JPH078003A - Agricultural work vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to allow a transmission gear to be compactly installed inside a mission case of a limited size and to easily configure a gear shift operation member. [Structure] Outer cylinder shaft (41) of mission case (3)
The meshing speed change gears (38) to (40) are rotatably supported on the upper side via ball clutches (35) to (37), and the inner shaft ( The inner shaft (45) is provided with a protrusion (46) through which the ball clutch (35) is inserted and which engages the ball clutches (35) to (37), and one end of the inner shaft (45) is projected to the outside of the mission case (3). The operating members (49) and (50) are attached.

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 a rotary working machine and used for cultivating work or the like.

[0002]

2. Description of the Related Art Conventionally, there has been a technique for providing a multi-stage forward and reverse output with a main transmission mechanism and an auxiliary transmission mechanism in a traveling mission of a general-purpose management machine.

[0003]

In the prior art, when a transmission gear is pivotally supported by a transmission shaft of a transmission case via a ball clutch, a fork shaft having a shifter is inserted at a shaft center position of the transmission shaft. It is necessary to mount pins, shifter bosses, shifter forks, etc., which are the operation members of the fork shaft, around the shift shaft, and the shifter boss is mounted adjacent to the shift gear, which significantly restricts the internal structure of the mission case and downsizes the mission case. In addition, it is not possible to easily increase the number of gears, etc., and the operation member of the fork shaft is composed of a combination of multiple parts, which makes it difficult to improve the operation efficiency of the fork shaft and reduce the manufacturing cost. was there.

[0004]

SUMMARY OF THE INVENTION However, according to the present invention, the transmission gear is always supported on the outer cylinder shaft of the transmission case through the ball clutch so as to be engageable and disengageable, and the axial center position of the outer cylinder shaft is set. An inner shaft is slidably inserted into the inner shaft, and a projection for engaging the ball clutch is provided on the inner shaft, and one end side of the fork shaft is projected to the outside of the transmission case and an operation member is attached to the transmission gear. The space inside adjacent mission cases can be effectively used, the mission cases can be downsized and the number of gears can be increased easily, and the operation members can be easily configured with a simpler structure and a smaller number of parts. In addition, it is possible to easily improve the operation efficiency of the inner shaft and reduce the manufacturing cost.

Further, the transmission gear is constantly supported on the outer cylinder shaft of the transmission case via a ball clutch in a freely disengageable manner, and the inner shaft is slidably inserted at the axial center position of the outer cylinder shaft. , A projection that engages a ball clutch is rotatably attached to the inner shaft, and since the rotation break occurs between the inner shaft and the projection, the rotation break structure such as a shifter fork and shifter boss is unnecessary, and the mission It is possible to easily secure the space inside the case, reduce the manufacturing cost, etc., and since the inner shaft does not rotate, it is possible to easily simplify the inner shaft operating mechanism and improve the operating efficiency.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is an explanatory view of an auxiliary transmission mechanism portion, FIG. 2 is a side view of a management machine, FIG. 3 is a plan view thereof, FIG. 4 is an explanatory view of a mission case upper portion, FIG. 5 is an explanatory view of a lower portion thereof, and FIG. 6 is a main transmission mechanism. 7 is a side view of the upper part of the mission case, in which (1) is an engine, (2) is an engine stand on which the engine (1) is mounted, (3) is the engine stand (2) on the front side. A transmission case fixed to the transmission case, (4) a pair of left and right traveling wheels mounted on both sides of the transmission case (3) via axles (5), and (6) attached to the transmission case (3) via a hitch (7). Rotary work machine to be connected by traction,
(8) is a steering handle which is connected to the upper part of the mission case (3) through a handle base (9), and (10).
Is a main speed change lever supported on the mission case (3) so as to be swingable forward and backward, (11) is an auxiliary speed change lever provided on the steering handle (8), (12) is a pair of left and right side clutch levers, and (13) ) Is a traveling clutch lever, which is provided between the output pulley (14) of the engine (1) and the input pulley (15) of the transmission case (3) via the traveling clutch tension roller (16).
7) is stretched, the output of the engine (1) is transmitted to the mission case (3), and the rotary pawl (18) of the rotary working machine (6) is rotated to perform plowing work. .

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), and a shift fork (22). A fork shaft (23) for sliding a main transmission gear (19) through a counter shaft, a counter shaft (25) provided with a reverse gear (24), first forward speed and second speed gear (26)
The main gear shaft (28) provided with (27) is rotatably supported by the transmission case (3), and the first gear (26) which is rotatably rotatably supported by the main gear shaft (28) is provided on the counter shaft (25). 29) and (30) are connected, and the counter shaft (2
5) to the main transmission shaft (28) counter gear (31) (3
2) to form a main transmission mechanism (33) having two forward gears and one reverse gear. The main gear shift lever (10) is connected to the fork shaft (23) through the shift arm (34). The reverse gear (24), the first gear (26) or the second gear (27) is operated to operate the main shift lever (10) for selectively meshing the shift gear (19).

Further, as shown in FIGS. 1, 4, and 6, a low-medium-speed gear (38) which is a continuously variable transmission gear that is engaged and disengageable via ball clutches (35) (36) (37).
(39) (40) Auxiliary transmission shaft (4
1) is rotatably supported on the mission case (3), and the gears (38) to (40) are constantly meshed with the low, medium and high speed output gears (42) (43) (44) of the main transmission shaft (28). , A projection that allows the fork shaft (45), which is an inner shaft, to be slidably inserted into the axial center position of the sub-transmission shaft (41) to selectively engage the ball clutches (35) to (37). The shifter (46) is provided on the fork shaft (45) to form a three-step auxiliary transmission mechanism (47) for low, medium and high speeds. The fork shaft (45) is slid in the axial direction to shift the shifter (46). And the low, medium and high speed gears (38) to (40) are moved through the ball clutches (35) to (37) to move the auxiliary transmission shaft (41).
Is selectively engaged to switch between low speed, medium speed and high speed output.

Further, as shown in FIGS. 1, 4, 7, 8 and 9, a compression spring (48) is wound around one end of the fork shaft (45), and the other end of the fork shaft (45) is closed. The end of the transmission case (3) is provided so as to project in and out of the transmission case (3), and a cylindrical fixed cam (49) and a rotating cam (50) are provided.
Attach the fixed cam (49) via the fixed cam (49)
A rotary cam (50) is inserted through a screw (52) and a nut (53) at an end of a fork shaft (45) through which a central portion is loosely fitted and inserted.
Rotatably attached to the rotary cam (50) by integrally fixing the auxiliary gearshift arm (54) to the auxiliary gearshift lever (1).
1) via an auxiliary transmission wire (55) and a return spring (55a) connected to the arm (54), and a low, medium and high speed cam floor flat surface (of a fixed cam (49) formed in multiple stages ( The cam flat surface (59) of the rotary cam (50) is made to face 56, 57, and 58, and the rotary cam (50) is rotated around the fork shaft (45) by the operation of the auxiliary speed change lever (11). The cam flat surface (59) is selectively brought into contact with any of the flat surfaces (56) to (58) of the medium- and high-speed cam floors to advance the fork shaft (45) against the compression spring (48), and also the spring. The fork shaft (45) is retracted by (48), and the low, medium and high speed output switching is performed by the shifter (46).

Further, as shown in FIGS. 4, 5 and 7, a sprocket (60) is integrally formed on the sub-transmission shaft (41), and ball clutch type side clutches (61) (6).
The sprocket (63) is pivotally supported on the axle (5) via the (2), and each sprocket (60) (63) is attached to the chain (6).
4) and the side clutch (6
1) Side clutch arms (67) and (67) for turning off (62) against springs (65) and (66) are provided, and the side clutch lever (12) is provided with a side clutch wire (68) via a side clutch wire (68). The clutch arm (67) is connected, and the side clutches (61) (62) are disengaged by operating the lever (12).

As is clear from the above, the ball clutch (3) is mounted on the auxiliary transmission shaft (41) of the mission case (3).
5) to (37), the low, medium and high speed gears (38) to (40), which are transmission gears, are rotatably supported, and the fork shaft (45) is placed at the axial center position of the auxiliary transmission shaft (41). ), And a shifter (46) for engaging the ball clutches (35) to (37) is rotatably attached to the fork shaft (45), and one end of the fork shaft (45) is attached to the mission case (3). A fixed cam (49) and a rotary cam (50), which are operation members, are attached so as to project to the outside, and the sprocket (60) of the fork shaft (41) is arranged substantially in the left-right width center of the mission case (3). Then, on the left half of the fork shaft (41), the gears (38) to (4) for low, medium and high speed are provided.
0) is mounted to secure a peripheral space in the right half of the fork shaft (41) to dispose the main transmission first speed gear (26) and the second speed gear (27), and the fork shaft (4).
Since the fork shaft (45) does not rotate due to the rotation break between the 5) and the shifter (46), the operation efficiency is good and the number of parts is small as compared with the conventional operation means such as the shifter boss and the shifter fork. Cam (49) (50)
Fork shaft (45) by mission case (3)
It is configured to be switched from the outside.

[0012]

As is apparent from the above embodiments, the present invention is such that the transmission gear (38) is always meshed on the outer cylinder shaft (41) of the transmission case (3) via the ball clutches (35) to (37). ) To (40) are detachably supported, and the inner shaft (45) is slidably inserted into the axial center position of the outer cylinder shaft (41) to engage the ball clutches (35) to (37). The inner shaft (45) is provided with a projection (46) for a combined operation, and one end side of the inner shaft (45) is projected to the outside of the mission case (3) to which the operating members (49) (50) are attached. The internal space of the mission case (3) adjacent to the transmission gears (38) to (40) can be effectively used, and the mission case (3) can be downsized and the number of gears can be increased easily. Member (49) (5
0) can be easily constructed with a simpler structure and a smaller number of parts than the conventional one, and it is possible to easily improve the operation efficiency of the inner shaft (45) and reduce the manufacturing cost.

Further, on the outer cylinder shaft (41) of the transmission case (3), continuously meshed transmission gears (38) to (40) are rotatably supported on the outer cylinder shaft (41) via ball clutches (35) to (37). At the same time, the inner shaft (45) is inserted into the axial center position of the outer cylinder shaft (41), and the ball clutches (35) to (3).
A protrusion (46) that engages 7) is rotatably attached to the inner shaft (45), and the inner shaft (45) and the protrusion (4)
Since the rotation break is performed between 6), the rotation break structure such as a shifter fork and a shifter boss is not required, and it is possible to easily secure the internal space of the mission case (3) and reduce the manufacturing cost. Axis (4
Since 5) does not rotate, the inner shaft (45) operating mechanism can be simplified and the operating efficiency can be easily improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an auxiliary transmission mechanism 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 diagram of the upper part of the mission case.

FIG. 5 is a lower part explanatory view of the same.

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

FIG. 7 is a side view of the upper part of the mission case.

FIG. 8 is an exploded view of an auxiliary shift cam portion.

FIG. 9 is an explanatory diagram of the same development.

[Explanation of symbols]

 (3) Mission case (35)-(37) Ball clutch (38)-(40) Low / medium / high speed gear (shift gear) (41) Auxiliary shift shaft (outer cylinder shaft) (45) Fork shaft (inner shaft) (46) Shifter (projection) (49) Fixed cam (operating member) (50) Rotating cam (operating member)

Claims (2)

[Claims] Claim: What is claimed is: 1. A transmission gear, which is always meshed with the outer cylinder shaft of a transmission case, is rotatably supported by a ball clutch, and an inner shaft is slidably inserted in the axial position of the outer cylinder shaft. An agricultural work vehicle characterized in that a projection for engaging the ball clutch is provided on the inner shaft, and one end side of the inner shaft is projected to the outside of the mission case to attach an operating member. 2. A transmission gear is constantly supported on the outer cylinder shaft of the transmission case via a ball clutch so as to be engageable and disengageable, and an inner shaft is slidably inserted at the axial center position of the outer cylinder shaft. An agricultural work vehicle characterized in that a projection for engaging a ball clutch is rotatably attached to an inner shaft.