CN216951562U

CN216951562U - Transmission rear cover shell

Info

Publication number: CN216951562U
Application number: CN202123299338.6U
Authority: CN
Inventors: 张建刚; 杨溢; 王鹏川; 骆文平; 朱维帅
Original assignee: Xian Fast Auto Drive Co Ltd
Current assignee: Xian Fast Auto Drive Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-07-12
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a transmission rear cover shell, wherein a main shaft bearing hole and a middle shaft bearing hole are arranged on the shell, bosses are arranged at the outer sides of the main shaft bearing hole and the middle shaft bearing hole, two groups of adjacent bosses in the bosses of the main shaft bearing hole are respectively provided with a bolt hole and an oil hole, the side walls of the two bosses are connected into a whole through an arc concave surface, so that an inward concave structure is formed between the other bosses, the wall thickness between the bolt hole and the oil hole is relatively uniform, the air holes and shrinkage holes in the bosses are avoided, the air leakage after processing is avoided, the casting and processing quality of the bosses is improved, meanwhile, the side wall shape of the main shaft bearing hole and the adjacent middle shaft bearing hole boss close to the bosses is a plane vertical to the main plane of the rear cover shell, relative to the arc surface, a certain space is saved on the plane, the area between the two adjacent bosses is increased, and the hot crack caused when the space is too small, the problems that a rear cover shell is easy to crack, the casting quality and the machining quality are low, and the strength is weak in the prior art are solved.

Description

Transmission rear cover shell

Technical Field

The utility model belongs to the technical field of transmission manufacturing, and relates to a transmission rear cover shell.

Background

The aluminum alloy shell is widely applied to light weight of finished automobiles and automobile parts, is used in a large amount in the design of transmission shell parts, and can realize batch production by combining a die-casting process. The rear cover shell is positioned at the rear end of the transmission, plays a role of supporting a shafting in the transmission, simultaneously bears large torque after speed reduction and torque increase of the transmission, and an output shaft bearing hole of the rear cover shell is directly connected with an output flange and a transmission shaft. The main influence factors of the cracking of the rear cover shell are related to various factors such as the suspension mode of the whole box, the vibration load, the unbalance of the transmission shaft, the matching of a main shaft bearing and the like besides the size of blank casting defects and input torque. Meanwhile, along with the trend of high horsepower of the whole vehicle, aiming at the internal casting defect caused by the fact that the periphery of a rear cover main shaft bearing hole is easy to crack and the structure is unreasonable, the product quality is influenced, and the manufacturing cost is increased. Therefore, the original rear cover shell structure needs to be optimized and improved so as to improve the casting quality and increase the strength.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of more casting defects, low yield, difficult casting and the like in the conventional rear cover shell, and provides a transmission rear cover shell which is combined with a finite element analysis method to improve and optimize the structure of a rear cover under the condition of ensuring the strength.

In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:

a transmission rear cover shell comprises a shell body, wherein a main shaft bearing hole is formed in the shell body, a plurality of middle shaft bearing holes are formed in two sides of the main shaft bearing hole, and a plurality of bosses are circumferentially arranged on the outer sides of the main shaft bearing hole and the middle shaft bearing holes;

the boss of the main shaft bearing hole is provided with bolt holes and oil holes, wherein any group of bosses provided with bolt holes and the outer side wall of the adjacent boss provided with the oil hole are connected into a whole through an arc concave surface;

the shape of the side wall of the boss close to the main shaft bearing hole boss and the adjacent intermediate shaft bearing hole boss is a plane vertical to the main plane of the rear cover shell.

The utility model is further improved in that:

and a reinforcing mechanism is arranged on the outer side of the main shaft bearing hole.

The reinforcing mechanism is a plurality of groups of reinforcing ribs, and the reinforcing ribs are circumferentially arranged on the outer side of the main shaft bearing hole.

The width of the reinforcing rib is 5-7 mm.

The rib width of the reinforcing rib is 6 mm.

The reinforcing ribs and the shell are of an integrated structure.

The radius of the radian of the arc-shaped concave surface is 2-6 mm.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model discloses a transmission rear cover shell, wherein a main shaft bearing hole and a middle shaft bearing hole are formed on the shell, bosses are respectively arranged on the outer sides of the main shaft bearing hole and the middle shaft bearing hole, two groups of adjacent bosses in the bosses of the main shaft bearing hole are respectively provided with a bolt hole and an oil hole, the side walls of the two bosses are connected into a whole through an arc concave surface, so that an inward concave structure is formed between the other bosses, the wall thickness between the bolt hole and the oil hole is relatively uniform, the air holes and shrinkage holes in the boss are avoided, the casting and processing quality of the shell is improved, meanwhile, the side wall of the boss close to the main shaft bearing hole boss and the adjacent intermediate shaft bearing hole boss is a plane vertical to the main plane of the rear cover shell, and compared with the cambered surface, the plane saves a certain space, increases the area between the two adjacent bosses, and avoids hot cracks caused when the space is too small in casting.

Furthermore, the reinforcing ribs are circumferentially arranged on the outer side of the main shaft bearing hole, so that the use reliability of the shell is improved, the strength of the shell is increased, and the problem of cracking of a boss of the main shaft bearing hole is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: 1-plane; 2-arc concave surface; and 3, reinforcing ribs.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience and simplicity, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

According to the embodiment of the utility model, the structure optimization design is carried out on the local internal air hole shrinkage cavity, the external air leakage part and the hot crack part of the die-cast aluminum alloy rear cover shell, the thick area is improved, the basic wall thickness is ensured to be 6mm, and the wall thickness is uniform as much as possible. The boss part of the bolt is fed back when the blank is cast, the narrow area between the two bosses is easy to generate heat cracks, the space of the boss crack is enlarged through design improvement, and the problem of heat cracks is solved. And a reserved structure of a through shaft power takeoff which is basically not used is eliminated, and the integral casting quality is improved. The reinforcing ribs 3 at the main shaft bearing hole part are redesigned, the strength is improved, and the problem of cracking of the main shaft bearing hole part is solved.

According to the embodiment of the utility model, the rear cover is provided with the main shaft bearing hole and the intermediate shaft bearing hole, bosses are arranged on the outer sides of the main shaft bearing hole and the intermediate shaft bearing hole, six bolt holes and one oil hole which are connected with the main shaft rear bearing cover are distributed on the boss of the main shaft bearing hole, one bolt hole is adjacent to the oil hole, and the side walls of the bolt hole and the boss of the oil hole are connected into a whole through the arc concave surface to form an inwards concave structure, so that the wall thickness between the bolt hole and the oil hole can be reduced and relatively uniform, the defects of air holes and shrinkage holes in a die-cast blank are avoided, and the casting quality is improved; meanwhile, the bolt hole boss at the position, closest to the bearing hole boss of the upper left middle shaft, of the main shaft bearing hole is provided with a plane perpendicular to the main plane of the rear cover, so that compared with an arc surface, the material is reduced, the area between every two adjacent bosses is increased, and the thermal crack fault caused by large tensile stress when aluminum liquid is solidified due to too small space is avoided. The outer side circumference of the main shaft bearing hole is provided with reinforcing ribs, so that the strength of the shell is ensured.

The utility model is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, the embodiment of the utility model discloses a transmission rear cover shell, which comprises a shell body, a plane 1, an arc concave surface 2 and a plurality of reinforcing ribs 3.

Example 1

The utility model discloses an embodiment, wherein a main shaft bearing hole is formed in a shell, a plurality of middle shaft bearing holes are formed in two sides of the main shaft bearing hole, a plurality of bosses are arranged on the outer sides of the main shaft bearing hole and the middle shaft bearing holes, two groups of adjacent bosses in the bosses of the main shaft bearing hole are respectively provided with a bolt hole and an oil hole, and the side walls of the two bosses are connected into a whole through an arc concave surface 2; the shape of the side wall of the boss close to the main shaft bearing hole boss and the adjacent intermediate shaft bearing hole boss is a plane 1 vertical to the rear cover shell.

The middle shaft bearing hole disclosed in the embodiment has 2, six bolt holes and one oil hole which are connected with the rear bearing cover of the main shaft are distributed on a boss of the main shaft bearing hole, one bolt hole is adjacent to the oil hole, and the two bosses are connected into a whole through the arc concave surface 2.

Example 2

The difference between this embodiment and embodiment 1 is that a reinforcing mechanism is disposed outside the main shaft bearing hole, the reinforcing mechanism includes a plurality of sets of reinforcing ribs 3, and the reinforcing ribs 3 are circumferentially disposed outside the main shaft bearing hole. The width of the reinforcing rib 3 is 5-7 mm.

The utility model also discloses another embodiment, wherein the width of the reinforcing rib 3 is 6 mm. Simultaneously, the reinforcing ribs 3 and the shell are of an integrated structure and are formed by die casting.

The radian of the arc-shaped concave surface ranges from R2 to R6 mm.

The arc of the arcuate concave surface in this embodiment is R2 mm.

In the embodiment, compared with the existing rear cover shell, the through shaft power takeoff device has the advantages that the reserved structural characteristics of the original structure are eliminated, and the casting quality is improved.

The strengthening rib 3 is provided with 10 groups altogether, and the circumference sets up the outside at the main shaft bearing hole, is radial.

On the premise that the connecting size and the assembling size of the aluminum alloy rear cover shell and each part are not changed, the embodiment of the utility model carries out structural optimization processing on casting defect parts, improves and designs unreasonable structural parts such as rib arrangement, local space undersize and too deep regions, long and narrow regions and the like, and concretely improves the following steps:

firstly, aiming at the problems that the area between a main shaft bearing hole boss at the position of an original rear cover shell and a bolt boss of an adjacent middle shaft bearing hole is too small, the bottom of the area between the main shaft bearing hole boss and the bolt boss is subjected to tensile stress when feeding is carried out in the casting process, and thermal cracks are easily caused by tensile cracking, the side wall of the boss of the main shaft bearing hole close to the middle shaft bearing hole is flattened, the original cambered surface is changed into a plane, and the space between the main shaft bearing hole and the middle shaft bearing hole is enlarged.

Secondly, to the boss of original back lid casing department main shaft dead eye setting up oilhole and bolt hole between the wall thickness too thick, the gas pocket defect is serious, changes into the design of following the type to its position, and the outer wall of two bosss that set up oilhole and bolt hole passes through the arc concave surface and connects, makes the whole wall thickness of two bosss even, solves gas pocket shrinkage cavity defect problem, avoids the gas pocket to add the scheduling problem that the bubble appears in inside man-hour.

Meanwhile, in order to solve the problem of cracking of the boss of the main shaft bearing hole after sale, a circle of reinforcing ribs of the boss of the main shaft bearing hole is redesigned.

Meanwhile, compared with the existing design, the reserved structural feature of the through shaft power takeoff of the original structure is cancelled, and the casting quality of the through shaft power takeoff is improved; the length of the reinforcing rib of one circle around the main shaft bearing hole can be further lengthened.

In conclusion, the embodiment of the utility model solves the problem of casting defects by re-optimizing the design structure on the premise of not changing other parts of the transmission assembly; through redesign strengthening rib 3, improve back lid casing intensity, further the reliability of gearbox assembly. The utility model has the advantages of compact structure, beautiful appearance, easy manufacture, good universality and convenient installation and maintenance. And the following effects are achieved:

1. the casting yield is improved by 17 percent and reaches more than 97 percent.

2. The structural strength is improved by 40%.

3. The existing interface is not changed, and other parts in the assembly are not influenced.

4. Provides design and improvement reference for similar aluminum alloy and cast iron products, and is applied to various aluminum alloy and cast iron rear cover shells.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transmission rear cover shell is characterized by comprising a shell, wherein a main shaft bearing hole is formed in the shell, a plurality of middle shaft bearing holes are formed in two sides of the main shaft bearing hole, and a plurality of bosses are circumferentially arranged on the outer sides of the main shaft bearing hole and the middle shaft bearing holes;

the boss of the main shaft bearing hole is provided with bolt holes and oil holes, wherein any group of bosses provided with bolt holes and the outer side wall of the adjacent boss provided with the oil hole are connected into a whole through an arc concave surface (2);

the side wall of the boss close to the main shaft bearing hole boss and the adjacent intermediate shaft bearing hole boss is in a plane (1) vertical to the main plane of the rear cover shell.

2. The transmission rear cover housing according to claim 1, wherein a reinforcing mechanism is provided outside the main shaft bearing hole.

3. A transmission rear cover housing according to claim 2, characterized in that the reinforcement means are sets of reinforcement ribs (3), said reinforcement ribs (3) being arranged circumferentially outside the main shaft bearing bore.

4. A gearbox rear cover housing according to claim 3, characterised in that the web width of the reinforcing web (3) is 5-7 mm.

5. A gearbox rear cover housing according to claim 3, characterised in that the web width of the reinforcing web (3) is 6 mm.

6. A gearbox rear cover housing according to claim 5, characterised in that the stiffener (3) is of one-piece construction with the housing.

7. A gearbox rear cover housing according to any of claims 1-6, characterised in that the arc of the curved concave surface (2) has a radius of 2-6 mm.