JPS6141662Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a walking-type mobile agricultural machine equipped with a steering handle that can be changed forward and backward relative to the machine body, and a steering clutch connection state switching device.

In this type of walking-type mobile agricultural machinery, it is necessary to be able to perform steering operations with the same feeling regardless of the direction of the handle, and conventionally, the operating side rotating body connected to the handle side is generally attached to a single spindle. At the same time, on the other hand, a driven rotating body connected to the clutch side is provided on a separate support shaft, and a fork member is pivotally supported in order to move the operating side rotating body or the driven side rotating body to switch the linked state, etc. , a plurality of support shafts are provided, which complicates the structure and requires relative positioning of both rotating bodies and the support shaft during assembly, making assembly difficult.

The purpose of this invention is to devise the structure and arrangement position so that the operating side rotary body, the driven side rotary body, and the mechanism for switching their interlocking state can be mounted on a single support shaft. , the overall size has been made more compact, and the structure and assembly process have been simplified, and furthermore, when disposed on a single spindle in this way, the required linkage state can be switched accurately. It's about being creative.

The characteristic configuration of the present invention to achieve the above object is that the steering handle can be turned in the direction of the aircraft body by rotating around the vertical axis, and a pair of left and right wheels are provided on the handle side. A pair of operation-side rotating bodies that are linked to the operating tools, and a pair of driven-side rotating bodies that are linked to a pair of left and right steering clutches provided inside the transmission case are each attached to the operating shaft that is pivotally connected to the handle. The operating shaft is configured to be able to swing relative to each of the rotating bodies in the axial direction, and the operating rotating body and the driven rotating body are alternately positioned in the axial direction of the operating shaft. and further located on the outer periphery of the operating shaft and sliding integrally with the operating shaft, and
Providing an engaging member configured to selectively engage adjacent ones of the operating side rotary body and the driven side rotary body to change the combination in which they should rotate together; The axial length of this engaging member is set to be shorter than the sum of the axial lengths of two adjacent rotating bodies and longer than the axial length of one of the rotating bodies. This configuration provides the following effects.

In other words, instead of using a dedicated support shaft for each rotating body, both the operating side rotating body and the driven rotating body are attached to a single shaft, and that shaft can also be used as an operating tool by sliding. Since it is also an operating shaft configured to switch the state of connection with the steering clutch, the number of shafts used as support shafts is kept to the minimum necessary, reducing the number of parts and simplifying the overall structure.
The system can also be made more compact as a whole, and there is no need for troublesome assembly processes such as aligning multiple support shafts, and each rotating body can be simply assembled concentrically onto a single operating shaft. Because it is a good thing to add,
As mentioned above, the structure itself is simple, and together with this, there is an advantage that manufacturing and processing can be facilitated.

In this way, the types are different from each other, and
By disposing a plurality of rotating bodies alternately on one operating shaft and sliding this operating shaft, the combination of the rotating bodies that rotate integrally with each other can be changed,
In the device that switches the state of connection between the operating tool and the steering clutch, depending on the amount of sliding operation of the operating shaft, most of the engaging member is engaged with one side of the adjacent rotating body, In some cases, an operation to change the combination of rotating bodies may be completed with only a small portion of the engaging member engaged with the other rotating body.
In this case, the external force associated with the steering clutch operation acts intensively on the engagement point between the engagement member and the rotating body, which has an extremely small amount of engagement, and there is a risk of accelerated wear and tear at that engagement point. However, in the present invention, when switching the linked state with such a structure, the axis of the engaging member is As mentioned above, the directional length is set to be shorter than the sum of the axial lengths of two adjacent rotating bodies and longer than the axial length of one of the rotating bodies, When only a small portion of one end of an engaging member that engages with one rotating body engages with the adjacent rotating body, the other end of the engaging member also engages with the opposite rotating body. It becomes a state of
Therefore, when operating the operating tool in this state, the operating resistance can significantly increase (double) compared to operating it in a proper switching state, and it is immediately recognized that the switching is incorrect, so such By simply sliding the operating shaft so as to eliminate the state in which large operating resistance is applied, the engagement between the engaging member and the rotating body can be adjusted appropriately, and excessive external force is not concentrated at the engagement point. This is advantageous in that there is less risk of causing inconvenient situations such as accelerated wear and tear of the engaged portion or unexpected disengagement from the engaged state.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an axle 1 protruding from the bottom of a transmission case 1 that houses a pair of left and right steering clutches 6, 6'.
2, 12' and walking wheels 13, 13'. In addition to the tilling rotary selection device, a frame 15 on which a driving unit 14 is mounted is fixedly connected to the front of the mission case 1, and a pair of left and right operating levers 4, 4' (operating tools) are attached. The control handle 3 is attached to the cylinder shaft 2 projecting upward from the mission case 1 so that it can be rotated around the axis of the cylinder shaft (up and down axis) to change the direction forward and backward with respect to the aircraft body. The second section shows a walking-type mobile agricultural machine for tillage.
Figures 7 to 7 show the main structure thereof.

Reference numeral 5 denotes an operation-side rotating body connected to one of the pair of operation levers 4 and 4' via a wire 16, and 5' indicates an operation-side rotating body connected to the other operation lever 4' via a wire 16'. These rotating bodies 5 and 5' are connected to each other on the operation side, and these rotating bodies 5 and 5' are arranged in the same cylindrical shape and spaced apart from each other in the axial direction. Reference numeral 7 denotes a driven side rotating body linked to one steering clutch 6 of the pair of steering clutches 6, 6' via a wire 17, and 7' indicates a wire 17' to the other steering clutch 6'. These are driven-side rotating bodies that are linked via the driven-side rotating body 7.
is configured in a bifurcated form concentrically located on both sides of the parallel operating side rotating bodies 5, 5', and the other driven side rotating body 7' is arranged concentrically between the operating side rotating bodies 5, 5'. It is located like a core.

10 is capable of automatically changing the combination of the pair of operation-side rotors 5, 5' and the pair of driven-side rotors 7, 7' to be rotated together as the handle 3 changes forward and backward direction; This is a cam mechanism for automatic clutch engagement state switching, which consists of a switching device and an interlocking cam device that interlocks the switching device with three rotations of the handle.

The switching device includes a rotating body 5 on the handle 3;
The rotating body 5,
An operating shaft 8, which also serves as a pivot shaft for the rotating bodies 5', 7, and 7', is mounted so that it can freely slide back and forth only in its axial direction, and the operating shaft 8 and the rotating bodies 5, 5', 7,
7', one operating side rotating body 5 is connected to the driven side rotating body 7, by sliding against the rotating body in the axial direction.
The collar 9 is provided with an engaging protrusion 9a as an engaging member that can be selectively engaged with and interlocked with respect to the rotating body 7', and the collar 9 slides against the rotating body in the axial direction to drive the other operating side rotating body 5'. The collar 9', which is provided with an engaging protrusion 9a' as an engaging member that can selectively engage and interlock with the side rotating bodies 7 and 7', is in a state where it can only rotate independently with respect to the operating shaft 8. A driven rotating body 7, which is interlocked with the operating rotating bodies 5, 5' via collars 9, 9' by the reciprocating sliding of the operating shaft 8.
7' is configured to be replaced. The engaging protrusions 9a, 9a' protruding from the collars 9, 9' extend their axial lengths to the two adjacent rotating bodies (5, 9').
7' or 5', 7), and longer than the axial length of one of the rotating bodies (5 or 7' or 5' or 7). , the engagement interlocking grooves 5a, 5a', 7a, 7a' on the side of the rotating bodies 5, 5', 7, 7' that engage with the engaging protrusions 9a, 9a' are connected to the engaging projections 9a, 9a'.
Only when 7 and 7' are in the clutched rotational position, the engaging protrusions 9a and 9a' are positioned in a straight line to enable sliding between the rotating bodies 5, 5', 7, and 7'. It is structured as follows.

The interlocking cam device includes a swinging member 19 that slides the operating shaft 8 by swinging, a cam 11 on the fixed part, and a swinging member 19 that swings as the handle rotates. , the swinging member 19
A spring 20 is provided at the tip of the cam follower 19a to bring it into elastic contact with the cam 11.

In addition, a fixing nut 24 with chrysanthemum seats 23, 23' is provided between the fixing part around the cylinder shaft 2 and the mounting base end of the handle 3, so that the front-back posture of the handle 3 can be adjusted within a certain range θ, It is configured so that it can be changed in small increments within θ'.

Therefore, the engaging protrusions 9a, 9a' of the collars 9, 9' whose axial lengths are set as described above are engaged with both driven rotating bodies 7, 7' at both ends during the selective sliding. The cam mechanism 1
0, and during rotation a beyond a certain range θ, θ' for changing the forward and backward direction of the handle 3, both operating side rotating bodies 5, 5' are both a pair of driven side rotating bodies. 7 and 7' so as to rotate together.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking-type mobile agricultural machine according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged side view with a partial cutout of the main part, and Fig. 3 is the - line in Fig. 1. An enlarged sectional view, FIGS. 4 to 6 are cross-sectional plan views showing the operating state of the cam mechanism as the handle direction is changed, and FIG. 7 is a plan view of the main parts showing the range of rotation of the handle. 1... Mission case, 3... Steering handle, 4, 4'... Operating tool, 5, 5'... Operating side rotating body, 6, 6'... Steering clutch, 7, 7'... Driven Side rotating body, 8... operating shaft, 9a, 9a'... engaging member.

Claims (1)

[Scope of utility model registration request] The control handle 3 is configured to be able to change its direction forward and backward with respect to the aircraft body by rotating around the vertical axis, and a pair of operating sides are connected to a pair of left and right operating tools 4, 4' provided on the side of the handle 3. rotating body 5,
5' and a pair of driven-side rotating bodies 7, 7 that are connected to a pair of left and right steering clutches 6, 6' inside the transmission case 1 are respectively attached to an operating shaft 8 that is pivotally connected to the handle 3. , and this operating shaft 8 is configured to be slidable relative to each of the rotating bodies 5, 5', 7, 7' in the axial direction, and the operating shaft 8 is configured to be slidable relative to the rotating bodies 5, 5', 7, 7' on the operating side and the driven rotating body. 7 and 7' are arranged alternately in the axial direction of the operating shaft 8, and furthermore, they are located on the outer circumference of the operating shaft 8 and slide integrally with the operating shaft 8, and , configured to selectively engage with adjacent ones of the operating-side rotary bodies 5, 5' and driven-side rotary bodies 7, 7' to change the combination in which they should rotate together. In addition, the axial length of the engaging members 9a, 9a' is set to the axial length of the two adjacent rotating bodies (5, 7' or 5', 7). and one of the rotating bodies (5 or 7 or 5' or 7)
A walk-behind mobile agricultural machine whose axial length is longer than the axial length of the machine.