JPH05231496A - Bevel gear with web - Google Patents

Abstract

PURPOSE:To reduce weight in the state of maintaining the specified gear strength in the case of load being concentrated on the tooth tip of each tooth as in the case of the rotation of a gear being low and heavy load being applied, whereas improve gear strength in the same weight. CONSTITUTION:In the case of load being concentrated on the tooth tip of each tooth 4 as in the case of the rotation of a gear being low and heavy load being applied, the wall thickness of a web 2 at a part adjacent to the tooth tip part requiring strength most is made the largest by the web 2 formed in such a way as to be thicker toward the tip from the base part. This results in coping rationally with the force applied to the tooth 4 of the gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear with a web in which a web is formed at an outer end of a tooth portion having a plurality of teeth.

[0002]

2. Description of the Related Art Generally, when a bevel gear is manufactured by forging, the strength of the gear is increased by adding a web to the end of the tooth by taking advantage of its manufacturing method. The applicant of the present invention has proposed a new bevel gear with a web, which is capable of downsizing the gear while ensuring sufficient gear strength (see Japanese Patent Laid-Open No. 63-215329). In this bevel gear with web, the web formed on the outer end of the tooth is formed parallel to the back cone of the tooth.

[0003]

However, in these conventional bevel gears with a web, the web is evenly spread between the teeth to connect the teeth, but the above-mentioned conventional Depending on the conditions under which the bevel gear is used, especially when the gear rotation is low and a heavy load is applied, the load concentrates on the tip of each tooth, so a structure that reasonably corresponds to the force applied to each tooth. It was hard to say, and there was a problem that it caused an extra weight increase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a case where a load is concentrated on the tip of each tooth, such as a case where the rotation of the gear is low and a heavy load is applied. It is an object of the present invention to provide a bevel gear with a web that can reduce the weight while maintaining a predetermined gear strength, and can improve the gear strength under the same weight.

[0005]

In order to achieve the above object, the present invention is a bevel gear with a web in which a web is formed at the outer end of a tooth portion having a plurality of teeth, the web being formed from a base portion. It is formed so that it becomes thicker toward the tip.

[0006]

In the bevel gear with a web according to the present invention, the web formed so that the thickness increases from the base portion to the tip end causes the teeth of each tooth to be toothed as in the case where the rotation of the gear is low and a heavy load is applied. By maximizing the wall thickness of the portion of the web adjacent to the tip of the tooth, which requires the most strength when the load is concentrated first, the force applied to the teeth of the gear is reasonably dealt with.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

1 and 2 show an embodiment of the present invention. In these drawings, reference numeral 1 is a forged bevel gear. In this forged bevel gear 1, in order to avoid contact interference between the web 2 of the forged bevel gear 1 and the teeth of the mating gear to be meshed, a large number of teeth 4 are formed on the conical outer surface 3a of the boss portion 3 at appropriate intervals. A predetermined value (for example, about 0.5 mm) is extended in the direction from the regular cone distance L. The outer surface 2a of the web 2 is formed perpendicularly to the generatrix p of the reference pitch cone, and the inner surface 2b of the web 2 is formed on the outer surface 2a.
On the other hand, the web 2 is formed so as to be gradually separated toward the tip (outer side), and the web 2 is formed to be thicker toward the tip.

A bevel gear with a web 1 constructed as described above.
In that case, since the outer surface 2a of the web 2 is formed in the direction orthogonal to the generatrix p of the reference pitch cone, compared to the case where the web is projected in the direction orthogonal to the axis of the boss portion and is projected outward. The bevel gear with web does not increase in size, so that it is not necessary to increase the size of the gear box that houses the bevel gear with web. Moreover, since the web 2 is formed in a tapered shape such that the web 2 becomes thicker toward the tip (outer side), the load is applied to the tip of each tooth as in the case where the rotation of the gear is low and a heavy load is applied. When concentrated, by maximizing the wall thickness of the web 2 in the portion adjacent to the tooth tip portion of the tooth 4 requiring the highest strength, it is possible to reasonably respond to the force applied to the tooth 4 of the gear. Therefore, it is possible to reduce the weight while maintaining a predetermined gear strength, while improving the gear strength under the same weight.

FIG. 3 shows another embodiment of the present invention, in which the base 2 on the tooth 4 side of the web 2 is shown.
c is formed in a direction orthogonal to the axis of the boss portion 3 to increase the wall thickness. With this configuration, the same effects as those of the above-described embodiment are obtained, and in the forging die for molding the bevel gear 1 with web, the web 2 formed in the direction orthogonal to the axis of the boss portion 3 is formed. Tooth 2 base 2
Since the part of the mold corresponding to c becomes flat and does not project, wear of this part is small and the life of the mold can be improved.

[0011]

As described above, the present invention is a web-equipped bevel gear in which a web is formed on the outer end of a tooth portion having a plurality of teeth, and the web is thicker from the base to the tip. Since the web is formed so that the load is concentrated on the tip of each tooth, such as when the rotation of the gear is low and a heavy load is applied by the web, By maximizing the web thickness of the adjacent parts, it is possible to reasonably deal with the force applied to the teeth of the gear and to reduce the weight while maintaining the prescribed gear strength. On the other hand, the strength of the gear can be improved under the same weight.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a web unit.

FIG. 3 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 forged bevel gear 2 web 4 teeth

Claims (1)

[Claims] 1. A bevel gear with a web in which a web is formed at an outer end of a tooth portion having a plurality of teeth, wherein the web is thickened from a base portion to a tip. Bevel gear with web.