Hub bearing structure for improving overload impact

Abstract

The utility model discloses a hub bearing structure for improving overload impact. A bearing structure composed of a bearing outer ring, a steel ball and a bearing inner ring is installed outside the hub flange, the steel ball is located in a ball groove arc groove formed by combining the bearing outer ring and the bearing inner ring, and the steel ball makes contact with the surface of the hub flange to form an impact force load stress point. A small gap structure used for active interference when the hub bearing structure is impacted is arranged between the bearing outer ring and the hub flange. According to the structure, under the impact working condition, the impact load borne by the steel balls in the bearings is reduced through interference between the hub bearings, the structure is simple, implementation is easy, and the impact force of the steel balls of the bearings can be effectively reduced when the brake load of the automobile disc brake is too large.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile disc brake, concretely relates to a wheel hub bearing structure of improving overload impact. BACKGROUND

[0002] Today's industrial industry of the rapid development of the automobile field, the industry is increasingly strengthening the requirement of quality technology. The load impact resistance of the wheel hub bearing of the disc brake is very important for the whole braking system, in order to cope with the impact resistance of the wheel hub bearing under abnormal working condition, the product structure is optimized and improved, and this problem is gradually valued by the industry. INVENTION CONTENTS

[0003] In order to improve and solve the problems in the background art, the utility model provides a wheel hub bearing structure of improving overload impact in automobile brake, which is suitable for improving the impact resistance of the disc brake wheel hub bearing under abnormal working condition and reducing the physical damage of the load to the wheel hub bearing.

[0004] In order to solve the above technical problems, the utility model adopts the technical scheme as follows:

[0005] The structure of the utility model includes bearing outer ring, wheel hub flange, steel ball and bearing inner ring, the bearing structure composed of bearing outer ring, steel ball and bearing inner ring is installed outside the wheel hub flange, wherein the steel ball is in the ball channel arc groove combined between the bearing outer ring and the bearing inner ring, and the steel ball and the wheel hub flange surface contact to form the impact force load stress point, and the small gap structure for actively interfering when the wheel hub bearing structure is impacted is arranged between the bearing outer ring and the wheel hub flange.

[0006] The small gap structure of the wheel hub bearing structure reduces the axial impact load of the steel ball in the bearing through the active interference between the wheel hub flange and the bearing outer ring, and the bearing inner ring and the wheel hub flange cooperate to limit the steel ball to bear the radial load in the ball channel arc groove.

[0007] The bearing inner ring is embedded in the ring groove at the front end of the wheel hub flange, the bearing inner ring and the wheel hub flange outer ring are provided with the bearing outer ring, the front part of the bearing outer ring is located outside the bearing inner ring and is provided with the first ball channel arc groove between the bearing inner ring, the rear part of the bearing outer ring is located outside the rear end of the wheel hub flange and is provided with the second ball channel arc groove between the wheel hub flange, two steel balls are arranged in the first ball channel arc groove and the second ball channel arc groove respectively, and the small gap structure is arranged between the rear part of the bearing outer ring and the rear end of the wheel hub flange.

[0008] The rear end of the wheel hub flange is provided with an outer flange, a front step of the outer flange is provided as an outwardly inclined annular wedge surface, the rear end surface of the bearing outer ring is processed as an inwardly inclined annular end surface, the annular wedge surface of the rear end of the wheel hub flange and the annular end surface of the rear part of the bearing outer ring are matched with each other in parallel, and a small gap for reducing the impact load on the steel ball inside the bearing is formed therebetween.

[0009] The included angle between the annular wedge surface of the wheel hub flange and the annular end surface of the bearing outer ring and the wheel hub flange in the axial direction is 60-70°.

[0010] When not subjected to impact and external force, the gap distance of the small gap structure between the bearing outer ring and the wheel hub flange is λ=0.2-0.3mm.

[0011] The load impact force F2 direction between the annular wedge surface of the wheel hub flange and the annular end surface of the bearing outer ring when subjected to impact interference is perpendicular to the respective surfaces and parallel to the load impact force F1 between the steel ball and the wheel hub flange.

[0012] The wheel hub bearing structure is assembled with the knuckle through the bearing mounting bolt and the bearing mounting bolt hole and assembled with the brake disc through the wheel hub flange bolt.

[0013] The wheel hub flange is fixedly installed on the brake disc through the wheel hub flange bolt, and the bearing outer ring is fixedly installed on the knuckle through the bearing mounting bolt hole and the bearing mounting bolt.

[0014] The wheel hub bearing assembly is combined by a wheel hub and a bearing. Under abnormal operation conditions of a vehicle, the brake bearing steel ball bears too much load, which easily causes the mechanical performance of the wheel hub bearing to decrease and the service life to reduce. The wheel hub bearing assembly with the small gap structure can reduce the impact load on the steel ball inside the bearing through the interference between the wheel hub bearings when subjected to impact conditions.

[0015] The wheel hub bearing assembly has the advantages that the wheel hub bearing assembly has the advantages that the wheel hub bearing assembly has the advantages that

[0016] The wheel hub bearing assembly has the advantages that the wheel hub bearing assembly has the advantages that the wheel hub bearing assembly has the advantages that BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a part structure schematic view of the utility model.

[0018] Figure 2 is Figure 1is a local detailed enlarged view at B of

[0019] Figure 3 is Figure 1 is a local detailed enlarged view at C of

[0020] Figure 4 is a CAE impact force displacement analysis diagram of the structure.

[0021] Figure 5 is a CAE impact force displacement analysis diagram of the improved structure.

[0022] Figure 6 is an external cooperation installation schematic diagram of the utility model.

[0023] Figure 7 is an external part installation cooperation schematic diagram of the utility model.

[0024] In the figure: 1, bearing outer ring, 2, hub flange, 3, steel ball, 4, bearing inner ring, 5, bearing mounting bolt hole, 6, hub flange bolt, 7, bearing mounting bolt, 8, steering knuckle, 9, brake disc. DETAILED DESCRIPTION

[0025] The utility model will be further described below in combination with the drawings and specific embodiments.

[0026] As Figure 1 shown, the structure includes bearing outer ring 1, hub flange 2, steel ball 3 and bearing inner ring 4, and the hub flange 2 is externally provided with a bearing structure composed of bearing outer ring 1, steel ball 3 and bearing inner ring 4, wherein the steel ball 3 is in the ball channel arc groove combined between the bearing outer ring 1 and the bearing inner ring 4, and the steel ball 3 and the hub flange 2 surface contact to form an impact force load stress point; as Figure 2 and Figure 3 shown, a small gap structure for actively interfering when the bearing outer ring 1 of the hub bearing structure is impacted is arranged between the bearing outer ring 1 and the hub flange 2, which protects the steel ball 3 when impacted load and improves the service life and stability.

[0027] The small gap structure of the hub bearing structure reduces the axial impact load of the steel ball 3 inside the bearing through the active interference between the hub flange 2 and the bearing outer ring 1, and the bearing inner ring 4 and the hub flange 2 cooperate to limit the steel ball 3 to bear the radial load in the ball channel arc groove.

[0028] The bearing inner ring 4 is embedded in the ring groove at the front end of the hub flange 2, the bearing inner ring 4 and the outer ring of the hub flange 2 are provided with the bearing outer ring 1, the front part of the bearing outer ring 1 covers the first ball track arc groove between the bearing inner ring 4 and the bearing inner ring 4, the rear part of the bearing outer ring 1 covers the second ball track arc groove between the rear end of the hub flange 2 and the hub flange 2, the two steel balls 3 are arranged in the first ball track arc groove and the second ball track arc groove respectively, the small gap structure is arranged between the rear part of the bearing outer ring 1 and the rear end of the hub flange 2, and the small gap structure is used for impact protection of the steel ball 3 in the second ball track arc groove.

[0029] As shown in Figure 2 and Figure 3 , the rear end of the hub flange 2 is provided with an outer flange, the front step of the outer flange is provided as an outwardly inclined annular wedge surface, the rear end face of the bearing outer ring 1 is processed as an inwardly inclined annular end face, the annular wedge surface of the rear end of the hub flange 2 and the annular end face of the rear part of the bearing outer ring 1 are matched with each other, and a small gap for reducing the axial and radial combined impact load of the steel ball 3 inside the bearing is formed therebetween.

[0030] When the bearing outer ring 1 of the hub bearing structure is impacted, the bearing outer ring 1 moves backward and collides with the hub flange 2, that is, the annular end face of the rear part of the bearing outer ring 1 collides with the annular wedge surface of the rear end of the hub flange 2 and tightly forms an interference inclined surface, and then the small gap structure between the bearing outer ring 1 and the hub flange 2 is interfered, so that the interference forms an abnormal working condition load impact force F1, thereby protecting the steel ball 3 from deformation.

[0031] The included angle between the annular wedge surface of the hub flange 2 / the annular end face of the bearing outer ring 1 and the hub flange 2 in the axial direction is 60-70°, that is, the interference inclined surface angle α of the small gap structure of the bearing outer ring 1 and the hub flange 2 is 60-70°, and the specific value can be determined according to the relationship between the rated load of the vehicle, the brake force of the brake and the gravity center of the wheel.

[0032] When there is no impact and external force, in normal state, the interference gap distance of the small gap structure between the annular end face of the bearing outer ring 1 and the annular wedge surface of the hub flange 2 is λ=0.2-0.3mm, and the interference distance λ is determined according to the interference inclined surface angle α, the design structure matching relationship of the hub flange 2. The greater the interference inclined surface angle α, the smaller the interference distance λ. The interference distance λ can also be adjusted by adjusting the interference inclined surface angle α.

[0033] The load impact force F2 direction between the annular wedge surface of the hub flange 2 / the annular end face of the bearing outer ring 1 when being impacted is perpendicular to the respective surfaces, that is, the load impact force F2 direction of the small gap structure between the bearing outer ring 1 and the hub flange 2 when being impacted is perpendicular to the interference inclined surface formed by the interference of the annular wedge surface and the annular end face, and is parallel to the load impact force F1 between the steel ball 3 and the second ball track arc groove of the hub flange 2.

[0034] As Figure 6 and Figure 7 The hub bearing structure outside is assembled with the steering knuckle 8 through the bearing mounting bolt 7 and the bearing mounting bolt hole 5, and is assembled with the brake disc 9 through the hub flange bolt 6.

[0035] As Figure 6 and Figure 7 The hub flange 2 is fixedly installed on the brake disc 9 of the automobile brake through the circumferentially distributed hub flange bolts 6, the bearing outer ring 1 is fixedly installed on the steering knuckle 8 of the automobile brake through the bearing mounting bolt hole 5 and the bearing mounting bolt 7, and the bearing mounting bolt 7 is threadedly connected to the threaded hole of the steering knuckle 8 after passing through the bearing mounting bolt hole 5.

[0036] In the initial case, the first ball channel arc groove and the second ball channel arc groove are filled with oil, at this time, the steel balls 3 in the first ball channel arc groove and the second ball channel arc groove can freely move, the steel balls 3 in the first ball channel arc groove are respectively in clearance fit with the bearing outer ring 1 and the bearing inner ring 4, and the steel balls 3 in the second ball channel arc groove are respectively in clearance fit with the bearing outer ring 1 and the hub flange 2.

[0037] When the hub bearing structure is impacted, the bearing outer ring 1 moves backward and collides with the hub flange 2, so that the interference contact between the annular end face of the rear part of the bearing outer ring 1 and the annular wedge surface of the rear end of the hub flange 2 forms an interference inclined surface, and then the small gap structure between the bearing outer ring 1 and the hub flange 2 is interfered; at this time, the load impact force F2 of the interference inclined surface is perpendicular to the interference inclined surface and parallel to the load impact force F1 between the steel balls 3 and the second ball channel arc groove of the hub flange 2, so that the steel balls 3 are prevented from being damaged by impact extrusion and the service life is reduced. At this time, the steel balls 3 in the second ball channel arc groove can still be in clearance fit with the bearing outer ring 1 and the hub flange 2, and the steel balls 3 in the first ball channel arc groove can also be in clearance fit with the bearing outer ring 1 and the bearing inner ring 4 under the force-free condition.

[0038] The implementation of the embodiment of the utility model is as follows:

[0039] When the automobile runs on uneven roads or the load exceeds the rated weight of the vehicle, the disc brake hub bearing steel ball 3 bears the excessive load impact force F1. In order to reduce the load impact force F1, the load impact force F2 formed by the small gap interference between the bearing outer ring 1 and the hub flange 2 is used to disperse the automobile hub bearing load impact force F1, so that the load impact force F1 of the steel ball 3 is reduced, the damage of the hub bearing steel ball 3 caused by excessive impact force is avoided, and the service life is prolonged.

[0040] The product is verified by the whole vehicle impact test, 1.0g axial and radial load is loaded, and the change amount of the small gap between the bearing outer ring 1 and the hub flange 2 is measured.

[0041] In one aspect, the utility model structure is through computer aided CAE impact force analysis test result as shown in the figure, the blue part in the figure is extrusion stress, red tensile stress, it can be seen from the figure that the area of impact force is mainly concentrated on the hub flange 2, bearing outer ring 1 and steel ball 3 have almost no extrusion or tensile stress, and the stress protection effect is good, and the protection of the steel ball 3 in the second ball channel arc groove is obvious. Figure 4

[0042] And the conventional hub bearing structure not using the utility model innovative scheme is through computer aided CAE impact force analysis test result as shown in the figure, it can be seen from the figure that the extrusion stress area is concentrated on the bearing outer ring 1, and the tensile stress area is concentrated on the hub flange 2, and the steel ball 3 in the second ball channel arc groove is prone to deformation damage under the extrusion and tensile stress, and the damage effect of the steel ball 3 is obvious. Figure 5

[0043] The above two comparisons can see that the utility model improves the overload impact hub bearing structure and the impact effect is obvious.

[0044] On the other hand, according to computer aided CAE analysis and calculation, the small gap distance λ 1 1.0 Between the bearing outer ring 1 and the hub flange 2 under 1.0g load is 0.24mm.

[0045] And according to the actual product bench test result, the small gap distance λ 2 1.0 Between the bearing outer ring 1 and the hub flange 2 under 1.0g load is 0.22-0.27mm.Combined with CAE analysis and calculation, in order to avoid interference problems in actual application process, λ 2 1.0 =0.27mm (CAE analysis and actual bench result comparison, take the maximum value).

[0046]

[0047] According to the measurement result analysis, as shown in the above table, the small gap distance λ 3 1.0 Between the bearing outer ring 1 and the hub flange 2 is 0.22-0.28mm, the damage degree of the hub bearing steel ball 3 is reduced by 57.28%, the maximum damage degree of the ball channel arc groove under impact indentation is reduced by 70.84% (the damage of the bearing outer ring 1 is reduced by 65.76%, and the damage of the hub flange 2 is reduced by 70.84%), so the utility model has obvious progress and effect.

[0048] ​​The above specific embodiments are used to explain and illustrate the present application, and are not intended to limit the present application, and any modification and change made to the present application within the spirit and protection scope of the claims of the present application shall fall within the protection scope of the present application. The above is only a preferred embodiment of the present application, and therefore, equivalent changes or modifications made to the structure, features and principles described in the patent application range of the present application shall be included in the patent application range of the present application.

Claims

1. A hub bearing structure that improves an overload impact, characterized by, The hub bearing structure is composed of a bearing outer ring (1), a hub flange (2), steel balls (3) and a bearing inner ring (4), the hub flange (2) is externally provided with the bearing structure composed of the bearing outer ring (1), the steel balls (3) and the bearing inner ring (4), the steel balls (3) are arranged in the ball channel arc grooves formed by the bearing outer ring (1) and the bearing inner ring (4), and the steel balls (3) and the hub flange (2) are in surface contact to form impact force load stress points; a small gap structure is arranged between the bearing outer ring (1) and the hub flange (2) to actively interfere when the hub bearing structure is impacted.

2. The hub bearing assembly of claim 1, wherein: The small gap structure of the hub bearing structure reduces the axial impact load of the steel balls (3) in the bearing through the active interference between the hub flange (2) and the bearing outer ring (1), and the bearing inner ring (4) and the hub flange (2) cooperate to limit the radial load of the steel balls (3) in the ball channel arc grooves.

3. The hub bearing assembly of claim 1, wherein: The bearing inner ring (4) is embedded in the ring groove at the front end of the hub flange (2), the bearing inner ring (4) and the outer ring of the hub flange (2) are provided with the bearing outer ring (1), the front part of the bearing outer ring (1) is located outside the bearing inner ring (4) and a first ball channel arc groove is arranged between the bearing inner ring (4), the rear part of the bearing outer ring (1) is located outside the rear end of the hub flange (2) and a second ball channel arc groove is arranged between the hub flange (2), two steel balls (3) are arranged in the first ball channel arc groove and the second ball channel arc groove respectively, and a small gap structure is arranged between the rear part of the bearing outer ring (1) and the rear end of the hub flange (2).

4. The hub bearing assembly of claim 1 or 3, wherein: The rear end of the hub flange (2) is provided with an outer flange, the front step of the outer flange is provided as an outwardly inclined annular wedge surface, the rear end surface of the bearing outer ring (1) is processed as an inwardly inclined annular end surface, the annular wedge surface of the rear end of the hub flange (2) and the annular end surface of the rear part of the bearing outer ring (1) are in parallel cooperation, and a small gap for reducing the impact load of the steel balls (3) in the bearing is formed therebetween.

5. The hub bearing assembly of claim 1, wherein: The included angle between the annular wedge surface of the hub flange (2) and the annular end surface of the bearing outer ring (1) and the axial direction of the hub flange (2) is 60-70°.

6. The hub bearing assembly of claim 1, wherein: When not impacted and under external force, the gap distance of the small gap structure between the bearing outer ring (1) and the hub flange (2) is λ=0.2-0.3mm.

7. The hub bearing assembly of claim 4, wherein: The load impact force F2 direction between the annular wedge surface of the hub flange (2) and the annular end surface of the bearing outer ring (1) is perpendicular to the respective surfaces when impacted and interfered, and is parallel to the load impact force F1 between the steel balls (3) and the hub flange (2).

8. The hub bearing assembly of claim 1, wherein: The hub bearing structure is assembled with a steering knuckle (8) through a bearing mounting bolt (7) and a bearing mounting bolt hole (5), and is assembled with a brake disc (9) through a hub flange bolt (6).

9. The hub bearing assembly of claim 1 or 5, wherein: The hub flange (2) is fixedly installed on the brake disc (9) through the hub flange bolt (6), and the bearing outer ring (1) is fixedly installed on the steering knuckle (8) through the bearing mounting bolt hole (5) and the bearing mounting bolt (7).

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