JP2001352717A - Coupling for rotational angle detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure capable of eliminating the need for disposing a rotational angle detector at a distant from an object to be detected even in the case of a coupling structure for facilitating removal from a motor for the rotational angle detector, a coupling structure of conducting relatively moderate thermal conduction from a heater for the motor to the rotational angle detector, or a structure with a thick coupling for the rotational angle detector. SOLUTION: The mounting position of the coupling 1 on the rotational angle detector 0 is set so as to be positioned on the rotational angle detector 0. To mount the rotational angle detector 0 and the motor 2, the coupling 1 is fixed on a cover 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling of a rotation angle detector coupled to a rotating body such as an input shaft of a motor for detecting a rotation angle, and more particularly to a leaf spring type coupling.

[0002]

2. Description of the Related Art The role of a coupling in a rotation angle detection device is to not only fasten a rotation body such as a motor to a rotation body but also to protect a bearing of the rotation angle detection device and a processing circuit board. Vibration from rotating shaft of rotating body
It can also absorb shocks and the like. The error component in the rotation angle detection device includes a pitch error of the diffraction slit in the optical detection method, a cycle error corresponding to the number of times of the shaft angle in the magnetic detection method, and an error of one cycle per rotation. This increases almost in proportion to the amount of shaft runout of the rotating shaft. The error of one cycle per rotation can be reduced by how much the coupling can absorb the runout of the rotating shaft, and the structure, shape, mounting position, and the like of the coupling have become increasingly complicated in recent years. I am following.

[0003] A technique related to coupling of a conventional rotation angle detecting device will be described below with reference to the drawings. 7 is a cross-sectional view showing an example of a state in which a coupling is attached to a conventional rotation angle detection device, and FIG. 8 is a cross-sectional view showing an example of a state in which the rotation angle detection device of FIG. 7 is attached to a motor. , The same parts are denoted by the same reference numerals. According to FIG. 7, the coupling 1c is a bearing 9 of the rotating shaft 5 of the rotation angle detecting device 0.
e, having a hole through which a joint portion with 9f can be passed, and disposed below the rotating shaft 5. Coupling 1
c is attached to the rotation angle detection device 0 by providing a tapped hole on the lower side of the housing 6 and bolts 701a, 701
Fix in two places with b. In general, the superiority of the coupling in the rotation angle detection device is the restriction (rigidity) in the rotation direction.
And the flexibility (elasticity) in the radial direction and the balance from the center of rotation. Therefore, although the coupling 1c is a leaf spring type coupling that is rich in elastic deformation, it is bent in the vicinity of being fixed to the housing 6 to have flexibility in the radial direction. Further, the coupling 1c in FIG. 8 is also bent in the vicinity of being fixed to the flange 13 of the motor 2. The distance from the center C of the rotating shaft 5 for bending in FIG. 7 is substantially the same as the distance from the center C of the rotating shaft 5 for bending in FIG. As a result, unique resonance vibrations associated with the rotation speed are avoided. Also, as shown in FIG. 8, a cover 11 of the rotation angle detecting device 0 is attached to the motor 2. The cover 10 of the cover 11 is made of a metal having good heat conduction efficiency so as to promote a heat radiation effect. In removing the rotation angle detection device 0, it is difficult to remove the rotation angle detection device 0 only by removing the cover 10 of the cover 11 because the stop position of the coupling 1c is on the back side, At that time, the cover 11 had to be removed. Furthermore, when the object to be detected is a heating element such as the motor 2 as in the above example, the heat generated from the coil end of the motor 2 heats the flange 13 and conducts heat through the coupling 1c. Thus, the rotation angle detection device 0 is adversely affected.

FIG. 9 is a sectional view showing an example of a coupling 901 to be attached to a conventional rotation angle detecting device 0. As shown in FIG. The coupling 901 is provided with a wave 902 concentrically when viewed from the rotation center C in order to absorb a load in the radial direction. Since the waves 902 are arranged concentrically with respect to the rotation center C, they succeed in absorbing the radial load without significantly impairing the constraint in the rotation direction. However, the attachment of the wave 902 increases the thickness of the coupling 901. As the thickness of the coupling 901 increases, the rotation angle detector 0
Must be mounted away from the coupling surface or coupling shaft of the motor 2 or the like. In addition to the example,
Japanese Patent Publication No. 820 discloses an example in which a motor main body and an encoder (rotation angle detecting device) main body are connected by a thin plate spring having an S-shaped cross section. Thus, the rotation angle detection device 0
Is mounted away from the coupling shaft of the motor 2 or the like, the amount of shaft runout of the sensing unit 7 apparently increases, and 1
Not only the periodic error increases, but also a bending occurs at the joint portion of the shaft, resulting in a detection error. In addition, in all of the couplings 1c and the like shown so far, the mounting positions for the rotation angle detection device 0 are arranged below the rotation angle detection device 0. Coupling 1c and other bearings 9
e, 9f, the signal processing circuit board 3 and the shaft runout are absorbed. Since the bearings 9e, 9f are located relatively below the rotation angle detecting device 0, the bearings 9e, 9f are protected. The protection of the sensing unit 7 and the signal processing circuit board 3 disposed relatively above the rotation angle detection device 0 tends to be somewhat sparse.

[0005]

In the above-described leaf spring type coupling 1c of the rotation angle detecting device 0, when the rotation angle detecting device 0 is to be detached from the motor 2 or the like, the coupling 1c is required. Bolt 801
a, 801b are located on the back side,
Unless the cover 11 as well as the lid 10 of the coupling 1c is removed, it is difficult to remove the rotation angle detecting device 0. To avoid this difficulty, if the size of the cover 11 is increased, the bolts 801a, 80
Although it is easy to tighten and loosen 1b, extra space is required. When the object to be detected by the rotation angle detection device 0 is the motor 2 or the like, the coupling 1c is connected to the main body of the motor 2 (the flange 13).
), The heat generated from the coil end of the motor 2 is transmitted through the coupling 1c.
And had an adverse effect. In addition, as described above, in order to improve the coupling performance, a bending or wave 902 may be provided on the coupling surface to improve the absorbability of the load in the radial direction. As a result, the thickness of the coupling itself increases, and the rotation angle detection device 0 moves away from the rotation shaft 5 such as the motor 2. The fact that the detection side moves away from the object whose rotation angle is to be detected is determined by one rotation per rotation
Not only does the cycle error increase, but the deflection near the joint of the shafts increases, causing a unique error component. Further, the arrangement of the coupling 1c below the rotation angle detection device 0 means that vibrations and the like absorbed by the coupling are suppressed with respect to a relatively lower portion of the rotation angle detection device 0, Conversely, it is sparse relative to the upper side of the rotation angle detector 0.

The present invention has been made in view of the above circumstances, and an object of the present invention is to remove a cover of a cover when removing a rotation angle detection device from a motor or the like. The device can be removed,
Even when the object to be detected by the rotation angle detection device is a heating element such as a motor, the heat gradient to the rotation angle detection device can be made relatively gentle, and the rotation angle detection device can be bent into a coupling. Even if waves or waves are added, it is not necessary to move the rotation angle detection device away from an object to be detected, such as a motor, and the vibration applied to the rotation angle detection device is not biased upward or downward of the rotation angle detection device. To provide a coupling for a rotation angle detecting device.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a coupling for connecting a rotating body as an object to be detected to a lower side of a rotation angle detecting device, wherein the cup is provided above the rotation angle detecting device. This is attained by providing a coupling of the rotation angle detecting device, wherein the mounting position of the ring is arranged. Still further, the present invention is attained by providing a coupling of a rotation angle detection device, wherein the coupling position of the coupling can be arranged on both the upper side and the lower side of the rotation angle detection device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the coupling of the rotation angle detecting device of the present invention, since the coupling position of the coupling to the rotation angle detecting device is arranged on the upper side, the coupling angle of the rotation angle detecting device can be reduced. It can be done easily. Further, the detection object is arranged closer to the object to be detected because the coupling is mounted on the upper side of the rotation angle detection device, so that the rotation angle detection device can perform more accurate angle detection.

An embodiment of the coupling of the rotation angle detecting device according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of an attachment state of a coupling of the present invention with a rotation angle detecting device. FIG. 2 shows an example of a case where a rotation angle detecting device provided with a coupling of the present invention is attached to a motor. FIG. It should be noted that FIG.
The same components as those of FIG. 8 are denoted by the same reference numerals. According to FIG. 1, the coupling 1 is arranged above the signal processing circuit board 3 of the rotation angle detecting device 0 so as not to contact. Coupling 1 to rotation angle detector 0
First, the coupling 1 is bent downward at a position slightly larger than the outer shape of the housing 6 of the rotation angle detecting device 0. The housing 6 has a structure provided with a tapped hole in the radial direction from the outer peripheral surface side, and the coupling 1 is tightened at this position with bolts 101a and 101b. Next, according to FIG. 2, the coupling 1 is arranged on the upper side of the signal processing circuit board 3 as in FIG. 1, and the bending is provided at substantially the same distance from the center of rotation as in FIG. . Regarding the coupling between the coupling 1 and the cover 11, a downward bending is performed to return the bending to a horizontal direction again, and the bolts 201a and 201b are tightened by tap holes provided in the mounting surface of the cover 11. When the rotation angle detector 0 is attached to the motor 2 in this manner,
There is no direct contact between the flange 13 of the motor 2 and the coupling 1 of the rotation angle detection device 0, so that heat conduction is relatively poor. FIG. 3 is a plan view of FIG. 1 as viewed from above. According to this figure, when removing the rotation angle detection device 0 attached to the motor 2 or the like from the motor 2 or the like, the bolts 201a and 201b are removed after the lid 10 is removed.
And finally removing the fastening center bolt 4, the rotation angle detecting device 0 can be removed without removing the cover 11.
Can be removed.

An application example of a rotation angle detecting device provided with a coupling according to the present invention will be described below with reference to FIGS. 4 is a cross-sectional view of a rotation angle detecting device provided with two couplings of the present invention, FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, and FIG. 6 is a top view except for a lid 10 in FIG. FIG. According to FIG.
The couplings 1a and 1b are arranged on the upper side, and the lower coupling 1b is connected to the rotation angle detection device 0. The upper coupling 1a is a motor 2
Cover 11. According to FIG. 5, the upper coupling 1a is connected to the rotation angle detecting device 0, and the lower coupling 1b is connected to the flange 13 of the motor 2.
Is combined with 4 and 5 are orthogonal to each other. As can be seen from FIG. 6, a bolt 40 for attaching the two couplings 1a and 1b to the motor 2 side is used.
1a, 401b, 501a, 501b fastening work can be performed without interference. In this structure, it is difficult to remove the rotation angle detection device 0 only by removing the lid 10, and the cover 11 is also removed. However, by providing the two couplings 1a and 1b, the roles of the couplings 1a and 1b, such as protection of the bearings 9c and 9d, protection of the signal processing circuit board 3, or absorption of vibration and shaft runout, are higher. Will be done at the level. This is because the couplings 1a and 1b are arranged on both the upper side and the lower side of the rotation angle detection device 0, so that the bearings 9c and 9d are disposed relatively below the rotation angle detection device 0. Further, also for the signal processing circuit board 3 and the sensing unit 7 which are arranged relatively above the rotation angle detection device 0,
Unevenness such as vibration can be reduced. The rigidity of the two couplings 1a and 1b does not necessarily need to be equal, and various types can be used in consideration of the shock resistance and vibration resistance of the rotation angle detection device 0.

In the above description, the present invention has been described with reference to specific embodiments, but the present invention is not limited thereto. A rotation angle detection device provided with the coupling of the present invention is a kind of a so-called hollow rotary encoder having a through hole in a rotation shaft, or a bearing in which a diffraction slit or a rotor tooth is connected to an input shaft of a motor. Even if it is a rotation angle detecting device, it can be used as a coupling of the rotation angle detecting device of the present invention.

[0012]

As described above, according to the coupling of the rotation angle detecting device of the present invention, when the rotation angle detecting device is detached from the object to be detected, it can be relatively easily performed. Thus, an effect of reducing the number of replacement steps of the rotation angle detection device is achieved. In the case where the coupling of the rotation angle detection device of the present invention is disposed only above the rotation angle detection device, the coupling does not come into contact with the object to be detected. Not only can heat conduction to the angle detection device be relatively moderate, but also the rotation angle detection device can be arranged closer to the object to be detected, and a more accurate rotation angle detection device can be provided. Furthermore, in the case where the coupling of the rotation angle detection device of the present invention is disposed on both the upper side and the lower side of the rotation angle detection device, there is no bias in the vibration and impact applied to the upper and lower sides of the rotation angle detection device. And a high-quality rotation angle detection device can be provided. As described above, the position at which the coupling is attached to the rotation angle detection device can be freely arranged in the up and down directions, which also increases the degree of freedom in designing the coupling structure in what purpose the rotation angle detection device is intended. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a rotation angle detection device provided with a coupling of the present invention.

FIG. 2 is a cross-sectional view showing a rotation angle detection device provided with the coupling of the present invention together with a motor coupling portion.

FIG. 3 is a plan view of a rotation angle detection device including the coupling of the present invention.

FIG. 4 is a cross-sectional view showing a rotation angle detection device including two couplings according to the present embodiment, together with a coupling portion of a motor.

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

FIG. 6 is a plan view seen from above except for a cover in FIG. 5;

FIG. 7 is a cross-sectional view of a rotation angle detection device provided with a conventional coupling.

FIG. 8 is a cross-sectional view showing a rotation angle detection device provided with a conventional coupling together with a motor coupling portion.

FIG. 9 is a cross-sectional view illustrating an example of a conventional coupling.

[Explanation of symbols]

 0 Rotation angle detection device 1 Coupling 1a Coupling 1b Coupling 1c Coupling 2 Motor 3 Signal processing circuit board 4 Center bolt for fastening 5 Rotating shaft 6 Housing 7 Sensing unit 8 Rotor teeth 9a to 9f Bearing 10 Cover 11 Cover 12 Motor Input shaft 13 Flange 101a Bolt 101b Bolt 201a Bolt 201b Bolt 401a Bolt 401b Bolt 501a to 501d Bolt 701a Bolt 701b Bolt 801a Bolt 801b Bolt 901 Coupling 902 Wave

Claims (3)

[Claims] 1. A coupling for coupling a rotating body, which is an object to be detected, to a lower side of a rotation angle detection device, wherein an attachment position of the coupling is arranged above the rotation angle detection device. Characteristic coupling of rotation angle detection device. 2. The rotation device according to claim 1, wherein the rotation angle detection device is configured such that a mounting position of the coupling can be arranged on both an upper side and a lower side of the rotation angle detection device. Angle detection device coupling. 3. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is a hollow rotation angle detection device having a through hole at a substantially central portion of a rotation shaft. Detector coupling.