JPH0613925U - Lubrication structure of transmission in work vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the amount of lubricating oil injected into the transmission to reduce costs and reduce the weight of the aircraft, and to reduce power loss as much as possible. [Structure] Transmission case 6 long in the front-rear direction
Partition into the front and rear rooms through the partition wall 20,
The oil level of the lubricating oil is set for each of the partitioned rooms.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating structure for a transmission of a work vehicle such as a tractor.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, this type of work vehicle is equipped with a transmission case that incorporates various gear transmissions, and the transmission case is lubricated to prevent wear, corrosion, and overheating of the gear transmissions. Oil is infused. However, in the case where the transmission case is formed long in the front-rear direction, there is a risk that insufficient lubrication may occur in the gears located at high positions due to the flow of lubricating oil due to the forward-backward tilt of the aircraft. , The oil level of the lubricating oil must be set higher than that of the gear arranged at the highest position as a reference, and as a result, the amount of lubricating oil injected becomes large and the weight of the machine is reduced. It was not forgiven that it caused ups and costs, and there was also the inconvenience that the gears located at low positions constantly rotate in oil, causing power loss, which was a problem.

[0003]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a lubrication structure for a transmission in a work vehicle that can eliminate these drawbacks in view of the above-mentioned circumstances, and it is formed to be long in the front and rear. In a work vehicle in which lubricating oil is injected into a transmission case, the transmission case is partitioned into multiple rooms lined up in the front-rear direction, and the oil level of the lubricating oil is set for each room. It is characterized by shitako. With this configuration, the present invention reduces the amount of lubricating oil to be injected to reduce the cost and weight of the aircraft, and to reduce the power loss as much as possible. .

[0004]

Embodiment Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, to the rear portion of the traveling machine body 1, a rotary cultivating working unit 3 is vertically movably connected via an elevating link mechanism 2, and the working unit The unit 3 moves up and down based on the vertical swing of the lift arm 5 associated with the expansion and contraction of the lift cylinder 4, and the basic configuration of these units is the same as in the related art.

Reference numeral 6 denotes a transmission case. The transmission case 6 is formed to be long in the front-rear direction and arranged at the bottom of the traveling machine body 1. The transmission case 6 has an engine 7 The clutch mechanism 8 for connecting and disconnecting the power input from the drive shaft, the drive shaft 9 for distributing the power via the clutch mechanism 8 to the traveling system and the working system, and the power transmission path extending from the drive shaft 9 to the pinion shaft 10 The main variable speed mechanism 11 and the auxiliary speed change mechanism 12, the differential mechanism 14 for transmitting the power input from the pinion shaft 10 to the left and right rear wheels 13 in a distributed manner, and the power transmission path from the drive shaft 9 to the PTO shaft 15 A gear transmission mechanism including an intervening PTO speed change mechanism 16 and the like is installed, and lubricating oil that is also used as hydraulic oil for a hydraulic mechanism, which will be described later, is injected. ing.

By the way, the transmission case 6 includes a front case 17 having a clutch mechanism 8 therein, a center case 18 having a main transmission mechanism 11 therein, an auxiliary transmission mechanism 12, a differential mechanism 14 and a PTO transmission mechanism 16. It is formed by integrally assembling with a rear case 19 which internally houses the sub-speed change mechanism 12, the differential mechanism 14, and the PTO speed change mechanism 16 which are installed in the rear case 19. It is arranged at a position higher than that of the main transmission mechanism 11.

Further, 20 is a partition wall provided between the center case 18 and the rear case 19, and the partition wall 20 is formed by utilizing a front side wall portion 19 a of the rear case 19. That is, the airtight partition wall 20 is formed by sealing the gap of the front side wall portion 19a (gap of the bearing, etc.) with a sealing material (not shown), and the center case 18 side partitioned by the partition wall 20 is formed. In the above, the oil level of the lubricating oil is set low corresponding to the position of the main transmission mechanism 11 to be installed, while on the rear case 19 side, the sub transmission mechanism 12, the differential mechanism 14 and the PTO which are installed are installed. The oil level is set high corresponding to the position of the speed change mechanism 16.

Further, 21 and 22 are hydraulic pumps arranged laterally of the engine 7, and the hydraulic pumps 21, 22 suck the lubricating oil in the center case 18 through a filter 23, The sucked lubricating oil is supplied to the power steering mechanism 24 and the lift cylinder 4, respectively. The surplus oil of the power steering mechanism 24 is returned to the center case 18, while the surplus oil of the lift cylinder 4 is fed to the rear case 19. It is being returned.

Furthermore, 19b is a communication hole formed in the upper end portion of the partition wall 20. The communication hole 19b is formed to allow the lubricating oil overflowed on the rear case 19 side to flow into the center case 18 side. Therefore, it is possible to maintain the oil level height of both cases 18 and 19 at the set height without deviation.

In the embodiment of the present invention configured as described above, the lubricating oil injected into the transmission case 6 lubricates various gear transmission mechanisms to prevent wear, corrosion, overheating, etc. Although it will be used as hydraulic oil for the mechanism 24 and the lift cylinder 4, since the partition wall 20 is provided between the center case 18 and the rear case 19, the flow of lubricating oil due to the forward and backward inclination of the machine body is prevented. The problem that the lubrication is suppressed as small as possible and the lubrication is partially insufficient can be solved.

As described above, according to the present invention, although the transmission case 6 is formed to be long in the front-rear direction, it is necessary to set the oil level of the lubricating oil to be extremely high in consideration of the flow of the lubricating oil. Therefore, it is possible to set the optimum oil level height for each case 18 and 19 corresponding to the gear position to be installed. Therefore, the amount of lubricating oil injected can be significantly reduced to reduce cost and reduce the weight of the machine, and the number of gears that constantly rotate in oil can be reduced to reduce power loss as much as possible. Can be made.

Further, in the embodiment, since the partition wall 20 is formed by using the front side wall portion 19a of the rear case 19, it is convenient that the partition wall 20 can be implemented very easily by changing the degree of adding the sealing material.

Further, in the embodiment, since the communication hole 19b is provided in the upper end portion of the partition wall 20 and the lubricating oil overflowed on the rear case 19 side is made to flow into the center case 18 side, the cases 18 and 19 are The oil level can be maintained at the set level without deviation, and as a result, insufficient lubrication in the transmission case 6 can be reliably eliminated.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and is not limited to the partition wall 20 in which the communication hole 19b is formed, as in the second embodiment shown in FIG. 4, for example. The center case 18 and the rear case 19 may be airtightly separated from each other. That is, in the second embodiment, the lubricating oil circulation paths of the center case 18 and the rear case 19 are separated into two independent systems, respectively, so that both cases 18 and 19 can be airtightly partitioned. ing. In addition, in the first and second embodiments, there is a two-system circulation path for returning excess oil to the center case 18 and the rear case 19, but the present invention is not limited to either case (first embodiment). In the case of the above, it is reduced to the rear case 19. In addition, in the case of the second embodiment, it is needless to say that it is possible to reduce the excess oil to the lubricating oil circulation path only in one case.

[0015]

[Operation effect]

 In short, since the present invention is configured as described above, the inside of the transmission case is divided into a plurality of rooms arranged in the front-rear direction, even though the transmission case is formed long in the front-rear direction. Therefore, the flow of the lubricating oil due to the forward and backward inclination of the aircraft can be suppressed as small as possible. In other words, it is possible to set the optimum oil level for each room without setting the oil level of the lubricating oil in consideration of the flow of the lubricating oil. Although it is possible to reduce the cost and reduce the weight of the aircraft by reducing the number of gears, the number of gears that constantly rotate in oil can be reduced to reduce the power loss as much as possible.

[Brief description of drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a cross-sectional view of a transmission case.

FIG. 3 is a schematic sectional view of a transmission case showing a circulation path of lubricating oil.

FIG. 4 is a schematic sectional view of a transmission case showing a second embodiment.

FIG. 5 is a schematic sectional view of a transmission case showing a conventional example.

[Explanation of symbols]

 1 Traveling Aircraft 4 Lift Cylinder 6 Transmission Case 17 Front Case 18 Center Case 19 Rear Case 19b Communication Hole 20 Partition Wall 21 Hydraulic Pump 22 Hydraulic Pump 24 Power Steering Mechanism

Claims (1)

[Scope of utility model registration request] 1. A running vehicle for work in which lubricating oil is injected into a transmission case formed long in the front-rear direction, wherein the transmission case is partitioned into a plurality of rooms arranged in the front-rear direction, and Lubrication structure for transmissions in work vehicles characterized by setting the oil level of lubricating oil.