JPH0642131Y2 - Lubricator for agricultural tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a lubricating device for an agricultural tractor.

(B) Conventional technology Conventionally, in an agricultural tractor in which a front transmission case and a rear transmission case are mounted in an intermediate case, the front transmission case and the rear transmission case are independent, and lubricating oil is injected separately, When it deteriorated, it was drained and replaced with a new one. In addition, the transmission case is composed of a series of transmission cases from the front clutch housing section to the rear traveling transmission section, and the return oil of the hydraulic system is used for lubricating the main clutch in the clutch housing. It is already known from Japanese Laid-Open Publication No. 55-171621.

(C) Problems to be solved by the invention The lubrication device in the known agricultural tractor forgets to lubricate,
Alternatively, user trouble may occur due to forgetting to drain oil, and the front transmission case may generate heat due to its small capacity. To prevent this, the front transmission case must be made large. The transmission case, which consists of a transmission case from the front clutch housing to the rear transmission mission, operates the hydraulic system that also serves as lubricating oil for the entire long transmission case from the front to the rear. Since the oil had to be filled, a large amount of hydraulic oil was required, which was extremely uneconomical.

(D) Means for Solving the Problems In the present invention, a front transmission case and a rear transmission case, which are respectively sealed, are attached to a low intermediate transmission case, and the front transmission case and the rear transmission case are placed in the middle. The upper and lower pipes laid horizontally in the transmission case communicate with each other, and at least the rear transmission case is filled with hydraulic oil, the front transmission case is connected to the return oil passage of the hydraulic device, and the lower and lower pipes of the rear transmission case are connected. The above-mentioned problems have been solved by providing a suction port in the vicinity of the opening of the hydraulic pump P, which communicates with the hydraulic pump P of the hydraulic device.

(E) Action Lubricating oil is injected into the rear transmission case, sucked by a hydraulic pump, and pumped as hydraulic oil to a hydraulic cylinder that raises and lowers the work machine or a power steering cylinder.
The return oil from these hydraulic cylinders flows into the front transmission case and lubricates the gears inside.

In the front transmission case, the return oil drops and collides with the oil surface of the accumulated lubricating oil to cause bubbles, and also due to the rotation of the gears, bubbles occur. When the working oil near the opening of the pipe is sucked in, the working oil in the lower part of the front transmission case, which is not mixed with bubbles, is sucked into the rear mission through the lower pipe, and the working oil containing bubbles is collected. It is possible to prevent the pipe from being inhaled.

In addition, by connecting the upper and lower parts of the front transmission case and the rear transmission case with a pipe and sucking the suction port provided in the front part of the lower part of the rear mission with a pump, the lower part of the front transmission case → A circulation path connecting the pipe → the lower part of the front part of the rear transmission case → its upper part → the upper pipe → the upper part of the front transmission case is formed and the hydraulic oil returned to the front transmission case is smoothly transferred to the rear transmission case. It is possible to recirculate smoothly, which allows a small amount of oil without filling the intermediate transmission case with hydraulic oil, and the front transmission case is small and sealed, but the front transmission case is It is possible to prevent deterioration of the hydraulic oil in the case.

(F) Embodiment An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is an intermediate transmission case in which a transmission shaft 2 is incorporated and an upper surface is a deck A of a control section, which is connected to a front portion thereof. The clutch housing 3 has an engine mounted on the front part thereof and a steering handle provided on the rear part thereof, and a rear mission case 6 is connected to the rear part thereof. The final deceleration case containing the passive gear 11 that meshes with the gears of the axle and differential shaft 7 and the brake is mounted.

Further, the diff device is composed of a gear 17 that meshes with the pinion 15 of the diff pinion shaft 14 and rotates integrally with the diff case, a differential gear, and the like, and a front transmission chamber 20 and a rear transmission chamber 21 are provided in front of and behind the diff device. The transmission chamber 20 includes a forward / reverse speed change mechanism 22, a traveling auxiliary speed change mechanism 23, and a front wheel power takeoff mechanism 28 for driving the front wheels.
The rear transmission chamber 21 has a PTO speed change mechanism 27 and a traveling main speed change mechanism 28 installed therein.

Further, the power of the engine is transmitted through the desk 2 of the main clutch 31 attached to the flywheel 30, the shaft 33, the gears 35 and 36 in the front transmission case 34, the transmission shaft 2 and the spline joint 37 to the rear mission case 6. Is transmitted to the input shaft 38 of.

The PTO speed change mechanism 27 is supported by the drive gear 41 fitted to the rear end of the input shaft 38 and the rear wall of the rear mission case 6 via bearings.
0, the sleeve 42 spline-fitted to the outer periphery of the hub 42a spline-fixed to the PTO shaft 40, the retainers 43a, the gears 43, 44 loosely fitted via the needle bearing 43b, the sleeve 45 spline-fitted to the hub, and Loose fit gear 46
, A counter shaft 52 supported on the upper portion thereof, a gear 47 meshed with the drive gear 41, a gear 48 meshed with the gear 43 integrally with the drive gear 41, a gear 50 meshed with the gear 44, and the gear.
Gears 51 meshing with each other are spline-fitted.

The traveling speed change shaft is composed of the auxiliary speed change shaft 53, the main speed change shaft 55, and the spline joint 54 connecting them, and
From the upper part of 21 to the upper part of the front transmission chamber 20 via the upper part of the differential device, the traveling main transmission mechanism 28 includes the main transmission shaft 55 supported above the counter shaft 52 and the main transmission shaft 55.
A gear 56 that is loosely fitted to the gear 47, a sleeve 57 that is spline-fitted to the hub, gears 58 and 59 that are loosely fitted to the main transmission shaft 55 and meshed to the gears 48 and 50, and a spline to the hub. It is composed of a fitted sleeve 60 and a gear 61 which is loosely fitted to the main transmission shaft 55 and meshes with the gear 51.
The counter shaft 52 of the speed change mechanism 27 distributes power to the main speed change shaft 55.

The traveling auxiliary transmission mechanism 23 in the front transmission chamber 20 includes an integral gear 62, 63 and a forward drive gear 69 loosely fitted to the auxiliary transmission shaft 53, a gear 64 loosely fitted to the differential pinion shaft 14, and a spline fitting. The transmission gears 65 and 66 and the reduction gear 67 that is loosely fitted to the input shaft 38.

Furthermore, the forward / reverse speed change mechanism 22 above the auxiliary speed change shaft 53
A switching clutch including a back gear 68 loosely fitted to the forward gear, a forward drive gear 69 integral with the gears 62 and 63, and a sleeve interposed between the forward drive gear 69 and the back gear 68 and spline-fitted to a hub. 70, and a gear 73 which is loosely fitted to the counter shaft 71 and meshes with the back gear 68 and the forward drive gear 69 via the counter gear 72.

The front wheel power take-off mechanism 26 includes a gear 74 spline-fitted to the diff pinion shaft 14 and an input shaft 38 engaged with the gear 74.
The speed increasing gear 75 is loosely fitted to the power take-off shaft 75, and the intermittent gear 77 is spline-fitted to the power take-off shaft 76.

Furthermore, on the upper part of the rear mission case 6, there is mounted a cockpit whose front end is substantially aligned with the front end of the rear mission case 6 and whose rear part is located directly above the axle 10.

Thus, the pipe 78 having the transmission shaft 2 installed therein has its front end overlapped with the outer ring of the bearing 79 mounted on the front transmission case 34 and welded around the hole 80, and the rear portion of the rear mission case 6 is welded. Since the pipe 78 is fitted and welded in the hole 81 of the front wall 6a, the front portion of the pipe 78 communicates with the front transmission case 34 through the bearing 78, and the rear portion of the pipe 78 supports the bearing 83 supported by the holder 82. A pipe 85 provided below the pipe 78 communicates with the rear mission case 6 via a hole 86 formed in the lower portion of the rear wall of the front transmission case 34 and a front wall 6a of the rear mission case 6. It is inserted and welded in the bored hole 87.

As shown in the hydraulic circuit of FIG. 3, the hydraulic pump P provided on one side of the engine removes the lubricating oil accumulated in the rear mission case 6 from the suction port 88 provided on the side wall below the bearing 83. The oil is sucked through the suction pipe 88a as hydraulic oil and is sent under pressure through a relief valve 90 and a position control valve 91 to a hydraulic cylinder 89 which is provided on the rear mission case 6 and which raises and lowers a rear working machine. The relief valve 90 is attached to the side surface of the front transmission case 34, and its outflow passage communicates with the inside of the front transmission case 34.When the relief valve 90 operates due to overload, the return oil is returned to the front. It flows into the partial transmission case 34.

Still another hydraulic pump P'removes hydraulic oil from the relief valve 94.
It is pressure-fed to the attached power steering valve 93, and the return oil passage is connected to the suction pipe 88a or the front transmission case 34 as shown by the dotted line. 95 is a filter.

In the tractor described above, the PTO shaft 40 is directly connected to the input shaft 38 when the sleeve 42 is slid forward by the PTO gear shift lever so as to be engaged with the clutch teeth of the drive gear 41, and the sleeve 42 is slid rearward to move the gear 43. The gears 41, 47, 48, 43 shift the gears when engaged with the clutch teeth of the clutch gear, and similarly, the gears are shifted by sliding the sleeve 45 back and forth to engage and disengage the gears 44 or 46. The main speed change mechanism 22 performs the main speed change by sliding the sleeve 57 or 60 back and forth through the link mechanism by the main speed change lever to engage and disengage the gear 56, 58, 59 or 61. When the switching clutch 70 is engaged with the forward drive gear 69 in the forward direction, it moves forward, and when it is engaged with the back gear 68, the gear 73 rotates via the counter gear 72.
Is operated as a counter gear and the forward drive gear 69 is meshed with the transmission gear 66, or the transmission gear 65 is meshed with the gear 63 integrated with the forward drive gear 69.
Is reversely rotated and is shifted.

In addition, the traveling auxiliary transmission mechanism 23 uses the auxiliary transmission lever via the link mechanism, the transmission gear 65, the transmission gear 65, and the reduction gear 67.
Alternatively, the auxiliary shift is performed by engaging and disengaging the gear 63 and engaging and disengaging the transmission gear 66 with the gear 69.

Thus, during the work, the return oil from the steering valve and the return oil of the relief valve 90 provided at the side flow into the front transmission case 34 to lubricate the gears 35, 36, etc. It flows back to the rear mission case 6 through the lower pipe 85.

At that time, the front transmission case 34 is hermetically sealed, and in that state, the lubricating oil in the rear transmission case 6 is sucked out by the pumps P, P ′, but the upper portion of the front transmission case 34 is provided with bearings 79, 83 and Since it communicates with the rear mission case 6 via 78, it freely flows between both cases 34, 6 in conformity with the atmospheric pressure difference, whereby the lubricating oil in the front transmission case 34 flows downward. And smoothly flow back to the rear mission case 6.

(G) Effect of the Invention Since the present invention is configured as described above, the hydraulic pump P sucks lubricating oil as hydraulic oil from the rear mission case 6 and pumps it to a hydraulic cylinder for a working machine or other hydraulic equipment. Some of the working oil from the hydraulic circuit can be removed from the front transmission case 34.
To lubricate the transmission mechanism in the front transmission case 34.

Further, the front transmission case 34 and the rear mission case 6 are connected at their upper and lower parts by pipes, and the rear mission 6 is connected.
By sucking the suction port provided at the front part of the lower part of the vehicle with a pump, the lower part of the front transmission case 34 → the lower pipe → the lower part of the front part of the rear transmission case 6 → the upper part → the upper pipe → the front transmission By forming a circulation path connected to the upper part of the case 34, the hydraulic oil returned to the front transmission case 34 can be smoothly returned to the rear transmission case 6, whereby the hydraulic oil can be returned to the intermediate transmission case. It is possible to reduce the amount of oil and reduce the cost because there is no need to fill the front transmission case 34, and even though the front transmission case 34 is small and sealed, it operates in the front transmission case 34. Oil deterioration can be prevented.

Further, when returning oil flows into the transmission case 34 and bubbles are generated due to the rotation of the gears in the oil, bubbles are generated, but the lower part of the rear transmission case 6 is passed from the lower part of the front transmission case 34 to the lower pipe. By sucking into the pump, it is possible to prevent the foam from being sucked into the pump through the suction port 88 as hydraulic oil.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an exploded vertical sectional view of a transmission case and a clutch housing, FIG. 2 is an exploded perspective view of essential parts, and FIG. 3 is a hydraulic circuit diagram. . 1 ... Intermediate transmission case, 6 ... Rear mission case,
34 …… front transmission case, 78, 85 …… pipe, 79, 83 …… bearing, 88 …… suction port, P …… hydraulic pump

Claims (1)

[Scope of utility model registration request] 1. A low intermediate transmission case (1) is equipped with a front transmission case (34) and a rear transmission case (6) which are respectively sealed, and the front transmission case (34) and the rear transmission case (6) are placed in the intermediate transmission case (1). The upper and lower pipes 78 and 85 are horizontally connected to communicate with each other, at least the rear transmission case 6 is filled with lubricating oil, and the front transmission case 34 is connected to the return oil passage of the hydraulic device. A lubricating device for an agricultural tractor, characterized in that a suction port 88 communicating with the hydraulic pump P of the hydraulic device is provided near the opening of the pipe.