JPS6328730A - Starting device for vehicle - Google Patents

Abstract

PURPOSE:To ensure the safe start of an engine by providing a starter motor with a start restriction circuit whereby a starter can be started with a drive power transmission system interrupted, a PTO clutch disengaged and the non- operation of a governor for a governor clutch. CONSTITUTION:When a main transmission 50 is at a neutral position or a clutch 48 is disengaged, driving power transmission is turned off and the cathode of a thyristor 142 is earthed. When a transistor 166 is OFF with a kill switch 160, a governor switch 162 and a PTO switch 172 all open, the thyristor 142 turns ON and a start limit relay 138 closes. Therefore, a starter motor 128 is started with a starter circuit 136 closed. When a neutral switch 146 and a clutch switch 152 has been turned OFF, the thyristor 142 is not grounded and the start of the starter motor 128 is prohibited.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a starting method applied to a vehicle equipped with a governor for constant speed operation of a carrot, a starter motor for the carrot, and a PTO output extraction circuit. It is related to the device.

(Background of the Invention) While the output of the engine is transmitted to the driving wheels via the traveling transmission system, the output of this engine cannot also be transmitted to the PTO shaft. A work vehicle that can be driven quickly has been proposed (
For example, Japanese Patent Application No. 61-31905, etc.).

The governor operates by, for example, opening the throttle valve of the carburetor to speed up the engine when the engine is running at low speed, and it also functions to open the throttle valve to near full open when the engine is stopped. be. Therefore, if you start the engine with the governor still in operable condition,
Engine speed temporarily increases. Therefore, if the traveling transmission system is in the connected state at this time, the vehicle and the work vehicle connected to it will start suddenly, and if the PTO clutch, which connects and disconnects the PTO shaft and the engine, is in the connected state, the
The TO axis will suddenly start rotating. For this reason, there is a problem in that a work vehicle that is towed or driven by a PTO shaft may be damaged.

(Objective of the Invention) The present invention was made in view of the above circumstances, and is intended to prevent the engine from temporarily increasing speed when starting the engine due to the operation of the cabana, and to prevent the risk of damaging the connected work vehicle. The purpose of this invention is to provide a starting device for a vehicle that does not require a vehicle.

(Structure of the Invention) According to the present invention, the object is to provide: a disconnecting means for disconnecting and disconnecting a travel transmission system that transmits the output of the engine to the drive wheels; a PTO crunch that disconnects and disconnects the transmission of the engine output to the PTO shaft; In a vehicle that includes a governor that controls engine speed to a set speed or less, a governor clutch that selects activation/deactivation of the governor, and a starter motor for the engine, the starter motor has the travel transmission system in a disconnected state. This is achieved by a starting device for a vehicle, characterized in that a starting control circuit is connected that enables the starter motor to be started when the PTO clutch is in a disengaged state and the governor clutch is in an inoperative state.

(Example) Figure 1 is a circuit diagram of an embodiment of the present invention, Figure 2 is its logic circuit diagram, Figure 3 is a side view of a vehicle equipped with this engine, and Figure 4 is its power system. This is an overall development diagram.

In FIG. 3, reference numeral 10 indicates a vehicle body frame, including a pair of left and right lower tubes 12, a main tube 14, and a front tube 1.
6. It has a seat rail 18 and the like. 20 is a pair of left and right steering front wheels, 22 is a pair of left and right driving rear wheels, and wide ultra-low pressure tires (so-called balloon tires) are mounted on these. 24 is a steering handlebar located above between the front wheels 20, 26 is a fuel tank located at the upper part of the vehicle body behind it, and 28 is a straddle type driver seat. 30 again
32 is a front fender, and 32 is a rear fender.

34 is a forced air-cooled overhead camshaft single-cylinder engine. As shown in FIG.
2, a retreat shaft 44 and an output shaft 46 are provided. A manual clutch 48 is provided at the right end of the main shaft 38, and a group of floats forming a foot-operated forward main transmission 50 are provided on the main shaft 38 and the counter shaft 40. This main transmission 50 is in neutral position N(
(see Figure 4) can be selected. The output shaft 46 is provided with a dog clutch-type forward/reverse switching clutch 52 for both forward/reverse and high/low speed switching.This clutch 52 has no neutral position and is manually switched by a switching lever 54.

That is, when the switching lever 54 is set to the forward low speed position (L), the rotation of the crankshaft 36 is controlled by the clutch 48, the main shaft 38,
It is transmitted to the output shaft 46 via the main shift fi50, the intermediate float 56 on the intermediate shaft 42, and the low speed gear 52a, resulting in low speed running. Further, when the switching lever 54 is set to the forward high speed position (H), the rotational speed is transmitted to the output shaft 46 via the intermediate Fi1 gear 56 and the high speed gear 52b. moreover! When the ilJ conversion lever 54 is set to the reverse position (R), the rotation of the crankshaft 36 is transmitted to the output shaft 46 via the clutch 48, the main shaft 38, a gear integrated with the reverse shaft 44, and the reverse float 52c.

The cylinders of the engine 34 are covered with a cowling and are forcibly air-cooled by a fan 58 that is rotationally driven by the crankshaft 36.

Reference numeral 60 denotes a rear axle, and a differential case 64 is integrally attached to the rear axle 60, which is offset to the right and accommodates a differential device 62. The rear axle 60 has left and right drive shafts 66 (
66a, 66b) are inserted therethrough, and each rear wheel 22 is fixed to the protruding end of each drive shaft 66. The differential gear 62 is set to a position (LOCK) in which the differential gear 62 is locked and both rear wheels 22 are driven at the same speed by a manual switching lever 68, each time the differential gear 62 is activated (DIFF). It is possible to switch to

The rear axle 60 has two lower arms 7 as shown in FIG.
It is connected to the frame 10 by A-shaped amperes 1172 that are movable downwardly. That is, the front end of the lower arm 70 is connected to a cross tube 74 that connects the left and right lower tubes 12. In addition, the rear end of the A-shaped upper arm 72 is connected to the differential case 6.
The two front ends, which are the legs of the A-shape, are connected to another cross tube 76.

78 is a buffer unit that supports the rear wheel 22.

In Fig. 3.4, 80 is a carburetor, which includes a piston-type throttle valve 84 that is opened and closed by a throttle lever 82 provided on the steering handle par 24, and a butterfly-type throttle valve 86 for the governor located downstream of the piston-type throttle valve 84. Equipped with. Throttle valve 8 for governor
6 is connected to a centrifugal governor 94 provided on an overhead camshaft 92 via a governor clutch 90 that is turned on and off by a governor on/off lever 88. In addition, 96 in FIG. 3 is an intake air purifier.

98 is an auxiliary speed reducer. The sub-reducer 98 is formed separately from the engine 34 and the rear axle 60, and is located between the engine 34 and the rear axle 60 on the frame 10.
is rigidly fixed to.

A gear group 102 including a cylindrical cam type damper 100 is housed in the sub-reduction fi 98, and the output shaft 4 of the engine 34 is
6 is transmitted to this gear group 102 via chain 104i. The output shaft 1060 rotations of the sub-reducer 98 is connected to the input shaft 110 of the differential case 64 through a horizontal drive shaft 108 . Note that both ends of the drive shaft 108 are connected by a universal joint, allowing the rear axle 60 to move up and down.

Reference numeral 112 denotes a PTO @ car box, which is fixed to the car body frame IO. A bevel gear 114 is housed in this gear box 112. The engine 34 includes a PTO drive shaft 116.
A crankshaft 3 is provided on this PTO drive shaft 116.
6 is transmitted via the clutch 48 and the intermediate gear 118. This rotation of the PTO drive shaft 116 is transmitted to the bevel gear 114 via a belt-type PTO clutch 120, and further transmitted to the PTO shaft 122.

124 is a PTO switching lever, and PTO clutch 12
Intermittent 0. In other words, move this lever 124 to the connected position (
When set to ON), the idler 126 of the clutch 120 is pressed by the belt and can transmit rotation, and is set to the cutoff position (OF).
If F) is selected, the pressing force of the idler 126 will be reduced and the rotation transmission will be cut off.

128 is a starter motor, and this starter motor 1
The rotation of 28 is transmitted to the crankshaft 36 via a one-way clutch 130 (FIG. 3).

In FIG. 1, 132 is a starter relay, and a normally open contact 132a of this relay 132 is connected to the starter motor 128.
and the battery 134 to form a closed circuit. 136 is a starter switch, one end of which is connected to the ten poles of the battery 134, and the other end connected to the battery via the normally open contact 138a of the starting limit relay 138 and the coil 132b of the starter relay 132. 134 is connected to one pole. Coil 13 of starting limit relay 138
One end of 8b connects the starter switch 136 and the normally closed contact 13.
The other end of this coil 138b is connected to a starting control circuit 140.

The starting control circuit 140 includes a thyristor 142, a diode 144, and a neutral switch 146- connected in series between the coil 138b and one pole of the battery 134. This neutral switch 146 is connected to the main shift @50.
The circuit is closed when is in the neutral position. Note that 148 is a neutral lamp that lights up in this neutral position. A diode 150 and a clutch switch 152 are connected between the cand of the thyristor 142 and one pole of the battery 134.
are connected in series. This clutch switch 152 is closed when the manual clutch 48 of the engine 34 is disengaged.

Therefore, when the main transmission 50 is in the neutral position (the neutral switch 146 is closed) or when the clutch 48 is disengaged (the clutch switch is closed), the vehicle is not running, and at this time the cathode side of the thyristor 142 is It is connected to the negative terminal of the battery 134. This condition is illustrated by OR circuit 154 in FIG.

A kill switch 160 and a governor switch 162 are connected in parallel between the gate G of the thyristor 142 and one pole of the battery 134 via diodes 156 and 158, respectively. The kill switch 160 is for stopping the engine in an emergency and is normally open. Further, the governor switch 162 is closed when the governor clutch 90 is connected.

Therefore, when the kill switch 160 is closed or the governor clutch 90 is connected (the governor switch 162 is closed), the gate of the thyristor 142 is grounded and the thyristor 142 continues to be open.
In the figure, the PTO switch 1 is connected to the inverting input terminal of the AND circuit 164.
62. The output of the OR circuit 154 is input to the non-inverting input terminal of the AND circuit 164.

The anode of the thyristor 142 is an NPN) transistor 1.
66 is connected so that its emitter is connected to the ground side, and a resistor 168 is connected between the base and collector, and the base φ
A diode 170 and a PTO switch 172 are connected in series between the emitter and the emitter. This PTO switch 1
72 is closed when the PTO clutch 120 is connected, and P
The circuit is open without TO output.

Therefore, when the PTO clutch 120 is disengaged (PTO switch 172 is open), the transistor 166 is turned on and the gate of the thyristor 142 is grounded. This PTO
The operation of the switch 172 is shown in Figure 2.
This is indicated by the input to the ND circuit 164.

This embodiment works as follows. The main transmission 50 is now in neutral position and the neutral switch 146 is closed)
, or if the clutch 48 is disengaged (the clarification inch 152 is closed), it means that the travel transmission system is disengaged. Therefore, the cathode of the thyristor 142 is grounded, and the thyristor 142 becomes operable.

If the kill switch 160 is open, the governor switch 162 is open, and the governor clutch 90 is disconnected), and the PTO switch 172 is open (PTO clutch 120 is disconnected), and the transistor 166 is off, the thyristor 142
is turned on, and the start limit relay 138 is closed. Therefore, at this time, the starter motor 128 is started by closing the starter switch 136, and the engine 34 can be started.

When the traveling transmission system is in the connected state, that is, both the neutral switch 146 and the clutch switch are off (main transmission 5
0 is in a position other than the 2-tral position and the clutch 48
(when connected), the cathode of the thyristor 142 is ungrounded, the start limiting relay 138 is opened, and the starting of the starter motor 128 is prohibited. Similarly, when the kill switch 160 is open, the governor switch 162 is open, and the PTO switch 172 is closed, the thyristor 14
2 is turned on and the motor 128 can be started (although it is true that if any of these switches 160, 162, and 172 is not in this state, the motor 128 cannot be started).

Although the kill switch 160 was also provided in the above embodiments, the present invention includes an arrangement in which the kill switch 160 is omitted. Further, the governor may be not only a centrifugal type but also an electronic type, and in this case, the governor clutch can be configured with an electric switch.

(Effects of the Invention) As described above, the present invention allows the starter motor to start when the following three conditions are met. In other words, (1) the travel transmission system is in a disconnected state (the vehicle does not start even if the engine starts), (2) the PTO clutch is in a disconnected state (the PTO shaft does not rotate even if the engine starts), and (3) the governor clutch. The engine is allowed to start on the condition that the governor is not working (the engine does not suddenly accelerate even after starting). Therefore, when starting the engine, the engine and P
The TO axis suddenly accelerates and the work vehicle or PTO connected to the vehicle
There is no risk of damaging work equipment connected to the shaft.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is its logic circuit diagram, Fig. 3 is a side view of a vehicle equipped with this engine, and Fig. 4 is an overall development diagram of its power system. . 34... Engine, 48... Clutch, 50... Main transmission, 90... Governor clutch, 94... Governor, 120... PTO clutch, 128... Starter motor, 136... -Starter switch, 138...Start restriction relay, 140...Start control circuit, 146...Neutral switch, 152...Clutch switch, 162...Governor switch, 172...PTO switch.

Claims (1)

[Scope of Claims] Intermittent means for disconnecting and disconnecting a travel transmission system that transmits engine output to drive wheels; a PTO clutch that disconnects and disconnects transmission of the engine output to a PTO shaft; and controlling the engine speed to a set speed or less. In a vehicle that includes a governor, a governor clutch that selects activation/deactivation of the governor, and a starter motor for the engine, the starter motor is provided with: A starting device for a vehicle, further comprising a starting control circuit that enables starting the starter motor when the governor of the governor clutch is inactive.