JPH0321370B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a gear shifting shifter that is externally fitted onto a first rotating support shaft such that it can rotate freely and slide freely, and that the gear shifting shifter is fitted with respect to the sliding shaft center. A shifter operation pin slidably engaged in a long hole provided in an inclined state is provided on the first rotary support shaft so as to be freely rotatable therein, and the first rotary support shaft is connected to a first link mechanism. A differential locking/closing shifter whose sliding stroke is different from that of the shifting shifter is linked to the gear shift operating lever through the gear shifter, and is rotated and slid relative to a second rotating pivot shaft coaxial with the first rotating pivot shaft. A shifter operating pin that is freely fitted onto the outside and slidably engaged in a long hole provided in the shifter for opening and closing the differential lock in a state that is inclined with respect to the sliding axis is rotated integrally with the second rotation support shaft. For traveling of a working vehicle, the second rotational support shaft is linked to a differential lock operating lever that is swingable about the same or almost the same axis as the speed change operating lever via a second link mechanism. Concerning operation structure.

[Conventional technology]

The driving operation structure described above switches the transmission by rotating the first rotational support shaft using the gearshift operation lever, and turns on/off the differential gear by rotating the second rotational support shaft using the differential operation lever. It is structured as follows.

In this type of operation structure for driving, conventionally, the angle of inclination of the elongated hole in the shifter for shifting with respect to the shifter sliding axis is the same as the angle of inclination of the elongated hole in the shifter for disengaging the differential lock with respect to the sliding axis of the shifter. , the following disadvantages arose.

[Problem that the invention seeks to solve]

In other words, if the oblong hole inclination angles are the same as described above, the angle of the first rotating shaft that must be rotated to operate the transmission and the angle of the second rotating shaft that must be rotated to operate the deflock device will be different. When the length of the gear shift operating lever is the same as the length of the differential operating lever because the angles are different, and the lever operating stroke required to operate the transmission and the lever operating stroke required to operate the differential gear are the same. , it was necessary to make the specifications of the first link mechanism and the specifications of the second link mechanism different.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to make the specifications of the speed change operating lever and the differential lock operating lever the same while making the specifications of the first link mechanism and the second link mechanism the same.

[Means for solving problems]

The characteristic configuration of the present invention is that in the operating structure for traveling of a working vehicle, the inclination angle of the elongated hole with respect to the sliding axis of the shifter having a larger sliding stroke of the two shifters is such that the sliding Both the elongated holes are formed so that the inclination angle with respect to the sliding axis of the elongated hole in the shifter with the smaller stroke is smaller, and the first link mechanism and the second link mechanism are In addition, the speed change operation lever and the deflock operation lever are formed to the same specifications, and their functions and effects are as follows.

[Effect]

If the inclination angle of the elongated hole of the transmission shifter and the inclination angle of the elongated hole of the differential shifter are made different as described above, by appropriately setting the inclination angle difference, the first rotating support shaft necessary for operating the transmission can be adjusted. The rotation angle of the second rotation support shaft necessary for operating the deflock device becomes the same.

〔Effect of the invention〕

By making the necessary operation rotation angles of the first and second rotational support shafts the same, it is possible to make the operation strokes of the shift operation lever and the differential lock operation lever the same while making the lengths the same. This can be done while keeping the specifications of the second link mechanism the same, and in order to make the specifications of both operation levers the same, the oblong hole inclination angle is the same and the specifications of the first link mechanism and the second link mechanism are different. It is better to make the specifications of the first link mechanism and the second link mechanism the same by making the elongated hole inclination angle different than to make the long hole inclination angle different, because the number of parts required for the link mechanism is large, so it is easier to manufacture parts. It has become possible to reduce the amount of effort required, and it has become possible to inexpensively configure both operating levers with the same length and required operating stroke, with excellent operability.

〔Example〕

As shown in FIG. 7, a pair of left and right wheels 1, 1,
A rotary tilling device 3 is connected to the control handle 2 and the like to the rear of the self-propelled vehicle, and power is transmitted from the self-propelled vehicle to the tilling device 3, thereby forming a walking type tiller.

To enable power transmission to the wheels 1 and the tilling device 3, a pulley 6 is connected to the engine 4 via a transmission belt 5, as shown in FIGS. 4 and 5.
The rotational force of the transmission gear 10 is introduced into the transmission case 9 via the main clutch 7 and the input shaft 8, and the rotational force of the input shaft 8 is transmitted to the transmission gear 10, and the rotational force of the transmission gear 10 is divided into two high and low speed stages. Switchable tillage device transmission 11, tillage device clutch 1
2. Power is transmitted to the input shaft 16 of the tiller 3 via a power take-off shaft 13 and a chain transmission mechanism 15 housed in the transmission case 14. and,
The rotational force of the transmission gear 10 is divided into four forward speeds and two reverse speeds.
The transmission is transmitted to the differential mechanism 19 through the main transmission for traveling 17 which can be switched to two high and low speeds, and the auxiliary transmission for traveling 18 which can be switched to two high and low speeds, and the rotation of one output gear 20a of this differential mechanism 19 is transmitted. Power is transmitted to one axle 23a via the steering clutch gear 21a and the transmission gear mechanism 22a, and the differential mechanism 19
The rotational force of the other output gear 20b is transmitted to the other axle 23b via the steering clutch gear 21b and the transmission gear mechanism 22b.

As shown in FIG. 6, the input shaft 8 is configured to be replaceable with another input shaft 24 for deceleration transmission, and when this input shaft 24 for deceleration transmission is attached, the output gear of the input shaft 24 for deceleration transmission is A passive gear 26 that engages with the transmission gear 10 is added to the intermediate transmission shaft 27, a reduction transmission gear 28 is attached to the intermediate transmission shaft 27 in place of the transmission gear 10, and a passive gear 29 that engages with the transmission gear 10 is replaced with the A passive gear 30 that meshes with the reduction transmission gear 28 is attached to the intermediate transmission shaft 31 to switch the transmission configuration for the tiller transmission 11 and the traveling main transmission 17 to low speed.

The operating structure of the traveling sub-transmission device 18 is constructed as shown in FIGS. 1 and 2.

That is, the shift gear 3 is attached to the input shaft 32 of the sub-transmission device 18 so as to be slidable and integrally rotatable.
Of the first and second rotational support shafts 35 and 36, the shifter 34 for sliding operation of the first and second rotational support shafts 35 and 36 is attached to the transmission case 9 so that it can only rotate with the shifter 34 arranged concentrically. It is mounted so that it can rotate and slide relative to the other side. A shifter operation pin 38 is slidably engaged in a long hole 37 provided in the shifter 34 and is rotatably provided on the first rotational support shaft 35, so that the first rotational support shaft 35 is rotated. This rotational force and the intermediate portion 3 of the elongated hole 37
7a relative to the shifter sliding axis _P1 , the shifter operating pin 38 is configured to slide the shifter 34. A speed change operating lever 42 is connected to the first rotating support shaft 35 via a first link mechanism 41 consisting of a swing link 39, a push/pull rod 40, etc., and is attached to the fuselage part 43.
It is attached so as to be able to swing freely, and the shift operation lever 4
By sliding the lever guide 44 along the second lever guide 44, the first rotating support shaft 35 is rotated.

When the speed change operation lever 42 is in the high speed position (H) or the low speed position (L), the shifter operation pin 38 is aligned with the shifter sliding axis at one end or the other end of the elongated hole 37.
It is configured to enter a portion 37b or 37c perpendicular to _P1 . Then, a spring 45 that biases the first rotation support shaft 35 to rotate is applied to the swing link 39, and the link 3
9, the shifter operation pin 38 moves into the elongated hole 37.
The shifter operating pin 38 is configured to be reversely switched between a state in which it is biased in the rotational direction toward one end of the elongated hole 37 and a state in which the shifter operation pin 38 is biased in the rotational direction toward the other end of the elongated hole 37 . That is, the shifter operation pin 38 is connected to the elongated hole portion 37b or 37c.
The shifter 34 is positioned and held at the high speed position or the low speed position by being biased by the spring 45 and by the contact between the shifter operating pin 38 and the shifter 34 in the long hole portion 37b or 37c. There is.

As shown in FIGS. 1 and 4, a differential lock 46 is attached to the output gear 20a so as to be able to rotate and slide integrally with the output gear 20a. The shifter 48 slides the deflock device 46 into the position where it is removed from the case 47 to switch between the engaged state and the off state, and the sliding stroke of the shifter 48 required for this switching is such that The differential lock device 49 is configured to have a smaller sliding stroke for shifting. The operating structure of this deflock device 49 is constructed as shown in FIGS. 1 and 2.

That is, the shifter 48 is attached to the second rotational support shaft 36 so as to be relatively rotatable and slidable, and the shifter operation pin 51, which is slidably engaged in the elongated hole 50 provided in the shifter 48, is rotated for a second rotation. The support shaft 36 is provided to be integrally rotatable, and when the second rotation support shaft 36 is rotated, this rotational force and the shifter sliding axis of the intermediate portion 50a of the elongated hole 50 are generated.
Due to the tilt relative to P ₁ , the shifter operating pin 51 is configured to slidingly operate the shifter 48 . The differential lock operating lever 55, which is interlocked with the second rotating support shaft 36 via a second link mechanism 54 consisting of a swing link 52, a push/pull rod 53, etc., is positioned on the same or almost the same axis as the speed change operating lever 44. The fuselage part 4 can swing freely around P ₂ .
3, and by swinging the differential lock operating lever 55 along the lever guide 44,
The second rotating support shaft 36 is rotatably operated.

The differential lock operating lever 55 is in the engaged position (ON)
Alternatively, when the cut position (OFF) is reached, the shifter operating pin 51 is configured to enter a portion 50b or 50c at one end or the other end of the elongated hole 50 orthogonal to the shifter sliding axis _P1 . Then, a spring 56 that biases the second rotational support shaft 36 to rotate is applied to the swinging link 52, and as the link 52 swings, the shifter operation pin 51 moves toward one end of the elongated hole 50. The shifter operation pin 51 is configured to be reversely switched between a state in which it is biased in the rotational direction and a state in which the shifter operation pin 51 is biased in the rotational direction toward the other end of the elongated hole 50.
That is, the shifter operation pin 51 is connected to the elongated hole portion 5.
0b or 50c and is biased by the spring 56, and the shifter operation pin 51 and the shifter 48 come into contact with each other in the elongated hole portion 50b or 50c, the shifter 48 is positioned at the differential locking position or the differential locking off position. It is designed to be retained.

As shown in FIG. 3, the gear shifter 34
The inclination angle θ ₁ of the elongated hole intermediate side portion 37a with respect to the shifter sliding axis P ₁ is smaller than the inclination angle θ _{2 of the elongated hole intermediate side portion 50a of the shifter 48 for opening and closing the differential lock with respect to the shifter sliding axis P 1 .} The intermediate side portions 37a and 50a of both elongated holes are formed as shown in FIG.
That is, while both the link mechanisms 41 and 54 are configured with parts of the same shape and the same quantity, and while the specifications of the gear shift operation lever 42 and the specifications of the differential lock operation lever 55 are the same, that is, the grip portion 42a or 55a The lever body except for the part is the same shaped part, and both operating levers 4
The operating stroke of the lever 42 required to operate the transmission while ensuring that the lengths of 2 and 55 are the same.
S ₁ and the operation stroke S ₂ of the lever 55 required to operate the deflock device are made to be the same.
In other words, regardless of the difference in the strokes required for a predetermined operation between the transmission shifter 34 and the differential shifter 48, the rotation angle of the first rotational support shaft 35 required for transmission operation and the second rotational support shaft required for differential operation is different. The difference in inclination angle between the intermediate portions 37a and 50a of both the elongated holes is set so that the rotation angles of the elongated holes 36 are the same.

[Another example]

The present invention can also be applied to a configuration in which the magnitude of the shifter stroke is opposite to that of the above embodiment.

In addition to walk-behind tillers, the present invention can also be applied to various work vehicles such as riding tractors, rice transplanters, and transport vehicles.

[Brief explanation of the drawing]

The drawings show an embodiment of the operation structure for traveling of a working vehicle according to the present invention, FIG. 1 is a cross-sectional view of the auxiliary transmission for traveling and the differential lock device, FIG. 2 is a perspective view of the link mechanism, and FIG. 3 is a diagram of the shifter. A front view of the operating section, Fig. 4 is a cross-sectional view of the transmission, Fig. 5 is a cross-sectional view of the transmission part for the tiller device, Fig. 6 is a cross-sectional view of the transmission in the low-speed transmission state, and Fig. 7 is the traveling type cultivator. It is a side view of the whole machine. 34... Speed shifter, 35... First rotating support shaft, 36... Second rotating support shaft, 37a, 50a...
Long hole, 38, 51...Shifter operation pin, 41...
...First link mechanism, 42...Speed control lever, 4
8...Shifter for switching off with differential lock, 54...
2nd link mechanism, 55...Defroc operating lever, _P1 ...Shifter sliding axis, _P2 ...Lever sliding axis.

Claims (1)

[Claims] 1. Fit the gearshift shifter 34 onto the first rotational support shaft 35 so that it can rotate and slide freely, and insert the gearshift shifter 34 into the elongated hole 37a provided in the gearshift shifter ₃₄ so as to be inclined with respect to the sliding axis P1. A shifter operation pin 38 that is slidably engaged is provided on the first rotary support shaft 35 so as to be integrally rotatable therein, and the first rotary support shaft 35 is connected to the speed change operation lever 42 via a first link mechanism 41. A differential locking/closing shifter 48 whose sliding stroke is different from that of the transmission shifter 34 is connected to the first rotating support shaft 3.
A long hole 50a is fitted onto the second rotating shaft 36 coaxial with the second rotating shaft 36 so as to be relatively rotatable and slidable, and is provided in the differential shifter 48 so as to be inclined with respect to the sliding axis _P1 . The second rotary support shaft 36 is provided with a shifter operation pin 51 that is slidably engaged with the shifter operation pin 51 and is rotatably integrated with the second rotation support shaft 36, and the second rotation support shaft 36 is connected to the shift operation lever via a second link mechanism Axial center P ₂ that is the same or almost the same as 42
The long hole 3 in the shifter 34 of the shifter 34, which has the larger sliding stroke, of the two shifters 34, 48, is an operation structure for driving a working vehicle that is linked to a defrock operating lever 55 that is slidable around the shifter 34.
7a with respect to the sliding axis P ₁ is smaller than the inclination angle θ ₂ of the elongated hole 50a with respect to the sliding axis P ₁ in the shifter 48 having _the smaller sliding stroke. Both elongated holes 37a and 50a are formed, and the first link mechanism 41 and the second link mechanism
This operating structure for driving a working vehicle has a link mechanism 54, and the gear shift operating lever 42 and the deflock operating lever 55 are formed to the same specifications.