JP2001254784A - Hypoid gear type speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a gear noise and a resonance with a set for fitting a speed reducer by reducing the engagement vibration between a pinion and a hypoid gear. SOLUTION: An elastic member 11 is arranged in a clearance formed between the bottom face of a storage part 8a for storing a ball bearing 6b in a gear insertion side and the side face of the ball bearing 6b in two ball bearing 6a and 6b supporting a spindle 5 for the speed reducer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a speed reducer using a hypoid gear.

[0002]

2. Description of the Related Art There are various types of speed reduction mechanisms. Among them, a hypoid type speed reduction mechanism has vibration, noise, and noise reduction compared with a speed reduction mechanism using a bevel gear having a similar structure. Excellent in terms of gear rigidity.

A conventional motor provided with a hypoid type speed reducer will be described with reference to FIG. FIG. 2 is a side sectional view of a conventional motor with a hypoid type reduction gear.

[0004] In FIG. 2, a motor 15 with a hypoid type speed reducer comprises an electric motor 16 and a speed reducer 18 engaged with a pinion 17 extending from the motor 16.

The electric motor 16 includes a stator 19 having a cylindrical core 37 around which a winding 36 is wound, a cylindrical frame 20 pressed into the outer peripheral surface of the stator 19, A rotor 21 housed in the inner peripheral surface, two ball bearings 22a and 22b that support the rotor 21 and are rotatable, and housing portions 23a and 2 that house these ball bearings 22a and 22b.
4a, and two bearing brackets 23 and 24 attached to both openings of the frame 20.

The rotor 21 comprises a shaft 25 and a permanent magnet 26 held on the outer peripheral surface of the shaft 25. A pinion 17 is formed at one end of the shaft 25. A hypoid gear described below is meshed with the pinion 17. Ball bearings 22a, 22b
Are press-fitted to both ends of the shaft 25, respectively.

The storage part 23a of the bearing bracket 23
Between the bottom surface of the ball bearing 22a and the side portion of the ball bearing 22a in contact with these bottom surfaces, one or more shim washers 27 are provided.
Is inserted. That is, an arbitrary number of shim washers 27 are inserted into the accommodating portions 23a of the ball bearings 22a that support the shaft 25 on the pinion 17 side, thereby adjusting the position of the pinion 17 in the thrust direction. By adjusting the position of the pinion 17,
The backlash between the pinion 17 and the hypoid gear meshed with the pinion 17 can be managed.

The end play of the rotor 21 can be managed by inserting an arbitrary number of the shim washers 28 into the accommodating portion 24a of the ball bearing 22b supporting the shaft 25 on the side opposite to the pinion 25.

[0009] Of the two bearing brackets 23, 24, one of the bearing brackets 23 has a reduction gear 18 attached thereto.
Is formed, and the pinion 17 of the shaft 25 is provided so as to protrude from the bearing bracket 23.

The reduction gear 18 includes a hypoid gear 30 meshed with the pinion 17, a spindle 29 mounted through the center of the hypoid gear 30, and two ball bearings 31a rotatably supporting the spindle 29.
31b, and two-piece casings 32, 33 having storage portions 32a, 33a for storing the ball bearings 31a, 31b.

The speed reducer 29, the bearing bracket 23
The pinion 17 is inserted into the inside of the speed reducer 29 and meshes with the hypoid gear 30.

Further, the storage portions 32 of the casings 32, 33
The gap between the bottom surface of each of the a and 33a and the side surface of the ball bearings 31a and 31b in contact with this bottom surface is
Similarly, one or a plurality of shim washers are inserted, and the protrusion length of the spindle 31 from the casing 32 is adjusted by the shim washer 34 inserted into one of the storage portions 32a. The end play of the spindle 31 is managed by the shim washer 35 inserted into the storage section 32b.

[0013]

SUMMARY OF THE INVENTION In a device using a hypoid type speed reducer constructed as described above, for example, in a speed reducer used for opening and closing an automatic door, rotation of the automatic door during opening and closing is described. When the direction was switched, resonance noise was generated due to meshing vibration between the pinion and the hypoid gear. That is, in a device such as an automatic door that repeatedly rotates forward and backward frequently, the resonance sound generated when the rotation direction is switched becomes unpleasant.

[0014]

According to the present invention, there are provided two casings forming a storage portion for storing a ball bearing, hypoid-type gear cutting, and meshing with a pinion. A hypoid gear, a spindle having at least two steps formed therein, a ball bearing being fitted in contact with one of the steps, the hypoid gear being fitted into the other step, and a ball bearing being fitted adjacent to the gear; A hypoid gear type reduction gear characterized in that an elastic member is disposed in a gap formed between a bottom surface of a storage portion for storing the ball bearing on the hypoid gear fitting side and a side surface of the ball bearing.

[0015]

[Function] A gap between a bottom surface of a storage portion for storing a ball bearing on a gear fitting side and a side surface of the ball bearing is provided together with a shim washer.
By inserting an elastic member such as a spring washer and applying a preload in a direction to reduce the amount of backlash, meshing vibration between the pinion and the hypoid gear is reduced. That is, the reaction force generated when the gear is suddenly reversed can be reduced by applying a preload.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described.
An electric motor provided with a hypoid type speed reducer will be described with reference to FIG. FIG. 1 is an enlarged sectional side view of a reduction gear section of a motor with a hypoid type reduction gear according to the present invention.

In FIG. 1, a speed reducer 1 is mounted on a flange surface 2a of a bearing bracket 2 of the motor, similarly to a conventional motor with a hypoid type speed reducer.
Further, inside the reduction gear 1, a hypoid gear 4 meshed with a pinion 3 extending from the electric motor, and a spindle 5 mounted through a central portion of the hypoid gear 4.
And two ball bearings 6a and 6b for rotatably supporting the spindle 5, and casings 7 and 8 comprising two pieces having storage portions 7a and 8a for storing the ball bearings 6a and 6b. ing.

A gap is formed between the bottom surface of each of the housing portions 7 and 8 of the casing and the side surface of the ball bearing in contact with this bottom surface, and one or more shim washers 9 and 10 are inserted respectively. Have been. An elastic member such as a spring washer 11 is inserted into the housing portion 8 on the gear fitting side together with the shim washer 10.

By inserting the spring washer 11, a preload is applied in a direction to reduce the amount of backlash, and the meshing vibration between the pinion 3 and the hypoid gear 4 can be reduced.

Therefore, the reaction force generated when the rotation direction is suddenly reversed can be reduced because the preload is applied.

[0021]

According to the present invention, the gear noise and the resonance noise with the set to which the reducer is mounted can be reduced by reducing the meshing vibration between the pinion and the hypoid gear.

[0022]

[Brief description of the drawings]

FIG. 1 is an enlarged sectional side view of a speed reducer of a motor with a hypoid type speed reducer according to the present invention.

FIG. 2 is a side sectional view of a conventional motor with a hypoid type speed reducer.

[Explanation of symbols]

 1, 18 reduction gears 2, 23, 24 bearing brackets 3, 17 pinions 4, 30 hypoid gears 5, 29 spindles 6a, 6b, 22a, 22b, 31a, 31b ball bearings 7, 8, 32, 33 ... Casing 9, 10, 27, 28, 34, 35 ... Shim washer 11 ... Spring washer 15 ... Electric motor with hypoid type reduction gear 16 ... Electric motor 19 ... Stator 20 ... Frame 21 ... Rotor 25 ... Shaft 26 ... Permanent magnet

Claims (1)

[Claims] 1. A reduction gear using a hypoid gear, comprising: two casings forming a storage portion for storing a ball bearing; a hypoid gear which is provided with hypoid gear cutting and meshes with a pinion; A step is formed at two places, a ball bearing is fitted in contact with one of the steps, the hypoid gear is fitted into the other step, and a spindle is fitted with the ball bearing adjacent to the gear. A hypoid gear type reduction gear characterized in that an elastic member is disposed in a gap formed between a bottom surface of a storage portion for storing a ball bearing on a hypoid gear fitting side and a side surface of the ball bearing.