JP6714243B2 - Angle detector - Google Patents

Description

The present invention relates to an angle detection device that detects a rotation angle.

As an angle detecting device of this type that has been conventionally used, for example, the configuration shown in Patent Document 1 below can be cited. That is, in the conventional configuration, the resolver unit is fixed to the outer surface of the motor housing with the mounting bolt, and the cover is attached to the motor housing so as to cover the resolver unit.

Utility model registration No. 2543173

In the conventional configuration as described above, since the resolver unit is fixed to the motor housing, a cover for covering the resolver unit is required in addition to the motor housing, resulting in an increase in the number of parts. Although it is conceivable to incorporate the resolver unit in the motor housing in order to reduce the number of parts, means for restricting rotation of the resolver unit with respect to the motor housing is required.

The present invention has been made to solve the above problems, and an object thereof is to store an angle detection unit in an outer housing and at the same time, to prevent rotation of the angle detection unit with respect to the outer housing. It is to provide a detection device.

An angle detection device according to the present invention includes an angle detection unit having a detection shaft, a unit main body that detects a rotation angle of the detection shaft, and a unit case that stores the unit main body, and an outer housing that stores the angle detection unit. The housing is provided with a housing through hole that communicates the inside and the outside of the outer housing, and the unit case is provided with a recess having a wall extending in a direction intersecting with the rotation direction of the detection shaft. A cylindrical stopper having a convex portion inserted into the concave portion is fitted into the through hole.

According to the angle detecting device of the present invention, since the convex portion of the cylindrical stopper fitted in the housing through hole of the outer housing is inserted into the concave portion of the unit case, the angle detecting unit can be stored in the outer housing. The rotation of the angle detection unit with respect to the outer housing can be restricted.

FIG. 3 is a sectional view showing the angle detection device according to the first embodiment of the present invention. It is a perspective view which shows the stopper of FIG. It is explanatory drawing which shows a unit case and a stopper when it sees along the axial direction of the detection axis|shaft of FIG. It is sectional drawing which shows the angle detection apparatus by Embodiment 2 of this invention.

Hereinafter, modes for carrying out the present invention will be described with reference to the drawings.
Embodiment 1.
1 is a cross-sectional view showing an angle detection device according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a stopper 3 of FIG. 1, and FIG. 3 is an axial direction of a detection shaft 10 of FIG. It is explanatory drawing which shows the unit case 12 and the stopper 3 at the time of seeing. As shown in FIG. 1, the angle detection device of this embodiment includes an angle detection unit 1, an outer housing 2 and a stopper 3.

The angle detection unit 1 has a detection shaft 10, a unit body 11 and a unit case 12. The detection shaft 10 is a shaft connected to an angle detection target (not shown) such as a motor.

The unit main body 11 is configured to detect the rotation angle of the detection shaft 10. The unit main body 11 of the present embodiment has a resolver 110 including a resolver rotor 110a and a resolver stator 110b, and a transformer 111 including a transformer rotor 111a and a transformer stator 111b. The resolver rotor 110a and the transformer rotor 111a are fixed to the detection shaft 10 and rotatably provided integrally with the detection shaft 10. The resolver stator 110b and the trans stator 111b are fixed to the inner wall of the unit case 12 so as to face the resolver rotor 110a and the transformer rotor 111a, respectively.

An input line 112 for inputting an excitation signal to the transformer stator 111b is connected to the transformer stator 111b. An output line 113 for outputting an output signal from the resolver 110 is connected to the resolver stator 110b. The input line 112 and the output line 113 form a code extending from the angle detection unit 1. The number of input lines 112 and output lines 113 is arbitrary.

The unit main body 11 is not limited to the above configuration and may have another configuration such as a synchro or an encoder.

The unit case 12 is a case that houses the unit main body 11. The unit main body 11 of the present embodiment has a double structure having the inner layer 12a and the outer layer 12b, but the unit main body 11 can also have another structure such as a single layer structure. The unit case 12 is provided with a case annular wall 120 that extends in the axial direction of the detection shaft 10 so as to cover the outer peripheral surfaces of the resolver 110 and the transformer 111. The resolver stator 110b and the trans stator 111b described above are fixed to the inner wall of the case annular wall portion 120.

The case annular wall portion 120 is provided with a first case through hole 120a through which the input line 112 is inserted and a second case through hole 120b through which the output line 113 is inserted. In the present embodiment, the first case through hole 120a is provided at the axial end portion of the case annular wall portion 120, and a pair of side walls 120c (walls) extending in a direction intersecting the rotation direction of the detection shaft 10 are provided. Part) is formed. The side wall 120c of the present embodiment extends parallel to the radial direction of the detection shaft 10.

The outer housing 2 is a housing that houses the angle detection unit 1. The outer housing 2 may house the angle detection unit 1 and other components such as a reduction mechanism or a motor. Other configurations stored in the outer housing 2 are optional.

The outer housing 2 is provided with a housing end wall portion 20 and a housing annular wall portion 21. The housing end wall 20 is a disk-shaped wall located outside the case end wall 120 in the axial direction of the detection shaft 10. The housing end wall portion 20 includes a lid body 200 that is detachably provided. The lid body 200 is a disk-shaped member provided coaxially with the angle detection unit 1. A bearing 200 a that pivotally supports one end of the detection shaft 10 is attached to the lid body 200.

The housing annular wall portion 21 is an annular wall body that extends in the axial direction of the detection shaft 10 from the outer edge of the housing end wall portion 20, and is located outside the case annular wall portion 120 in the radial direction of the detection shaft 10.

A housing through hole 21 a is provided in the housing annular wall portion 21. The housing through hole 21 a is a hole that communicates the inside and the outside of the housing annular wall portion 21, and penetrates the housing annular wall portion 21 along the radial direction of the detection shaft 10. The housing through hole 21a is located outside the first case through hole 120a in the radial direction of the detection shaft 10, and is arranged at the same angular position as the first case through hole 120a with respect to the rotation direction of the detection shaft 10. There is. In other words, when the housing through hole 21a is viewed along the radial direction of the detection shaft 10, the housing through hole 21a is arranged so as to overlap the first case through hole 120a. The input line 112 and the output line 113 are led out to the outside of the outer housing 2 through the housing annular wall portion 21.

The stopper 3 is a tubular body fitted in the housing through hole 21a. The input line 112 and the output line 113 are inserted inside the stopper 3. As shown in FIG. 2, the stopper 3 is provided with an annular stopper body 30 and a convex portion 31 in which a part of the stopper body 30 extends in the axial direction of the stopper body 30.

As shown in FIG. 1, when the stopper 3 is fitted in the housing through hole 21 a, the convex portion 31 of the stopper 3 is inserted in the first case through hole 120 a (recessed portion) of the unit case 12. When the angle detection unit 1 is about to rotate with respect to the outer housing 2, the protrusion 31 is brought into abutment with the side wall 120c (wall portion) of the first case through hole 120a, so that the angle detection unit 1 with respect to the outer housing 2 moves. Rotation is restricted.

In such an angle detecting device, the convex portion 31 of the cylindrical stopper 3 fitted into the housing through hole 21a of the outer housing 2 is inserted into the first case through hole 120a (recess 122) of the unit case 12. Therefore, the rotation of the angle detection unit 1 with respect to the outer housing 2 can be regulated while the angle detection unit 1 is stored in the outer housing 2. In particular, the input line 112 and the output line 113 (cord) extending from the angle detection unit 1 are inserted inside the stopper 3. That is, the hole for leading out the cord 112 to the outside of the outer housing 2 is also used for regulating the rotation of the angle detection unit 1. Thereby, it is possible to avoid providing the hole in the outer housing 2 only for the purpose of restricting the rotation of the angle detection unit 1.

Embodiment 2.
FIG. 4 is a sectional view showing an angle detecting device according to a second embodiment of the present invention. As shown in FIG. 4, in the second embodiment, the outer peripheral surface of the lid body 200 of the housing end wall portion 20 and the outer peripheral surface of the convex portion 31 of the stopper 3 are extended so as to intersect with the rotation direction of the detection shaft 10. The housing end wall flat surface portion 200b and the stopper flat surface portion 31a are provided. The housing end wall flat surface portion 200b and the stopper flat surface portion 31a are arranged so as to abut each other when the angle detection unit 1 attempts to rotate in the rotation direction of the detection shaft 10 with respect to the outer housing 2. The housing end wall flat surface portion 200b and the stopper flat surface portion 31a are abutted against each other, whereby the rotation of the angle detection unit 1 with respect to the outer housing 2 is restricted.

The housing end wall flat surface portion 200b and the stopper flat surface portion 31a may be arranged in contact with each other or may be arranged in close proximity to each other. When the housing end wall flat surface portion 200b and the stopper flat surface portion 31a are arranged close to each other, the upper limit of the distance between the housing end wall flat surface portion 200b and the stopper flat surface portion 31a is the upper limit of the angle detection unit 1 with respect to the outer housing 2. Under the condition that the housing end wall flat surface portion 200b and the stopper flat surface portion 31a are abutted against each other when the housing end wall flat surface portion 200b and the stopper flat surface portion 31a try to rotate in the rotation direction of the detection shaft 10, It can be determined according to the extension width. Other configurations are the same as those in the first embodiment.

In such an angle detection device, the housing end wall flat portion 200b of the housing end wall portion 20 and the convex portion of the stopper 3 are arranged so that the angle detection unit 1 abuts each other when the angle detection unit 1 tries to rotate with respect to the outer housing 2. Since the stopper flat portion 31a of 31 is arranged, in addition to the rotation regulation by the convex portion 31 and the concave portion 122 described in the first embodiment, the rotation of the angle detection unit 1 with respect to the outer housing 2 can be regulated. Thereby, even when the rotation torque of the angle detection unit 1 is large, the rotation of the angle detection unit 1 with respect to the outer housing 2 can be more reliably restricted.

1 Angle detection unit 10 Detection axis 11 Unit body 112 Input line (code)
113 Output line (code)
12 unit case 120a 1st case through hole (recess)
120c Side wall (wall part)
2 Outer housing 21a Housing through hole 200b Housing end wall flat part 3 Stopper 31 Convex part 31a Stopper flat part

Claims (3)

An angle detection unit having a detection shaft, a unit body for detecting the rotation angle of the detection shaft, and a unit case for housing the unit body;
An outer housing that stores the angle detection unit,
The outer housing is provided with a housing through hole that communicates the inside and the outside of the outer housing,
The unit case is provided with a recess having a wall portion extending in a direction intersecting the rotation direction of the detection shaft,
A cylindrical stopper having a convex portion inserted in the concave portion is fitted in the housing through hole. The angle detection device according to claim 1, wherein a cord extending from the angle detection unit is inserted inside the stopper. The outer housing is provided with a housing end wall portion located outside the recess in the axial direction,
The housing end wall portion and the stopper are provided with a housing end wall flat surface portion and a stopper flat surface portion extending so as to intersect with the rotation direction,
The flat surface portion of the housing end wall and the flat surface portion of the stopper are arranged so as to abut each other when the angle detection unit tries to rotate in the rotation direction with respect to the outer housing. The angle detection device according to claim 1 or 2.

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