JP2503723B2 - Running car body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a traveling vehicle body of an agricultural work machine used by mounting a work machine portion such as a rice transplanter.

[Prior Art] There is a traveling vehicle body such as an agricultural work machine configured to transmit transmission from an engine to a mission via a drive unit of a hydraulic device.

[Problems to be Solved by the Invention] As a traveling vehicle body of this kind, there is one in which a clutch is provided in a transmission path from a hydraulic device to a transmission (Japanese Patent Laid-Open No. 62-62160)
-234784), but with such a configuration, the starting torque of the engine is large, and a high torque starter is required.
There is a problem of high cost. There is also a clutch provided in the transmission path from the engine to the hydraulic system (Japanese Patent Laid-Open No. 227426/1988). However, in this configuration, when the clutch is disengaged, the hydraulic system acts as a brake, so There was a danger of deceleration and sudden stop, which was dangerous. An object of the present invention is to solve the problems of the conventional device as described above.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration.

That is, in the traveling vehicle body according to the present invention, in the traveling vehicle body configured to transmit the transmission from the engine to the transmission via the drive device of the hydraulic device, the transmission path is intermittently connected to the transmission path from the engine to the hydraulic device. One of the features is that one clutch is provided and a second clutch that continues the transmission is provided in the transmission path from the hydraulic device to the mission.

[Operation] The engine starting torque can be reduced by operating the first clutch to cut off the transmission to the hydraulic system, and the second clutch can be operated to reverse the drive from the transmission by inertial running when the clutch is released. As a result of the interruption before transmission to the device, abrupt deceleration is prevented.

[Examples] Examples described in the drawings will be described below.

The traveling vehicle body 1 is for an agricultural working machine, and a linking device 3 provided at the rear portion of the machine body is used by mounting a working machine part such as a rice transplanter. The traveling vehicle body 1 is provided with a mission case 6 and an engine 7 on the front and back on a frame 5 having a frame shape in a plan view, and a front case 10 and a front wheel support case 10 and a final case 9 provided on the rear side of the mission case. Is rotatably mounted, and the front wheels 11, 11 are rotatably supported on the rear wheel support case 13, 13 which is provided at the rear end of the frame 6 so as to be freely rotatable. Has been done.

A hydraulic pump 20 is installed in a space between the mission case 6 and the engine 7.
Engine 7 and hydraulic pump 20 to mission input shaft 2
1, an engine output shaft 22 and a pump drive shaft (counter shaft) 23 are provided on the same side. A belt 27 is wound around a pulley 25 attached to the engine output shaft and a pulley 26 attached to the counter shaft. The transmission portion by the belt 27 is configured as a first clutch, and presses the tension roller 28 against the belt 27 to drive the engine output shaft 22.
From the engine output shaft 22 to the counter shaft 23 by releasing the pressing of the tension roller 28 against the belt 27 so that the clutch can be switched to the disengaged state. It has become.
The drive mechanism of the tension roller 28 is constructed as shown in FIG. That is, the tension roller 28 is supported by a roller support rod 30 that is rotatably provided, and the belt 27 is supported by a spring 32 attached to an arm 31 that is integral with the support rod.
Is biased to the side that presses. Further, a rear end portion of an operation wire 33 stretched back and forth is connected to the arm 31. The front end of the operating wire 33 is connected to the left and right brake pedals 35.
It is connected to a rotatable arm 37 provided below a brake pedal shaft 36 that supports a and 35b. A swing rod support rod 39 is attached integrally with the arm 37, and the left and right ends of the swing rod support rod 39 are attached to the brake pedals 35a, 35b.
A swinging rod 40 is swingably attached so as to be in contact with the lower surface of the. Normally, the tension roller 28 is pressed against the belt 27 by the spring 32, so that the clutch is engaged.However, when the left and right brake beldals 35a and 35b are stepped on simultaneously, the operation wire 33 is pulled and the force of the spring 32 is pulled. The arm 31 and the roller support rod 30 are rotated against this, the tension roller 28 is separated from the belt 27, and the belt 27 is loosened, and the clutch is disengaged. When only one of the brake pedals is depressed, the swing rod 40 swings and the action is not transmitted to the swing rod support rod 39, so the wire 33 is not pulled and the clutch is not disengaged.

Between the counter shaft 23 and the mission input shaft 21, a belt-type auxiliary transmission device 42 that also serves as a second clutch is provided.
In this auxiliary transmission 42, belts 46a and 46b are stretched around pulleys 43a and 43b having the same diameter attached to a counter shaft and pulleys 44a and 44b having different diameters attached to a transmission input shaft, and tension pulleys 47a and 47b are stretched. Then, either of the belts (46a, 46b) is tensioned to perform low speed or high speed transmission, or both belts are slackened to switch to a clutch disengaged state in which transmission is stopped.

As shown in FIG. 4, the engine 7 is provided with a recoil starter 50 for starting, and a knob 52 attached to the tip of a rope 51 extended from this is provided on the floor. This knob 52 is provided on the floor. The engine is started by pulling up the knob 52 quickly. When the engine is started, the left and right brake pedals 35a and 35b are stepped on at the same time, and the belt 27 that is configured as a sub clutch is
It is recommended to keep the clutch disengaged. When the belt 27 is in the clutch-engaged state, the hydraulic pump 20 must be turned at the time of engine startup, and a large force is required to pull up the knob 52.However, when the belt 27 is in the clutch-disengaged state. Since the hydraulic pump 20 does not rotate, the knob 52 can be easily lifted.

During normal work, the rotational power of the engine output shaft 22 is transmitted to the counter shaft 23 via the belt 27 and to the mission input shaft 21 via the belt 46a (or 46b) of the auxiliary transmission. Then, it is transmitted from the mission case 6 to the front wheels 11 and 11 and the rear wheels 14 and 14 as a traveling output, and is also transmitted to a working machine portion as a work output.
A main mission 55 is provided inside the mission case 6 so that the traveling speed can be switched between three stages of a high speed "road traveling speed", a low speed "field working speed" and a "reverse speed". . This main shift operation is performed by the main shift lever 57 provided along the steering post cover 56.

FIG. 5 shows the operation portion of the main shift lever. A crank-shaped guide groove 58 for guiding the main transmission lever 57 is provided, along which a road traveling speed F2, a neutral N, a field working speed F are provided.
1, each shift position of reverse speed R is set. As shown in the figure, the field work speed F1 is provided in the crank portion at the center of the groove, so that the main shift lever 57 can be operated quickly and reliably when shifting from another shift to the field work speed F1. . In the case of agricultural work machines, the field work speed F1 is used most frequently, so it is important to consider the change to the field work speed F1 primarily. Also, the field work speed
Since F1 and the reverse speed R are juxtaposed in the same row, the operation range of the main shift lever 57 in the field is clarified, and erroneous operation is prevented and the operation is facilitated.

[Effects of the Invention] As described above, the traveling vehicle body according to the present invention is
When the engine is started, the first clutch is operated to discontinue the transmission to the hydraulic system, so that the engine starting torque can be reduced and the engine startability is improved. Also, in the clutch operation during traveling, by operating the second clutch, the reverse drive due to inertial traveling when the clutch is disengaged is interrupted before being transmitted from the mission to the hydraulic system, so that rapid deceleration is prevented and smooth It became possible to stop easily and maneuverability and safety were improved.

[Brief description of drawings]

FIG. 1 is a side view of one embodiment of a traveling vehicle body according to the present invention,
2 is a plan view of a main part, FIG. 3 is an explanatory view of a clutch transmission mechanism, FIG. 4 is an explanatory view of a recoil starter, and FIG. 5 is an explanatory view of an operating portion of a main shift lever. 1 ... Running vehicle, 6 ... Mission case, 7 ... Engine, 11 ... Front wheel, 14 ... Rear wheel, 20 ... Hydraulic pump, 21
...... Mission input shaft, 22 …… Engine output shaft, 23 ……
Counter shaft, 27, 46a, 46b …… Belt, 28 …… Tension roller, 50 …… Recoil starter, 57 …… Main shift lever.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seike Rihaku No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture, Engineering Department, Iseki Agricultural Machinery Co., Ltd. Technical Department Co., Ltd. (72) Inventor Hitoshi Yamazaki 1 Yakura, Tobe-cho, Iyo-gun, Ehime Pref., Technical Department, Iseki Agricultural Machinery Co., Ltd. (56) References: Development 55-33829 (JP, U) Development 63-93223 JP, U) Actual development Sho 63-148520 (JP, U) Japanese Patent Sho 57-20171 (JP, B2)

Claims (1)

(57) [Claims] 1. A traveling vehicle body in which transmission from an engine to a transmission is transmitted via a drive device of a hydraulic system, and a first clutch for interrupting the transmission is provided in a transmission path from the engine to the hydraulic system. A traveling vehicle body having a second clutch for connecting and disconnecting the transmission in the transmission path from the hydraulic device to the mission.