JP3652948B2 - Tractor engine starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine starter for a tractor.
[0002]
[Prior art]
In the tractor, a work machine is connected to perform field work and civil engineering work, and this work machine can be driven by hydraulic pressure from the tractor body side or rotational power from the PTO shaft. In order to avoid the intentional start of operation, the engine starting device is provided with a safety mechanism.
This safety mechanism includes a clutch sensor for detecting the clutch pedal disengagement state, a shift sensor for detecting the neutral state of the auxiliary gearshift lever, a travel system sensor for detecting the neutral state of the travel operation pedal, and the disengagement state of the PTO lever. The PTO sensor to be detected is connected to the engine start switch, and when the clutch sensor, the shift sensor, the traveling system sensor, and the PTO sensor are all in the detection state, the engine start switch can be started for the first time. It is configured as follows.
[0003]
[Problems to be solved by the invention]
In the prior art, the engine cannot be started unless all of the four types of sensors are in the detected state. In particular, since the clutch pedal is in the basic state, the engine starts unless the clutch pedal is turned off from the forward driver seat. It cannot be done, and it is very inconvenient when working again after work stoppage.
In particular, in tractors, loaders, and backhoes, work equipment such as backhoes is installed at the rear of the tractor body and the driver's seat is flipped backwards. The clutch pedal must be turned and turned in the forward direction, and the engine cannot be started in the rear-facing driver's seat, causing a reduction in work efficiency.
[0004]
The present invention provides an engine starter for a tractor that can start an engine 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. For the purpose.
The present invention makes it possible to operate the engine start switch from a driver seat that is reversible forward and backward 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. An object of the present invention is to provide an engine starter for a tractor.
[0005]
According to the present invention, the engine start switch and the shift lever can be operated from the rear driver seat, and the tractor that enables the engine to be started from the rear driver seat when the traveling system sensor and the PTO sensor are in the detection state. An object is to provide an engine starter.
[0006]
[Means for Solving the Problems]
The first specific means for solving the problems in the present invention includes an engine start switch 2, a clutch sensor 4 for detecting the disengagement state of the clutch pedal 3, a shift sensor 6 for detecting the neutral state of the shift lever 5, A travel system sensor 8 for detecting the neutral state of the travel operation pedal 7 and a PTO sensor 10 for detecting the cut-off state of the PTO lever 9 are provided, and the travel system sensor 8 and the PTO sensor 10 are in the detection state and the clutch sensor. The engine start switch 2 enables the engine to be started when at least one of 4 and the shift sensor 6 is in a detection state.
[0007]
Thus, 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 problems in the present invention is that a driver seat 12 that can be reversed in the front-rear direction is disposed at the rear upper part of the tractor vehicle body 11, a work implement 14 is mounted on the rear portion of the tractor vehicle body 11, and an engine start switch 2, a clutch sensor 4 that detects the disengagement state of the clutch pedal 3, a shift sensor 6 that detects the neutral state of the shift lever 5, a travel system sensor 8 that detects the neutral state of the travel operation pedal 7, and a PTO lever 9. The engine start switch 2 is disposed in the vicinity of the driver's seat 12, the traveling system sensor 8 and the PTO sensor 10 are in the detection state, and the clutch sensor 4 and the shift sensor 6 When at least one of them is in the detection state, the engine start switch 2 can start the engine.
[0008]
Thus, even if the clutch pedal 3 is not turned off, the engine start switch 2 can be operated from the backward driver seat 12 to start the engine if the speed change lever 5 is in the neutral state.
A third specific means for solving the problems in the present invention is that a driver seat 12 that can be reversed back and forth is disposed at the rear upper part of the tractor vehicle body 11, and a rear wheel fender 13 is disposed on the left and right sides of the driver seat 12. A backhoe 14 operated from the rear driver's seat 12 is mounted on the rear part of the tractor vehicle body 11 to detect the neutral state of the engine start switch 2, the clutch sensor 4 for detecting the disengagement state of the clutch pedal 3, and the auxiliary transmission lever 5. It has a shift sensor 6, a travel system sensor 8 that detects the neutral state of the travel operation pedal 7 for HST operation, and a PTO sensor 10 that detects the cut-off state of the PTO lever 9. The engine start switch 2 and the shift lever 5 Are arranged in the vicinity of the rearward driver's seat 12 and between the rear wheel fender 13, the traveling system sensor 8 and the PTO sensor 10 are in the detection state, and the clutch sensor. When at least one of the shift sensor 6 is in the detection state, it is that they permit engine start by the engine start switch 2.
[0009]
This makes it possible to start the engine by setting the speed change lever 5 from the backward driver seat 12 to the neutral state and operating the engine start switch 2 without turning the clutch pedal 3 off.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 8, reference numeral 1 denotes a tractor / loader / backhoe. The tractor 21 has a transmission case 23 directly connected to the engine 22, a front axle frame 24 is projected forward from the engine 22, and left and right from the rear portion of the transmission case 23. A rear axle case 30 protrudes laterally, and the front wheel 25 and the rear wheel 26 are bridged to form the tractor vehicle body 11.
[0011]
A reinforcement frame 27 having a substantially square frame shape in plan view is provided from the abdomen of the tractor vehicle body 11 to the rear axle case 30, and a front loader 28 is mounted between the reinforcement frame 27 and the front axle frame 24. A backhoe (work machine) 14 is attached to the rear portion of the frame 27.
A steering section 32 having a handle 31 is provided on a substantially central portion of the tractor vehicle body 11, and a hydraulic device 29 is mounted on the rear upper part of the vehicle body. A floor seat 33 is provided so as to cover the rear upper part of the vehicle body. have been, the driver's seat 12 is reversed freely mounted back and forth on the rotating sheet type full Roashito 33.
[0012]
The rear wheel fender 13 that covers the left and right rear wheels 26 is attached to the tractor vehicle body 11 and connected to the floor seat 33, and a lops 34 that guards the driver's seat 12 is attached to the rear portion of the reinforcing frame 27.
An operation unit 35 that controls a boom, a bucket, and the like is provided at the front portion of the backhoe 14 , and this operation unit 35 can be operated by sitting on the driver's seat 12 that is turned backward and forward by the driver. .
In the transmission case 23, there is a main clutch for connecting / disconnecting power from the engine 22, a sub-transmission mechanism for continuously shifting the power transmitted from the main clutch, and a PTO for shifting engine power and transmitting it to the PTO shaft. A transmission mechanism and the like are incorporated.
[0013]
1 to 7, an engine start switch (starter switch) 2 for starting the engine 22 as a key is arranged in a control unit 32 in a general tractor, but here, between the driver seat 12 and the rear wheel fender 13. Are arranged in an operation box 38 provided in The operation box 38 is attached to the surface of the rear wheel fender 13 on the driver's seat 12 side, and the engine start switch 2 is provided on the upper portion thereof. Easy to operate.
In the operation box 38, a shift lever 5, a PTO lever 9, a hand accelerator lever 39, a hydraulic control lever 40, and the like are guided. The hand accelerator lever 39 is connected to the engine 22 side, and the hydraulic control lever 40 can control the hydraulic device 29.
[0014]
The PTO lever 9 is located in the vicinity of the engine start switch 2 and can be connected / disconnected (and shifted) of the PTO power via the PTO transmission mechanism. When the PTO lever 9 is turned off, the PTO sensor 10 Is detected.
The transmission lever 5 is a sub-transmission switching lever that switches the sub-transmission mechanism into three stages of high, middle, and low, and is attached to a shifter operation operating shaft 41 supported by the casing of the hydraulic device 29 as shown in FIGS. . A support plate 42 that rotates integrally with the speed change 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 come into contact with the ball 6a of the speed change sensor 6. ing.
[0015]
The sub-transmission mechanism can be set to a neutral state 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. Detect neutral state.
The arc plate 43 is formed with a hole 43a that engages with the ball 6a when the transmission lever 5 is in the neutral position (or in the high, middle, and low three positions). The hole 43a has a larger diameter than that of the prior art, and is formed, for example, in a size 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 backlash and tolerance, and the speed change sensor 6 is positioned on the casing of the hydraulic device 29 via the bracket 44. It is mounted so as to be adjustable, and the position can be adjusted with the bracket 44 or the position can be adjusted with a shim.
[0016]
However, the position where the shift sensor 6 is attached is narrow, making it difficult to adjust the position. In addition, there are many variations by the adjustment operator, and it may be difficult to operate the shift sensor 6 properly.
Therefore, as described above, the diameter of the hole 43a is increased with respect to the ball 6a to make rough engagement, so that the play is absorbed by the hole 43a, and the adjustment work at the time of assembly is facilitated. The variation due to is reduced.
1 and 6, the clutch pedal 3 is pivotally supported on a support base 46 that supports the control unit 32 behind the engine 22, and this clutch pedal 3 is basically in a position where the main clutch is connected. The clutch can be disengaged by depressing the pedal. When the clutch pedal 3 is depressed, the arm 47 operates the clutch sensor 4 so that it can be detected that the main clutch is in the clutch disengaged state.
[0017]
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 depressing it forward and backward, the HST (hydrostatic transmission) is operated, and the tractor 21 is without permission. Move forward or backward while shifting.
The travel operation pedal 7 is connected to the swash plate shaft of the HST via a link 49, a bell crank 50, and the like, and a travel system sensor 8 that contacts the bell crank 50 is attached to the side surface of the transmission case 23.
The traveling system sensor 8 detects a neutral position when the traveling operation pedal 7 is not depressed, and detects a neutral state of the HST.
[0018]
FIG. 2 shows an electric circuit (safety circuit) of the engine start switch 2, the clutch sensor 4, the shift sensor 6, the travel system sensor 8, and the PTO sensor 10 as a logic circuit. Is connected to a logical OR (OR) element A. When at least one of them is in a detection state, a true output is output and the signal is sent to a logical AND (AND) element B.
A traveling system sensor 8 and a PTO sensor 10 are connected to the logical AND (AND) element B, and at least one of the clutch sensor 4 and the shift sensor 6 and the traveling system sensor 8 and the PTO sensor 10 are in a detection state. In this state, a true output signal is output, and the engine can be started by operating the engine start switch 2 in that state.
[0019]
Therefore, when starting the engine 22 of the tractor / loader / backhoe 1 when sitting in the forward-facing driver's seat 12 and starting the engine, the driver sets the traveling operation pedal 7 and the PTO lever 9 to the neutral state, and the clutch pedal 3 Or by setting the speed change lever 5 to the neutral state, the engine can be started by the engine start switch 2, and when the driver's seat 12 is reversed in the backward position, the driver However, the engine start switch 2 can be used to start the engine by setting the transmission lever 5, the travel operation pedal 7 and the PTO lever 9 to the neutral state.
[0020]
Since the engine start switch 2 is in the vicinity regardless of whether the driver's seat 12 is directed forward or backward, the engine start switch 2 can be easily operated. The travel operation pedal 7 is in a neutral state unless the pedal is depressed, and the PTO sensor 10 is logically connected to the clutch sensor 4. Although it can be connected by the sum element A, it is not preferable because the PTO shaft rotates when the main clutch is engaged after starting the engine with the clutch sensor 4 in a neutral state in a forward attitude.
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 subtransmission mechanism is not used at all, so the transmission lever 5 is disposed in the neutral position, and the transmission lever 5 is moved to the neutral position when the engine is started. Not much happens.
[0021]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation can be carried out. For example, the tractor / loader / backhoe 1 is illustrated, but another rear working machine may be mounted on the tractor 21, or the front loader or the tractor 21 not mounted with the rear working machine may be used. The invention can be applied.
In addition, a transmission that does not use the HST may be provided with a main transmission lever, a super deceleration lever, a forward / reverse switching lever, etc. in addition to the auxiliary transmission lever. A sensor may be connected to the OR element A.
[0022]
【The invention's effect】
According to the present invention described in detail above, the engine can be started 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. Therefore, even if the clutch pedal 3 is not turned off, the engine can be started if the speed change lever 5 is in the neutral state, and the engine start switch 2 can be operated even when sitting in the backward driver seat 12, While sitting in the rearward 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 an explanatory perspective 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 an operation box.
FIG. 4 is a sectional side view of a speed change lever and a speed change 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 vehicle body 12 Driver's seat 13 Rear wheel fender 14 Backhoe Machine)
21 Tractor 38 Operation box A OR element B AND element

Claims (1)

A driver's seat that can be flipped back and forth is arranged at the rear upper part of the tractor body, rear wheel fenders are arranged on the left and right sides of the driver's seat, a backhoe that is operated from the rear driver's seat is installed at the rear of the tractor body, and an engine start switch A clutch sensor for detecting the clutch pedal disengagement state, a shift sensor for detecting the neutral state of the shift lever, a travel system sensor for detecting the neutral state of the travel operation pedal, and a PTO sensor for detecting the disengagement state of the PTO lever The engine start switch and the shift lever are arranged in the vicinity of the rearward driver seat and between the rear wheel fenders, and the clutch sensor is in a non-detection state when the driver seat is rearwardly arranged. a traveling system sensors and PTO sensor is a detection state and when the shift sensor is in the detection state, e by the engine start switch Engine starting device of a tractor, characterized in that to allow gin startup.

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