CN102418738A - High-rigidity long-life wheel hub bearing unit - Google Patents

Abstract

The invention discloses a high-rigidity and long-life wheel hub bearing unit, which is characterized in that: the left end of the inner flange is provided with a raised curling edge, and the inner circle of the inner ring is set on the outer circle of the left end of the inner flange. In the groove; the outer circle of the inner ring set in the outer circle groove at the left end of the inner flange is provided with a first annular spherical raceway on the inner circle corresponding to the inner circle of the outer flange; the right end of the inner ring A second annular spherical raceway is provided on the circular surface corresponding to the inner circle of the outer flange at the connection with the outer circle step of the inner flange, and the outer circle of the inner flange corresponds to the right end of the inner circle of the outer flange There is a third ring-shaped spherical raceway on the round surface, and a cage and steel balls are respectively installed in the raceway; an O-shaped sealing ring is set on the first outer circle at the left end of the outer flange, and the left end of the inner ring is connected to the left end of the outer flange. There is a first rubber sealing ring and a magnetic dustproof cover between the inner circle; a second rubber sealing ring is set between the outer circle at the right end of the inner flange and the inner circle at the right end of the outer flange to ensure that the inner disc and the outer flange are Sealed at both ends.

Description

High rigidity and long life hub bearing unit

technical field

The invention relates to an automobile hub bearing unit, in particular to a high-rigidity and long-life hub bearing unit.

Background technique

Wheel bearings are important running parts of automobiles. The hub axle bears the heavy responsibility of reducing the frictional resistance when the chassis is running and maintaining the normal driving of the car. In the existing car hub slewing support, the bearing unit structure is adopted. In the small passenger car, the hub bearing unit assembly with double-row angular contact spherical shape is used. For commercial vehicles, off-road vehicles and other commercial vehicles, Due to the large bearing capacity required, conical hub bearing unit assemblies are mostly used. In the process of load-bearing and rotation of the hub, the hub bearing not only bears the axial load, but also bears the radial load, but in actual use: it can’t be a ball bearing or a tapered roller bearing, and the stress situation is very complicated, which affects the hub Although there are many factors for bearing life, they can be summarized into two aspects. One is the influence of factors outside the system, such as road conditions, driving operations, etc.; the other is the influence of factors within the system, such as load distribution and the specific structure of the hub shaft bearing, etc. . The reasons for the early failure of the hub bearing unit, generally speaking, the low stiffness of the rolling bearing and the metal fatigue of the rolling contact surface are the main factors for the early failure and damage of the rolling bearing. Therefore, the existing hub bearing unit structure cannot meet the needs of the development of the automobile industry.

Contents of the invention

The invention provides a high-rigidity and long-life wheel hub bearing unit aiming at the deficiencies in the structural design of the existing hub bearing unit. By setting three ring-shaped spherical raceways on the outer circle of the inner flange and the inner circle of the outer flange, and installing cages and steel balls in the ring-shaped spherical raceways, the structure of the hub unit is changed and the The rigidity of the rolling bearing and the anti-metal fatigue strength of the rolling contact surface can effectively bear large axial loads and longitudinal loads, greatly improving the reliability and service life of the hub bearing unit.

The technical solution of the present invention is: a high-rigidity and long-life hub bearing unit, including an outer flange, an inner flange, an inner ring, steel balls, a cage, an O-ring, a rubber sealing ring, a magnetic dust cover and bolts ; There is a raised crimp at the left end of the inner flange, and a groove is formed between the raised crimp at the left end of the inner flange and the step on the outer circle of the inner flange, and the inner ferrule is set inside In the groove on the outer circle of the left end of the flange, the inner ferrule is locked in the groove by the raised edge at the left end; the outer circle of the inner ferrule corresponds to the inner circle of the outer flange. The first annular spherical raceway; the right end of the inner ring is combined with the upper step end face of the outer circle of the inner flange, and the outer circle of the joint of the inner ring and the outer circle of the inner flange is connected with the inner circle of the outer flange A second annular spherical raceway is provided on the corresponding circular surface, and a ring gear is provided on the outer circle step of the inner flange, and a wheel speed sensor (not shown) is coupled to the ring gear; the outer circle of the right end of the inner flange is connected to A third annular spherical raceway is provided on a circular surface corresponding to the inner circle at the right end of the outer flange.

The first annular spherical raceway, the second annular spherical raceway and the third annular spherical raceway are provided with a first cage and a second cage on the outer circle of the inner ring and the inner circle of the outer flange. and the third cage, install steel balls in the three-row cage respectively; set an O-ring on the outer circle of the left end of the outer flange, and set an O-ring between the outer circle of the left end of the inner ring and the inner circle of the left end of the outer flange. The first rubber sealing ring and the magnetic dustproof cover are provided with a second rubber sealing ring between the outer circle of the right end of the inner flange and the inner circle of the right end of the outer flange to ensure the sealing of both ends of the inner disc and the outer flange.

In the high-rigidity and long-life hub bearing unit of the present invention, knurled bolts 9 are installed on the flange connected with the inner flange as a whole.

The beneficial effects of the present invention are: by adding a steel ball raceway between the outer circle of the inner flange, the outer circle of the inner ferrule, and the inner circle of the outer flange, and installing a cage and steel balls in the added raceway, the wheel hub is changed. The internal structure of the unit enhances the rigidity of the rolling bearing and the anti-metal fatigue strength of the rolling contact surface; improves the bearing capacity of the hub bearing unit and the service life of the hub bearing unit.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described

Fig. 1 is a schematic cross-sectional structure diagram of the present invention.

In the figure 1. Inner flange, 2. Inner ferrule, 3. Magnetic dust cover, 4. The first rubber sealing ring, 5. The outer circle of the left end of the outer flange, 6. O-shaped rubber sealing ring, 7 , Outer flange, 8, Second rubber sealing ring, 9, Knurled bolt, 10, Inner spline, 11, First cage a, Second cage b, Third cage c, 12, Steel ball .

Detailed ways

The left end of the inner flange 1 is provided with a raised bead, and a groove is formed between the raised bead at the left end of the inner flange 1 and the step provided on the outer circle of the inner flange 1, and the inner ferrule 2 The diameter of the outer circle of the inner flange 1 is set to 60-62mm, the diameter of the inner circle of the inner ring 2 is set to 45-46mm, and the inner ring 2 with a width of 28mm is set in the groove on the outer circle of the left end of the inner flange 1, protruding from the left end The curling formed locks the inner ferrule 2 in the groove; preferably, the outer diameter of the inner ferrule 2 is set to 60.1 mm, and the inner diameter of the inner ferrule 2 is 45.6 mm. The outer circle of the inner ring 2 and the inner circle of the outer flange 7 are provided with a first annular spherical raceway, and the right end of the inner ring 2 is combined with the step end surface on the outer circle of the inner flange 1 , there is a second annular spherical raceway on the outer circular surface of the junction of the inner ferrule 2 and the outer circle step of the inner flange 1, which corresponds to the inner circle of the outer flange 7, and on the outer circle of the inner flange A ring gear is provided on the steps, and a wheel speed sensor (not shown) is coupled to the ring gear; a third annular spherical surface is provided on the circular surface corresponding to the outer circle of the right end of the inner flange 1 and the inner circle of the right end of the outer flange 7 raceway.

The outer circle of the inner ferrule 2 and the inner circle of the outer flange 7 are provided with a first annular spherical raceway, a second annular spherical raceway and a third annular spherical raceway, and a first cage a, In the second cage b and the third cage c, steel balls 12 with a diameter of 10.31875mm are respectively installed in the cages; an O-shaped sealing ring is arranged on the outer circle of the left end of the outer flange, and the outer circle of the left end of the inner ring is in contact with the outer circle. A first rubber sealing ring 4 and a magnetic dustproof cover 3 are provided between the inner circle of the left end of the flange, and a second rubber seal is provided between the outer circle of the right end of the inner flange 1 and the inner circle of the right end of the outer flange 7. Ring 8, to ensure that both ends of the inner disc and the outer flange are sealed.

In the hub bearing unit with high rigidity and long life according to the present invention, the flange (disc) connected to the right end of the inner flange is provided with a knurled bolt 9 . The center hole of the inner flange 1 is provided with an inner spline 10, the diameter of the center hole of the inner flange 1 is 32.-32.5 mm, the diameter of the inner spline 10 is 27-28 mm, and the inner spline has 27 teeth. The distance between the left end face of the inner spline and the left end face of the inner flange 1 is 25-26 mm; the height (length) of the inner flange 1 is 95-96 mm, and the diameter of the outer circle of the inner ring 2 is 63 mm. Outer flange 7 heights (length) are 56mm, and outer flange 7 inner diameters are 75-76mm.

The required cage, "O" type sealing ring 6, the first rubber sealing ring, the second rubber sealing ring and the magnetic dustproof cover are purchased directly from the market.

Claims (1)

1. high rigidity long lifetime hub-bearing unit comprises outward flange dish, inner flange, inner ring, steel ball, retainer, O RunddichtringO, rubber seal, magnetic dust cover and bolt; It is characterized in that: be provided with protruding crimping in the inner flange left part; Form groove between the step of establishing on crimping that the inner flange left end is protruding and the inner flange cylindrical; Inside race is sleeved in the groove on the inner flange left end cylindrical, and the crimping protruding by left end is locked at inside race in the groove; The corresponding disc of circle is provided with the first annular sphere raceway in inside race cylindrical and the outward flange dish; Inside race right-hand member head and the inner flange cylindrical end face of topping bar combines; The corresponding disc of circle is provided with the second annular sphere raceway in the cylindrical of inside race and inner flange cylindrical step junction and the outward flange dish; Inner flange cylindrical step is provided with gear ring, is coupled with wheel speed sensors on this gear ring; The corresponding disc of circle is provided with the 3rd annular sphere raceway in inner flange right-hand member cylindrical and the outward flange dish right-hand member; Between the first annular sphere raceway, the second annular sphere raceway and the 3rd annular sphere raceway first retainer, second retainer and the 3rd retainer are installed, in three row retainers, steel ball are installed respectively; Establish the O RunddichtringO on the flange plate left end cylindrical outside; The left end cylindrical of inside race and outward flange are faced left and are provided with first rubber seal and magnetic dust cover between the interior circle of end, are provided with second rubber seal between the circle in the right-hand member cylindrical of inner flange and the right-hand member of outward flange dish.

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