Light truck rear axle hub bearing unit
By introducing 45# steel midspace sleeve and high-quality bearing steel design into the light truck rear axle hub bearing unit, combining grease lubrication and fluoroelastic sealing structure, the shortcomings of the existing light truck hub bearing units in terms of load bearing performance and maintenance-freeness are solved, and long life, efficient performance and environmentally friendly results are achieved.
Patent Information
- Application Number
- CN202411013984.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-02
AI Technical Summary
The existing light truck hub bearing units have shortcomings in load-bearing performance and maintenance-freeness, especially in heavy load and environmental pollution.
A light truck rear axle hub bearing unit is designed. By setting a 45# steel middle spacer between the outer bearing and the inner bearing, combining high-quality bearing steel and low-friction bearing design, it adopts a sealing structure of grease lubricated and fluoroelastic materials to ensure the long life and efficient performance of the bearing.
It achieves better load-bearing performance than SKF and FAG structures and better maintenance-free performance than Kangmai structures. It can maintain efficient performance within a warranty mileage of 500,000 kilometers, and reduces the starting torque by more than 20%, improving transmission efficiency and energy saving and efficiency enhancement.
Smart Images
Figure CN119914611A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of light truck wheel hub bearing units, and in particular relates to a light truck rear axle wheel hub bearing unit, which is used for a Qingling KV100 light truck 600P rear axle. Background Art
[0002] With the current market demand, the demand for light trucks at home and abroad is increasing, and the export situation is very good. However, with the increase in domestic and foreign demand, the quality of products is also constantly improving. At present, domestic light truck hub unit manufacturers include ZXY, Kaiyuan, etc., and the bearing industry has also issued relevant standards for commercial vehicle light truck hub bearings and units.
[0003] The advantages of the wheel hub unit assembly are long life, no adjustment, low maintenance, high efficiency, and environmental protection and energy saving. It is the preferred technical solution for the implementation of the National VI standard in the commercial vehicle field.
[0004] At present, regarding the wheel hub bearing units, the wheel hub bearing units of foreign brands SKF and FAG are not heavy-duty enough because there is no intermediate sleeve between the inner bearing and the outer bearing; although the wheel hub bearing units of foreign brand Kangmai are equipped with an intermediate sleeve between the inner bearing and the outer bearing, they are oil lubricated, which will cause high-temperature splashing during use, causing environmental pollution, and the lubricating oil must be replaced frequently, and they do not have the maintenance-free function. In addition, the starting torque of Kangmai's wheel hub bearing units is relatively large, which is not conducive to improving transmission efficiency and energy saving and efficiency improvement. Summary of the invention
[0005] The purpose of the present invention is to provide a light truck front axle hub bearing unit with better load-bearing performance than SKF, FAG and better maintenance-freeness than Conmai. A further purpose is to provide a light truck front axle hub bearing unit for the Qingling KV100 light truck 600P rear axle with a warranty mileage of 500,000 kilometers and a starting torque reduced by more than 20% relative to the Conmai hub bearing unit.
[0006] The technical solution of the present invention is: a light truck rear axle wheel hub bearing unit, including a wheel hub, an outer bearing and an inner bearing, characterized in that: an intermediate sleeve is provided between the outer bearing and the inner bearing, and the material of the intermediate sleeve is 45# steel; the axial clearance of the light truck rear axle wheel hub bearing unit is -0.05~0.10mm, and the tightening torque is 800Nm.
[0007] The light truck rear axle wheel hub bearing unit in the technical solution of the present invention is used for the Qingling KV100 light truck 600P rear axle; the wheel hub is a wheel hub that matches the Qingling KV100 light truck 600P rear axle; the outer bearing, inner bearing and middle spacer sleeve are outer bearings, inner bearings and middle spacer sleeves that match the wheel hub.
[0008] In the technical solution of the present invention, an outer seal is provided between the inner ring of the outer bearing and the wheel hub; and an inner seal is provided between the inner ring of the inner bearing and the wheel hub.
[0009] The outer seal described in the technical solution of the present invention is a single seal made of fluororubber material; an oil seal seat ring is provided on the outer side of the inner ring of the inner bearing, and the inner seal is a combined seal made of fluororubber material and is arranged between the oil seal seat ring and the wheel hub.
[0010] The outer bearing and the inner bearing described in the technical solution of the present invention are injected with grease.
[0011] The lubricating grease described in the technical solution of the present invention is a special lubricating grease for commercial vehicle wheel hub bearing units with an operating temperature in the range of -30°C to 160°C; the lubricating grease is applied to the inner ring assembly before the inner ring assembly is installed.
[0012] The outer bearing and the inner bearing described in the technical solution of the present invention are made of high-grade high-quality bearing steel, the bearing precision is P6 level, the processing technology is P6 level standard, and a long-life bearing is made.
[0013] The outer bearing and the inner bearing described in the technical solution of the present invention are made into low-friction bearings.
[0014] The hub material described in the technical solution of the present invention is ductile iron 500.
[0015] The present invention produces the following positive effects: 1. Compared with the SKF and FAG structures, the wheel hub bearing unit of the present invention has better load-bearing capacity due to the addition of a middle spacer sleeve; compared with the Conmai structure, Conmai uses oil lubrication, which not only requires frequent replacement, but also causes high-temperature splashing during use, causing environmental pollution. The wheel hub bearing unit of the present invention uses grease lubrication, is maintenance-free, and will not pollute the environment.
[0016] 2. The wheel hub bearing unit of the present invention has sealing rings inside and outside, which has a better sealing effect and a warranty mileage of 500,000 kilometers. It can be installed as a whole and is easy to install.
[0017] 3. The wheel hub bearing unit of the present invention uses long-life bearings for the inner bearing and the outer bearing, with a warranty mileage of 500,000 kilometers.
[0018] 4. The hub bearing unit of the present invention has a middle spacer sleeve made of 45# steel, which can compensate for the gap caused by bearing wear during use and maintain the stability of the bearing clearance, which is a key feature to achieve a warranty mileage of 500,000 kilometers.
[0019] 5. The inner bearing and the outer bearing of the wheel hub bearing unit of the present invention adopt low-friction bearings, which can reduce the starting torque of the wheel hub assembly by more than 20% compared with the starting torque of the wheel hub bearing unit of Kangmai, thereby improving the transmission efficiency and saving energy and increasing efficiency.
[0020] 6. The wheel hub bearing unit of the present invention adopts a middle spacer sleeve made of 45# steel, an inner bearing and an outer bearing with long life and low friction, a special grease for commercial vehicle wheel hub bearing units with an operating temperature range of -30°C to 160°C, an outer seal of a fluororubber material monomer seal, an inner seal of a fluororubber material composite seal, an axial clearance of -0.05 to 0.10 mm and a reserve tightening torque of 800 Nm. It has been tested on the rear axle of the Qingling KV100 light truck 600P and has met the design requirement of a warranty mileage of 500,000 kilometers, making it the first choice for the National VI standard.
[0021] The invention is mainly used for rear axle wheel hub bearing units of light trucks with a warranty mileage of 500,000 kilometers. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic structural diagram of the hub bearing unit CVTB of the present invention.
[0023] Figure 2 The present invention is a schematic diagram of the structure of a front axle hub bearing unit of a Qingling KV100 light truck 600P.
[0024] Figure 3 It is a schematic diagram of the hub structure of the hub bearing unit of the present invention.
[0025] Figure 4 It is a schematic diagram of the structure of the intermediate sleeve of the hub bearing unit of the present invention.
[0026] Figure numbers: 1-outer bearing; 2-inner bearing; 3-wheel hub; 4-outer seal; 5-inner seal; 6-middle spacer sleeve. DETAILED DESCRIPTION
[0027] The present invention will be further described below in conjunction with the accompanying drawings.
[0028] like Figure 1 As shown. An embodiment of a light truck rear axle wheel hub bearing unit of the present invention comprises a wheel hub, an inner bearing, an outer bearing, a middle spacer sleeve, an inner seal and an outer seal. Among them, the wheel hub, the inner bearing and the outer bearing are the same as those in the existing light truck rear axle wheel hub bearing unit. The difference is that an middle spacer sleeve is added between the inner bearing and the outer bearing. The axial clearance of the light truck rear axle wheel hub bearing unit is -0.05~0.10mm, and the tightening torque is 800Nm. During use, the middle spacer sleeve 6 made of 45# steel can compensate for the clearance caused by bearing wear and maintain the stability of the bearing clearance of -0.05~0.10mm, thereby increasing the service life of the wheel hub bearing and the unit.
[0029] like Figures 2 to 4 Another embodiment of a light truck rear axle wheel hub bearing unit of the present invention is a wheel hub bearing unit developed for the Qingling KV100 light truck rear axle, which is composed of an outer bearing 1, an inner bearing 2, a wheel hub 3, an outer seal 4, an inner seal 5, a middle spacer 6, etc. The wheel hub bearing unit of the Qingling KV100 light truck rear axle has a tightening torque of 800Nm when the nut is working, and the axial clearance after tightening the nut is -0.05~0.10mm.
[0030] Among them, the material of hub 3 is ductile iron 500, and its structure and size meet the hub design requirements of the rear axle of Qingling KV100 light truck, and meet the design requirement of a warranty mileage of 500,000 kilometers.
[0031] The outer bearing 1 and the inner bearing 2 are long-life bearings. Compared with conventional bearings, the design has been improved in materials and processes. The bearing steel has been upgraded from conventional high-grade bearing steel to high-grade high-quality bearing steel, the bearing accuracy has been improved from conventional P0 to P6, and the processing technology level has been improved to P6 standard, meeting the 500,000-kilometer warranty mileage requirement. The outer rings of the outer bearing 1 and the inner bearing 2 are directly pressed into the wheel hub 3.
[0032] The outer bearing 1 and the inner bearing 2 are low-friction bearings. Compared with conventional bearings, the design has a special design of large inner ring rib diameter, optimized roller ball base surface contact to ensure the optimal position of the roller contact point, and improved internal contact parameters of the inner raceway, outer raceway, and roller raceway. The friction torque of the single bearing is improved by at least 20% after the improvement.
[0033] Before installing the inner ring assembly (roller, cage, inner ring) of the outer bearing 1 and the inner bearing 2, the inner ring assembly must be filled with grease. The grease is a special grease for commercial vehicle wheel hub bearing units. The operating temperature is -30℃~160℃. It is a lifetime maintenance-free grease. The bearing lubrication is grease lubrication instead of oil lubrication. It is a maintenance-free lifetime grease with a service life of more than 500,000 kilometers.
[0034] The middle spacer sleeve 6 is arranged between the outer bearing 1 and the inner bearing 2, and the material is 45# steel. During use, it can compensate for the gap caused by bearing wear, maintain the bearing clearance of -0.05~0.10mm stable, and meet the design requirement of 500,000 kilometers of warranty mileage, thereby ensuring the long life of the hub bearing and unit. The structure and size meet the hub design requirements of the rear axle of Qingling KV100 light truck. After the bearing is worn, due to the certain rigidity of 45# steel, the height of the middle spacer ring will be automatically adjusted in the axial direction to ensure the stability of the clearance. The outer seal ring 4 is arranged between the outer bearing 1 and the inner end of the wheel hub 3. The outer seal 4 is a single body seal, and the rubber material is brown fluororubber. After the outer bearing 1 is assembled, it is pressed into the wheel hub 3.
[0035] The inner seal ring 5 is arranged between the oil seal seat ring and the inner end of the wheel hub 3. The inner seal 5 is a combined seal. The rubber material is brown fluororubber. After the inner bearing 2 is assembled, it is pressed into the wheel hub 3.
[0036] The present invention is a wheel hub bearing unit developed for the rear axle of Qingling KV100 light truck, which has passed the test assembly verification and met the design requirements.
[0037] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.
Claims
1. A light truck rear axle wheel hub bearing unit, comprising a wheel hub, an outer bearing and an inner bearing, characterized in that: An intermediate sleeve is arranged between the outer bearing and the inner bearing, and the material of the intermediate sleeve is 45# steel; the axial clearance of the light truck rear axle hub bearing unit is -0.05~0.10mm, and the tightening torque is 800Nm.
2. A light truck rear axle hub bearing unit according to claim 1, characterized in that: The light truck rear axle wheel hub bearing unit is used for the Qingling KV100 light truck 600P rear axle; the wheel hub is a wheel hub (3) matched with the Qingling KV100 light truck 600P rear axle; the outer bearing, inner bearing and middle spacer sleeve are an outer bearing (1), an inner bearing (2) and a middle spacer sleeve (6) matched with the wheel hub (3).
3. A light truck rear axle hub bearing unit according to claim 1 or 2, characterized in that: An outer seal is arranged between the inner ring of the outer bearing and the wheel hub; an inner seal is arranged between the inner ring of the inner bearing and the wheel hub.
4. A light truck rear axle hub bearing unit according to claim 3, characterized in that: The outer seal is a single seal made of fluororubber material; an oil seal seat ring is arranged outside the inner ring of the inner bearing, and the inner seal is a combined seal made of fluororubber material and arranged between the oil seal seat ring and the wheel hub.
5. A light truck rear axle hub bearing unit according to claim 1, 2 or 4, characterized in that: Lubricating grease is injected into the outer bearing and the inner bearing.
6. A light truck rear axle hub bearing unit according to claim 4, characterized in that: The lubricating grease is a special lubricating grease for commercial vehicle wheel hub bearing units with an operating temperature in the range of -30°C to 160°C; the lubricating grease is applied to the inner ring assembly before the inner ring assembly is installed.
7. A light truck rear axle hub bearing unit according to any one of claims 1-2, 4 and 6, characterized in that: The outer bearing and the inner bearing are made of high-grade high-quality bearing steel, the bearing precision is P6 level, the processing technology is P6 level standard, and the bearings with long life are made.
8. The light truck rear axle hub bearing unit according to claim 7, characterized in that: The outer bearing and the inner bearing are made into low-friction bearings.
9. A light truck rear axle hub bearing unit according to any one of claims 1-2, 4, 6, and 8, characterized in that: The hub material is ductile iron 500.