Intermediate shaft sealing structure special for exterior of automobile cab

Abstract

The utility model relates to the technical field of automobile steering systems, in particular to a special intermediate shaft sealing structure outside an automobile cab, which comprises a surrounding type sealing ring, a needle bearing and a universal joint, the surrounding type sealing ring and the needle bearing are mounted at the end of the universal joint from inside to outside, and the surrounding type sealing ring comprises a sealing ring body and a metal framework. A metal framework is embedded in the back face of the sealing ring body, and a first lip edge, a second lip edge and a third lip edge are arranged on the surface of the sealing ring body. Compared with the prior art, the structure of the sealing ring is improved, the metal framework plays a supporting role, after an assembly is loaded, it can be guaranteed that the three lips of the surrounding type sealing ring are completely wrapped and sealed, on the premise that process assembly is not affected, the waterproof sealing performance is improved, and the service life of the sealing ring is prolonged. And the steering clamping stagnation and unsmoothness caused by sealing failure are avoided, so that the driving safety is improved, and the driving experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive steering systems, and specifically relates to a special intermediate shaft sealing structure outside the automotive cockpit. Background Art

[0002] With the development of new energy vehicles, electric vehicles have higher and higher requirements for endurance. To increase the endurance, more batteries need to be arranged in the whole vehicle space. Therefore, the steering system is changed from a rear-mounted layout to a front-mounted layout, and the steering gear is arranged at the front end of the drive shaft to facilitate the arrangement of more batteries to increase the vehicle endurance.

[0003] The main impact of the front-mounted layout on the steering system is the intermediate shaft assembly. Some parts of the intermediate shaft assembly 2 need to be outside the cockpit, such as Figure 1 as shown, below the front bulkhead 1 is all arranged outside the cockpit, and this layout has a great impact on the universal joint assembly 3.

[0004] As Figure 2 shown, the universal joint assembly 3 includes a fixed joint fork 31, a swing joint fork 32, a needle roller bearing 33, a universal joint 34, and a single-lip seal ring 35. The universal joint 34 is connected to the fixed joint fork 31 and the swing joint fork 32 by a needle roller bearing 33, and a single-lip seal ring 35 is provided between the needle roller bearing 33 and the universal joint 34.

[0005] When the vehicle is in the driving state, it needs to frequently turn the direction, and at the same time, it will also be affected by different environments, such as high temperature, low temperature, rain, mud, etc. After the front-mounted layout of the steering system, the sealing requirements are as follows: waterproof grade IPX6, high and low temperature rotary mud experiment, the experimental cycle is 30 cycles or the vehicle service life is 10 years without any situation affecting the function.

[0006] As Figure 3 shown, the existing single-lip seal ring 35 has a structure of a single-lip edge 351, and it cannot meet the sealing requirements outside the cockpit even when compressed to the limit position. Moreover, once the sealing fails, it will cause problems such as steering jamming and inflexibility.

[0007] Therefore, it is necessary to design a special intermediate shaft sealing structure outside the automotive cockpit to improve the sealing performance, solve the problems of steering jamming and inflexibility caused by sealing failure, thereby improving driving safety and driving experience. Summary of the Invention

[0008] The purpose of the utility model is to overcome the deficiencies of the prior art, and provides a special intermediate shaft sealing structure outside the automotive cockpit to improve the sealing performance, solve the problems of steering jamming and inflexibility caused by sealing failure, thereby improving driving safety and driving experience.

[0009] To achieve the above object, the utility model provides a special intermediate shaft sealing structure outside an automotive cockpit, which includes an enclosed sealing ring, a needle roller bearing, and a universal joint. The end of the universal joint is equipped with an enclosed sealing ring and a needle roller bearing from the inside to the outside. The enclosed sealing ring includes a sealing ring body and a metal skeleton. The metal skeleton is embedded on the back of the sealing ring body. The surface of the sealing ring body has lip one, lip two, and lip three. Lip one and lip three are respectively located on the inner and outer circles of the sealing ring body. Lip two is located between lip one and lip three. The height of lip two is greater than the height of lip one and less than the height of lip three. Lip one covers the inner side of the inner ring of the needle roller bearing. Lip two is filled between the inner and outer rings of the needle roller bearing. Lip three covers the outer side of the outer ring of the needle roller bearing. Lip one, lip two, and lip three are in interference fit with the needle roller bearing.

[0010] The surface of the enclosed sealing ring is provided with a zinc-nickel coating.

[0011] Lip one, lip two, and lip three are all ring-shaped structures.

[0012] The interference amounts of lip two and lip three are 1.7 mm and 0.8 mm respectively.

[0013] The compression amount of lip two is 1.9 - 2.5 mm.

[0014] The dimension of lip three of lip three surrounding the needle roller bearing is 1.4 - 2 mm.

[0015] The inner ring of the needle roller bearing is connected to the end of the universal joint, and the outer ring of the needle roller bearing is connected to a fixed joint fork or a swing joint fork.

[0016] Compared with the prior art, the utility model improves the structure of the sealing ring. The metal skeleton plays a supporting role. After the assembly unit is loaded, it can ensure that the three lips of the enclosed sealing ring achieve complete wrapping and sealing. Without affecting the process assembly, it improves the waterproof sealing performance, avoids steering jamming and inflexibility caused by seal failure, and thus improves driving safety and driving experience. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the intermediate shaft assembly arranged in a whole vehicle.

[0018] Figure 2 It is a schematic diagram of the structure of the universal joint assembly.

[0019] Figure 3 It is a cross-sectional view of a single-lip sealing ring in the universal joint assembly of the prior art.

[0020] Figure 4 It is a schematic diagram of the intermediate shaft sealing structure of the utility model.

[0021] Figure 5 Schematic diagram of the installation of the enclosed seal ring, needle roller bearing and universal joint of the present utility model.

[0022] Figure 6 Cross-sectional view of the enclosed seal ring of the present utility model.

[0023] Figure 7 Cross-sectional view after the installation of the enclosed seal ring and needle roller bearing of the present utility model. Specific embodiments

[0024] The present utility model will be further described in conjunction with the accompanying drawings.

[0025] See Figure 4 , Figure 5 , the present utility model is a special intermediate shaft sealing structure outside the car cockpit, including an enclosed seal ring, a needle roller bearing. At the end of the universal joint 34, an enclosed seal ring 36 and a needle roller bearing 33 are installed from the inside to the outside. The inner ring of the needle roller bearing 33 is connected to the end of the universal joint 34, and the outer ring of the needle roller bearing 33 is connected to the fixed joint fork 31 or the swing joint fork 32.

[0026] See Figure 6 , Figure 7 , the enclosed seal ring 36 includes a seal ring body and a metal skeleton 361. The metal skeleton 361 is embedded on the back of the seal ring body. The surface of the seal ring body has a first lip 362, a second lip 363, and a third lip 364. The first lip 362 and the third lip 364 are respectively located on the inner circle and the outer circle of the seal ring body. The second lip 363 is located between the first lip 362 and the third lip 364. The height of the second lip 363 is greater than the height of the first lip 362 and less than the height of the third lip 364. The first lip 362 covers the inner side of the inner ring of the needle roller bearing 33. The second lip 363 fills the space between the inner ring and the outer ring of the needle roller bearing 33. The third lip 364 covers the outer side of the outer ring of the needle roller bearing 33. The first lip 362, the second lip 363, and the third lip 364 are in interference fit with the needle roller bearing 33.

[0027] The surface of the enclosed seal ring 36 is provided with a zinc-nickel coating to meet the application of the enclosed seal ring 36 in a temperature environment below 150 °C.

[0028] In order to ensure the fit between the enclosed seal ring 36 and the inner and outer rings of the needle roller bearing 33, the first lip 362, the second lip 363, and the third lip 364 are all circular structures.

[0029] To ensure a better sealing effect, after measurement, the interference amounts of lip two 363 and lip three 364 are 1.7 mm and 0.8 mm respectively. The compression amount of lip two 363 is 1.9 - 2.5 mm. The size of lip three 364 surrounding the needle roller bearing 33 is 1.4 - 2 mm. The assembly space size of the enclosed seal ring 36 is 2.2 mm.

[0030] Through batch experiments and verification, the intermediate shaft sealing structure of this utility model meets the sealing requirements outside the automotive cockpit.

[0031] Before the experiment, sample heat aging treatment and sample ozone resistance treatment are carried out. Sample heat aging treatment: Place the test piece in an environment of 80 °C for 100 hours; Sample ozone resistance treatment: The ozone concentration is 50×10 -8 , the test temperature is 40 ± 3 °C, the pre - stretch amount is 20%, the placement time is 140 h, specifically in accordance with GB / T 7762 - 2014.

[0032] The experimental process is as follows: The rotation angle is ±720°, the rotation repetition rate is 1.5 HZ, the load is + / -40 Nm, at a rate of 0.5 - 3 L / min, spray muddy water every 5 minutes, the spray time is 10 minutes, the spray time and the non - spray time form a cycle, and the number of cycles is 3000 times. Among them, the muddy water is mixed with 50 g of test dust of class 8 specified in JIS Z 8901 (dust and aerosols for industrial tests) and 1 L of water.

[0033] This utility model improves the structure of the seal ring. The metal skeleton plays a supporting role. After the assembly assembly is loaded, it can ensure that the three lips of the enclosed seal ring achieve complete wrapping and sealing. Without affecting the process assembly, it improves the waterproof sealing performance, avoids steering jamming and non - smoothness caused by seal failure, and thus improves driving safety and driving experience.

Claims

1. A special intermediate shaft sealing structure outside the automotive cockpit, comprising an enclosed sealing ring, a needle bearing, and a universal joint, characterized in that: An end of the universal joint (34) is installed with an enclosed sealing ring (36) and a needle roller bearing (33) from the inside to the outside. The enclosed sealing ring (36) includes a sealing ring body and a metal skeleton (361). The metal skeleton (361) is embedded in the back surface of the sealing ring body. The surface of the sealing ring body has a first lip (362), a second lip (363), and a third lip (364). The first lip (362) and the third lip (364) are respectively located on the inner ring and the outer ring of the sealing ring body. The second lip (363) is located between the first lip (362) and the third lip (364). The height of the second lip (363) is greater than the height of the first lip (362) and less than the height of the third lip (364). The first lip (362) covers the inner side of the inner ring of the needle roller bearing (33). The second lip (363) is filled between the inner ring and the outer ring of the needle roller bearing (33). The third lip (364) covers the outer side of the outer ring of the needle roller bearing (33). The first lip (362), the second lip (363), and the third lip (364) are in interference fit with the needle roller bearing (33).

2. The special intermediate shaft sealing structure outside the vehicle cockpit according to claim 1, characterized in that: The surface of the described enclosed sealing ring (36) is provided with a zinc-nickel coating.

3. The special intermediate shaft sealing structure outside the vehicle cockpit according to claim 1, characterized in that: The first lip (362), the second lip (363), and the third lip (364) are all in a ring-shaped structure.

4. A special intermediate shaft sealing structure outside an automotive cockpit according to claim 1, characterized in that: The interference amounts of the second lip (363) and the third lip (364) are 1.7 mm and 0.8 mm respectively.

5. A special intermediate shaft sealing structure outside an automotive cockpit according to claim 1, characterized in that: The compression amount of the second lip (363) is 1.9 - 2.5 mm.

6. The special intermediate shaft sealing structure outside the automotive cockpit according to claim 1, characterized in that: The dimension of the third lip (364) of the third lip surrounding the needle roller bearing (33) is 1.4 - 2 mm.

7. The special intermediate shaft sealing structure outside the automotive cockpit according to claim 1, characterized in that: The inner ring of the described needle roller bearing (33) is connected to the end of the universal joint (34), and the outer ring of the needle roller bearing (33) is connected to the fixed joint fork (31) or the swing joint fork (32).

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