JPS6225939Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a safety switch device for preventing danger when starting the engine of an agricultural tractor.

(b) Conventional technology Conventionally, in order to prevent a sudden start when starting the engine of an agricultural tractor, there have been devices that prevent the starter motor from starting unless the travel gear is in neutral, and devices that do not start the starter motor unless the travel clutch pedal is depressed. The device that wouldn't start was hot.

For example, Publication No. 47-21029 and Publication No. 54-
As in Publication No. 17236.

(c) Problems that the invention aims to solve However, in the case of conventional agricultural tractors of this type, power is transmitted from the main clutch to the traveling gear.
Since power is transmitted to the PTO shaft through these, if the traveling gear is in neutral, the power to the PTO shaft would naturally have been cut off.

However, recently dual clutch devices have been used in place of the conventional main clutch.
Increasingly, only the PTO shaft is configured as an independent PTO shaft that can rotate even when the tractor is stopped.

In such a case, the safety switch, which can be activated only when the driving gear is set to neutral or when the clutch pedal is depressed, as described above,
If the PTO gear was in the shifting position, the work equipment would start rotating as soon as the engine started, causing a problem.

This invention aims to solve these problems,
The PTO transmission is also equipped with a safety switch.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

In a configuration in which a dual clutch device is installed at the rear of the engine E, and the traveling power transmission path and the PTO power transmission path can be independently connected and disconnected, the starting motor of the engine E, the battery 4, and the starter key switch 2 are connected to each other. , safety switch 21 for traveling gear shifting and safety switch 6 for PTO shifting are arranged in series, and both traveling gear shifting and PTO shifting are in neutral, and both safety switches 21 and 6 are ON.
The PTO gear shift lever 5 is configured so that the engine E can be started in the case of
A switch arm 7 is provided at the base of the switch arm 7, and is fixed to a switch stay 8 so as to be in contact with the switch arm 7.

(e) Embodiment The purpose and structure of the present invention are as described above, and next, the structure for achieving the purpose will be explained.

FIG. 1 is a circuit diagram of the safety start device of the present invention.

The starting motor of engine E is started by battery 4, starter key 3 is inserted into key switch 2, and the switch is turned on to start engine E.

In this circuit, there are two safety switches 21 for cruising gear shifting and two safety switches 6 for PTO gear shifting.
The two safety switches are arranged in series, and the engine E can be started only when both safety switches are in the neutral state or the clutches are in the disengaged state.

Figure 2 is a side view of the fender section showing the mounting position of the safety switch for PTO shifting, Figure 3 is a plan view of the same, Figure 4 is a side view of the seat, and Figure 5 is a side view of the fender section.
The figure is a rear view of the seat support, Figure 6 is a side view of the PTO gear shift lever, Figures 7 and 8 are diagrams showing the positions of the PTO gear shift lever in 2nd and 1st gears, and Figure 9 is a diagram showing the positions of the PTO gear shift lever in 2nd and 1st gears.
Rear view of PTO gear shift lever, Figures 10 and 11
12 are a plan view, a rear view, and a side view of the seat bracket.

A hydraulic case 14 is fixed to the upper surface of the rear axle case 12, and a seat bracket 9 is fixed to the upper surface of this hydraulic case 14.

The configuration of the seat bracket 9 is shown in FIG.
1 and 12, fender stays 20 of fenders 11L and 11R are fixed to a seat bracket 9 for cushion support which is bent into an inverted hat shape. Bolts 20a, 20a are fixed to both ends of the fender stay 20, and the fenders 11L, 11R are attracted and fixed with these bolts.

In the present invention, a mounting hole 9a is provided on the side surface of this seat bracket 9, and the switch stay 8 of the safety switch 6 is fixed therein.
A safety switch 6 for PTO safety is fixed in a state protruding downward and diagonally rearward.

PTO gear shift lever 5 and safety switch 6
The configuration of is shown in Figures 6 to 9,
The PTO gear shift lever 5 is pivotally supported by the rear axle case 12, and by rotating up and down, the upper stage is
The middle gear is neutral and the lower gear is first gear.

A switch arm 7 of the PTO gear shift lever 5 is provided protrudingly, and the tip of the switch arm 7 is configured as a protruding cam, and the safety switch 6 is pushed in and turned ON only when it is in the neutral position. are doing. At other times, it is OFF and the starting motor does not rotate.

In FIGS. 4 and 5, the front end of the seat 15 is pivotally supported by a pivot shaft 10 protruding from the hydraulic case 14, and the rear end is elastically supported by a cushion rubber 17 and a spring 16. 18 is a hydraulic lift arm.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, on tractors equipped with a dual clutch system, the transmission is in neutral and the main clutch is disengaged, so when the engine is started,
Because the PTO was in gear, the rotary tiller suddenly rotated, and if the rotary tiller was placed on the ground, the tiller claws would dig into the ground, causing the aircraft to suddenly start, or the assistant There was a danger that the rotary claw might catch the rotary claw.

In contrast, as in the present invention, a safety switch 6 that enables the engine to start when the PTO shift lever is in the neutral position is provided near the PTO shift lever 5, so that when the independent PTO shaft does not rotate at the neutral position, For the first time, the engine E can be started using the starter key 3, thereby eliminating the above-mentioned danger.

Second, when the switch operation piece is configured to be operated using a movable plate formed by the PTO shift lever 5 and the travel shift lever, as in the conventional technology described in Japanese Utility Model Publication No. 54-17236, When the movable plate is in the rotation position of the movable plate in the middle of a gear shift operation, turn on the switch, other than when both levers are in the neutral position.
There are two positions on the left and right to operate the starter key, and when the starter key is operated in these positions, the engine can be started when the travel gear and PTO gear are not in neutral.

In the present invention, since both devices are equipped with a switch and constitute a safety device using an electric circuit, there is no possibility of such malfunction occurring.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of the safety start device of the present invention, Figure 2 is a side view of the fender section showing the mounting position of the safety switch for PTO shifting, and Figure 3.
The figure is also a plan view, Figure 4 is a side view of the seat part,
Figure 5 is a rear view of the seat support part, Figure 6 is a side view of the PTO gear shift lever, Figures 7 and 8 are drawings showing the positions of the PTO gear shift lever in 2nd and 1st gears, and Figure 9
The figure is a rear view of the PTO gear shift lever, Figure 10, Figure 1.
1 and 12 are a plan view, a rear view, and a side view of the seat bracket. E...Engine, 5...PTO gear lever, 6
...Safety switch.

Claims (1)

[Scope of utility model registration request] In a configuration in which a dual clutch device is installed at the rear of the engine E, and the traveling power transmission path and the PTO power transmission path can be independently connected and disconnected, the starting motor of the engine E, the battery 4, and the starter key switch 2 are connected to each other. , safety switch 21 for traveling gear shifting and safety switch 6 for PTO shifting are arranged in series, and both traveling gear shifting and PTO shifting are in neutral, and both safety switches 21 and 6 are ON.
The PTO gear shift lever 5 is configured so that the engine E can be started in the case of
A safety switch device for an agricultural tractor, characterized in that a switch arm 7 is provided at the base of the tractor, and a safety switch 6 fixed to a switch stay 8 is disposed in contact with the switch arm 7.