JPH084807Y2 - Rotary work machine drive structure of hand tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rotary work machine drive structure for a hand tractor.

(B) Conventional technology A hand tractor constructed by distributing the working machine mounting part and the engine to the front side and the rear side of the traveling mission case located in the middle part in the front-rear direction of the machine body is used as a work purpose. Depending on the type of work machine, the work machine mounting section may be replaced and mounted. When the work machine is a drive-type rotary work machine (for example, a rotary tiller), the
In most of the cases, the rotary working machine is attached to and driven by the hand tractor by the connecting drive means as disclosed in Japanese Laid-Open Patent Publication No. 52-19843.

That is, as shown in FIG. 4, most of the conventional ones have the engine (b) mounted on the side opposite to the steering handlebar extended from the traveling mission case (a) and the steering handlebar extended. On the side, a hitch (c) is mounted on the traveling mission case (a), the front end of the frame of the rotary working machine (R) which is a drive type working machine is connected to the hitch (c), and the rotary working machine (R) is connected. ) Input shaft (d) and the PTO shaft (e) on the machine side are linked together by a removable transmission case (f) to reduce the transmission power to the rotary working machine (R). The transmission power is changed in the mission case by changing the gear transmission case (f) by turning it by 180 °, or by changing the gear transmission case (f) to a different gear ratio. However, in such a configuration, There is a problem with the front and rear weight distribution of the work machine side of the passive case becomes unbalanced, also,
When mounting the work implement, it takes time to properly match and connect the front end of the rotary work implement frame to the hitch (c), and the core of the rotary work implement input shaft (d) and PTO shaft (e) Since it is not easy to attach the variable speed transmission case (f) to match the distances, there is a problem that a great deal of labor is required to attach the working machine.

For this reason, among the conventional ones, the working machine connecting portions mounted on the main machine and the rotary working machine are fitted to each other in a spigot shape on the side where the steering handle is extended opposite to the engine mounting side. The front-rear direction tubular body, the hitch pin and the pin receiver which are provided on the upper side of the tubular body in the machine or the rotary working machine, and the latch fixing means provided on the lower side of the tubular body for the machine and the rotary working machine. The PTO shaft on the machine side and the input shaft on the rotary work machine side are concentrically arranged in the front-rear direction in both cylinders of the working machine connecting section, and the hitch pin is hooked to the pin receiver to lock the machine. When the cylinder and the cylinder on the rotary working machine side are joined together in a spigot shape, the input shaft on the rotary working machine side is connected to the PT on the machine side.
It can be seen that the rotary working machine is easily mounted by being configured to be automatically claw-engaged and interlocked with the O-axis (see, for example, Japanese Utility Model Publication No. Sho 53-20409).

(C) Problems to be solved by the device Although the latter of the conventional technologies described above is remarkably labor-saving in mounting the working machine as compared with the former, when mounting the working machine in the working machine, the working machine connecting portion is used. After hooking the hitch pin on the pin receiver, the lifting force must be applied to the steering hand rod to levitate the rotary working machine and join the cylinder on the machine side and the cylinder on the rotary working machine side in a spigot shape. However, the labor burden is heavy, and the joints of both cylinders tend to be misaligned, making it difficult to join them in a prescribed manner easily. There was a point.

Further, since various work machines are reattached to the work machine mounting portion for work, it is preferable that the rotary tractor is driven at a predetermined speed and the hand tractor main unit is advanced at a speed suitable for various works. However, since the conventional ones do not make this possible, there is a problem that work cannot be performed at an appropriate traveling speed depending on the mounting work machine.

(D) Means for Solving the Problems Therefore, in the present invention, when various work machines are attached and mounted, the machine body is advanced at an appropriate speed that matches each work machine and works well. The present invention provides a rotary work machine drive structure for a hand tractor, which is improved so that the work machine can be mounted much easier than the conventional work machine.

That is, in the rotary work machine drive structure of the hand tractor according to the present invention, the engine (2) and the work machine mounting section (6) are installed in the front and rear portions of the traveling mission case (1) in a distributed manner. ), A casing-shaped receiving portion for mounting the work connecting portion (6) located on the opposite side to the traveling mission case (1) side, and a casing-shaped receiving portion corresponding to the casing-shaped receiving portion mounted on the rotary working machine (R) side. Connected part (36) and work machine mounting part (6)
Hitch pins (54) and pin receivers (55) that are on the upper side of the traveling mission case (1) and on the rotary working machine (R), and on the lower side of the working machine mounting section (6) It is composed of a mission case (1) and a latch fixing means provided on the rotary working machine (R), and the PTO shaft (27) on the machine side and the rotary working machine are provided in the enclosure space of the working machine connecting part (6). When the interlocking coupling portion of the (R) side input shaft (31) is positioned and the hitch pin (54) is engaged with the pin receiving member (55) so that the casing receiving portion and the connected portion (36) are aligned with each other, In a hand tractor configured so that an interlocking coupling portion of an input shaft (31) on a rotary working machine (R) side and a PTO shaft (27) is automatically coupled, the engine (2) and a traveling mission case ( A continuously variable transmission (12) is provided between the vehicle and 1), and travels with the power transmitted through the continuously variable transmission (12). The engine (2) is configured so as to drive wheels (5).
The PTO shaft (27) interlocked with the crossing of the continuously variable transmission (12) and the traveling mission case (1) across the working machine joint (6) located on the opposite side of the traveling mission case (1). The steering handle rod (8) extending from the traveling mission case (1) is extended to the position corresponding to the input shaft (31) of the rotary working machine (R) side, and is extended to the engine ( 2) and the continuously variable transmission (12) can be extended to the side where they are located.
(E) Action and Effect of the Invention In the hand tractor in which the present invention is implemented, after the hitch pin (54) on the upper side of the working machine mounting portion (6) is engaged with the corresponding receiving member (55), the engine (2) and the control handle rod (8) extending to the side where the continuously variable transmission (12) is located are pushed down, the push-down operation alone connects with the casing receiving portion of the work implement mounting portion (6). The parts (36) are joined in a predetermined manner, and the rotary working machine (R)
The interlocking joint between the input shaft (31) and the PTO shaft (27) on the side is automatically joined, but when pushing down the steering wheel rod (8), not only the engine (2) but also the continuously variable transmission (1
The weight of 2) also works to reduce the pushing down force,
The rotary work machine can be mounted as expected with significantly less force compared to the same type of conventional work that had to lift the control handle rod and mount the work machine while resisting the weight of the mounted work machine. It can be done quickly and can be installed quickly with less labor.

In doing so, when performing work by mounting various work machines by replacement, it is possible to perform work by setting the gear shift speed with the continuously variable transmission to the machine traveling speed suitable for each work machine. The range of application to the machine has been expanded and the versatility has increased.

(F) Embodiments Embodiments of the present invention will be described with reference to the drawings.

In FIG. 2, the hand tractor (A) is a traveling mission case (1) located in the middle part of the entire machine in the front-rear direction.
The engine (2) is disposed on one side in the front-rear direction of the vehicle, and the power is transmitted from the engine (2) to the axles (4) and (4) through the traveling transmission mechanism in the traveling mission case (1), and the axle (4) ) (4) is adapted to drive by traveling traveling wheels (5) and (5), and a handle base (7) mounted on the upper portion of the traveling mission case (1) Equipped with a steering handle rod (8) whose extension direction can be changed appropriately around the rotation axis (O), and the steering handle rod (8) can be extended to the engine (2) side for use. Is configured.

A working machine mounting portion (6) is provided on the opposite side of the engine (2), and various working machines can be attached to the working machine mounting portion (6) by replacement. The working machine mounting portion (6) is composed of a casing-like receiving portion fixed to the traveling mission case (1) side and a casing-like connected portion (36) provided on the rotary working machine side. Further, the rotary working machine shown in FIG. 1 is a tilling rotary device (R).

Next, a work machine mounting structure for the work machine mounting part (6),
The transmission structure to the traveling wheels and the working machine will be described with reference to FIG.

The traveling mission case (1) is integrally provided with a continuously variable transmission accommodating portion (10) on one side in the front-rear direction of a vertically long main body (9) and a casing receiving portion of a working machine mounting portion (6) on the opposite side. The casing pair of the engine (2) is directly connected to the continuously variable transmission accommodating portion (10).

Then, the output shaft (11) of the engine (2) is extended into the continuously variable transmission accommodating portion (10), and the output of the continuously variable transmission (12) accommodated in the continuously variable transmission accommodating portion (10) is increased. It is interlockingly connected to the axis (13).

The illustrated continuously variable transmission (12) is a friction continuously variable transmission, and has an input disk (1) fitted and fixed to the pivot shaft (13).
4) and the output disc (15) when loosely fitted to the pivot (13) at a position separated from the input disc (14) by a predetermined distance.
And a conical trochanter with a planetary arrangement between both discs (16)
And a shift ring (17) that frictionally engages the conical surface of the conical trochanter (16) and a shifter (18) that moves the shift ring (17). The movement of the shift ring (17) causes an output disc (15). The rotation of the power taken out to the side can be continuously changed from 0 to the maximum speed.

Reference numeral (19) is an actuator for moving the shifter, which is provided at the proximal portion of the steering handle rod (8) for remote control, but the steering handle rod (8) is turned. Even so, it has a connection structure that is devised so that problems such as twisting do not occur.

The output disk (15) of the friction continuously variable transmission (12) is provided with a gear (20), the gear (20) is constantly meshed with the pinion shaft (21), and further at the tip of the pinion shaft (21). Is provided with a pinion bevel gear, and the bevel gear is interlocked with a passive bevel gear of a traveling power transmission mechanism (3) housed in the case body (9).

The traveling power transmission mechanism (3) is a shaft (23) (24) and an axle (4) that are orthogonal to the pivot shaft (13) of the friction continuously variable transmission (12).
It is configured by arranging a gear group in (4), the shaft (23)
The forward and reverse rotation switching portion (25) is provided with a pair of bevel gears that are constantly meshed with the bevel gears, and a clutch body that is slidably fitted between the bevel gears and that meshes with them selectively. The forward / reverse power of the shaft (23) is transmitted from the next-order shaft (24) to the axles (4) (4).

A steering clutch is incorporated in the axles (4) and (4) so that each steering clutch can be intermittently operated by an operating tool (26).

Further, a PTO shaft (27) is interlockingly connected to the end of the pivot shaft (13) of the friction continuously variable transmission (12), and the PTO shaft (27) crosses the mission case body (9) to complete the working machine. It is extended to the casing-shaped receiving portion of the mounting portion (6).

A multi-disc clutch (29) that can be intermittently operated by a clutch operating lever (28) is installed in a portion of the PTO shaft (27) extending into the casing receiving portion, and a driven side of the multi-disc clutch (29). An occlusal connecting portion (30) is axially slidably fitted to the output end of the member, and the occlusal connecting portion (30) is provided on an input shaft (31) of a tillage rotary device (R) described later. The spring (33) is elastically urged in a direction to engage with the occlusal connecting portion (32), and the occlusal connecting portion (30) and the occluded connecting portion (32) are provided.
And form an interlocking joint.

On the other hand, on the rotary working machine, that is, on the cultivating rotary device (R) side, a passive case (35) is arranged on the upper front end of the frame (34), and a casing-like connected object is connected to the front surface of the passive case (35). The part (36) is formed.

An outer end surface portion of the connected portion (36) has a shape that fits into the casing-shaped receiving body, and the input shaft (3
The occlusal connecting part (32) installed at the shaft end of 1) is located. Then, when the connected portion (36) is matched with the casing receiving portion, the occlusal connecting portion (32) of the input shaft (31) is automatically interlocked with the occlusal connecting portion (30). .

The input shaft (31) is bearing-supported in the front chamber (37) of the passive case (35), and large and small gears (38) (39) are fixed to the interior part of the passive case (35) so that the input shaft (31) is supported in parallel above the input shaft (31). The transmission gear (41) slidably fitted to the selected transmission shaft (40) meshes with the large and small gears selectively.

A drive gear (42) is fitted on the speed change shaft (40), and the drive gear (42) is always meshed with the gear (44) of the main shaft (43) of the forward / reverse rotation switching section.

The main shaft (43) of the forward / reverse switching portion is bearing-supported by a rear casing (45) fitted to the rear side of the front chamber (37) casing, and a pair of bevel gears (46) (47) are provided in the rear casing. Are loosely fitted facing each other and their bevel gears (46) (47)
A clutch body (48) that selectively engages and disengages with the occlusal claws on the side surfaces of both bevel gears is spline-fitted in the portion between
The clutch body (48) can be switched by an operation tool (S) extending from the rear casing (45) to the rear of the rotary tiller (R). The rear housing (45)
Is partially positioned so as to project rearward from a rotary shaft described later.

An output bevel gear (49) is constantly meshed with the bevel gears (46) (47), and the output bevel gear (49) is
Is fitted to the output shaft (50) extending downward from the rear casing (45), and the clutch body (48) is fitted to both bevel gears (46).
(47) The output shaft (50) is normally rotated when engaged with one side, and the output shaft (50) is engaged when engaged with the other bevel gear.
It is designed to rotate in reverse.

The output shaft (50) extends through the cylindrical case (51) vertically extending from the rear casing (45) into the gear case (52) at the lower end of the case and the rotary shaft (supported by the gear case (52) ( Five
3) Bevel gear mechanism can be used for transmission (see Fig. 2).

A hitch pin (54) laterally supported by a support arm is provided on the upper side of the connected part (36),
The hitch pin (54) is adapted to be fitted and locked in a recessed groove of a pin receiver (55) fixedly provided on the upper side of the casing-shaped receiving portion, and further below the connected portion (36). A lock receiving shaft (57) is laterally provided in the portion by left and right pedestals (56), and the lock receiving shaft (57) is rotatably attached to the lower side of the hitch housing (6). The hook (58) is provided with a hook fixing means configured to hook, and when the tillage rotary device (R) is mounted, the hitch pin (54) is engaged with the concave groove of the pin receiver (55). After mating, the connected part (36) is fitted to the casing-shaped receiving part, and then the hook (58) is hooked on the lock receiving shaft (57) so that the cultivating rotary device (R) can be attached and fixed. ing.

FIG. 3 shows a modified example of the power transmission structure to the tilling rotary device (R) by using the same reference numerals as those in FIG.

In this example, the large and small gears (38) arranged on the input shaft (31)
(39) and the drive gear (41) of the speed change shaft (40) are arranged in the reverse of the previous example, and the pair of bevel gears (46) (47) and the clutch of the forward / reverse switching portion are arranged. A body (48) is provided on the output shaft (50) side and their bevel gears (46) (4
7) is different from the example of FIG. 2 in that a bevel gear (49) that constantly meshes is provided on the main shaft (43) side to serve as an input bevel gear, but other points are the same as those of FIG. It is configured almost the same as the one.

[Brief description of drawings]

FIG. 1 is a transmission sectional view showing a rotary working machine drive structure of a hand tractor according to the present invention, FIG. 2 is an overall side view of a hand tractor to which the present invention is applied, FIG. 3 is a skeleton diagram showing a modified example, and FIG. FIG. 4 is an overall side view of the conventional example. R …… Rotary work machine (cultivating rotary device) 1 …… Running transmission case, 2 …… Engine 5 …… Running wheel, 6 …… Working machine mounting part 8 …… Steering wheel rod, 12 …… Stepless transmission

Claims (1)

[Scope of utility model registration request] 1. An engine (2) and a work implement mounting portion (6) are installed in a front and rear portion of a traveling mission case (1) in a distributed manner, and a work implement connection located on the opposite side of the engine (1). A casing-shaped receiving portion for mounting the portion (6) on the traveling mission case (1) side, and a casing-shaped connected portion (36) corresponding to the casing-shaped receiving portion mounted on the rotary working machine (R) side; The hitch pin (54) and the pin receiver (55), which are located above the machine mounting portion (6) and are horizontally provided on the traveling mission case (1) and the rotary working machine (R), and the working machine mounting portion (6). It is composed of a traveling mission case (1) on the lower side and a latch fixing means provided on the rotary working machine (R), and the PTO shaft (on this machine side) in the enclosure space of the working machine connecting part (6) ( 27) and the rotary work machine (R) side input shaft (31) interlocking coupling portion is positioned, and the hitch pin (54) is attached to the pin receiving member (5). When the housing receiving part and the connected part (36) are brought into contact with each other by engaging with 5), the interlocking connecting part of the input shaft (31) and the PTO shaft (27) on the rotary working machine (R) side is automatically In the hand tractor configured to be coupled, a continuously variable transmission (12) is provided between the engine (2) and the traveling mission case (1), and is transmitted through the continuously variable transmission (12). And the engine (2)
The PTO shaft (27) interlocked with the crossing of the continuously variable transmission (12) and the traveling mission case (1) across the working machine joint (6) located on the opposite side of the traveling mission case (1). The input shaft (3
1), so that the steering handle rod (8) extending from the traveling mission case (1) can be extended to the side where the engine (2) and the continuously variable transmission (12) are located. The rotary work machine drive structure for the hand tractor.