JP2003227527A - Joint and rotating electric appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized joint 2 which prevents idle running of an output shaft. <P>SOLUTION: A 2-faced parallel recess part 11 having a plane part 12 is provided at the output shaft 2. A joint 4 is provided with a pair of arc-state crimp walls 14 for crimping an outer diameter of the output shaft 2 and a 2-faced parallel projection part 13 connecting their centers in the circumferential direction. And the 2-faced parallel projection part 13 is pressed in the 2-faced parallel recess part 11. At that time, the arc-state crimp walls 14 give guidance so that the shaft center of the joint 4 aligns with the shaft center of the output shaft 2. As an engagement face 15 having a knurling tool is formed on the 2-faced parallel projection part 13, it is firmly crimped to the 2-faced parallel recess part 11. Thus, the output shaft 2 is rotated integrally with the joint 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting an output shaft and a driven shaft and a rotary electric machine having the joint fixed.

[0002]

2. Description of the Related Art Conventionally, a DC motor 91 as a rotary electric machine
When connecting to the driven device, as shown in FIG.
On one side, a spline engagement hole 93 formed to match the shape of the driven shaft 92 of the driven device, and to an engagement hole 9 formed to match the shape of the output shaft 94 of the DC motor 91 in the opposite direction.
A joint 96 having 5 was used.

More specifically, the joint 96 has a spline engaging hole 9 for a driven shaft 92 having a spline.
3 is formed so as to extend along the axial direction,
The driven shaft 92 is inserted and engaged in the spline engagement hole 93.

An engaging hole 95 for the output shaft 94 is provided in the opposite direction of the spline engaging hole 93 for the driven shaft 92.
Is adjusted to the shape of the output shaft 94 of the DC motor 91,
It is formed so as to extend along the axial direction, and the output shaft 94 is press-fitted into the engagement hole 95 thereof.

In this way, the output shaft 94 of the DC motor 91 is connected to the driven shaft 92 via the joint 96, and the motor torque of the output shaft 94 is transmitted to the driven shaft 92.

[0006]

However, the engaging hole 95 into which the output shaft 94 of the DC motor 91 is press-fitted is provided with the output shaft 94.
Since the output shaft 94 of the direct-current motor 91 is liable to idle, the motor torque of the output shaft 94 is not sufficiently transmitted to the driven shaft 92, because the output shaft 94 of the DC motor 91 is easily rotated.

Therefore, in order to reduce the idling of the output shaft 94, the circumferential length of the output shaft 94 needs to be formed large, and the output shaft diameter and the joint diameter are formed large.
There was a problem in reducing the size of the joint 96.

The present invention has been made to solve the above problems, and an object thereof is to provide a small-sized joint for preventing idling of the output shaft.

[0009]

In order to achieve the above object, the invention according to claim 1 is a joint for connecting an output shaft and a driven shaft, wherein a flat surface formed on the output shaft and parallel to the axial direction. With respect to the concave portion having, a convex portion having a flat surface that engages with the flat surface in a rotational direction, and a guide wall formed along the outer periphery of the output shaft are summarized.

The invention according to claim 2 is characterized in that the guide wall is formed so as to project from the convex portion. A third aspect of the present invention is characterized in that the convex portion is provided with a press-fitting portion that is press-fitted into the press-fitting hole formed in the concave portion of the output shaft.

According to a fourth aspect of the present invention, the guide wall is
The gist of the present invention is to provide a guide wall that is in pressure contact with the outer peripheral surface of the output shaft. A fifth aspect of the invention is summarized in that the guide wall includes a guide wall having an inner diameter slightly larger than an outer diameter of the output shaft.

A sixth aspect of the invention is characterized in that a knurl is formed on the engagement surface. The gist of the invention according to claim 7 is that the joint is formed of a sintered metal.

An eighth aspect of the present invention is summarized as a rotary electric machine in which the joint according to any one of the first to seventh aspects is connected to an output shaft. (Operation) According to the invention described in claim 1, in the joint connecting the output shaft and the driven shaft, with respect to the concave portion having a flat surface formed in the output shaft and parallel to the axial direction, Since the projection has a flat surface that engages with the output shaft and the crimping wall that is formed along the outer periphery of the output shaft and is in pressure contact with the outer peripheral surface, the joint and the output shaft rotate integrally, and the rotating electric machine It is possible to prevent the output shaft from idling.

According to the second aspect of the present invention, since the crimping wall is formed so as to project from the convex portion, it is possible to compensate for the decrease in strength of the output shaft due to the provision of the concave portion, and to increase the diameter of the output shaft. , Or there is no need to lengthen the output shaft. Therefore, the joint can be downsized.

According to the third aspect of the invention, when the joint and the output shaft are easily aligned with each other and rotate integrally,
The axis does not shift. According to the invention of claim 4,
When the joint and the output shaft are connected, the guide wall is in pressure contact with the output shaft, so that the shaft centers are easily aligned and the shaft centers are not easily displaced.

According to the fifth aspect of the invention, when the joint is connected to the output shaft, the guide wall serves as a guide, so that the output shaft can be easily connected to the joint.
According to the invention described in claim 6, since the knurling is engraved on the engaging surface, the allowable value of the deviation between the center of the crimping wall and the center of the convex portion increases, and the manufacturing of the joint becomes easy. Also,
The pressure bonding between the concave portion and the convex portion becomes reliable.

According to the seventh aspect of the invention, since the joint is made of sintered metal, it is not necessary to form the knurl by cutting, and the joint can be manufactured by shortening the manufacturing process. Therefore, the manufacturing cost can be reduced.

According to the invention described in claim 8, it is possible to provide a rotary electric machine which is drivingly connected to a joint which has a small shape and whose output shaft does not idle.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an output shaft 2 of a DC motor 1 as a rotary electric machine is drivingly connected to a driven shaft 3 of a driven device via a joint 4. The DC motor 1 includes a bottomed cylindrical yoke 5, a housing 6, and the yoke 5
An armature 7, a commutator 17, a brush device 18, and a magnet 19 are provided in the space surrounded by the housing 6. The armature 7 is provided with an output shaft 2, and the output shaft 2 is rotatably supported via bearings 8 and 9 provided on the yoke 5 and the housing 6, respectively.

One end of the output shaft 2 projects from the housing 6, and the joint 4 is press-fitted into the projecting portion. The driven shaft 3 of the driven device is inserted into and engaged with the joint 4 on the side opposite to the part where the output shaft 2 is connected.

Next, the tip of the output shaft 2 will be described. Figure 2
FIG. 3 is a perspective view of the tip of the output shaft 2 and the joint 4. At the tip of the output shaft 2, a two-surface parallel recessed portion 11 is formed in the axial direction. The two-surface parallel recessed portion 11 has a pair of flat surface portions 12 parallel to the axial direction of the output shaft 2, and the pair of flat surface portions 12 are formed equidistant from the axis of the output shaft 2.

Next, the joint 4 will be described. Figure 2
As shown in, the joint 4 is formed in a bottomed cylindrical shape and has a spline engagement hole 4b formed so as to extend along the axial direction.

The spline engagement hole 4b is formed in conformity with the outer shape of the driven shaft 3 having a spline, and the joint 4 and the driven shaft 3 engage in the rotational direction. Joint 4
Has a two-plane parallel convex portion 13 formed on the bottom portion 4a.
The two-plane parallel convex portion 13 is formed so as to extend along the central axis in a direction opposite to the spline engagement hole 4b for the driven shaft 3.

The two-plane parallel convex portions 13 are upper and lower side surfaces with respect to the axial direction, that is, the engaging surface 15 that abuts the flat surface portion 12 of the two-plane parallel concave portions 11 is parallel to the axial direction of the joint 4 and the axis of the joint 4. Formed equidistant from the heart.
Then, on the surfaces of both engagement surfaces 15, a plurality of knurls 16 (see FIG. 3) that are minute irregularities extending in the output shaft direction are formed.

The joint 4 is formed with a pair of arc-shaped crimping walls 14 as guide walls extending along the axial direction on the periphery of the bottom portion 4a. The two-plane parallel convex portion 13 is formed so as to connect the centers of the arc-shaped crimping walls 14 in the circumferential direction. That is, the pair of arc-shaped pressure-bonding walls 14 has the two-sided parallel convex portions 13
Are formed so as to extend in the circumferential direction at both ends in the radial direction.

The outer diameter of the arc-shaped crimping wall 14 matches the outer diameter of the joint 4, and the inner diameter is formed slightly smaller than the outer diameter of the output shaft 2 of the DC motor 1. And the arc-shaped crimping wall 14
The center of the inner peripheral surface of is formed so as to coincide with the axial center of the joint 4, and also coincides with the center of the two-plane parallel convex portion 13.
Further, the arc-shaped crimping wall 14 is formed so as to further project from the tip of the two-plane parallel convex portion 13.

The joint 4 is made of sintered metal. This eliminates the need for a cutting process for forming the knurls 16. Next, a method of connecting the output shaft 2 and the driven shaft 3 using the joint 4 will be described.

First, the two-surface parallel convex portion 13 of the joint 4 is press-fitted into the two-surface parallel concave portion 11 of the output shaft 2. At this time, the arc-shaped crimping wall 14 functions as a guide, so that the shaft centers of the output shaft 2 and the joint 4 coincide with each other. Further, the knurling 16 facilitates press-fitting of the two-sided parallel convex portion 13 into the two-sided parallel concave portion 11, and secures the pressure bonding between the two-sided parallel concave portion 11 and the two-sided parallel convex portion 13.

Next, the driven shaft 3 is inserted into and engaged with the joint 4 from the side opposite to the connecting portion of the output shaft 2 to connect the output shaft 2 of the DC motor 1 and the driven shaft 3 of the driven device. In this way, the DC motor 1 and the driven device are connected via the joint 4, whereby the output shaft 2 of the DC motor 1 and the joint 4 rotate integrally, and the driven device is connected via the joint 4. The motor torque is transmitted to the drive shaft 3.

As described in detail above, the first embodiment has the following features. (1) The two-sided parallel concave portion 11 and the two-sided parallel convex portion 13 each having a plane parallel to the axial direction of the output shaft 2 are pressure-bonded and fixed, and the movement of the joint 4 in the rotation direction of the output shaft 2 is restricted. Therefore, the motor torque of the output shaft 2 is applied to the joint 4
Therefore, the output shaft 2 of the DC motor 1 can be prevented from idling.

(2) By forming the center of the inner peripheral surface of the arc-shaped crimping wall 14 so as to coincide with the axial center of the joint 4, the arc-shaped crimping wall 14 serves as a guide, and the output shaft 2 and the joint 4 are provided. The axis centers of are the same. Therefore, the motor torque can be sufficiently transmitted to the driven device, and abnormal noise and vibration can be suppressed.

Further, it is not necessary to make a fine adjustment such that the joint 4 and the shaft center of the output shaft 2 coincide with each other, and the joint 4 and the output shaft 2 can be easily connected. (3) Since the arc-shaped crimping wall 14 is formed so as to project from the tip of the two-plane parallel convex portion 13, the motor torque from the output shaft 2 is reduced to 2
It can be received by the tips of the plane-parallel protrusions 13 and the arc-shaped crimping wall 14. Therefore, the motor torque can be received at different positions in the axial direction of the output shaft 2, and the two-surface parallel recessed portion 1 can be received.
The strength of the output shaft 2 due to the fact that 1 is formed on the output shaft 2 can be reinforced.

(4) Knurled 16 on the parallel projection 13 on the two surfaces
By forming the, the allowable value of the deviation between the center of the inner peripheral surface of the arc-shaped crimping wall and the center of the convex portion increases, so that the manufacturing cost can be reduced, and the two-surface parallel convex portion to the two-surface parallel concave portion 11 can be reduced. The press-fitting of 13 becomes easy.

Further, by forming the knurls 16, the two-sided parallel concave portion 11 and the two-sided parallel convex portion 13 are securely pressure-bonded, and the output shaft 2 does not fall out from the joint 4. (5) By manufacturing the joint 4 from sintered metal, it is not necessary to form knurls on the output shaft 2 and the joint 4 by cutting, and the manufacturing process can be shortened, so that the manufacturing cost can be reduced.

(6) Criminal fragrance of the two-sided parallel convex portion 13 A pair of arc-shaped crimping walls 14 are simply formed. Therefore, the arc-shaped crimping wall 1
4, the two-surface parallel convex portion 13 is reinforced, and the durability can be improved.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description and drawings thereof will be omitted.

A DC motor as a rotating electric machine has an output shaft 2a shown in FIG. The output shaft 2a is formed with a two-sided parallel concave portion 11, and the pair of flat surface portions 1 of the two-sided parallel concave portion 11 are formed.
A circular press-fitting hole 22 is formed in the bottom portion 21 connecting the two along the axis of the output shaft 2a. The output shaft 2a is drivingly connected to the driven shaft 3 shown in FIG.

The joint 41 is formed with a pair of arc-shaped guide walls 43 as guide walls extending along the axial direction on the periphery of the bottom portion 4a. The outer diameter of the arc-shaped guide wall 43 matches the outer diameter of the joint 41, and the inner diameter of the arc-shaped guide wall 43 is the output shaft 2.
It is formed slightly larger than the outer diameter of a. In addition, the pair of arc-shaped guide walls 43 are arranged such that the center line connecting the circumferential centers of the arc-shaped guide walls 43 passes through the axial center of the joint 41, and 2 along the direction orthogonal to the center line. A plane parallel convex portion 13 is formed. Further, the two-plane parallel convex portion 13 is formed so that its center passes through the axial center of the joint 41.

A joint 4 is attached to the tip of the two-surface parallel convex portion 13.
1. A press-fitting hole 22 formed in the output shaft 2a along the shaft center of No. 1
A cylindrical press-fitting portion 44 that is press-fitted in is formed to extend. Next, a method of connecting the joint 41 and the output shaft 2a will be described.

First, the two-plane parallel convex portion 13 of the joint 41 is press-fitted into the two-plane parallel concave portion 11 of the output shaft 2a. At this time, the arc-shaped guide wall 43 functions as a guide, so that the joint 41 and the output shaft 2a are smoothly connected. Further, since the press-fitting portion 44 is press-fitted into the press-fitting hole 22, the output shaft 2a and the joint 41 are easily aligned with each other.

As described in detail above, the second embodiment has the following features. (1) Since the inner diameter of the arc-shaped guide wall 43 is formed to be slightly larger than the outer diameter of the output shaft 2a, the joint 41 has the output shaft 2a
It is easy to connect

(2) The press-fitting hole 2 is provided along the axis of the output shaft 2a.
2 is formed, and the press-fitting portion 44 is formed along the axis of the joint 41.
Was formed. Therefore, when the output shaft 2a and the joint 41 are connected, their axial centers easily coincide with each other. Further, even when the output shaft 2a and the joint 41 are integrally rotated, the shaft center does not shift, and the deviation of the motor torque applied to the two-plane parallel convex portion caused by the shaft center shift disappears.

In addition to the above, the present invention can be embodied in the following forms. In the above embodiment, the two-plane parallel convex portion 13 and the two-plane parallel concave portion 11 are provided between the output shaft 2 and the joint 4 of the DC motor 1.
The arc-shaped crimping wall 14 is formed, but the two-plane parallel convex portion 13 is similarly formed between the driven shaft 3 and the joint 4.
The two-sided parallel recess 11 and the arc-shaped crimping wall 14 may be formed.

In the above embodiment, the output shafts 2 and 2a of the DC motor 1 are applied, but the present invention may be applied to shafts other than the output shafts 2 and 2a. In the above embodiment, the DC electric motor 1 is embodied as the rotating electric machine, but may be applied to other motors or generators as long as it is a rotating machine provided with the output shafts 2 and 2a.

In the above embodiment, the joints 4 and 41 are made of sintered metal, but other materials may be used as long as they can be formed without cutting the knurls 16. In the above embodiment, only one two-sided parallel convex portion 13 and the corresponding two-sided parallel concave portion 11 are provided, but a plurality of two-sided parallel convex portions 13 and the corresponding two-sided parallel concave portion 11 may be provided. .

In the above embodiment, the pair of arc-shaped crimping walls 1
Although the four or arc-shaped guide walls 43 are provided, the one or more arc-shaped crimping walls 14 or the arc-shaped guide walls 43 may be provided. Further, the arc-shaped crimping wall 14 or the arc-shaped guiding wall 43 may be formed in a cylindrical shape.

In the above embodiment, the two-sided parallel concave portion 11 and the two-sided parallel convex portion having the pair of flat surface portions 12 are provided, but the shapes of the concave portion and the convex portion are surfaces that engage with each other in the rotation direction of the output shaft 2. If it has, it is not limited to this.

In the above embodiment, the arc-shaped crimping wall 1
4, at least a part of the arc-shaped guiding wall 43 is a two-sided parallel convex portion 1
It is formed so as to protrude from 3. Even in this case, the output shafts 2 and 2a can be guided.

In the second embodiment, the press-fitting hole 22 is formed in the output shaft 2a and the press-fitting portion 44 is formed in the joint 41. However, the press-fitting portion 44 is formed in the output shaft 2a and the press-fitting hole 22 in the joint 41.
May be formed.

In the second embodiment, the joint 41 has only one press-fitting portion 44, but a plurality of press-fitting portions 44 may be provided. In this case, the press-fitting hole 22 corresponding to the press-fitting part 44 is formed in the output shaft 2a.
Prepare for multiple.

The technical idea that can be understood from the above embodiment will be described below. (A) In the joint according to claim 1 or 2, with respect to the press-fitting portion formed in the recess of the output shaft,
A joint characterized in that a press-fitting hole to be press-fitted is formed at the tip of the convex portion. As a result, the joints and the output shafts are easily aligned with each other. Further, when the joint and the output shaft rotate integrally, the shaft center does not shift, and abnormal noise and vibration can be suppressed.

[0053]

As described above in detail, according to the invention described in claims 1 to 7, it is possible to provide a small-sized joint capable of preventing the idling of the output shaft at a low cost.

According to the invention described in claim 8, it is possible to provide a rotating electric machine with less idling with the joint.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint according to a first embodiment.

FIG. 2 is a perspective view of a tip of an output shaft and a joint according to the first embodiment.

3A is a front view of the joint according to the first embodiment, and FIG. 3B is a side view of the joint.

FIG. 4 is a perspective view of a tip of an output shaft and a joint according to a second embodiment.

FIG. 5 is a sectional view of a conventional joint.

[Explanation of symbols]

1 ... DC motor, 2 and 2a ... output shaft, 3 ... driven shaft,
4, 41 ... Joint, 11 ... 2-side parallel concave portion, 12 ... Flat surface portion, 13 ... 2-side parallel convex portion, 14 ... Arc-shaped crimping wall, 15 ...
Engaging surface, 16 ... Knurl, 22 ... Press-fitting hole, 43 ... Arc-shaped guide wall, 44 ... Press-fitting part.

Claims (8)

[Claims] 1. A joint for connecting an output shaft (2, 2a) and a driven shaft (3), wherein a recess (11) having a plane (12) formed on the output shaft (2, 2a) and parallel to the axial direction. ), A convex portion (13) having a flat surface (15) that engages with the flat surface (12) in a rotational direction, and a guide wall (14) formed along the outer circumference of the output shaft (2, 2a). , 43), and a joint. 2. The joint according to claim 1, wherein the guide wall (14, 43) is formed so as to protrude from the convex portion (13). 3. The projection (13) is provided with a press-fitting portion (44) to be press-fitted into a press-fitting hole (22) formed in the recess of the output shaft (2a). The joint according to claim 1 or 2. 4. The guide wall (14) is in pressure contact with the outer peripheral surface of the output shaft (2).
The joint according to claim 3. 5. The guide wall (43) is connected to the output shaft (2).
Joint according to any one of claims 1 to 3, characterized in that it has an inner diameter slightly larger than the outer diameter of a). 6. Knurl (16) on said plane (15)
The joint according to any one of claims 1 to 5, wherein the joint is engraved. 7. The joint according to claim 1, wherein the joint is made of sintered metal. 8. A rotary electric machine in which the joint according to any one of claims 1 to 7 is fixed to an output shaft (2, 2a).