JPS5926666A - Gear noise preventing method for gear means - Google Patents

Abstract

PURPOSE:To eliminate useless power consumption under any load conditions of gears including no-load operation of the same, by providing a pair of forcing gears in addition to a driving gear and a driven gear, and connecting the forcing gears to the driving gear by a resilient member imparted with torsional displacement. CONSTITUTION:A driving gear 13 is fixed on a driving shaft 11 and held in mesh with a driven gear 14 fixed on a driven shaft 12. A resilient shaft 15 is extended from the driving shaft 11, and a forcing gear 16 fixed on the shaft 15 is held in mesh with the other forcing gear 17 fixed on the driven shaft 12. Further, a pair of said forcing gears 16, 17 are fixed on respective shafts 15, 12 in the manner that the resilient shaft 15 is forcedly imparted with a prescribed torsional displacement.

Description

[Detailed description of the invention] The present invention relates to a method for preventing tooth striking in a gear device.

In this statement, tooth striking refers to when a pair of gears is transmitting rotational power, when the contact between the meshing tooth surfaces of the driving gear and driven gear separates due to torque fluctuations, etc.
After that, they come into contact again, and by repeating such separation and contact, a phenomenon similar to hitting the tooth surface occurs.This phenomenon is especially true when a reciprocating engine such as a diesel engine is used as the driving power source. There is a strong possibility that this will occur when

It is well known that the phenomenon of tooth striking causes wear or damage to tooth surfaces, which can lead to serious accidents in gear systems, and also causes noise generation.
Therefore, various Q countermeasures have been conventionally implemented for gear devices, particularly gear devices used for power transmission of reciprocating engines, in order to prevent this.

For example, Jitsukai Sho-O/-ri/θ7 No. Otsu's [Abnormal Noise Prevention Device for Gear Transmission Device], or Jitsukai Sho! Goo 3/7t
! The "gear tooth striking prevention device" of the '/ publication is related to a technique for preventing the tooth striking phenomenon that occurs in the above-mentioned gear devices. Including, the former's actual F@! To briefly explain the entire structure of the one disclosed in No. 1076, Figures 1 and 10 show this in its entirety. is transmitted. The driven gear is located on the shaft 3 and is provided to be slidable in the axial direction. The transmitted power acting on the tooth surface of the driven gear 2 is formed into a helical bar so that the component force in the direction of the gear shaft is in the direction of arrow 'IV' in the figure, and therefore, as the transmitted power increases, , the driven gear on the shaft 3 slides in the direction of arrow "V" against the spring. Conversely, when the transmitted power decreases, the driven gear is pushed by the spring and slides in the direction of arrow "Wn". Sliding on the inner surface of the friction! When the degree of zero-retention progresses further to the point where the elastic ring O engages with the frictional outer surface 2 of the elastic ring O, the rotation of the elastic ring O is completely prevented by the deformation of the elastic ring O and the action with the ball, thereby causing the driven gear to Since the braking action is applied to the gears, all the play that occurs between the tooth surfaces of both gears during no-load operation is absorbed, thereby preventing the generation of abnormal noise.

Note that T is a fixed plate for supporting one end of the shaft 3, Iff, and /θ is a fixed member that is fixed to the fixed plate and supports the elastic ring B so as to be fully rotatable.

As is clear from the above configuration and operation, the prior art applies a braking force to the driven gear to prevent the tooth-trimming phenomenon, whereas the prior art applies a braking force to the driven gear to prevent the tooth-tripping phenomenon.
By creating a braking force in a light load state and removing the sound range of the braking force as the load increases, this eliminates the waste and blindness of the conventional method, which causes braking effort to be applied regardless of the increase or decrease in load. This was done in order to reduce this.

Keita, Mikiaki S Goo 3/7? The one in Publication No. 1 detects the increase or decrease in the load transmitted to the driven shaft system to which the driven gear belongs, and engages a clutch for connecting a rotational resistor provided on an extension of the shaft system according to the load. It is designed to control the release operation, and its technical idea is similar to the former prior art, and these conventional technologies, including the former,
Problems include that the structure is complicated and the problem of power consumption under light load conditions remains unsolved.

The purpose of the present invention is to realize a method that eliminates wasted power in all load conditions including no-load conditions and prevents gear rattling using a simple configuration. This is because, in a gear device that uses a pair of gears, a drive gear and a driven gear, to transmit power from the drive shaft to the driven shaft, the other pair of forcing gears are connected to the drive shaft and the driven gear. The forcible gears are fixedly fixed to each of the shafts and meshed with each other, and the relative rotational phase between the two wheels is restricted by the engagement of the driving gear and the driven gear due to the meshing of the forcing gears. The initial pushing force in a constant rotational direction acts steadily between the meshing tooth surfaces of the driving gear and the driven gear. They are connected by an elastic material, and the elastic material is attached under a fully forced displacement condition to generate the above-mentioned initial pushing force.

Next, the configuration of the method of the present invention will be specifically explained below based on the drawings showing embodiments.

In Figures 1, 2 and %3, /l is the drive shaft;
/λ is a driven shaft, /3 is a driving gear fixed to the driving shaft //, /4t is a driven gear fixed to the driven shaft /2,
A pair of gears/3. Power is transmitted from the drive shaft // to the driven shaft /2 by the meshing of the /2. /! is an elastic shaft as an elastic material, and is provided on an extension of the drive shaft //. /6
and /Z are a pair of forcing gears that mesh with each other, the forcing gear /6 is fixed on the elastic shaft lj, and the other forcing gear /7 is fixed on the driven shafts /, 2. Moreover, force gear/4. The locking phase on each axis of /7 is as shown in Fig. 2 and gIJ3.
When the tooth surface /3a of the driven gear /g and the tooth surface /g of the driven gear /g come into contact with each other at the point P and power is transmitted by the push force in the direction of the arrow "P++", the screen of the forcing gear /B /
The elastic shaft/O is set so that B and the tooth surface/7a of the other forcing gear/7 come into contact with each other at point Q and constantly act on the initial pushing force in the direction of the arrow "g-". Gears on their respective axes with a predetermined torsional displacement
≦, /7 solid phase is performed.

By configuring in this way, the arrow II P! While the power is being transmitted in one direction, even if the tooth surface /3a and the tooth surface /g try to separate due to torque fluctuation, the initial pushing force in the direction of the arrow 'Ig-'' The reaction force acts as a pushing force in the direction of arrow n!'' at point P through the elastic axis/reaction, and acts in a direction to completely prevent separation between the tooth surfaces. That is, the initial pushing force in the II g and n directions is
It acts on the driven shaft /2 through the forcing gear /7 in the direction of reducing the °C transmitted power, but the reaction force is the elastic shaft /! The power is returned to the drive side via the closed circuit, and the power is simply circulated within the closed circuit, so no power is wasted.

FIG. 7 provides an easy-to-understand explanation of this relationship. In the figure, curve A shows the torque fluctuation of the drive shaft when the torque fluctuation is relatively small, and curve B shows the torque fluctuation when the torque fluctuation is relatively large. Assuming that the torsional torque due to the transmitted power is T, in the case of curve A, no tooth striking phenomenon occurs on the tooth flanks, but in the case of curve B, tooth striking phenomenon occurs between the meshing tooth flanks at the vertical line portion C. On the other hand, it is an aim of the present invention to move the transmitted power upward by the torsional torque Tffid by applying the forcing gear having the above-mentioned configuration. It will be buried within the torque range.

As a result, even when torque fluctuations are large, it is possible to prevent the occurrence of tooth knocking between gears.

In this case, it goes without saying that the amount of increase d in the torsional torque can be set freely depending on the amount of torque fluctuation that occurs.

7- Figures 5 to 7 show different embodiments, in which a pair of forcing gears are connected to each other by an elastic material. / is a force gear fixed to the drive shaft //, and the outer ring /? -/ and inner ring/♂-2 and inner ring/
? -2 is the outer ring/? -/ can freely slide between each other in the circumferential direction. /9 is a sheath spring, which is housed in a hole commonly provided on the sliding surfaces of the inner and outer rings, and functions as an elastic material that interconnects the inner and outer rings.0 Figure 7 shows the outer ring /♂- / and the inner circle /? −2 are displaced relative to each other, and as a result, the sheath spring /? indicates a state in which deformation occurs within the elastic limit. By connecting in this way, it is possible to generate an initial pushing force between the meshing tooth surfaces of the forcing gears /r and /7, as in the case of the example in Figure 1, and the same as in the example in Figure 1. A similar effect can be achieved. 0 FIG. 9 shows a further different example of water-containing, in this case a forcing gear/! It goes without saying that the same effect as in the example shown in Fig. 1 can be obtained in this case as well. Will.

Since the method of the present invention is constructed as described above, the simple construction eliminates wasted power in all load conditions including no-load conditions, and has an excellent effect in preventing gear teeth chattering. be.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of one embodiment of the method of the present invention, Fig. 2 is an enlarged view of the main parts in Fig. 1 as seen in the direction of the arrow ■, and Fig. 3 is an enlarged view of the main parts in Fig. 1. An enlarged view of the main pipe viewed in the direction of the arrow ■, FIG. 7 is a diagram for explaining the method of the present invention. Figure j is a sectional view of another embodiment of the method of the present invention, and Figure 6 is a cross-sectional view of another embodiment of the method of the present invention. Fig. 7 is an enlarged view of the main parts in the figure, Fig. 9 is a side view of another embodiment, and Fig. 9 is a conventional method. The cross-sectional view for complete explanation, the 1θ diagram, is in Figure 9! This is a sectional view taken along line -1. //... Drive shaft S/2... Driven shaft 1/3... Drive gear, /3a, /g8. / Otsu, I/7&,, tooth surface, /
10. Driven gear -/! ...Elastic shaft 17, /7.
/♂110 Force gear, /,! ″-/10.-/10
．． Outer ring 0. Inner circle, /ri09. Sheath spring, 20. ,, leaf spring. １／／−＠＠N 9 ? Demand for 4 units

Claims (1)

[Claims] In a gear device that uses a pair of gears, a driving gear and a driven gear, to transmit power from a driving shaft to a driven shaft, another pair of forcing gears are fixed to each of the driving shaft and the driven shaft. The forcible gears are meshed with each other, and the driving gear is engaged with the driving gear in a state where the relative rotational phase between the two shafts is restricted by the engagement of the driving gear and the driven gear. The forcing gears are connected to each other or the forcing gear and the driving gear or the driven gear by a sound-opening elastic material so that an initial pushing force in a constant rotational direction constantly acts between the meshing tooth surfaces of the driven gear. . A method for preventing tooth striking in a gear device, characterized in that the elastic material is installed in a state where it is forced to be displaced to generate the above-mentioned initial pushing force.