JPH0129626Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cover device for a transmission case used in a working vehicle such as an agricultural tractor.

Conventionally, the transmission case of this type of work vehicle has a structure in which the shifter rail is completely incorporated, so the gear change operation tool is not installed directly on the top side of the transmission case, but is installed in another part such as the fender, and the shifter rail and In the case where the gear shift operation tool is interlocked and connected via a connecting body such as a wire, the connecting part between the connecting body and the shifter rail is located inside the transmission case, so it is difficult to replace the connecting body, During inspection and maintenance such as adjustment, the cover body must be removed from the transmission case, which is cumbersome. In addition, when assembling the transmission case, the shifter rail must be set with the connecting body installed. It has to be assembled into the transmission case in a compressed state, which has the disadvantage that the degree of freedom in the assembly process is severely restricted. Therefore, it has been proposed to make one end of the shifter rail protrude from the transmission case and connect it to the coupling body, but in this case, a receiving member for receiving the coupling body is separately protruded from another member such as a step plate. It is necessary to attach the transmission case to the transmission case, which increases the number of parts and takes time and effort to assemble. New drawbacks arise, such as the need for an additional cover body.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation. In order to operate in conjunction with the operation, the cover body that closes the upper surface of the transmission case is connected to the transmission case via a connecting body such as a wire, and a portion that avoids the shifter oak installation part attached to the shifter rail is lowered. The end of the shifter rail is slidably passed through the step-like partition between the recess and the shifter oak mounting portion to face the recess, and the recess is formed between the shifter rail and the coupling body. It is characterized in that, while the connecting chamber is formed, a receiving portion for receiving the connecting body is formed on a rising edge formed at the edge of the recessed portion.

With this configuration, the present invention makes it possible to eliminate the drawbacks caused by the connecting portion between the shifter oak and the connecting body outside the cover.

Next, the present invention will be explained in more detail based on an embodiment shown in the drawings. In the drawing, 1 is a running body of an agricultural tractor, 2 is a bonnet that covers the engine mounted on the running body 1, 3 is a front wheel, 4 is a rear wheel, and 5 is a transmission that has a transmission mechanism 6 connected to the engine side. The case, 7 is a driver's seat, 8 is a driving handle, and 9 is an elevating link mechanism, all of which are arranged in the conventional manner.

The transmission mechanism 6 is adapted to receive power via a main shaft 10 that is interlocked with the engine. That is, the driving force of the main shaft 10 is generated by the gears 10a, 1
After being transmitted to the transmission shaft 11 via 1a, the gear 11 is integrally spline-fitted to the transmission shaft 11.
Shifter oak 15, 16 b, 11c will be described later
The transmission is selectively meshed with the transmission gear 12a or 12b of the transmission shaft 12, which is moved by the operation of the transmission shaft 12, so that the transmission is transmitted to the transmission shaft 12 side, and then
2 to the pinion shaft 14 via a shaft 13 by gear transmission or the like. Shifter oak 1 that engages with the speed change gears 12a and 12b
5 and 16 are roll pins 15a and 1 facing in the vertical direction.
They are fixed to shifter rails 17 and 18, respectively, via 6a.

A cover body 19 is fixed via a tightening bolt 19a to close the upper side of the transmission case 5, and the cover body 19 is attached to the main shaft 10 on which the shifter oaks 15 and 16 are installed, as shown in FIG. The side (front side) has a high convex portion 19b, whereas the pinion shaft 14 has no high convex portion 19b.
The side (rear side) is lowered and has a concave portion 19c.
is formed. The shifter rails 17 and 18 are attached to the cover body 19 so as to be slidable in the front and rear directions so that the shifter oaks 15 and 16 shift the speed change gears 12a and 12b by operating a speed change lever, which will be described later. The shifter rails 17, 18 have one end side, which is the side where the shifter oaks 15, 16 are attached, along the inner lower surface of the convex part 19b, and the other end side, which is the side where the control wire (to be described later) is attached, has a step between the convex part 19b and the concave part 19c. A concave portion 19c passes through the partition portion 19e that divides the
It's even close to the side. In this concave portion 19c, the projecting ends of the shifter rails 17 and 18 are
It is fitted into an engagement hole 20a formed in the metal fitting 20 and fixed integrally via tightening nuts 17a and 18a. Further, one end portions of inner wires 21 and 22 of push-pull wires constituting the control wire are screwed into screw holes 20b formed in each metal fitting 20, respectively. Also, the outer wire 21
One end portion of a, 22a is fixed to a rising edge 23 provided upright on the edge side of the recessed portion 19c as an outer support. In other words, the metal fitting 2 is attached to the rising edge 23.
A substantially U-shaped notch groove 23a is formed at a position corresponding to the screw hole 20b on the 0 side, and the notch groove 23a
A counterbore portion 23 whose axis substantially coincides with the screw hole 20b
b is provided, and a first groove is provided at the bottom of the notch groove 23a.
As shown in Figure 1 A, B, and C, the gap 23 for draining water
c are provided consecutively. One end of the outer wires 21a, 22a is connected to a flat washer 23d,
It is fitted and fixed in the notched groove 23a of the rising edge 23 via a tightening nut 23e. Inner wires 21, 22 and outer wire 21 attached to the transmission case 5 side in this way
In this embodiment, a pair of control wires consisting of a and 22a are connected to an ultra-low speed switch protruding from the upper surface of an auxiliary transmission case 24, which is integrally provided on the rear side of the transmission case 5, as shown in FIG. 6A or B. It extends rearward so as to sandwich the lever 25 from side to side. Reference numeral 26 denotes a top cover that covers the concave portion 19c, and the top cover 26 covers the convex portion 19.
b and the rising edge 23 by bolts 26a. Then, the top cover 28 and the convex portion 19
A vibration isolating material 27 made of a rubbery elastic material is interposed between the upper surface cover 26 and the convex portion 19b to prevent the top cover 26 from coming into contact with the convex portion 19b and generating noise when the aircraft body vibrates.
The vibration isolating material 27 is removably fitted into a through hole 19d formed in the cover body 19 so as to be located approximately at the mounting position of the shifter oaks 15 and 16, as shown in FIG. Reference numeral 25a is a guide pin protruding from the auxiliary transmission case 24 to prevent bending of the control wire, and 28 is a lubrication plug for the transmission case 5.

Reference numeral 29 denotes fenders that cover the left and right rear wheels 4, and among the fenders, in this embodiment, a speed change lever 30 is attached to the left fender 29. That is, on the left fender 29, a pair of brackets 31 are fitted with tightening tools 31 so as to sandwich an opening 29a formed on the upper front side of the left fender 29 from the left and right sides.
It is fixed via a. A support shaft 32 is rotatably supported on the bracket 31, and a support body 32b is provided astride a boss tube 32a which is rotatably inserted through the center of the support shaft 32. and gear lever 3
The base end 30b of the gear shift lever 30 is rotatably supported by the support 32b via the pin shaft 30a, so that the gear shift lever 30 can move in the front-rear direction (in the direction of arrow A-B) with the support shaft 32 as a fulcrum. ) and in the left-right direction (in the direction of arrow C-D) about the pin shaft 30a as a fulcrum, in response to a speed change operation to be described later. Furthermore, boss portions 33a and 34a of actuating arms 33 and 34 located on both left and right sides of the boss tube 32a are rotatably inserted through the support shaft 32, and locking pins protruding from the actuating arms 33 and 34 33b,
The other ends of the inner wires 21 and 22 are respectively fixed to the inner wires 34b, and locking grooves 33c and 34c are cut in the distal ends of the operating arms 33 and 34, respectively. Then, when the gear shift lever 30 is operated toward the outside of the aircraft body (in the direction of arrow C), the engagement pin 30c fixed to the gear shift lever 30 engages with the locking groove 33c on the outer operating arm 33 side. , when operating towards the inside of the fuselage (in the direction of arrow D), the engagement pin 30
c is adapted to engage with a locking groove 34c on the inner actuating arm 34 side.

Reference numeral 35 denotes a wire guide through which the pair of control wires are simultaneously inserted, and the wire guide 35 connects the side cover 36 and the left fender 29 from a position below the side cover 36.
Brackets 35a and 35b are introduced into the fender 29 through notched holes 29a and 36a, respectively, and are integrally provided at both ends of the fender 29, and are fixed to the fender 29 through bolts 35c for protection. By being attached to the member 37, it is fixed to the fender 29 side. Although the middle portion of the wire guide 35 is curved, the curvature is set so as not to inhibit the sliding movement of the inner wires 21 and 22. Also, Fender 2
The retaining plate 3 is integrally provided with the reinforcing member 38 of 9.
The other ends of the outer wires 21a and 22a are respectively fixed to the outer wires 8a via nuts 38b.
A cover 39 is integrally fixed to the bracket 31, and a shift guide plate 40 fixed to the cover 39 is provided with shift grooves. When the lever is operated in the left-right direction (in the direction of arrow C-D) to the reverse position R and the first speed position A as shown in FIG. When the actuating arm 33 is engaged with the groove 33c and the shift lever 15 is operated from this position A in the longitudinal direction (in the direction of arrows A-B) to be positioned at any of the above shift positions, the actuating arm 33 is integrated with the shift lever 30. As the inner wire 21 rotates, the inner wire 21 is pushed and pulled to slide one of the shifter rails 17, thereby shifting the transmission mechanism 6 to the corresponding reverse or first speed. Also, shift the gear lever 30 to 2nd and 3rd gear in the neutral groove.
When the gear shift lever 15 is placed in the speed side position B, the gear shift lever 15 is moved into the locking groove 34c of the inner actuating arm 34.
If the shift lever 30 is operated in the front-rear direction from this position B to any shift position, the other shifter rail 18 will then slide to shift the shift mechanism 6 to the corresponding 2nd or 2nd gear. It is designed to shift to 3rd gear. Moreover, the shift lever 30 of this embodiment is biased toward the outside of the fuselage (in the direction of arrow C in this embodiment) by the torsion mechanism 41 interposed between the base end 30b and the pin shaft 30a. , and when the gear shift lever 30 is in the neutral state, reverse and 1
It is adapted to engage with a neutral stop position N that is carved in a protruding manner outward from the guide groove for the speed.

In the embodiment of the present invention constructed as described above, the operator sitting in the driver's seat operates the gear shift lever 30 provided on the fender 29 on the left side of the driver's seat 7, which is spaced from the transmission case 5. The transmission mechanism 6 and the transmission lever 30 are connected to the inner wires 21 and 22 and the outer wire 21.
a and 22a, which are interlocked and connected by a control wire, but in this case,
Inner wires 21, 22 and shifter rails 17, 1
8 is formed in the concave portion 19c on the outside of the transmission case 5, not on the inside. That is, a concave portion 19c is formed in a portion of the cover body 19 that closes the upper side of the transmission case 5, avoiding the location where the shifter oaks 15 and 16 are disposed.
The end portions of the shifter rails 17 and 18 are penetrated into the inner wire 2 so that the protruding shifter rails 17 and 18 are accommodated in the concave portion 19c.
1 and 22 are connected, and this concave portion 1
9c is the connection room. For this reason, as with the conventional structure in which the entire shifter rail is provided inside the transmission case 5, when performing maintenance such as replacing or adjusting the control wire, the cover body 19 itself must be removed from the transmission 5 side and the transmission case 5 must be removed. When assembling the case 5, there is no need to use a set in which the shift rails 17, 18 and control wires are connected, and inspection and maintenance of the control wires can be easily performed by simply removing the top cover 26 from the cover body 19. In addition, the control wires can be easily connected to the shifter rails 17 and 18 even after the transmission case 5 is assembled, so there is no restriction on the degree of freedom in the assembly process. .

Moreover, the concave portion 19c is the shifter oak 1.
5 and 16, the convex part 19b is set higher to form the concave part 19c, and therefore the transmission case 5 becomes taller. Never happened. In other words, the concave portion 19c is the shifter oak 1
5 and 16, the upper space inside the transmission case 5 created by the absence of the shifter oaks 15 and 16 can be effectively utilized. Therefore, the convex portion 19b is purposely made higher and the concave portion 19c
This can be done without going against the miniaturization of the transmission case 5. Furthermore, part of the shifter rails 17 and 18 protrudes from the transmission case 5;
Because it is located on the upper surface of the rear side of the transmission case 5, rather than protruding laterally from the
Because of the protruding shifter rails 17 and 18, there is no need to secure a particularly large installation space for the transmission case 5, which is extremely convenient.

Regarding the control wire, an outer receiver for receiving the outer wires 21a and 22a is provided using the rising edge 23 forming the concave portion 19c, and therefore the connecting portion is exposed to the outside to improve maintainability. Although greatly enhanced,
There is no need to separately provide the outer receiving part in other parts such as the step plate, and the connection part can be handled in the same way as if it were inside the transmission case, which increases the number of parts and makes assembly complicated. There is no problem of fraying, and there is no need for a specially shaped cover body that extends from the transmission case to other parts in order to cover this connection part. A top cover 26 with a simple structure like this is sufficient.

Moreover, in the embodiment, the outer receiver is constituted by the notch groove 23a formed in the rising edge 23 and the counterbore portion 23b as described above, so even if the rear surface side of the rising edge 23 is inclined in consideration of mold removal. Even if the flat washer 23d is fitted into the counterbore portion 23a, the flat washer 23d sandwiching the rising edge 23 becomes parallel to the outer wire 2.
1a, 22a can be easily adjusted, and the mounting portions of the outer wires 21a, 22a can be mounted substantially parallel to the sliding direction of the inner wires 21, 22, in other words, the moving direction of the shifter rails 17, 18. This not only makes it easier to assemble and maintain the control wires, but also allows the inner wires 21, 22 to slide reliably without any excessive load being applied to the inner wires 21, 22.
This allows the gear change switching operation of the transmission mechanism 6 to be performed smoothly. Moreover, since the gap 23c formed at the bottom of the notch groove 23a serves as a drain for the concave portion 19c, the formation of the notch groove 23a is different from the case where a drain hole or a drain groove is purposefully provided in addition to the notch groove 23a. There is no need to perform molding in a separate operation, which simplifies the processing operation, reduces costs, and does not impair the strength of the cover body 19.

On the other hand, a vibration isolating material 27 is interposed between the upper surface cover 26 covering the concave portion 19c and the convex portion 19b.
Since the shifter oaks 15 and 18 are removably fitted into the through holes 19d of the cover body 19, which are bored at the installation positions of the shifter oaks 15 and 16, the shifter oaks 15 and 18 are removably fitted.
16 from the shifter rails 17 and 18 for disassembly and maintenance, the vibration isolating material 27 can be removed from the through hole 19d, and the roll pin 15 can be removed using this through hole 19d.
a, 16a can be extracted. Therefore, the 14th
Unlike the conventional example without through holes shown in the figure, there is no need for a margin for removing the roll pins 15a, 16a. Therefore, the thickness of the cover body 19 can be reduced, making it lightweight and compact, and the assembly and disassembly of the shifter oaks 15 and 16 is also facilitated.
Coupled with the fact that it can also be used as a cap for the 9d, it is extremely convenient.

Furthermore, the control wire consisting of the inner wires 21, 22 and the outer wires 21a, 22a extends rearward from the rising edge 23 of the cover body 19 and reaches the fender 29 side.
The cover body 19 attachment side of this control wire is connected to an ultra-low speed switching lever 25 and a guide pin 25a.
Since the control wire acts as a guide for passing through the wire, it does not bend more than necessary, and therefore the control wire does not bend near the mounting portion and the transmission mechanism 6
The switching operation of the control wire will not be hindered, and the durability of the control wire will not be impaired. Moreover, in this case, one of the control wire guides is the ultra-low speed switching lever 25.
Since it makes effective use of the components, parts can be used interchangeably, which is extremely convenient. Moreover, the control wire extends from the lower surface side of the side cover 36 to the upper surface side of the side cover 36 via the notch hole 36a, and further extends through the notch hole 29a.
However, since the control wire is routed through a wire guide 35 formed by appropriately curving a cylindrical member, the two notch holes 29a, 3
Even if the wire guide 35 is installed by penetrating the wire guide 35, the brackets 35a and 35b
It can be easily installed by simply fixing it to the fuselage side through the screws, making assembly and disassembly work easier. Moreover, inside the fender 29, there is no wear on the control wires due to mud and dirt carried around by the rear wheels 4. Moreover, the notch hole 29a of the control wire,
Since the position 36a is reliably protected by the wire guide 35, there is no possibility that the control wire will be bent or cut at this part due to external force, and the rear wheel 4 Even if muddy water or the like infiltrates from the upper end of the wire guide 35 on the inner wall side of the fender 29 due to the splashing of mud, the muddy water or the like will flow down inside the curved wire guide 35 and pass through the wire guide below the side cover 36. The liquid is discharged to the ground from the lower end of the battery 35, and there is no possibility that it will accumulate on the side cover 36 or the like.

In summary, since the present invention is constructed as described above, the connecting part between the shifter rail and the connecting body such as the control wire is exposed from the cover body, and inspection and maintenance such as replacement and adjustment of the connecting body and assembly can be carried out. Although it can be done easily and reliably, the part of the cover body that closes the upper surface side of the transmission case, avoiding the shift fork installation part, is lowered to form a concave part, and this concave part is Configured into a connection chamber for the connection part. Therefore, the space for forming this connection chamber can be secured by effectively utilizing the space created by the absence of a shift fork in the upper part of the transmission case. Even if the transmission case is provided with a connecting portion, there is no problem that the transmission case becomes taller and larger. Moreover, since the receiving part for receiving the connecting body is formed on the rising edge formed at the edge of the recessed part, even if the connecting part is exposed outside the case, the member for providing the receiving part is not required. There is no need for a separate cover, which allows effective use of the rising edge, avoids an increase in the number of parts, and further improves ease of assembly. It has the advantage that it can be made into a simple plate-like structure.

[Brief explanation of the drawing]

The drawing shows an embodiment of the transmission case cover device according to the present invention,
Figure 1 is an overall plan view of the agricultural tractor, Figure 2 is an overall side view of the same as above, Figure 3 is a plan view of the transmission case, Figure 4 is a longitudinal section of the same as above, and Figure 5 is a side view of the main parts of the machine. , Figures 6A and B are side views of the main parts of the same as above,
A side view of the main parts of another example, Fig. 7 is a longitudinal cross-sectional side view of the main parts of the transmission case, Fig. 8 is a longitudinal cross-sectional front view of the main parts of the same as above, Fig. 9 is a plan view of the main parts of the same as above, Fig. 10 is the inner wire connection Exploded view of parts, Figure 11 A, B, C
12 is a rear view, a cross-sectional side view, and a rear view of another example of the outer receiving portion, and FIG. 12 is a vertical cross-sectional view of the gear shift lever,
FIG. 13 is a view in the direction of the X arrow in FIG. 12, and FIG. 14 is a longitudinal sectional front view of a main part of a transmission case showing a conventional example. In the figure, 1 is a traveling body, 5 is a transmission case, 6 is a transmission mechanism, 15 and 16 are shifter oaks, 17 and 18 are shifter rails, 19 is a cover body, 21 and 22 are inner wires, and 30 is a gear shift lever.

Claims (1)

[Scope of utility model registration request] The transmission is configured to operatively connect the speed change operation tool and a shifter rail of the speed change mechanism housed in the transmission case via a connecting body such as a wire so as to operate in conjunction with the speed change operation of the speed change operation tool. On the cover body that closes the top side of the case,
A concave portion is formed by lowering a portion of the shifter rail that avoids the shifter oak mounting portion, and the end of the shifter rail is slidably passed through the stepped partition between the recess and the shifter oak mounting portion to form a recess. The concave portion is configured as a connection chamber between the shifter rail and the connecting body, and a receiving portion for receiving the connecting body is formed on the rising edge formed at the edge of the concave portion. Transmission case cover device.