JPS645149Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission device suitable for a PTO transmission device or the like installed at the rear of a rear axle case of an agricultural tractor.

Conventionally, when a selective sliding type using spur gears was used as a PTO transmission, there were problems with high noise and difficulty in shifting operations. The structure shown in Fig. 1 has already been adopted as a conventional three-stage PTO transmission. However, in that case, the two sliders 1 and 2
must be operated using two forks (not shown), which not only complicates the structure but also takes up a lot of space, which tends to increase noise.

This invention aims to reduce noise in a 4-speed PTO transmission by configuring each pair of gears with helical gears that are in constant mesh, and to enable shifting with a single shift fork. do.

In Figure 2, 5 is the PTO shaft on the driven side, 6 is the PTO pinion shaft on the driving side, and both shafts are bearings 7 to 10.
The rear end of the PTO shaft 5 (the right end in the diagram) protrudes rearward from the rear axle case.
The PTO pinion shaft 6 extends forward (to the left in the figure) via a connecting shaft and is connected to an engine (both not shown) through a PTO clutch. Helical first and third gears 1 are mounted on the PTO shaft 5 via needle bearings 11.
2 and 37 are fitted at the boss tubes 13 and 13',
Helical second and fourth gears 14 and 38 are rotatably fitted onto the boss cylinders 13 and 13' at the boss cylinders 15 and 15', and each gear 12, 14, 37, 38 is
Fixed PTO pinion 16 on PTO pinion shaft 6,
17, 39, and 40 are always engaged. A spline collar 18 is spline-fitted onto the PTO shaft 5.
The first and third gear boss tubes 13 between this spline collar 18 and the second and fourth gear boss tubes 15 and 15',
Splined claws 19, 19' are spline-fitted onto 13', and external splines 20, 21, 21 are provided on the outer peripheries of the spline collar 18, splined claws 19, 19', and boss cylinders 15, 15'. ′、
22, 22' specifications (outer diameter, root diameter, face width, number of teeth, etc.)
are arranged.

The slider 23 is attached to the external spline 20 of the spline collar 18 and the internal spline 24, 2.
4' and the shift fork 26 fitted into the annular groove 25 on the outer periphery allows the slider 23 to be moved from above the spline collar 18 to the spline toggle 1.
9, 19' up, and further the second and fourth gear boss tubes 1
5, 15'. An annular notch 27 is provided at the intermediate portion of the internal splines 24, 24', and when the internal spline 24' on the opposite side to the first and second gears 12, 14 meshes with the external spline 20, the other The internal spline 24 can be selectively engaged with the external spline 21 or the external spline 22. With the internal spline 24 meshing with the external spline 20, the other internal spline 24' is connected to the external spline 21' integrated with the third gear 37 or the external spline 22' integrated with the fourth gear 38. Can be selectively engaged.

If the PTO pinion shaft 6 is designed to rotate in the right direction (arrow A direction) when viewed from the engine side, the pinions 16, 17, helical third and fourth gears 37, 38
has right-handed helical teeth, and the pinions 39, 40 and helical first and second gears 12, 14 have left-handed helical teeth. Therefore, in the illustrated neutral state where the slider 23 is only on the spline collar 18, the first and second helical gears 12 and 14 receive thrust toward the thrust bearing 34, and the third and fourth helical gears 3
7 and 38 receive thrust toward the thrust bearing 35, and no friction occurs at both ends (B ₁ and B ₂ portions) of the spline collar 18.

With the rotational force of the engine being transmitted to the PTO pinion shaft 6, when the shift fork 26 drives the slider 23 in the direction of the arrow to engage the inner and outer splines 24' and 22', the PTO
The first speed is obtained. That is, the rotational force is transmitted from the pinion 40 to the PTO shaft 5 via the fourth helical gear 38, the slider 23, and the spline collar 18. Next, when the slider 23 is driven in the direction of the arrow to engage the inner and outer splines 24' and 21', the PTO
Second speed is obtained. At that time, the rotational force is pinion 39
It is transmitted to the PTO shaft 5 through the helical third gear 37, slider 23, and spline 18. When the slider 23 is driven in the direction of the arrow from the neutral state shown in FIG. 2 and the splines 24 and 21 are engaged, the third PTO speed is obtained. At that time, the rotational force is
The signal is transmitted from the PTO pinion 16 to the PTO shaft 5 via the first helical gear 12, spline claw 19, slider 23, and spline collar 18. When the slider 23 is further driven in the direction of the arrow and the splines 24 and 22 are engaged, the fourth PTO speed is obtained. At that time, the rotational force is transmitted from the PTO pinion 17 to the PTO shaft 5 via the second helical gear 14, slider 23, and spline collar 18. The thrust received by the first to fourth helical gears 12, 14, 37, and 38 during power transmission and in neutral is as follows:
It is supported by thrust bearings 34, 35, 36, 36'.

As explained above, in the present invention, the annular spline collar 18 that fits on the driven shaft 5,
A first helical gear 12 and a third helical gear 37 are respectively pivotally supported on both sides of the spline collar 18.
, helical first gear 12 and spline collar 18
A helical second gear 14 is pivotally supported between the helical third gear 37 and the spline collar 18, and a helical fourth gear 38 is pivotally supported between the helical third gear 37 and the spline collar 18. , second, third, fourth gears 12, 14, 37, 3
Helical fixed gears 16, 17, 3 that are always meshed with 8.
9 and 40 are provided on the drive shaft 6, respectively, and one slider 23 that is spline-fitted onto the spline collar 18 so as to be slidable only in the axial direction is slid, thereby performing four-speed shifting. In the device, a boss tube 13 is provided on the first helical gear 12 and protrudes toward the spline collar 18.
are provided concentrically and integrally, and the third helical gear 37
A boss tube 13' protruding toward the spline collar 18 is provided concentrically and integrally with each boss tube 13,
13', the second helical gear 14 and the fourth helical gear
The gears 38 are arranged rotatably, and boss tubes 15 and 15' facing each other are provided integrally and concentrically with the second and fourth helical gears 14 and 38, respectively. External tooth spline 22,
22' are provided respectively, and the boss tube 15 and spline collar 18 of the helical second gear 14 on the boss tube 13 are provided.
Fit the splined claw 19 between the boss tube 1
3' between the boss tube 15' of the fourth helical gear 38 and the spline collar 18.
and the internal spline 24 of the slider 23.
An annular notch 27 is provided in the middle of the slider 23.
The spline collar 1 is moved so that the internal spline 24 of the slider 23 on the helical second gear 14 side meshes with the external spline 21 of the splined claw 19 during the process of moving toward the helical second gear 14 side.
8 and splined spline 19 external spline 21
When the slider 23 is further moved toward the helical second gear 14 side and the external spline 21 of the splined tooth 19 is within the notch 27, the helical second gear 14 of the slider 23 is adjusted. Match the specifications of the spline collar 18 and the external spline 22 of the second helical gear 14 so that the internal spline 24 on the side meshes with the external spline 22 of the second helical gear 14, and In the middle of the movement toward the fourth gear 38 side, the slider 23 is connected to the spline collar 18 so that the internal spline 24' on the helical fourth gear 38 side meshes with the external spline 21' of the splined claw 19'. The specifications of the external spline 21' of the splined tooth 19' are adjusted, and the slider 23 is further moved toward the fourth helical gear 38, so that the external spline 21' of the splined tooth 19' is inserted into the notch 27. Sometimes slider 23
Internal spline 24' on the helical fourth gear 38 side
The slider 23 is characterized in that the specifications of the spline collar 18 and the external spline 22' of the fourth helical gear 38 are matched so that the external spline 22' of the fourth helical gear 38 meshes with the external spline 22' of the fourth helical gear 38. arrow by one shift fork 26,,
, it is possible to change gears in 4 steps simply by moving in the direction of . This not only greatly simplifies the transmission mechanism, but also simplifies operation. pinion 1
6, 17, 39, 40 and the first to fourth gears 12, 14, 37, 38 that mesh with them are helical gears that are always in mesh, so the space is reduced and noise is significantly reduced. During a gear shift operation, only the slider 23 needs to be driven, making the gear shift operation easier.

In addition, in the present invention, since the splined claw 19 is fixed on the first gear boss tube 13 between the spline collar 18 and the helical second gear 14, it can be integrated with the helical first gear 12. The operating external spline 20 can be made to have the same specifications as the external spline 22 of the second helical gear boss cylinder 15, and by simply providing an annular notch 27 in the middle of the internal spline of the slider 23, book shift fork 26
Therefore, when the slider 23 is moved, the internal spline 24 selectively engages with the external splines 21 and 22, which has the advantage of compactly forming two gear stages on one side of the slider 23. Since both the helical second gear 14 and the splined gear 19 are supported on the helical first gear boss cylinder 13, they can be held concentrically with high accuracy, and the gear shifting operation becomes smooth. The same applies to the right side of FIG.

Furthermore, according to the present invention, the helical first and third gears 1
2 and 37 are pivotally supported on both sides of the spline collar 18, the second helical gear 14 is mounted on the boss cylinder 13 that is integrated with the first helical gear 12, and the boss cylinder is integrated with the third helical gear 37. A fourth helical gear 38 is arranged on each of the second and fourth helical gears 14 and 13'.
Each tooth spline 22, 2 of the boss cylinder 15, 15'
2' and the internal splines 24, 2 of the slider 23.
4' is fitted to extract power, so when obtaining 2nd and 4th speeds, slider 2
3 can directly extract power from the second helical gear 14 or the fourth helical gear 38. Therefore, the slider 23 and the second helical gear 14 or the fourth helical gear
Since there is no sleeve between the gear 14 and the gear 14, it is possible to prevent transmission loss of rotational force, and furthermore, it is possible to minimize the wobbling of the spline portion in the rotational direction. Furthermore, since the number of parts is small, the structure is simple and assembly is easy.

Furthermore, according to the present invention, the boss cylinder 13 that supports the second helical gear 14 and the boss cylinder 13' that supports the fourth gear 38 are connected to the first helical gear 12 and the third helical gear
Since they are each formed integrally with the gear 37, and the axial dimension is set to be long by the dimension that supports the second and fourth gears 14 and 38, the support span becomes long and a stable support structure is obtained. be able to.

In short, in this invention, Hasuba 1st and 3rd
The gears 12, 37 and the boss cylinders 13, 1 integrated therewith
3', and second and fourth helical gears 14 and 38 are rotatably supported on these boss cylinders 13 and 13',
Each of the second and fourth helical gears 14 and 38 is provided with a boss cylinder 15 and 15' integral therewith, and each boss cylinder 15 and 1
Externally toothed splines 22, 22' are provided on the outer periphery of the tip of 5', which reduces transmission loss, prevents rattling, and provides a stable support structure with a small number of parts and easy assembly. It is.

In addition to the PTO transmission device for agricultural tractors, this invention is also applicable to
The present invention can be similarly applied to a transmission for driving.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional example, and FIG. 2 is a longitudinal sectional view of a transmission according to the present invention. 5...
PTO shaft (driven shaft), 6...PTO pinion shaft (drive shaft), 12, 14, 37, 38... Hasuba 1st,
2nd, 3rd, 4th gears, 13, 13'...boss tube,
16, 17, 39, 40... Pinion (fixed gear), 18... Spline collar, 19, 19'...
...Spline Tsug, 20, 21, 21', 22,
22'... External spline, 24, 24'... Internal spline, 27... Annular notch.

Claims (1)

[Scope of utility model registration request] An annular spline collar 18 that fits onto the driven shaft 5, a first helical gear 12 and a third helical gear 37 supported on both sides of the spline collar 18, respectively, and the first helical gear 12. and a helical second gear 14 supported between the spline collar 18 and the spline collar 18;
A fourth helical gear 38 is pivotally supported between a third helical gear 37 and a spline collar 18.
Helical fixed gears 16, 1 that are constantly meshed with 7, 38
7, 39, and 40 are provided on the drive shaft 6, respectively, and one slider 23 that is spline-fitted onto the spline collar 18 so as to be slidable only in the axial direction is slid, thereby performing four-stage gear shifting. In the transmission, the helical first gear 12
A boss tube 13 protruding toward the spline collar 18 is provided concentrically and integrally with the third helical gear 37, and a boss tube 13' protruding toward the spline collar 18 is concentrically and integrally provided with each boss tube. The second helical gear 14 and the fourth helical gear 38 are rotatably arranged on the second and fourth helical gears 13 and 13', respectively, and the second and fourth helical gears 14 and 38 are provided with boss tubes 15 and 15 facing each other. 15' are provided integrally and concentrically, and external splines 22, 22' are provided on the outer periphery of both boss tubes 15, 15', respectively, and the boss tube 15 of the helical second gear 14 on the boss tube 13 and the spline collar are provided. Fit the splined claw 19 between 18,
Boss tube 1 of helical fourth gear 38 on boss tube 13'
5' and the spline collar 18, an annular notch 27 is provided in the middle of the internal spline 24 of the slider 23, and the slider 23 moves toward the helical second gear 14. During the stroke, the helical second gear 14 of the slider 23
The internal tooth spline 24 on the side is the spline tooth 19
The specifications of the spline collar 18 and the external spline 21 of the splined tooth 19 are adjusted so that the spline collar 18 and the external spline 21 of the splined tooth 19 mesh with each other, and the slider 23 further moves toward the second helical gear 14 and engages with the outside of the splined tooth 19. When the toothed spline 21 is in the notch 27, the spline collar 18 and the second spline are engaged so that the internal spline 24 of the slider 23 on the side of the second helical gear 14 and the external spline 22 of the second helical gear 14 mesh with each other. 2. Match the specifications of the external spline 22 of the helical gear 14, and the slider 23
During the process of moving to the gear 38 side, slider 2
3 internal spline 2 on the helical fourth gear 38 side
4' is the external spline 2 of the splined tooth 19'
1', the dimensions of the spline collar 18 and the external spline 21' of the splined tooth 19' are matched, and the slider 23 further moves toward the fourth helical gear 38 and engages with the external spline 21' of the splined tooth 19'. When the toothed spline 21' is in the notch 27, the spline collar is set so that the internal spline 24' on the fourth helical gear 38 side of the slider 23 and the external spline 22' of the fourth helical gear 38 mesh with each other. 1
8 and the external spline 22' of the fourth helical gear 38
A transmission device characterized by having the following specifications.