CN216460946U

CN216460946U - Improved gear hub shaping device

Info

Publication number: CN216460946U
Application number: CN202122234902.XU
Authority: CN
Inventors: 冯大伟; 任志军
Original assignee: Nbtm Tianjin Powder Metallurgy Co ltd
Current assignee: Nbtm Tianjin Powder Metallurgy Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-05-10
Anticipated expiration: 2031-09-15

Abstract

The utility model discloses a gear hub shaping improvement device. The method comprises the following steps: the upper punch and the second lower punch are oppositely arranged, a first gear hub limiting groove and a second gear hub limiting groove are respectively arranged at the lower end of the upper punch and the upper end of the second lower punch, and a first inner cavity and a second inner cavity which are axially communicated are respectively arranged at the centers of the upper punch and the second lower punch; the core bar is inserted into the first inner cavity and the second inner cavity, gear teeth are arranged on the periphery of the upper part of the core bar, and the gear teeth are meshed with inner splines of a gear hub to be shaped; the lower punch is sleeved outside the two lower punches; the middle die is sleeved outside the upper punch and the lower punch, the inner periphery of the middle die is provided with a third spline, and the third spline is meshed with a first spline and a second spline which are arranged on the outer peripheries of the upper punch and the lower punch; wherein, the inner walls of the first inner cavity and the second inner cavity are in clearance fit with the periphery of the gear teeth. The utility model has the beneficial effects that: simple structure, convenient processing and small difference among different batches.

Description

Improved gear hub shaping device

Technical Field

The utility model relates to the field of automobile gearboxes, in particular to a gear hub shaping improvement device.

Background

An automotive transmission is a set of transmission devices used to coordinate the rotational speed of an engine with the actual driving speed of wheels for optimal performance of the engine. The transmission can produce different transmission ratios between the engine and the wheels during the running of the vehicle. The engine can be operated in its optimum power performance state by shifting gears. The development trend of the transmission is more and more complex, the automation degree is higher and higher, and the automatic transmission is the mainstream in the future. The synchronizer is an important component of the gearbox, so that gears with different rotating speeds on the input shaft and the output shaft are synchronized, gear shifting is completed quickly and smoothly, and the dynamic property, the economical efficiency and the safety of the automobile are improved.

The gear hub is an important part of the synchronizer, and the requirements on the dimensional precision, the shape position tolerance and the mechanical performance of the gear hub are high. The gear hub is a disc-shaped part which is symmetrical on the circumference and asymmetrical in the axial direction, the depths of upper and lower web grooves are different, the outer gear disc and the middle web are thin, and the inner gear hub is thick. Because the structure shape is complex, the gear hub blank is manufactured by adopting the powder metallurgy process technology and then shaped by a special tool die, so that the size precision and the shape precision of the gear hub are improved

However, the matching mode of the core rod of the existing gear hub shaping device and the two lower punches and the upper punches is full-tooth-shaped matching, namely, inner teeth meshed with the core rod are arranged in inner cavities of the two lower punches and the upper punches, a grinding tool is easy to damage in actual production, the inner teeth and the outer teeth of the gear hubs in different batches are dislocated, and the inner cavities of the two lower punches and the upper punches need to be subjected to linear cutting of the full teeth, so that the process is complex, the cost is high, and the working time is long.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an improved gear hub shaping device, which has the advantages that the inner walls of a first inner cavity and a second inner cavity of an upper punch and a second lower punch are in clearance fit with the periphery of a gear tooth, the structure is simple, the processing is convenient, and the difference among different batches is small.

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

the upper punch and the second lower punch are oppositely arranged, a first gear hub limiting groove and a second gear hub limiting groove for limiting a gear hub to be shaped are respectively arranged at the lower end of the upper punch and the upper end of the second lower punch, and a first inner cavity and a second inner cavity which are axially communicated are respectively arranged at the centers of the upper punch and the second lower punch;

the core bar is inserted into the first inner cavity and the second inner cavity, gear teeth are arranged on the periphery of the upper part of the core bar, and the gear teeth are meshed with inner splines of a gear hub to be shaped;

the lower punch is sleeved outside the two lower punches;

the middle die is sleeved outside the upper punch and the lower punch, the inner periphery of the middle die is provided with a third spline, and the third spline is meshed with a first spline and a second spline which are arranged on the outer peripheries of the upper punch and the lower punch;

wherein, the inner walls of the first inner cavity and the second inner cavity are in clearance fit with the periphery of the gear teeth.

Preferably, the clearance between the inner wall of the first inner cavity and the periphery of the gear teeth is 0.05-0.06 mm.

Preferably, the clearance between the inner wall of the second inner cavity and the periphery of the gear teeth is 0.02-0.03 mm.

Preferably, the gear teeth are involute gear teeth.

Preferably, the peripheries of the two lower punches are provided with limit grooves distributed along the axial direction, the periphery of the one lower punch is provided with limit openings distributed along the axial direction, and the third spline penetrates through the limit openings and is matched with the limit grooves.

Preferably, the upper end of the upper punch and the lower end of the two lower punches are respectively provided with a periphery extending outwards.

The beneficial effects of utility model are that: the inner walls of the first inner cavity and the second inner cavity are in clearance fit with the periphery of the gear teeth, the structure is simple, the processing is convenient, and the difference between different batches is small.

Drawings

Fig. 1 is a sectional view of a hub truing improvement device of the present invention.

Fig. 2 is a bottom view of the upper punch of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

FIG. 4 is a top view of a second undershoot in the present invention.

Fig. 5 is a sectional view taken along line B-B of fig. 4.

FIG. 6 is a top view of the core rod of the present invention.

Fig. 7 is a cross-sectional view C-C of fig. 6.

Fig. 8 is a schematic view of the mounting of the upper punch and core pin.

Figure 9 is a schematic view of the installation of two lower punches with a core rod.

FIG. 10 is a schematic diagram of an undershoot in the present invention.

Fig. 11 is a schematic diagram of an intermediate die in the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1 to 9, in one implementation form of the present invention, to achieve the above object, the present invention adopts the following technical solutions, including:

the upper punch 110 and the two lower punches 130 are arranged oppositely, a first gear hub limiting groove 114 and a second gear hub limiting groove 134 for limiting a gear hub to be shaped are respectively arranged at the lower end of the upper punch 110 and the upper end of the two lower punches 130, and a first inner cavity 111 and a second inner cavity 131 which axially penetrate through are respectively arranged at the centers of the upper punch 110 and the two lower punches 130; the core bar 120 is inserted into the first inner cavity 111 and the second inner cavity 131, the gear teeth 121 are arranged on the periphery of the upper part of the core bar 120, and the gear teeth 121 are meshed with the internal spline of the gear hub 2 to be shaped; a lower punch 140, which is sleeved outside the two lower punches 130; the middle die 150 is sleeved outside the upper punch 110 and the lower punch 140, the inner circumference of the middle die is provided with a third spline 151, and the third spline 151 is meshed with the first spline 112 and the second spline 141 which are arranged on the outer circumferences of the upper punch 110 and the lower punch 140; wherein the inner walls of the first and

second cavities

111 and 131 are in clearance fit with the outer periphery of the gear teeth. Preferably, the clearance between the inner wall of the first cavity 111 and the outer periphery of the gear teeth 121 is 0.05-0.06 mm. Preferably, the clearance between the inner wall of the second cavity 131 and the outer periphery of the gear teeth 121 is 0.02-0.03 mm.

In the using process, the gear hub to be shaped is placed between the first gear hub limiting groove 114 and the second gear hub limiting groove 134, the core rod is inserted into the first inner cavity 111 and the second inner cavity 131, the lower punch is sleeved outside the two lower punches, and the middle die is sleeved outside the upper punch 110 and the lower punch 140, so that shaping can be performed.

In another embodiment, the clearance between the inner wall of the first cavity 111 and the outer periphery of the gear teeth 121 is 0.05-0.06 mm.

In another embodiment, the clearance between the inner wall of the second cavity 131 and the outer periphery of the gear teeth 121 is 0.02-0.03 mm.

In another embodiment, the gear teeth 121 are involute gear teeth.

In another embodiment, the lower punch 130 is provided with axially distributed limiting grooves 135 at the outer periphery thereof, the lower punch 140 is provided with axially distributed limiting openings 142 at the outer periphery thereof, and the third splines 151 pass through the limiting openings 142 and are engaged with the limiting grooves 135.

In another embodiment, the upper end of the upper punch 110 and the lower end of the two lower punches 130 are provided with a lower outwardly extending peripheral edge 113 and a peripheral edge 133, respectively.

In summary, according to the improved gear hub shaping device 1 of the present invention, the inner walls of the first inner cavity 111 and the second inner cavity 131 are in clearance fit with the periphery of the gear teeth 121, so that the structure is simple, the processing is convenient, and the difference between different batches is small.

While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A tooth hub shaping improvement device, comprising:

the lower punch is sleeved outside the two lower punches;

2. The improved tooth hub shaping device according to claim 1, wherein: the clearance between the inner wall of the first inner cavity and the periphery of the gear teeth is 0.05-0.06 mm.

3. The improved tooth hub shaping device according to claim 2, wherein: the clearance between the inner wall of the second inner cavity and the periphery of the gear teeth is 0.02-0.03 mm.

4. The hub shaping improvement device according to claim 1 or 2, wherein: the gear teeth are involute gear teeth.

5. The hub shaping improvement device according to claim 1 or 2, wherein: the periphery of the second lower punch is provided with limit grooves distributed along the axial direction, the periphery of the first lower punch is provided with limit openings distributed along the axial direction, and the third spline penetrates through the limit openings and is matched with the limit grooves.

6. The hub shaping improvement device according to claim 1 or 2, wherein: the upper end of the upper punch and the lower end of the two lower punches are respectively provided with a periphery extending outwards.