JP2001169512A - Encoder attachment device for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an attachment structure of an encoder, suppress the height as a whole to reduce dimensions of an encoder attachment device and, further, protect the encoder from a direct influence of the vertical motion of a rotary shaft of a motor. SOLUTION: A cut part 9 is formed in an end cover 1a of the motor 1. A plate 6, to which the encoder 4 is fixed, is mounted on a step 10 of the cutout 9 and attached to the end cover 1a. The encoder 4 is provided between a disc 2 of a brake device and the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor encoder mounting device for a forklift or the like.

[0002]

2. Description of the Related Art FIG. 4 shows an encoder mounting device for an electric motor in a reach type forklift. In the figure, 101 is an electric motor for running a forklift, 102 is a disk for braking the electric motor 101, 103 is a rotating shaft of the electric motor 101, 104 is an encoder for detecting the number of revolutions of the electric motor 101, and 105 is an encoder 10
4 is a bracket for mounting.

A disk 102 has a motor 101 at its center.
The rotation shaft 103 is penetrated, and the rotation of the electric motor 101 is braked by sandwiching the disk 102 with a holding member (not shown). Also, the encoder 10
Reference numeral 4 denotes a motor whose rotating shaft is connected to the end of the rotating shaft 103 of the electric motor 101, and which detects the number of rotations of the electric motor 101 by counting pulses generated by the rotation of the electric motor 101.

[0004] An encoder 104 has a bracket 105 bent in a U-shape so as to bypass the disk 102.
Of the bracket 10
5 is fixed to the end cover 101a of the electric motor 101 by a fixing member 106 such as a bolt.

[0005]

However, in the above-mentioned conventional device, the U-shaped bracket 105 is used to move the encoder 104 so as to bypass the disk 102.
And the mounting structure becomes complicated, and since the encoder 104 is located above the disk 102, the overall height increases and the device becomes large. Furthermore, since the vertical movement of the rotating shaft 103 of the electric motor 101 is directly transmitted to the encoder 104, there is a problem in reliability.

Accordingly, the present invention is to simplify the mounting structure of the encoder, to reduce the overall height and to reduce the size of the device, and to prevent the encoder from being directly affected by the vertical movement of the rotating shaft of the motor. Is an issue.

[0007]

According to the present invention, an encoder is mounted on an end cover of an electric motor and disposed between the brake device and the electric motor.

In this manner, the encoder can be mounted without using a U-shaped bracket, and the mounting structure is simplified. Further, since the encoder is located between the brake device and the electric motor, the entire height can be reduced by effectively utilizing the space which has conventionally been a dead space. Further, since the encoder is mounted separately from the rotating shaft of the motor, the encoder is not directly affected by the vertical movement of the rotating shaft of the motor.

In the present invention, a notch is provided in the end cover of the electric motor, and the encoder is positioned in the notch, so that the amount of protrusion of the encoder from the end cover is reduced, and the distance between the brake device and the electric motor is reduced. An encoder can be efficiently disposed in a limited space. If the notch is formed so as to open to the side of the end cover, the encoder can be attached and detached from the side without removing the brake device, thereby facilitating the operation.

In order to transmit the rotation of the motor to the encoder, a gear may be provided on each of the rotation shaft of the motor and the rotation shaft of the encoder so that the rotation of the motor is transmitted to the encoder via the gear. In this case, by setting the gear ratio to 1: 1, the rotation speed can be directly detected without requiring correction.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a partial sectional front view of an encoder mounting device for a motor according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a left side view of FIG. The disk is not shown in FIG. 1 to 3, reference numeral 1 denotes an AC motor for traveling mounted on a reach-type forklift, and 2 denotes a disk for applying a brake to the electric motor 1 as in the prior art, which constitutes a brake device of the present invention. A member that clamps the rotation of the electric motor 1 by sandwiching the disk 2 with a clamping member (not shown).

Reference numeral 4 denotes an encoder for detecting the number of revolutions of the electric motor 1, which is also the same as the conventional one, and detects the number of revolutions of the electric motor 1 by counting pulses generated by the rotation of the electric motor 1. Things. The output of the encoder 4 is given to a control device (not shown),
Is performed. The encoder 4 has a mounting leg 5 on the lower surface, and the mounting leg 5 is fixed to the plate 6 with screws or the like. The plate 6 is formed in a shape corresponding to the notch 9 as shown in FIG. 2, and has a U-shaped cut groove 8. The rotary shaft 7 led out from the lower surface of the encoder 4 is inserted into the cut groove 8.
A gear 13 to be described later is coaxially attached to the tip of the rotating shaft 7.

Reference numeral 9 denotes a notch formed on one side of the end cover 1a of the electric motor 1. The notch 9 is formed so as to open upward and leftward in FIG. Has a pair of opposing steps 10, 10, as shown in FIG. A plate 6 to which the encoder 4 is attached is placed on the steps 10 and 10, and the plate 6 is fixed to the steps 1 by fixing members 11 such as bolts.
At 0 and 10, they are fixed to the end cover 1a.

Thus, the encoder 4 is attached to the notch 9 of the end cover 1a via the plate 6, and is disposed between the disk 2 and the motor 1. This disk 2
The space between the motor 1 and the motor 1 is a space that was originally a dead space, and the encoder 4 is disposed by effectively using this space. As a result, since the encoder 4 is not positioned above the disk 2, the height of the
And the overall size becomes smaller.

Further, since the encoder 4 is mounted in the notch 9, the amount of protrusion of the encoder 4 from the end cover 1a is reduced, and even when the space between the disk 2 and the electric motor 1 is small, it is possible to cope with it. . 1, the encoder 4 is attached via the plate 6, but since the plate 6 does not need to be provided so as to bypass the disk 2, the plate 6 can have a simple structure of a flat plate.

Here, the size of the notch 9 is
The gear 13 provided on the rotating shaft 7 is selected to have a size that can be inserted from above and from the side. Therefore,
When assembling, first, the rotating shaft 7 of the encoder 4 is inserted into the cut groove 8 of the plate 6, and the mounting leg 5 of the encoder 4 is fixed to the plate 6 with a screw or the like, and
After the plate and the plate 6 are integrated, they are inserted into the notch 9 from above or from the side. Then, the plate 6 is placed on the steps 10, 10, and the plate 6 is fixed to the end cover 1a by the fixing members 11, 11.

In the above case, even when the disk 2 is attached to the main body of the electric motor 1, the integrated unit of the encoder 4 and the plate 6 can be cut out without removing the brake device including the disk 2. 9 can be inserted from the side (the left direction in FIG. 1 and the direction perpendicular to the paper surface in FIG. 3). Also, when the encoder 4 is removed for repair or the like, the encoder 4 can be taken out from the side of the notch 9 without removing the brake device including the disk 2. Therefore, according to the structure of the present embodiment, the encoder 4 can be easily attached and detached.

A gear 12 is coaxially mounted on the rotating shaft 3 of the electric motor 1 and meshes with the gear 13 of the rotating shaft 7 of the encoder 4 so that the rotation of the rotating shaft 3 of the electric motor 1 is reduced. Encoder 4 via gears 12 and 13
It is transmitted to. The gear ratio between the gears 12 and 13 is set to 1: 1. Therefore,
The number of rotations of the rotating shaft 3 of the electric motor 1 and the rotating shaft 7 of the encoder 4
, And the number of pulses detected by the encoder 4 becomes the rotation speed of the electric motor 1 as it is. Therefore, it is not necessary to perform a special correction in the signal processing of the encoder 4.

In this embodiment, even if the rotating shaft 3 of the electric motor 1 moves in the vertical direction, the rotating shaft 7 of the encoder 4 is not directly connected to the rotating shaft 3 of the electric motor 1, so that the gear 12 is , And the rotation axis 7 is not directly affected. Furthermore, the rotating shaft 3
The gear 12 remains in gear 1
In FIG. 1, the thickness of the gear 12 is made larger than the thickness of the gear 13 so that the gear 13 is not easily separated from the gear 3.
In FIG. 1, reference numeral 14 denotes an insertion hole for the rotary shaft 3 formed in the end cover 1a, and reference numeral 15 denotes a bearing for rotatably supporting the rotary shaft 3 on the end cover 1a. In FIG. 2, reference numerals 16, 17, and 18 denote power supply terminals of the electric motor 1.

In the above embodiment, an electric motor in a forklift is taken as an example. However, the present invention is not limited to this, and can be applied to an electric motor having a brake device in general.

[0021]

According to the present invention, the mounting structure of the encoder is simplified, and the entire height between the brake device and the electric motor can be effectively used to reduce the overall height. In addition, the encoder is not directly affected by the vertical movement of the motor rotating shaft, and the reliability is improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a motor encoder mounting device according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a front view of a conventional motor encoder mounting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 1a End cover 2 Disk 3 Rotary shaft 4 Encoder 9 Notch 12 Gear 13 Gear

Claims (4)

[Claims] An electric motor having a brake device provided at an end of a rotary shaft, and an encoder for detecting the number of revolutions of the electric motor, wherein the encoder is attached to an end cover of the electric motor to connect the brake device to the electric motor. An encoder mounting device for an electric motor, wherein the encoder mounting device is disposed between the encoders. 2. The motor encoder mounting device according to claim 1, wherein a notch is provided in the end cover of the motor, and the encoder is located in the notch. 3. The motor encoder mounting device according to claim 2, wherein the notch is formed so as to open to the side of the end cover. 4. A first gear is provided on a rotating shaft of an electric motor, and a second gear meshing with the first gear is provided on a rotating shaft of an encoder, and a gear ratio between the first gear and the second gear is provided. The encoder mounting device for an electric motor according to claim 1, wherein 1 is set to 1: 1.