JP2010181013A - Configuration of double conical involute gear and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: because high accuracy is required in phase difference control of opposite gears in manufacturing a conventional herring-bone gear (double helical gear), an abrasive wheel has to be provided with a recess at the center because of restrictions required by machining and the shape is disadvantageous in reduction of weight. <P>SOLUTION: A double conical involute gear comprises two conical involute gears arranged opposite to each other to mutually offset thrust forces generated. Thus, accuracy control on manufacturing is simplified, a large amount of labor related to this is eliminated, and the weight of a gear is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a configuration and a manufacturing method of a double conical involute gear.

  An example of a power transmission system that does not generate a thrust force is an angle gear in which two helical gears are arranged to face each other. An angle gear is used in many gear devices in various fields as one of power transmission systems.

JP 2002-364732 A

  Since there are two helical gears, the angle gear (double helical gear) must be configured so that there is no phase difference except in special cases.

As one of the methods of constituting the angle gear, there is a method of separately manufacturing and assembling two helical gears. In this case, a great deal of cost is required to accurately manage the phase difference.
As another method, in the case of integral molding as shown in FIG. 2, a groove for tool escape is required between two opposing helical gears, which increases the mass of the gear itself, It becomes a factor of manufacturing cost rise. Moreover, much labor is required also in the surface which manages the phase difference of the tooth | gear which opposes like the above-mentioned division | segmentation system.

  An object of the present invention is to provide a gear that is easy to manufacture and inexpensive, by solving the problems of conventional angle gears using a double conical involute gear.

  According to the first aspect of the present invention, two conical involute gears are used to dispose the generated thrust forces so as to cancel each other (hereinafter referred to as a double conical involute gear). It is.

  According to a second aspect of the present invention, in the double conical involute gear according to the first aspect, about one of the gears to be meshed, a clearance groove required for processing is not required in the central portion of the gear. The gear device is characterized.

  According to a third aspect of the present invention, in the double conical involute gear according to the first aspect, one of the gears to be meshed is manufactured without making a clearance groove necessary for processing at the center of the gear. It is a manufacturing method of an involute gear.

  According to a fourth aspect of the present invention, in the double conical involute gear according to the first aspect, the position accuracy can be managed.

  According to a fifth aspect of the present invention, in the gear cross-sectional view of the double conical involute gear according to the first aspect, the tooth outer diameter and the root diameter are tapered.

  According to a sixth aspect of the present invention, there is provided a method for producing a double conical involute gear, wherein the double-conical involute gear according to the first aspect of the present invention is manufactured with the tooth outer diameter and the root diameter tapered.

  According to a seventh aspect of the present invention, in the gear sectional view of the double conical involute gear according to the first aspect, the tooth outer diameter is a straight shape and the tooth root diameter is a tapered shape. is there.

  According to the invention of claim 8, the double conical involute gear manufactured in the gear cross-sectional view 5 of the double conical involute gear according to claim 1 having a tooth outer diameter of a straight shape and a tooth root diameter of a taper shape. It is a manufacturing method.

  According to the ninth aspect of the present invention, in the gear cross-sectional view of the double conical involute gear according to the first aspect, the tooth outer diameter and the root diameter are straight shapes.

  According to a tenth aspect of the present invention, there is provided a method for producing a double conical involute gear, wherein the double-conical involute gear according to the first aspect of the present invention is manufactured by making the tooth outer diameter and the root diameter straight.

In the manufacture of conventional angle gears (double helical gears), high precision is required for the phase difference management of the opposing gears, and due to processing constraints, a grinding wheel relief must be provided in the center. In the case of reducing the weight of the device, it was an unfavorable shape.
Therefore, two conical involute gears are made to face each other, and the thrust force generated is arranged so as to cancel each other, thereby simplifying the accuracy control in manufacturing and eliminating the great labor involved in this, Reduce gears.

It is explanatory drawing which showed the shape (the 1) and structure of a double conical involute gear. It is explanatory drawing which showed the structural example of the angle gear. It is explanatory drawing which showed the manufacturing method of a double conical involute gear. It is explanatory drawing which showed the processing method of the double conical involute gear. It is explanatory drawing which showed the shape (the 2) of a double conical involute gear. It is explanatory drawing which showed the shape (the 3) of a double conical involute gear.

  The problem is solved by using two conical involute gears.

FIG. 1 shows a configuration of a double conical involute gear for achieving the above object.
1a is an integrally molded gear. Reference numerals 2a and 2b denote a single conical involute gear left part and a conical involute gear right part, but they constitute a pinion by facing each other.

  In the conventional angle gear as shown in FIG. 2 (pinion 3 of angle gear, gear 4 of angle gear), a groove for tool escape is essential at the center of the opposing helical gear. In addition, when grinding is finished, it takes a lot of time to manage the phase difference between the opposing helical gears on the machine tool side due to the characteristics of the helical gear tooth profile.

  On the other hand, in the case of a double conical involute gear, as shown in FIG. 4, it can be seen that the tool 6 moves along the locus 7 of the tool and does not require a tool escape due to the feature of the tooth profile. In addition, since the operation of the machine tool is basically a one-pass operation, it is easy to manage the phase difference between the conical involute gears facing each other.

By the way, since the gear 1a is convex, it can be integrally molded, but the pinions 2a and 2b to be meshed with each other are concave and cannot be integrally molded. Therefore, as shown in FIG. 3, facing each other like the gear 1a, the knock pins 5a and 5b are incorporated before gear cutting, and gear cutting and grinding finishing are performed. Management of the phase difference of the conical gear is easy as shown by the gear 1 described above.
After processing, the knock pins 5a and 5b are disassembled, the pinions 2a and 2b are set in the normal orientation as shown in FIG. 1, the knock pins 5a and 5b are assembled again, and the shaft 2c is assembled. There is no phase difference, and a highly accurate double conical gear is completed.

  As described above, according to the present invention, it is possible to provide an inexpensive, lightweight product that is easy to manufacture without requiring much labor for the phase position of teeth.

1a gear 1b shaft 2a pinion (conical involute gear left)
2b Pinion (right side of conical involute gear)
2c shaft 3 pinion of angle gear 4 gear of angle gear 5a, 5b knock pin 6 tool 7 tool trajectory

Claims (10)

A gear device characterized in that two conical involute gears are arranged so as to cancel out the generated thrust forces. (Hereafter, the name will be double conical involute gear.) 2. A gear device according to claim 1, wherein one of the gears to be meshed does not require a clearance groove required for processing at the center of the gear. 2. The double conical involute gear according to claim 1, wherein one of the gears to be meshed is manufactured without forming a clearance groove necessary for machining at the center of the gear. Method. The double conical involute gear according to claim 1, wherein position accuracy can be managed. The gear section of the double conical involute gear according to claim 1, wherein the tooth outer diameter and the tooth bottom diameter are tapered. 2. A method of manufacturing a double conical involute gear according to claim 1, wherein the tooth cross section of the double conical involute gear has a tapered outer shape and a root diameter. The gear section of the double conical involute gear according to claim 1, wherein the tooth outer diameter is a straight shape and the tooth root diameter is a tapered shape. 2. The method of manufacturing a double conical involute gear according to claim 1, wherein the tooth outer diameter is a straight shape and the root diameter is a tapered shape in the gear cross section of the double conical involute gear. The gear section of the double conical involute gear according to claim 1, wherein the tooth outer diameter and the tooth root diameter are straight. 2. A method of manufacturing a double conical involute gear according to claim 1, wherein in the gear cross section of the double conical involute gear, the tooth outer diameter and the root diameter are formed in a straight shape.

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