JPH06269145A - Motor having worm reduction mechanism - Google Patents

Abstract

PURPOSE:To decrease the number of components and to simplify an automated assembly line when the components such as a worm wheel, an output shaft and an intermediate wheel are assembled into the body of a case, wherein the rear-surface is opened. CONSTITUTION:An intermediate wheel 7 is provided at an output shaft 6 as a unitary body under the state, wherein the diameter of the wheel becomes larger than the diameter of the output shaft 6. The output shaft 6 is constituted so that the output shaft 6 can be assembled into a case body 4 through an opening together with the intermediate wheel 7. Meanwhile, the intermediate wheel 7 is supported with the case main body 4 and a bottom cover 10 in this constitution, and the motor having a worm reduction mechanism is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with a worm speed reduction mechanism, which is used as a drive source for electric components mounted on a vehicle, for example.

[0002]

BACKGROUND OF THE INVENTION Generally,
Among such motors with a worm speed reduction mechanism, a worm gear on the motor shaft side, a worm wheel meshing with the worm gear, an output shaft, and an output shaft are integrally formed in a speed reduction mechanism chamber formed so that the back side is opened with respect to the case body. The intermediate wheel that is provided in a special manner, and the cushioning body having rubber elasticity interposed between the worm wheel and the intermediate wheel are installed inside, and then the opening is closed by the bottom cover to be assembled. is there.

And as such a thing, the actual development sho 62-
The one shown in Japanese Patent No. 82457 is conventionally known. By the way, although this is a worm wheel, which is rotatably supported by the case body, the output shaft is rotatably supported by the case body through a bearing, and the intermediate wheel is connected to the output shaft by a connecting member. It was fastened in a detent form using. As a result, special parts such as bearings are required, and the number of parts is large, which complicates the assembly work.
Since the output shaft is built into the case body from the front side, it cannot be installed from the opening side where the worm wheel and the intermediate wheel are installed. Therefore, we tried to install these parts on an automated line. In this case, the line must be designed so that it can be installed from both the front and back sides, and there is a problem that the line becomes complicated and inevitably becomes large.

[0004]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a motor with a worm speed reduction mechanism capable of eliminating these drawbacks in view of the above circumstances, and the back side is A case main body that forms an open reduction gear mechanism chamber, a worm gear on the motor shaft side provided on the inner peripheral portion of the reduction gear mechanism chamber, and a rotatably rotatably supported by the case main body that meshes with the worm gear. Worm wheel, an output shaft projecting outside from a through hole formed on the surface of the case body, an intermediate wheel integrally provided on the output shaft, and the worm wheel and the intermediate wheel. In a motor with a worm speed reduction mechanism including a cushioning body having rubber elasticity and a bottom cover that covers the opening of the reduction mechanism chamber, the output shaft is Assuming that the intermediate wheel has a large diameter, the output shaft and the intermediate wheel are configured to be incorporated into the reduction mechanism chamber together with the intermediate wheel. It is characterized in that a rotatably supported shaft supporting portion and a support portion slidably abuttingly supported by a support receiving surface formed on the inner surface of the bottom cover are formed.

With this structure, the present invention eliminates the connection between the output shaft and the intermediate wheel, and allows the output shaft to be assembled from the opening side closed by the bottom cover. is there.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a motor for electrical equipment mounted on a vehicle, and the motor 1 is composed of a motor section 2 and a worm speed reduction mechanism chamber section 3. Reference numeral 4 denotes a resin case main body that constitutes the worm speed reduction mechanism chamber portion 3 and has an opening on the back side. The case main body 4 has a motor shaft 2a protruding from the motor portion 2. Worm gear 2b formed integrally with the shaft 2a
, Meshes with a wheel gear 5b formed in an outer cylinder portion 5a of a worm wheel 5 which is rotatably supported by the case body 4. That is, a through hole 4a through which an output shaft 6 described later penetrates is formed on the front surface side of the case main body 4, and the periphery of the through hole 4a is concentric with the shaft center of the output shaft 6. Thus, the boss cylinder portion 4b protruding toward the rear surface side of the case body 4 and the support receiving surface 4c located on the outer peripheral side of the boss cylinder portion 4b are integrally formed. In the worm wheel 5, the boss portion 5c is rotatably supported by the outer cylindrical surface 4d of the boss cylindrical portion 4b, and the contact surface 5d formed on the front surface side of the wheel is in surface contact with the support receiving surface 4c. It is slidably supported, and further, the inner peripheral surface 5 of the outer tubular portion 5a is
e is the outer peripheral surface 7e of the intermediate wheel flange portion 7c described later.
The worm wheel 5 is set so that it can be slidably contacted with the worm wheel 5 on three sides.

On the other hand, 6 is an output shaft, and a pinion gear 6a for transmitting power to the actuated side is engraved at the tip of the output shaft 6, and the outer periphery of the output shaft 6 at the base end side. A key groove portion 6b is engraved on the. The output shaft 6 is integrally provided with a resin-made intermediate wheel 7 having a diameter larger than that of the output shaft 6 so as to cover the key groove portion 6b by molding. The output shaft 6 and the intermediate wheel 7 are incorporated into the case body 4 through the opening on the rear surface side so that the output shaft 6 projects from the through hole 4a to the outside of the worm speed reduction mechanism chamber 3. At this time, in the intermediate wheel 7, the boss portion 7a formed on the outer peripheral surface thereof has the inner cylindrical surface 4 of the boss cylindrical portion 4b formed on the peripheral portion of the through hole 4a.
It is configured to be rotatably fitted in and supported by e. still,
The retaining of the intermediate wheel 7 on the front side in the axial direction is performed by using the positioning portion 5g of the inner peripheral surface 5e of the worm wheel 5 and the intermediate wheel 7
The shoulder portion 7h of the outer peripheral surface 7e is locked. Further, the intermediate wheel 7 is formed with a flange portion 7c so as to be opposed to the wheel back surface of the worm wheel 5 with a gap therebetween, and a peripheral surface is provided at an opposing surface portion of the flange portion 7c and the worm wheel 5. Locking sides 7d and 5f which are in a state of being in conflict with each other are formed with a predetermined gap in the circumferential direction.
A buffer body 9 having rubber elasticity is interposed between d and 5f.

Reference numeral 10 denotes a bottom cover, which serves as a lid for the opening formed in the case body 4. The bottom cover 10 has an inner surface on which the axis of the output shaft 6 is provided. Concentric first and second support receiving surfaces 10a,
10b is formed so as to be convex inward. The first support receiving surface 10a slidably contacts the contact surface 7f formed on the back surface of the intermediate wheel flange portion 7c in a surface contact state, and the second support receiving surface 10b.
Is slidably fitted in a concave portion 7g formed in the center of the intermediate wheel 7 in a surface contact state. Therefore, the intermediate wheel 7 supports the two surfaces and the inner cylindrical surface 4e of the boss cylindrical portion 4e. It is configured to be supported on three sides by and. Reference numeral 11 is a gasket interposed between the bottom cover 10 and the case body 4.

In the embodiment of the present invention constructed as described above, the worm wheel 5, the output shaft 6, the intermediate wheel 7, the shock absorber 9, etc. are incorporated in the case body of the worm speed reduction mechanism chamber 3. However, in this case, since the output shaft 6 is integrally provided by the mold formation in the state where the intermediate wheel 7 has a larger diameter than the output shaft 6, the intermediate wheel 7 and the output shaft 6 are Therefore, the output shaft 6 can be assembled together with the intermediate wheel 7 into the case body 4 through the opening on the rear surface side. Moreover, since the intermediate wheel 7 has a structure in which three surfaces are supported by the boss inner cylindrical surface 4e of the case body 4 and the first and second support receiving surfaces 10a and 10b of the bottom cover 10, Unlike the conventional case, it is not necessary to support the case body 4 via a dedicated bearing. As a result, the connecting member and the bearing can be omitted, and the number of parts can be reduced and the number of assembling steps can be reduced accordingly. Furthermore, since the output shaft 6 can be assembled together with the intermediate wheel 7 from the opening side of the case body 4, almost all the parts can be incorporated into the case body 4 from the back side of the case body 4.
Simplification of the automation line can be achieved, which will greatly contribute to cost reduction.

It should be noted that the present invention is not limited to the above embodiment, and in the embodiment, the intermediate wheel 7 has the three-sided support structure as described above, but the bottom cover 1
Of the first and second support receiving surfaces 10a and 10b of 0, one having no second support receiving surface as the support by only the first support receiving surface 10a as in the second embodiment shown in FIG. Alternatively, the support receiving structure may be reversed, and even in such a case, there is no support for stable support of the intermediate wheel 7, but the three-sided support structure as in the above-described embodiment has a more reliable stable support. Will be done.

[0011]

In summary, since the present invention is constructed as described above, various components such as a worm gear, a worm wheel, an output shaft, an intermediate wheel, and a shock absorber are incorporated in the case body of the reduction mechanism room. However, in this case, the intermediate wheel and the output shaft are integrally provided on the output shaft by the mold formation in a state where the diameter is larger than that of the output shaft. It is not necessary to use a separate connecting member to connect the output shaft and the output shaft together with the intermediate wheel to the case body through the opening on the rear surface side. Moreover, in the intermediate wheel, the shaft supporting portion is supported by the inner peripheral surface of the through hole of the case body, and the supporting portion is supported by the support receiving surface of the bottom cover. There is no need to support the case body via a dedicated bearing. As a result, the connecting member and the bearing can be omitted, and the number of parts can be reduced and the number of assembling steps can be reduced accordingly. Furthermore, since the output shaft can be assembled with the intermediate wheel from the opening on the back side of the case body,
Almost all the parts can be incorporated into the case body from the back side of the case body, which simplifies the automation line and greatly contributes to cost reduction.

[Brief description of drawings]

FIG. 1 is a partial horizontal sectional plan view of a motor.

FIG. 2 is a vertical cross-sectional view of a worm speed reduction mechanism chamber portion.

FIG. 3 is a plan view of a worm wheel.

FIG. 4 is a vertical sectional view of the same.

FIG. 5 is a bottom view of the same.

FIG. 6 is a plan view of an intermediate wheel.

FIG. 7 is a vertical sectional view of the same.

FIG. 8 is a bottom view of the same.

FIG. 9 is a vertical cross-sectional view of a worm speed reduction mechanism chamber portion in a second embodiment.

[Explanation of symbols]

 2b Worm gear 3 Worm speed reduction mechanism chamber section 4 Case body 4a Through hole 4e Inner cylinder surface 5 Worm wheel 6 Output shaft 7 Intermediate wheel 7a Boss section 7f Contact surface 7g Recessed section 9 Buffer 10 Bottom cover 10a First support receiving surface 10b Second support receiving surface

Claims (1)

[Claims] 1. A case main body which forms a reduction gear mechanism chamber having an opening on the back side, a worm gear on the motor shaft side which is arranged on an inner peripheral portion of the reduction gear mechanism chamber, and which meshes with the worm gear,
Also, a worm wheel rotatably supported by the case body, an output shaft projecting to the outside from a through hole formed on the surface side of the case body, an intermediate wheel integrally provided on the output shaft, and a worm. In a motor with a worm speed reduction mechanism configured by including a cushioning body having rubber elasticity interposed between the wheel and the intermediate wheel, and a bottom cover that covers the speed reduction mechanism chamber opening, the output shaft includes: Assuming that the intermediate wheel is formed in a state of having a diameter larger than that of the output shaft, the output shaft and the intermediate wheel are configured to be incorporated into the speed reduction mechanism chamber through the opening, while the intermediate wheel has the inside of the through hole. A shaft supporting portion rotatably supported on the peripheral surface and a support portion slidably abuttingly supported by a support receiving surface formed on the inner surface of the bottom cover are formed. Over-time motor with reduction gear mechanism.