JPH028535Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to electric vehicles and can be applied to electric wheelchairs, electric golf carts, etc.

(B) Prior Art Generally, an electric vehicle rotates a motor using a battery power source mounted on the electric vehicle body, and uses the rotational force to drive drive wheels attached to the electric vehicle body.

BACKGROUND ART In an electric vehicle, for example, an electric wheelchair, a motor is provided between a pair of rear driving wheels, and a device for detecting the rotational speed of the motor or the rear driving wheel is provided in order to adjust the rotational speed of the driving rear wheel to a set value. Additionally, an electromagnetic brake device is provided to stop the rotation of the rear wheel. A conventional device having such a rotational speed detection device and an electromagnetic brake device will be explained with reference to FIG. As described above, the axial end face of the motor case 41 installed between the pair of rear driving wheels includes an annular wall 43 formed to protrude in the axial direction from the motor bracket 42, and a brake support plate 44 attached to the tip of this annular wall. Accordingly,
One room 45 is formed. A rotary disk 47 for detecting the number of rotations is firmly attached to the motor shaft 46 that protrudes into this one room, and a brake disk 48 is attached so that it does not move in the circumferential direction but only slightly moves in the axial direction relative to the motor shaft 46. It will be done.

On the other hand, on the fixed side of the chamber 45, a photodetection type rotation speed detector 49 and an electromagnetic brake means 50 are attached to a mounting base 51 or a support plate 44. The rotational speed detector 49 is provided opposite the rotating disk 47 and has a light source that emits light and a light receiving element that receives reflected light from the rotating disk 47. As shown in FIG. 2, the rotating disk 47 has a reflective protrusion A that reflects light from a light source around it and a notch B that passes this light. This detects the rotational speed of the motor. Based on this detection output, the amount of power supplied to the motor is controlled to adjust the rotational speed of the motor to a set value.

Next, the electromagnetic brake means 50 performs a braking action by friction between it and the brake disc 48, and is constructed by mounting a brake coil 53 and a brake shoe 54 in a central hole 52 of the brake support plate 44. To stop the rotation of the wheels after driving, the brake coil 53 is energized by operating the operating lever of the electric wheelchair, and its electromagnetic force moves the brake disc 48 and presses it against the brake shoe 54.The friction force causes the motor shaft 46 to move. Rotation stops.

In such a conventional device, since the rotational speed detection device and the electromagnetic brake device are provided in one chamber provided on the axial end face of the motor case, it is possible to achieve miniaturization, but there are the following drawbacks. That is, the light receiving element of the rotation speed detector 49 detects the reflected light from the reflective protrusion A of the rotating disk 47, but the light receiving element detects the reflected light from the reflective protrusion A of the rotating disk 47,
Since the light that has passed through the brake disk 48 is reflected by the brake disc 48, this reflected light is also detected, and there is a risk of false detection.Especially depending on the setting of the detection level value of the light detection pulse, false detection may occur. Become. In addition, for miniaturization, an electromagnetic brake device is installed in the same room together with a rotational speed detection device.
The sliding contact of 8 generates abrasion powder, and this abrasion powder adheres to the rotation speed detector 49, thereby impairing the function of the detector.

(c) Purpose of the invention The present invention has been devised in view of the above points, and eliminates the drawbacks of the conventional device, such as the erroneous detection of the photodetection type rotation speed detector, without sacrificing the advantage of the conventional device, which is miniaturization. The purpose of this invention is to reduce the risk of damage to the electromagnetic brake device and to reduce the influence of abrasion powder on the electromagnetic brake device.

(d) Structure of the invention In order to achieve the above object, the electric vehicle according to the present invention has a chamber formed in the axial end face of a rotating machine box such as a drive motor or its reduction gear attached to the electric vehicle body, and An electromagnetic brake that has a rotating plate for detecting rotational speed and a brake disk attached to a rotating shaft in the room, and performs a braking action by friction between a photodetection type rotational speed detector that opposes the rotating plate and the brake disk. The electric vehicle is characterized in that a dividing plate is provided between the rotary plate and the brake disk for dividing the one chamber into two parts.

(e) Embodiment An embodiment in which the present invention is applied to an electric wheelchair will be described below based on the drawings. FIG. 3 is a perspective view of the electric wheelchair. In this drawing, the electric wheelchair consists of a wheelchair main body 2 supported mainly by a metal pipe 1. A seat 3 is provided in the center of this main body, and armrests 4, 4' are provided on both left and right sides of the main body. are the front wheels 5, 5 and the driving rear wheel 6, respectively.
is installed. Between this pair of rear wheels,
A pair of drive motors and a drive control section 7 for an electromagnetic brake device are attached, and power batteries 8, 8 are mounted at the bottom of the seat 3.

Further, the operation box 9 installed near the armrest 4 is attached to an inverted L-shaped support metal fitting 10, and this support metal fitting 10 is attached to a pivot pipe 11 provided on the metal pipe 1 so that the operation box 9 can swing in a horizontal plane.
and is fixed with a tightening screw 12 so as not to swing. The operation box 9 has a shift lever 13 on its upper surface, and the wheelchair is moved and stopped by operating the shift lever 13.

Next, FIG. 4 is a sectional view of a main part of a motor case corresponding to one driven rear wheel 6 in the drive control section 7. As shown in FIG. In this drawing, a motor case 14 has an annular wall 16 on the axial end surface of a bracket 15, and a chamber 18 is formed by this annular wall 16 and a brake support plate 17 attached to the tip thereof. . A rotary disc 20 for detecting the number of revolutions is firmly attached to the motor shaft 19 that protrudes into this one room, and a brake disc 21 is mounted on the motor shaft 19.
On the other hand, it is mounted so that it does not move in the circumferential direction and only slightly moves in the axial direction.

On the fixed side of the chamber 18, a photo-detection type rotation speed detector 22 and an electromagnetic brake means 23 are attached to a mounting base 24 or a support plate 17. The detector 22 is mounted opposite the rotating disk 20 and has a light source that emits light and a light receiving element that receives reflected light from the rotating disk 20. The rotating disk 20 has a reflective protrusion A and a notch B as shown in FIG. The electromagnetic brake means 23 performs a braking action by friction between it and the brake disc 21, and includes a brake coil 26 and a brake shoe 27 installed in a central hole 25 of the brake support plate 17. A rotational speed detection device 28 consisting of the above rotating disk 20 and detector 22, and an electromagnetic brake device 29 consisting of the brake disk 21 and electromagnetic brake means 23.
is the same as the conventional device shown in FIG.

Reference numeral 30 denotes a dividing plate which is a feature of the present invention and divides one chamber 18 into a chamber 18' for the rotational speed detection device 28 and a chamber 18'' for the electromagnetic brake device 29, and is provided on the bracket 15. Screw 3 to boss part 31
2. Room 1 of this division board 30
The inner surface on the 8' side is a light absorption surface so that at least the light irradiated by the light source of the rotation speed detector 22 and passed through the notch B of the rotary disk 20 is not reflected. A front view of the dividing plate 30 is shown in FIG. Although the central hole 33 of the partition plate 30 allows the motor shaft 19 to pass through, it is preferable that the gap between the partition plate 30 and the motor shaft be as small as possible to prevent wear powder generated from the electromagnetic brake device 29 from passing through. . In the example, one chamber was formed at the axial end of the motor case, but
When a gear case is used, it may be provided in the gear case. That is, this chamber may be formed in a rotating machine box such as a motor case or a gear case.

(f) Effects of the invention As described above, the electric vehicle according to the invention has a chamber formed on the axial end surface of a rotating machine box such as a drive motor or its reduction gear attached to the electric vehicle body, and a rotating shaft inside this chamber. A rotary plate and a brake disk for detecting the rotational speed are attached, and a photodetection type rotational speed detector that opposes the rotary plate and an electromagnetic brake means that performs a braking action by friction between the rotary plate and the brake disk are provided. The electric vehicle is characterized in that a dividing plate is provided between the rotary plate and the brake disk to divide the one room into two parts, so the existence of the dividing plate makes it possible to The light irradiated from the detector is no longer reflected by the brake disc, which reduces false detection by the detector, and brake abrasion powder generated between the brake disc and the electromagnetic brake means is removed from the detector or the brake disc. This has great practical effects, such as less adhesion to the rotating disk and fewer erroneous detections due to abrasion powder compared to conventional devices.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the motor case of a conventional device, Figure 2 is a front view of the rotating disk, and Figures 3 to 5.
The drawings show an embodiment of the present invention, in which Fig. 3 is a perspective view of an electric wheelchair, Fig. 4 is a sectional view of a main part of a motor case, and Fig. 5 is a front view of a dividing plate. 2... Electric vehicle body (wheelchair body), 14... Rotating machine box (motor case), 18... One room,
19... Rotating shaft (motor shaft), 20... Rotating disk,
21...brake disk, 22...rotation speed detector, 23...electromagnetic brake means, 30...dividing plate.

Claims (1)

[Scope of utility model registration request] A chamber is formed on the axial end face of a rotating machine box such as a drive motor or its reduction gear that is attached to the electric vehicle body, and a rotary plate for rotation speed detection and a brake disk are attached to the rotating shaft in this chamber, and the An electric vehicle is provided with a photo-detection type rotational speed detector that opposes the rotating plate, and an electromagnetic brake means that performs a braking action by friction between the rotating plate and the brake disc, the electric vehicle having a light detection type rotation speed detector that opposes the rotating plate, and an electromagnetic brake means that performs a braking action by friction between the rotating plate and the brake disc. An electric vehicle characterized in that the electric vehicle is provided with a dividing plate that divides the one room into two parts.