CN204077247U - Wheel end assembly - Google Patents

Abstract

The utility model provides a kind of wheel end assembly, comprise wheel hub, transmission shaft is provided with in wheel hub, central siphon is provided with between transmission shaft and wheel hub, two bearings be oppositely arranged are provided with between central siphon and wheel hub, be provided with between two bearings and form and the support spacer be partitioned into after fine limit work with wheel hub integrally casting, two end faces supporting spacer lean respectively on the inner ring of two bearings.By wheel hub, to support spacer integrally casting shaping, adopt one-time positioning, clamping processing wheel hub and support spacer, reduce position error, ensure that the conformability of dimension limit, form and position tolerance between wheel hub and support spacer, effectively reduce the play supported between spacer and bearing, greatly reduce accumulated error, and then ensure that the service life of bearing and the normal work of wheel end assembly; Meanwhile, the structure of support spacer of integral type casting meets such as vehicle turning, stressed by under the environment such as severe impact, enhances service life, and can improve intensity and the load-carrying capacity of wheel hub.

Description

wheel end assembly

technical field

The utility model belongs to the technical field of commercial vehicles/passenger vehicles, and in particular relates to a wheel end assembly.

Background technique

At this stage, with the rapid development of China's expressway network and automobile logistics industry, the number of commercial vehicles/passenger vehicles is increasing. At present, commercial vehicles/passenger wheels mostly use two rows of tapered roller bearings for rotation. The use of tapered rollers causes the axial play of the wheel. If the play is too large, the number of rollers participating in rolling contacting the inner and outer rings is too small. , lead to excessive stress and deformation, and reduce the fatigue life of the bearing; the bearing with too small clearance will roll and heat after bearing heavy load, which will cause the inner and outer rings to glue and lock the rollers, resulting in failure. Therefore, when using double row tapered roller bearings, the adjustment of clearance has become a new topic.

The traditional way to adjust the clearance is to tighten the shaft head nut to reach the rated pre-tightening force and then retreat 1/4-1/6 circle. The adjustment of this method is very difficult to control the 1/4-1/6 circle. ;According to the pitch of the shaft head nut is 2mm, then 1/4 turn is about 0.5mm, 1/6 turn is about 0.33mm, the gap is 0.17mm, the clearance of 17 wires is too large for the axle clearance control range, such The clearance adjustment is a relatively rough adjustment, and the operation is very difficult, the effect is not ideal, and many failures are caused.

In order to adjust the bearing clearance more conveniently and easily, the support spacer was born, mainly because the support spacer is used to push between the inner rings of the two bearings to make the inner and outer rings of the two bearings separate to a certain extent, thus appearing clearance. Traditional support spacers appear as a separate part, and the spacer is placed between the two bearings during assembly. The adjustment of such clearance will be affected by the width of the stopper of the outer ring of the bearing, the tolerance of the bearing itself and the error of the support spacer; the influence of the tolerance of the bearing stopper and the spacer is particularly important. In order to ensure the adjustment of the clearance, the tolerance of the bearing block usually needs to be controlled to about ±0.05mm, and the tolerance of the support spacer also needs to be controlled to ±0.05. The product processing is very difficult, and there may still be more than 10 wires. System cumulative error amount.

Utility model content

The purpose of the utility model is to provide a wheel end assembly to achieve the purpose of reducing the accumulated error in the wheel end assembly and improving the service life of the bearing.

In order to solve the above technical problems, the technical solution of the utility model is: the wheel end assembly includes a hub, the hub is provided with a transmission shaft, and a shaft tube for fitting the transmission shaft is provided between the transmission shaft and the hub , there are two oppositely arranged bearings between the shaft tube and the hub, and a support spacer that is integrally cast with the hub and separated after finishing is provided between the two bearings. The two end faces of the sleeve respectively abut against the inner rings of the two bearings.

As an improvement, the diameter of the outer ring of the support spacer is greater than the diameter of the inner ring after the connection between the hub and the support spacer is separated.

As a further improvement, the hub and the supporting spacer are made of the same material.

As a further improvement, both the hub and the supporting spacer are made of cast iron.

As a further improvement, several reinforcing ribs are provided on the periphery of the supporting spacer, and movable gaps are provided between both ends of the reinforcing ribs and the hub.

Owing to adopting above-mentioned technical scheme, the beneficial effect of the utility model is:

The utility model adopts integral casting of the wheel hub and the support spacer, adopts one-time positioning and clamping to process the wheel hub and the support spacer, reduces the positioning error, and ensures the consistency of the size tolerance and shape tolerance between the wheel hub and the support spacer. Compared with the traditional one, it effectively reduces the clearance between the support spacer and the bearing, and greatly reduces the cumulative error, thereby ensuring the service life of the bearing and the normal operation of the wheel end assembly; at the same time, the one-piece cast support The structure of the spacer conforms to the force in the environment such as vehicle turning, severe impact, etc., which enhances the service life, and can improve the strength and bearing capacity of the wheel hub.

Since the diameter of the outer ring of the supporting spacer is greater than the diameter of the inner ring after the separation of the joint, the supporting spacer cannot be separated from the hub after being divided, and the one-to-one matching relationship between the hub and the supporting spacer is realized, eliminating the need for the hub and the hub in the traditional structure. The error amount of the support spacer avoids the problem of falling off and confusion of the support spacer and the wheel hub in the process of production and maintenance, and reduces the difficulty of assembly operation.

Since the supporting spacer and the hub are made of cast iron, the high compressive performance of cast iron is utilized to improve the bearing capacity and service life.

Since the outer periphery of the supporting spacer is provided with several reinforcing ribs, the working strength of the supporting spacer is enhanced and the service life is further enhanced.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a structural schematic view before the wheel hub and the support spacer are divided in Fig. 1;

In the figure, 1-wheel hub; 2-joint; 3-support spacer; 4-bearing; 5-reinforcing rib; 6-shaft nut; 7-transmission shaft;

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1 and Figure 2 together, the wheel end assembly includes a hub 1, the hub 1 is provided with a transmission shaft 7, and a shaft tube 8 for fitting the transmission shaft 7 is provided between the transmission shaft 7 and the hub 1, Between the shaft tube 8 and the wheel hub 1 there are two oppositely arranged bearings 4, and the end of the shaft tube 8 is provided with a shaft nut 6 for adjusting the clearance of the bearing; The supporting spacer 3 is formed and divided after finishing, and the two end surfaces of the supporting spacer 3 respectively lean against the inner rings of the two bearings 4 .

The diameter of the outer ring of the support spacer 3 is greater than the diameter of the inner ring after the joint 2 of the hub 1 and the support spacer 3 is divided; A number of reinforcing ribs 5 are arranged on the periphery, and movable gaps are provided between both ends of the reinforcing ribs 5 and the joint 2 .

The hub 1 and the supporting spacer 3 are made of the same material, preferably cast iron.

As another embodiment of the present utility model, the position of the reinforcing rib 5 on the support spacer 3 can also be set to protrude from the arch, triangle, square, ellipse, arch or other non-standard shapes of the support spacer 3, so as to As a person skilled in the art, it is possible to realize that the support spacer 3 cannot be separated from the hub 1 after being divided, and the one-to-one correspondence between the hub 1 and the support spacer 3 is guaranteed; according to the size of the protruding support spacer 3 shape, the connection The size of place 2 can be reduced accordingly.

The wheel end assembly provided by the utility model is integrally cast and formed by the wheel hub 1 and the support spacer 3, and adopts one-time positioning and clamping to process the wheel hub 1 and the support spacer 3 to reduce positioning errors and ensure that the wheel hub 1 and the support spacer Consistency of dimensional tolerance and shape tolerance between 3, compared with the traditional one, the support spacer 3 cannot be separated from the hub 1 after being divided, realizing the one-to-one matching relationship between the hub 1 and the support spacer 3, effectively reducing the support The clearance between the spacer 3 and the bearing 4 greatly reduces the cumulative error, thereby ensuring the service life of the bearing 4 and the normal operation of the wheel end assembly; at the same time, the structure of the support spacer 3 formed by integral casting conforms to For example, the stress in the environment such as vehicle turning and severe impact is enhanced, the service life is enhanced, and the strength and bearing capacity of the wheel hub can be improved.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (5)

1. The wheel end assembly, including the hub, the hub is provided with a transmission shaft, a shaft tube for fitting the transmission shaft is provided between the transmission shaft and the hub, and a shaft tube is provided between the shaft tube and the hub. There are two oppositely arranged bearings, which are characterized in that a supporting spacer that is integrally cast with the hub and separated after finishing is provided between the two bearings, and the two end surfaces of the supporting spacer respectively abut against On the inner rings of the two bearings. 2 . The wheel end assembly according to claim 1 , wherein the diameter of the outer ring of the support spacer is greater than the diameter of the inner ring after the connection between the hub and the support spacer is separated. 3 . 3. The wheel end assembly according to claim 2, wherein the material of the hub and the supporting spacer is the same. 4. The wheel end assembly according to claim 3, characterized in that, both the hub and the supporting spacer are made of cast iron. 5. The wheel end assembly according to any one of claims 1-4, wherein a number of reinforcing ribs are arranged on the periphery of the supporting spacer, and a gap between the two ends of the reinforcing rib and the hub There are gaps for activities.