JPS6363774B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for adding a creep gear set when it is possible to add an extremely low creep speed to an agricultural tractor as a variable speed.

(b) Conventional technology Conventionally, as a technology that loads gears such as creep stage shifting, there is a technology such as Utility Model Publication No. 54-134873 and Japanese Patent Application Laid-Open No.
A technique such as that disclosed in Japanese Patent No. 51-136075 is known.

(c) Problems to be solved by the invention Creep speed is necessary for special operations such as digging trenches with a trencher, digging dark beams, and putting onions into soil, and it is necessary in all regions. Therefore, it is not a standard specification but an additional specification.

This has been an additional specification for the past, and the creep gear set was inserted from the side of the transmission case to perform creep shifting, but creep shifting was not turned on or off from the transmission case side. In most cases, the creep speed is changed by sliding a sliding gear that is permanently installed in the vehicle, and it is assumed that the speed change lever and the speed change lever guide plate are set at a creep speed from the beginning. A rotating section to the transmission section was provided as a preliminary provision.

In such a configuration, the parts for the creep transmission system, which are not known whether to be added or not, are already installed on the tractor that does not require the creep system, and the cost increases due to unnecessary parts.

In order to solve this problem, the present invention provides the sliding gear, shifter shaft, shifter, and shifter arm for creep gear set on the creep gear set side, so that no creep parts remain in the standard type agricultural tractor. This is what I did.

In addition, the shift lever device is configured so that the shift lever for creep engages with the shifter arm for creep on the outside of the transmission case so that no shift parts for creep remain on the standard type tractor. It can be retrofitted to the gear shift lever, and the double engagement prevention plate can also be fixed to the outer wall of the transmission case as a retrofit.

(d) Means for Solving the Problems The objects of the present invention are as described above, and the configuration for achieving the objects will now be explained.

In a configuration in which a creep gear set 3 equipped with a creep shift shifter arm 54 can be inserted and removed into a side opening of the transmission case 1,
A shift lever 70 that can be rotated back and forth and left and right is interlocked with a shift lever shaft 50 that extends through the transmission case 1 in the left and right direction, and the shift lever shaft 50 is permanently installed at a position where it protrudes into the transmission case 1. The shift lever 58 of the device is fixedly installed, and by moving the shift lever 58 to the left and right, the shifter shafts 56, 5 of the permanently installed transmission device are moved.
7 engaging bodies 56a, 57a, and shift lever 5
The gears are selectively engaged by the forward and backward rotation of 8, and the shift lever 52 of the creep transmission device is attached to the position where the shift lever shaft 50 comes out from the transmission case 1, and only when the shifter shafts 56 and 57 are in neutral. A double engagement prevention plate 53 provided with a passage groove 53a through which the gear shift lever 52 can pass is attached to the wall of the transmission case 1, and at a position further outside of the double engagement prevention plate 53,
The shifter arm 54 of the creep transmission device is arranged so that the shift lever 52 can be engaged only in a position where the shift lever 58 is disengaged from the engaging bodies 56a, 57a.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is a side sectional view of the rear part of the transmission case and the front part of the rear axle case of the present invention.

In FIG. 1, there is a first-stage transmission in front of the portion of the transmission case 1 shown in the drawing, and the rotation after shifting in this first-stage transmission is shifted to the shaft 5. The signal is input to a second-stage permanent transmission installed in the rear compartment of the system case 1.

The shaft 5 has a bearing hole in the portion of the shaft that projects into the rear chamber of the transmission case, and the tip of the pinion shaft 6 is supported in this bearing hole via a needle bearing.

Further, a fixed gear 14 is carved into the rear chamber protrusion of the shaft 5.

In addition, a counter shaft 7 extending from the front chamber is installed in the upper part of the rear chamber of the transmission case 1, and the shaft 5,
Gear changes are performed between the pinion shaft 6 and the counter shaft 7.

The transmission system of the second-stage permanent transmission will be explained.

First, the third forward speed is the fixed gear 14a at the rear end of the shaft 5.
A sliding body 45 spline-fitted to the front end of the pinion shaft 6 meshes with the front end of the pinion shaft 6, so that the shaft 5 and the pinion shaft 6 are integrated and power is transmitted.

The second forward speed is transmitted from the fixed gear 14 of the shaft 5 to the fixed gear 15 spline-fitted to the counter shaft 7, and the spline-fitted sliding body 20 on the counter shaft 7 meshes with the internal teeth 18a of the loose-fit gear 18. As a result, the rotation of the counter shaft 7 is transmitted from the internal teeth 18a to the fixed gear 21 on the pinion shaft 5 via the loosely fitted gear 18, resulting in the second forward speed.

For the first forward speed, power is transmitted from the fixed gear 16 on the counter shaft 7 to the loosely fitted gear 17 on the pinion shaft 6, and the external teeth 17a of 17 mesh with the sliding body 45, so that the first forward speed is transmitted to the pinion shaft. Reportedly.

The reverse speed is determined by the loosely fitted gear 19 on the counter shaft 7.
Since a back gear is interposed between the fixed gear 22 on the pinion shaft 6 and the fixed gear 22 on the pinion shaft 6, the sliding body 20 is
It is obtained by meshing with.

Next, the transmission system of the creep transmission device obtained by attaching the creep gear set 3 to the transmission case 1 will be explained.

The creep speed can be determined by fixing the creep gear set 3 to the side wall of the mission case, so that when the sliding gear 27 of the creep gear set 3 is engaged with the fixed gear 16 on the counter shaft 7, the The set gear 28 is driven and the loosely fitted gear 3 on the shaft 31
2 and 29, the fixed gear 21 on the pinion shaft 6 is rotated to a creep speed.

Rotation of the pinion shaft 6 is transmitted by the pinion 33 to the ring gear 11 of the differential device. The rotation of the counter shaft 7 is transmitted to the shaft 9 by the connecting shaft 8.

A PTO hydraulic clutch device 36 is interposed between the connecting shaft 8 and the shaft 9.

The fixed gears 37 and 38 on the shaft 9 and the loosely fitted gears 39 and 41 on the PTO shaft 10 are always in mesh with each other, and the sliding body 40
The height of PTO shifting can be obtained by sliding the front and back.

The PTO rotation described above is an independent PTO that is not linked to the running speed, but a ground PTO that is linked to the running speed is also available.

Since the fixed gear 26 on the shaft 12 is always in mesh with the fixed gear 22 on the pinion shaft 6, the pinion rotation is taken out to the shaft 12 and transferred to the sliding body 4 via the shaft 13.
When the sliding body 42 meshes with the internal teeth of the loosely fitted gear 44, the power is transmitted to the fixed gear 47 on the PTO shaft, resulting in ground PTO rotation.

Also, the fixed gear 26 on the shaft 12 also serves to take out the power to the front wheel drive, and the fixed gear 25 on the shaft 12 also meshes with the loosely fitted gear 35 on the shaft 48 of the power extraction gearbox, and the sliding Front wheel driving force is extracted by sliding of the moving body 35a.

Figure 2 is a sectional view of the inside side of the creep gear set 3, Figure 3 is a sectional view of the front side, Figure 4 is a side view of the gear shift lever 50, and Figures 5 and 6 are of the shifter shaft of the creep gear set. FIG.

In FIG. 3, the shift lever shaft 50 of the shift lever 70 extends through the transmission case 1 from the left side to the right side, and is slidable in the left-right direction.

It is also possible to rotate in the front-back direction. A shift lever 58 for the second stage permanent transmission is provided inside the transmission case 1.
The tip of the gear shifter shaft 56 of the permanent transmission device,
57 engaging bodies 56a, 57a can be selectively engaged.

A shifter extending from the engaging body 56a of the speed change shifter shaft 56 slides the sliding body 45 on the pinion shaft 6 back and forth to select the first forward speed and the third forward speed.

Further, the shifter extending from the engaging body 57a of the speed change shifter shaft 57 is connected to the sliding body 20 on the counter shaft 7.
Slide back and forth to select 2nd forward speed and reverse speed.

The shift lever shaft 50 is attached to the portion where it protrudes outward from the transmission case 1, and is attached to the shift lever 52 of the creep transmission device, and a passage groove 53 through which the shift lever 52 can pass only when the permanent transmission device is in the neutral position.
A double mesh prevention plate 53 is provided.

When the shift lever shaft 50 of the shift lever 70 moves further outward than the shifter shaft 56, the shift lever shaft 5
Shift lever 5 of the creep transmission device attached to 0
2 passes over the double engagement prevention plate 53 and enters the engagement groove of the shifter arm 54 of the creep transmission.

In this case, the shifter shafts 56, 5 of the permanent transmission
7 is in the neutral position, there is a passage groove 53a in the center of the double engagement prevention plate 53 corresponding to the neutral position,
The shift lever 52 can only be engaged with the creep shifter arm 54 only when the shift lever 58 that operates the shift lever 57 is in the neutral position.

Similarly, when shifting from a creep shift to a normal shift, the shift lever 58 cannot engage the shifter shafts 56, 57 unless the creep shifter arm 54 returns to the off position.

The above configuration prevents double meshing. This structure to prevent double engagement can also be retrofitted.

That is, the base 51 of the shift lever 52 of the creep transmission device is fitted onto the shift lever shaft 50 and connected to the pin 51a.
The double engagement prevention plate 53 may also be fixed to the transmission case 1 with bolts 53c, 53c.

In this way, the shifter arm 54 for creep is provided outside the creep gear set, and the shift lever 54 is provided outside the creep gear set.
2 and the double engagement prevention plate 53 are provided on the outside of the transmission case 1, so all of these creep parts can be retrofitted and can be removed in the case of standard specifications that do not require creep. .

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, since the shift lever 70 of the permanent transmission device is used as is, the shift lever 52 is attached to it, and the double engagement prevention plate 53 is attached to the transmission case 1, the shift lever 70 is used as a creep shift lever. In addition, a double meshing device could be constructed without providing a shift lever for creep shifting.

Second, the creep gear shifter arm 54 is provided in the creep gear set 3, and the interlocking structure between the creep gear shifter arm 54 and the shifter arm of the permanent transmission can be performed outside the transmission case. Shift lever 52 for creep
It is now possible to retrofit the double mesh prevention plate 53, and in the standard type which does not require creep, all of these parts for the double mesh prevention device can be removed without leaving them on the transmission case side. It is.

Third, a double mesh prevention device is installed in the transmission case 1 to prevent double meshing between the transmission gear for the permanent transmission and the transmission gear for the creep transmission.
The double engagement prevention plate 53 attached to the shift lever shaft 50 and the shift lever 52 attached to the shift lever shaft 50 make it possible to attach the gear shift lever with a simple structure.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the rear part of the transmission case and the front part of the rear axle case of an agricultural tractor.
The figure is a sectional view of the inside side of the creep gear set.
The figure is also a front sectional view, and FIG. 4 is the gear shift lever 50.
The side views of FIGS. 5 and 6 are cross-sectional views of the shifter shaft portion of the creep gear set. 1... Mission case, 3... Creep gear set, 27... Sliding gear, 50... Speed change lever shaft, 52
...Shift lever for creep, 53...Double engagement prevention device, 54...Shifter arm for creep, 70...Shift lever.

Claims (1)

[Claims] 1 In a configuration in which the creep gear set 3 equipped with the creep gear shifter arm 54 can be inserted and removed into the side opening of the transmission case 1, the gear shift lever 70, which can be rotated back and forth and left and right, is inserted into the transmission case 1. A shift lever 58 of a permanent transmission is fixedly connected to a shift lever shaft 50 extending in the left and right direction of the shift lever shaft 50, and a shift lever 58 of a permanent transmission is fixed at a position where the shift lever shaft 50 projects into the transmission case 1. Due to the movement of the shifter shaft 5 of the permanent transmission
6 and 57 are selected, and the gears are selectively engaged by rotating the gear lever 58 back and forth.
A shift lever 52 of the creep transmission device is attached to the position where the shift lever shaft 50 comes out from the transmission case 1, and a passage groove 53a is provided through which the shift lever 52 can pass only when the shifter shafts 56, 57 are in the neutral position. A double engagement prevention plate 53 is attached to the wall of the transmission case 1, and the gear shift lever is installed at a position further outside of the double engagement prevention plate 53 only at a position where the shift lever 58 is disengaged from the engaging bodies 56a, 57a. Shifter arm 5 of the creep transmission that can be engaged by 52
A creep transmission device for an agricultural tractor, characterized in that 4 is arranged.