Steering gear and sealing cover assembly for steering gear

Abstract

The sealing cover assembly comprises an end cover and a connecting pipe with a hollow hole, one end of the connecting pipe is provided with a first extension pipe in clearance fit with the end cover, the other end of the connecting pipe is provided with a second extension pipe used for being tightly connected with a shell, and a breathable waterproof film is arranged in the first extension pipe. A plurality of water flowing grooves are formed in the free end of the first extending pipe in the circumferential direction at intervals, and the breathable waterproof film is flush with the lowest points of the water flowing grooves. The breathable waterproof film effectively prevents liquid water and particulate matter from invading through the directional breathable characteristic of a micropore structure, meanwhile, the pressure difference inside and outside the shell can be effectively balanced, and the failure of the oil seal is avoided. Water isolated by the breathable waterproof film can flow out from the water flowing groove and flow out from a gap between the end cover and the first extension pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steering gear, specifically relates to steering gear and cover assembly for steering gear. BACKGROUND

[0002] In the automobile steering system, steering gear as the core component of the driver steering intention transmission, its internal precision transmission mechanism, such as worm gear, steering screw and sensor, the cleanliness and sealing requirement of working environment is extremely high. However, steering gear is usually arranged in the vicinity of vehicle chassis or wheel compartment, long-term exposure to rainwater splashing, mud erosion and temperature and humidity change, etc. The completely closed shell in the prior art is prone to form negative pressure or positive pressure when temperature difference or altitude change occurs, resulting in deformation of the oil seal of steering gear and even lubricating oil leakage, and the open type pressure relief design is difficult to avoid the reverse invasion of pollutants. UTILITY MODEL CONTENTS

[0003] In view of the above technical problems, the utility model provides a kind of steering gear and cover assembly for steering gear, and the directional ventilation property of the microporous structure of breathable waterproof membrane effectively prevents liquid water and particulate matter from invading, while effectively balancing the pressure difference inside and outside the shell, to prevent oil seal failure.

[0004] The technical scheme adopted by the utility model is as follows: a cover assembly for steering gear, comprising an end cover and a connecting pipe with a hollow hole, the connecting pipe is provided with a first extension pipe in gap cooperation with the end cover at one end, and the other end of the connecting pipe is provided with a second extension pipe for tightly connecting with the shell, and the first extension pipe is provided with a breathable waterproof membrane inside.

[0005] Optionally, the free end of the first extension pipe is provided with a plurality of water grooves in a circumferential direction, and the breathable waterproof membrane is flush with the lowest point of the water grooves.

[0006] Optionally, a plurality of elastic ribs are arranged at intervals on the inner circumferential wall of the end cover, the elastic ribs are arranged in staggered correspondence with the water grooves, the elastic ribs are in interference fit with the outer circumferential wall of the first extension pipe, the outer circumferential wall of the first extension pipe is provided with a ring groove, and the elastic ribs and the ring groove are arranged perpendicular to each other.

[0007] Optionally, the connecting pipe is coaxially provided with a cover plate, the diameter of the cover plate is greater than the diameter of the connecting pipe, and the bottom surface of the cover plate is provided with an elastic ring protrusion for abutting against the shell.

[0008] Optionally, the inner diameter of the hollow hole of the connecting pipe is 8-9cm.

[0009] Optionally, a plurality of edges are arranged at intervals on the outer circumferential wall of the connecting pipe in the axial direction.

[0010] The utility model discloses still disclose a kind of diverters, including shell and the cover assembly for diverter described above, the shell is equipped with with the second extension pipe closely connected oil inlet pipeline.Oil inlet pipeline in prior art is generally sealed with nut, and it is prone to cause shell internal and external air pressure imbalance.In this embodiment, the cover assembly for diverter is used instead of nut, to maintain the pressure balance inside and outside the diverter on the basis of waterproof and dustproof.

[0011] Optionally, the connecting pipe is coaxially provided with a cover plate, the bottom surface of the cover plate is provided with an elastic ring protrusion, the free end of the oil inlet pipeline is provided with a limiting groove matched with the elastic ring protrusion, the outer circumferential wall of the second extension pipe is provided with external threads, and the oil inlet pipeline is provided with internal threads matched with the external threads.

[0012] The utility model discloses the beneficial effect is: the water -proof membrane of ventilation passes through the directional ventilation characteristic of its micropore structure, effectively blocks liquid water and particulate matter invasion, can effectively balance the pressure difference inside and outside shell simultaneously, avoids oil seal failure. Water isolated by the water -proof membrane of ventilation can flow out from the water channel, and go out by the gap between end cover and first extension pipe. The end cover is matched by the elastic protrusion of inner circumferential wall and the outer circumferential wall of first extension pipe, and water and gas flow out from the gap between the inner circumferential wall of end cover and the outer circumferential wall of first extension pipe, and the setting of annular groove increases the drawing force of end cover, so that end cover is not easy to be pulled out. When first extension pipe and shell are closely matched by external threads and internal threads, the cover plate seals the oil inlet pipeline, and the elastic ring protrusion further plays the effect of sealing. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure diagram of the cover assembly for diverter is provided for the utility model embodiment;

[0014] Figure 2 The schematic diagram of the elastic protrusion of the cover assembly for diverter is provided for the utility model embodiment;

[0015] Figure 3 The sectional view of the cover assembly for diverter is provided for the utility model embodiment;

[0016] Figure 4 The schematic diagram of the oil inlet pipeline of the diverter is provided for the utility model embodiment.

[0017] The marks in each drawing are: 1, end cover;2, connecting pipe;3, first extension pipe;4, second extension pipe;5, water -proof membrane of ventilation;6, water channel;7, elastic protrusion;8, annular groove;9, cover plate;10, elastic ring protrusion;11, edge;12, shell;13, oil inlet pipeline;14, limiting groove;15, external threads;16, internal threads;17, hollow hole. DETAILED DESCRIPTION

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

[0019] As Figures 1 to 3 shown in the drawings, the present embodiment discloses a cover assembly for a diverter, which comprises an end cover 1 and a connecting pipe 2 with a hollow hole 17, the connecting pipe 2 is provided with a first extension pipe 3 at one end which is in clearance fit with the end cover 1, and is provided with a second extension pipe 4 at the other end which is used for tightly connecting with a shell 12, and the first extension pipe 3 is internally provided with a waterproof and breathable membrane 5. The waterproof and breathable membrane 5 effectively prevents liquid water and particles from entering through the directional breathable characteristics of its microporous structure, and can effectively balance the pressure difference between the inside and outside of the shell 12 to avoid oil seal failure.

[0020] In the present embodiment, as Figure 1 shown in the drawings, a plurality of water flow grooves 6 are circumferentially and spaced apart at the free end of the first extension pipe 3, and the lowest point of the waterproof and breathable membrane 5 is flush with the water flow grooves 6. The water isolated by the waterproof and breathable membrane 5 can flow out of the water flow grooves 6 and flow out through the gap between the end cover 1 and the first extension pipe 3.

[0021] As Figure 2 shown in the drawings, a plurality of elastic ribs 7 are spaced apart on the inner circumferential wall of the end cover 1, the elastic ribs 7 correspond to the water flow grooves 6 in an interleaved manner, the elastic ribs 7 are in interference fit with the outer circumferential wall of the first extension pipe 3, the outer circumferential wall of the first extension pipe 3 is provided with a ring groove 8, and the elastic ribs 7 and the ring groove 8 are arranged perpendicularly to each other. The end cover 1 is in interference fit with the outer circumferential wall of the first extension pipe 3 through the elastic ribs 7 on the inner circumferential wall, and water and gas flow out of the gap between the inner circumferential wall of the end cover 1 and the outer circumferential wall of the first extension pipe 3, and the setting of the ring groove 8 increases the pulling force of the end cover 1, so that the end cover 1 is not easily pulled out.

[0022] As Figure 1 shown in the drawings, the connecting pipe 2 is coaxially provided with a cover plate 9, the diameter of the cover plate 9 is greater than that of the connecting pipe 2, and the bottom surface of the cover plate 9 is provided with an elastic ring protrusion 10 which is used for abutting against the shell 12. When the first extension pipe 3 is tightly fitted with the shell 12 through the external thread 15 and the internal thread 16, the cover plate 9 seals the oil inlet pipe 13, and the elastic ring protrusion 10 further plays a sealing effect.

[0023] In the present embodiment, the inner diameter of the hollow hole 17 of the connecting pipe 2 is 8-9 cm. If the diameter of the hollow hole 17 is less than 8 cm, the inner wall of the hollow hole 17 is prone to condensing lubricating oil, which leads to the blockage of the hollow hole 17 and affects the exhaust effect, and if the diameter of the hollow hole 17 is greater than 9 cm, the size of the connecting pipe 2 and the waterproof and breathable membrane 5 also needs to be correspondingly increased, which increases the processing cost.

[0024] As Figure 2As shown, the outer peripheral wall of the connecting pipe 2 is provided with multiple edges 11 spaced apart along the axial direction. The edges 11 are provided to facilitate the operator to twist the connecting pipe 2 in order to remove or install the cap assembly.

[0025] like Figure 3 and 4 As shown, this embodiment also discloses a steering gear, including a housing 12 and the steering gear cover assembly described above. The housing 12 is provided with an oil inlet pipe 13 that is tightly connected to the second extension pipe 4. The oil inlet pipe 13 is used to add lubricating oil to the inside of the steering gear. In the prior art, the oil inlet pipe 13 is generally sealed with a nut, which can easily lead to an imbalance of air pressure inside and outside the housing 12. In this embodiment, the steering gear cover assembly is used instead of a nut, which maintains the pressure balance inside and outside the steering gear while achieving waterproofing and dustproofing. The free end of the oil inlet pipe is provided with a limiting groove 14 that mates with the elastic ring protrusion 10. The outer peripheral wall of the second extension pipe 4 is provided with an external thread 15, and the oil inlet pipe 13 is provided with an internal thread 16 that mates with the external thread 15. When the first extension pipe 3 and the oil inlet pipe 13 are tightly engaged by the external thread 15 and the internal thread 16, the cover plate 9 seals the oil inlet pipe 13, and the elastic ring protrusion 10 further achieves a sealing effect.

[0026] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A cover assembly for a diverter, characterized by, The utility model provides a cover assembly for steering gear, which comprises an end cover and a connecting pipe with a hollow hole, the connecting pipe is provided with a first extension pipe matched with the end cover at one end and a second extension pipe for being tightly connected with a shell at the other end, and a waterproof and breathable membrane is arranged inside the first extension pipe.

2. The cover assembly for a diverter of claim 1, wherein, A plurality of water flow grooves are arranged at the free end of the first extension pipe in a circumferential direction.

3. The cover assembly for a diverter of claim 2, wherein, A plurality of elastic convex strips are arranged at the inner circumferential wall of the end cover in a spaced manner, the elastic convex strips are arranged in an interlaced manner corresponding to the water flow grooves, the elastic convex strips are in interference fit with the outer circumferential wall of the first extension pipe, the outer circumferential wall of the first extension pipe is provided with a ring groove, and the elastic convex strips and the ring groove are arranged in a perpendicular manner.

4. The cover assembly for a diverter of claim 1, wherein, The connecting pipe is coaxially provided with a cover plate, the diameter of the cover plate is greater than that of the connecting pipe, and the bottom surface of the cover plate is provided with an elastic ring convex for abutting against the shell.

5. The cover assembly for a diverter of claim 1, wherein, The inner diameter of the hollow hole of the connecting pipe is 8-9 cm.

6. The cover assembly for a diverter of claim 1, wherein, A plurality of edges are arranged at the outer circumferential wall of the connecting pipe in an axial direction.

7. A diverter characterized by, The utility model provides a cover assembly for steering gear, which comprises an end cover and a connecting pipe with a hollow hole, the connecting pipe is provided with a first extension pipe matched with the end cover at one end and a second extension pipe for being tightly connected with a shell at the other end, and a waterproof and breathable membrane is arranged inside the first extension pipe.

8. The diverter of claim 7, wherein, The connecting pipe is coaxially provided with a cover plate, the bottom surface of the cover plate is provided with an elastic ring convex, the free end of the oil inlet pipeline is provided with a limiting groove matched with the elastic ring convex, the outer circumferential wall of the second extension pipe is provided with an external thread, and the oil inlet pipeline is provided with an internal thread matched with the external thread.

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