JPH0618064Y2 - Safety starter for industrial vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a safety starting device for an industrial vehicle, which prevents the industrial vehicle from being started by a starter motor for starting an engine.

(Prior Art) In an industrial vehicle, a safety switch is provided in the operating circuit of the engine starting cell motor to prevent the vehicle from starting by the engine starting cell motor for safety. The engine is started by turning on the safety switch only when in the state.

For example, as shown in FIG. 8, the safety switch 36 'is turned on and off by the movement of the shift rod 35' of the traveling transmission.
Conventionally, there is one that switches FF. This is one in which a cam surface 37 'is formed on the outer periphery of a shift rod 35' that reciprocates in the axial direction when shifting, and a safety switch 36 'that is switched to ON-OFF by axial movement of a spool 38' is used. Is. When the spool 38 'and the shift rod 35' are orthogonal to each other and the spool 38 'is brought into contact with the cam surface 37' via a spring (not shown), the shift rod 35 'is in the neutral position. The safety switch 36 'is turned on by immersing the spool 38' therein, and the spool 38 'is advanced and turned off when in the power transmission position.

In the conventional example shown in FIG. 9, the safety switch 36 'is switched on and off by the clutch pedal 39'.
That is, a tongue piece 40 'that swings along with the clutch pedal 39'.
When the clutch pedal 39 'is attached and the driving power is cut off, the tongue 40'
The spool 38 'is axially retracted to be turned on, and when the clutch is engaged to make a power transmission state, the spool 38' is advanced by a spring (not shown) to be turned off.

(Problems to be solved by the invention) In the case of FIG. 8, since the spool 38 'and the shift rod 35' are orthogonal to each other in the axial direction, the spool 38 'is bent by an axially orthogonal force to be actuated. It was a cause of defects and early damage. Also, in the case of FIG. 9, the clutch pedal 3
Since 9'is frequently operated, the safety switch 36 'has a short life.

Further, as disclosed in Japanese Utility Model Laid-Open No. 60-45130 and Japanese Utility Model Laid-Open No. 58-112642, those in which a plunger of a safety switch is pressed by a lever have been conventionally proposed.
The technologies disclosed in these publications are switches and levers (actuators).
However, there is a risk of malfunction due to the mounting error between the two.

The present invention aims to solve the above problems.

(Means for Solving Problems) The feature point that the present invention takes to solve the problems of the prior art is that the safety switch 16 provided in the operating circuit of the engine starting cell motor 18 of the industrial vehicle 1 is provided. Is a safety starting device for an industrial vehicle that is turned on when the traveling transmission 6 is in a neutral state, wherein the safety switch 16 is switched on and off by axially advancing and retracting the spool 20.
In the traveling transmission device 6, which is switched between the neutral state and the power transmission state by swinging the shift lever 7, the actuating body 24 is swingable on the bracket 17 for mounting the safety switch 16 on the vehicle 1. One end of the actuating body 24 is oscillated in the axial direction of the spool 20 to move the spool 20 forward and backward to switch ON-OFF.
31 and the other end of the actuating body 24 is moved to the shift lever 7, and when the shift lever 7 is in the neutral position, the operating portion 31 is rocked to the ON position, and when the shift lever 7 is in the power transmission position, it is operated. The part 31 is interlocked and coupled via the cam surface 32 so that the part 31 is swung to the OFF position.
The bracket 17 has a mounting portion 17d for the safety switch 16.
And the spool 20 of the switch 16 mounted on the mounting portion 17d
The mounting portion 17b for mounting the actuating body 24 is formed so as to move back and forth in the axial direction.

(Operation) In a state where the shift lever 7 is swung to the neutral position and the driving power is not transmitted, the operating body 24 is interlocked with the swing of the shift lever 7 via the cam surface 32, thereby The operating portion 31 moves the spool 20 forward and backward to turn on the safety switch 16, and the engine starting cell motor 18 can be operated.

When the shift lever 7 is swung to the traveling power transmission position and the traveling power is transmitted, the operating body 24 is interlocked with the swing of the shift lever 7 via the cam surface 32, so that one end thereof is moved. The operating section 31 of the engine moves the spool 20 forward and backward to turn off the safety switch 16, and the engine starter motor 18
Does not work.

Further, since the operating portion 31 swings in the axial direction of the spool 20 to advance and retract the spool 20, the bending moment does not act on the spool 20.

Furthermore, since the bracket 17 has the mounting portion 17d for the safety switch 16 and the mounting portion 17b for the actuating body 24, the safety switch 16
And, the operating body 24 can be attached together with a small error to suppress malfunction and reduce the number of parts.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a tractor 1 as an example of an industrial vehicle,
A vehicle body 8 is configured by connecting the engine 2 and the mission case 3. A gear transmission device for transmitting the rotation of the output shaft of the engine 2 to the rear wheels 4 is built in the transmission case 3, and the transmission device includes a main transmission device 5 and an auxiliary transmission device 6.
And are interposed, and the gears are individually changed.

As shown in FIGS. 1 to 3, the operating shift lever 7 of the auxiliary transmission device 6 is attached to a pivot shaft 10 projecting from a base plate attached to a vehicle body 8 so as to be swingable back and forth. A connecting plate 11 is fixed to the lower end of the shift lever 7, and one end of a link rod 13 is inserted and pivotally supported in a through hole 12 opened in the connecting plate 11. The other end of the link rod 13 has an auxiliary transmission 6
Shift rod 14 for operating a shift fork (not shown)
It is pivotally supported by a tongue piece 15 attached to. This allows
A shift operation is performed by swinging the shift lever 7, a neutral state is set in the first illustrated state, and a power transmission state is set by swinging back and forth from this state.

Further, a safety switch 16 is attached via a bracket 17 to the substrate 9 to which the shift lever 7 is attached.
As shown in FIG. 6, the safety switch 16 is a normally-open switch connected in series with the main key switch 19, which is installed in the operating circuit of the engine starting cell motor 18. Even if is turned on, the starter motor 18 does not operate unless the safety switch 16 is turned on. Further, the safety switch 16 includes a spool 20 that advances and retracts in the axial direction, is biased in the advancing direction by a spring (not shown), and is turned on by axially moving the spool 20 in the retracting direction.

The mounting bracket 17 of the safety switch 16 includes a first portion 17a having a T shape in a side view and having a long hole 22 for inserting the mounting screw 21 into the board 9, and a first portion 17a extending outward from the upper end of the first portion 17a. The two portions 17b and the plan view U from the outer end of the second portion 17b.
It is formed of a third portion 17c extending in a letter shape and a fourth portion 17d extending outward from the middle of the first portion 17a. In the opening 23 provided in the fourth portion 17d, the safety switch 16
The front end is fitted, and the axial center of the spool 20 is in the front-back direction.

Here, the fourth part 17d of the bracket 17 is the safety switch 16
And the second portion 17b serves as the mounting portion for the actuating body 24, and the spool 2 of the switch 16 mounted on the mounting portion 17d
The operating body 24 is attached to the mounting portion 17b so that the operating portion 31 of the operating body 24 is opposed to 0 in the axial direction.

A crank rod-shaped actuating body 24 is swingably attached to the third portion 17c of the bracket 17. Therefore, a notch 28 in the front-rear direction is provided in the facing portions 25 and 26 and the connecting portion 27 that form the third portion 17c that is U-shaped in plan view. Further, the actuating body 24 has a first portion 24a whose upper end has a horizontal axis, and a second portion 24b which extends downward from the inner end of the first portion 24a,
The third portion 2 extending inward from the inner end of the second portion 24b
4c and a fourth portion 24d extending downward from the inner end of the third portion 24c. Then, the third portion 24c of the actuating body 24 is inserted into the notch 28 of the third portion 17c of the bracket 17 and pivotally supported by the facing portions 25 and 26, so that the actuating body 24 has the axis of the third portion 24c. It is possible to swing back and forth around the heart. To prevent the actuating body 24 from coming off, a headed retaining pin 29 is inserted between the connecting portion 27 of the third portion 17c of the bracket 17 and the actuating body 24, and the pin 29 is prevented from coming off by the split pin 30. Has been done.

Then, the lower end of the fourth portion 24d of the actuation body 24 is flat,
The safety switch 16 is brought into contact with the spool 20 and swings back and forth to cause the spool 20 to project and retract so that the safety switch 16 is turned on.
It is an operation unit 31 for N-OFF switching.

The first portion 24a of the actuating body 24 is the shift lever 7
The cam surface 32 is interlocked and connected. This cam surface
As shown in FIG. 5, reference numeral 32 denotes an inner peripheral surface of a guide hole 33 opened at one end of the connecting plate 11 attached to the shift lever 7. The first portion 24a of the first portion 24 is inserted. The guide hole 33 is
The side view has an inverted V shape, and a distance R1 from the center of the pivot 10 of the shift lever 7 to a central portion 33a thereof is larger than a distance R2 to both end portions 33b thereof.

When the shift lever 7 is in the neutral state, the first portion 24a of the actuating body 24 is guided by the guide hole 3 as shown in the first illustration.
The operation portion 31 is located at the central portion 33a of the third portion 3 and is in a state where the spool 20 is pushed and retracted. In this state, the safety switch 16 is turned on, so the main key switch 19
By turning on, the starter motor 18 can be started and the engine 2 can be started. At this time, since the auxiliary transmission device 6 is in the neutral state, the tractor 1 does not start. Then, as shown in FIG. 7, when the shift lever 7 is oscillated from the neutral state to the power transmission state, the first portion 24a of the actuating body 24 moves back and forth through the cam surface 32 of the guide hole 33. As a result, the operation unit 31 moves in the advancing direction of the spool 20, and the spool 20 is advanced by the spring, so that the safety switch 16 is turned off. Therefore, even if the main key switch 19 is turned on in this state, the starter motor 18 does not start, so the engine 2 is not started and the tractor 1 is not started.
Will never start.

According to the above embodiment, the spool 20 of the safety switch 16 is
Since the spool 20 is moved forward and backward by the operating portion 31 which swings in the forward and backward directions, it does not receive a bending force, and the spool 20 shifts with the swing of the shift lever 7 for shifting, which is less frequently used than the clutch. Since the advance / retreat is performed, it is possible to prevent the safety switch 16 from malfunctioning and prematurely damaged. In particular, in this embodiment, the spool 20 moves forward and backward in conjunction with the shift lever 7 of the auxiliary transmission 6 which is used less frequently than the main transmission 5, which is effective in preventing the life of the safety switch 16 from being shortened.

According to the present invention, since the spool of the safety switch is advanced and retracted by the operating portion of the operating body that swings in the spool advancing / retracting direction, it does not receive a bending force, and malfunctions and early damage are prevented. To be prevented. In addition, bracket 17 is a safety switch
Since there is a mounting portion 17d of 16 and a mounting portion 17b of the actuating body 24, and the spool 20 of the switch 16 can be co-attached to each other so as to advance and retreat in the axial direction, both 16 and 24 can be attached with less error and malfunction. The number of parts can be saved while suppressing. Further, since the actuating member is linked to the shift lever for shifting, which is less frequently used than the clutch, the spool of the safety switch is not frequently moved forward and backward, and the life of the spool can be prevented from being shortened.

[Brief description of drawings]

1 to 7 relate to an embodiment of the present invention. FIG. 1 is a side view of a main portion of a safety starting device, FIG. 2 is a front view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a tractor. FIG. 5 is a side view of the shift lever and the cam surface, FIG. 6 is an electric circuit diagram of the safety starting device, FIG. 7 is an explanatory view of the same action, and FIGS. 8 and 9 are
It is a side view of the safety starting device which concerns on a respectively different conventional example. 1 ... tractor, 6 ... auxiliary transmission, 7 ... shift lever, 16 ... safety switch, 17 ... bracket, 18 ... starter motor, 20 ... spool, 24 ... actuating body, 31 ... operating part , 32 …… Cam surface.

Claims (1)

[Scope of utility model registration request] 1. A safety switch (16) provided in an operating circuit of a starter motor (18) for starting an engine of an industrial vehicle (1) is turned on when a traveling transmission (6) is in a neutral state.
A safety starting device for an industrial vehicle, wherein the safety switch (16) is turned on by moving the spool (20) back and forth in the axial direction.
The transmission transmission (6) is switched off and the shift lever (6)
The safety switch, which is operated to switch between the neutral state and the power transmission state by the swinging operation of (7),
Attach the actuator (2) to the bracket (17) that attaches (16) to the vehicle (1).
4) is swingably attached, and one end of this actuator (24)
The spool (20) is oscillated in the axial direction to move the spool (20) forward and backward, thereby making an ON-OFF switching operation part (31), and the other end of the actuating body (24) is connected to the shift lever (7). ,shift lever
When the operation part (31) is in the neutral position, the operation part (31) is rocked to the ON position, and when it is in the power transmission position, the operation part (31) is rocked to the OFF position. , Interlockingly connected via the cam surface (32), and the bracket (17) further includes a mounting portion (17d) for the safety switch (16),
The spool (2) of the switch (16) mounted on the mounting portion (17d)
A safety starting device for an industrial vehicle, characterized in that a mounting portion (17b) for mounting the actuating body (24) is formed so as to move the (0) axially forward and backward.