CN204196602U - Gas circuit structure of central authorities' gassing of filling - Google Patents

Abstract

A gas circuit structure for central inflation and deflation, including a hub, a steering knuckle is installed inside the hub through an inner bearing and an outer bearing, an upper static air passage is arranged inside the steering knuckle, and a rotating hub is arranged inside the hub The air passage, the upper static air passage and the rotating air passage are connected through the transition air passage, and the transition air passage is arranged at the position between the inner bearing and the inner end surface of the hub; the transition air passage is composed of One large and one small two sealing rings are formed by sealing the gap between the hub and the steering knuckle. The utility model has the advantages of reasonable layout, high structural strength of the steering knuckle, simple structure, not easy to damage the airtight parts during disassembly, and long service life.

Description

A gas path structure with central inflation and deflation

technical field

The utility model relates to a vehicle control component, in particular to an air path structure of a central inflation and deflation system for automobile tires.

Background technique

The roads on which commercial vehicles drive are relatively complex and often need to be driven on muddy and soft roads. According to the theory of vehicle ground mechanics, under the condition of certain ground friction coefficient and other conditions, the larger the ground contact area of the tire, the less traction the vehicle can obtain from the ground. bigger. Therefore, by adjusting the tire pressure to change the contact area, it can play a role in changing the traction of the vehicle, thereby improving the passability of the vehicle. In order to inflate and deflate the tires while the vehicle is running, how to control the air path from the stationary vehicle body to the selected wheels is a major technical problem to be solved.

The air path structure widely adopted at present is: the air channel first passes through the fixed steering knuckle, then passes through the gap between the two bearings located between the steering knuckle and the wheel hub, and finally connects to the tire through the wheel hub. The air path structure arranged in this way has the following defects: 1. There are air passages arranged in the force-bearing range of the steering knuckle and the hub bearing, which affects the service life of the steering knuckle; 2. A sealing ring is set between the two bearings, causing the hub, bearing The assembly process of the bearing and the sealing ring is complicated, and the sealing ring is easily damaged during the disassembly, maintenance and repair of the bearing and the sealing ring.

Specifically, the Chinese invention patent shown in Figure 1 and Figure 2 (authorized announcement number: CN 102019820 B, authorized announcement date: April 09, 2014, titled: "A gas circuit structure for a central inflation and deflation system") The disclosed information: an air path structure of a central inflation and deflation system, including a hub 2, a steering knuckle 1 is installed in the hub 2, an end cover 7 is provided on the side end surface of the hub 2, and the connection between the end cover 7 and the steering knuckle 1 is A cavity 8 is formed between the steering knuckle 1 and the hub 2, and the first sealing ring 9 and the second sealing ring 10 are respectively arranged between the steering knuckle 1 and the hub 2. The upper static air passage 4 and the lower static air passage are opened on the steering knuckle 1. 5. There is a rotating air channel 3 on the hub 2, and an air channel outlet 6 on the end cover 7, wherein the rotating air channel 3 and the upper static air channel 4 are connected to the air channel holes on the second sealing ring 10 respectively. connected to form the first airway; the lower static airway 5 and the airway outlet 6 are both connected to the cavity 8 to form the second airway.

Although the above-mentioned invention patent proposes a technical solution in which the steering knuckle does not arrange an air passage at the place where the bearing is stressed, this technical solution is not perfect, and there are still the following defects: 1. The rotating air passage protrudes out of the hub body , the airway pipeline is formed inside the steering bridge outside the hub body. Due to the small space inside the steering bridge, it cannot be used for arranging airway pipelines, and the arrangement of airway pipelines outside the hub body will also affect The dynamic balance of the wheel hub; 2. In order to ensure the strength of the steering knuckle, the distance between the air inlet of the upper static air passage on the steering knuckle and the hub bearing is usually designed to be very small, and there is not enough space to arrange two symmetrical first seals 3. In the process of disassembling the steering knuckle and hub, it is difficult to avoid interference between the inner ring of the bearing and the sealing ring, which may easily damage the sealing ring.

  Contents of the invention

The purpose of this utility model is to solve the shortcomings of the unreasonable layout of the existing central gas path structure, which leads to poor structural strength of the steering knuckle, low service life, complicated assembly and disassembly process, and easy damage to the air-tight parts when the assembly is disassembled. To provide a center with reasonable air path structure layout, high steering knuckle structural strength, long service life, simple assembly and disassembly process, better protection of airtight parts during assembly and disassembly, and better structural compactness of each assembly Inflatable and deflated air path structure.

In order to achieve the above object, the technical solution of the utility model is:

An air circuit structure for central inflation and deflation, including a hub, a steering knuckle is installed inside the hub through an inner bearing and an outer bearing, an upper static air passage is arranged inside the steering knuckle, and a rotating hub is arranged inside the hub The air passage, the upper static air passage and the rotating air passage are connected through the transition air passage, and the transition air passage is formed by separating the gap between the hub and the steering knuckle by the first sealing ring and the second sealing ring, The first sealing ring and the second sealing ring are coaxially arranged in the gap between the hub and the steering knuckle, and are located between the inner bearing and the inner end surface of the hub; the shaft between the first sealing ring and the inner bearing The axial distance from the second sealing ring to the inner bearing is greater than the axial distance;

The upper static air passage extends from the root of the steering knuckle to the position between the first sealing ring placement and the second sealing ring placement on the steering knuckle, and is connected with the transition air passage; The rotating air passage extends from the outer end surface of the hub to the position between the placement of the first sealing ring and the placement of the second sealing ring on the hub, and connects with the transition air passage.

Further, the inner diameter of the first sealing ring is larger than the inner diameter of the second sealing ring, and the outer diameter of the first sealing ring is larger than the outer diameter of the second sealing ring; A step and a second step, the hub is provided with a third step corresponding to the first step, and the hub is provided with a fourth step corresponding to the second step steps;

The first sealing ring is placed in the gap between the first step and the third step, the axial gap between the first step and the third step is smaller than the thickness of the first sealing ring, so The step surface of the first step is in contact with one end surface of the first sealing ring, and the step surface of the third step is in contact with the other end surface of the first sealing ring;

The second sealing ring is placed in the gap between the second step and the fourth step, the axial gap between the second step and the fourth step is smaller than the thickness of the second sealing ring, so The step surface of the second-shaped step is in contact with one end surface of the second sealing ring, and the step surface of the fourth step is in contact with the other end surface of the second sealing ring;

The rotating air passage is connected to a position between the third step and the fourth step, and the upper static air passage is connected to a position between the first annular step and the second annular step.

Further, both the inner bearing and the outer bearing are unit wheel bearings.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model does not arrange the air channel at the load-bearing position of the bearing on the steering knuckle, which improves the structural strength of the steering knuckle, improves the structural stability of the utility model, and prolongs the service life of the utility model;

2. The utility model moves the transitional airway to the position between the inner bearing and the inner end surface of the hub, so that the upper static airway does not need to be set as long as before to realize the connection with the transitional airway, effectively shortening the upper static airway The length further improves the structural stability of the steering knuckle;

3. The utility model moves the transitional air passage to the outside of the inner bearing and the outer bearing, and adopts the coaxial arrangement of one large and one small sealing rings to seal and cut off the gap between the wheel hub and the steering knuckle to form a transitional air passage. While the structure effectively ensures the sealing of the transitional air passage and the structural strength of the steering knuckle, it also simplifies the assembly process of the hub, bearing and sealing ring, making the sealing ring less likely to be damaged during disassembly, and reducing the load on the hub and bearing. The assembly cost of the assembly with the sealing ring and the maintenance and repair cost of the bearing and the sealing ring;

4. Both the inner bearing and the outer bearing in the utility model adopt the unit wheel bearing, which makes the structure of the utility model more compact;

5. The utility model has the advantages of reasonable layout, high structural strength of the steering knuckle, long service life, simple structure, simple disassembly process of each component, better protection of the airtight parts when the components are disassembled, and compact structure of each component.

Description of drawings

Fig. 1 is the schematic diagram of prior art;

Fig. 2 is a schematic diagram of another structure of the prior art;

Fig. 3 is the schematic diagram of the utility model;

In the figure, steering knuckle 1, hub 2, rotating air channel 3, upper static air channel 4, lower static air channel 5, air channel outlet 6, end cover 7, cavity 8, first sealing ring 9, second sealing ring Ring 10, inner bearing 11, outer bearing 12, transition air passage 13, first sealing ring 14, second sealing ring 15, first annular step 16, second annular step 17, third annular step 18, fourth annular step 19.

detailed description

The utility model will be further described in detail below in conjunction with the description of the accompanying drawings and specific embodiments.

Referring to Fig. 3 , a gas path structure for central inflation and deflation includes a hub 2 in which a steering knuckle 1 is installed through an inner bearing 11 and an outer bearing 12, and an upper still air is arranged inside the steering knuckle 2. Road 4, the inner part of the hub 2 is arranged with a rotating air passage 3, the upper static air passage 4 and the rotating air passage 3 are connected through a transition air passage 13, and the transition air passage 13 is formed by the first sealing ring 14 and the second sealing ring 15 are formed by separating the gap between the hub 2 and the steering knuckle 1, and the first sealing ring 14 and the second sealing ring 15 are coaxially arranged in the gap between the hub 2 and the steering knuckle 1 At the same time, the first sealing ring 14 and the second sealing ring 15 are also located in the area between the inner bearing 11 and the inner end surface of the hub 2; the axial distance between the first sealing ring 14 and the inner bearing 11 is greater than the Describe the axial distance from the second sealing ring 15 to the inner bearing 11;

The upper static air passage 4 extends from the root of the steering knuckle 1 to the position between the first sealing ring 14 and the second sealing ring 15 on the steering knuckle 1, and the transition air passage 13 connected; the rotating air passage 3 extends from the outer end surface of the hub 2 to the position between the placement of the first sealing ring 14 and the placement of the second sealing ring 15 on the hub 2, and is connected to the transition air passage 13. connected.

In the utility model, the transitional air passage 13 connecting the upper static air passage 4 and the rotating air passage 3 is arranged in the area outside the inner bearing 11 and the outer bearing 12, avoiding the arrangement of the steering knuckle 1 at the bearing position of the bearing The static air passage 4 makes the steering knuckle 1 have better structural strength, makes the utility model have better structural stability, and prolongs the service life of the utility model. At the same time, since the transition air passage 13 is moved toward the inner end surface of the hub 2, the upper static air passage 4 does not need to be set as long as before to realize the connection with the transition air passage 13, further improving the structure of the steering knuckle 1. strength.

Preferably, the inner diameter of the first sealing ring 14 is greater than the inner diameter of the second sealing ring 15, and the outer diameter of the first sealing ring 14 is greater than the outer diameter of the second sealing ring 15; 1 is provided with a first-level step 16 and a second-level step 17, and the hub 2 is provided with a third-level step 18 corresponding to the first-level step 16, and the hub 2 is provided with a The fourth step 19 corresponding to the second step 17;

The first seal ring 14 is placed in the gap between the first step 16 and the third step 18, and the axial gap between the first step 16 and the third step 18 is smaller than that of the first seal. The thickness of the ring 14, the step surface of the first step 16 is in contact with one end surface of the first sealing ring 14, and the step surface of the third step 18 is in contact with the other end surface of the first sealing ring 14;

The second seal ring 15 is placed in the gap between the second step 17 and the fourth step 19, and the axial gap between the second step 17 and the fourth step 19 is smaller than that of the second seal The thickness of the ring 15, the step surface of the second shaped step 17 is in contact with one end surface of the second sealing ring 15, and the step surface of the fourth step 19 is in contact with the other end surface of the second sealing ring 15;

The rotating air passage 3 is connected to the position between the third step 18 and the fourth step 19, and the upper static air passage 4 is connected to the first annular step 16 and the second annular step 17 position between. The transition air passage 13 is formed by the first sealing ring 14 and the second sealing ring 15 blocking the annular gap between the hub 2 and the steering knuckle 1 .

The utility model adopts the method of coaxial arrangement of two sealing rings, one large and one small, to seal and connect the upper static air passage 4 and the rotating air passage 3. This sealing and partitioning method can effectively retain the conical structure of the root of the steering knuckle 1, effectively Ensure the structural strength of the steering knuckle 1; at the same time, it also makes the assembly process of the hub, bearing and sealing ring easier, making the sealing ring less likely to be damaged during disassembly, reducing the assembly cost of the hub, bearing and sealing ring and Maintenance and repair costs of bearings and seals.

Preferably, the inner bearing 11 and the outer bearing 12 are both unit wheel bearings, which makes the structure of the utility model more compact.

In the utility model, the air path structure from stationary to moving is: first pass through the upper stationary air passage 4 on the stationary steering knuckle 1, and then pass through the hub 2 separated by the first sealing ring 14 and the second sealing ring 15 The transition air passage 13 formed by the gap between the steering knuckle 1 and the steering knuckle 1 is connected through the transition air passage 13 and then through the rotating air passage 3 arranged on the hub 2, and finally leads to the tire.

The above content is a further detailed description of the utility model in conjunction with specific embodiments. It cannot be considered that the specific implementation of the utility model is only limited to these descriptions. Under the premise of the new concept, all simple replacements should be considered as belonging to the protection scope of the present utility model.

Claims (3)

1. the gas circuit structure of a central inflation/deflation, comprise wheel hub (2), by neck bearing (11) and outer bearing (12), steering swivel (1) is installed in described wheel hub (2), the internal placement of described steering swivel (2) has upper static air flue (4), the internal placement of described wheel hub (2) has rotation air flue (3), described upper static air flue (4) is connected by transition air flue (13) with rotation air flue (3), described transition air flue (13) is cut off the gap between wheel hub (2) and steering swivel (1) by the first seal ring (14) and the second seal ring (15) and is formed, it is characterized in that: in described the first seal ring (14) and the gap of the second seal ring (15) placed coaxial between wheel hub (2) and steering swivel (1), and be positioned between described neck bearing (11) and wheel hub (2) inner end surface, described first seal ring (14) is greater than the axial distance of described second seal ring (15) to neck bearing (11) to the axial distance of neck bearing (11),

The root of described upper static air flue (4) low damage joint (1) rises, and extends to the position between upper first seal ring (14) resettlement place of steering swivel (1) and the second seal ring (15) resettlement place, is connected with described transition air flue (13); The outer face of described rotation air flue (3) from wheel hub (2), extend to the position between upper first seal ring (14) resettlement place of wheel hub (2) and the second seal ring (15) resettlement place, be connected with transition air flue (13).

2. the gas circuit structure of a kind of central inflation/deflation according to claim 1, it is characterized in that: the internal diameter of described first seal ring (14) is greater than the internal diameter of described second seal ring (15), the external diameter of described first seal ring (14) is greater than the external diameter of described second seal ring (15); Described steering swivel (1) is provided with first order step (16) and second stage step (17), described wheel hub (2) is provided with the third stage step (18) corresponding with described first order step (16), and described wheel hub (2) is provided with the fourth stage step (19) corresponding with described second stage step (17);

Described the first seal ring (14) is placed in the gap between first order step (16) and third stage step (18), endplay between described first order step (16) and third stage step (18) is less than the thickness of the first seal ring (14), the step surface of described first order step (16) contacts with an end face of the first seal ring (14), and the step surface of described third stage step (18) contacts with the other end of the first seal ring (14);

Described the second seal ring (15) is placed in the gap between the second shape step (17) and fourth stage step (19), endplay between described second stage step (17) and fourth stage step (19) is less than the thickness of the second seal ring (15), the step surface of described second shape step (17) contacts with an end face of the second seal ring (15), and the step surface of described fourth stage step (19) contacts with the other end of the second seal ring (15);

Described rotation air flue (3) is switched to the position between third stage step (18) and fourth stage step (19), and described upper static air flue (4) is switched to the position between first order ring-shaped step (16) and second stage ring-shaped step (17).

3. the gas circuit structure of a kind of central inflation/deflation according to claim 1, is characterized in that: described neck bearing (11) and outer bearing (12) are unit wheel bearing.