JPH07145860A - Method for forming vibratory force eliminating gear - Google Patents

Abstract

PURPOSE:To provide a forming method for a vibratory force eliminating gear wherein a manufacture error is prevented from production, a phase can be accurately displaced, and during engagement, a vibromotive force is eliminated. CONSTITUTION:A helical gear H having teeth 3 obliquely formed from a tooth end 2A at a given twist angle B and a given pitch P is formed. A non-interference groove 7 is formed in the periphery of a given position 4, starting from the tooth end 2A, where the pitch P between teeth 3 in the axial direction of the helical gear H is reduced to a half, so that a tooth end 2B in the same direction as that of the tooth end 2A is formed, and a tooth surface 6 is divided into tooth surfaces 6A and 6B. The non-interference groove 7 is formed in a given groove width 5 so that the tooth surfaces 6A and 6B divided from each other by the non-interference groove 7 have the same tooth widths 8A and 8B as each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a gear capable of canceling an exciting force at the time of meshing. More specifically, a helical gear or a helical gear eliminates the exciting force at the time of meshing. The present invention relates to a gear forming method that can be erased.

[0002]

2. Description of the Related Art Conventionally, in a gear mechanism, during meshing due to the meshing rigidity near the incomplete tooth portion of the tooth end and the peculiarity of the length of the meshing line (compared to the center portion of the tooth width) Exciting force is generated. This excitation force is smaller in helical gears (including helical gears in this specification) than in spur gears, but since the tooth width is finite, it always has two points at the tooth ends. Therefore, the vibration force generated at the time of meshing cannot be avoided.

As an example of a gear that produces this exciting force, a gear member 5 such as a helical gear shown in the partial sectional view of FIG.
In the helical gear h having the teeth 53 obliquely formed at the predetermined twist angle β and the predetermined pitch P from the tooth end 52 of 1,
Since the tooth width 54 is finite, the vibration force is always generated at two positions on the tooth end.

This vibrating force is as shown in the diagram of FIG.
A phase 55 is generated for each pitch, and the gear mechanism generates vibration and noise due to the meshing frequency generated by this exciting force. Therefore, there is a demand for reduction of vibration and noise generated by this exciting force.

As a conventional technique for reducing the vibration and noise in such a gear mechanism, there is a device described in Japanese Utility Model Laid-Open No. 61-161463. In the device described in this document, a plurality of gears of the same shape are coaxially fixed. In addition, a plurality of pairs of gears that are simultaneously meshed are arranged with a predetermined phase difference in the axial direction. In the gear thus configured, when looking at the spring stiffness of the teeth during meshing, the temporal variation of the spring stiffness of each tooth of the plurality of pairs is canceled by the phase difference, and the tooth stiffness as a whole is It is intended to reduce the temporal fluctuation of the spring stiffness and reduce the vibration around the shaft of the gear and the gear noise.

[0006]

[Problems to be solved by the device] However, the above-mentioned actual exploitation 61
Even if you try to manufacture multiple pairs of same-shaped gears that mesh simultaneously like -161463, it is not possible to manufacture multiple gears of exactly the same shape because gears manufactured by machining will always produce different manufacturing errors during processing. It is impossible. Even if an attempt is made to manufacture a gear with an extremely small error, a huge amount of labor and cost will be spent on extremely difficult machining, and it is difficult to realize the expected manufacturing error.

That is, a plurality of gears fixed on the same shaft center have different manufacturing errors.
Therefore, a meshing error or the like caused by a manufacturing error occurs, the gears do not mesh with each other due to an expected predetermined phase difference, or temporal variations in spring stiffness of a plurality of pairs of teeth are not canceled by each other. It is extremely difficult to reduce vibration and gear noise around the shaft.

Further, this is larger in error in large gears for ships and the like than in the conventional small gears described above. Therefore, it is more difficult to mesh the gears with a predetermined phase difference. It becomes difficult, and it is extremely difficult to reduce vibration and gear noise.

Further, since the gear structure has a structure in which a plurality of gears are provided with a predetermined phase difference in the axial direction, a plurality of structures other than the gears, such as shaft hole processing and key groove processing, are provided. Since they are present, the assembly becomes complicated and time-consuming, and a meshing error occurs due to a manufacturing error that occurs in these configurations. Therefore, it is difficult to achieve the expected vibration and gear noise reduction as with the above manufacturing error.

As described above, according to Japanese Utility Model Laid-Open No. 61-161463, it is extremely difficult to manufacture, and it is difficult to sufficiently reduce the vibration around the shaft of the gear and the gear noise due to a manufacturing error.

On the other hand, for example, when vibration or noise is large in a large gear for a ship or the like, particularly in an underwater exploration ship, etc., it adversely affects the exploration capability of the measuring equipment, making exploration difficult. However, when the above-mentioned conventional technique is adopted in such a large gear, the manufacturing error becomes larger, and it becomes impossible to cancel the exciting force.

In view of the above problems, the present invention provides a method for forming a vibrating force canceling gear capable of accurately shifting the phase without producing a manufacturing error and canceling the vibrating force at the time of meshing. It is an object of the present invention to provide a method for forming an exciting force canceling gear that can form an exciting force canceling gear even in a large gear.

[0013]

In order to achieve the above object, a method of forming a vibration canceling gear according to the first aspect of the present invention comprises:
A helical gear having teeth obliquely formed at a predetermined twist angle and a predetermined pitch from a tooth end is formed, and a predetermined position in the axial direction of the helical gear at which the pitch of the tooth from the tooth end becomes half. A non-interference groove is formed on the circumference of the tooth so as to form a tooth end in the same direction as the tooth end, and the tooth surface is divided so that the tooth surface divided by the non-interference groove has the same tooth width. In addition, the non-interference groove is formed into a predetermined groove width.

Further, a method of forming a vibrating force canceling gear according to the second aspect of the invention is to form a helical gear having teeth obliquely formed at a predetermined helix angle and a predetermined pitch from both tooth ends. Two non-interfering grooves are formed on the circumference of a predetermined position where the pitch of the teeth is halved from the both tooth ends in the axial direction of so as to form the tooth ends in the same direction as the both tooth ends. The tooth surface is divided into two parts, and the non-interference groove is cut into a predetermined groove width so that the tooth surface divided by the non-interference groove has the same tooth width on the left and right sides with respect to the center of the tooth surface. To do.

[0015]

According to the structure of the first invention, the tooth surfaces of the helical gear having the same manufacturing error are divided by the non-interference grooves to form two tooth surfaces with the tooth pitch deviated from each other by half. It is possible to form two tooth surfaces having the same tooth width with the same manufacturing error and the tooth pitch shifted by half. This helical gear is
Since two tooth flanks shifted by a half pitch are manufactured from the integrally manufactured helical gear, the error at the time of meshing is also the same on the left and right, and the error at which both tooth flanks mesh is exactly a half pitch.

Further, according to the structure of the second aspect of the invention, the left and right tooth surfaces of the helical gear having the same manufacturing error are divided by the two non-interfering grooves into the left and right sides of the center of the tooth surface, respectively. Forming the central tooth surface and the tooth surfaces on both sides with the pitch shifted by half, the manufacturing error is the same, and two left and right tooth surfaces with the same tooth width with half the tooth pitch are formed. can do. Since this helical gear has two tooth flanks that are offset by half a pitch on the left and right sides from the integrally manufactured helical gear, the error at the time of meshing is the same for both right and left, and the error between both tooth flanks for left and right Is exactly half pitch.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that in the drawings, the configuration of the left gear is denoted by A, and the configuration of the right gear is denoted by B.

FIGS. 1 (a), 1 (b) and 1 (c) are process drawings showing a method of forming a vibration canceling gear in the helical gear of the first embodiment, and FIG. 2 is the same embodiment. FIG. 3 is a half cross-sectional view showing a helical gear formed by, and FIG. 3 is a diagram showing an exciting force generated by the helical gear.

First, referring to FIG. 1, the steps of the helical gear forming method will be described. As shown in FIG.
A helical gear H having teeth 3 obliquely formed at a predetermined helix angle β and a predetermined pitch P is formed from one of the tooth ends 2A of the one 1, and as shown in FIG. In the axial direction, the pitch P between the one tooth end 2A and the tooth 3 is half,
That is, the non-interference groove 7 is formed on the circumference of the predetermined position 4 having the half pitch p so as to form the tooth end 2B in the same direction as the tooth end 2A.
To separate tooth flank 6 into tooth flank 6A and tooth flank 6B, and as shown in (c), tooth flanks 6A, 6B
So that they have the same tooth width of 8A and 8B.
Cut into.

A predetermined position for forming the non-interference groove 7
4 may be a position where the pitch P of the diagonally formed teeth 3 is a half pitch p, but in the first embodiment described above, a plurality of teeth can be selected from the tooth end 2 and the teeth are at a position displaced by a half pitch p. surface
The groove width is set to be near the center of 6 so that
Only 5 is a wide gear.

The helical gear H thus formed is
As shown in Fig. 2, two rows of tooth surfaces 6A, 6B having the same left and right tooth widths 8A, 8B divided by the non-interference groove 7 provided at the center of the tooth width.
Has teeth 3A, 3B that are offset by a half pitch p from each other. That is, the teeth at the tooth end 2A of the tooth surface 6A and the tooth end 2B of the tooth surface 6B
The pitch P of 3A and 3B is formed so as to deviate by a half pitch p, and the meshing between the tooth ends 2A and 2B deviates by a half pitch p.

This means that, as shown in FIG.
Assuming that 3A produces a vibration force of phase 9A and meshes,
The non-interference groove 7 provided at the center of the tooth width causes the teeth 3B to mesh with each other while generating the vibration force of the antiphase 9B, so that the teeth 3A and 3B formed on the respective tooth surfaces 6A and 6B have a half pitch. p, that is, there is a start point and an end point that are engaged with each other while shifting by 180 °, and the phases 9A and 9B indicating the vibration force of the teeth 3A and 3B are in opposite phases to each other. They are offset, and as a result, the vibration force at the time of meshing of the entire helical gear H is canceled.

That is, by shifting the start point and the end point of the teeth 3A, 3B by a half pitch p, the exciting forces generated by one helical gear H are displaced so as to cancel each other, and theoretically the exciting force is An oscillating force canceling helical gear H of zero is formed.

Further, according to the present invention, after forming the helical gear H from the integral gear member 1 as in the first embodiment,
Since the tooth surfaces 6A, 6B are out of phase with each other, the manufacturing error of the helical gear H itself is a common error for both tooth surfaces 6A, 6B. You don't have to spend a lot of effort and money.

Further, in the axial direction of the helical gear H in which the teeth 3 are formed, a non-interference groove 7 is provided at a predetermined position 4 where the pitch P of the teeth 3 from one tooth end 2A becomes half, and a tooth surface is provided. Since 6 is divided, it is possible to easily process the tooth surfaces 6A and 6B that are deviated from each other by a half pitch p accurately, and to form a vibrating force canceling helical gear H without enormous labor and cost. You can

Next, a method of forming the motive force canceling gear in the helical gear of the second embodiment will be described based on the process diagrams shown in FIGS. 4 (a), (b) and (c). In the following description, the gears on both sides will be denoted by A, and the gears at the center will be denoted by B in the drawings.

First, as shown in (a), a helical gear D having teeth 13 diagonally formed at a predetermined helix angle β and a predetermined pitch P is formed from both tooth ends 12A of a gear member 11 having a predetermined width. Then, as shown in (b), in the axial direction of the helical gear D, on the circumference of the predetermined position 14 where the pitch P of the teeth 13 becomes half from the both tooth ends 12A toward the center, Both tooth ends 12
The non-interfering groove 17 is machined so as to form the tooth end 12B in the same direction as A, and the tooth flank 16 is divided into the tooth flanks 16A on both sides and the tooth flank 16B at the center, as shown in (c). So that the above non-interference groove
The non-interference groove 17 is cut into a predetermined groove width 15 so that the tooth surfaces 16A, 16B divided by 17 have the same tooth widths 18A, 18B on the left and right sides with respect to the center of the tooth surface. The middle groove 20 is a tool escape space necessary for forming the teeth 13.

The helical gear D thus formed is
Non-interference grooves 17 provided on the left and right sides with respect to the center of the tooth surface 16.
Tooth surfaces with the same tooth width of 18A and 18B divided by
16A and 16B have teeth 13A and 13B which are offset from each other by a half pitch p. That is, the pitch P of the teeth 13A and 13B at the tooth end 12A of the tooth surface 16A and the tooth end 12B of the tooth surface 16B is formed so as to deviate by a half pitch p, and the engagement between the tooth end 12A and the tooth end 12B is half. The pitch is shifted by p.

Therefore, according to the helical gear D in the second embodiment, the helical gears H in the first embodiment described above are arranged in two rows, and are formed on the respective tooth surfaces 16A, 16B. The teeth 13A, 13B have a half pitch p, that is,
It meshes while having a start point and an end point that mesh with each other while shifting by 180 °.

That is, by making the start point and the end point of the teeth 13A and 13B in opposite phases to each other, the exciting force generated in the tooth surface 16A and the tooth surface 16B is opposite in phase to each other as shown in FIG.
Since 19A and 19B mesh with each other to cancel each other, and this is performed in the same manner for the left and right sides, as a result, one helical gear D
The vibration forces generated by the self tooth surfaces 16A and 16B are canceled by each other, and the vibration force is theoretically made zero.

Also in the second embodiment, similarly to the first embodiment described above, the helical gear D is formed from the integral gear member 11 and then the tooth surfaces 16A and 16B with out-of-phase are formed. Because of the construction, the manufacturing error of the helical gear D itself is a common error of both tooth flanks 16A and 16B, and it is not necessary to spend much labor and cost to match the errors as much as in the conventional case.

Further, in the axial direction of the helical gear D in which the teeth 13 are formed, a non-interference groove 17 is provided at a predetermined position 14 where the pitch P of each tooth 13 is halved from both tooth ends 12A. Since the surface 16 is divided, the tooth surface 16A accurately deviated by a half pitch p,
The 16B can be easily processed, and the vibrating force canceling or helical gear D can be formed without requiring a great deal of labor and cost.

Also in this second embodiment, the predetermined position 14 at which the tooth surface 16 having the teeth 13 formed at an angle is divided is set to the tooth surface 16
By setting the non-interference groove 17 in the vicinity of the center and cutting the non-interference groove 17, the gear width is wider than that of the conventional gear by the width 15.

In any of the above embodiments, the tooth surfaces 6 and 16 divided by the non-interference grooves 7 and 17 need only have a sufficient area for transmitting power, and there is not much difference from the prior art. With the weight and size, it is possible to form a vibrating force canceling gear with very little vibration and noise.

Further, since the present invention is a method of forming a vibrating force canceling gear that can be easily implemented even for large gears for ships and the like, vibration and noise are reduced especially in underwater exploration vessels. By doing so, there is an effect that it is possible to secure the exploration ability.

[0036]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the invention, since the tooth surfaces of the helical gears having the same manufacturing error are divided at predetermined positions by the non-interfering grooves to form two tooth surfaces with the tooth pitch shifted by half, A vibrating force canceling helical gear having two tooth surfaces on the left and right with the same manufacturing error can be easily formed. Therefore, the error during meshing is also the same on the left and right, so the vibration forces generated on both tooth surfaces are offset by the opposite phases, and the vibration forces generated during meshing are eliminated, greatly reducing the vibration and noise of the helical gear. Can be reduced to

Further, according to the second aspect of the invention, the tooth flanks of the helical gear having the same manufacturing error are divided by the two non-interfering grooves into the left and right sides with respect to the center of the tooth flanks, respectively, and the tooth flanks at the central portion and both side portions Therefore, a vibrating force canceling or helical gear having tooth surfaces with the same manufacturing error can be easily formed. Therefore, the error at the time of meshing is also the same on the left and right, so the vibrational forces generated by the two tooth flanks formed on the left and right sides with respect to the center of the tooth flank cancel out in opposite phases, and the vibrational force generated during meshing disappears. Also in the helical gear, vibration and noise can be significantly reduced.

[Brief description of drawings]

1A, 1B, and 1C are process drawings showing a method for forming a helical gear according to a first embodiment of the present invention.

FIG. 2 is a half sectional view showing a helical gear according to the first embodiment.

FIG. 3 is a diagram showing an exciting force generated by a helical gear shown in FIG.

4 (a), (b) and (c) are process drawings showing a method for forming a helical gear according to a second embodiment of the present invention.

FIG. 5 is a half sectional view showing a conventional helical gear.

FIG. 6 is a diagram showing an exciting force generated by the helical gear of FIG.

[Explanation of symbols]

 1, 11… Gear member 2, 12… Tooth end 3, 13… Tooth 4, 14… Predetermined position 5, 15… Groove width 6, 16… Tooth surface 7, 17… Incoherent groove 8, 18… Tooth width 9, 19 ... Phase 20 ... Middle groove P ... Pitch p ... Half pitch β ... Helix angle H ... Helical gear D ... Helical gear

Claims (2)

[Claims] 1. A helical gear having teeth formed obliquely at a predetermined helix angle and a predetermined pitch from a tooth end is formed, and a pitch of the tooth from the tooth end in the axial direction of the helical gear is formed. A non-interfering groove is formed on the circumference of a predetermined position that is a half to form a tooth end in the same direction as the tooth end, and the tooth surface is divided, and the tooth surface divided by the non-interfering groove is the same. A method for forming a vibrating force canceling gear, characterized in that the non-interference groove is formed to have a predetermined groove width so as to have a tooth width. 2. A helical gear having teeth formed obliquely from both tooth ends at a predetermined helix angle and a predetermined pitch is formed, and a pitch of the tooth from the both tooth ends in the axial direction of the helical gear is Two non-interfering grooves were machined so as to form the tooth ends in the same direction as the both tooth ends on the circumference of a predetermined half position, and the tooth surface was divided, and the non-interfering grooves were used for division. A method of forming a vibrating force canceling gear, characterized in that the non-interference groove is cut into a predetermined groove width so that the tooth surface has the same tooth width on the left and right sides with respect to the center of the tooth surface.