JPH0784148B2 - Vehicle starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a starting device applied to a vehicle equipped with a governor for operating an engine at a constant speed and a starter motor for the engine and capable of taking out PTO output. It is about.

(Background of the Invention) While transmitting the output of the engine to the drive wheels via the drive transmission system, the output of this engine can also be transmitted to the PTO shaft.
A work vehicle has been proposed in which the engine can be operated at a constant speed by a governor when the shaft is driven (for example, Japanese Patent Application No. 61-31905).

Here, the governor operates to open the throttle valve of the carburetor, for example, so as to increase the speed of the engine when the engine becomes low speed, so it functions to open the throttle valve to near full opening while the engine is stopped. is there. However, the carburetor of the engine is usually set to start the engine with the throttle valve closed. Therefore, it becomes difficult to start the engine when the throttle valve is fully opened by the governor.

At this time, if the traveling transmission system and the PTO clutch are in the connected state, the load on the starter motor becomes excessive and it becomes more difficult to start the engine. Even if the engine is started with the throttle valve fully open while the transmission system and PTO clutch are disengaged, the engine speed will rapidly increase at this time, causing temporary overspeed, which will damage the engine. Furthermore, at this time, if the traveling transmission system is in the connected state, the vehicle and the work vehicle connected to it will suddenly start,
If the PTO clutch, which connects and disconnects the PTO shaft and the engine, is connected, the PTO shaft will suddenly start rotating. Therefore, there is a problem that the work vehicle towed or driven by the PTO shaft may be damaged.

(Object of the Invention) The present invention has been made in view of such circumstances, and when the engine is started, the throttle valve is fully opened by the operation of the governor, or the traveling transmission system or the PTO clutch is connected to reduce the load of the starter motor. Prevents the engine from becoming difficult to start due to excessive size, and prevents the engine from over rotating even if it starts, preventing damage to the engine due to over rotation. It is an object of the present invention to provide a starting device for a vehicle in which the engine cannot be started while the vehicle is still connected, so that the connected working vehicle is not damaged.

According to the present invention, an object of the present invention is to connect and disconnect a traveling transmission system that transmits the output of the engine to the drive wheels, a PTO clutch that connects and disconnects the transmission of the engine output to the PTO shaft, and A governor that controls the engine speed below the set speed, and a governor clutch that selects whether or not to operate the governor.
In a vehicle including a starter motor for the engine, the starter motor can be started in the starter motor while the traveling transmission system is in a disengaged state, the PTO clutch is disengaged, and the governor clutch is in a governor inoperative state. It is achieved by a starting device for a vehicle, which is characterized in that a starting control circuit is connected.

(Embodiment) FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a logic circuit diagram thereof, FIG. 3 is a side view of a vehicle equipped with this engine, and FIG. 4 is its entire power system. FIG.

In FIG. 3, reference numeral 10 is a vehicle body frame, which has a pair of left and right lower tubes 12, a main tube 14, a front tube 16, a seat rail 18, and the like. Reference numeral 20 is a pair of left and right steering front wheels, and 22 is a pair of left and right driving rear wheels, to which wide ultra-low pressure tires (so-called balloon tires) are mounted. Reference numeral 24 is a steering handlebar located above the front wheels 20, 26 is a fuel tank located at the rear of the steering wheel bar, and 28 is a straddle-type operation seat. Further, 30 is a front fender and 32 is a rear fender.

The 34 is a forced air-cooled overhead camshaft type single cylinder engine.
As shown in FIG. 4, the engine 34 includes a lateral crankshaft 36, a transmission main shaft 38, a transmission auxiliary shaft 40, an intermediate shaft 42, and a reverse shaft 4.
4, equipped with an output shaft 46. A manual clutch 48 is provided at the right end of the main shaft 38, and a gear group forming a foot-type forward main transmission 50 is provided on the main shaft 38 and the auxiliary shaft 40. This main transmission
The neutral position 50 (see FIG. 4) of 50 can be selected. The output shaft 46 is provided with a dog clutch type forward / reverse switching clutch 52 for both forward / reverse switching, which does not have a neutral position.
Can be switched manually.

That is, if 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, the main transmission.
50, the intermediate gear 56 on the intermediate shaft 42, and the low speed gear 52a are transmitted to the output shaft 46, so that the vehicle travels at a low speed. When the switching lever 54 is set to the forward high speed position (H), it is transmitted to the output shaft 46 via the intermediate gear 56 and the high speed gear 52b. Further, when the switching lever 54 is set to the reverse position (R), the rotation of the crankshaft 36 is transmitted to the output shaft 46 via the gears integrated with the clutch 48, the main shaft 38, the reverse shaft 44 and the reverse gear 52c.

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

Reference numeral 60 denotes a rear axle, and a differential case 64 that is biased to the right and accommodates the differential device 62 is integrally attached to the rear axle 60. Left and right drive shafts 66 (66a, 66b) are inserted through the rear axle 60, and the rear wheels 22 are fixed to the protruding ends of the drive shafts 66. Note that the differential device 62 has a position (DIFF) where the differential device 62 is operated by a manual switching lever 68 and a differential device.
It is possible to lock 62 and switch to the (LOCK) position where both rear wheels 22 are driven at the same speed.

The rear axle 60 is vertically movably connected to the frame 10 by two lower arms 70 and one A-shaped upper arm 72 as shown in FIG. That is, the front end of the lower arm 70 is connected to the cross tube 74 that connects the left and right lower tubes 12. The rear end of the upper arm 72, which is the apex of the A shape, is connected to the upper portion of the differential case 64, and
The two front ends, which are the V-shaped legs, are connected to another cross tube 76. Reference numeral 78 is a buffer unit that supports the rear wheel 22.

In FIGS. 3 and 4, reference numeral 80 denotes a carburetor, which includes a piston type throttle valve 84 opened and closed by a throttle lever 82 provided on the steering handlebar 24, and a governor butterfly type throttle valve 86 located downstream thereof. Equipped with. The governor throttle valve 86 is connected to a centrifugal governor 94 provided on the overhead camshaft 92 via a governor clutch 90 which is turned off and turned on by a governor on-off lever 88. In FIG. 3, 96 is an intake air purifier.

98 is a sub reducer. This sub reducer 98 is the engine 34
Further, it is formed separately from the rear axle 60, and is rigidly fixed to the frame 10 so as to be located between the engine 34 and the rear axle 60.

A gear group 102 including a cylindrical cam type damper 100 is accommodated in the sub-reduction gear 98, and the rotation of the output shaft 46 of the engine 34 is transmitted to the gear group 102 via a chain 104. The rotation of the output shaft 106 of the auxiliary speed reducer 98 is connected to the input shaft 110 of the differential case 64 by a lateral drive shaft 108. Both ends of the drive shaft 108 are connected by a universal joint, and the rear axle 60 can be moved up and down.

112 is a PTO gear box and is fixed to the body frame 10. A bevel gear 114 is housed in the gear box 112. The engine 34 is provided with a PTO drive shaft 116.
The rotation of the crankshaft 36 is transmitted to the drive shaft 116 via the clutch 48 and the intermediate gear 118. The 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.

Reference numeral 124 is a PTO switching lever, which connects and disconnects the PTO clutch 120. That is, when the lever 124 is set to the connection position (ON), the idler 126 of the clutch 120 is pressed by the belt to enable rotation transmission, and when the lever 124 is set to the disconnection position (OFF), the pressing force of the idler 126 is reduced and the rotation transmission is blocked. To be done.

Reference numeral 128 is a starter motor, and the rotation of the starter motor 128 is transmitted to the crankshaft 36 via a one-way clutch 130 (Fig. 3).

In FIG. 1, 132 is a starter relay, and the normally open contact 132a of this relay 132 is the starter motor 128 and the battery 13
Together with 4, form a closed circuit. 136 is a starter switch. One end of the starter switch 136 is connected to the positive electrode of the battery 134, and the other end is a normally open contact 138a of the start limiting relay 138.
And the coil 132b of the starter relay 132, and is connected to the negative electrode of the battery 134. One end of the coil 138b of the start limiting relay 138 has a starter switch 136 and a normally closed contact 138.
The coil 138b is connected to a connection point with a, and the other end of the coil 138b is connected to the start control circuit 140.

The start control circuit 140 includes a thyristor 142, a diode 144, and a neutral switch 146 connected in series between the coil 138b and the negative electrode of the battery 134. The neutral switch 146 is closed when the main transmission 50 is in the neutral position. Reference numeral 148 is a neutral lamp that lights up at this neutral position. A diode 150 and a clutch switch 152 are connected in series between the cathode of the thyristor 142 and the negative electrode of the battery 134. The 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 the clutch 48 is disengaged (the clutch switch is closed), the vehicle is not running, and the cathode side of the thyristor 142 is the battery 1 at this time.
Connected to the negative pole of 34. This state is shown in FIG.
Indicated by.

A kill switch 160 and a governor switch 162 are connected in parallel between the gate G of the thyristor 142 and the negative electrode of the battery 134 via diodes 156 and 158, respectively. The kill switch 160 stops the engine in an emergency,
Normally open. Further, the governor switch 162 is closed when the governor clutch 90 is engaged.

Therefore, the kill switch 160 is closed or the governor clutch 90 is closed.
Thyristor 1 by connecting (governor switch 162 closed circuit)
The gate of 42 is grounded and the thyristor 142 continues to open.
This operation of the governor switch 162 is shown in FIG.
It is shown by connecting PTO switch 162 to the inverting input of. The output of the OR circuit 154 is input to the non-inverting input terminal of the AND circuit 164.

An NPN transistor 166 is connected to the anode of the thyristor 142 such that its emitter is on the ground side, a resistor 168 is connected between its base and collector, and a diode 170 and a PTO switch 172 are connected in series between its base and emitter. ing. The PTO switch 172 is closed when the PTO clutch 120 is connected, and is opened without taking out the PTO output.

Therefore, when the PTO clutch 120 is disengaged (PTO switch 172 is open), the transistor 166 turns on and the thyristor 1
Ground the gate of 42. The operation of the PTO switch 172 is shown in FIG. 2 by inputting the switch 172 to the AND circuit 164.

This embodiment operates as follows. If the main transmission 50 is now in the neutral position (neutral switch 146 is closed) or the clutch 48 is disengaged (clutch switch
152 is closed circuit) It means that the transmission system has been disconnected. 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 (governor clutch 90 is disengaged), and the PTO switch 172 is open (PTO clutch 120 is disengaged) and the transistor 166 is off, the thyristor 142 is on. The start limiting 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, when both the neutral switch 146 and the clutch switch are off (when the main transmission 50 is not in the neutral position and the clutch 48 is further connected), the cathode of the thyristor 142 is not grounded,
The start restriction relay 138 is opened to prohibit the start of the starter motor 128. Similarly, when the kill switch 160 is open, the governor switch 162 is open, and the PTO switch 172 is closed, the thyristor 142 can be turned on and the motor 128 can be started, but even if one of these switches 160, 162, 172 is used, When the condition disappears, the motor 128 cannot be started.

Although the kill switch 160 is also provided in the above embodiments, the present invention includes the kill switch 160 omitted. The governor may be not only a centrifugal type but also an electronic type, and in this case, the governor clutch can be constituted by an electric switch.

(Effects of the Invention) As described above, the present invention permits the starter motor to be started when the following three conditions are met. That is, (1) the traveling transmission system is in the disengaged state (the vehicle does not start even if the engine is started), (2) the PTO clutch is in the disengaged state (even if the engine is started, P
Engine does not rotate (TO shaft does not rotate), (3) The governor clutch is in the governor inoperative state (the throttle valve is closed to improve engine startability, and the engine does not overrotate when the engine starts). It allows starting. Therefore, when the engine is started, the throttle valve is closed and the startability of the engine is improved. At this time, the drive system and PT
Since both the O-clutch are disengaged, the load on the starter motor is also reduced and engine startability is further improved.

Furthermore, when the engine is started, the throttle valve closes and the transmission system and the PTO clutch are disengaged, so there is no risk of the engine's rotation rapidly rising, overspeeding, or damaging the engine or work equipment.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a logic circuit diagram thereof, FIG. 3 is a side view of a vehicle equipped with this engine, and FIG. 4 is an overall development view 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 Limiting relay, 140 …… Starting control circuit, 146 …… Neutral switch, 152 …… Clutch switch, 162 …… Governor switch, 172 …… PTO switch.

Claims (1)

[Claims] 1. A connecting / disconnecting means for connecting / disconnecting a traveling transmission system for transmitting engine output to drive wheels, a PTO clutch for connecting / disconnecting transmission of the engine output to a PTO shaft, and a governor for controlling the engine speed below a set speed. And the operation of this governor
In a vehicle provided with a governor clutch for selecting non-operation and a starter motor for the engine, in the starter motor, when the traveling transmission system is in the disengaged state and the PTO clutch is disengaged, the governor clutch is inoperative. A starting device for a vehicle, to which a starting control circuit for enabling the starter motor to be started in a state is connected.