JP3306498B2 - Agricultural work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work vehicle equipped with, for example, a rotary work machine for tilling work.

[0002]

2. Description of the Related Art Conventionally, in a traveling mission of a general-purpose management machine, there has been a technique of providing a main transmission mechanism for performing forward / reverse switching and a sub-transmission mechanism for performing acceleration / deceleration switching to obtain a plurality of stages of forward / reverse output.

[0003]

According to the prior art, when a rotary work machine for performing a tilling operation by rotating a rotary claw is mounted, the traveling clutch can be disengaged and the main speed change can be performed during the tilling operation. Each operation of reverse switching, stopping the rotary pawl, and connecting the traveling clutch is necessary. To return to the tilling operation, disconnect the traveling clutch, switch the main speed to the working speed, rotate the rotary pawl, and connect the traveling clutch. Each operation is necessary, and even when it is necessary to return the body a little during the tilling operation, the operation is extremely troublesome, and there is a problem in handling operation such that the rotary claw is easily moved backward without stopping. In addition, there is a conventional technology in which the PTO clutch is automatically disengaged by the reverse operation of the main transmission mechanism to stop the rotary claw. However, in this technology, it is not possible to perform the plowing operation by the reverse movement, and for example, the steering wheel is moved. There is a problem that the backward movement of the management machine, which can perform the work in the posture shifted to the front of the aircraft, is restricted.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to an agricultural work vehicle having a main transmission mechanism for switching between forward and reverse and an auxiliary transmission mechanism for switching between acceleration and deceleration. The auxiliary transmission mechanism is provided with an interlocking member for disengaging the PTO clutch for PTO output disconnection in conjunction with the reverse output operation by the reverse rotation switching means. In any case of the reverse movement, the vehicle can be moved in the reverse direction via the reverse rotation switching means of the auxiliary transmission mechanism, and the PTO clutch is automatically disengaged during the reverse movement by the reverse rotation switching means, and the aircraft is slightly returned during the agricultural work. Operation can be simplified as compared with the conventional case, and handling operability and safety can be easily improved. Compared to techniques in which the forward switching and similar work of the main transmission can be easily performed to the reverse switching.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an explanatory view of a PTO clutch section, FIG. 2 is a side view of a management machine, FIG. 3 is a plan view of the same, FIG. 4 is an explanatory view of an upper portion of a transmission case, FIG. FIG. 7 is an upper side view of a transmission case, in which (1) is an engine, (2) is an engine mount on which the engine (1) is mounted, and (3) is an engine mount (2) on the front side. A transmission case to be fixed, (4) is a pair of right and left running wheels mounted on both sides of the transmission case (3) via an axle (5), and (6) is towed to the transmission case (3) via a hitch (7). Rotary work machine to be connected,
(8) a steering handle connected to the upper part of the transmission case (3) via a handle base (9); (10)
Is a main shift lever that is supported by the transmission case (3) so as to be able to swing back and forth, (11) is a sub shift lever provided on the steering handle (8), (12) is a pair of left and right side clutch levers, (13) ) Is a traveling clutch lever, which is provided between an output pulley (14) of the engine (1) and an input pulley (15) of the transmission case (3) via a traveling clutch tension roller (16).
7), the output of the engine (1) is transmitted to the transmission case (3), and the rotary pawl (18) of the rotary working machine (6) is rotated to perform the tilling operation. .

Further, as shown in FIGS. 4, 6, and 7, an input shaft (21) provided with an input pulley (15), a main transmission gear (19) and a PTO output pulley (20) on a shaft core.
A fork shaft (23) for sliding a main transmission gear (19) via a shift fork (22), a counter shaft (25) provided with a reverse gear (24), forward first and second speed gears (26) ( 27), the main transmission shaft (28) is rotatably supported by the transmission case (3), and the first speed gear (26) rotatably supported by the main transmission shaft (28) is mounted on the counter shaft (25) by the counter gear (29). ) (30), the counter shaft (25) is connected to the main transmission shaft (28) by the counter gear (31).
(32) to form a main transmission mechanism (33) having two forward steps and one reverse step. The main transmission lever (10) is connected to the fork shaft (23) via a shift arm (34). The main transmission lever (10) is operated to selectively engage the transmission gear (19) with the reverse gear (24) or the first gear (26) or the second gear (27).

Further, as shown in FIGS. 4, 6, and 7, low, medium, and high speed gears (39), (40), (40) and (35) are removably engaged via ball clutches (35), (36), (37), and (38). 41)
And an auxiliary transmission shaft (4) provided with a reverse sprocket (42).
3) is rotatably supported by the transmission case (3), and the gears (39) to (41) are always meshed with the low, medium, and high speed output gears (44), (45), and (46) of the main transmission shaft (28). In addition, a reverse rotation sprocket (42) is always connected to a reverse rotation output sprocket (47) of the main transmission shaft (28) via a reverse rotation chain (48) serving as a reverse rotation switching means, and a sub transmission shaft (4).
The fork shaft (49) is slidably inserted into the shaft center position of 3), and the shifter (50) for selectively engaging each of the ball clutches (35) to (38) is rotated around the fork shaft (49). 4 speed auxiliary transmission mechanism for reverse rotation and low / medium / high speed (5
1), the fork shaft (49) is slid in the axial direction to displace the shifter (50), and the low, medium and high speed gear (3) is displaced via the ball clutches (35) to (38).
9) to (41) and the reverse rotation sprocket (42) are selectively engaged with the auxiliary speed change shaft (43) to perform reverse rotation and low / medium / high speed output switching.

Further, as shown in FIGS. 4, 5 and 8, a sprocket (52) is formed integrally with the auxiliary transmission shaft (43), and a ball clutch type side clutch (53) (5) is formed.
The sprocket (54) is supported on the axle (5) via 3), and each sprocket (52) (54) is connected to the chain (5).
5) and the side clutch (5)
3) A side clutch arm (57) (57) for disengaging the (53) against the springs (56) (56) is provided, and the side clutch lever (12) is connected to the side clutch wire (58) via a side clutch wire (58). The clutch arm (57) is connected, and the side clutches (53) (53) are disengaged by operating the lever (12).

Further, as shown in FIGS. 8 and 9, a fork shaft (4) projecting outside the transmission case (3) is provided.
9) A sub-transmission arm (60) that engages one end with a notch (59) at the end, and a sub-transmission that connects the one end to the sub-transmission lever (11) by providing a bracket portion of the hitch (7) as an outer support. Wire (61) and the auxiliary transmission wire (6
1) a sub-transmission switching arm (62) for connecting the other end of the sub-transmission arm (60) and the sub-transmission switching arm (62);
The arm (60) is connected to a fulcrum plate (65) on the side surface of the transmission case (3) via fulcrum shafts (66) and (67).
(62) is swingably mounted on the fulcrum shaft (66) (67)
Return springs (68) and (69) wound around each arm (6)
0) and (62).
1) By operating the arms (60) and (62) against the return springs (68) and (69), the fork shaft (4) is swung.
9), the arms (60) and (62) are swung in opposite directions by return springs (68) and (69) to retract the fork shaft (49), and the shifter (49) of the fork shaft (49) 50) is slid in the axial direction to switch the sub-transmission.

Further, as shown in FIGS. 1, 10 and 11, the PTO shaft (70) is coaxial with the input shaft (21) for supporting the input pulley (15) and the main transmission gear (19).
And a PTO output pulley (2) is attached to the PTO shaft (70).
0), and the shafts (21) and (70) are connected to each other via splines (71) and (72) so as to be freely connectable.
An O-clutch (73) is provided, a clutch shifter (75) is slidably provided on the auxiliary transmission shaft (43) via a shifter pin (74) for abutting the fork shaft (49), and a transmission case (3) is provided. ), A clutch shifter (75) is connected to a PTO clutch (73) via a clutch arm (77), which is an interlocking member provided swingably via a fulcrum shaft (76), and a clutch arm (77).
The main transmission mechanism (33) is provided in an agricultural work vehicle including a main transmission mechanism (33) for switching between forward and reverse and an auxiliary transmission mechanism (51) for performing acceleration / deceleration switching. Reversing chain (4)
8) is provided in the auxiliary transmission mechanism (51), and a clutch arm (77) for disengaging the PTO output disconnection PTO clutch (73) in conjunction with the reverse rotation output operation by the reverse rotation chain (48) is provided. .

Then, as shown in FIG. 10, by operating the sub-transmission lever (11), one of the low, medium and high speed gears (39) to (41) is moved via the shifter (50) to the ball clutches (35) to (41). When engaged with the auxiliary transmission shaft (43) by (37), the PTO clutch (7) is moved through the clutch arm (77) held backward by the return spring (78).
3) is engaged and connected to the input shaft (21) and the PTO shaft (70), and the respective shafts (21) are connected by the PTO clutch (73).
(70) is connected and supported, the output of the engine (1) is output to the rotary work machine (6) side via the PTO shaft (70), and the rotary pawl (18) is driven to perform the tilling work. By operating the sub-transmission lever (11), the reverse rotation sprocket (42) is engaged with the sub-transmission shaft (43) by the ball clutch (38) via the shifter (50).
When the main transmission output is output in reverse, the ball clutch (3
The tip of the fork shaft (49) that engages the engaging arm (8) abuts the shifter pin (74), slides the clutch shifter (75), and opposes the return spring (78) to the clutch arm (7).
7) is rocked, the PTO clutch (73) is disengaged, the engine (1) output to the PTO shaft (70) is stopped, and the rotary pawl (18) of the rotary working machine (6) is stopped. In response to the no-clutch operation of the auxiliary transmission lever (11), the reverse rotation is output via the reverse rotation chain (48), and the clutch arm (7) is operated in conjunction with the reverse rotation output operation.
7), the PTO clutch (73) is disengaged to stop the rotary pawl (18). For example, when the main shift is forward, the reverse shift output of the sub shift is used to move backward, and when the main shift is reverse, the It is configured to advance by reverse rotation of the gear shift, and to reverse when the rotary claw (18) is stopped when it is desired to slightly return the body during forward or reverse work.

[0012]

As is apparent from the above embodiments, the present invention provides a main transmission mechanism (33) for switching between forward and reverse travel,
In an agricultural work vehicle provided with an auxiliary transmission mechanism (51) that performs acceleration / deceleration switching, a reverse rotation switching means (48) that reverses the traveling output of the main transmission mechanism (33) is provided in the auxiliary transmission mechanism (51), and the reverse rotation switching is performed. The PTO clutch (73) for disconnecting the PTO output in conjunction with the reverse rotation output operation by the means (48)
An interlocking member (77) for disengaging the main transmission mechanism (33) is provided through the reverse rotation switching means (48) of the sub transmission mechanism (51) regardless of whether the main transmission mechanism (33) is moving forward or backward. The PTO clutch (73) is automatically disengaged during the reverse movement by the reverse rotation switching means (48), and the operation for slightly returning the aircraft during the agricultural work is simplified compared to the conventional operation. It is possible to easily improve the performance and safety, etc., and also to perform the same work as when switching the main speed forward when switching to the reverse, compared to the conventional technology in which the PTO output is stopped by the reverse switching of the main transmission. What can be done.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a PTO clutch unit.

FIG. 2 is a side view of the management device.

FIG. 3 is a plan view of the same.

FIG. 4 is an explanatory view of a transmission case upper part.

FIG. 5 is an explanatory view of the lower part.

FIG. 6 is an explanatory diagram of a main transmission mechanism.

FIG. 7 is an explanatory diagram of a subtransmission mechanism.

FIG. 8 is a top view of the transmission case.

FIG. 9 is an explanatory diagram of a sub-transmission arm portion.

FIG. 10 is a continuation explanatory view of a PTO clutch.

FIG. 11 is an explanatory diagram of a PTO clutch unit.

[Explanation of symbols]

 (33) Main transmission mechanism (48) Reverse rotation chain (reverse rotation switching means) (51) Sub transmission mechanism (73) PTO clutch (77) Clutch arm (interlocking member)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akihiro Matsumoto 5-32-7 Sendagaya, Shibuya-ku, Tokyo Inside Ishikawajima Shibaura Machinery Co., Ltd. (56) References Real Opening Sho53-112510 (JP, U) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) A01B 33/08 B60K 17/28 F16H 3/00

Claims (1)

(57) [Claims] An agricultural work vehicle having a main transmission mechanism for switching between forward and reverse and an auxiliary transmission mechanism for switching between acceleration and deceleration is provided with reverse rotation switching means for reversing the traveling output of the main transmission mechanism. And an interlocking member for disengaging the PTO output disconnection PTO clutch in conjunction with the reverse output operation by the reverse switching means.