JPH0739272U - Motor output shaft support structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an output shaft support structure of a motor that can be easily assembled. [Structure] The worm wheel 11, the damper 14, and the gear case 13 are sandwiched between the flange surface 15a of the output plate 15 and the push nut 16 mounted on the output shaft portion 15c, whereby movement of the worm wheel 11 in the axial direction can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an output shaft support structure for a motor having a worm gear.

[0002]

[Prior art]

 In recent years, efforts have been made to reduce the number of parts for motors, reduce the number of parts, and reduce the processing and assembly processes.

A conventional motor output shaft support structure will be described below with reference to FIG.

As shown in the drawing, the rotational torque is transmitted from the worm wheel 2 that meshes with the worm 1 arranged on the armature shaft to the torque transmission plate 4 via the damper 3. The output shaft 5 has a shaft portion 5a which is inserted into a hole of the gear case 6 and engages with the torque transmission plate 4, and a head portion 5b having an outer diameter larger than that of the shaft portion 5a is exposed from the gear case 6 and engages with a counterpart device. Then, the rotation torque of the motor is transmitted.

In order to fix the worm wheel 2, the damper 3, the torque transmission plate 4, and the output shaft 5 arranged in the gear case 6 in the axial direction, a groove is formed in the shaft portion 5 a of the output shaft 5. A retaining ring 7 is fitted to support the output shaft.

[0006]

[Problems to be solved by the device]

 The conventional output shaft support structure for such a motor has a large number of parts and requires groove processing for fitting the retaining ring, which causes a problem of high cost.

The present invention solves the above problems, and an object of the present invention is to provide an output shaft support structure for a motor that can be easily assembled even when the number of parts and processing are reduced.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a torque transmission plate that engages with a worm wheel directly or through a damper and receives a rotational torque, and an output plate that integrates an output shaft that engages with the torque transmission plate. A push nut is installed on the output shaft of the output plate that protrudes from the hole of the gear case.

[0009]

[Action]

 The present invention is capable of supporting the output shaft easily without groove processing by reducing the number of parts by the above-mentioned configuration.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, the worm wheel 11 meshes with the worm 12 and has an inner diameter supported by a boss 13a of a gear case 13 so as to be rotatable. The position of is fixed. Further, a plurality of ribs 11a are arranged radially from the inner diameter and engage with the slits 14b of the damper 14. The damper 14 is provided with a plurality of holes 14a on the surface opposite to the surface on which the slits 14b are provided, and is arranged in the vicinity of the outer circumference of the flange surface 15a facing the worm wheel 11 and the damper 14 of the output plate 15. A plurality of protrusions 15b are engaged. A part of the output shaft portion 15c protruding from the shaft center portion of the flange surface 15a is exposed to the outside of the motor through a hole in the boss 13a of the gear case 13, and the push nut 16 is mounted on the exposed portion.

To explain the operation in the above configuration, the rotational torque transmitted to the worm wheel 11 via the worm 12 is applied to the damper 14 engaged with the rib 11a, and further with the hole 14a of the damper 14. It is transmitted to the output plate 15 which is operating. Since the worm wheel 11 is a helical gear, a load is generated in the axial direction when transmitting the rotational torque. However, even when an axial load in a direction away from the gear case 13 is generated, the meshing position with the worm 12 is displaced. The push nut 16 is attached to the output shaft portion 15c of the output plate 15 so that the worm wheel 11, the damper 14, and the gear case 13 are sandwiched between the output nut 15 and the flange surface 15a of the output plate 15. To prevent the movement of.

As described above, according to the output shaft supporting structure of the motor of the embodiment of the present invention, the push nut 16 is attached to the output shaft portion 15c of the output plate 15 exposed to the outside of the motor through the hole in the boss 13a of the gear case 13. The axial movement of the worm wheel 11 can be prevented only by mounting the worm wheel 11, and the output shaft can be easily supported without grooving the output shaft portion 15c.

The damper 14 may have a structure in which the worm wheel 12 and the output plate 15 are directly engaged with each other if it is not functionally necessary.

[0015]

[Effect of device]

 As is apparent from the above-described embodiments, according to the present invention, the flange surface that receives the rotating torque from the worm wheel via the damper or directly, and the shaft surface that protrudes from the gear case partly protrudes from the hole. An output plate that integrates the output shaft is provided, and a push nut is attached to this output shaft to sandwich the worm wheel, gear case, and damper to prevent axial movement of the worm wheel. It is possible to easily assemble without the need for grooving and to provide an inexpensive motor output shaft support structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing an output shaft support structure of a motor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of main components of a motor output shaft support structure according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional output shaft support structure of a motor.

[Explanation of symbols]

 11 Worm Wheel 12 Worm 13 Gear Case 14 Damper 15 Output Plate 15a Flange Surface 15b Protrusion 15c Output Shaft 16 Push Nut

Claims (1)

[Scope of utility model registration request] 1. A worm wheel for transmitting a rotating torque generated in an armature through a worm arranged at a tip of an armature shaft, a worm wheel arranged coaxially with the worm wheel, and directly or from the worm wheel. An output plate having an output shaft portion projecting from the shaft core portion of the flange surface that receives the rotational torque via the damper, and a gear case that accommodates the components, and the output shaft portion of the output plate exposed from the hole of the gear case. A motor output shaft support structure that is equipped with a push nut.