CN210498639U - Heavy gearbox sliding gear sleeve broaching tool - Google Patents

Abstract

The utility model provides a heavy gearbox slip tooth cover broach cutter belongs to motor transmission machining tool field, to current cutter middle part also be broach when moving straight line profile of tooth and the linking department of the profile of tooth that gradually bursts at seams, it is less because of adjacent tooth rises the broaching volume, also can receive the influence that the broaching power changed and make the chip removal produce the change to lead to the smooth work piece of pulling of broaching. The utility model discloses a solve this problem and set up double rake angle structure in straight line profile of tooth and the joining department of the profile of tooth that gradually bursts at the seams, on the graduated circle of single profile of tooth, the profile of tooth shape on upper portion is the rectangle tooth, the lower part profile of tooth is the involute tooth, two work rake angles about single broach profile of tooth becomes, rectangle tooth rake angle processing rectangle tooth is wide, involute tooth profile of tooth, this design gives enough appearance bits space in the part machining process, improve the distribution of cutting force, make the even atress of broach tooth portion in the course of working, reduce the unusual change of cutting process because of cutting atress between smear metal and cutter.

Description

Heavy gearbox sliding gear sleeve broaching tool

Technical Field

The utility model belongs to the motor transmission machining tool field, concretely relates to heavy gearbox slip tooth cover broaching tool.

Background

When a large-tonnage vehicle is loaded, a large-torque gearbox with flexible gear switching is popular among customers. With the increase of the torque of the transmission, all parts of the synchronizer of the transmission are increased along with the increase of the torque of the transmission, in order to ensure that unit switching is smooth, the internal teeth of the sliding gear sleeve of the synchronizer mostly adopt a special-shaped tooth form structure, and thus, the difficulty in processing the gear sleeve parts which are processed and formed by a tooth drawing process is brought. The processing difficulty can be effectively solved by changing the design of the cutter.

The basic processing mode of the combined tooth profile adopted in the early stage of a synchronizer sliding gear sleeve in the gearbox is broaching method forming, and the structure is in an involute spline form. In recent years, with the development of a large-torque transmission, flexible gear shifting is required under the condition of heavy load, a corresponding special-shaped tooth structure is developed from a traditional involute spline, and the size of a sliding gear sleeve in a synchronizer is correspondingly increased with the increase of the torque of the transmission. The machining of the sliding gear sleeve belongs to thin-wall parts, certain machining difficulty exists, and the difficulty of the broaching machining mode of internal tooth forming is higher and higher.

The existing internal tooth cutter structure and the tooth structure designed by a part are reverse tooth shape images, so that the cutter is limited by the tooth shape designed by the part, and cannot generate a side clearance angle (namely an included angle at a machined part in a cutting process), thereby causing the problem of accumulated chips and tooth punching under the extrusion of chips.

As shown in fig. 1, when the broaching of the conventional tool moves to the junction between the straight tooth profile and the involute tooth profile, the broaching form is changed, and although the change of the tooth portion is considered in the tool design to cross the intersection point, the broaching amount (0.03 mm per single surface) of the adjacent tooth is small, the chip removal is changed under the influence of the change of the broaching force, so that the workpiece is scratched due to unsmooth broaching. The condition of the site-damaged part is reflected, the part inlet is smooth, the part axially passes through a half part to form a pull mark, and the pull damage is increased after the part axially extends to the outlet.

Disclosure of Invention

In order to solve the problems, the utility model provides a heavy gearbox sliding gear sleeve broaching tool, wherein, the involute processing tool tooth of the broaching tool and the tool tooth at the joint of the straight line processing tool tooth have a double rake angle structure,

the double-rake angle structure is characterized in that on a single tooth-shaped reference circle, the upper tooth profile is a rectangular tooth, the lower tooth profile is an involute tooth, an upper working rake angle and a lower working rake angle are formed on a single broach tooth, the rectangular tooth rake angle is processed to be a rectangular tooth width, the involute tooth profile is processed on the involute tooth rake angle, and the double rake angles on the same cutter form two broaching planes.

The utility model has the advantages that:

the main broaching tooth section of the cutter is improved, so that the transition is stable, and the tooth beating phenomenon caused by the change of the instantaneous tension during broaching is avoided. The improved process is tested by on-site actual processing, the processing condition is stable, the vibration sound in the broaching process is stable, and the chip removal condition of the cutter is obviously improved.

Drawings

FIG. 1 is a schematic view of a connection part between a straight line and an involute of a conventional broach;

FIG. 2 is a schematic side view of a dual rake angle configuration;

FIG. 3 is a schematic front view of a dual rake angle configuration;

FIG. 4 is a schematic view of a small-diameter centering involute spline broach;

FIG. 5 is a cross-sectional view of a minor-diameter centering involute spline broach B-B;

fig. 6 is a partially enlarged view of fig. 5.

Detailed Description

Example 1

As shown in fig. 2 and 3, in the present embodiment, a heavy duty transmission sliding sleeve broaching tool is provided, wherein the tool tooth at the joint of the involute machining tool tooth and the straight machining tool tooth of the broaching tool has a double rake angle structure,

the double-rake angle structure is characterized in that on a single tooth-shaped reference circle, the upper tooth profile is a rectangular tooth, the lower tooth profile is an involute tooth, an upper working rake angle and a lower working rake angle are formed on a single broach tooth, the rectangular tooth rake angle is processed to be a rectangular tooth width, the involute tooth profile is processed on the involute tooth rake angle, and the double rake angles on the same cutter form two broaching planes.

In the machining process, the broaching plane is divided into an upper part and a lower part by taking a reference circle as a boundary, the rake angle of the upper part of the cutter is designed to be 20 degrees, and the rectangular tooth profile is broached; the design angle of the front angle of the lower cutter is 15 degrees, the involute tooth profile part is subjected to broaching, a layered machining condition is formed, and a double-angle layered working principle suitable for the broaching process is constructed by the double-front angle and a broaching plane.

The working principle is as follows:

the method is characterized in that a sectional design is carried out according to the rectangular tooth width and the involute tooth width of a part, starting from the middle part of a rough cutting tooth tool, a tool tooth at the joint of a straight line of the rectangular tooth width and an involute forms a double rake angle layered processing principle, sufficient chip containing space is provided for the part in the processing process, the distribution of cutting force is improved, the tooth part of a broach is uniformly stressed in the processing process, and the abnormal change of the cutting force caused by chips and the cutting force between tools in the cutting process is reduced.

Claims (1)

1. A heavy gearbox sliding gear sleeve broaching tool is characterized in that the tool teeth at the joint of involute processing tool teeth and linear processing tool teeth of the broaching tool have a double rake angle structure,

the double-rake angle structure is characterized in that on a single tooth-shaped reference circle, the upper tooth profile is a rectangular tooth, the lower tooth profile is an involute tooth, an upper working rake angle and a lower working rake angle are formed on a single broach tooth, the rectangular tooth rake angle is processed to be a rectangular tooth width, the involute tooth profile is processed on the involute tooth rake angle, and the double rake angles on the same cutter form two broaching planes.

Images