JPH0314733A - Transmission structure for mobile agricultural machine - Google Patents

Abstract

PURPOSE:To prevent generation of mechanical error such as play and rattle due to long time service by detaining a plurality of detents formed on a shift lever directly with No. 1 and No. 2 shift shaft, making slide operation, and thereby performing shift control. CONSTITUTION:No. 1 and No. 2 shift shafts 39, 40 for shifting the gear mesh on a running agricultural machine, which are to operate two types of geared transmission mechanisms arranged in series, are protruded at the sides of a transmission case 1 with possibility of fitting in and removing off, and a shift lever 42 rotatable round No. 1 axis P1 and swingable round No. 2 axis P2 is arranged in the middle of these protrusions. When this shift lever 42 is turned into No. 1 swing operating position A, No. 1 and oppositely directed No. 2 detents 44, 45 formed protruding at the shift lever 42 are detained with No. 1, No. 2 detents 47, 48 provided on the shift shafts 39, 40, respectively. When it is turned into No. 2 swing operating position B, on the other hand, No. 3 detaining part 46 formed at the shift lever 42 shall be detained with No. 3, No. 4 detent 49, 50 provided on the shift shafts 39, 40 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traveling transmission structure for an agricultural working machine in which two types of gear transmission mechanisms are arranged in series for traveling.

[Conventional technology]

As mentioned above, one structure in which the first and second shift shafts, which respectively shift the speeds of two types of gear transmission mechanisms, are simultaneously slid by a single shift lever is disclosed in Japanese Utility Model Application Publication No. 60-629. ing. In other words, when the gear shift lever is swung in the horizontal direction on the page, the first shift shaft (corresponding to the main shift shifter in the disclosed publication) is slid in the left and right direction on the page, and the shift lever is swung in the vertical direction on the page. Then,
A cam-type operating plate engaged with the speed change lever slides in the vertical direction in the drawing, and the second shift shaft (corresponding to the sub-speed shifter in the disclosed publication) is slid in the horizontal direction in the drawing.

[Problem to be solved by the invention]

In the above structure, the gear shift lever is directly engaged with the first shift shaft, so mechanical errors such as gaps and rattles that occur between the two during gear shifting operations are small. and the gear shift lever, the gear shift lever and the cam type operation plate are interlocked and connected via a pin and a long hole, and the pin of the second shift shaft is engaged in the oblique long hole of the cam type operation plate. The movement of the cam type operation plate in the vertical direction in the drawing is converted into the movement of the second shift shaft in the horizontal direction in the drawing by the elongated hole.

As mentioned above, since the gear shift lever and the second shift shaft are not directly linked, mechanical errors between the two tend to become large, and depending on long-term use, there is a risk of gear shift operation failure. There is.

Here, an object of the present invention is to configure the first and second shift shafts so that they can be slid simultaneously with a single speed change lever with little mechanical error.

[Means to solve the problem]

The feature of the present invention is that the traveling transmission structure of the agricultural machine is configured as follows. In other words, a first shift shaft and a second shift shaft for traveling transmission that operate two types of gear transmission mechanisms arranged in series are provided in parallel to protrude from the side surface of the transmission case so as to be insertable and removable. An intermediate portion of the protruding portion of the second shift shaft is rotatable about a first axis that is substantially perpendicular to a plane including the first and second shift shafts, and is connected to the first and second shift shafts. A gear shift lever is arranged so as to be able to swing freely between two positions around a parallel second axis, and when the gear shift lever is switched to a first swing operation position around the second axis, the gear shift lever A first shaft protruding in opposite directions toward the first shift shaft side and the second shift shaft side.
The engaging portion and the second engaging portion engage with the first locking portion and the second locking portion provided on the first and second shift shafts, respectively, and the shift lever In the state switched to the second swing operation position, the first and second engaging portions are disengaged from the first and second locking portions, respectively, and the third locking portions provided on the first and second shift shafts are disengaged from the first and second locking portions. A gear shifter configured such that a third engaging part protruding from the gear shift lever is commonly engaged with the stop part and the fourth engaging part, and covers above the protruding parts of the first and second shift shafts. A guide plate is provided, the third engaging part extends to the vicinity of the gear change guide plate, and a display part is provided on the gear change guide plate so that the gear change state can be visually checked based on the position of the tip of the third engaging part. The functions and effects are as follows.

[For production]

When the shift lever (42) configured as described above is operated to the first swing operation position (A), the first and second engaging portions (44) of the shift lever (42) are moved as shown in FIG. , (45
) engage with the first and second locking portions (47), (48) of the first and second shift shafts (39), (40).

In this case, the gear shift lever (42) is connected to the first shift shaft (39).
Since it is located between the first and second shift shafts (40), by rotating the shift lever (42) around the first axis (P1), the first and second shift shafts (39) ,(4
0) at the same time and in opposite directions (see Fig. 4).

Conversely, when the gear shift lever (42) is switched to the second rocking operation position (B) as shown in FIG. axis (39),
(40) Third and fourth locking portions (49). (50)
engages with both. In this case, one third engaging portion (46
) engages with the third and fourth locking parts (49) and (50), so by rotating the gear shift lever (42) around the first axis (P1), the first and second locking parts (49) and (50) are engaged. Shift axis (3
9) and (40) can be slid simultaneously and in the same direction (see Fig. 5).

The third engaging portion (46) is connected to the gear shift lever (
42), the tip of the third engaging portion (46) (
By providing a display section (53) corresponding to 46a), the operator can confirm the gear shift state by visually observing this tip (46a). In this case, the third shift shaft for gear change operation engages with the first and second shift shafts (39) and (40).
Since the engaging portion (46) also serves as an indicator for visual inspection of the gear shift state, a dedicated indicator or the like is not required.

〔Effect of the invention〕

As described above, by directly engaging the plurality of engaging parts provided on the gear shift lever with the first and second shift shafts and sliding them without using a cam-type operation plate, etc., it is possible to prevent gaps and backlash. The occurrence of mechanical errors such as these has been reduced, and gear shifting operations can now be performed with fewer defects even after long-term use.

Furthermore, it is possible to omit a dedicated index section for visually checking the gear shift state, and the structure can be simplified.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of the present invention will be described based on the drawings using a walking type agricultural working machine, which is one type of agricultural working machine.

As shown in Fig. 9, a frame (2) extends forward from the mission case (1), and the engine (3) is mounted on this frame (2).
A traveling transmission case (5) equipped with wheels (4) at the bottom of 1).
) are connected to each other, and a control handle (6>) is provided on the upper part of the mission case (1), thereby constructing a walking agricultural machine.

Next, to explain the transmission structure of the PTO system in detail, as shown in Figure 9 and Figure 1O, power is transmitted from the engine (3) to a multi-disc clutch (7) and a PTO pulley (8). The signal is then transmitted to the input shaft (9) of the PTO transmission mechanism. A 1st IPTO shaft (10) is installed in parallel to this input shaft (9), and a high-speed gear for PTO (10) is connected to this 1st PTO shaft (10).
1) and a PTO low speed gear (12) are fixed.

On the other hand, the input shaft (9>) has a PTO shift gear (
l3) is slidably fitted onto the spline structure.

Therefore, by engaging the PTO shift gear (l3) with the PTO high speed gear (l1) or the PTO low speed gear (l2), the working device (not shown) is connected to the hitch (l4) shown in FIG. The power can be shifted to two speeds: high and low.

Next, to explain the transmission structure of the traveling system in detail, as shown in FIGS. 8 and 9, the power from the PTO pulley (8) is transmitted to the traveling system pulley (16) via the transmission belt (15).
and is transmitted to the input shaft (17) of the driving system transmission mechanism. The power is then transmitted to the second PTO shaft (20) via the first bevel gear (18) and the second bevel gear (19). A first shift gear (33) is attached to the second PTO shaft (20) with a spline structure so as to be slidable.

Then, the first transmission shaft (21) is connected to the second PTO shaft (20).
) and a second transmission shaft (22) are arranged in parallel, and the first transmission shaft (2l) has a first gear pair (23) and a first transmission gear (
24) is fitted onto the outside so as to be relatively rotatable, and a second shift gear (34) and a third shift gear (35) are attached with a spline structure so as to be slidable. or,
A second gear pair (25) and a second transmission gear (26) are fixed to the second transmission shaft (22), and the first gear pair (23) and the second transmission gear
The gear pair (25), the first transmission gear (24) and the second transmission gear (26) are in mesh.

The second transmission shaft (22) is equipped with an output gear (2) which will be described later.
A third transmission gear (28) that meshes with the third transmission gear (28) is fitted onto the outside so as to be relatively rotatable, and a fourth transmission gear (29) and a fifth transmission gear (30) are fixed to the third transmission gear (28). ing. In this mission case (1), the output part (3l) for driving is deviated to the left side of the body (to the left in the drawing) and protrudes downward from the lower surface of the mission case (1). A cylindrical output shaft (32) having a spline structure on its inner surface is installed in a horizontal frame in this output part (31), and the output gear (27) is attached to this output shaft (32).
) is fixed.

With the above structure, while the first shift gear (33) of the second PTO shaft (20) is engaged with the first gear pair (23), the second shift gear (34) is connected to the first gear pair (23) or the first gear pair (23). The third shift gear (35) is engaged with the transmission gear (24).
) is engaged with the fourth transmission gear (29) or the fifth transmission gear (30), the power can be shifted to four forward speeds and transmitted to the output shaft (32). On the contrary, the first shift gear (3
3) is engaged with the second gear pair (25), and by performing the same operation, the power can be shifted to four reverse gears and transmitted to the output shaft (32).

The state shown in Figure 8 is the driving transmission case (5) for l-wheels.
The input shaft (36) is inserted into the output shaft (32), and the traveling transmission case (5) is connected to the left side of the output section (3l) as viewed in the drawing. In this traveling transmission case (5), an axle (37) is made to protrude from the lower end to the right in the drawing, so that the wheels (4) are located at the left-right center (CL) of the machine body. With the above structure, power from the output shaft (32) is transferred to the input shaft (36) of the traveling transmission case (5),
It is transmitted to the axle (37) via the transmission chain (38).

Next, the sliding operation structure of the second shift gear (34) and the third shift gear (35) mentioned above will be explained in detail. 1st.
3.7 As shown in Figure 7, the first shift shaft (3) is equipped with a shift fork (54) that engages with the second shift gear (34).
9) and a second shift shaft (40) having a shift gear (55) that engages with a third shift gear (35) protrudes in parallel from the side surface of the transmission case (1).

and the first and second shift shafts (39). (40), the first and second shift shafts (39), (4
A first boss member (41) is attached to be able to swing freely around a second axis (P2) parallel to 0), and a second boss member (51) is swingably attached to this first boss member (4l). The gear shift lever (42) is fitted into the second boss member (51) with a spline structure. This allows the first
and a second shift shaft (39). The gear shift lever (42) can be rotated around the first axis (P1) that is substantially perpendicular to the plane including (40). Then, the second boss member (5l
) is fixed to a bracket (43), and a first engagement portion ( A first pin (44) and a second pin (45) are fixed.

The state shown in FIGS. 1 and 3 is a state in which the gear shift lever (42) is operated to the first swing operation position (A) around the second axis (P2), and the first and second shift axis (39),
(40) First locking part (47) and second locking part (48)
The first pin (44) and second pin (45) of the bracket (43) are engaged with each other. This allows the gear shift lever (
42) around the first axis (P,), the fourth
As shown in the figure, first and second shift shafts (39). (4
0) at the same time and in opposite directions.

In this state, a forward or reverse 1st speed state or 4th speed state is obtained. In other words, in the 1st speed state, the first shift shaft (39) is pulled out from the transmission case (1) (the second shift gear (34) in Fig. 8 engages with the first transmission gear (24)), and the second
The shift shaft (40) is pushed into the transmission case (1) (the third shift gear (35) in FIG. 8 engages with the fifth transmission gear (30)).

Conversely, in the 4th gear state, the first shift shaft (39) is pushed into the transmission case (1) (the second shift gear (34) in Fig. 8 engages with the I gear pair (23)), and the second shift gear (34) engages with the I gear pair (23). The shaft (40) is removed from the mission case (1) (8th
The third shift gear (35) in the figure meshes with the fourth transmission gear (29)).

Next, operations in the second and third speed states of forward or reverse will be described in detail. As shown in FIG. 1.3.7, a fourth locking portion (50) extends from the end of the second shift shaft (40) along the longitudinal direction of the second shift shaft (40), and A third locking portion (49) having an L-shape in plan view extends from the end of the first shift shaft (39), and the third locking portion (49) and the fourth locking portion (50) are connected to each other. are arranged so that they overlap in the vertical direction. The bracket (43) has a third engagement portion (46).
A rod has been erected.

With the above structure, the gear shift lever (4
2) to the second swing operation position (B) around the second axis (P2)
When operated, the first and second pins (44) and (45) come off from the first and second locking parts (47) and (48), and the rod (46) disengages from the third and fourth locking parts (47) and (48). 49). (50
). As a result, when the gear shift lever (42) is rotated around the first axis (P,) as shown in FIG. 5, the first and second shift shafts (39) and (40) are simultaneously operated. They can be slid in the same direction.

In this state, a forward or reverse 2nd speed state and 3rd speed state are obtained. In other words, in the 2nd speed state, the first and second shift shafts (
39) and (40) are pulled out from the transmission case (1) (the second shift gear (34) in Fig. 8 engages with the first transmission gear (24), and the third shift gear (35) engages with the fourth transmission gear (24)).
meshes with the transmission gear (29)).

Conversely, in the third speed state, the first and second shift shafts (39), (
40) is pushed into the mission case (1) (8th
The second shift gear (34) in the figure meshes with the first gear pair (23), and the third shift gear (35) engages with the fifth transmission gear (30).
occlusion〉

As mentioned above, the second and third shift gears (34), (3
When performing the sliding operation in step 5), the second shift gear (34) and the first gear pair (34) in the neutral state are shifted as shown in FIG.
23) and the distance (1,) from the first transmission gear (24);
The third shift gear (35) and the fourth and fifth transmission gears (29)
). In the interval (l2) with (30), the interval (lI
) is set smaller than the interval (12).

As a result, the second and third shift gears (3
4), (35) do not engage with the first gear pair (23), the fourth transmission gear (29), etc. at the same time, but the third shift gear (35) engages with the fourth or fifth transmission gear (29). (30
), and then the second shift gear (34) engages with the first gear pair (23) or the first transmission gear (24).

As described above, the gear shifting operation for driving in four forward and four reverse speeds can be performed. In this case, as shown in FIG. The gear shift lever (42) and the third and fourth locking parts (49) may be inserted into the inside of the gearshift lever (42) or the third and fourth locking parts (49) and (50) may be overlapped. ), (50
), etc., to minimize the space required.

As shown in FIGS. 1 and 6, a speed change guide plate (52) is provided to cover the upper part of the first and second shift shafts (39) and (40), and the speed change guide plate (52)
An H-shaped opening is provided as a display section (53).

As a result, when the gear shift lever (42) is operated from the 1st speed state to the 4th speed state as described above, the 1st
1st speed position (53 I) corresponding to the 4th speed state from the speed state
, 2nd speed position (53I[ ), 3rd speed position (53II[ )
), rod (46) near the 4th gear position (53IV')
The tip (46a) of the gear is positioned so that the operator can visually confirm the gear change state.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the traveling transmission structure for an agricultural working machine according to the present invention, and FIG. 1 is a side view showing the transmission lever being operated to the first swing operation position, and FIG. 2 is a side view showing the transmission lever being operated to the first swing operation position. FIG. 3 is a side view showing a state in which the shift lever is operated to the second swing operation position, FIG. 3 is a plan view showing a state in which the gear shift lever is operated to the first swing operation position, and FIG. FIG. 5 is a plan view showing a state in which the gear shift lever is oscillated around the first axis from the state shown in FIG. 2, and FIG. FIG. 6 is a plan view of the vicinity of the gear shift guide plate, FIG. 7 is a longitudinal rear view of the gear lever, first shift shaft, and second shift shaft, and FIG. 8 is a longitudinal front view of the transmission case. FIG. 9 is an overall side view of the walking agricultural machine, and FIG. 10 is a vertical sectional side view of the PTO transmission system in the mission case. (1)...Mission case, (39)...
...First shift shaft, (40)...Second shift shaft, (42)...Shift lever, (44)...
...first engagement part, (45)...second engagement part,
(46)...Third engaging portion, (46a)...
... Tip of third engaging part, (47)... First locking part, (48)... Mark, second locking part, (49)...
・Third locking part, (50)...Fourth locking part, (5
2)...Shift guide plate, (53)...Display section, (P1)...First axis, (P2)...
...Second axis, (A)...First swing operation position, (B)...Second swing operation position.

Claims (1)

[Claims] A first shift shaft (39) and a second shift shaft (40) for traveling transmission that operate two types of gear transmission mechanisms arranged in series.
are provided in parallel to protrude from the side surface of the mission case (1) so that they can be inserted and removed, and the first and second shift shafts (39), (
40), which is freely rotatable around a first axis (P_1) that is substantially orthogonal to the plane containing the first and second shift axes (39) and (40), and A second axis parallel to the first and second shift axes (39) and (40)
The gear shift lever (4) can be freely switched between two positions around P_2).
2) and the shift lever (42) is switched to the first swing operation position (A) around the second axis (P_2), the shift lever (42) is moved from the first shift shaft (39) side and the second shift shaft (40) side, the first engaging portion (44) and the second engaging portion (45) protrude in opposite directions to the first and second shift shaft (40) sides. 39), (40
) A first locking part (47) and a second locking part (48) provided in
, and the gear shift lever (42) is engaged with each of the second shaft center (
P_2) When the first and second engaging portions (44), (4
5) are disengaged from the first and second locking parts (47) and (48), respectively, and the first and second shift shafts (39) and (4
The third locking part (49) and the fourth locking part (50
), the third engaging portion (46) protruding from the shift lever (42) is configured to commonly engage with the protruding portions of the first and second shift shafts (39) and (40). A gear change guide plate (52) is provided to cover the upper part of the third engaging part (4).
6) is extended to the vicinity of the shift guide plate (52), and a display section (53) that allows the shift state to be visually checked based on the position of the tip (46a) of the third engaging portion (46) is attached to the shift guide plate (52). A traveling transmission structure for agricultural machinery installed in