JPS6242586Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a starting safety device for mobile agricultural machines such as tractors and combines that prevents the engine from being started unless the gear shift lever is in a neutral position.

For mobile agricultural machines such as tractors and combines, if the engine is started with the gear shift lever in the high, medium, or low speed position, the machine will move forward or backward inadvertently, which is extremely dangerous. . Therefore, in order to prevent the engine from starting unless the gear shift lever is placed in the neutral position, a starting safety switch has been provided corresponding to the neutral position of the gear shift lever, and the operating end of the starting safety switch is connected to the gear shift lever. In many models, the engine can only be started when the shift lever is in the neutral position by being pushed by the shift lever. However, the safety switch itself has a contact operating stroke, and the shift lever also has lateral play, so the starting safety switch closes even when the shift lever is just before or after the neutral position, completely eliminating the danger. I couldn't do it. Further, even though the starting safety switch is disabled after the engine has started, it is repeatedly opened and closed each time the gear shift lever is operated, resulting in inconveniences such as shortening its lifespan.

In view of the above-mentioned actual situation, the present invention aims to eliminate the inconvenience.In particular, the present invention provides a holder that can be integrally rotated in the same direction as the speed change direction of the speed change lever on the speed change shaft of the speed change mechanism. A part of the holder is configured to face the tilted side of the gear shift lever, and a starting safety switch is attached to the holder on the opposite side, so that the gear shift lever can be placed in the neutral position and the gear shift lever can be further moved. The engine start safety switch is prevented from closing unless the gear shift lever is tilted in a direction perpendicular to the gear shift direction, thereby reliably preventing the engine from starting when the gear shift lever is in a position other than the neutral position, thereby ensuring safety during startup. At the same time, it is possible to prevent the starting safety switch from being opened or closed by shifting operations other than when starting the engine, thereby eliminating its invalid operation and greatly extending the service life of the starting safety switch. However, the present invention aims to provide a starting safety device for a mobile agricultural machine that can reliably operate the gear shift lever to the neutral and starting positions.

To explain the configuration of the present invention with reference to an embodiment shown in the drawings, in FIGS. 1 to 4, 1
is a speed change lever, and the base end of the horizontal portion of the speed change lever 1 is connected to a connecting member 4 which rotates integrally with the speed change shaft 3 of the speed change mechanism 2 in the rotational direction and is tiltable in the direction orthogonal thereto. It is attached through. 5
1 is a gear case of the transmission mechanism 2, 6 is a transmission slide gear, and 7 is a shift arm. 8 is gear shift lever 1
The lever guide 8 is a lever guide of
A shift guide groove 9 is formed that guides the shift lever 1 in the rotating direction of the shift shaft 3, that is, in the shifting direction, and one end of the shift guide groove 9 is at a low speed position L, with a neutral position N as a boundary. The other end is at a medium speed position M, and the other end is at a high speed position H. The lever guide 8 also has a neutral position N of the gear shift guide groove 9.
Corresponding to this, a starting guide groove 10 in a direction perpendicular to the gear shifting direction is formed continuously. Reference numeral 11 indicates an adjustment guide plate for the starting guide groove 10, and reference numerals 12 and 12 indicate fixing screws for adjustment thereof.

On the other hand, 13 is a speed change positioning mechanism, and the speed change positioning mechanism 13 has low speed L, neutral N, and medium speed M.
and positioning holes 14, 14... corresponding to high speed H.
The holder 17, to which the ball locking mechanism 16 is attached, is connected to the speed change shaft 3 via a fixing member 18 to the speed change lever. It is fixed so that it rotates integrally in the same direction as the speed change direction of No. 1. The other end of the holder 17 is extended to face the horizontally lower tilted side of the gear shift lever 1, and an engine starting safety switch 19 is mounted on the extended portion at a position facing the gear shift lever 1. has been done. Reference numeral 20 denotes a positioning mechanism for tilting the shift lever 1. The tilting operation positioning mechanism 20 has a ball 21 and a compression spring 22, and is configured to tilt the shift lever 1 to the shift operation position or in a direction perpendicular to the shift direction. It regulates operations. The starting safety switch 19 is connected in series with the engine starting switch.

In the configuration as described above, by tilting the shift lever 1 back and forth according to the shift guide groove 9 of the lever guide 8, the shift mechanism 2 can be moved from a neutral position N to a low speed position L to a medium speed position. It can be in any state of M or high speed position L. Each shift operation position is defined by the shift positioning mechanism 13.

On the other hand, when starting the engine, the shift lever 1 is placed in the neutral position N, and if the shift lever 1 is further tilted in a direction perpendicular to the shift direction according to the starting guide groove 10, the shift lever 1 is moved. Gear shift shaft 3
The starting safety switch 19 is pushed and closed, and the gear shift lever 1 is moved downward.
This state is maintained by the positioning mechanism 20 of the tilting operation. Therefore, the engine can be started by turning on the engine starting switch. However, the shift lever 1 is at the neutral position N.
When the gearshift is in a position other than N, it is completely impossible to tilt the shifter in a direction perpendicular to the gearshift direction, so the engine will never be started inadvertently at a position other than the neutral position N. Safety at startup can be ensured. Further, the shift shaft 3 of the shift mechanism 2 is provided with a positioning mechanism 20 for tilting operation.
A holder 17 equipped with a gear shift lever 1 is provided so as to be able to rotate integrally with the gear shift lever 1, and an engine starting safety switch 19 is attached to the holder 17, so that the gear shift lever 1 is moved after the engine is started.
The starting safety switch 19 is not opened or closed by the speed change operation, thereby eliminating invalid operation of the starting safety switch 19 and greatly extending its life. Furthermore, with the above configuration, the shift lever 1 can be accurately tilted from the neutral position N in a direction perpendicular to the shift direction, and the engine can be reliably started while maintaining this state. .

In short, the present invention mounts a shift lever on the shift shaft of a transmission mechanism so as to be rotatable in a direction perpendicular to the shift direction, and allows the shift lever to be tilted in a direction perpendicular to the shift direction in a neutral position. In a starting safety device that closes an engine starting safety switch only by tilting the gear lever in a neutral position, a holder that can integrally rotate in the same direction as the gear shifting direction of the gear shift lever is provided on the gear shifting shaft of the gear shifting mechanism. A part of the holder is configured to face the tilted side of the gear shift lever, and a starting safety switch is attached to the holder on the opposite side. The engine starting safety switch will not close unless the gear lever is tilted in a direction perpendicular to the direction of the vehicle, thereby reliably preventing the engine from starting when the gear shift lever is in a position other than the neutral position, thereby ensuring safety during starting. At the same time, it is possible to prevent the starting safety switch from being opened or closed by shifting operations other than when starting the engine, thereby eliminating its invalid operation and greatly extending the service life of the starting safety switch. This provides extremely useful practical effects, such as being able to reliably operate the gear shift lever to the neutral and starting positions.

[Brief explanation of the drawing]

The drawings show an embodiment of the starting safety device for a mobile agricultural machine according to the present invention, in which Fig. 1 is a vertical sectional side view of the main part, Fig. 2 is a plan view of the lever guide,
Figure 3 is a sectional view of the positioning mechanism for tilting operation;
The figure is a front view of the speed change position regulating plate. In the figure, 1 is a shift lever, 2 is a shift mechanism, 3 is a shift shaft, 4 is a connecting member, 7 is a shift arm, 8 is a lever guide, 9 is a shift guide groove, 10 is a starting guide groove, and 13 is a shift positioning mechanism , 15 is a speed change position regulating plate, 17 is a holder, 18 is a fixing member, 19 is a starting safety switch, and 20 is a positioning mechanism for tilting operation.

Claims (1)

[Scope of utility model registration request] A speed change lever is mounted on a speed change shaft of the speed change mechanism so as to be rotatable in a direction perpendicular to a speed change direction, and the speed change lever can be tilted in a direction perpendicular to the speed change direction when in a neutral position, and when the speed change lever is in a neutral position, In a starting safety device that closes an engine starting safety switch only by tilting the gear lever, a holder is provided on the gear shift shaft of the gear shift mechanism and can be rotated integrally in the same direction as the shift direction of the gear shift lever, and a part of the holder is attached to the shift shaft of the gear shift mechanism. A starting safety device for a mobile agricultural machine, characterized in that the starting safety switch is configured to face the tilted side of the speed change lever and a starting safety switch is mounted on the opposite side holder.