JPH0537083Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a lubricating device for a transmission part of a tractor.

Conventional technology Conventionally, in a tractor transmission, a clutch case and a transmission case are sequentially connected to the rear of the engine, and the clutch mechanism and the first transmission mechanism are housed in the clutch case. Generally, a second transmission mechanism is housed in the transmission mechanism to perform multi-stage transmission. Here, the clutch case is partitioned by a partition into a front chamber that houses the clutch mechanism and a rear chamber that houses the first transmission mechanism.
A lubricating oil reservoir containing lubricating oil is provided at the bottom of the rear chamber and the bottom of the transmission case. This lubricating oil is splashed up by a rotating member that rotates during power transmission, and lubricates the first transmission mechanism and the second transmission mechanism. In addition, since the first transmission mechanism is arranged above the rear chamber, one end of the rotating shaft that constitutes a part of the second transmission mechanism protrudes into the rear chamber, and one end of this rotating shaft has lubricant splashed onto it. The lifting gear has blades, etc. attached.

Problems that the invention aims to solve: Therefore, parts such as gears and blades must be prepared, and splines and keyways must be machined to attach gears and blades to the rotating shaft. . For this reason, the number of parts increases, the number of processing steps increases, and the number of assembly steps also increases, leading to higher production costs.

Means for solving the problem The clutch case is divided by a partition wall into a front chamber that houses the clutch mechanism and a rear chamber that houses the first transmission mechanism, and the transmission case that houses the second transmission mechanism is separated from the clutch case. Connect to the rear end. A lubricating oil reservoir is provided at the bottom of the rear chamber, one end of the rotating shaft that constitutes a part of the second transmission mechanism extends into the lubricating oil reservoir in the rear chamber, and a lubricating oil droplet is provided at one end of the rotating shaft. Forms the teeth of.

Function: The gear part formed at one end of the rotating shaft lifts up the lubricating oil in the lubricating oil reservoir in the rear chamber to lubricate the first transmission mechanism.

Embodiment An embodiment of this invention will be described based on the drawings. First, a clutch case 1 is connected to the rear of a tractor engine (not shown), a transmission case 2 is connected to the rear end of the clutch case 1, and an axle case is connected to the rear end of the transmission case 2. 3 are connected. Said clutch case 1
is partitioned into a front chamber 5 and a rear chamber 6 by a partition wall 4, and a clutch mechanism (not shown) is housed in the front chamber 5. A cylindrical input shaft 7 has one end connected to the engine via this clutch mechanism.
is provided, and the other end of this input shaft 7 extends into the rear chamber 6. Further, a PTO input shaft 8 whose one end is directly connected to the engine is provided inside the input shaft 7, and the other end of this PTO input shaft 8 extends into the transmission case 2.

Here, a plurality of gears 9, 10, 11, 12 having different numbers of teeth are fixed to the input shaft 7.
Further, a shaft 13 is rotatably supported in the rear chamber 6 with an axis parallel to the input shaft 7,
Loose fit gears 14, 15, 16, and 17 that are always in mesh with the gears 9 to 12 are fitted onto this shaft 13, and a synchromesh that selectively connects these loose fit gears 14 to 17 and the shaft 13 is fitted onto the shaft 13. Tsushiyu mechanism 18,1
9 is provided. And these input shafts 7
A first transmission mechanism 20 is constituted by the shaft 13, the gears 9 to 12, the loosely fitted gears 14 to 17, and the synchromesh mechanisms 18 and 19.

The above-mentioned portion extending into the mission case 2
An intermediate shaft 21 is rotatably fitted onto the PTO input shaft 8, and a plurality of gears 2 are mounted on the intermediate shaft 21.
2, 23, and 24 are fixed. Further, inside the mission case 2, a rear end side of the shaft 13 extends, and a shaft 25, which is a rotating shaft, is rotatably supported. Note that the intermediate shaft 21 and the shaft 13,
25 are arranged with axes parallel to each other, and loosely fitted gears 26 and 27 that are always engaged with the gears 23 and 24 are fitted onto the shaft 13, and these loosely fitted gears 26 and 27 are also fitted on the shaft 13. A constant mesh mechanism 28 is provided to selectively connect the shaft 13 to the shaft 13. Further, the gears 22 and 24 are attached to the shaft 25.
Loosely fitted gears 29 and 30 that are always engaged with are fitted externally,
Furthermore, these loosely fitted gears 29 and 30 are connected to the shaft 2.
A constant mesh mechanism 31 is provided which selectively connects to the mesh 5. The intermediate shaft 21, the gears 22 to 24, the shafts 13, 25, the loosely fitted gears 26, 27, 29, 30, and the constant mesh mechanisms 28, 31 constitute a second transmission mechanism 32.

A shaft 33 and a PTO shaft 34 are pivotally supported in the axle case 3 concentrically with the PTO input shaft 8,
The PTO input shaft 8 and the shaft 33 are connected through a cylindrical joint 35, and the shaft 33 and the PTO shaft 34 are connected through a clutch 36. Furthermore, on the outer periphery of the joint 35, there are a large-diameter tooth portion 37 and a small-diameter tooth portion 38.
A gear 39 is rotatably fitted on the outside. Next, a shaft 40 and a drive shaft 41 are rotatably supported in the axle case 3 coaxially with the shaft 25, and these shafts 40 and drive shaft 41 are connected by a joint 42. A gear 43 is slidably splined to the end of the shaft 40 on the transmission case 2 side.
has a tooth portion 44 that selectively meshes with the tooth portion 38.
and a tooth portion 46 that selectively engages with a tooth portion 45 formed at the end of the shaft 25 on the axle case 3 side. Note that the tooth portion 37 is always engaged with the tooth portion 45.

Here, lubricating oil reservoirs 47, 48, and 49 are formed at the bottom of the rear chamber 6, the transmission case 2, and the axle case 3, respectively, and these lubricating oil reservoirs 47 to 49 Lubricating oil is stored inside. The shafts 25, 40
The drive shaft 41 is disposed so as to be immersed in lubricating oil, and the end of the shaft 25 on the clutch case 1 side extends into the rear chamber 6 and is immersed in the lubricating oil. At the end of the shaft 25 extending into the rear chamber 6, a toothed portion 5 having the same module as the toothed portion 45 is provided.
0 is formed.

In such a configuration, the power from the engine is first transmitted to the input shaft 7, and then the gears 9 to 12 and the loosely fitted gear 1 meshing with these gears 9 to 12.
4 to 17 rotate. Then, the synchronized mesh mechanisms 18 and 19 select one of the loosely fitted gears 14 to 14.
17 is connected to the shaft 13, so that the shaft 13 rotates. Next, by operating the constant mesh mechanism 28, the rotation of the shaft 13 is controlled by the loosely fitted gear 2.
6, 27 and the intermediate shaft 21 via gears 23, 24.
is transmitted to. Then, the loose fit gears 29 and 30 that mesh with the gears 22 and 24 rotate, and the shaft 25 rotates by operating the constant mesh mechanism 31. Note that when the shaft 25 rotates, the gear 39 rotates due to the meshing of the tooth portions 45 and 37.

Here, by sliding the gear 43 and meshing the teeth 46 with the teeth 45, the shaft 25 and the shaft 4 are connected.
0 rotates integrally at the same rotation speed, resulting in a normal gear shift state. On the other hand, when the gear 43 is slid in the opposite direction and the tooth portion 44 meshes with the tooth portion 38,
The rotation of the shaft 25 is transmitted to the shaft 40 via the gears 39 and 43, and the rotation speed of the shaft 40 is significantly reduced, resulting in a creep speed.

Next, the second transmission mechanism 32 is lubricated by the lubricating oil in the lubricating reservoir 48 being splashed up by the loosely fitted gears 29 and 30 that rotate together with the shaft 25. On the other hand, the first transmission mechanism 20 is lubricated by the lubricating oil in the lubricating oil reservoir 47 being thrown up by the teeth 50 formed on the shaft 25 when the shaft 25 rotates. Therefore,
A first transmission mechanism 20 located above the rear chamber 6
lubrication can be performed without using a new lubricating oil splashing member, and production costs can be reduced by reducing the number of parts and assembly steps. Further, the formation of the tooth portion 50 is similar to that of the tooth portion 4 for the creep mechanism.
5 can be carried out in the same process as forming the tooth portion 50. Therefore, a new processing step for forming the tooth portion 50 is not required, and production costs can be reduced by reducing the number of processing steps.

Effects of the invention Since this invention is configured as described above, the first transmission mechanism provided in the clutch case can be lubricated without providing a new lubricant splashing member, and therefore the parts Production costs can be reduced by reducing the number of points and assembly steps.Furthermore, if the teeth of the rotating shaft are formed in the same process as the teeth for the creep mechanism, the number of processing steps can be reduced. This has effects such as being able to reduce production costs.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view, and FIG. 2 is a front view. 1... Clutch case, 2... Mission case, 4... Partition wall, 5... Front chamber, 6... Rear chamber, 20
...First transmission mechanism, 25 ... Axis (rotating shaft), 3
2...Second transmission mechanism, 47...Lubricating oil reservoir,
50...Tooth part.

Claims (1)

[Scope of utility model registration request] A clutch case that is partitioned by a partition wall into a front chamber that houses a clutch mechanism and a rear chamber that houses a first transmission mechanism; and a transmission case that is connected to the rear end of the clutch case and that houses a second transmission mechanism. A lubricating oil reservoir is provided at the bottom of the rear chamber, and one end of the rotating shaft that constitutes a part of the second transmission mechanism and having teeth formed at the end is connected to the lubricating oil reservoir in the rear chamber. 1. A lubricating device for a transmission part of a tractor, characterized in that a lubricating oil splashing tooth portion is formed by machining on the outer periphery of one end of the rotating shaft, and is made of the same module as the tooth portion.