CN115973275A - A steering shaft integrated sealing structure - Google Patents

Abstract

The utility model provides a steering spindle integral type seal structure, is provided with a plurality of sealed positions, can realize reliable sealed, is provided with a plurality of oil storage chambeies, can promote maintenance cycle and life-span. The structure is optimized and integrated, the original arrangement space size is not changed, and the installation is simple and convenient. The method can reduce after-sale maintenance cost, prolong the service life of the bushing and the tapered roller thrust bearing, effectively save resources and avoid environmental pollution.

Description

A steering shaft integrated sealing structure

technical field

The invention relates to the field of commercial vehicle manufacturing, in particular to an integral sealing structure of a steering shaft.

Background technique

As the country's environmental protection requirements become more and more stringent, commercial vehicles, especially wading engineering vehicles, have higher and higher requirements for steering shaft seals. Steering shaft kingpin bushings and thrust tapered roller bearings have high requirements on the cleanliness of the frictional contact surfaces. Inadequate sealing, maintenance and lubrication will cause abnormal wear and ablation of the kingpin bushings and thrust tapered roller bearings. Faults such as low life and low service life may cause faults such as tire eating, shaking and deviation of the vehicle, causing losses to customers.

At present, the structure of this position of the steering shaft is mostly an independent seal or a partial seal. Independent sealing structure, kingpin bushing and thrust bearing have their own filling and sealing systems, independent grease nipples, independent of each other, complex structure, high cost, and difficult to assemble. Partial sealing structure, the sealing reliability of the contact between the lower end surface of the thrust bearing and the steering knuckle is not high. Due to the vibration of the steering shaft during operation and the existence of axial clearance, impurities and other pollution may still enter here under complex working conditions. Inside bushings and bearings, causing premature failure.

Contents of the invention

In order to overcome the deficiencies of the above technologies, the present invention provides a steering shaft integrated seal structure that solves the blind spot of the seal and improves reliability and overall performance.

The technical scheme that the present invention overcomes its technical problem adopts is:

An integrated sealing structure for a steering shaft, including a steering knuckle, a front beam, and a king pin arranged on the front beam, and also includes:

The bushing is inserted into the hole of the steering knuckle, and the lower end of the king pin is inserted into the hole of the bushing;

The end cover is installed on the bottom of the steering knuckle through bolts, the end cover seals the bottom of the steering knuckle hole, and a grease nipple is arranged on the end cover;

Thrust tapered roller bearing, the lower end of the seat ring is provided with a boss matching the inner diameter of the steering knuckle hole, the seat ring is inserted into the upper end of the steering knuckle hole through the boss, and the king pin is inserted into the thrust tapered roller In the shaft ring of the bearing, a circular shell is fixed on the periphery of the shaft ring, and the seat ring is located inside the shell;

A closed oil storage chamber I is formed between the end cover and the lower end surface of the main pin. The inner wall of the bush is spirally arranged with an oil passage I from top to bottom. Between the upper end surface of the bush and the lower end surface of the seat ring A closed oil storage chamber II is formed. The lower end of the oil passage I communicates with the oil storage chamber I, and its upper end communicates with the oil storage chamber II. The inner wall of the seat ring is provided with an oil passage II along the vertical direction. The upper end surface of the seat ring , A closed oil storage chamber III is formed between the lower end surface of the shaft ring and the inner wall of the housing, the lower end of the oil passage II communicates with the oil storage chamber II, and the upper end communicates with the oil storage chamber III.

In order to improve the sealing performance, an O-ring I is arranged between the end cover and the hole of the steering knuckle.

In order to adjust the gap, a spacer is also included, the upper end surface of the spacer is in contact with the lower end surface of the front beam, and the lower end surface of the spacer is in contact with the upper end surface of the axle ring.

In order to improve the sealing performance, an O-ring III is arranged between the boss and the hole of the steering knuckle.

In order to improve the sealing performance, an O-ring II is arranged between the shaft ring and the main pin.

In order to improve the sealing performance, it also includes a double-lip one-way seal ring sandwiched between the shaft ring and the seat ring and a single-lip one-way seal ring arranged between the seat ring and the housing, and the outer wall of the double-lip one-way seal ring In contact with the inner wall of the housing, the two one-way lips of the double-lip one-way seal are in contact with the upper surface of the seat ring, and the lips of the one-lip one-way seal are in contact with the inner wall of the housing. .

In order to improve the sealing performance, a closed oil storage chamber IV is formed between the double-lip one-way sealing ring, the single-lip one-way sealing ring and the inner wall of the housing.

The beneficial effects of the invention are: the blind spot of the seal is solved, and the reliability is high; at the same time, the integrated sealing, lubrication and maintenance of the bush and the bearing are considered systematically, the overall performance is improved, and the bush and thrust cone can be reduced. The failure rate of roller bearings improves product quality and life, and greatly reduces the cost of replacement and maintenance for customers.

Description of drawings

Fig. 1 is the front view sectional structure schematic diagram of the present invention;

Fig. 2 is a schematic structural view of the shaft ring and the seat ring of the present invention;

Fig. 3 is a structural schematic diagram of the seat ring part of the present invention;

In the figure, 1. Front beam 2. Steering knuckle 3. King pin 4. Gasket 5. Thrust tapered roller bearing 6. Bushing 7. End cover 8. Grease nipple 9. Bolt 10. O-ring Ⅰ 11. Storage Oil chamber Ⅰ 12. Oil passage Ⅰ 13. Oil storage chamber Ⅱ 14. Oil storage chamber Ⅲ 15. O-ring Ⅱ 16. Double-lip one-way sealing ring 17. Single-lip one-way sealing ring 18. O-ring Ⅲ 19. Oil storage chamber IV 20. Oil passage II 51. Shaft ring 52. Seat ring 53. Housing 521. Boss.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing 1, accompanying drawing 2, accompanying drawing 3.

An integrated sealing structure for a steering shaft, including a steering knuckle 2, a front beam 1, and a kingpin 3 arranged on the front beam 1, and also includes: a bush 6 inserted into the hole of the steering knuckle 2, and the kingpin 3 The lower end is inserted into the hole of the bushing 6; the end cover 7 is installed on the bottom of the steering knuckle 2 through the bolt 9, the end cover 7 seals the bottom of the hole of the steering knuckle 2, and the end cover 7 is provided with a grease nipple 8; the thrust Tapered roller bearing 5, the lower end of its seat ring 52 is provided with a boss 521 matching the inner diameter of the hole of the steering knuckle 2, the seat ring 52 is inserted into the upper end of the hole of the steering knuckle 2 through the boss 521, and the main pin 3 Inserted in the shaft ring 51 of the thrust tapered roller bearing 5, the outer periphery of the shaft ring 51 is fixed with an annular shell 53, and the seat ring 52 is located inside the shell 53; between the end cover 7 and the lower end surface of the main pin 3 A closed oil storage chamber I 11 is formed between them, and an oil passage I 12 is spirally arranged on the inner wall of the bush 6 from top to bottom, and a closed oil storage chamber is formed between the upper end surface of the bush 6 and the lower end surface of the seat ring 52 Oil chamber II 13, the lower end of oil passage I 12 communicates with oil storage chamber I 11, its upper end communicates with oil storage chamber II 13, the inner wall of seat ring 52 is provided with oil passage II 20 along the vertical direction, seat ring 52 A closed oil storage chamber III 14 is formed between the upper end surface of the shaft ring 51 and the inner wall of the housing 53, the lower end of the oil passage II 20 communicates with the oil storage chamber II 13, and its upper end communicates with the oil storage chamber III 14 connected. Grease is injected through the grease nipple 8, firstly into the oil storage chamber Ⅰ11, the grease fills the oil storage chamber Ⅰ 11, then ascends through the spiral oil passage Ⅰ 12 and enters the oil storage chamber Ⅱ 13, and the oil storage chamber Ⅱ 13 is filled with grease Finally, it enters the oil storage chamber III 14 through the oil passage II 20. Preferably, the gap between the main pin 3 and the seat ring 52 is 0.3-0.5 mm. The width of oil passage II 20 is 4mm, and its depth is 0.3mm.

The integrated sealing structure is provided with multiple sealing parts, which can realize reliable sealing, and is provided with multiple oil storage chambers, which can improve the maintenance cycle and service life. The structure is optimized and integrated, the original layout space size is not changed, and the installation is easy. After-sales maintenance costs can be reduced, the service life of the bushing 6 and the thrust tapered roller bearing 5 can be prolonged, resources can be effectively saved, and environmental pollution can be avoided.

In one embodiment of the present invention, an O-ring I 10 is provided between the end cover 7 and the hole of the steering knuckle 2. The O-ring I10 can improve the sealing performance between the end cover 7 and the hole of the steering knuckle 2 .

In one embodiment of the present invention, a spacer 4 is also included, the upper end surface of the spacer 4 is in contact with the lower end surface of the front beam 1 , and the lower end surface of the spacer 4 is in contact with the upper end surface of the collar 51 . The spacer 4 can be used to match the gap between the front beam 1 and the axle ring 51, which improves the convenience of assembly.

In one embodiment of the present invention, an O-ring III 18 is provided between the boss 521 and the hole of the steering knuckle 2. An O-ring II 15 is arranged between the shaft ring 51 and the kingpin 3. The sealing performance between the seat ring 52 and the hole of the steering knuckle 2 can be improved by setting the O-ring III 18, and the sealing performance between the shaft ring 51 and the kingpin 3 can be improved by setting the O-ring II 15.

In one embodiment of the present invention, it also includes a double-lip one-way seal ring 16 sandwiched between the shaft ring 51 and the seat ring 52 and a single-lip one-way seal ring arranged between the seat ring 52 and the housing 53 17. The outer wall of the double-lip one-way sealing ring 16 is in contact with the inner wall of the housing 53, and the outer wall of the single-lip one-way sealing ring 17 is in contact with the inner wall of the housing 53. An airtight oil storage chamber IV 19 is formed between the double-lip one-way seal ring 16, the single-lip one-way seal ring 17 and the inner wall of the housing 53. After a certain pressure is formed in the oil storage chamber III14, the grease overflows along the two one-way lip joints between the seat ring 52 and the double-lip one-way seal ring 16, and enters the oil storage chamber IV19 inside the housing 53. Since the double-lip one-way sealing ring 16 is coated with a layer of sealing material on the outside of its skeleton, the coating material cooperates with the housing 53 after installation to form the oil storage chamber IV 19, preventing grease from flowing in the oil storage chamber IV 19 Spills upwards while preventing external impurities from entering. After the oil storage chamber IV 19 is filled with lubricating grease, the lubricating grease overflows along the junction of the lip of the single-lip one-way sealing ring 17 and the housing 53, and the process of filling the lubricating grease is completed. During after-sales maintenance and maintenance, new grease is gradually injected from the grease nipple 8, and old grease and wear debris are gradually squeezed out from the one-way sealing ring 17, which is convenient and quick to realize the renewal of internal grease without disassembly and maintenance.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. The utility model provides a steering spindle integral type seal structure, includes knuckle (2), front beam (1) and sets up king pin (3) on front beam (1), its characterized in that still includes:

the bushing (6) is inserted into a hole of the steering knuckle (2), and the lower end of the main pin (3) is inserted into a hole of the bushing (6);

the end cover (7) is arranged at the bottom of the steering knuckle (2) through a bolt (9), the end cover (7) seals the bottom of a hole of the steering knuckle (2), and a grease nozzle (8) is arranged on the end cover (7);

the thrust tapered roller bearing (5) is characterized in that a boss (521) matched with the inner diameter of a hole of a steering knuckle (2) is arranged at the lower end of a seat ring (52), the seat ring (52) is inserted into the upper end of the hole of the steering knuckle (2) through the boss (521), a main pin (3) is inserted into a shaft ring (51) of the thrust tapered roller bearing (5), a circular shell (53) is fixed on the periphery of the shaft ring (51), and the seat ring (52) is located inside the shell (53);

a closed oil storage cavity I (11) is formed between the end cover (7) and the lower end face of the main pin (3), an oil channel I (12) is spirally arranged on the inner wall of the bushing (6) in a surrounding mode from top to bottom, a closed oil storage cavity II (13) is formed between the upper end face of the bushing (6) and the lower end face of the seat ring (52), the lower end of the oil channel I (12) is communicated with the oil storage cavity I (11), the upper end of the oil channel I is communicated with the oil storage cavity II (13), an oil channel II (20) is arranged on the inner wall of the seat ring (52) in the vertical direction, a closed oil storage cavity III (14) is formed between the upper end face of the seat ring (52), the lower end face of the shaft ring (51) and the inner wall of the shell (53), the lower end of the oil channel II (20) is communicated with the oil storage cavity II (13), and the upper end of the oil storage cavity III (14) is communicated with the oil storage cavity.

2. The steering shaft integrated seal structure according to claim 1, characterized in that: an O-shaped ring I (10) is arranged between the end cover (7) and the hole of the steering knuckle (2).

3. The steering shaft integrated seal structure according to claim 1, characterized in that: the automobile front frame structure further comprises a gasket (4), the upper end face of the gasket (4) is in contact with the lower end face of the front beam (1), and the lower end face of the gasket (4) is in contact with the upper end face of the shaft ring (51).

4. The steering shaft integrated seal structure according to claim 1, characterized in that: an O-shaped ring III (18) is arranged between the boss (521) and the hole of the steering knuckle (2).

5. The steering shaft integrated seal structure according to claim 1, characterized in that: an O-shaped ring II (15) is arranged between the shaft ring (51) and the main pin (3).

6. The steering shaft integrated seal structure according to claim 1, characterized in that: the one-way sealing ring is characterized by further comprising a double-lip one-way sealing ring (16) clamped between the shaft ring (51) and the seat ring (52) and a single-lip one-way sealing ring (17) arranged between the seat ring (52) and the shell (53), wherein the outer wall of the double-lip one-way sealing ring (16) is in contact with the inner wall of the shell (53), two one-way lips of the double-lip one-way sealing ring (16) are attached to the upper surface of the seat ring (52), and the lip of the single-lip one-way sealing ring (17) is in contact with the inner wall of the shell (53).

7. The steering shaft integrated seal structure according to claim 6, characterized in that: a closed oil storage cavity IV (19) is formed between the double-lip one-way sealing ring (16), the single-lip one-way sealing ring (17) and the inner wall of the shell (53).

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