CN107244183B

CN107244183B - Rim structure of lightweight wheel hub

Info

Publication number: CN107244183B
Application number: CN201710410856.XA
Authority: CN
Inventors: 简伟文; 耿家勤; 陈伟云; 张其强; 李洪梅
Original assignee: Foshan Nanhai Superband Mould Co Ltd
Current assignee: Foshan Nanhai Superband Mould Co Ltd
Priority date: 2017-06-04
Filing date: 2017-06-04
Publication date: 2023-02-28
Anticipated expiration: 2037-06-04
Also published as: CN107244183A

Abstract

The rim structure of the light-weight hub comprises a rim arranged annularly, and is characterized in that four bosses which are uniformly distributed in the circumferential direction and protrude outwards in the radial direction are arranged on the outer side surface of the rim, the four bosses have basically the same size and are positioned on the same radial cross section, and one boss is provided with a valve hole. Therefore, hand processing in the later stage can be reduced, and the processing efficiency of the hub is improved. In addition, the weight of the hub can be reduced, and the dynamic balance of the hub can be maintained.

Description

Rim structure of lightweight wheel hub

Technical Field

The invention relates to a rim structure, in particular to a rim structure of a light-weight hub.

Background

For energy and environmental protection, the weight reduction of automobiles has become one of the targets commonly pursued by automobile manufacturers and automobile users. A hub, which is one of extremely important components of an automobile, is naturally a main object of weight reduction. The weight of the wheel hub is reduced, the driving resistance of the automobile can be reduced, the oil consumption is reduced, and the performances of steering, accelerating, braking and the like of the automobile can be improved. To achieve the purpose of lightening the hub, there are two main approaches: the first is to adopt lightweight materials, such as ultra-high strength steel plates, aluminum alloys, magnesium alloys and other lightweight materials to replace the traditional steel materials; and the second method is to optimize and change the structure of the hub, reduce the wall thickness of the hub and reduce the mass of the hub to the maximum extent. For example, a light-weight light alloy wheel disclosed in chinese patent application 200910015384.3 is composed of a rim, a wheel disc, and a hub, wherein two annular convex rings are arranged on the inner side of the rim, and a convex annular step is arranged at the rim part of the rim. The wall thickness of the rim between the two annular convex rings is reduced by 5 to 20 percent relative to the wall thickness of the rim between the annular step of the rim and the annular convex rings. The wheel hub adopting the structure can effectively reduce the weight of the wheel, effectively reduce the oil consumption and improve the acceleration and the ground adhesion of the vehicle under the condition of meeting the requirements of safe use and reliable performance of the wheel. The rim of the above-mentioned patent application 200910015384.3 ignores the consideration of providing a valve hole. In order to provide the valve hole and ensure that the hub can maintain dynamic balance, as shown in fig. 1 and 2, a convex ring 3 is often required to be arranged on the rim 1, and a valve hole 30 is arranged on the convex ring 3.

Disclosure of Invention

In fig. 1 and 2, the provision of the raised ring clearly increases the wall thickness of the rim and thus the weight of the hub. However, it is a very troublesome problem to provide the valve hole with sufficient structural strength while maintaining the dynamic balance of the hub without providing the projecting ring. In order to solve the above problem, the inventors have considered a method in which a pair of symmetrically disposed bosses are provided on the rim, and a valve hole is provided in one of the bosses. In this way, the above-mentioned problems regarding wall thickness and dynamic balancing are well solved. However, the provision of a pair of bosses can adversely affect later machining of the hub. The reason is that the hub mold generally comprises four side molds, and a parting surface is formed between every two adjacent side molds, so that four parting surfaces are formed by the same shape. In the casting process, a flash is formed on the outer side surface of the rim of the hub at the positions corresponding to the four parting surfaces respectively. In order to remove the flash, a common method is to place the hub in a rotating shaft and rotate the hub at a high speed through the rotating shaft, then attach a cutter to the rim, and remove the flash during the high-speed rotation of the hub. In order to avoid the problem that the boss is also machined in the process of removing the flash, a cutter needs to avoid the boss. This results in a ring of tape cast surfaces (i.e. the surfaces defined by reference numeral 20 in figure 3) on which the bosses are located, which need to be hand machined at a later stage. Due to the precision problem of manual machining, the burrs cannot be completely removed, and obvious machining traces are left. It can be seen that the arrangement of the boss instead of the collar is not perfect. The present inventors have needed further improvements to this approach. After a plurality of tests and improvements, the inventor provides a more complete rim structure of a lightweight hub, which comprises a rim arranged annularly, and is characterized in that four bosses which are uniformly distributed along the circumferential direction and protrude outwards along the radial direction are cast on the outer side surface of the rim, the four bosses have basically the same size and are positioned on the same radial cross section, and a valve hole is formed in one of the bosses.

The further technical scheme can also be that the outer side surface of the boss is provided with a pattern drawing inclined surface.

The further technical scheme can also be that the circumferential width of the boss is 28-50 mm.

According to the technical scheme, the beneficial technical effects of the invention are as follows: because the four bosses which are uniformly distributed along the circumferential direction and protrude outwards along the radial direction are arranged on the outer side surface of the rim. In this way, in the process of designing the hub die, the four bosses are specially arranged corresponding to the positions of the four parting surfaces of the hub die, so that the four flash sections formed on the circle of belt-shaped casting surface where the bosses are located in the casting process respectively fall on the four bosses and cannot fall on other positions of the belt-shaped casting surface. Therefore, convenience can be brought to later processing. Get rid of the in-process of overlap, the cutter can laminate one of them the boss sets up, then lets wheel hub high-speed rotatory, at rotatory in-process, the cutter can once only be processed the overlap on four bosss. Therefore, hand processing in the later stage can be reduced, and the processing efficiency of the hub is improved. But also can avoid the processing trace left over by the processing of staff to influence the outward appearance of wheel hub. In addition, the four bosses are used for replacing the existing convex ring, so that the weight of the hub can be reduced, and the dynamic balance of the hub can be kept.

The invention has the characteristics and advantages, so the invention can be applied to the rim structure of the light-weight hub.

Drawings

FIG. 1 is a cross-sectional schematic view of a prior art hub;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a rim structure of a lightweight hub to which the present invention is applied;

FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 3;

fig. 5 is an enlarged view of a portion C in fig. 4.

Detailed Description

The structure of the rim structure of a lightweight hub to which the present invention is applied will be further described with reference to the accompanying drawings.

As shown in fig. 3 and 4, the rim structure of the lightweight hub 1 includes a rim 3 arranged annularly, and four bosses (4, 41, 42, and 43) which are uniformly distributed in the circumferential direction and protrude outward in the radial direction are provided on the outer side surface of the rim 3. The four bosses (4, 41, 42 and 43) are all of substantially uniform size and have a circumferential width L of 28, 30, 35, 40, 45 or 50mm. The four bosses (4, 41, 42 and 43) are all located on the same radial cross section 0-0. A valve hole 40 is provided in one of the bosses 4. In addition, for the convenience of demolding, the outer side surfaces 401 of the bosses (4, 41, 42 and 43) are provided as draft slopes, and the draft angle a is not less than 10 degrees.

As shown in fig. 4, the hub mold comprises four side molds (5, 51, 52 and 53), and a parting surface is formed between two adjacent side molds, namely the parting surfaces (a, b, c and d). In the process of designing the hub die, the four bosses (4, 41, 42 and 43) are purposely arranged corresponding to the positions of the four parting surfaces (a, b, c and d) of the hub die, so that the four flash sections formed on the circle of the belt-shaped casting surface 20 where the bosses (4, 41, 42 and 43) are located in the casting process respectively fall on the four bosses (4, 41, 42 and 43) and cannot fall on other positions of the belt-shaped casting surface 20. Therefore, convenience can be brought to later processing. In the process of removing the flash, the cutter can be attached to one of the bosses (4, 41, 42 or 43), then the hub 1 is rotated at a high speed, and in the rotating process, the cutter can machine the flash on the four bosses (4, 41, 42 and 43) at one time. Therefore, hand processing in the later stage can be reduced, and the processing efficiency of the hub is improved. But also can avoid the processing trace left over by the processing of staff to influence the outward appearance of wheel hub. In addition, the four bosses (4, 41, 42 and 43) are used for replacing the existing convex ring, so that the weight of the hub 1 can be reduced, and the dynamic balance of the hub 1 can be maintained.

Claims

1. The rim structure of the light hub comprises a rim arranged annularly, and is characterized in that four bosses which are uniformly distributed along the circumferential direction and protrude outwards along the radial direction are cast on the outer side surface of the rim, the four bosses have basically the same size and are positioned on the same radial cross section, and one boss is provided with a valve hole.

2. The rim structure of claim 1, wherein the outer side surface of the boss is provided as a draft angle.

3. The rim structure according to claim 1 or 2, characterized in that the circumferential width of the boss is 28 to 50mm.