JP2684149B2 - Dress gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a hard gear honing process using an internal tooth grindstone as a tooth surface finishing process after quenching a gear, and the diamond abrasive grains are produced every time the internal tooth grindstone processes a fixed number of works. The present invention relates to the shape and size of this dress gear used for on-machine dressing with a gear-shaped dresser (hereinafter referred to as a dress gear) coated with hard abrasive grains (electrodeposition).

[0002]

2. Description of the Related Art Generally, in hard gear honing, a work is machined by an internal tooth grindstone, and the internal tooth grindstone is dressed on a machine by a dress gear. For this reason, the dress gear is designed and manufactured with almost the same specifications as the work in order to frequently replace the work and the dress gear and to give the work characteristics to the internal tooth grindstone. To be more detailed, the main specifications are the same module, pressure angle, number of teeth, helix angle, and tooth thickness, and the outer diameter and tooth width are a little to guarantee the engagement between the work and the internal tooth grindstone. It is a large design value.

[0003]

Finally, as shown in FIG. 1, the dress gear is completed by fixing hard abrasive grains 2 such as diamond to the surface of the tooth surface 1 of the main body 3 by electrodeposition. Therefore, the tooth surface 1 of the main body 3 is finished with high precision by the gear grinder before electrodeposition, but advanced tooth grinding techniques such as the tooth profile modification shown in FIG. 2 and the tooth line modification shown in FIG. 3 are required. . In particular, gears with a small number of teeth have a small base circle diameter.
Therefore, in order to grind the specified mesh length,
Larger vehicle rotation angle (rotation angle = mesh length / base circle diameter)
I have to ask. However, the rotation angle is accurate
It requires a high-precision gear grinding machine to control
There are various types of gear grinding machines suitable for grinding gears with a small number of teeth.
It was low and expensive. Therefore, as the number of teeth decreases,
There was a problem of high strikes.

Further, the tooth profile of the internal tooth grindstone for directly working the work is trued (formed) at the same time as dressing with a dress gear. However, the smaller the number of teeth of a dress gear, the more unstable the meshing with the internal tooth grindstone (reduction of meshing ratio) and the higher. There is a problem in that it is difficult to perform accurate forming, and as a result, the shape of the work tooth profile after machining becomes large. These issues have 15 teeth
Rather than the Silurian in the following cases, small the dressing gear specifications number of teeth
It is also a harmful effect when the same work specifications are used.
Was. An object of the present invention is to provide a dress gear used for a hard gear honing process using an internal tooth grindstone as a tooth surface finishing process after quenching of a gear, particularly, a number of teeth of about 15 or less
An object of the present invention is to provide a dress gear capable of accurately forming an internal tooth grindstone that is important for obtaining a highly accurate work tooth profile.

[0005]

Means for Solving the Problems The present invention for this purpose, Her
For dress gears used for gear honing
The module and pressure angle of the dress gear tooth and the work tooth are the same.
It is a single value and the number of dress gear teeth is 1.5 times the number of work teeth.
The above-mentioned problems of the conventional technology are solved by the above.
did.

[0006]

[Embodiment] Hard gear honing, like shaving and gear shaping of internal gears, is a gear cutting by rotary motion. Therefore, if the module and pressure angles are the same, the number of teeth of each other (tool or work) is different. Utilizing the feature that the involute tooth profile can be guaranteed ,
Drain with 1.5 times the number of work teeth as the number of dress gear teeth
Since the number of gear teeth is increased, the gear grinding of dress gears
It becomes easier to grind high precision dress gears.

(Experimental example 1) Module 1.6 Pressure angle 18 ° Twist angle 38 ° Work dress gear Number of teeth 8 24 Outer diameter (mm) 20.4 55.5 Pitch circle diameter (mm) 16.243 48.730

(Experimental Example 2) Module 0.78 Pressure angle 20 ° Twist angle 20 ° Work dress gear Number of teeth 11 50 Outer diameter (mm) 11.5 43.7 Pitch circle diameter (mm) 9.365 42.567 By setting the number of work teeth to three times, and in Experiment Example 2 to 4.55 times the number of work teeth, the engagement between the dress gear and the internal tooth grindstone is stable (improvement of the engagement rate), and the internal teeth It became possible to form a grindstone with high precision.

[0009]

By implementing the present invention, the first
In addition, the meshing during dressing is increased and more stable work accuracy can be obtained. Next, it was possible to improve the cost delivery date by designing a size that was easy to manufacture. Further, if the present invention is developed, one dress gear can be used for works with various numbers of teeth. That is, the present invention provides a dress gear which can be discarded in the conventional dress gear system for each number of teeth, and which has many advantages in terms of cost and management.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view of a conventional dress gear.

FIG. 2 is a partial explanatory perspective view showing a tooth profile modification of a conventional dress gear.

FIG. 3 is a partial explanatory perspective view showing a tooth line modification of a conventional dress gear.

Claims (1)

(57) [Claims] 1. A dress gear used for hard gear honing, wherein the module and pressure angle between the dress gear tooth and the work tooth have the same value, and the number of dress gear teeth is 1.5 times or more the number of work teeth. Features
Less gear.