CN204437074U - Steering axle of automobile thrust-bearing - Google Patents

Abstract

The name of the utility model is a thrust bearing for an automobile steering axle. It belongs to the technical field of rolling bearings. It mainly solves the problem that the assembly of the O-shaped sealing ring of the existing thrust bearing is easy to fall off and the problem of insufficient sealing performance. Its main features are: a thrust bearing composed of a seat ring, a shaft ring, rolling elements and an outer cover; the inner diameter of the bottom of the outer cover is provided with a sealing lip with a skeleton, and the sealing lip is connected to the steering knuckle kingpin. For interference contact fit. The utility model solves the problem that the current O-shaped sealing ring is easy to fall off during assembly, and solves the movement or sliding of the O-shaped sealing ring caused by the rotation of the main pin when the bearing rotates. The utility model has the characteristics of reducing the number of parts of the thrust bearing, facilitating the installation and debugging of the bearing, improving the sealing performance of the bearing, and increasing the service life of the bearing, and is mainly used for the steering support of the front axle.

Description

Thrust bearings for automotive steering axles

technical field

The utility model belongs to the technical field of rolling bearings, in particular to a thrust bearing for an automobile steering axle with a novel sealing structure, which is used for steering support of the automobile front axle.

Background technique

As shown in Figure 1, the front axle steering part is equipped with a thrust bearing 00 and a steering knuckle kingpin 11 for an automobile steering axle. Thrust bearings 00 for automobile steering axles are generally thrust ball bearings, thrust roller bearings, damping bearings, etc. Traditional thrust bearings do not have a seal structure, and many failures of thrust bearings are caused by the loss of grease and seal failure. Caused by muddy water and dust entering the bearing. With the improvement of people's awareness of the steering parts of the front axle, new requirements have been put forward for its performance. Under this background and requirements, the thrust bearings for steering axles have begun to change from non-sealed structures to sealed structures. . And thrust bearings with sealed structures will become a mainstream trend in the future.

The traditional thrust bearing structure is shown in Figure 2, where 1 is the seat ring, 2 is the rolling element, 3 is the shaft ring, and 4 is the outer cover. The seal of the thrust bearing is generally divided into two parts: one is sealed on the shaft ring to prevent foreign matter from entering from the joint between the shaft ring and the shaft; the other is directly added to the seat ring and the outer cover to prevent foreign matter from entering from the bottom. The utility model mainly solves the sealing performance problem on the shaft ring.

At present, the general form of adding a sealing structure on the shaft ring is shown in Figure 3. An O-shaped sealing ring 5 is added between the shaft ring 3 and the outer cover 4. The material of the O-shaped sealing ring is generally nitrile rubber (or other Polymer Materials). The way to achieve it is to dig a groove with a diameter of d on the shaft ring, and then put the O-ring into the groove. The sealing principle is that the O-ring and the kingpin of the steering knuckle are in interference contact and fit to prevent foreign matter from entering so as to achieve sealing purpose. In this case, the following two problems will occur: On the one hand, the diameter d is generally a plus tolerance, which is larger than the outer diameter of the O-ring, because the O-ring and the main pin are interference fit during assembly, and the O-ring The sealing ring has no skeleton and the material is soft. When the thrust bearing is put on the main pin, it is very easy to cause the O-ring to be squeezed out of the groove by the main pin, thus causing the O-ring to fall off during assembly; on the other hand, From the perspective of sealing performance, the O-ring is not fixed in the groove, and the inner diameter is an interference fit with the main pin. When rotating, the O-ring will inevitably rotate with the main pin, and there will be movement or sliding. It is beneficial to the flexibility of bearing rotation and the improvement of sealing performance.

Contents of the invention

The purpose of this utility model is to provide a long-life thrust bearing for a steering axle in view of the above shortcomings, so as to ensure not only good processing and assembly, but also good sealing performance.

The technical solution of the utility model is: a thrust bearing for an automobile steering axle, comprising a thrust bearing composed of a seat ring, a shaft ring, rolling elements and an outer cover, characterized in that: the inner diameter of the bottom of the outer cover is provided with a seal Lip, the sealing lip is an interference contact fit with the king pin of the steering knuckle.

In the technical solution of the utility model, a mounting step is dug on the end surface of the shaft ring near the inner diameter; a sealing step is stamped at the inner diameter of the bottom of the outer cover to cooperate with the mounting step, and the sealing lip is attached to the sealing step.

The sealing lip described in the technical solution of the utility model is a nitrile rubber sealing lip.

The rolling elements described in the technical solution of the utility model are thrust cylindrical rollers, thrust tapered rollers, steel balls or metal sliding rings.

The seat ring described in the technical solution of the utility model can be provided with a butadiene rubber sealing ring with a skeleton.

The utility model is based on a thrust roller bearing composed of a seat ring, a shaft ring, an outer cover, and rolling elements, and a sealing lip is provided at the inner diameter of the bottom of the outer cover, and the seal lip and the kingpin of the steering knuckle are The space is an interference fit, and the sealing lip is firmly attached to the outer cover, instead of adding an O-ring separately, which can effectively prevent foreign matter from entering the bearing and the loss of lubricating grease. The utility model has the following advantages for the installation and use of the steering knuckle thrust bearing: 1) The outer cover and the sealing ring are combined into one, reducing the number of parts, the process principle is simple, easy to implement, and easy to install; 2) Solve the current O-type The sealing ring is easy to fall off during assembly, which solves the problem of movement or sliding caused by the O-ring rotating with the main pin when the bearing rotates, prevents the loss of grease from the fitting gap of the parts, and effectively improves the sealing performance. Compared with the traditional technology, the utility model integrates the outer cover and the sealing ring, has the characteristics of reducing the number of parts of the thrust bearing, facilitating the installation and debugging of the bearing, improving the sealing performance of the bearing, and increasing the service life of the bearing. The thrust bearing described in the utility model is mainly used for the steering support of the front axle.

Description of drawings

Figure 1 is a schematic diagram of the steering part of the front axle.

Fig. 2 is a schematic diagram of a traditional thrust bearing.

Fig. 3 is a schematic diagram of a general sealing structure adopted by a thrust bearing at present.

Fig. 4 is a schematic structural view of the utility model.

Detailed ways

As shown in Figure 1, the steering part of the front axle is equipped with a thrust bearing 00 and a steering knuckle kingpin 11. The utility model is an improvement to the thrust bearing 00.

As shown in Figure 4, the utility model is a thrust bearing with a new seal structure consisting of a seat ring 1, a shaft ring 3, a sealed outer cover 6, and rolling elements 2 between the seat ring 1 and the shaft ring 3. The seat ring 1 and the rolling body 2 are all seat rings and rollers of common structure, which are the same as those of the prior art. Shaft ring 3 and outer cover 6 are new structures. A mounting step is dug on the end face of the shaft ring 3 near the inner diameter, and a sealing step is stamped at the inner diameter of the bottom of the outer cover 6 to fit and contact with the mounting step. The sealing lip is attached to the sealing step. After assembly, the mounting step and the sealing step are matched touch. The sealing lip is a vulcanized nitrile rubber sealing lip, or it can also be a sealing lip made of other polymer materials, which is processed by the process of a skeleton sealing ring, thereby forming an outer cover 6 with a sealing structure. The sealing lip on the outer cover 6 is in interference fit with the outer diameter of the kingpin 11 of the steering knuckle to realize contact sealing, which can prevent the entry of foreign matter and the loss of lubricating grease, thereby achieving a good sealing effect and improving the life of the bearing. The rolling elements 2 are thrust tapered rollers, or thrust cylindrical rollers, steel balls or metal sliding rings. The seat ring 1 is provided with a butadiene rubber sealing ring with a skeleton or other deformed sealing rings. The port of the outer cover 6 is assembled in contact with the slope chamfer of the seat ring 1 in a slope pattern, and after closing, the slope end face of the outer cover 6 is lower than the outer end face of the bearing race 1 .

The utility model has the following positive effects:

1. Compared with Fig. 2, in Fig. 4, the utility model adds a sealing lip on the outer cover, and realizes the sealing function of the thrust bearing without changing the main structural parameters of the thrust bearing, thereby improving the life of the bearing.

2. Compared with Figure 3, the O-ring is used in Figure 3. Since the O-ring has no skeleton and soft material during assembly, it is very easy to cause the O-ring to follow the main pin when the thrust bearing is put on the main pin. The pins move together, thus causing the O-ring to fall off during assembly; while in Figure 4, the utility model adds a sealing lip on the outer cover, and the installation does not need to consider the problems such as the O-ring falling off, and the bearing is directly worn on the main pin. Yes, easy and quick to install.

3. Compared with Figure 3, the O-ring is used in Figure 3, which is not fixed in the groove of the shaft ring. When the bearing rotates, the O-ring will also rotate with the main pin, and there will be movement or Sliding phenomenon occurs, thereby causing poor sealing effect; and in Fig. 4, the utility model directly adds a sealing lip on the outer cover. When the bearing is working, the sealing lip does not rotate, and only the kingpin of the steering knuckle is rotating. In this case, the lip of the sealing ring is in contact with the main pin to seal, which has the following advantages: on the one hand, it can prevent the leakage of lubricating grease and promote backflow; on the other hand, it can more effectively prevent external impurities and dust from entering the working area of the bearing; Will not move back and forth on the end face. Thereby the sealing effect is better.

4. Compared with Fig. 3, it is simple and easy to add a sealing lip on the outer cover in Fig. 4, which reduces the number of parts and is also easy to install and debug, which reduces the production cost to a certain extent.

5. The installation of the thrust bearing of the utility model is simple and easy to implement, and the installation is convenient and fast, which improves the production efficiency; improves the sealing performance of the bearing, which is beneficial to reduce the maintenance cost of the product.

Claims (5)

1. A thrust bearing for an automobile steering axle, comprising a seat ring (1), a shaft ring (3), a rolling element (2) and a thrust bearing composed of an outer cover (6), characterized in that: the outer cover ( 6) There is a sealing lip at the inner diameter of the bottom, and the sealing lip and the steering knuckle kingpin (11) are in interference contact fit. 2. The thrust bearing for an automobile steering axle according to claim 1, characterized in that: a mounting step is dug on the end surface of the shaft ring (3) close to the inner diameter; The mounting step mates with a contacting sealing step to which the sealing lip is attached. 3. The thrust bearing for an automobile steering axle according to claim 1 or 2, wherein the sealing lip is a nitrile rubber sealing lip. 4. The thrust bearing for an automobile steering axle according to claim 1 or 2, characterized in that: the rolling elements (2) are thrust cylindrical rollers, thrust tapered rollers, steel balls or metal sliding rings. 5. The thrust bearing for an automobile steering axle according to claim 1 or 2, characterized in that: the seat ring (1) is provided with a butadiene rubber sealing ring with a skeleton.