JPH0558932B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a tractor case device, and more specifically, the present invention relates to a case device for a tractor. The present invention relates to a case device for a tractor, which includes an oil passage that communicates oil stored in a syringe case.

(B) Prior Art In general, as shown in Fig. 5, a tractor case device consists of a clutch housing 2' located at the front of the machine and a transmission case 5' located at the rear of the machine. The clutch housing and the transmission case are connected to each other by an intermediate case 6' located at the same bottom as the bottom of the clutch housing 2' and the transmission case 6'. It lubricates the stored gear transmissions, etc.

(C) Problems to be Solved by the Invention However, when a tractor equipped with the case device is used for work on a slope, as shown in FIG. S flows to one side through the intermediate case 6', which has a bottom that is substantially the same as the bottom of the clutch housing 2' and the transmission case 5', causing an oil level change and causing an oil level change in either the clutch housing or the transmission case. There is a risk that the stored gear transmission will not be immersed in oil and will not be sufficiently lubricated.

Furthermore, a case device configured to store oil in each of the clutch housing and the transmission case has been proposed, but this device requires installation of a fuel tap in each of the clutch housing and transmission case, which increases costs. As a result, the operator is forced to perform the complicated refueling process twice, and forgets to refuel one case.
This often caused problems with the lubrication of gear transmissions and the like housed in the case. In addition, the case device is not constructed so that the transmission shaft that interlocks the transmission devices housed in the clutch housing and the transmission case, respectively, is immersed in oil, and rust occurs on the transmission shaft. This impedes the lubrication of the contact joint portion, necessitating an increase in the size of the transmission shaft from the viewpoint of strength, and is a factor in increasing costs.

(d) Means for Solving the Problems The present invention aims to solve the above-mentioned problems, and includes housing a clutch and a gear transmission in a clutch housing, housing a variable speed gear transmission in a transmission case, The clutch housing and the transmission case are connected by an intermediate case that houses the transmission shaft, and an oil passage is formed in the intermediate case to communicate the oil in the clutch housing and the transmission case. The oil passage in the case is located above the clutch housing and the bottom of the transmission case.

(e) Effect Based on the above configuration, when the machine body is held approximately horizontally due to flat ground work with a tractor, oil accumulated in the case device is transferred to both the clutch housing and the transmission case through the oil passage in the intermediate case. The oil level is maintained in a substantially horizontal state at a position where the transmission shaft of the intermediate case is immersed. In addition, when the machine body is tilted due to tractor work on slopes, etc., the oil accumulated in the case device is blocked by the clutch housing and the side wall of the transmission case below the oil passage in the intermediate case, and the oil is blocked by the side wall of the clutch housing and transmission case. Each is held in a case.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 and 3, the tractor N has an engine block 1 at the front of the machine body, and a front chassis 15 is fixed to the lower part of the block 1 so as to protrude forward. A clutch housing 2 is fixed to the rear part, and an oil drain plug 2a is installed on the lower surface of the clutch housing 2 to drain oil from a gear transmission case C (see Fig. 1), which is a part of the housing. ing. Further, a transmission case 5 having a refueling plug 5a for refueling on its upper surface is arranged at the rear of the fuselage, and the case 5 and the clutch housing 2 are connected and fixed via an intermediate case 6, and are integrated into one body. It constitutes a structural type fuselage 16. Furthermore, a front wheel 12 is supported on the front chassis 15 via a front axle 10, and a transmission case 5 is also supported on the front chassis 15.
A rear wheel 11 is supported via a rear axle 17. On the other hand, a steering wheel 19 is installed above the clutch housing 2, and a seat 20 is installed above the transmission case 5 to form a driver's seat 21.
Based on the fact that the upper surface 6a of the intermediate case 6 is located on substantially the same plane as the step surface 7, a wide foot space consisting of a flat surface is formed.

Further, as shown in FIGS. 6 and 7, one end of a suction pipe 24 is communicated with the lower side of the mission case 5, and the pipe 24 extends downwardly. Oil drain plug 2 at the bottom bottom
4a is arranged. The pipe 24 is connected to an oil pump P placed in front of the engine block 1 via a hydraulic filter F placed below the step surface 7, and the oil in the mission case 5 is sucked in as working oil for the hydraulic system. be done.

As shown in FIG. 1, a main clutch 22 is housed inside the clutch housing 2, and a gear transmission 23 is disposed separated by a case C. The gear transmission 23 is the clutch 2
2 output shaft, that is, a gear 26 fixed to a shaft 25 coaxially extending to the engine crankshaft, and a main transmission shaft 2 that is moved one step downward by the shaft 25.
The main transmission shaft 27 is located below the engine crankshaft by a predetermined amount when the gears 26 and 28 mesh with each other. Further, the main transmission shaft 27 is made of a hollow shaft, and the main hollow transmission shaft 27 is connected to the intermediate case 6.
The intermediate case 6 covers the main hollow transmission shaft 27 and is connected to the clutch housing 2 and the transmission case 5. An oil passage 6b is formed which is located above the bottom of the case and allows the oil accumulated in each case to interact with each other. Further, a front wheel drive transmission shaft 29 is rotatably fitted into the main hollow transmission shaft 27, and thus these transmission shafts 27, 29 constitute a double shaft. Further, the front end portion of the front wheel transmission shaft 29 protrudes from the main hollow transmission shaft 27, and a gear 30 is fixed to the protrusion. Furthermore, a front wheel drive shaft 31 is rotatably supported within the gear transmission 23, and a front wheel drive switching gear 32 is supported on the drive shaft 31 so as to be slidable only.
The front end of the drive shaft 31 projects forward from the lower part of the clutch housing 2. Then, the gear 30 is connected to the switching gear 3 via the intermediate gear 33.
2, and the front wheel drive shaft 3
1 is connected to the front axle 10 via a short propeller shaft 34 (see FIG. 3).
On the other hand, a variable speed gear transmission 34 is disposed in the transmission case 5.
The pinion shaft 3 is coaxially with the front wheel drive transmission shaft 29.
5 is rotatably supported, and the pinion shaft 35
is connected to the front wheel drive transmission shaft 29 at its front end, and its rear end is interlocked with the differential gear 36 of the rear axle 17 via a bevel pinion.
Furthermore, a PTO speed change shaft 37 is rotatably supported above the pinion shaft 35, and a traveling speed change shaft 39 is rotatably supported below the pinion shaft 35. An intermediate gear set 4 is fitted onto the pinion shaft 35 and has a large number of gears having different numbers of teeth.
0 is rotatably arranged, and the gear set 40 is connected to the main hollow transmission shaft 27. Also, PTO
On the transmission shaft 37, a large gear 41 and a small gear 42, which are in constant mesh with the gears of a gear set 40, are rotatably supported, and an intermediate gear 43 is supported so as to be slidable only. Gear 43 is PTO
Based on the operation of the speed change lever, the large gear 41, the small gear 42, or the gear 40b of the gear set 40 can be selectively engaged. Furthermore, the PTO transmission shaft 37 is moved one step downward at its rear end via gears 45 and 46.
It is connected to a PTO shaft 47, and the PTO shaft 47 is located approximately coaxially with the main transmission shaft 27 and the front wheel transmission shaft 29. Further, two selection gear sets 49 and 50 are fitted to the traveling shift shaft 39 so as to freely slide only, and these gear sets 49 and 50 are operated based on the operation of the main shift lever 56 (FIG. 3). , can mesh with a predetermined gear of the intermediate gear set 40. In addition, the transmission shaft 3
At the rear portion of 9, an auxiliary transmission gear set 52 is rotatably supported, and an ultra-low speed selection gear 53 is supported so as to be slidable only.
An ultra-low speed gear set 55 is disposed connected to the sub-transmission gear set 52, and the selection gear 53 directly meshes with the sub-transmission gear set 52 or meshes with the ultra-low-speed gear set 55 to select the sub-transmission gear set 5.
2, the rotation of the speed change shaft 39 is transmitted directly or via a very low speed gear set. Further, at the rear of the pinion shaft 35, a gear set 57 operated by a sub-shift lever is supported so as to be able to slide only, and the gear set 57 is selectively meshed with any gear of the sub-shift gear set 52. It is possible. In addition, numeral 59 in the figure is a gear for reverse movement. Moreover, 6b is a strength member constructed by extending the left and right side walls of the intermediate case 6 downward.

Furthermore, oil is stored in the clutch housing 2, more specifically, in the case C partitioned within the housing, and in the transmission case 5, which communicates with the oil passage 6b of the intermediate case 6. The transmission shaft 27 housed in the intermediate case 6 in the state,
29 is immersed in oil to form an oil surface S.

Since this embodiment has the above configuration,
When the tractor 1 is used for work on flat ground with the machine body 16 held approximately horizontally, oil flows into the clutch housing 2, specifically the case C, and the transmission case 5 through the oil passage 6b of the intermediate case 6. The oil level S is connected to the intermediate case 6.
The transmission shafts 27, 29 housed in the clutch housing 2 are held in a substantially horizontal state until they are immersed in the oil. Inside the transmission case 5, a pinion shaft 35, which is the second shaft from the top, is immersed in oil. The oil stored in the clutch housing 2 and the transmission case 5 lubricates the gears etc. housed in the respective cases, and the oil stored in the intermediate case 6 lubricates the transmission shafts 27 and 29. However, at this time,
Not only the gears below the oil level S, but also the gears 26 located on the uppermost shafts 25 and 37 above the oil level S,
41, 42, 43, 45 are also the second axes 27, 2
Gears 30, 28, 40, 4 fixed to 9, 35
6 and is thrown up and lubricated.

Additionally, due to tractor 1 working on slopes, etc., the aircraft 1
When performing work with the clutch housing 2 and the transmission case 5 tilted, as shown in FIG. The housing 2 and the case 5 respectively hold the gears and the like housed in the housing 2 and the case 5 to lubricate the gears and the like housed in the respective cases.

Note that when refueling the clutch housing 2 and the transmission case 5, if the oil filler plug 5a installed on the top surface of the transmission case 5 is removed and refueled, the oil filled in the transmission case 5 will flow into the intermediate case 6. The oil flows into the clutch housing 2, and the housing 2 and the case 5 are supplied with oil. Further, when draining the oil from the clutch housing 2, the oil drain plug 2a installed on the lower surface of the housing 2 is removed, and the oil from the housing 2 is drained. Furthermore, when draining oil from the transmission case 5, removing the oil drain plug 24a installed at the bottom of the suction pipe 24 will drain the oil in the case 5, the suction pipe 24, and the hydraulic filter F. The oil draining work can be performed at a position where the work is not obstructed by the rear wheels 11 and the like.

(G) Effects of the Invention As explained above, according to the present invention, the clutch 22 and the gear transmission 23 are housed in the clutch housing 2, and the transmission gear transmission 34 is housed in the transmission case 5, and these The clutch housing 2 and the transmission case 5 are connected to the transmission shaft 2.
7 and 29, and an oil passage 6b is formed in the intermediate case 6 to communicate the oil in the clutch housing 2 and the transmission case 5. 6b is located above the bottom of the clutch housing 2 and transmission case 5, so even if the machine body 16 is tilted due to tractor N working on a slope, the clutch housing 2 and transmission case 5 will be free of oil. The transmission shafts 27 and 29 housed in the intermediate case 6 are immersed in oil when the fuselage 16 is in a horizontal state. the transmission shaft 27,
It is possible to prevent the occurrence of rust and decrease in strength of the transmission shafts 27 and 29, and there is no need to increase the size of the transmission shafts 27 and 29. Further, the clutch housing 2 and the transmission case 5 can be refueled using a single refueling plug 5a, and the housing 2 and the case 5 can be refueled with one refueling.
There is no problem with lubrication due to forgetting to refuel one of the cases. Furthermore, the transmission shaft 2 is attached to the intermediate case 6.
Since the oil passage 6b is formed by covering the clutch housing 2 and the transmission case 5, the amount of oil can be reduced compared to a case in which oil is filled in an intermediate case having a bottom substantially parallel to the bottoms of the clutch housing 2 and the transmission case 5. , gears and the like housed in the housing 2 and the case 5 can be lubricated with a small amount of oil.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a case device according to the present invention, FIG. 2 is an external view thereof, FIG. 3 is a side view showing a tractor to which the present invention is applied, and FIG. 4 is a case showing the operation of the present invention. FIG. 5 is a side view of the device, FIG. 5 is a side view showing the operation of a conventional case device, FIG. 6 is a side view of the case device with a suction pipe attached, and FIG. 7 is a detailed view of the suction pipe. . 2...Clutch housing, 5...Mission case, 6...Intermediate case, 6b...Oil passage, 22
...Clutch (main clutch), 23... Gear transmission, 27, 29... Transmission shaft (27... Main hollow transmission shaft, 29... Front wheel drive transmission shaft), 34... Speed change gear transmission, N ...Tractor, C...Gear transmission case, S...Oil level.

Claims (1)

[Scope of Claims] 1. A tractor having a clutch housing 2 at the front of the body and a transmission case 5 at the rear of the body, in which oil is stored and communicated with the clutch housing and the transmission case. In the N case device, the clutch 22 and the gear transmission 23 are housed in the clutch housing, the transmission gear transmission 34 is housed in the transmission case, and the clutch housing and the transmission case are connected to the transmission shaft 2.
7 and 29, and an oil passage 6b is formed in the intermediate case to communicate the oil in the clutch housing and the transmission case, and the oil passage in the intermediate case is connected to the clutch housing and the transmission case. A tractor case device located above the bottom of the transmission case. 2. The tractor case device according to claim 1, wherein the oil passage of the intermediate case is disposed at a height higher than the second shaft from the top of the speed change gear transmission of the transmission case. 3. The tractor case device according to claim 1, wherein the transmission shaft is a double shaft.