JPH0715913A - Motor fitted with worm reduction gear - Google Patents

Abstract

PURPOSE:To enable a worm to be designed without being influenced by the diameter of a motor shaft by forming an engaging part to engage with the end of the motor shaft, integrally at the end of a reduction gear, and forming a worm at the position different from the engaging part with the motor shaft. CONSTITUTION:The cylindrical tip 24b of the motor shaft 24 is press-fitted in the engaging recess 34 being made integrally at the end on middle bearing 32 side of a speed reduction shaft. This engagement position is within the range D of the middle bearing 32 of the speed reduction shaft, being different from the range E of a worm 31. Hereby, the diameter G of the tooth bottom 31a of the worm 31 can be designed regardless of the diameter F of the motor shaft 24. Moreover, the axis of the speed reduction shaft can be maintained easily at rotation by forming a top bearing 33 and a middle bearing 32 integrally at both ends in axial direction of the worm 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a worm speed reduction mechanism, for example, a power window of a vehicle,
The present invention relates to a motor with a worm speed reducer used for a sunroof, a power seat, and the like.

[0002]

2. Description of the Related Art Conventionally, there is an armature 50 for a motor with a worm speed reducer as shown in FIG. This armature 50
Is the commutator 52, the winding core 53, and the motor shaft 5 inserted and fixed in the commutator 52 and the winding core 53.
It is composed of 1. The tip bearing portion 5 is rotatably supported by a bearing (not shown) on the motor shaft 51.
1a, an intermediate bearing portion 51b, and a rear end bearing portion 51c are provided, and the leading end bearing portion 51a and the intermediate bearing portion 51b are provided.
A worm 54 is formed between and. The worm 54 is formed integrally with the motor shaft 51 by rolling a part of the motor shaft 51.

There is also an armature 60 as shown in FIG. In this armature 60, an intermediate bearing portion 65, which is rotatably supported by a bearing 66, is press-fitted and fixed to a motor shaft 61 that is inserted and fixed in a commutator 62 and a winding core 63,
Further, the worm 64, which is a separate member, is press-fitted and fixed to the motor shaft 61.

There is also an armature 70 as shown in FIG. This armature 70 has a motor shaft 71 fixed to a commutator 72 and a winding core 73.
The bearing 76 for rotatably supporting the intermediate portion of the above is fitted and the worm 74 of another member is press-fitted and fixed to the motor shaft 71,
It is composed.

[0005]

[Problems to be Solved by the Invention]

According to the above conventional example, first, the armature 50.
Since a part of the motor shaft 51 is formed as the worm 54, the diameter of the worm 54 becomes substantially equal to or smaller than the diameter of the motor shaft 51, and the worm design specification is limited by the diameter of the motor shaft 51. .

Further, in the armature 60, the intermediate bearing portion 65 and the worm 64, which are separate members, are press-fitted and fixed to the motor shaft 61. Vibration occurs due to misalignment of the shaft during rotation of 60, which causes gear meshing noise and armature vibration noise.

Further, in the armature 70, the bearing 76 is fitted into the motor shaft 71 and the worm 74 is press-fitted and fixed. Therefore, when the armature 70 is housed in a motor case (not shown), the bearing 76 is in the thrust direction of the motor shaft 71. It moves freely, making storage work extremely difficult.

Further, the armature 60 (70) has a worm 64 (74) on a motor shaft 61 (71) as shown in FIG.
Is press-fitted and fixed. As a result, a predetermined (1 mm to 2 mm) wall thickness A is required for press-fitting and holding. Here, the wall thickness A means the through hole 64a (74) of the worm 64 (74).
It is the distance between the peripheral surface of a) and the tooth bottom portion 64b (74b).
Therefore, as the diameter of the motor shaft 61 (71) increases, the diameter B of the tooth bottom portion 64b (74b) also increases, and the diameter C of the tooth top portion 64c (74c) also increases.
That is, the worm design specification is limited by the diameter of the motor shaft 61 (71).

An object of the present invention is to provide a worm gear reducer motor in which the shaft center of the worm and the bearing can be easily taken and the worm can be designed without being influenced by the diameter of the motor shaft.

[0011]

In order to solve the above-mentioned problems, a worm gear reducer motor according to the present invention is a worm gear reducer motor that decelerates the rotation of a motor shaft through a worm and a worm wheel and outputs the result. The outer periphery at a position different from the fitting portion in the thrust direction of the reduction shaft, the fitting portion fixedly fitted to the end portion of the motor shaft has a reduction shaft integrally formed at the end portion in the thrust direction. This is a motor with a worm reducer in which a worm is formed.

[0012]

In the worm gear reducer motor according to the present invention, by forming the worm on the outer periphery of the reduction shaft at a position different from the fitting portion for fitting and fixing with the motor shaft, the end portion of the motor shaft is made to have the worm. It will not be inserted through the axis center of. As a result, the influence of the motor shaft on the worm is eliminated only by matching the fitting portion of the reduction shaft with the shape of the end portion of the motor shaft.

[0013]

As described above, according to the present invention, the worm can be designed without being influenced by the diameter of the motor shaft, and the shaft center between the worm and the bearing can be easily obtained.

[0014]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows the main part of the motor 10 with a worm gear reducer in this embodiment. According to this, the worm gear reducer motor 10 includes the motor shaft portion 20, the reduction shaft portion 30,
And a reduction gear unit 40.

The motor bearing portion 20 includes a commutator 21,
The core 23 has a winding wire 23 wound around it, and a commutator 21 and a motor shaft 24 that are inserted and fixed to the respective shaft centers of the core iron 22 and rotate together with the commutator 21 and the core iron 22. The rear end bearing portion 24 a of the motor shaft 24 is rotatably supported by the rear end bearing 53.

The reduction shaft portion 30 is constructed by integrally forming a worm 31, an intermediate bearing portion 32, and a tip bearing portion 33. The reduction shaft portion 30 has an intermediate bearing portion 32 and a front end bearing portion 33 rotatably supported by an intermediate bearing 52 and a rear end bearing 53, respectively.

The reduction gear unit 40 is composed of a worm wheel 41 having gear teeth 41a meshing with the worm 31 formed on its outer peripheral surface and rotatably supported by a rotary shaft 42.

Assembling of the motor shaft portion 20 and the reduction shaft portion 30 constituting the armature 15 will be described with reference to FIGS. A fitting concave portion 34 is formed at an end of the reduction shaft portion 30 on the side of the intermediate bearing portion 32, and a cylindrical tip fitting portion 24 of the motor shaft 24 of the motor shaft portion 20 is formed in the fitting concave portion 34.
b is press-fitted and fixed by the arrow in FIG. At this time, the fitting position between the tip fitting portion 24b of the rotary shaft 20 and the reduction shaft 30 is
Range D of the intermediate bearing portion 32 in the axial direction of the reduction shaft portion 30
And is located at a position different from the range E of the worm 31.

By setting the fitting position as described above, the diameter G of the tooth bottom portion 31a of the worm 31 is equal to the diameter F of the motor shaft 24.
It can be designed regardless of That is, in the conventional example shown in FIGS. 6 to 8, it cannot be manufactured unless the diameter of the tooth bottom portion 64b (74b) of the worms 64, 74 is made larger than the diameter of the motor shafts 61, 71, and in the conventional example shown in FIG. The diameter of the tooth bottom portion 54a of the worm 54 cannot be made larger than the diameter of the motor shaft 51, but in the present embodiment, the diameter G of the tooth bottom portion 31a of the worm 31 can be made larger or smaller than the diameter F of the motor shaft 24. . Further, the tip bearing portion 33 is not determined by the diameter F of the motor shaft and can be freely changed.

The motor shaft 24 is shown in FIGS. 4 (a) to 4 (c).
7 shows another structure of the tip fitting portion 24b in FIG. Figure 4
(A) is a structure in which the tip end of the motor shaft 24 is a knurled tip fitting portion 24 c, and it can be firmly press-fitted and fixed in the fitting recess 34 of the reduction shaft portion 30. Figure 4 (b) shows
Tip fitting part 24d obtained by cutting the tip of the motor shaft 24 on the D surface
4 (c) shows a tip polygonal (hexagonal) tip fitting portion 24e of the motor shaft 24. Both shapes eliminate slippage during rotation between the motor shaft 24 and the fitting recess 34, The rotation of the motor shaft portion 20 can be reliably transmitted to the reduction shaft portion 30. However, when the tip fitting portion has a D-plane cut and a polygonal shape, the fitting recess 34 of the reduction shaft portion 30 needs to have a shape that matches the shape of the tip fitting portion.

The deceleration shaft portion 30 is formed by integrally molding a tip bearing portion 33 and an intermediate bearing portion 32 on both sides of the worm 31 in the axial direction to form one component. As a result, the axes of the intermediate bearing 52, the worm 31, and the tip bearing 51 can be easily maintained during rotation of the armature 15, and vibration and noise can be reduced.

Further, by forming the motor shaft portion 20 and the reduction shaft portion 30 as separate parts, the reduction shaft portion 30 having various sizes and shapes can be assembled to the same motor shaft portion 20, or conversely, various kinds. By assembling the same deceleration shaft portion 30 to the specified motor shaft portion 20, it is possible to produce a multi-model armature 15.

Further, in the present embodiment, the fitting recess 34 is formed in the reduction shaft portion 30 and the tip fitting portion 24b of the motor shaft 24 is fitted in the fitting recess 34. A fitting recess may be formed at the tip of 24, and the end of the reduction shaft portion 30 on the side of the intermediate bearing 32 may be fitted into the fitting recess.

[Brief description of drawings]

FIG. 1 is a configuration diagram of main parts of a motor with a worm speed reducer according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the armature assembly in the embodiment of the present invention.

FIG. 3 is an enlarged view of a main part after the armature is assembled in the embodiment of the present invention.

FIG. 4 is another example of the motor shaft tip fitting portion in the embodiment of the present invention, in which (a) is a knurled shape,
(B) shows a D-plane cut shape, and (c) shows a polygonal shape.

FIG. 5 is an overall view showing a conventional armature.

FIG. 6 is an overall view showing another conventional armature.

FIG. 7 is an overall view showing still another conventional armature.

FIG. 8 is an enlarged view of the waist of the conventional armature shown in FIGS. 6 and 7 after assembling.

[Explanation of symbols]

 10 Motor with Worm Reducer 24 Motor Shaft 24b Tip Fitting Section 30 Reduction Shaft Section 31 Worm 32 Intermediate Bearing Section 34 Fitting Recess 41 41 Worm Wheel

Claims (1)

[Claims] 1. In a worm gear reducer motor for decelerating the rotation of a motor shaft via a worm and a worm wheel, the fitting portion fixedly fitted to the end portion of the motor shaft has a thrust direction end portion. A worm gear reducer motor having a reduction shaft integrally formed with a worm, wherein a worm is formed on an outer periphery of a position different from the fitting portion in the thrust direction of the reduction shaft.