Steering gear and sealing eccentric bearing thereof

Abstract

The sealing eccentric bearing comprises a shaft seat, an outer ring, a retainer and steel balls arranged on the retainer, the retainer is coaxially arranged between the shaft seat and the outer ring, the shaft seat is provided with a through hole, the center line of the through hole and the axis of the shaft seat are not on the same straight line, and the steel balls are arranged on the outer ring. A sealing plate is arranged between the shaft seat and the outer ring, the inner diameter end of the sealing plate is in interference fit with the shaft seat, and the outer diameter end of the sealing plate and the inner wall of the outer ring are pressed together. When the sealing eccentric bearing is applied to a steering gear, scrap iron generated by meshing friction between a worm gear and a worm and between a steering nut and a screw can enter the eccentric bearing, steel balls in the eccentric bearing are clamped, normal operation of the steering gear is further affected, the scrap iron can be prevented from entering the eccentric bearing through the sealing plate, and the service life of the eccentric bearing is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, concretely relates to a steering gear and sealed eccentric bearing thereof. BACKGROUND

[0002] Bearing is an important part in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient in its movement process, and ensure its rotation accuracy. China's bearing industry develops rapidly, the bearing variety from few to many, the product quality and technical level from low to high, the industry scale from small to large, has formed the product category basically complete, production layout is more reasonable professional production system. Eccentric bearing is a very useful bearing type, it can realize eccentric function without eccentric shaft, greatly simplifies the eccentric mechanism. China patent CN97207009.5 discloses an eccentric bearing, although the eccentric bearing is simple to assemble with the shaft, reaches the eccentric purpose, but the eccentric bearing does not have sealing property, cannot avoid the invasion of harmful objects such as dust, iron filings, foreign matters into the bearing interior, thereby affecting the normal operation of the bearing. CONTENT OF THE UTILITY MODEL

[0003] In view of the technical problem that the eccentric bearing in the prior art does not have sealing property, the utility model provides a steering gear and sealed eccentric bearing thereof, the setting of the sealing plate can prevent iron filings from entering the eccentric bearing interior, prolong the service life of the eccentric bearing.

[0004] The technical scheme adopted by the utility model is as follows: a sealed eccentric bearing, including shaft seat, outer ring, retainer and steel ball arranged on the retainer, the retainer is coaxially arranged between the shaft seat and the outer ring, the shaft seat is provided with through hole, the center line of the through hole is not on the same straight line with the axis line of the shaft seat, the sealing plate is arranged between the shaft seat and the outer ring, the inner diameter end of the sealing plate is in interference fit with the shaft seat, and the outer diameter end of the sealing plate is pressed together with the inner wall of the outer ring.

[0005] When the sealed eccentric bearing is applied in the steering gear, the iron filings generated by the meshing friction between the worm gear and the worm, the steering nut and the screw can enter the eccentric bearing, the steel ball in the eccentric bearing is carded, and then the normal operation of the steering gear is affected, the setting of the sealing plate can prevent the iron filings from entering the eccentric bearing interior, prolong the service life of the eccentric bearing.

[0006] Optionally, the outer diameter end of the sealing plate is provided with a first chamfer, and the inner wall of the outer ring is provided with a second chamfer matched with the first chamfer.

[0007] Optionally, the first chamfer and the second chamfer are both arc chamfers.

[0008] Optionally, the angle difference between the first chamfer and the second chamfer is greater than or equal to-3° and less than or equal to 3°.

[0009] The utility model discloses still a kind of diverter, including shell, worm wheel, screw rod, steering nut and the sealed eccentric bearing described above, the number of the sealed eccentric bearing is two, worm wheel, sealed eccentric bearing, steering nut are all set in the outer peripheral wall of screw rod, the worm wheel and steering nut are all located between two sealed eccentric bearings, worm wheel, screw rod, steering nut, sealed eccentric bearing are all located inside shell.

[0010] Optionally, the outer ring of the sealed eccentric bearing is provided with an adjusting hole, the adjusting hole of one of the sealed eccentric bearings is arranged on the same axis as the adjusting hole of the other sealed eccentric bearing, and at the beginning of assembly, the small diameter of the two sealed eccentric bearings is directed to the top of the shell.

[0011] Optionally, it further includes a rocker shaft, which is engaged with the steering nut.

[0012] Optionally, the outer peripheral wall of the steering nut is provided with a rack engaged with the fan teeth of the rocker shaft on one side, and the inner peripheral wall of the steering nut is provided with a flat groove for mounting a ball return device and a raceway for rolling of the ball.

[0013] The utility model discloses the beneficial effect is: when sealed eccentric bearing is applied to the inside of diverter, the iron filings generated by meshing friction between worm wheel and worm, steering nut and screw rod can enter eccentric bearing, make the steel ball in eccentric bearing card, and then influence the normal operation of diverter, the setting of sealing plate can prevent iron filings from entering the inside of eccentric bearing, prolong the service life of eccentric bearing. When using, the inner diameter end of sealing plate is first made into interference fit with shaft seat, and then the outer diameter end of sealing plate is pressed into second chamfer through first chamfer, so that sealing plate and outer ring are pressed together. The setting of arc chamfer facilitates the pressing of first chamfer into second chamfer. First chamfer and second chamfer can also be both bevel chamfers. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model discloses a sealed eccentric bearing for the embodiment of the utility model shows a schematic diagram;

[0015] Figure 2 The utility model discloses a sealed eccentric bearing for the embodiment of the utility model shows a sectional view;

[0016] Figure 3 The utility model discloses a diverter for the embodiment of the utility model shows a schematic diagram.

[0017] The marks in each drawing are: 1, sealed eccentric bearing; 11, shaft seat; 12, outer ring; 13, retainer; 14, steel ball; 15, through hole; 16, sealing plate; 161, first chamfer; 17, adjusting hole; 2, shell; 3, worm wheel; 4, screw rod; 5, steering nut; 6, rocker shaft. DETAILED DESCRIPTION

[0018] The application will be further described in detail below with reference to the accompanying drawings and examples.

[0019] As shown in Figure 1 and 2 , the embodiment discloses a sealed eccentric bearing, which comprises a shaft seat 11, an outer ring 12, a retainer 13 and steel balls 14 arranged on the retainer 13, the retainer 13 is coaxially arranged between the shaft seat 11 and the outer ring 12, the shaft seat 11 is provided with a through hole 15, the center line of the through hole 15 is not on the same straight line as the center line of the shaft seat 11, a sealing plate 16 is arranged between the shaft seat 11 and the outer ring 12, the inner diameter end of the sealing plate 16 is in interference fit with the shaft seat 11, and the outer diameter end of the sealing plate 16 is press-fitted with the inner wall of the outer ring 12. When the eccentric bearing is applied to a steering gear, iron filings generated by meshing friction between a worm wheel 3 and a worm and between a steering nut 5 and a screw rod 4 can enter the eccentric bearing, causing the steel balls 14 in the eccentric bearing to be damaged, thereby affecting the normal operation of the steering gear. The arrangement of the sealing plate 16 can prevent the iron filings from entering the inside of the eccentric bearing, thereby prolonging the service life of the eccentric bearing.

[0020] In the embodiment, as shown in Figure 2 , the outer diameter end of the sealing plate 16 is provided with a first chamfer 161, and the inner wall of the outer ring 12 is provided with a second chamfer matched with the first chamfer 161.

[0021] As shown in Figure 1 , the first chamfer 161 and the second chamfer are both arc chamfers. In use, the inner diameter end of the sealing plate 16 is first interference-fitted with the shaft seat 11, and then the outer diameter end of the sealing plate 16 is press-fitted into the second chamfer through the first chamfer 161, so that the sealing plate 16 and the outer ring 12 are press-fitted together. The arrangement of the arc chamfer facilitates the press-fitting of the first chamfer 161 into the second chamfer. The first chamfer 161 and the second chamfer can also be both bevel chamfers.

[0022] In the embodiment, the angle difference between the first chamfer 161 and the second chamfer is greater than or equal to -3° and less than or equal to 3°. In this way, the sealing property between the sealing plate 16 and the outer ring 12 is ensured.

[0023] As shown in Figure 3 , the embodiment also discloses a steering gear, which comprises a housing 2, a worm wheel 3, a screw rod 4, a steering nut 5 and the above-mentioned sealed eccentric bearing 1, the number of the sealed eccentric bearings 1 is two, the worm wheel 3, the sealed eccentric bearing 1 and the steering nut 5 are all sleeved on the outer peripheral wall of the screw rod 4, the worm wheel 3 and the steering nut 5 are both arranged between the two sealed eccentric bearings 1, and the worm wheel 3, the screw rod 4, the steering nut 5 and the sealed eccentric bearing 1 are all arranged inside the housing 2. The sealed eccentric bearing 1 plays a role in stably supporting the worm wheel 3 and the steering nut 5.

[0024] As shown in Figure 2As shown, the outer ring 12 of the sealing eccentric bearing 1 is provided with an adjusting hole 17, one adjusting hole 17 of the sealing eccentric bearing 1 is arranged on the same axis as the adjusting hole 17 of the other sealing eccentric bearing 1, and the small diameter of the two sealing eccentric bearings 1 is towards the top of the housing 2 at the beginning of assembly. By rotating the two rotating sealing eccentric bearings 1 synchronously through the adjusting hole 17, the large diameter of the two sealing eccentric bearings 1 is towards the top of the housing 2, thereby adjusting the radial gap between the steering nut 5 and the housing 2.

[0025] As shown in the drawings, the steering nut 5 is provided with a plurality of teeth arranged on the outer wall of the steering nut 5, and the steering nut 5 is provided with a plurality of grooves arranged on the inner wall of the steering nut 5. Figure 3 As shown, the rocker shaft 6 is engaged with the steering nut 5. One side of the outer wall of the steering nut 5 is provided with a rack engaged with the fan teeth of the rocker shaft 6, and the inner wall of the steering nut 5 is provided with a flat groove for installing a ball return device and a raceway for ball rolling. The raceway on the inner wall of the steering nut 5 and the raceway on the outer wall of the screw rod 4 are correspondingly matched to form a channel for ball rolling, and the ball return device makes the ball roll back and forth in a cycle.

[0026] It can be understood that the above-described specific embodiments are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. Multiple technical solutions in the same embodiment, and multiple technical solutions between different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation, direct or indirect application in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A sealed eccentric bearing, characterized by, The bearing comprises a shaft seat, an outer ring, a retainer and steel balls arranged on the retainer, the retainer is coaxially arranged between the shaft seat and the outer ring, the shaft seat is provided with a through hole, the center line of the through hole is not on the same line as the axis line of the shaft seat, a sealing plate is arranged between the shaft seat and the outer ring, the inner diameter end of the sealing plate is in interference fit with the shaft seat, and the outer diameter end of the sealing plate is press-fitted with the inner wall of the outer ring.

2. The sealed eccentric bearing of claim 1, wherein, The outer diameter end of the sealing plate is provided with a first chamfer, and the inner wall of the outer ring is provided with a second chamfer matched with the first chamfer.

3. The sealed eccentric bearing of claim 2, wherein, The first chamfer and the second chamfer are both arc chamfers.

4. The sealed eccentric bearing of claim 2, wherein, The angle difference between the first chamfer and the second chamfer is greater than or equal to -3° and less than or equal to 3°.

5. A diverter characterized by, The bearing comprises a housing, a worm gear, a screw rod, a steering nut and the sealing eccentric bearing according to any one of claims 1-4, the number of the sealing eccentric bearings is two, the worm gear, the sealing eccentric bearings and the steering nut are sleeved on the outer peripheral wall of the screw rod, the worm gear and the steering nut are arranged between the two sealing eccentric bearings, and the worm gear, the screw rod, the steering nut and the sealing eccentric bearings are arranged in the housing.

6. The diverter of claim 5, wherein, The outer ring of the sealing eccentric bearing is provided with an adjusting hole, one adjusting hole of one sealing eccentric bearing is arranged on the same axis as the adjusting hole of the other sealing eccentric bearing, and the small diameter of the two sealing eccentric bearings is directed to the top of the housing at the beginning of assembly.

7. The diverter of claim 5, wherein, The bearing further comprises a rocker shaft, and the rocker shaft is engaged with the steering nut.

8. The diverter of claim 6, wherein, One side of the outer peripheral wall of the steering nut is provided with a rack engaged with the fan teeth of the rocker shaft, the inner peripheral wall of the steering nut is provided with a flat groove for mounting a ball returning device and a raceway for rolling of the ball.

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