KR100592090B1 - Wheel Bearing and Constant Velocity Joint - Google Patents

Abstract

The present invention relates to a fastening structure of a wheel bearing and a constant velocity joint to allow a coupling point to maintain a higher strength and a firm coupling state, and to allow a coupling operation to be performed more stably and conveniently.

To this end, the present invention, forming a rib for reinforcing strength on the inner peripheral surface of the hollow hub of the wheel bearing, screwing the nut with a preload adjusting member for adjusting the preload of the bearing on the outer surface of the hub, coupling the hub and the housing It provides a fastening structure of wheel bearings and constant velocity joints by interlocking the circlips with a removable member at the point or by coupling a snap ring to the hub.

Wheel, bearing, constant velocity joint, hub, housing, preload

Description

Saft jointer for driving wheel bearing unit             

1 is a cross-sectional view of a conventional wheel bearing and constant velocity joint fastening structure.

Figure 2 is a cross-sectional view of the wheel bearing and the constant velocity joint fastening structure already filed.

Figure 3 is a cross-sectional view of the wheel bearing and constant velocity joint fastening structure filed differently from FIG.

Figure 4 is a cross-sectional view of the wheel bearing and constant velocity joint fastening structure according to the present invention.

Figure 5 is a schematic diagram of the coupling state for the main part of the fastening structure of Figure 4;

6 is a schematic view of a coupling state different from that of FIG.

7 is a cross-sectional view of the fastening structure different from the coupling configuration of FIG.

<Explanation of symbols for the main parts of the drawings>

50: bearing part 51: outer ring body

52: hub 52: ball

54: inner ring body 56: nut

57, 67: Cover 60: Constant velocity shaft part

61: housing 64: spline

65: rib 66: circlip

68: snap ring

The present invention relates to a fastening structure of a wheel bearing and a constant velocity joint, and in detail, to ensure that their coupling point can maintain a higher strength and a firm coupling state, so that the coupling operation can be performed more stably and conveniently will be.

Wheel bearings and constant velocity joints in the axles of automobiles are power transmission devices for transmitting the power generated by the engine to the wheels, and the dual wheel bearings smooth the wheels by minimizing the friction loss when the wheels are fixed in position and rotated. The constant velocity joint can transmit power at a large angle by transmitting power without changing the rotational speed in the power transmission between the shafts.

1 is a cross-sectional view of the most common coupling structure of the above-described wheel bearing and constant velocity joint.

Referring to FIG. 1, the coupling structure is divided into a wheel bearing unit 10 coupled to a wheel and a constant speed shaft unit 20 connected to a power unit for generating a driving force of the vehicle.

The wheel bearing portion 10 is provided with an outer ring body 11 fixed to the vehicle body and a hub provided on the inner circumference of the outer ring body 11 and mounted with a ball 13 between the outer surface and the inner circumferential surface of the outer ring body 11. It consists of (12) to maintain the basic bearing form.

Here, the hub 12 is known that the outer end is coupled to the wheel, the ball 13 is mounted in the form of a double row to maintain a more smooth rotation of the wheel and the rigidity of the load of the vehicle body.

In addition, the hub 12 is that the outer surface is to perform the inner ring function of the bearing, a separate inner ring body 14 is coupled to the point where the line of the ball 13 is in contact coupling, ball, inner, It is configured to enable preload adjustment of the outer ring.

The constant velocity shaft part 20 is installed inside the housing 21 and the housing 21 coupled to the hub 12 so that the constant velocity shaft 22 always transmits a uniform rotational force in response to a change in the angle of the wheel. The angle conversion mechanism 23 is comprised.

The housing 21 has a shaft 24 penetrating the center portion of the hub 12 to be coupled to the hub 12 on one side, and a screw portion 25 at the end of the shaft 24 penetrating the hub 12. ) Is formed to provide the fixing force of the hub 12 and the housing 21 by the fastening force of the nut 26 to the threaded portion 25.

Here, it is well known that the splines are formed for the purpose of simultaneous rotation at the point where the hub 12 and the shaft 24 are in contact with each other.

In the drawing, reference numeral 27 denotes a boot made of rubber material to seal the inside of the housing 21 to prevent foreign substances from entering.

Since the fastening structure configured as described above depends on the shaft 24 of the coupling method of the hub 12 and the housing 21, the protruding length and the processing of the threaded portion 25 and the nut 25 for penetrating the shaft to the hub 12 are performed. In addition to the increase in manufacturing cost and workability due to the accompanying (26), the problem that the driving efficiency is very low due to the increase in the product weight was exposed.

In addition, since the spline is formed correspondingly long because the coupling point of the shaft 24 and the hub 12 is long, the strength is lowered as the thickness of the shaft is thinner, shortening the life of the product Problems were also exposed.

In order to solve the problems of the fastening structure described above, US Patent No. 6,022,275 (hereinafter referred to as Invention 1) and US Pat. No. 6,497,515 (hereinafter as Applied Invention 2) exclude the shaft in the housing of the constant velocity shaft part, and The technical problem of the hub and the housing of the simpler coupled state is disclosed.

2 is a cross-sectional view showing the configuration of the fastening structure of the above-described application of the present invention 1.

Referring to FIG. 2, the present application 1 has a double row of balls 33 coupled between a hollow hub 32 and an outer ring body 31, and an outer circumferential surface of the hub 32 and an inner circumferential surface of the housing 34 are formed. In order to be fixedly coupled, coupling portions 35 are formed by forming female and male splines on their contact-coupled surfaces, respectively.

In such a configuration, the hub 32 is formed in a hollow shape to reduce weight, and performs a machining operation for forming a spline on an outer surface thereof.

Figure 3a, Figure 3b is a cross-sectional view showing the configuration of the fastening structure of the above-described application of the present invention 2.

Referring to FIG. 3A, the illustrated fastening structure engages a hollow shaft 43 extending from one side of the housing 42 to an inner circumferential surface of the hollow hub 41, and a portion of the housing 42 is arranged in a row of balls ( It is configured to be applied to inner ring in contact with 44).

Such a coupling method reduces the weight and lowers the manufacturing cost by forming the hollow shaft 43.

Referring to FIG. 3B, the illustrated fastening structure combines the outer peripheral surface of the hollow hub 45 with the inner peripheral surface of the housing 46, and a part of the housing 46 is in contact with a row of balls 47 and is applied as an inner ring. .

Such a coupling method is a configuration for expecting high workability by allowing the coupling of the hub 45 and the housing 46 to be easily performed.

The above-described application of the present invention 1 because the hub is formed in a hollow form to reduce the weight, when the spline processing on the outer surface, such as the deformation of the hub at the processing point occurs frequently, the work is Not easy disadvantages arise.

In addition, since the end of the hub is formed far from the contact point of the ball (action point of the bearing) in order to increase the coupling area by increasing the coupling area of the hub and housing, the strength of the coupling part is very weak when rotational force is applied. Is generated.                         

In the case of the present application 2, a structure in which the hollow shaft and the hub are combined may reduce the weight and reduce the manufacturing cost by forming the hollow shaft. The trouble of the work occurring and the degradation of the shaft due to the spline formation are still inherited.

The structure in which the housing part is coupled to the outer surface of the hub of the present invention 2, the hollow shaft-type structure as well as the inner ring to the line of the ball acts as the entire housing during the adjustment of the preload of the bearing, the work is Of course, the tool is not suitable to hold the housing is not implemented because of the large risk of damage to the housing due to the use of a large pliers.

In addition, both of the present invention 2 has a problem in that the economic and time disadvantages in maintenance occurs because part of the configuration is damaged, the wheel bearing and the constant velocity joint itself must be replaced and the preload of the bearing must be adjusted again. .

The present invention has been made in order to solve the above problems, and a first object of the present invention is to provide a fastening structure of a wheel bearing and a constant velocity joint to improve the strength of the coupling point of the hub and the housing.

It is a second object of the present invention to provide a fastening structure of a wheel bearing and a constant velocity joint to easily adjust the preload of the bearing when the wheel bearing and the constant velocity joint are fastened.                         

It is a third object of the present invention to provide a fastening structure of a wheel bearing and a constant velocity joint so that the fastening and disassembly of the wheel bearing and the constant velocity joint can be performed more simply.

In order to achieve the first object described above, the present invention has the following features.

According to claim 1, the present invention provides a fastening structure of a wheel bearing and a constant velocity joint in which a plurality of balls are mounted between the outer ring body and the hub to form a bearing portion, and a housing of the constant velocity shaft portion is coupled to one end of the hub. In this case, the housing is fitted to the outer surface of the hollow hub, the rib is formed on the inner peripheral surface of the linear hub to which the housing is coupled to increase the strength of the coupling point.

By this configuration, the present invention improves the weak strength of the coupling point of the hub when the hub and the housing are engaged.

According to claim 2 to achieve the second object, the present invention is a wheel bearing having a plurality of balls are mounted between the outer ring body and the hub is configured, the housing of the constant velocity shaft portion is coupled to one end of the hub In the fastening structure of the constant velocity joint, the inner ring body coupled to the outer surface of the hub and in contact with the ball arranged on the housing side to perform the function of the inner ring capable of adjusting the preload; In order to slide the inner ring body on the hub is characterized in that it is equipped with a preload adjusting member screwed to the outer surface of the hub and contacted to one surface of the inner ring body.

With this configuration, the present invention can easily perform the preload adjustment of the bearing by a simple operation of rotating the preload adjusting member on the hub.

According to claim 3 to achieve the third object, the present invention is a wheel bearing in which a plurality of balls are mounted between the outer ring body and the hub to form a bearing portion, and the housing of the constant velocity shaft portion is coupled to one end of the hub. In the fastening structure of the constant velocity joint, the housing, characterized in that it comprises a fixing member detachably coupled to the outer peripheral surface of the hub at the point where the hub is coupled to secure the housing.

By this configuration, the present invention, the fixing member is detachably coupled to the hub, the coupling and detachment of the housing to the hub is easily performed.

Hereinafter, embodiments of the present invention to which the above features are applied will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view of a fastening structure of a wheel bearing and a constant velocity joint according to the present invention.

4, the fastening structure according to the present invention is configured by the bearing portion 50, the constant velocity shaft portion 60 is coupled.

The bearing part 50 is provided inside the outer ring body 51 and the outer ring body 51 fixed to the vehicle body of the vehicle, and the lower part 52 and the outer ring body 51 provided in a hollow form to reduce weight. It consists of a number of balls 53 mounted between the hubs 52.

The ball 53 is in contact with the inner circumferential surface of the outer ring body 51 and the outer circumferential surface of the hub 52, respectively, so that the rotation of the hub 52 can be performed smoothly, in addition to this action in consideration of the rigidity of the weight of the vehicle body It is provided in a double row.

The hub 52 has an inner ring body 54 which is slidably moved horizontally and axially at a point where the ball 53 on one side contacts to adjust the preload of the bearing by moving the ball 53 on the constant velocity shaft part 60 side. ) Are combined.

A nut 56, which is a preload adjusting member, is coupled to the outer surface of the hub 52 as a means for adjusting the preload. The nut 56 is in contact with one surface of the inner ring body 54 and the outer surface of the hub 52. Screwed in.

Here, the nut 56 is rotated on the hub 52, the inner ring body 54 in contact with the slide slides as the coupling position is changed to adjust the preload of the bearing, and when the adjustment of the preload is completed, the preload adjusted The nut 56 is fully fixed on the hub 52 so that it is not changed by this external force.

In order to completely fix the caulking or laser welding of the coupling point of the hub 52 and the nut 56, as shown in Figs. 5 and 6, such caulking and laser welding is performed by the hub 52 Considering the load, type, etc. of the vehicle to be transmitted to the vehicle, the nut 56 and the hub 52 are carried out over a portion (shown in FIG. 5) or a circumference (shown in phantom circle in FIG. 6) in contact with each other. do.

In addition to the above configuration, the cover 57 is coupled to the opening of the hollow hub 52 to prevent the inflow of foreign substances, and the cover 57 is fitted to the inner circumferential surface of the hub 52 to be fixed. It is maintained to prevent the breakage of the hub 52 by the inflow of foreign matter.

The constant velocity shaft portion 60 is composed of a housing 61 coupled to the outer peripheral surface of the end of the hub 52, a normal angle conversion mechanism 62 and the constant velocity shaft 63 installed inside the housing 61.

Female and male splines 64 are formed at a coupling point between the housing 61 and the hub 52, and the splines 64 are provided with a rotational power transmitted to the housing 61 by the constant velocity shaft 63. It is as well known that the hub 52 is rotated by the rotation of the (61).

Here, since the spline 64 is formed, the hollow hub 52 has ribs 65 on its inner circumferential surface in order to improve strength against torsional load during rotational driving or compression load during press fitting of the housing 61. Is formed.

The rib 65 is formed on the inner circumferential surface of the linear hub 52 to which the housing 61 is coupled, and is formed in a radial form at the center of the inner circumference thereof, or a shape that completely closes the open portion of the hollow shape.

In addition, after the housing 61 is coupled with the hub 52, the housing 61 includes a circlip 66 as a detachable fixing member that prevents detachment from the hub 52.

The circlip 66 is based on the state coupled to the outer surface of the hub 52, and between the hub 52 and the housing 61 by allowing the housing 61 to be coupled to the outside of the circlip 66 The circlip 66 is maintained in an interference state to provide a fixed coupling force.
In addition, the circlip 66 is coupled to the inner circumferential surface of the groove formed on the outer circumferential surface of the hub 52, the outer circumferential surface of the circlip 66 is fixed to the groove formed on the inner circumferential surface of the housing 61.

In addition to the above configuration, the cover 67 for preventing the inflow of foreign matter is coupled to the inner peripheral surface of the open portion combined with the hub 52 of the housing 61, the cover 67 of the housing 61 It is inserted into the inner circumferential surface and maintained in a fixed state, thereby preventing damage to the coupling site caused by foreign substances or corrosion due to inflow of moisture.

7 is a cross-sectional view of the other fixing member of the housing shown in FIG.

Referring to FIG. 7, when the housing 61 is coupled to the outer surface of the hub 52, the snap ring 68 is adopted as a fixing member coupled to the outer surface of the hub 52 so as to contact the inner wall surface of the housing 61. do.

The snap ring 68 is easily engaged or disengaged by interfering between the hub 52 and the housing 61. For this purpose, the end of the hub 52 protrudes from the inner side of the housing 61. It is natural to form long.

As described above, the present invention, by the rib configuration formed on the inner peripheral surface of the hub, the strength of the coupling point with the housing is greatly improved to solve the weakness of the hub due to the formation of the spline, and the product can be transmitted more stable This has the effect of extending the service life of.

The present invention, the bearing preload is more easily adjusted by the adjustment mechanism formed on the outer surface of the hub, the process of fixing it after the housing is coupled to the hub is simply performed to obtain the effect of improving productivity according to the shortening of the working time do.                     

The present invention provides an economical and timely benefit during maintenance by allowing the housing to be easily detached from the hub regardless of the preload of the bearing to repair and replace any part of the bearing portion or the constant velocity shaft portion. You get an effect.

Furthermore, in the present invention, an open inlet of the bearing part and an open inlet of the constant velocity shaft part housing are closed by a cover, thereby preventing the inflow of foreign matters, thereby reducing the risk of corrosion or damage to parts caused by foreign matters. .

Claims (5)

A plurality of balls 53 are mounted between the outer ring body 51 and the hub 52 to form a bearing portion 50, and one end of the hub 52 has a housing 61 of the constant speed shaft portion 60. In the fastening structure of the combined wheel bearing and constant velocity joint, An inner ring body 54 coupled to an outer surface of the hub 52 and in contact with a ball 53 arranged on the housing 61 to perform a function of an inner ring capable of adjusting preload; In order to slide the inner ring body 54 on the hub 52, the inner ring body 54 is screwed to the outer surface of the hub 52 and brought into contact with one surface of the inner ring body 54, and rotated on the hub 52 to rotate the inner ring body 54. After the preload of the bearing is adjusted to a), the preload adjusting member 56 is fixedly coupled by caulking or laser welding over a part or all of the point of contact with the hub 52; The housing 61 is fitted to the outer surface of the hollow hub 52, the rib 65 is formed on the inner peripheral surface of the linear hub 52 to which the housing 61 is coupled to increase the strength of the coupling point, Grooves are formed on the outer circumferential surface of the hub 52 so that the inner circumferential surfaces of the fixing members 66 and 68 are coupled to the grooves, and the outer circumferential surfaces of the fixing members 66 and 68 are formed on the inner circumferential surface of the housing 61. It is fixed to the inner hub surface of the opening of the hollow hub 52, and the cover (57, 67) for preventing the inflow of foreign matter is mounted on the inner peripheral surface of the housing 61 of the side end coupled to the hub 52 The fastening structure of the wheel bearing and the constant velocity joint. delete delete delete delete

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