JPH0557503U - Anti-vibration bearing device for gear mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] In a gear mechanism, while preventing the meshing vibrations of gears, maintaining high rigidity of the relative positional relationship between the drive shaft and the driven shaft. [Structure] Shaft holes 4 and 5 formed parallel to the gear case 1.
The anti-vibration bearing device in the gear mechanism in which the gears 6 and 7 fixed to the drive shaft 2 and the driven shaft 3 that are fitted in the gear mesh with each other has a low rigidity in the gear case but a high damping property.
The bearing block 10 is fitted through the bearing block, and the bearings 13 and 14 that support the drive shaft and the driven shaft maintain the coaxial relationship with the drive shaft and the driven shaft in the proper meshing state of the gears. And is stuck. Gear meshing vibrations caused by input / output torque fluctuations in the transmission of rotation of the drive shaft / driven shaft and backlash of the gears are absorbed by the vibration isolator. The relative positional relationship is maintained with high rigidity by the bearing block.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an anti-vibration bearing device for a gear mechanism.

[0002]

[Prior Art]

 In a gear mechanism such as a transmission according to the related art, gear wheels 6 and 6 are provided at ends of parallel drive shafts 2 and driven shafts 3 which are rotatably supported on the gear case 1 by respective rolling bearings 13 and 14. 7 is fixed, and both gears mesh with each other (see FIG. 3). Further, in the above gear mechanism, a synthetic resin is provided between the case and the outer rings of the bearings 13 and 14 (or between the drive shaft 2 and the driven shaft 3 and the inner rings of the bearings 13 and 14) for vibration isolation. There is also a structure in which the vibration isolator 9 is fitted (see FIGS. 4 and 5).

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional gear mechanism such as a transmission, gear meshing vibration occurs due to input / output torque fluctuation, gear backlash, etc., and the vibration is transmitted to the case via the bearing and becomes noise. There's a problem.

Further, the fitting of the vibration-proof sleeve between the case and the outer ring or between the rotary shaft and the inner ring enhances the damping property of vibration, but causes a decrease in rigidity. The relative positional relationship fluctuates, the accuracy of meshing the gears decreases, and the starting force increases. As a result, noise is adversely affected. This invention provides an anti-vibration bearing device in a gear mechanism that does not have such drawbacks.

[0005]

[Means for Solving the Problems]

 The anti-vibration bearing device in the gear mechanism of the present invention is a gear mechanism in which a gear fixed to a drive shaft and a driven shaft fitted in a shaft hole formed in parallel with the gear case meshes with each other. A bearing block is fitted through a low-vibration damping material that has a high damping property, and each bearing that supports the drive shaft and the driven shaft is mounted on the bearing block. It is fixed while maintaining a coaxial relationship with the driven shaft.

[0006]

[Action]

 In the above-mentioned anti-vibration bearing device, the rotation of the drive shaft is transmitted to the driven shaft by the meshing rotation of the gears.At that time, the meshing of the gears is caused by torque fluctuations of input / output and backlash of the gears. Vibration occurs. However, since the vibration is absorbed by the vibration isolator and is not transmitted to the gear case, noise does not occur. Moreover, even in the above vibration, the relative positional relationship between the drive shaft and the driven shaft is maintained at high rigidity by the bearing block.

[0007]

【Example】

 An anti-vibration bearing device according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2, shaft holes 4 and 5 in which a drive shaft 2 and a driven shaft 3 are respectively fitted and inserted are formed in parallel in a gear case 1 of a gear mechanism such as a transmission. The driven shaft 3 projects into the hollow portion of the gear case 1 from the shaft holes 4 and 5. Gears 6 and 7 are fixed to the projecting ends of the drive shaft 2 and the driven shaft 3, respectively, and the gears 6 and 7 are meshed with each other.

On the wall surface of the hollow portion of the gear case 1, there are an oval-shaped concave portion 8 that covers the openings of the shaft holes 4 and 5, that is, concentric semicircular portions that surround the shaft holes 4 and 5 and a rectangular portion between them. Since the oval concave portion 8 composed of is formed, the shaft holes 4 and 5 are open to the oval concave portion 8.

An oval bearing block 10 is fitted in the oval recess 8 through a vibration damping material 9 (for example, synthetic resin such as nylon) having low rigidity but high damping property. That is, in the oval concave portion 8, a vibration isolator 9 having an L-shaped cross section and having an oval shape is fitted in contact with the inner peripheral surface of the oval concave portion 8 and the bottom surface adjacent thereto, and the vibration isolator 9 is further attached. The bearing block 10 is fitted on the inner surface of the. The bearing block 10 is provided with stepped holes 11 and 12 coaxially with the driving shaft 2 and the driven shaft 3 in the proper meshing state of the gears 6 and 7, and the stepped holes 11 and 12 are Rolling bearings 13 and 14 are fitted in contact with the step portion. The drive shaft 2 and the driven shaft 3 are rotatably supported by the rolling bearings 13 and 14, respectively.

The rotation of the drive shaft 2 is transmitted to the driven shaft 3 by the meshing rotation between the gear 6 and the gear 7. At that time, the gear 6 and the gear 6 are rotated due to torque fluctuations of input / output and backlash of the gear. The meshing vibration with 7 occurs. However, since the vibration is absorbed by the vibration isolator 9 and is not transmitted to the gear case 1, no noise is generated. Moreover, even in the above vibration, the relative positional relationship between the drive shaft 2 and the driven shaft 3 is maintained with high rigidity by the bearing block 10.

[0011]

[Effect of the device]

 According to the anti-vibration bearing device according to the present invention, the rotation of the drive shaft is transmitted to the driven shaft by the meshing rotation of the gears, and at that time, the meshing of the gears is caused by the fluctuation of input / output torque and the backlash of the gears. Vibration occurs. However, since the vibration is absorbed by the vibration isolator and is not transmitted to the gear case, no noise is generated.

Further, even in the above-mentioned vibration, the relative positional relationship between the drive shaft and the driven shaft is maintained at high rigidity by the bearing block, so that the meshing accuracy of the gears does not decrease. Therefore, there is no increase in the starting force. It also contributes to noise control.

[Brief description of drawings]

FIG. 1 is a sectional view of an anti-vibration bearing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the vibration-proof bearing device taken along line II-II in FIG.

FIG. 3 is a sectional view of a bearing device according to a conventional technique.

FIG. 4 is a sectional view of an anti-vibration bearing device according to a conventional technique.

5 is a cross-sectional view of the vibration-proof bearing device taken along the line VV in FIG.

[Explanation of symbols]

 1 Gear Case 2 Drive Shaft 3 Driven Shaft 4 and 5 Shaft Holes 6 and 7 Gear 8 Oval Recess 9 Vibration Isolator 10 Bearing Blocks 11 and 12 Stepped Holes 13 and 14 Rolling Bearings

Claims (1)

[Scope of utility model registration request] 1. A gear mechanism in which a gear fixed to a drive shaft and a driven shaft fitted in a shaft hole formed parallel to the gear case meshes with each other, although the gear case has low rigidity.
The bearing block is fitted through a high damping material,
An anti-vibration bearing device in which bearings that support the drive shaft and the driven shaft are fixed to the bearing block while maintaining a coaxial relationship with the drive shaft and the driven shaft when the gears are properly meshed.