Hub bearing unit and manufacturing method thereof

Abstract

The invention discloses a hub bearing unit and a manufacturing method thereof, and relates to the field of bearings, the hub bearing unit comprises an inner ring and an outer ring, fan blades are arranged on the outer wall of the inner ring, shells are detachably arranged on the two sides of the outer ring, heat dissipation pipes are arranged on the inner sides of the shells, grooves are formed in the outer ring, and cooling pipes are arranged in the grooves. The fan blades on the inner ring dissipate heat of the outer surface of the bearing body, internal hot air is exhausted from the air outlet, clean exchange of internal air and external air is achieved through cooperation of the one-way air outlet mechanism and the filter screen, meanwhile, the fan blades can cool cooling liquid in the heat dissipation pipe, the cooling pipe is located in the inner cavity of the outer ring, and the cooling effect is good. And heat exchange work is conducted through cooling liquid in the cooling pipes, the cooling liquid which is expanded after being heated enters the cooling pipes to be cooled, circulation of the cooling liquid is achieved through expansion and contraction of the cooling liquid, and the cooling effect of the hub bearing unit is further improved.

Description

Technical Field

[0001] The invention relates to the field of bearings, and in particular to a wheel hub bearing unit and a manufacturing method thereof. Background Art

[0002] The wheel hub bearing is one of the key parts of the automobile. Its main function is to bear weight and provide precise guidance for the rotation of the wheel hub. This requires it to be able to withstand not only axial loads but also radial loads. The wheel hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings into one, and has the advantages of good assembly performance, omitting clearance adjustment, light weight, compact structure, large load capacity, grease can be pre-loaded for sealed bearings, omitting external wheel hub seals and maintenance-free. It has been widely used in cars and there is a trend of gradually expanding its application in trucks.

[0003] Wheel hub bearings will be significantly affected in high temperature environments, mainly manifested as increased friction resistance, increased energy consumption and possible damage. The friction torque and energy consumption of wheel hub bearings are related to many factors, including bearing structure, processing accuracy, assembly accuracy, material properties, grease properties and vehicle driving environment temperature.

[0004] Among the above factors that affect the friction torque and energy consumption of wheel hub bearings, the performance of grease and the temperature of the vehicle's driving environment have the greatest impact on wheel hub bearings. The main functions of grease in wheel hub bearings include lubrication, cooling, dust prevention, corrosion prevention and sealing. Grease lubricates the inside of the bearing and reduces the friction between the moving and static parts. However, prolonged exposure to high temperatures will cause the grease to become ineffective, ultimately leading to early failure or damage of the bearing.

[0005] Therefore, in order to reduce the adverse effects of high temperature on bearings, cooling equipment is often installed on wheel hub bearings to alleviate abnormal heating of bearings and improve the cooling effect of bearings. However, in actual use, although the cooling equipment can achieve the corresponding cooling effect, some dust and impurities will enter the bearings exposed to the outside during daily work. When dust and impurities come into contact with grease, the lubricating effect of grease will be reduced, thereby increasing the friction of the bearing during operation, which will have an adverse effect on the normal operation of the bearing. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide a wheel hub bearing unit and a manufacturing method thereof, so as to solve the technical problem that some dust and impurities will enter the interior of the bearing during daily operation, and the lubricating effect of the grease will be reduced after the dust and impurities come into contact with the grease.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a hub bearing unit, comprising an inner ring and an outer ring, the outer wall of the inner ring is provided with fan blades, outer shells are detachably provided on both sides of the outer ring, a heat dissipation pipe is provided on the inner side of the outer shell, a groove is provided inside the outer ring, a cooling pipe is provided inside the groove, the heat dissipation pipe and the cooling pipe are connected by a connecting pipe, a plurality of air outlets are provided on the outer wall of the outer ring, and a one-way air outlet mechanism is provided on the inner wall of the air outlet.

[0008] The present invention is further configured such that two groups of needle rollers are arranged between the inner ring and the outer ring, and the two groups of needle rollers are symmetrically arranged through the central end surface of the inner ring.

[0009] The present invention is further configured such that a retaining frame is provided between the inner ring and the outer ring, the needle roller is located inside the retaining frame, and an end cover is provided between the inner ring and the outer ring on one side of the retaining frame.

[0010] The present invention is further configured such that an air inlet is provided on the outer wall of the shell, and a filter is provided on the inner wall of the air inlet.

[0011] The present invention is further configured such that the outer shell is inserted into one side of the outer ring, and the outer walls of the outer shell and the outer ring are both provided with threaded holes, the inner walls of the threaded holes are provided with fixing bolts, and the outer shell and the outer ring are detachably fixed by the fixing bolts.

[0012] The present invention is further configured such that the liquid inlet and outlet ends of the cooling pipe and the liquid inlet and outlet ends of the connecting pipe are all installed with one-way valves, and the cooling pipe, connecting pipe and heat dissipation pipe form a coolant circuit through the one-way valve.

[0013] The present invention is further configured such that a slope is provided on one side of the shell, and the air outlets are evenly laid on the slope.

[0014] The present invention is further configured such that the heat dissipation pipe is threaded.

[0015] The present invention is further configured such that the one-way air outlet mechanism is a check valve body structure, which ensures that the air outlet direction of the air outlet remains unchanged.

[0016] A method for preparing a wheel hub bearing unit comprises the following steps: S1: Prepare molds for inner rings, outer rings, needle rollers, cages, housings, heat pipes, cooling pipes and other related components, and prepare related components based on the molds. Use high-quality low-carbon steel as the matrix, use bearing steel to prepare inner rings, outer rings, needle rollers, cages, housings, heat pipes, connecting pipes, cooling pipes and other components, and drill air outlets and air inlets on the housings through drilling and milling lathes, and open threaded holes for fixing bolts on the outer walls of the housings and outer rings; S2: Install a one-way valve on the connecting pipe and the cooling pipe, and insert the connecting pipe into the heat dissipation pipe to form a coolant circuit; S3: Insert the housing into the outer ring and secure it with the fixing bolts to complete the installation.

[0017] In summary, the present invention mainly has the following beneficial effects: the fan blades on the inner ring of the present invention dissipate heat for the outer surface of the bearing body, discharge the internal hot air from the air outlet, and cooperate with the filter screen through the one-way air outlet mechanism to achieve clean exchange of internal and external air. At the same time, the fan blades can also cool the coolant inside the heat dissipation pipe. The cooling pipe is located in the internal cavity of the outer ring. Heat exchange is carried out through the coolant inside the cooling pipe. The coolant expanded by heat enters the heat dissipation pipe for cooling. The expansion and contraction of the coolant realizes the circulation of the coolant, which further improves the heat dissipation effect of the hub bearing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at A; Figure 4 It is a schematic diagram of the internal structure of the bearing of the present invention.

[0019] In the figure: 1. Inner ring; 2. Outer ring; 3. Needle roller; 4. Cage; 5. End cover; 6. Outer shell; 7. Heat dissipation pipe; 8. Connecting pipe; 9. Cooling pipe; 10. One-way valve; 11. Fan blade; 12. Air outlet; 13. Fixing bolt; 14. Air inlet; 15. Inclined surface. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] The following describes an embodiment of the present invention based on its overall structure.

[0022] A wheel hub bearing unit and a manufacturing method thereof, Figure 1-4As shown, it includes an inner ring 1 and an outer ring 2, two groups of needle rollers 3 are arranged between the inner ring 1 and the outer ring 2, and the two groups of needle rollers 3 are symmetrically arranged through the central end face of the inner ring 1. The symmetrically arranged needle rollers 3 can ensure that when the bearing unit plays a supporting role, the end faces on both sides can play the same supporting role, and the supporting effect is better when subjected to pressure from directly above and directly below. At the same time, there is a gap between the two groups of needle rollers 3, and the gap is filled with grease, which can better lubricate the bearing unit. A retaining frame 4 is arranged between the inner ring 1 and the outer ring 2, and the needle rollers 3 are located inside the retaining frame 4. An end cover 5 is arranged between the inner ring 1 and the outer ring 2 on one side of the retaining frame 4, and the end cover 5 protects the internal needle rollers 3 and the retaining frame 4 from dust and ash.

[0023] The outer wall of the inner ring 1 is provided with fan blades 11, and the outer shell 6 is detachably provided on both sides of the outer ring 2. The outer wall of the outer ring 2 is provided with multiple air outlets 12. Since the inner ring 1 is connected to the axle, when the axle rotates, the inner ring 1 also rotates, so the fan blades 11 will rotate synchronously, and cooperate with the outer shell 6 to form a relatively closed space, so that the heat generated by the bearing can be discharged uniformly from the air outlet 12.

[0024] Furthermore, a slope 15 is provided on one side of the housing 6, and the air outlets 12 are evenly laid on the slope 15. The heat dissipation pipe 7 is threaded, and the slope 15 can increase the heat dissipation area of ​​the housing 6 and cooperate with the heat dissipation pipe 7 to effectively dissipate heat.

[0025] The heat dissipation function of the fan blades 11 is achieved through the exchange of internal and external air, but the exchange of internal and external air will bring external dust into the interior of the shell 6, causing dust to enter the interior of the bearing unit. When the dust impurities come into contact with the grease, the lubricating effect of the grease will be reduced. The inner wall of the air outlet 12 is provided with a one-way air outlet mechanism, and the one-way air outlet mechanism is a check valve body structure, which ensures that the air outlet direction of the air outlet 12 remains unchanged. The outer wall of the shell 6 is provided with an air inlet 14, and the inner wall of the air inlet 14 is provided with a filter. When the fan blades 11 are working, air flow is generated to discharge heat from the air outlet 12. The one-way air outlet mechanism ensures that the air flow can only be discharged from the air outlet 12, and no dust impurities will reversely enter the interior of the shell 6. The air inlet 14 cooperates with the air outlet 12 to realize the circulation of the air flow. At the same time, the filter can also prevent dust from entering. Cooperating with the one-way air outlet mechanism, relative isolation of the shell 6 is achieved, which effectively prevents dust from entering while achieving heat dissipation.

[0026] A heat dissipation pipe 7 is arranged on the inner side of the outer shell 6, a groove is opened inside the outer ring 2, a cooling pipe 9 is arranged inside the groove, and a one-way valve 10 is installed at the liquid inlet and outlet ends of the cooling pipe 9 and the liquid inlet and outlet ends of the connecting pipe 8. The cooling pipe 9, the connecting pipe 8 and the heat dissipation pipe 7 form a coolant circuit through the one-way valve 10. When the wheel hub bearing is in a high temperature state, the coolant inside the cooling pipe 9 will exchange heat with the bearing. At this time, the coolant inside the cooling pipe 9 will expand and squeeze into the heat dissipation pipe 7. Since the wheel hub bearing unit is in a high temperature state when the vehicle is mostly in a driving state, the inner ring 1 and the fan blades 11 are in a rotating state, so the fan blades 11 will dissipate heat to the heat dissipation pipe 7, and the cooled coolant shrinks and re-enters the cooling pipe 9, and the flow direction of the coolant is guaranteed by the one-way valve 10.

[0027] The outer shell 6 is inserted on one side of the outer ring 2, and the outer walls of the outer shell 6 and the outer ring 2 are both provided with threaded holes, and the inner walls of the threaded holes are provided with fixing bolts 13. The outer shell 6 and the outer ring 2 are detachably fixed by the fixing bolts 13. The outer shell 6 is detachably connected. After being used for a period of time, the fixing bolts 13 can be removed to remove the outer shell 6 for cleaning, and the connecting pipe 8 and the heat dissipation pipe 7 can also be removed simultaneously.

[0028] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A wheel hub bearing unit, comprising an inner ring (1) and an outer ring (2), characterized in that: The outer wall of the inner ring (1) is provided with fan blades (11); the outer ring (2) is detachably provided with outer shells (6) on both sides; the inner side of the outer shell (6) is provided with a heat dissipation pipe (7); the inner side of the outer ring (2) is provided with a groove; the inner side of the groove is provided with a cooling pipe (9); the heat dissipation pipe (7) and the cooling pipe (9) are connected via a connecting pipe (8); the outer wall of the outer ring (2) is provided with a plurality of air outlets (12); the inner wall of the air outlet (12) is provided with a one-way air outlet mechanism.

2. A wheel hub bearing unit according to claim 1, characterized in that: Two groups of needle rollers (3) are arranged between the inner ring (1) and the outer ring (2), and the two groups of needle rollers (3) are symmetrically arranged through the central end surface of the inner ring (1).

3. A wheel hub bearing unit according to claim 2, characterized in that: A retaining frame (4) is provided between the inner ring (1) and the outer ring (2), the needle roller (3) is located inside the retaining frame (4), and an end cover (5) is provided between the inner ring (1) and the outer ring (2) and on one side of the retaining frame (4).

4. The wheel hub bearing unit according to claim 1, characterized in that: An air inlet (14) is provided on the outer wall of the housing (6), and a filter screen is provided on the inner wall of the air inlet (14).

5. The wheel hub bearing unit according to claim 1, characterized in that: The outer shell (6) is inserted into one side of the outer ring (2), and the outer walls of the outer shell (6) and the outer ring (2) are both provided with threaded holes, and the inner walls of the threaded holes are provided with fixing bolts (13), and the outer shell (6) and the outer ring (2) are detachably fixed by the fixing bolts (13).

6. The wheel hub bearing unit according to claim 1, characterized in that: The liquid inlet and outlet ends of the cooling pipe (9) and the liquid inlet and outlet ends of the connecting pipe (8) are all installed with a one-way valve (10); the cooling pipe (9), the connecting pipe (8) and the heat dissipation pipe (7) form a cooling liquid circuit through the one-way valve (10).

7. The wheel hub bearing unit according to claim 1, characterized in that: A slope (15) is provided on one side of the housing (6), and the air outlets (12) are evenly arranged on the slope (15).

8. The wheel hub bearing unit according to claim 1, characterized in that: The heat dissipation pipe (7) is threaded.

9. The wheel hub bearing unit according to claim 1, characterized in that: The one-way air outlet mechanism is a check valve body structure, which ensures that the air outlet direction of the air outlet (12) remains unchanged.

10. A method for manufacturing a wheel hub bearing unit, applied to a wheel hub bearing unit according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: preparing a mold of the inner ring (1), the outer ring (2), the needle roller (3), the cage (4), the outer shell (6), the heat dissipation pipe (7), the cooling pipe (9) and related components, and preparing related components according to the mold, using high-quality low-carbon steel as a matrix, using bearing steel to prepare the inner ring (1), the outer ring (2), the needle roller (3), the cage (4), the outer shell (6), the heat dissipation pipe (7), the connecting pipe (8), and the cooling pipe (9) components, and drilling an air outlet (12) and an air inlet (14) on the outer shell (6) and opening threaded holes for fixing bolts (13) on the outer walls of the outer shell (6) and the outer ring (2) by means of a drilling and milling lathe; S2: Install a one-way valve (10) on the connecting pipe (8) and the cooling pipe (9), and insert the connecting pipe (8) into the heat dissipation pipe (7) to form a coolant circuit; S3: Insert the housing (6) into the outer ring (2) and secure it with the fixing bolts (13) to complete the installation.

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