JP2001206096A - Engine-starting device for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start an engine from a driver's seat capable of turning round in the longitudinal direction even without stepping a clutch pedal. SOLUTION: This engine-starting device is provided with a driver's seat 12 capable of being turned round in the longitudinal direction in the rear upper section of a tractor body 11 and a working machine 14 secured at the rear section of the tractor body 11 and has an engine starting switch 2, a clutch sensor 4 for detecting the disengaging state of the clutch pedal 3, a speed change sensor 6 for detecting a speed change lever 5 in a neutral state, a travel system sensor 8 for detecting a travel operation pedal 7 in a neutral state, and a PTO sensor 10 for detecting the disengaging state of a PTO lever 9. When the engine starting switch 2 is arranged near the driver's seat 12, and the travel system sensor 8 and the PTO sensor 10 are detected and at least either the clutch sensor 4 or the speed change sensor 6 is detected, an engine can be started by the engine starting switch 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor engine starting device.

[0002]

2. Description of the Related Art In a tractor, a working machine is connected for field work and civil engineering work, and this working machine can be driven by hydraulic pressure from the tractor body side or rotational power from a PTO shaft. In addition, a safety mechanism is provided in the engine starting device in order to avoid unintended operation start of the working machine. This safety mechanism includes a clutch sensor for detecting a disengaged state of a clutch pedal, a shift sensor for detecting a neutral state of an auxiliary shift lever, a traveling system sensor for detecting a neutral state of a travel operation pedal, and a disengaged state of a PTO lever. The PTO sensor to be detected is connected to the engine start switch, and the engine can be started by the engine start switch only when all of the clutch sensor, the shift sensor, the traveling system sensor, and the PTO sensor are in the detection state. It is configured as follows.

[0003]

In the above-mentioned prior art, 4
If all types of sensors are not in the detection state, the engine can not be started, especially the clutch pedal is in the basic state, so the engine can not be started unless the clutch pedal is turned off from the front driver's seat, and after work stoppage It is very inconvenient when working again. In particular, in the case of tractors, loaders, and backhoes, a work machine such as a backhoe is attached to the rear of the tractor body and the driver's seat is turned backward. The clutch pedal must be disengaged forward and turned off, and the engine cannot be started in the rearward driver's seat, causing a reduction in work efficiency.

[0004] The present invention relates to a tractor engine starter which enables an engine to start when a traveling system sensor and a PTO sensor are in a detection state and at least one of a clutch sensor and a shift sensor is in a detection state. The purpose is to provide. The present invention relates to a traveling system sensor and P
Provided is an engine starter for a tractor that enables an engine start switch to be operated from a driver's seat that can be turned back and forth when a TO sensor is in a detection state and at least one of a clutch sensor and a shift sensor is in a detection state. The purpose is to do.

According to the present invention, an engine start switch and a shift lever can be operated from a rearward facing driver's seat, and the engine can be started from a rearward facing driver's seat when a traveling system sensor and a PTO sensor are in a detection state. It is an object of the present invention to provide an engine starting device for a tractor.

[0006]

A first concrete means for solving the problem according to the present invention is that an engine start switch 2 is provided.
A clutch sensor 4 for detecting a disengaged state of the clutch pedal 3, a shift sensor 6 for detecting a neutral state of the shift lever 5, a traveling system sensor 8 for detecting a neutral state of the traveling operation pedal 7, and a PTO lever 9. PT to detect disconnection state
The engine start switch 2 is provided when the traveling system sensor 8 and the PTO sensor 10 are in the detection state and at least one of the clutch sensor 4 and the shift sensor 6 is in the detection state. That the engine can be started.

As a result, even if the clutch pedal 3 is not disengaged, the engine can be started if the shift lever 5 is in the neutral state. A second specific means for solving the problem in the present invention is to arrange a driver seat 12 which is reversible in the front and rear at an upper rear portion of a tractor vehicle body 11, attach a work implement 14 to a rear portion of the tractor vehicle body 11, and set an engine start switch. 2
A clutch sensor 4 for detecting a disengaged state of the clutch pedal 3, a shift sensor 6 for detecting a neutral state of the shift lever 5, a traveling system sensor 8 for detecting a neutral state of the traveling operation pedal 7, and a PTO lever 9. PT to detect disconnection state
The engine start switch 2 is disposed in the vicinity of the driver's seat 12 so that the traveling system sensor 8 and the PTO sensor 10 are in the detection state, and at least one of the clutch sensor 4 and the shift sensor 6 is in the detection state. In this state, the engine can be started by the engine start switch 2.

As a result, the engine can be started by operating the engine start switch 2 from the backward driver's seat 12 if the shift lever 5 is in the neutral state without the clutch pedal 3 being disengaged. A third concrete means for solving the problem in the present invention is the tractor body 1
A driver's seat 12 that can be turned back and forth is disposed at the upper rear of the vehicle 1, rear wheel fenders 13 are disposed on the left and right sides of the driver's seat 12, and a backhoe 14 that is operated from the rearward driver's seat 12 is attached to the rear of the tractor body 11. And the engine start switch 2
A clutch sensor 4 for detecting a disengaged state of the clutch pedal 3, a shift sensor 6 for detecting a neutral state of the auxiliary shift lever 5, a traveling system sensor 8 for detecting a neutral state of the traveling operation pedal 7 for HST operation, and a PTO lever 9, a PTO sensor 10 for detecting a turning state of the engine 9 and the engine start switch 2 and the speed change lever 5 are arranged near the rearward driver's seat 12 and between the rear wheel fender 13 and the traveling system sensor 8 and the PTO sensor When the sensor 10 is in the detection state and at least one of the clutch sensor 4 and the shift sensor 6 is in the detection state, the engine can be started by the engine start switch 2.

Accordingly, the shift lever 5 is set to the neutral state from the backward driver's seat 12 and the engine start switch 2 is operated without the clutch pedal 3 being disengaged.
It is possible to start the engine.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 8, reference numeral 1 denotes a tractor / loader / backhoe, and a tractor 21 directly connects a transmission case 23 to an engine 22;
, A front axle frame 24 protrudes forward, a rear axle case 30 protrudes from the rear of the transmission case 23 to the left and right, and a front wheel 25 and a rear wheel 26 are suspended to form a tractor body 11.
Is formed.

From the abdomen of the tractor body 11 to the rear axle case 30, a substantially rectangular frame-shaped reinforcing frame 27 is provided in a plan view, and a front loader 28 is mounted on the reinforcing frame 27 and the front axle frame 24. Further, a backhoe (working machine) 14 is attached to the rear part of the reinforcing frame 27. A maneuvering section 32 having a handle 31 is provided on a substantially central portion of the tractor body 11, and a hydraulic device 29 is mounted on a rear upper part of the vehicle body behind the steering section 32. A floor sheet 33 is provided so as to cover the rear upper part of the vehicle body. The driver's seat 12 is of a rotating seat type and is mounted on a lower seat 33 so as to be capable of being turned back and forth.

The rear wheel fender 13 covering the left and right rear wheels 26 is
A rops 34 that is mounted on the tractor body 11 and is connected to the floor seat 33 and that guards the driver's seat 12 is mounted at the rear of the reinforcing frame 27. An operation unit 35 for controlling a boom, a bucket, and the like is provided at a front portion of the backhoe 29. The operation unit 35 can be operated by the driver sitting on the driver's seat 12 which is turned back and forth and faces backward. . In the transmission case 23, a main clutch for connecting and disconnecting the power from the engine 22, an HST (hydrostatic transmission) for continuously shifting the power transmitted from the main clutch forward and backward, and an auxiliary transmission mechanism for shifting the power of the HST , Which changes the engine power and transmits it to the PTO shaft
A TO speed change mechanism and the like are built in.

1 to 7, an engine start switch (starter switch) 2 for starting the engine 22 by a key.
Is disposed on the control section 32 in a general tractor, but is disposed on an operation box 38 provided between the driver's seat 12 and the rear wheel fender 13 here. The operation box 38 is mounted on the surface of the rear wheel fender 13 on the driver's seat 12 side, and thereafter the engine start switch 2 is provided on the upper part. Easy to operate. The operation box 38 includes a transmission lever 5, a PTO lever 9,
The hand accelerator lever 39 and the hydraulic control lever 40 are guided. The hand accelerator lever 39 is connected to the engine 22 and the hydraulic control lever 4
0 indicates that the hydraulic device 29 can be controlled.

The PTO lever 9 is connected to the engine start switch 2
, And the connection and disconnection (and shift) of the PTO power can be operated via the PTO transmission mechanism.
When the lever 9 is turned off, the PTO sensor 10 detects it. The speed change lever 5 is a sub speed changeover lever that switches the sub speed change mechanism to three stages of high, medium and low, and is attached to a shifter operation shaft 41 supported by a casing of the hydraulic device 29 as shown in FIGS. . A support plate 42 that rotates integrally with the shift lever 5 is attached to the operation shaft 41, and an arc plate 43 is provided on the support plate 42. The arc plate 43 can contact the ball 6a of the shift sensor 6. ing.

When the shift lever 5 is at a position between the high-speed position and the medium-speed position, and between the medium-speed position and the low-speed position, the sub-transmission mechanism can be set to the neutral state. The neutral state of the subtransmission mechanism is detected. The arc plate 43 is formed with a hole 43a that engages with the ball 6a when the shift lever 5 is in the neutral position (or in the high, middle, low and three positions). The hole 43a has a diameter larger than that of the related art, and is formed, for example, to be equal to or larger than the diameter of the ball 6a. An operation shaft 41, a shifter, a link, and the like are interposed from the speed change lever 5 to the auxiliary speed change mechanism, which may cause play and tolerance. The speed change sensor 6 is located on the casing of the hydraulic device 29 via the bracket 44. It is mounted so as to be adjustable, and can be adjusted with the bracket 44 or adjusted with a shim.

However, the position adjustment work is difficult due to the small mounting place of the speed change sensor 6, and there are many variations by the adjustment operator, so that it may be difficult to operate the speed change sensor 6 properly. Therefore, as described above, by making the diameter of the hole 43a large with respect to the ball 6a and making rough engagement, the backlash is absorbed by the hole 43a, and the adjustment work at the time of assembly is facilitated. To reduce the variation due to 1 and 6, a clutch pedal 3 is pivotally supported on a support base 46 that supports the control unit 32 behind the engine 22, and the clutch pedal 3 is in a position where the main clutch is connected in a basic state.
The clutch can be disengaged by stepping on the left foot. When the clutch pedal 3 is depressed, the arm 47 activates the clutch sensor 4 to detect that the main clutch has been disengaged.

In FIGS. 1 and 7, reference numeral 7 denotes a travel operation pedal pivotally supported on a right step 45 via a horizontal shaft 48.
By operating the HST (hydrostatic transmission) by stepping forward and backward, the tractor 21 is moved forward or backward while continuously changing the speed. The traveling operation pedal 7 is connected to a swash plate shaft of the HST via a link 49, a bell crank 50, and the like, and a traveling system sensor 8 that is in contact with the bell crank 50 is mounted on a side surface of the transmission case 23. The traveling system sensor 8 detects a neutral position where the traveling operation pedal 7 is not depressed, and detects a neutral state of the HST.

FIG. 2 shows the engine start switch 2, the clutch sensor 4, the shift sensor 6, the traveling system sensor 8, and the PT.
The electrical circuit (safety circuit) of the O sensor 10 is represented by a logic circuit, and includes a clutch sensor 4 and a shift sensor 6.
Is connected to a logical sum (OR, OR) element A, and when at least one of them is in a detection state, a true output is output and the signal is sent to a logical product (AND, AND) element B. The traveling system sensor 8 and the PTO sensor 10 are connected to the logical product (AND, AND) element B, and at least one of the clutch sensor 4 and the speed change sensor 6 and the traveling system sensor 8 and the PTO sensor 10 are in the detection state. In this state, a true output signal is output, and by operating the engine start switch 2 in that state, the engine can be started.

Therefore, when starting the engine 22 of the tractor / loader / backhoe 1, when starting the operation while sitting on the driver's seat 12 in a forward posture, the driver sets the traveling operation pedal 7 and the PTO lever 9 to the neutral state, When the clutch pedal 3 is depressed or the shift lever 5 is set to the neutral state, the engine can be started by the engine start switch 2. Cannot depress the clutch pedal 3, but the shift lever 5, the traveling operation pedal 7 and the P
By setting the TO lever 9 in the neutral state, the engine can be started by the engine start switch 2.

The engine start switch 2 can be easily operated because the driver's seat 12 is in the vicinity regardless of whether the driver's seat 12 is turned forward or backward, and the traveling operation pedal 7 is in a neutral state unless depressed, and the PTO sensor 10 is also a clutch sensor. However, if the main clutch is brought into contact after the engine is started with the clutch sensor 4 in the neutral state in the forward position and the PTO shaft rotates, it is not preferable. Therefore, the shift sensor 6 is most preferably connected to the clutch sensor 4 by the OR element A. In addition, when the backhoe operation is performed with the driver's seat 12 facing backward, the auxiliary transmission mechanism is not used at all, so that the transmission lever 5 is not used.
Are arranged at the neutral position, and the situation where the shift lever 5 is moved to the neutral position when the engine is started rarely occurs.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
Although the tractor / loader / backhoe 1 is illustrated, another rear working machine may be attached to the tractor 21.
The present invention can be applied to a case where only the front loader or the tractor 21 is not equipped with the rear working machine.
In a transmission that does not use the HST, a main shift lever, a super-deceleration lever, a forward / reverse switching lever, and the like may be provided in addition to the auxiliary shift lever.
A neutral position detection sensor other than the auxiliary shift lever may be connected to the OR element A.

[0022]

According to the present invention described in detail above, when the traveling system sensor 8 and the PTO sensor 10 are in the detection state and at least one of the clutch sensor 4 and the shift sensor 6 is in the detection state. Since the engine can be started, the engine can be started if the shift lever 5 is in the neutral state without the clutch pedal 3 being disengaged, and the operation of the engine start switch 2 can be performed even when the driver is sitting in the backward driver's seat 12. Further, while sitting in the backward driver's seat 12, not only the operation of the engine start switch 2 but also the operation of the shift lever 5 to the neutral position can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a logic circuit.

FIG. 3 is a side view of the operation box.

FIG. 4 is a sectional side view of a shift lever and a shift sensor.

FIG. 5 is a front view of the same.

FIG. 6 is a side view of a clutch pedal and a clutch sensor.

FIG. 7 is a side view of a travel operation pedal and a travel system sensor.

FIG. 8 is an overall side view of the tractor loader backhoe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor loader backhoe 2 Engine start switch 3 Clutch pedal 4 Clutch sensor 5 Shift lever 6 Shift sensor 7 Travel operation pedal 8 Travel system sensor 9 PTO lever 10 PTO sensor 11 Tractor body 12 Driver's seat 13 Rear wheel fender 14 Backhoe 21) Tractor 38 Operation box A OR device B AND device

Claims (3)

[Claims] An engine start switch, a clutch sensor for detecting a disengaged state of a clutch pedal, a shift sensor for detecting a neutral state of a shift lever, a traveling system sensor for detecting a neutral state of a travel operation pedal, and a PTO lever And a PTO sensor for detecting a disengagement state of the engine. When the traveling system sensor and the PTO sensor are in a detection state and at least one of a clutch sensor and a shift sensor is in a detection state, the engine start switch An engine starting device for a tractor, wherein the engine starting by the engine is enabled. 2. A driver's seat which can be turned around in the front and rear of the tractor body, a work machine is mounted on the rear of the tractor body, an engine start switch, a clutch sensor for detecting a disengaged state of a clutch pedal, and a speed change gear. A shift sensor for detecting a neutral state of a lever, a traveling system sensor for detecting a neutral state of a traveling operation pedal, and a PTO sensor for detecting a disengaged state of a PTO lever, wherein the engine start switch is disposed near a driver's seat. When the traveling system sensor and the PTO sensor are in the detection state and at least one of the clutch sensor and the shift sensor is in the detection state, the engine can be started by the engine start switch. Tractor engine starter. 3. A driver's seat which can be turned back and forth is disposed at the rear upper part of the tractor vehicle body, rear wheel fenders are disposed on the left and right sides of the driver's seat, and a backhoe operated from a rearward facing driver's seat is mounted at the rear of the tractor vehicle body. An engine start switch, a clutch sensor for detecting a disengaged state of the clutch pedal,
A shift sensor for detecting the neutral state of the auxiliary shift lever;
A traveling system sensor for detecting a neutral state of a traveling operation pedal for T operation, and a PTO sensor for detecting a disengaged state of a PTO lever, wherein the engine start switch and the speed change lever are arranged near a rearward facing driver's seat and a rear wheel fender. When the traveling system sensor and the PTO sensor are in the detection state and at least one of the clutch sensor and the shift sensor is in the detection state, the engine can be started by the engine start switch. An engine starting device for a tractor.