Telescopic shaft with labyrinth type dustproof exhaust structure

Abstract

The invention discloses a telescopic shaft with a labyrinth type dustproof exhaust structure, and relates to the technical field of steering transmission systems of commercial vehicles. The telescopic shaft main body comprises a raceway sleeve; the labyrinth type dustproof exhaust cover is connected with the framework oil seal and is in close fit with the roller way sleeve, a main exhaust groove communicated with the exhaust hole of the roller way sleeve is formed in the labyrinth type dustproof exhaust cover in the circumferential direction, and a plurality of branch exhaust grooves are evenly distributed in the main exhaust groove in the direction away from the framework oil seal. By arranging the labyrinth type dustproof exhaust structure, air in the cavity can be quickly exhausted or sucked through the exhaust holes in the roller way sleeve, the main exhaust groove and the branch exhaust grooves in the labyrinth type dustproof exhaust cover, so that the telescopic shaft can be quickly exhausted, and abnormal sound and shaking are avoided; during air suction, the broken line type branch exhaust grooves and the dust storage grooves can intercept most dust, the dust is discharged during air exhaust, dust entering and evaporation of internal lubricating grease are reduced, and the service life of the telescopic shaft under severe working conditions is prolonged.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle steering transmission system technology, specifically a telescopic shaft with a labyrinth-type dustproof and exhaust structure. Background Technology

[0002] Ball-type telescopic shafts used in commercial vehicles are mainly applied to steering systems, featuring high precision and low wear. Structurally, they generally employ ball spline shaft technology, with an internal key inside the shaft and an external key outside, with two sets of balls distributed between them. The balls roll during shaft extension and retraction, reducing friction and wear.

[0003] Currently, there are two types of ball-bearing telescopic shafts used in commercial vehicles: one type has no exhaust structure, which slowly exhausts air over a long period of time. When the vibration amplitude of the cab is too large, it is easy to cause untimely exhaust, impacting the steering wheel and producing abnormal noise and vibration; the other type has an exhaust port, which exhausts air quickly. However, the exhaust port is directly connected to the outside world, and dust will be drawn in through the exhaust port during driving. The lubricating grease will also evaporate. In harsh working conditions such as mines and coal yards, abnormal wear is likely to occur, resulting in looseness and abnormal noise.

[0004] Therefore, we propose a telescopic shaft with a labyrinthine dustproof and exhaust structure to solve the problems mentioned above.

[0005] The information disclosed above in this background section is only for enhancing the understanding of the background section of this invention, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a telescopic shaft with a labyrinth-type dustproof and exhaust structure to solve the problems of steering wheel vibration and impact caused by poor exhaust due to overly good sealing of current ball-type telescopic shafts, as well as the problems of abnormal wear caused by dust being sucked into the interior due to open exhaust holes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a telescopic shaft with a labyrinthine dustproof and exhaust structure, comprising a telescopic shaft body, wherein the telescopic shaft body includes:

[0008] A raceway sleeve, on which a skeleton oil seal is fitted, a ball bearing is provided inside the raceway sleeve, and a steel ball is provided between the outer wall of the ball bearing and the inner wall of the raceway sleeve.

[0009] A labyrinth-style dustproof and exhaust cover is connected to the skeleton oil seal and tightly fitted with the raceway sleeve. The labyrinth-style dustproof and exhaust cover has a main exhaust groove that communicates with the exhaust holes of the raceway sleeve in the internal circumferential direction. The main exhaust groove has multiple branch exhaust grooves evenly distributed in the direction away from the skeleton oil seal. The branch exhaust grooves are arranged in a zigzag pattern, and dust storage grooves are opened at the corners of the branch exhaust grooves.

[0010] Preferably, the steel ball is fitted with a cage.

[0011] Preferably, the ball bearing shaft is provided with a first retaining ring and a second retaining ring at both ends, and the steel ball is located between the first retaining ring and the second retaining ring.

[0012] Preferably, the extension direction of the dust storage tank at the corner of the branch exhaust trough is consistent with the airflow direction when the branch exhaust trough is drawing in air.

[0013] Preferably, it also includes a first universal joint fork connected to one end of the raceway sleeve, the first universal joint fork being connected to a second universal joint fork via a cross shaft, the second universal joint fork being fitted with a first connecting bolt, and the first connecting bolt being fitted with a lock nut.

[0014] Preferably, it also includes a third universal joint fork connected to the other end of the raceway sleeve. The third universal joint fork is connected to the fourth universal joint fork via a cross shaft. A second connecting bolt is installed on the fourth universal joint fork, and the second connecting bolt is fitted with a spring washer and a flat nut.

[0015] The axes of the first universal joint fork and the third universal joint fork are in the same plane.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention features a labyrinthine dustproof and exhaust structure. Air inside the cavity can be quickly discharged or drawn in through the exhaust holes on the raceway sleeve and the main exhaust groove and branch exhaust groove in the labyrinthine dustproof and exhaust cover. This allows the telescopic shaft to exhaust quickly, preventing abnormal noise and vibration. During air intake, the zigzag branch exhaust groove and dust storage groove can trap most of the dust, and during exhaust, the dust is discharged, reducing dust entry and internal grease evaporation, thus extending the service life of the telescopic shaft under harsh working conditions.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the labyrinth-type dustproof exhaust cover of the present invention;

[0021] Figure 3 This is a schematic diagram showing the unfolded internal structure of the labyrinth-type dustproof exhaust cover of the present invention;

[0022] Figure 4 This is a side-view perspective diagram of the labyrinth-type dustproof exhaust cover of the present invention.

[0023] In the figure: 1. First connecting bolt; 2. Locking nut; 3. Second universal joint fork; 4. Cross shaft; 5. First universal joint fork; 6. Skeleton oil seal; 7. O-ring seal; 8. O-ring skeleton; 9. Labyrinth dust-proof exhaust cover; 91. Main exhaust groove; 92. Branch exhaust groove; 93. Dust storage groove; 10. First retaining ring; 11. Steel ball; 12. Cage; 13. Second retaining ring; 14. Third universal joint fork; 15. Raceway sleeve; 16. Ball shaft; 17. Second connecting bolt; 18. Spring washer; 19. Flat nut; 20. Fourth universal joint fork. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] Please refer to Figure 1 - Figure 4 , a telescopic shaft with a labyrinth dust-proof exhaust structure, including a telescopic shaft main body. The telescopic shaft main body includes a raceway sleeve 15 and a labyrinth dust-proof exhaust cover 9, and further includes a first universal joint fork 5 connected to one end of the raceway sleeve 15 and a third universal joint fork 14 connected to the other end of the raceway sleeve 15.

[0027] A skeleton oil seal 6 is sleeved on the raceway sleeve 15. A ball shaft 16 is arranged inside the raceway sleeve 15, and steel balls 11 are arranged between the outer wall of the ball shaft 16 and the inner wall of the raceway sleeve 15.

[0028] Specifically, an O-ring seal 7 and an O-ring skeleton 8 are fitted inside the skeleton oil seal 6.

[0029] Specifically, the steel balls 11 are fitted with a cage 12. The steel balls 11 are in rolling fit with the ball shaft 16.

[0030] Specifically, first retaining rings 10 and second retaining rings 13 are arranged at both ends of the ball shaft 16, and the steel balls 11 are located between the first retaining rings 10 and the second retaining rings 13.

[0031] The labyrinth dust-proof exhaust cover 9 is connected to the skeleton oil seal 6 and is closely fitted with the raceway sleeve 15. A main exhaust groove 91 communicating with the exhaust holes of the raceway sleeve 15 is circumferentially arranged inside the labyrinth dust-proof exhaust cover 9. A plurality of branch exhaust grooves 92 are evenly distributed in a direction away from the skeleton oil seal 6. The branch exhaust grooves 92 are arranged in a broken line and are in a "ji" shape. Dust storage grooves 93 are opened at the corners of the branch exhaust grooves 92.

[0032] Specifically, the labyrinth-style dustproof exhaust cover 9 is made of nylon. Inside the labyrinth-style dustproof exhaust cover 9, there is one main exhaust channel 91 and eight evenly distributed branch exhaust channels 92.

[0033] Specifically, the extension direction of the dust storage tank 93 at the corner of the branch exhaust trough 92 is consistent with the airflow direction when the branch exhaust trough 92 is drawing in air.

[0034] The first universal joint fork 5 is connected to the second universal joint fork 3 via the cross shaft 4. The second universal joint fork 3 is equipped with a first connecting bolt 1, which is fitted with a lock nut 2.

[0035] The third universal joint fork 14 is connected to the fourth universal joint fork 20 via the cross shaft 4. The fourth universal joint fork 20 is equipped with a second connecting bolt 17, which is fitted with a spring washer 18 and a flat nut 19. The axes of the first universal joint fork 5 and the third universal joint fork 14 are in the same plane.

[0036] The working principle of this embodiment:

[0037] When the vehicle is in motion, the cab bounces up and down. The sealed cavity, composed of the skeleton oil seal 6, O-ring seal 7, O-ring skeleton, raceway sleeve 15, and ball shaft 16, experiences pressure fluctuations due to the up-and-down movement of the ball shaft 16 compressing the internal gas. After the gas is compressed, the air in the cavity can be quickly discharged or drawn in through the exhaust hole on the raceway sleeve 15 and through the main exhaust groove 91 and branch exhaust groove 92 in the labyrinth-type dustproof exhaust cover 9. When drawing in air, the zigzag-shaped branch exhaust groove 92 and dust storage groove 93 can trap most of the dust, and when exhausting air, the dust is discharged. This reduces the entry of dust and impurities and the evaporation of internal lubricating grease, thus extending the service life of the telescopic shaft under harsh working conditions.

[0038] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made by those skilled in the art to the above embodiments within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic shaft with a labyrinth-type dustproof and exhaust structure, comprising a telescopic shaft body, characterized in that, The telescopic shaft body includes: A raceway sleeve (15) is provided with a skeleton oil seal (6), a ball bearing (16) is provided inside the raceway sleeve (15), and a steel ball (11) is provided between the outer wall of the ball bearing (16) and the inner wall of the raceway sleeve (15). A labyrinth-type dustproof exhaust cover (9) is connected to the skeleton oil seal (6) and tightly fitted with the raceway sleeve (15). The labyrinth-type dustproof exhaust cover (9) has a main exhaust groove (91) that communicates with the exhaust hole of the raceway sleeve (15) in the circumferential direction. The main exhaust groove (91) has multiple branch exhaust grooves (92) evenly distributed in the direction away from the skeleton oil seal (6). The branch exhaust grooves (92) are arranged in a zigzag pattern. A dust storage groove (93) is opened at the corner of the branch exhaust groove (92).

2. The telescopic shaft with a labyrinth-type dustproof and exhaust structure according to claim 1, characterized in that: The skeleton oil seal (6) is fitted with an O-ring (7) and an O-ring skeleton (8).

3. The telescopic shaft with a labyrinth-type dustproof and exhaust structure according to claim 1, characterized in that: The steel ball (11) is fitted with a retainer (12).

4. The telescopic shaft with a labyrinth-type dustproof and exhaust structure according to claim 1, characterized in that: The ball bearing shaft (16) is provided with a first retaining ring (10) and a second retaining ring (13) at both ends, and the steel ball (11) is located between the first retaining ring (10) and the second retaining ring (13).

5. A telescopic shaft with a labyrinth-type dustproof and exhaust structure according to claim 1, characterized in that: The extension direction of the dust storage tank (93) at the corner of the branch exhaust trough (92) is consistent with the airflow direction when the branch exhaust trough (92) is drawing in air.

6. A telescopic shaft with a labyrinthine dustproof and exhaust structure according to claim 1, characterized in that: It also includes a first universal joint fork (5) connected to one end of the raceway sleeve (15), the first universal joint fork (5) being connected to a second universal joint fork (3) via a cross shaft (4), the second universal joint fork (3) being fitted with a first connecting bolt (1), and the first connecting bolt (1) being fitted with a lock nut (2).

7. A telescopic shaft with a labyrinthine dustproof and exhaust structure according to claim 6, characterized in that: It also includes a third universal joint fork (14) connected to the other end of the raceway sleeve (15), the third universal joint fork (14) being connected to a fourth universal joint fork (20) via a cross shaft (4), a second connecting bolt (17) being installed on the fourth universal joint fork (20), and the second connecting bolt (17) being fitted with a spring washer (18) and a flat nut (19).

8. A telescopic shaft with a labyrinth-type dustproof and exhaust structure according to claim 7, characterized in that: The axes of the first universal joint fork (5) and the third universal joint fork (14) are in the same plane.

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