JPH01132015A - Rotary setting device - Google Patents

Abstract

PURPOSE:To prevent occurrence of a shortcircuit accident by a method where water is not allowed to penetrate into a circuit board even if penetrates into the title rotary setting device. CONSTITUTION:A shaft supporting part 19 of an operating box 2 to support an operating shaft 20 of an operating knob is formed to be a cylinder and positioned under a circuit board 23 installed on the inner surface of a top wall 13 of the operating box. If flowing water attached on the outer surface of the top wall 13 of the operating box 2 penetrates through the gap between the operating shaft 20 and the shaft support part 19, the water goes along the top surface an operating body 22 without going toward the circuit board positioned above the operating body 22. Occurrence of a shortcircuit accident at an electric part can thus be prevented even if water penetrates, thereby safety of electric equipment can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a rotary setting device used in electrical equipment used outdoors and other places where there is a risk of getting wet, and specifically relates to a rotary setting device used in electric equipment such as golf carts, etc. Used in outdoor vehicles, washing machines, juice mixers, and other electrical equipment that uses water.

Prior art As a technology prior to the present invention, Utility Model Application No. 58-147120
There is one in which a waterproof gasket is interposed between the periphery of the operating shaft and the upper wall, as in Japanese Patent Application No. A waterproof gasket is used to prevent water from entering the operation box, but as the number of parts increases, if the waterproof gasket is forgotten during assembly, water may adhere to the circuit board and cause short circuits. do.

Furthermore, there is a device as disclosed in Japanese Utility Model Application Laid-Open No. 60-19131 in which a lid is interposed between a substrate on which a magnetic sensing element is arranged and an operating body to prevent water from entering the substrate. By partitioning the interior of the operation box with the lid, the structure inside the operation box becomes complicated and wiring assembly work cannot be carried out efficiently.

(c) Problems to be Solved by the Invention The present invention provides a rotary setting device that prevents water from entering the circuit board even if water enters the rotary setting device.

(d) Means for Solving the Problems The present invention comprises an operating shaft having a rotary operating knob formed at its upper end, a circuit board having a setting section formed thereon, and an operating box body having the circuit board mounted on the inner surface of the upper wall. A rotary motor is connected to a shaft support of an operation shaft formed in a cylindrical shape on the upper wall of the operation box body so that the lower end is located below the circuit board, and an operation body of a setting part formed at the lower end of the operation shaft that protrudes from the shaft support. The problem is solved by means of forming a setting device.

The setting section is formed by a plurality of magnetic sensing elements, and the magnetic sensing elements include a reed switch that is turned on by bringing a magnetic body close to it. When the setting part is formed of a magnetically sensitive element, a magnetic body is formed on the operating body so as to face the circuit board, and the magnetic body may be formed on the upper surface of the outer circumference of the disk, or on the tip of the rod. It may be formed into

When the setting part is formed by a fixed contact or a variable resistor of a switch formed on a circuit board and a movable contact or a sliding contact of the switch, the structure shall be such that the movable contact or sliding contact can be moved by the operating body. be able to.

(E) Function The present invention has a cylindrical shaft portion of the operation box body that pivotally supports the operating shaft of the rotary operation knob, and the lower end of the shaft portion is located below the circuit board mounted on the inner surface of the upper wall of the operation box body. By locating
Even if water adhering to the outer surface of the upper wall of the operation box enters through the gap between the operation shaft and the shaft support, the water will flow on the upper surface of the operation body and flow toward the circuit board located on the upper blade of the operation body. I can't.

(F) Embodiment The present invention will be explained using the illustrated golf cart 1 as a specific example.

3 is a circuit diagram of the golf cart 1, FIG. 2 is a perspective view of the golf cart 1, FIG. 1 is a sectional view of the operation box 2 of the golf cart 1, and FIG. 4 is a plan view of the operation box 2. 5th r5! :J
8 are waveform diagrams illustrating the control of the wheel drive motor M by the variable speed operation section 3. In FIG.

The golf cart 1 has a main body frame 4 formed by combining and connecting pipe bodies, and a wheel drive motor M, a storage battery B, a control unit CT, etc. are attached to the lower part of the main body frame 4, and each part is connected to the main body by a main body cover 5. It's covered in a fall-like manner. Control unit CT
is the circuit portion on the right side divided by the dotted chain line from the center in FIG.

A drive wheel 6 is pivotally supported at the rear lower part of the main body frame 4, and the drive wheel 6 is driven by a motor M.A steering wheel 7 is supported at the front lower part of the main body frame 4. A golf bag mounting part 8 is formed at the lower part, and a golf bag support 9 is formed at the front upper part of the main body frame 4.The rear upper part of the main body frame 4 is a handle 10, and the center of the handle 10 has an operation button. Box body 2 is attached. A brake lever 11 is formed on the handle lO. By pulling the brake lever 11 to the handle 10, the wire 12
A mechanical brake (not shown) can be fully operated via the brake to prevent the drive wheels 6 from rotating. The brake switch SW2 is also operated in conjunction with the operation of the brake lever 11, and when the brake lever 11 is pulled toward the handlebar 10 to apply the brake, the brake switch SW2 is released. In the operation box body 2, a circuit portion on the left side of the center-dot chain line in FIG.

The operation box body 2 consists of an upper wall 13 molded from synthetic resin, and a sheath portion 14 formed from sheet metal and having a top opening closed by the upper wall 13. A hanging rib 15 is formed around the upper wall 13,
A hanging rib 15 covers the outer side of the upper edge of the sheath portion 14, and the two are connected by a screw 16. At the center of the upper wall 13, a shaft support 19 is formed by a cylindrical portion 17, 18 that continuously projects from the outer and inner surfaces of the upper wall 13. An operating shaft 20 is inserted through and supported by the shaft support 19 . A rotary operating knob 21 is fixed to the upper end of the operating shaft 20 that protrudes from the cylindrical portion 17, and an operating body 22 is fixed to the lower end that protrudes from the cylindrical portion 18. Upper wall 13
A circuit board 23 is mounted above the lower end of the inner cylindrical portion 18, that is, the lower end of the shaft support 19. The circuit board 23 has a main switch S on the speed variable operation section side RM shown in FIG.
The parts except WI and brake switch SW2 are wired to the device. The main switch SWI is attached to the sheath 14 so that its operating section is exposed. So, S2
, S3.

S4, Ss, Ss, S7, and Se are reed switches, which constitute a setting section for stopping and controlling the speed of the motor M, and are magnetic sensing elements that are turned on when a magnetic body approaches or separates. Reed switches So, S2...So has a resistor R+ connected in series.
, R2, R3, R4, R5, R6, and R7 are connected.

The operating body 22 is an operating plate 24 formed of a synthetic resin disc body.
and a magnetic body 25 attached to the upper surface of the outer periphery of the operation plate 24. A plurality of recesses 27 are formed on the ox side of the operation plate 24, into which engagement bodies 26 that hold the operation plate 24 in an appropriate rotational position are engaged. The engaging body 26 is biased by a spring '28 and is housed in a housing section 29 of the upper wall 13. In this structure, nine recesses 27 are formed. The holding position of the operation plate 24 by the engaging body 26 is such that the magnetic body 25 is the reed switch So, S2...S.
Position corresponding to o and reed switch S. This is the position corresponding to the virtual switch S+ between S2 and S2. Further, a pointer 9 portion 30 is formed on the rotary operation knob 21, and the operation plate 24 is formed with a pointer 9 portion 30.
A display board 31 is mounted on the upper surface of the upper wall 13 to indicate each holding position and to indicate the set state using a pointer section 30. As shown in FIG. 4, the display board 31 is provided with displays indicating nine set positions and text indicating the status of the motor M.

In the display plate 31, the cylindrical portion 17 has an insertion hole in the center, and the rotary operation knob 21 covers the cylindrical portion 17.

The golf cart 1 is used outdoors, and when it is used in the rain, the operation box body 2 gets wet with water, but the water falling on the upper wall 13 flows down without entering the sheath part 14 from the surroundings. Since the operating shaft 20 is pivotally supported by the cylindrical portion 17, water cannot rise up the cylindrical portion 17, and water is prevented from entering from the shaft support 19.

Water rises in the cylindrical part 17 due to the wind, and the operating shaft 20 and the shaft support 19
When water infiltrates into the sheath portion 14 through the gap between the sheath portion 14 and the sheath portion 14, the infiltrated water flows over the upper surface of the operating body 22 and flows downward.

As a result, water that has entered does not reach the circuit board 23 located above the operating body 22, and electrical insulation is maintained well.

Note that no electrical parts are installed in the whistle part 14 located below the operating body 22, and the main switch SW- is naturally installed in the upper part of the whistle part 14. A drainage hole is formed to drain water.

A lead wire 32 connecting the circuit board 23 to the control unit CT is wired inside the handle 10. The lead wires 32 are in addition to the six wires crossed by the dashed line in Figure 3 and the seven ground wires.
Although not shown in the circuit of FIG. 3, there is one wire for a battery checker shown in FIG. 4.

The electric circuit of the golf cart 1 includes a resistor, a capacitor, a diode, a transistor, a comparator, a relay, an EXCLUSIVE OR circuit, and a motor M, as shown in FIG.

The armature M2 of the motor M has current limiting resistors R21 and R2.
2 are connected in series, and the resistor R21 is the relay contact R-82 which is turned on by the relay coil RM2 of the starting compensation relay.
Short-circuit control can be performed with . The armature M2 and the storage battery B are connected through a relay contact R8, which is connected by a relay fill RMI of the main relay. A diode DKI is connected in parallel to the shunt coil Ml of the motor M, and a t-flow side dual-purpose transistor T3 is connected in series to the shunt coil M1. A diode D is connected to the base terminal of the transistor T3. +D6, De parallel circuit can be connected. Diode D8 is connected to the output of comparator C0PI, and diode De is connected to the output of comparator COPλ. Diode D is connected to relay fill RM via diode Da.
It is connected to the collector terminal of the transistor T2 which controls the transistor T2. Resistors Rm and R are connected to the base terminal of the transistor T2.
+s and a delay circuit consisting of capacitor C2 are connected. The delay circuit is a photocoupler FS and a brake switch SW.
2 and the storage battery B via the main switch SWI. The relay coil RM+ of the main relay and the light emitting element of the photocoupler FS are connected in parallel and connected to the collector terminal of the stall control transistor TI. Resistors Re, R++, RIo and resistors R1...R7 of the speed variable operation section 3 are connected to the base terminal of the transistor TI. Resistors R9 and R+ are stabilizing resistor Re and Zener diode Z
D+ is connected to the storage battery B via the main switch SW+.

The connection between the resistors R9 and R1 is connected to the base terminal of the transistor T1 and to the + input of the comparator COP+. The +input voltage v1 of the comparator COP+ is changed by the operation of the speed variable operation section 3. The + input of comparator C0P2 is connected between armature M2 and resistor R22, and resistor R2
2 voltage v3 is input. Comparators C0PI and C0P2
The output from the triangular wave generator A2 is connected to the resistor RI3.
A partial pressure is applied at Rljk and Rljk. Comparator COP+
The single force tolerance v2 is the single force 'IE E of the comparator C0Pz.
It can be set higher than EV4.

The abnormality detection section A1 is formed by connecting two EXCLUSIVE OR circuits, and its output terminal e is connected via a resistor R23 to the base terminal of a transistor T which controls the alarm generator SP. The input is a resistor R, R25, R
By connecting to i@, R271R2111R29,
Input terminal a is connected from brake switch SW2 to control unit C.
The input terminal d is connected between the relay coil RM I and the transistor T1, and the input terminal d is connected to the movable contact of the relay contact R3+ when it disconnects from the armature M2.

Next, the operation of the motor M will be explained.

Switches SW + , SW2, relay contacts RS + , RS2, reed switches So, S shown in Fig. 3
2... In the state of S8, the main switch SWI of the golf cart 1 is turned off, the brakes are applied and the wheels are fixed, and the speed variable operation section 3 is turned off. Therefore, reed switch S. is turned on, and the storage battery B is connected to the input terminal d of the abnormality detection section A1.

Next, main switch SWI and brake switch SW2
When the reed switch S0 is turned on, the transistor T1 maintains non-conduction, and the relay contact R
Both 81 and R32 will maintain their current status.

When the rotary operation knob 21 is rotated and the -C- scale is rotated, the magnetic body 25 is shifted from the reed switch S0 to the virtual reed switch S1 position, and the reed switch S0 is set to O.
Becomes FF. Then, transistor T1 becomes conductive, relay coil RM+ is energized, and relay contact R8+ is connected to armature M2. At this time, the transistor T2 is non-conductive for the charging time of the capacitor C2, and then the relay coil R
Mz4m is energized and relay contact R8a is closed. At this time, the +input voltage v1 of the comparator COP+ is greater than the one input terminal Vλ as shown in Fig. 5, and the diode Da is at a high level, and the transistor ECO is always conductive (duty is 100%).
), and the motor M rotates at the lowest speed. However, until the transistor T2 becomes conductive, the motor M is started by the series circuit of the m resistor Rat and R22, and the starting torque increases, which means that the motor starts slowly and also starts reliably even on an uphill slope. can. Furthermore, since the diode D7 remains at a high level until the transistor T2 becomes conductive, the duty of the transistor T3 becomes 100% regardless of the levels of the diodes Ds and D*.
When the brake is applied and the vehicle is stopped, press the reed switch S2.
When the brake is released by selecting .S., the transistor T3 is always conducted with a duty of 100% until the transistor T2 becomes conductive, so that a start with good starting performance and no sudden start can be performed. By sequentially switching from reed switch S2 to So, +input voltage v1
becomes smaller, and the reed switch S2 shown in Fig. 6 is turned on.
In this state, the high level time of the output of the diode Da becomes a little shorter, and the duty of the transistor T3 is 80%.
The motor M is operated at low speed. Further, when the reed switch S is turned on, the output of the diode D is as shown in FIG. 7, and the duty of the transistor T3 is about 20%, allowing the motor M to operate at the maximum speed.

However, the faster the motor M rotates, the smaller the torque becomes.

Therefore, FIG. 8 shows the situation when traveling uphill at maximum speed. When going uphill, a large torque is required, but since the maximum speed is set, the torque is small and the load on the motor M increases, causing the rotational speed to decrease. When the rotation speed decreases, the current in armature M2 increases, and comparator C
Since +input voltage 3 of 0P2 increases, it overlaps with one input terminal v4, an output is generated from diode D11, the high level time becomes longer, and the duty of transistor T3 becomes about 60%, so transistor T3
is controlled by a diode ps, and the rotational speed of the motor M changes to the low speed side, increasing the torque and making it possible to run uphill smoothly.

While the golf cart 1 is in use, the rotary operation knob 21
If the reed switch S0 does not turn on even when the switch is in the 1 off position, or the connection line L to the base terminal of the transistor TI
If a disconnection occurs in the + or ground wire L2, the state will be the same as when the virtual reed switch SI is set, so the golf cart 1 can continue traveling at the lowest speed. As a result, the golf cart 1 can be moved to a repairable point, a safe place, or a repair requestable point without abandoning the golf cart 1 on the way, and the golf cart 1 can be continued without abandoning. Stopping in this state can be achieved by operating the brake lever 11.

When the golf cart 1 is running, the abnormality detection unit A1 has the transistor T1 ON, so that the input terminals S and d are at a low level, and the input terminal a is at a high level, so the output terminal C is at a low level. The level becomes high, transistor T4 is OFF, generator SP does not sound, and main switch SW1 or brake switch SW2 is OFF.
When F is reached, input terminals n and b become low level, and input terminal d becomes high level, so output terminal e becomes high level, generator SP does not sound, and main switch S
When W + and brake switch SWz are ON and reed switch S0 is ON, input terminals a, b, and d are at high level, output terminal e is at high level, and generator SP does not sound. Therefore, golf cart 1 is normal. In this condition, the generator SP will not sound.

Furthermore, even if the relay contact R8+ is welded while connected to the armature M2, the speed variable operation unit 3 will set the reed switch S0, that is, a state other than "off", and the main switch SW+'b brake switch SW2 will also be set. In a running state where the engine cannot be operated properly, the generator SP does not sound because it operates in the same way as in a normal state.

Next, when relay contact R9+ is connected to armature M2 and welded, main switch SW1 is turned OFF.
Or operate the brake lever 11 and switch the brake switch SW.
When the reed switch S0 is turned OFF or the rotary operation knob 21 is operated to turn the reed switch S0 ON, the generator SP sounds. That is, when each of the above-mentioned operations is performed, the input changes at the input terminals a and b of the abnormality detection section A1 are unchanged from the normal state, and the main switch SWI or the brake switch SW
When z is turned off, it becomes a low level, and when reed switch S0 is turned on, it becomes a high level, so that the intermediate output terminal C is always at a low level. On the other hand, since the relay contact R5+ is welded, the input terminal d is always at a low level, so the output terminal e is at a low level, the transistor T is turned on, and the generator SP sounds.

If one or more of the three operations mentioned above are terminated with contact welding occurring, the shunt filter M1 will not be energized because the transistor T3 will be turned off, but the current will be energized to the transistor M2 and the resistors R21 and R22. As a result, the motor M cannot run with zero torque and stops. If this state continues, Hiroiso Sen M2 will resist.

R21 and R22 generate abnormal heat and may cause a fire.

In particular, in the case of Golf Cart 1, the resistor R21 that intervenes in order to obtain sufficient starting torque at startup and to start slowly without suddenly starting is a nichrome resistor due to ease of assembly, cost, and design considerations, so it is exactly red hot. The generator SP is only activated when this situation occurs.
This sounds to notify you of an abnormality.

It should be noted that the above-mentioned structure shows a structure considered to be optimal for the present golf cart in carrying out the present invention, and the present invention is not limited to this structure and can be implemented with various modifications.

(G) Effects of the Invention The present invention prevents accidents such as short-circuiting of electrical parts even if water enters by arranging the circuit board above the cylindrical shaft support, thereby improving the safety of electrical equipment. can be improved.

[Brief explanation of the drawing]

The drawings show the present invention, and show the structure used in a golf cart. Fig. 1 is a sectional view of the operation box, Fig. 2 is a perspective view, Fig. 3 is an electric circuit diagram, Fig. 4 is a plan view of the same, and Fig. 4 is a plan view of the same. 5 to 8 are waveform diagrams showing the operation. 1...Golf cart (movement vehicle), 2...Operation box body,
3...Speed variable operation section, CT...control section, RM...
・Speed variable operation unit side, M...Motor, A1...Abnormality detection unit, HSP...Generation unit, SW,...Main switch, SW2...Brake switch, SO, S2...
・S... Reed switch (setting part), 19... Shaft support, 20... Operating shaft, 21... Rotary operating knob, 22... Operating body, 24... Operating board, 25 ...Magnetic material.

Claims (1)

[Scope of Claims] 1. An operating shaft with a rotary operating knob formed on the upper end, a circuit board with a setting section formed thereon, an operation box body with the circuit board mounted on the inner surface of the upper wall, and a lower end below the circuit board. A rotary setting device consisting of a shaft support of an operation shaft formed in a cylindrical shape on the upper wall of an operation box so as to be located at the shaft support, and an operation body of a setting part formed at a lower end of the operation shaft protruding from the shaft support. 2. The rotary setting device according to claim 1, wherein the setting section is formed of a plurality of magnetic sensing elements, and the operating body is formed by attaching a magnetic body to an operating plate formed in a disk shape.