JPH073818Y2 - Assembly structure of motor rotation detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an assembly structure of a small motor rotation detector used for a member device such as an electrical component.

[Problems to be Solved by Prior Art and Invention] Generally, in this kind of motor, the rotation detector of the motor is used to detect rotation of the motor and perform various controls. There is a sensor (lead switch) configured to detect rotation by switching the rotation detection sensor ON and OFF. However, in the conventional one, the substrate on which the rotation detection sensor is attached is fixed to the casing by a fixing means such as a screw, and the wiring penetrated through the casing in the casing is welded to the substrate to form a sensor assembly. The asssi is opposed to a driven gear that meshes with an output gear formed on the armature shaft, and motor rotation is detected by detecting the rotation of a magnet provided on the driven gear.

However, since such a sensor assembly needs to be installed in a state where the wiring is passed through the casing, it is troublesome, complicated and inferior in workability. Moreover, the incorporated sensor assembly has a bottom surface (or surface) of the output gear casing. Therefore, the casing for the output gear needs to be thick in the axial direction to secure a large mounting space, and improvement has been required.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing an assembly structure of a motor rotation detector capable of eliminating these drawbacks. A motor rotation detector comprising a magnet and a rotation detection sensor that is sensitive to changes in perspective of the magnet. When mounting the motor rotation detector on a motor, an armature shaft rotatably supported on a yoke is The magnet is fixed to the protruding portion of the armature shaft from the bottom side of the yoke opposite to the output side in the axial direction, while the rotation detection sensor and the wiring are fixed to the outer surface of the bottom of the yoke. A substrate guide for guiding the substrate in the axial direction from the applied opening side to set the rotation detection sensor to the magnet facing position and a wiring guide for drawing the wiring to the outside are formed. And a bottomed casing, and a sensor holder that is fitted into the casing from the opening side to close the substrate guide and the wiring guide to support the substrate and the wiring from coming off, and form a sensor atsie. It is characterized by being integrally fixed to the outer surface of the bottom portion.

The present invention has such a structure that the sensor assembly can be easily incorporated and the output gear casing is not made thick.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a motor assembly of a vehicle electric component, and the motor assembly 1 is an armature (rotor).
2, a yoke 3 that covers the armature 2, a driven gear 4 that meshes with an output gear 2b provided at one end of the armature shaft 2a, a magnet 5 fixed to the inner peripheral surface of the yoke 3, and a commutator 2d of the armature 2. It is the same as that of the related art that it is configured by various member devices such as the brush 6 which comes into contact with the brush 6.

Reference numeral 7 is a casing for a rotation detector integrally provided at the other end of the yoke 3 opposite to the side where the output gear 2b is formed. The casing 7 has a bottomed outer end. In addition, a magnet space 7a in which a magnet 8 integrally provided at the other end of the armature shaft 2a is loosely fitted is secured in the inner portion thereof, and the magnet 8 is provided at a circumferential position facing the magnet space 7a. A rotation detection sensor (lead switch) 9 that senses ON / OFF switching to detect rotation is provided.

That is, the pair of lead wires 9a of the rotation detection sensor 9 and the pair of wires 11 for external output are electrically connected via the substrate 10 to which both are fixed. A substrate guide 7b for guiding both ends of 10 in the axial direction is formed with a groove. Then, the substrate 10 can be guided by the substrate guide 7b and set to a position facing the magnet space 7a at the inner side of the casing. Further, the casing 7 is formed with a wiring guide 7c for pulling out the pair of wirings 11 connected to the substrate 10 to the outside. The wiring guide 7c is spaced from both ends of the substrate 10. The wires 11 extending in the outer diameter direction toward the sides facing each other in the circumferential direction, and the wires 11 closely facing each other are further bent in parallel toward the outside in the axial direction, from the bottom of the casing 7. It is designed to be pulled out to the outside.
In other words, a pair of insertion grooves 7d are formed in the outer peripheral surface of the substrate guide 7b of the casing 7 on the outer peripheral surface thereof so that the wirings 11 extending from the substrate 10 in the outer peripheral direction are respectively inserted. It has a structure that extends toward the casing opening side together with the tongue portion 7e, and further, on the outer diameter side of this tongue portion 7e, a wiring 11 drawn outward from the casing 7 is held from the outer diameter side. A support piece portion 7f for supporting is formed on the support piece portion 7. The support piece portion 7f is formed with an opening 7g through which one wire 11 is gradually passed.

On the other hand, reference numeral 12 denotes a sensor holder, and the sensor holder 12 has a fitting portion 12a fitted into the board guide 7b and an insertion groove 7d.
The insertion portion 12b is inserted into the casing 7, and the insertion portion 12c is formed so as to be inserted in a state of being retained in the outer diameter direction from the opening 7g, and the sensor assembly 13 is fitted and attached from the opening side to the casing 7 in which the sensor is set. It is built in. The sensor assembly 13 incorporated in this way is attached to the other side of the yoke 3 by integrally fixing it.

The sensor holder 12 is configured to be retained and held by the locking claws 7h protruding from the tongue piece 7e.

In the embodiment of the present invention constructed as described above, when the armature 2 rotates, the rotation is detected by the rotation detecting sensor 9 which is sensitive to the magnet 8 provided at the other end of the armature shaft 2a. However, the rotation detecting sensor 9 is not provided on the casing 4a side of the driven gear 4 as in the prior art, but is provided on the other end of the yoke 3, and accordingly, the thickness of the driven gear side casing 4a is increased. However, since the space for installing the sensor is secured, the wall thickness does not increase. Moreover, the sensor assembly 13 can be compactly assembled and arranged within the diameter of the motor yoke 3, so that the sensor assembly 13 can be made compact.

Moreover, since the rotation of the armature shaft 2a is directly detected in this type, the detection accuracy is improved as compared with the conventional type that detects the rotation of the decelerated driven gear 4, and the control operation based on the detection is performed. It can be done more accurately.

In addition, the sensor assembly 13 pre-assembles the rotation detection sensor 9 and the wiring 11 on the board 10 independently of the casing 7, and guides the board 10 to the board guide 7b to set it in the back of the casing 7. Pull out the wiring 11 to the outside through the wiring guide 7c.
The sensor assembly 13 can be assembled by simply inserting it into the casing 7, and the sensor assembly 13 thus formed can be fixed to the yoke 3. Therefore, in the state where the wiring is passed through the casing as in the conventional case, the troublesome and complicated work of welding the wiring and the substrate becomes unnecessary, and the welding work is easy and excellent in workability. Assembling the sensor assembly 13 is also simplified, and the workability can be remarkably improved.

[Effects] In summary, since the present invention is configured as described above, the rotation detection sensor senses the displacement of the magnet that rotates integrally with the armature shaft, and the motor rotation is detected. Therefore, the rotation of the armature shaft can be directly detected, and the detection accuracy is improved as compared with the conventional rotation detection of the driven gear that has been decelerated.

In addition, the sensor assembly guides the board on which the rotation detection sensor and the wiring have been welded beforehand to the board guide to set it in the interior of the casing, and pulls the wiring out through the wiring guide to the outside, and in this state inserts the sensor holder into the casing. It can be assembled simply by setting, and the sensor assembly thus formed may be fixed to the end of the yoke. Therefore, the work of assembling the sensor assembly is greatly simplified, and the workability can be greatly improved.

In addition, since the built-in sensor assembly is attached to the end of the yoke, the driven gear casing does not become thick unlike the conventional driven gear casing, and the mounting space can be reduced, which is convenient. good.

[Brief description of drawings]

FIG. 1 shows an embodiment of an assembly structure of a motor rotation detector according to the present invention. FIG. 1 is a front view of an electric motor, FIG. 2 is a sectional plan view of the same as above, and FIG. Cross-sectional side view of the driven gear part, Fig. 4 is a cross-sectional side view of the rotation detector part, and Fig. 5 V, W, X, Y, Z are front, side, rear, plan and bottom views of the casing. , Fig. 6 V, W, X, Y are AA, B- in Fig. 5.
B, CC, DD sectional views, FIG. 7 V, W, X, Y are front view, side view, rear view and plan view of the sensor holder, FIG. 8 is AA of FIG.
A sectional view, FIG. 9 is a side view of the sensor assembly, FIG. 10 is a sectional view taken along the line AA of FIG. 9, and FIG. 11 is a sectional side view of the sensor holder. In the figure, 1 is a motor assembly, 2 is an armature, 3 is a yoke, 7 is a casing for a rotation detector, 7a is a magnet space, 7b is a substrate guide, 7c is a wiring guide, 8 is a magnet, 9 is a rotation detection sensor, and 10 is A substrate, 11 is wiring, 12 is a sensor holder, and 13 is a sensor assembly.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A motor rotation detector comprising a magnet and a rotation detection sensor which is sensitive to changes in perspective of the magnet. The motor rotation detector is rotatably supported by a yoke when the motor rotation detector is mounted on a motor. The armature shaft is projected outward in the axial direction from the yoke bottom side opposite to the power output side, and the magnet is fixed to the protruding part of the armature shaft, while the rotation detection sensor and the wiring are fixed to the substrate. A board guide for guiding the board in the axial direction from the opening side applied to the outer surface of the bottom of the yoke to set the rotation detection sensor to the magnet facing position and a wiring guide for drawing out the wiring to the outside are formed. A sensor having a bottomed casing and a sensor holder that is fitted into the casing from the opening side to close the board guide and the wiring guide to prevent the board and wiring from coming off. Forming a Tsushi, assembly of the motor rotation detector characterized by comprising integrally secured to the sensor Atsushi over to the yoke bottom outer side structure.