CN115534587A

CN115534587A - Heavy truck suspension variable cross-section hollow half shaft, manufacturing process and heavy truck suspension structure

Info

Publication number: CN115534587A
Application number: CN202211204259.9A
Authority: CN
Inventors: 何晨; 莫小斌; 熊亘; 赵小宁; 朱仕海
Original assignee: Dongfeng Motor Chassis Systems Co Ltd
Current assignee: Dongfeng Motor Chassis Systems Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-12-30

Abstract

The invention relates to a variable cross-section hollow half shaft of a heavy truck suspension, which comprises a shaft body with a hollow structure, wherein a through hole penetrating through two ends of the shaft body is formed in the shaft body, the shaft body comprises a non-bearing section connected with an automobile bracket and a bearing section connected with an automobile hub, the through hole sequentially comprises a first section, a first transition section and a second section, the inner diameter of the first section is larger than that of the second section, the first transition section is in a conical hole shape, two ends of the first transition section are connected with the first section and the second section, the first section is completely arranged in the non-bearing section, and the junction of the non-bearing section and the bearing section corresponds to the second section, wherein the junction of the non-bearing section and the bearing section is more than 2, the junction of the non-bearing section and the bearing section has a smaller aperture at the maximum stress position of the half shaft, so that the sufficient wall thickness and strength are achieved, meanwhile, the non-bearing section has a larger aperture, and a better weight reduction effect is achieved on the basis of satisfying the strength.

Description

Heavy truck suspension variable cross-section hollow half shaft, manufacturing process and heavy truck suspension structure

Technical Field

The invention relates to a heavy truck chassis system suspension assembly, in particular to a variable cross-section hollow half shaft of a heavy truck suspension, a manufacturing process and a heavy truck suspension structure.

Background

The light weight of the automobile is to reduce the whole automobile quality of the automobile as much as possible on the premise of ensuring the strength and the safety performance of the automobile, thereby improving the dynamic property of the automobile, reducing the fuel consumption and reducing the exhaust pollution. Data introduction, if the weight of the whole automobile is reduced by 10%, the fuel efficiency can be improved by 6% -8%; when the whole vehicle mass is reduced by 100 kilograms, the fuel consumption per hundred kilometers can be reduced by 0.3-0.6 liter; due to the requirements of environmental protection and energy conservation, the adoption of new materials, new structures and new process lightweight parts has become the trend of automobile development in the world.

At present, a half shaft in a heavy truck suspension adopts a solid structure, the half shaft is pressed into a mounting plate hole of an automobile support in the assembling process, a wheel hub is mounted on a half shaft overhanging part, a steel plate spring is mounted on the wheel hub, and the half shaft bears load in actual service.

In order to reduce the weight of the half shaft, the half shaft is generally subjected to hollow lightweight treatment, but the following problems are solved by adopting a hollow lightweight structure:

1. performing intensity calculation, establishing a finite element model, and analyzing three boundary conditions of a vertical working condition, a turning working condition and a braking working condition to meet the bearing requirement;

2. the bench loading test meets the bearing requirement;

3. solves the problems of hollow half shaft material, manufacturing technique and cost.

In the prior art, hollow half shafts generally have the following three forms:

1. the large-wall-thickness pipe is adopted, independent ordering is needed in actual production, the maximum pipe inner diameter reaches phi 50mm due to the influence of end face screw holes, the weight reduction effect is not obvious, and even the cost is far higher than that of a solid bar; 2. solid and pipe welding such as friction welding is adopted, and in actual production, the welding mode is found to be adopted, additional welding equipment is required, the allocation is high, and the cost is high; 3. by adopting the hollow forging, the manufacturing process of the mature hollow forging such as the hollow forging of an axle tube on the market at present can realize the forging of an inner hole of a half shaft, and has obvious weight reduction and cost reduction, but at present, no hollow half shaft with the strength and the safety performance meeting the use requirements exists, and research and development are urgently needed.

Disclosure of Invention

Based on the above description, the invention provides a hollow half shaft structure for solving the technical problems of weight reduction or high cost caused by unreasonable structural design of the hollow half shaft in the prior art.

The technical scheme for solving the technical problems is as follows:

the utility model provides a hollow semi-axis of heavy truck suspension variable cross section, its axis body that includes hollow structure, the inside through-hole that runs through its both ends that has of axis body, the axis body includes the non-section of bearing of being connected with vapour car support and the section of bearing of being connected with automobile wheel hub, the through-hole includes first section, first changeover portion and second section in proper order, first section internal diameter size is greater than the internal diameter size of second section, first changeover portion is taper hole form and both ends are connected first section and second section, place in first section in completely the non-section bears the section, the non-bear the section with the juncture of bearing the section corresponds the second section sets up, wherein, the non-bear the section with the juncture factor of safety of bearing the section >2.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the application provides a hollow semi-axis of heavy truck suspension variable cross section, because the internal diameter size of first section is greater than the internal diameter size of second section, and place the non-in the first section completely and bear the weight of the section, the non-bears the weight of the section and bears the weight of the juncture of section and correspond the second section setting, the non-bear the weight of the section with the juncture factor of safety >2 for it is in semi-axis stress maximum position also the non-bear the weight of the section with the juncture of bearing the weight of the section has less aperture, and then has sufficient wall thickness and intensity, bears the section at the non-simultaneously, has great aperture, realizes more excellent weight reduction effect on the basis that satisfies intensity.

On the basis of the technical scheme, the invention can be further improved as follows.

Furthermore, the through hole further comprises a second transition section and a screw hole section, the screw hole section is completely arranged in the bearing section, the inner diameter of the bearing section is smaller than that of the second section, and the second transition section is in a taper hole shape, and two ends of the second transition section are connected with the second section and the screw hole section.

Furthermore, a plurality of flange connecting holes are formed on the end face of the bearing section.

The application also provides a manufacturing process of the heavy truck suspension variable cross-section hollow semi-axle, firstly, the blank of the heavy truck suspension variable cross-section hollow semi-axle is forged, then, the blank is lathed, the blank is subjected to fine lathing after thermal refining, then, a threaded hole is drilled on the end face of the bearing section, then, the workpiece is subjected to surface induction quenching, and the excircle structure is ground after flaw detection, so that the heavy truck suspension variable cross-section hollow semi-axle can be formed.

The application also provides a heavy truck suspension structure which is characterized by comprising a suspension main body, an automobile bracket, a wheel hub and the heavy truck suspension variable-section hollow half shaft;

the automobile supports are installed on two sides of the suspension main body, the wheel hubs are correspondingly connected to the outer sides of the automobile supports through the half shafts, the automobile supports are correspondingly connected to the non-bearing section of the shaft body, and the wheel hubs are correspondingly connected to the bearing section of the shaft body.

Drawings

Fig. 1 is a schematic structural diagram of a variable cross-section hollow axle shaft of a heavy truck suspension provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a suspension structure of a heavy truck according to embodiment 2 of the present invention.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It is to be understood that spatial relationship terms such as "under" \8230; under "," ' under 8230; \8230; under "\8230;," ' over 8230; over "", "" over "", etc., may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "at 8230; \8230below" and "at 8230; \8230, below" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have transmission of electrical signals or data therebetween.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Example 1

As shown in fig. 1, a variable cross-section hollow axle shaft for a heavy truck suspension according to an embodiment of the present application includes a shaft body 1 having a hollow structure, where a through hole 1a is formed inside the shaft body 1 and penetrates through two ends of the shaft body, and the shaft body 1 includes a non-bearing section 11 connected to a truck chassis and a bearing section 12 connected to a truck hub.

Wherein, through-hole 1a includes first section a1, first changeover portion a12 and second section a2 in proper order, the internal diameter size of first section a1 is greater than the internal diameter size of second section a2, first changeover portion a12 is taper hole form and both ends are connected first section a1 and second section a2, and then form a variable cross section hollow structure.

Because the aperture of the first section a1 is larger, the first section a1 is completely arranged in the non-bearing section, so that more weight reduction designs can be realized on the basis of meeting the strength, and the dead weight of the half shaft is further reduced.

The juncture of the non-bearing section 11 and the bearing section 12 corresponds to the juncture of the automobile support and the wheel hub, and the stress of the half shaft at the juncture is most concentrated due to the stress of the wheel hub, so the juncture corresponds to the second section a2 with smaller aperture, wherein, in order to ensure the strength and meet the bending working condition under the limit condition, the upper and lower stress of the juncture is up to 36 tons through finite element boundary analysis, and the safety coefficient of the juncture of the non-bearing section and the bearing section is more than 2.

More preferably, in this embodiment, the through hole 1a further includes a second transition section a23 and a screw hole section a3, the screw hole section a3 is completely embedded in the bearing section 12, and the inner diameter size of the screw hole section a3 is smaller than that of the second section 12, the second transition section a23 is in a taper hole shape, and two ends of the second transition section a23 are connected to the second section a2 and the screw hole section a3, the first transition section a12 and the second transition section a23 can ensure that the cross-sectional size inside the through hole 1a changes smoothly, reduce the concentration point of internal stress, and prevent the internal stress from being too large.

A plurality of flange connection holes 12a are formed on the end face of the bearing section 12 for connecting flanges or other hub parts.

The hollow half shaft provided by the embodiment can be processed by adopting the following manufacturing process:

firstly, blank of the hollow variable cross-section half shaft is subjected to blank processing by adopting a die forging process, then the blank is subjected to rough turning processing, the processed blank is subjected to fine turning processing after thermal refining, then a threaded hole is drilled on the end surface of the bearing section, finally, the workpiece is subjected to surface induction quenching, and the workpiece is subjected to external circle grinding after internal flaw detection is qualified, so that the hollow variable cross-section half shaft can be formed.

The hollow half shaft provided by the embodiment has a smaller aperture at the maximum stress position of the half shaft, so that the hollow half shaft has enough wall thickness and strength, and meanwhile, the hollow half shaft has a larger aperture at a non-bearing section, so that a better weight reduction effect is realized on the basis of meeting the strength.

When the solid half axle is assembled and used, the weight of each hollow half axle is reduced by about 35 yuan compared with that of a solid half axle, and the weight of the whole automobile is reduced by about 12Kg, so that the cost is reduced while the weight is effectively reduced, and great economic benefits are created for automobile manufacturers.

Example two

The embodiment of the application provides a structural design for assembling the hollow half shaft, namely a heavy truck suspension structure, which comprises a suspension main body 10, an automobile bracket 20, a wheel hub 30 and the heavy truck suspension variable-section hollow half shaft 40.

The automotive brackets 20 are mounted on two sides of the suspension body 10, the non-bearing section of the shaft body of the hollow half shaft 40 is pressed into the mounting hole of the automotive bracket 20, the bearing section of the hollow half shaft 40 is suspended outside the automotive bracket 20, and the wheel hub 30 is mounted on the bearing section of the hollow half shaft 40.

After the suspension structure is installed, the suspension structure is tested according to a test standard, if the loading preset pressure reaches the preset times and is not damaged, the suspension structure is qualified, if the middle part of the suspension structure for the chassis of the heavy truck is loaded with the load pressure of + 4T- +36T at the plate spring seat of the hub, 60 ten thousand times of damage is required.

The suspension structure adopts the design of the variable-section hollow semi-axle structure of the heavy truck suspension, so that the light weight of the automobile suspension structure is realized and the manufacturing cost is saved while the structural strength of the suspension structure is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a hollow semi-axis of heavy truck suspension variable cross-section, a serial communication port, including hollow structure's axis body, the inside through-hole that runs through its both ends that has of axis body, the axis body includes the non-section of bearing who is connected with vapour car support and the section of bearing who is connected with automobile wheel hub, the through-hole includes first section, first changeover portion and second section in proper order, first section internal diameter size is greater than the internal diameter size of second section, first changeover portion is connected for taper hole form and both ends first section and second section, place in first section completely the non-section of bearing, the non-section of bearing with the juncture that bears the section corresponds the second section sets up, wherein, the non-section of bearing with the juncture that bears the section >2.

2. The variable cross-section hollow half shaft of the heavy truck suspension according to claim 1, wherein the through hole further comprises a second transition section and a screw hole section, the screw hole section is completely arranged in the bearing section, the inner diameter of the screw hole section is smaller than that of the second section, the second transition section is in a taper hole shape, and two ends of the second transition section are connected with the second section and the screw hole section.

3. The variable cross-section hollow axle shaft for the heavy truck suspension fork as claimed in claim 2, wherein a plurality of flange connecting holes are formed on the end face of the bearing section.

4. A manufacturing process of a variable-section hollow half shaft of a heavy truck suspension comprises the following steps: firstly die forging a blank of the hollow variable cross-section half shaft, then lathing the blank, carrying out fine lathing on the blank after thermal refining, then drilling a threaded hole on the end surface of the bearing section, then carrying out surface induction quenching on the workpiece, and grinding an excircle structure after flaw detection to form the hollow variable cross-section half shaft.

5. A heavy truck suspension structure is characterized by comprising a suspension main body, an automobile bracket, a wheel hub and the variable-section hollow half shaft of the heavy truck suspension as claimed in claims 1-3;