JPH0432004Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention is based on the transmission case of the rotary working device, which is connected to the transmission case of the machine side around the transmission axis.
The present invention relates to a rotary working machine configured to be able to switch the drive rotation direction of the rotary working machine between forward and reverse directions by reversing it 180 degrees.

[Conventional technology]

In the conventional rotary tiller, 52-57041
As disclosed in the above publication or as shown in FIG. 4, the transmission case 06 of the rotary working device A is fitted and held in the transmission case 02 so as to be rotatable and freely inserted into and removed from the transmission case 02. , between the transmission case 02 and the transmission case 06 is a 2
A fixing mechanism 015 using bolts and nuts 015a and 015b which can be fixed and released from the mission case 02 in this state is provided.

[The problem that the idea aims to solve]

In this case, when the fixing mechanism 015 is unfixed, the transmission case 06 of the rotary working device A will fall out from the transmission case 02, so the drive rotation of the rotary working device 0A will depend on the content of the work such as crushing soil or plowing. When changing the direction, the weight of rotary working device A must be supported by rotating it 180 degrees to fix the position of both, which is a drawback that it takes a lot of effort and time to switch between forward and reverse directions of rotary working device A. It was hot.

The present invention improves the above-mentioned drawbacks by rationally modifying the transmission case of the transmission case and the transmission case of the rotary working device. The purpose is to provide something that allows the attitude of the aircraft to be set in the direction of movement of the aircraft.

[Means to solve the problem]

A characteristic configuration of the rotary working machine according to the present invention, which has been made to achieve the above object, is that the transmission case of the rotary working device is fitted into the transmission case in a state where it is not removed and is rotatable 360 degrees around the transmission axis. A mechanism is provided between the transmission case and the transmission case to allow the transmission case to be fixed to and released from the transmission case in two states in which the transmission case is inverted by 180 degrees.
The fixing mechanism includes a pair of engaged portions having a phase difference of 180 degrees around the rotation axis of the transmission case;
an engaging part configured to be selectively engageable and detachable from the engaged part, and the engaged part and the engaging part are in the disengaged state when When the engaging part and the engaged part move relative to each other as the transmission case rotates, the engaging part is configured to move to a position where mutual interference with the engaged part is avoided. .

The functions and effects of the present invention with the above characteristic configuration are as follows.

<Function> In other words, even if the fixing mechanism is unlocked, the load of the rotary working device can be supported by the transmission case, so the drive rotation direction of the rotary working device can be adjusted depending on the content of the work such as crushing soil or plowing. Even when switching, there is no need to manually support the rotary working device as in the conventional case, and the rotary working device can be easily reversed and fixedly aligned with the mission case.

<Effects> Therefore, by simply and economically modifying the transmission case of the rotary working device by fitting and holding it in the transmission case in a state that prevents it from coming out, it is possible to easily and quickly perform the work of reversing and fixing the rotary working device. .

However, it is also disclosed in Japanese Utility Model Application Publication No. 53-152905 as having a configuration in which the transmission case is attached to the transmission case in a manner that it does not come off, and the transmission case can be rotated nearly 180 degrees around the transmission axis. In this respect, the same effects as those of the present invention can be expected, but there are differences from the present invention in the following points. In other words, as a fixing mechanism between the transmission case and the transmission case, an L-shaped bracket in side view is extended from the transmission case side, and the transmission case side contacts this L-shaped bracket from the side and is connected and fixed with bolts. It is constructed by installing two plate-shaped brackets 180 degrees apart, but if the L-shaped bracket is installed at the normal position along the direction of movement of the aircraft,
On the other hand, a transmission case equipped with a plate-shaped bracket that abuts from the side will deviate from the direction of movement of the machine by approximately the thickness of the L-shaped bracket, so the direction of rotation of the rotary working device will also be slightly different. Yes, but it will be off. So, when trying to solve this problem,
The plate-shaped bracket on the transmission case side must be set in a predetermined position to absorb the displacement, which increases the burden on manufacturing and design.

Furthermore, due to the presence of the L-shaped bracket, the transmission case can only be rotated to the position where the plate-shaped bracket comes into contact with the L-shaped bracket. Since the switch can only be reversed in one direction, it has the disadvantage that the rotation required for switching is restricted to a fixed direction.

In contrast to such conventional configurations, the present invention has the following features: ○B As the fixing mechanism, an engagement method such as an engagement groove and a lock pin can be adopted, so that the aircraft can be reliably positioned at 180 degrees opposite positions along the direction of movement of the aircraft. An engaging groove as an engaged portion can be formed in the rotary working device, and thereby the rotational direction of the rotary working device can be inevitably aligned with the direction of movement of the machine body.

○B Moreover, since the engaging part leaves the rotational movement space of the engaged part in the disengaged state, the transmission case is rotatable 360 degrees around the transmission axis with respect to the transmission case, and is fixed. As mentioned above, the mechanism can also be disengaged, so when changing the rotational direction of the rotary working device, the engagement state can be disengaged and the transmission case can be rotated in either the forward or reverse direction. This allows for better operability.

〔Example〕

Hereinafter, embodiments of the configuration of the present invention will be described based on the drawings.

As shown in FIG. 1, a transmission case 2 consisting of a front case part 2A and a rear case part 2B, which is approximately curved in side view, is directly connected to the rear of the engine 1. Case part 2A
A chain case 4 that pivotally supports one running wheel 3 and a steering handle 5 are attached to the rear case portion 2B of the transmission case 2.
A transmission case 6 of a rotary tilling device A, which is an example of a rotary working device, and a frame 8 that supports a tilling cover 7 of the rotary tilling device A are attached to form a walk-behind tiller, which is an example of a rotary working device. .

As shown in FIGS. 2 and 3, the transmission case 6 of the rotary tillage device A has a drive rotation shaft 9 in a vertical orientation and a tilling claw shaft 10 in a lateral orientation, which are interlocked with the transmission case 2 side. bevel gears 11 and 1 that support the shafts 9 and 10 and interlock these shafts 9 and 10;
There are two pairs inside.

Thus, the transmission case 6 rotatably inserted into the rear case portion 2B of the transmission case 2,
The contact with the inner and outer surfaces of the rear case portion 2B prevents the transmission case 6 from moving in the direction of the drive rotation shaft 9, and prevents the transmission case from rotating 360 degrees around the drive rotation shaft. Permissible hit member 13,1
4 is provided, and this transmission case 6 is installed between the rear case portion 2B and the transmission case 6 by 180 degrees.
A mechanism 15 is provided that can be fixed and unfixed to the transmission case 2 in two states in which the transmission case 2 is inverted by 180 degrees. The drive rotation direction can be switched between forward and reverse directions.

To configure the fixing mechanism 15, engagement grooves 15a, 15a as engaged parts are formed in two places displaced by 180 degrees in the circumferential direction of the rear case part 2B, and the lower part of the transmission case 6 The abutment member 14 includes a lock pin 15b as an engagement portion that can be selectively engaged with the engagement grooves 15a and is biased to swing in the engagement direction, and a space in the upper side of the frame 8. A handle 15c is provided for rotating the transmission case 6 through the handle.

In the above-described embodiment, the fixing mechanism 15 was constructed using the swing type lock pin 15b, but it may be constructed using a bolt/nut or a removable lock pin instead.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary working machine according to the present invention, and FIG. 1 is an overall side view of the walk-behind cultivator, FIG. 2 is a partially cutaway rear view of the main parts, and FIG.
FIG. FIG. 4 is a partially cutaway rear view showing the main parts of a conventional walk-behind cultivator. A... Rotary working device, 2... Mission case, 6... Transmission case, 15... Fixing mechanism, 1
5a...Engaged part (engaging groove), 15b...Engaging part (lock pin).

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The transmission case 6 of the rotary working device A is attached around the transmission shaft center to the transmission case 2 of the machine side.
The rotary working machine is configured such that the drive rotation direction of the rotary working device A can be switched between forward and reverse by reversing the rotary working device A by 180 degrees, and the transmission case 6 of the rotary working device A is pulled out from the transmission case 2. Around the center of the transmission shaft in the stopped state
It is fitted and held so that it can rotate 360 degrees, and
Between the transmission case 2 and the transmission case 6, there is a 2
A mechanism 15 is provided which can be fixed and unfixed to the transmission case 2 in the state, and the fixing mechanism 15 has a pair of engaged parts 15a whose phases around the rotational axis of the transmission case 6 are different by 180 degrees. ，
15a, and an engaging portion 15b configured to be selectively engageable and detachable from the engaged portions 15a, 15a.
and the engaged portion 15a,
15a and the engaging portion 15b are in the disengaged state, and when the engaging portion 15b and the engaged portions 15a, 15a move relative to each other as the transmission case 6 rotates, the engaging portion 15b is in the disengaged state. Engaged part 1
A rotary work machine configured to exit to a position that avoids mutual interference with 5a and 15a. 2. The rotary working machine according to claim 1, wherein the engaged portions 15a, 15a are engagement grooves formed at two locations in the connecting portion of the transmission case 2. 3 The engaging portion 15b is connected to the engaging groove 15a, 1
According to claim 2 of the utility model registration claim, the lock pin 15b is selectively engaged with the transmission case 6 and is attached to the transmission case 6 in a state in which the lock pin 15b is selectively engaged with the lock pin 5a and is elastically biased in the engagement direction. The rotary work machine described.