JPS627895Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device designed to prevent rattling noises in a gear transmission mechanism.

More specifically, in a gear transmission mechanism in which a plurality of idle gears that mesh with a drive gear and a driven gear are arranged on the same shaft, a sub-gear having a different number of teeth is provided on the opposing inner surface of each idle gear. This is provided so as to be frictionally engaged with each other through a pressure means, to prevent hammering noise caused by bumping between the meshing gears and to prevent frictional noise caused by the interposition of the sub-gear.
The present invention relates to a power transmission device designed to accomplish the above with a simple structure.

Between the teeth of the gears that make up the gear transmission mechanism, there is a cross crash to prevent wear on the teeth, and therefore the presence of this cross crash generates a meshing banging sound when the gears mesh and transmit power, which generates meshing banging sound. In a gear mechanism in which a drive gear and a driven gear are connected by an idle gear, this banging sound is generated on both the drive side and the driven gear side, and these sounds are compounded to become a loud noise, and the teeth are damaged and worn down by the impact when meshing.

Therefore, it has been proposed to frictionally engage a sub-gear with a different number of teeth to a gear so that a portion of the teeth of the sub-gear are exposed between the teeth of the main gear, thereby eliminating bumps and knocking sounds. In such a means, assuming a gear train in which there is one main gear and two other gears are meshed with it, and sub-gears are arranged on both sides of the main gear to eliminate backlash with two other gears, each Due to the arrangement of the spring for frictionally engaging the sub gear with the main gear, it is necessary to prevent the load from becoming unstable due to slippage on the inner or outer periphery, and to prevent variations in the set length of the spring. Similarly, in order to prevent instability, the sub gear is held down by a set plate that is fixed to the main gear with a pin or the like so that they rotate together, and is further compressed by a spring, and is equipped with a spring locking means. There are problems such as the structure becomes complicated as two sets are required, and it is difficult to ensure equal set loads of the springs despite the above.

The present inventors devised the present invention in order to solve the problem of meshing noise due to backlash in a gear transmission mechanism using an idle gear, and the above-mentioned problems when a sub-gear is used therein.

The purpose of this invention is to effectively eliminate meshing noise generated between each gear in a gear transmission mechanism consisting of a drive gear, an idle gear, and a driven gear, as well as to eliminate friction noise caused by interposing a sub-gear. In addition, to provide a power transmission device designed to have a simple structure with a minimum number of parts.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a gear transmission mechanism to which the present invention is applied, and 1 is a drive gear supported by a shaft 2;
3 is a driven gear supported by a shaft 4, an intermediate shaft 5 is provided between the gears 1 and 3, and an idle gear is provided on the intermediate shaft 5.

2 is a vertical cross-sectional view of the gear transmission mechanism, with the drive gear and driven gear shown side by side for ease of explanation. Two idle gears 6, 7 that mesh with the drive gear 1 and driven gear 3 are provided on the intermediate shaft 5, spaced apart in the axial direction, and the idle gears 6, 7 are fixed to the shaft 5 by press fitting or the like. Thin-walled sub-gears 8, 9 with a different number of teeth from the idle gears 6, 7 are provided on the same shaft 5, spaced apart in the axial direction, on the opposing inner surfaces 6a, 7a of the idle gears 6, 7.

The sub gears 8 facing each other on the above shaft 5,
Ring-shaped disc springs 10 and 11 are arranged between 9,
The outer diameter portions 10a, 11a of the disc springs 10, 11 are brought into contact with the opposing inner surfaces of the sub gears 8, 9. A thrust washer 12 movable in the axial direction is interposed on the shaft 5 between the inner diameter portions 10b and 11b which play with the shaft 5 of the disc springs 10 and 11. The disc springs 10 and 11 connect the sub gears 8 and 9 to the idle gears 6 and 9.
7 and is pressed against the opposing inner surfaces 6a, 7a, and is brought into frictional engagement therewith.

By the way, when the drive gear 1 is driven, the idle gear 6 and sub gear 8 that mesh with it are driven, and the shaft 5
Power is transmitted to. The idle gear 7 and the sub gear 9 on the same axis are driven, and the power is transmitted to the driven gear 3 that meshes with the idle gear 7 and the sub gear 9.

In the above, the idle gears 6 and 7 are equipped with sub-gears 8 and 9, which are frictionally engaged and have different numbers of teeth, so that the teeth of the sub-gear face between the teeth when meshing power is transmitted with the other gear, resulting in meshing. The buckles provided between the teeth are removed, and the meshing sound generated by the buckles is eliminated. In this way, the meshing noise caused by the bumps generated between the meshing teeth of gears 1 and 6 and gears 3 and 7 is eliminated, thereby reducing and suppressing the meshing noise of the gear transmission mechanism.

By the way, the springs 10, which frictionally engage the sub gears 8, 9 with the idle gears 6, 7 of the counterpart,
11 is a thrust washer 1 near the inner diameter of this.
2, which is movable in the axial direction and is interposed between them, prevents variations in the load caused by the instability of the set height of each spring and the load characteristics of the two springs 10 and 11. The resulting variations are absorbed by the sliding movement of the washers 12, and the variations in the springs 10, 11 are compensated for, equalizing the load, and therefore the sub gears 8, 9.
The frictional forces on the opposing gears 6 and 7 are equal. Since the washer 12 is interposed between the springs 10 and 11, the sliding surfaces on the shafts of the springs 10 and 11 act on the inner diameter side, and the instability of the slip load caused by binding can be eliminated, and the spring load is also uniform as described above. It is stable, and the friction force can be easily and reliably managed with washers, and the friction noise between the other gear and the sub gear can be eliminated.

FIG. 3 shows a modified embodiment of the invention, in which the shaft 105
Idle gear 106,1 provided spaced above
07 have different numbers of teeth, and sub gears 108 and 109 are arranged on the opposing inner surfaces of 106 and 107, respectively,
When disc springs 110 and 111 are provided, sub gears 108 and 109 must be slipped separately, but in this case, the washer is divided into two in the axial direction to enable slipping. That is, two thrust washers 112-1 and 112-2 are interposed in the axial direction, and their opposing surfaces are slidably abutted against each other. By doing so, the same action and effect as above can be obtained. This situation is not limited to this situation, and can be solved by providing two intermediate washers, which require separate movements of the sub-gears, as described above.

As is clear from the above, according to the present invention, it is possible to effectively prevent meshing noise caused by bumping between the drive gear, the driven gear, and the idle gear in the gear transmission mechanism of the drive gear, idle gear, and driven gear system. . In particular, a sub-gear is provided between the opposing inner surfaces of the two idle gears, and a spring is interposed between the sub-gears via a washer, which eliminates the slip load caused by jamming and reduces the frictional force between the sub-gear and its counterpart. This makes it possible to easily and reliably equalize the spring load, which requires the most management, and to make it easier to manage and evenly keep it within a predetermined value.It also suppresses and eliminates friction noise when using sub-gears. obtain. In addition, as described above, the sub-gear is placed inside the idle gear, and the disc spring or the like is placed back-to-back between the sub-gears through the washer to obtain the above effect. Therefore, the structure is simple and easy to assemble, and is inexpensive. It is possible to achieve the intended purpose.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is an explanatory diagram of a gear transmission mechanism, Fig. 2 is a longitudinal cross-sectional view of the same, and is shown for convenience of explanation in a developed manner, and Fig. 3 is an illustration of a gear transmission mechanism of the present invention. FIG. In the drawing, 1 is a drive gear, 3 is a driven gear, 5 is an intermediate shaft, 6 and 7 are idle gears, and 8 and 9
1 is a sub-gear, and 10 and 11 are disc springs serving as compression means.

Claims (1)

[Scope of utility model registration request] In a gear transmission mechanism that includes a plurality of idle gears on the same intermediate shaft that mesh with each of a drive gear and a driven gear, a sub gear having a different number of teeth from the idle gear is rotatably arranged on the opposing inner surface of each idle gear. and each sub-gear meshes with each of the drive gear and driven gear together with an idle gear, and an elastic pressure having an elastic force in the axial direction of the intermediate shaft is provided on the opposing inner surfaces of each of the sub-gears on the intermediate shaft. The members are rotatably fitted to each other, and further, a cylindrical support member is fitted between the opposing inner surfaces of each of the elastic members on the intermediate shaft so as to be movable in the axial direction, and the elastic force of each of the elastic members is fixed. A power transmission device that equalizes force and frictionally engages each of the sub gears with an idle gear.