the right inner ring 2-2. The wave spring sheet 4 is in a certain degree of compression state, and the elastic force generated by the compression of the wave spring sheet 4 realizes the pre-tightening of the inside of the bearing, so that the bearing is always kept under a certain pre-tightening force, and the left inner ring 2-1 and the right inner ring 2-2 are symmetrically distributed along the center line of the rolling body 6. In actual production, the contraction amount of the wave spring sheet 4 can be adjusted by controlling the distance between the left turn-over surface 8 and the right turn-over surface 10, so as to realize the adjustment of the initial pre-tightening force in the bearing, which has the characteristics of good adaptability and a large adjustment range.

[0025] The outer ring 1 adopts a large raceway R arc structure, that is, a larger groove curvature radius coefficient of 0.57-0.65 is adopted, so as to improve the self-aligning ability inside the bearing, and can work normally without being damaged even when the shaft is misaligned.

[0026] During specific operation, the wave spring 4 provides the required preload force inside the bearing and presses the movable right inner ring 2-2 against the rolling element 6 of the bearing. From the transmission of internal force in the bearing, it can be seen that the rolling element 6 will be simultaneously pressed against the R arc 15, the left raceway 16-1, and the right raceway 16-2, forming three contact points: the upper contact point 7, the left contact point 8-1, and the right contact point 8-2, that is, it is in a "three-point contact" state, thereby achieving no gap inside the bearing, the bearing is in a negative clearance state, and can withstand bidirectional axial force and radial force at the same time, thereby improving the operating performance of the bearing under reciprocating cyclic loads.

[0027] The surface of the inner cover shell 3 adopts a stepped structure, including a left stepped plane 11 and a right stepped plane 12. The left inner ring 2-1 and the right inner ring 2-2 are respectively located on the left stepped plane 11 and the right stepped plane 12. A gap 13 is formed between the right inner ring 2-2 and the right stepped plane 12, which together with the large R-arc structure of the outer ring raceway increases the adjustment ability inside the bearing and improves the bearing's ability to operate stably in the event of "misalignment".

[0028] Another advantageous improvement of the present invention is that the generatrix of the left raceway 16-1 and the right raceway 16-2 on the left inner ring 2-1 and the right inner ring 2-2 is an oblique straight line rather than an arc, which makes processing simple and facilitates quality control. The raceway composed of the two inclined raceways and the R arc 15 of the outer ring makes the rolling element present a "three-point contact" state, so it can withstand bidirectional axial force and radial force at the same time, and the impact resistance of the steering column bearing is improved compared with the traditional deep groove ball bearing. In addition, the structure has a certain conductive property, which can realize a steering tube bearing with lower resistance.

[0029] Compared with traditional deep groove ball bearings, the conductive semi-rigid bearing of the utility model has a simple structure and high production efficiency. At the same time, it has low requirements on the matching accuracy of the steering tube and the steering core shaft and has good assembly adaptability. The internal preload force of the bearing can be flexibly adjusted by a wave spring, so that the bearing is in a gap-free state, effectively reducing the noise, vibration and sticking of the steering system. After long-term use, the steering wheel can still maintain smooth and smooth rotation without abnormal shaking or sticking, and without abnormal noise.

[0030] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A conductive semi-rigid bearing for a steering column system of an automobile, comprising an outer ring, an inner ring, a retaining frame and a plurality of rolling elements, characterized in that: Also includes an inner cover shell and a wave spring sheet; The inner cover shell is arranged on the inner side of the inner ring, and the two ends of the inner cover shell are turned outward to form a left turn-over surface and a right turn-over surface respectively; the inner ring includes a left inner ring and a right inner ring, wherein the left inner ring is in close contact with the left turn-over surface of the inner cover shell, and the right inner ring is connected with the right turn-over surface through a wave spring sheet, and the wave spring sheet is in a compressed state; The left inner ring and the right inner ring are respectively provided with a left raceway and a right raceway, and the outer ring is provided with an outer ring R arc. The outer ring R arc and the left raceway and the right raceway constitute the raceways of the rolling bodies, and the rolling bodies are respectively embedded in the pockets of the cage.

2. The conductive semi-rigid bearing for a vehicle steering column system according to claim 1, characterized in that: The inner cover shell has two stepped planes, the left inner ring and the right inner ring are respectively located on the two stepped planes, a gap is left between the left inner ring and the right inner ring, and a gap is formed between the right inner ring and the stepped plane.

3. The conductive semi-rigid bearing for an automobile steering column system according to claim 2, characterized in that: The groove curvature radius coefficient adopted by the outer ring R arc on the outer ring is 0.57~0.

65.

4. The conductive semi-rigid bearing for an automobile steering column system according to claim 3, characterized in that: The raceway generatrix of the left raceway and the right raceway is an oblique straight line.

5. The conductive semi-rigid bearing for an automobile steering column system according to claim 4, characterized in that: The rolling element is in point contact with the outer ring R arc, the left raceway, and the right raceway.

6. The conductive semi-rigid bearing for an automobile steering column system according to claim 1, characterized in that: The cage is injection molded and includes a plurality of pockets, and each rolling body is respectively embedded in each pocket and evenly distributed between the raceways.

7. The conductive semi-rigid bearing for an automobile steering column system according to claim 1, characterized in that: The inner cover shell adjusts the compression amount of the wave spring sheet by controlling the distance between the left flange surface and the right flange surface.

8. The conductive semi-rigid bearing for an automobile steering column system according to claim 1, characterized in that: The left inner ring and the right inner ring are formed by stamping.

9. The conductive semi-rigid bearing for an automobile steering column system according to claim 1, characterized in that: The inner cover shell is formed by stamping.

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