JPH04362350A - Transmission lubricating structure - Google Patents

Abstract

PURPOSE:To cut down lubricating oil quantity while maintaining the uniform elapsed-time change state of lubricating oil quality by providing partition walls for making the oil levels of a clutch case part and a differential case part higher than the oil level of a transmission case part. CONSTITUTION:In the front and rear positions of a transmission case part 8, a front and a rear partition walls 21, 22 for making the oil levels of a clutch case part 7 and a differential case part 9 higher than the oil level of the transmission case 8 are formed integrally with a transmission case M. The front and rear partition walls 21, 22 are respectively provided with discharge openings 23 for determining the oil level of lubricating oil reserved, and throttle openings 24 for the environment of the lubricating oil in the inner lower parts of the front and rear case parts. A lubricating oil suction port 25 is disposed at the rear side lower part of the transmission case part 8, and lubricating oil return parts 26, 26 are disposed at both clutch case part 7 and differential case part 9.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a transmission suitable for a low-floor tractor, and more specifically, the present invention relates to a transmission suitable for a low-floor tractor, and more specifically, a front clutch case part, a rear differential case part, and a transmission case part located before and between them are integrated. A transmission lubrication structure in which the clutch case part and the differential case part are connected to each other to form a transmission case, and the transmission case is configured to have a generally concave shape in side view, with the clutch case part and the differential case part being higher than the transmission case part. Regarding.

0002

[Prior art] This type of mission is
- Like the one shown in Publication No. 25030, the transmission case part located just below the floor of the driver's seat is shaped downward, and the height of the transmission protrusion in the center of the floor is lowered to create a good floor. A technique for obtaining a surface is known.

0003

[Problem to be solved by the invention] Lubricating oil is stored in the lower part of the transmission case, but the oil level in a static state is usually so high that the lower part of the transmission such as gears is submerged. Set accordingly. Therefore,
In the above-mentioned transmission case, which has a generally concave shape when viewed from the side, the oil level of the transmission case as a whole is set to the higher oil level of either the front or rear clutch case or differential case, and the lubricating oil level is set in the transmission case. There were downsides to excess storage, such as increased weight and increased rotational resistance of the transmission. An object of the present invention is to eliminate the above-mentioned negative aspects by making it possible to store a necessary amount of lubricating oil even with the transmission case having the above-mentioned shape.

0004

[Means for Solving the Problems] To achieve the above object, the present invention provides, in the transmission lubrication structure described at the beginning, an oil level in the clutch case part and the differential case part that is lower than the oil level in the front and rear positions of the transmission case part. A bulkhead is formed to raise the oil level in the transmission case, a lubricant suction port is provided in the transmission case, a lubricant return port is provided in both the clutch case and the differential case, and both bulkheads are provided with lubricant return ports in both the clutch case and the differential case. A characteristic feature is that a supply path is provided in each of the clutch case parts and the differential case part to enable the lubricating oil to be discharged to the transmission case part.

[0005]

[Operation] In the characteristic structure described above, oil levels suitable for each of the clutch case section, transmission case section, and differential case section can be set individually by the partition walls provided at the front and rear inside the transmission case. It is now possible to set only the amount of lubricating oil that is required, eliminating the conventional inconveniences such as adding too much oil and the resulting increase in rotational resistance. By the way, it is desirable from the viewpoint of lubrication that the quality of the lubricating oil changes uniformly over time, without prematurely deteriorating just one part of the lubricating oil. When a partition wall is provided in the transmission case as described above, the flow of oil between the separated case chambers tends to deteriorate, resulting in an undesirable state of lubrication. The lubricating oil is supplied from the lower transmission case, such as when the lubricating oil is used as hydraulic oil for the hydraulic system attached to the aircraft, or when the lubricating oil in the transmission case is forcibly circulated by a pump to promote lubrication. The lubricating oil is sucked in and discharged to both the high-level clutch and defuse parts, and both the front and rear bulkheads are provided with supply passages through which the lubricating oil can flow to the transmission case, so that the lubrication of each case is improved. All the oil will circulate evenly, and the quality of the lubricating oil will change uniformly over time.

[0006]

[Effect of the invention] Therefore, by installing a new partition wall with a devised lubricating oil circulation path, it is possible to reduce the amount of lubricating oil while maintaining a uniform change in lubricating oil quality over time, thereby reducing the amount of lubricating oil that has an adverse effect on the lubricating effect. We were able to reduce the amount of lubricating oil in the transmission case, which has a generally concave shape when viewed from the side.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings in the case of a tractor transmission case. As shown in Figure 5, engine E is located at the front of the aircraft,
A control unit 1 is provided in the center, and a mission case M, which transmits the power of the engine E to the rear wheels 2 and the PTO shaft 3, is directly connected to the engine E and is arranged in a front-rear direction while also serving as the fuselage frame. There is. 4 is the steering wheel, 5 is the cockpit, and 6 is the floor.

A mission case M and its internal structure are shown in FIGS. 1 to 4. The transmission case M is constructed by integrally connecting a clutch case part 7 connected to the engine E, a rear differential case part 9, and a transmission case part 8 located between the front and rear thereof, and has the following shape in side view. The clutch case portion 7 and the differential case portion 9 are configured to have a substantially concave shape that is higher than the transmission case portion 8. To explain the internal structure, 10 is a main clutch configured as a wet multi-plate clutch, 11 is a main gear transmission device for the traveling system, 12 is a PTO system gear transmission device, 13 is a PTO system forward/reverse transmission mechanism, and 14 is a A forward/reverse transmission mechanism for the traveling system; 15 is a hydraulic gear shift clutch; 16 is a hydraulic PTO clutch; 17 and 18 are auxiliary gear transmissions and super reduction mechanisms for the traveling system; 19 is a differential mechanism; 20 is a rear It is an axle.

Front and rear partition walls 21 and 22 are integrated with the transmission case M at the front and rear positions of the transmission case section 8 to make the oil level of the clutch case section 7 and the differential case section 9 higher than the oil level of the transmission case section 7. It is formed in As shown in FIGS. 2 and 3, the front and rear partition walls 2
1 and 22 each have a discharge port 23 (corresponding to supply path A) that determines the oil level of the stored lubricating oil, and a throttle port (corresponding to supply path A) for circulating the lubricating oil in the lower part of the front and rear case parts. ) 24 are formed. The aperture 24 in the front partition wall 21 has an upper part that is a bearing part of the main shaft (not shown),
The lower part is the bearing part of the front wheel drive shaft (not shown), and each uses a small amount of oil flowing back and forth from the seal part of the bearing. In addition, a lubricating oil suction port 25 is provided at the rear lower part of the transmission case portion 8, and a lubricating oil return portion 26 is provided in both the clutch case portion 7 and the differential case portion 9.
This is because the lubricating oil is also used as the hydraulic oil for hydraulic devices such as the power steering device and lift arm cylinder (not shown), and the lubricating oil is supplied from the suction port 25 by a hydraulic pump (not shown). The return oil after being sucked in and supplied to the power steering device and lift arm cylinder is returned to the mission case M from the front and rear return sections 26, 26 (the front return section corresponds to the main clutch 10 to which lubricating oil is supplied). It has a structure that allows The amount of oil passing through the throttle port 24 per unit time is set to a very small amount, and while the engine E is started and the hydraulic pump is operating, the oil level in the clutch case portion 7 and the differential case portion 9 is exhausted. The oil level is maintained at the outlet 23.

[0010]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

[Figure 1] Cross-sectional side view of the mission case

[Figure 2] Cross-sectional view of the mission case showing the front bulkhead

[Figure 3] Cross-sectional view of the missionon case showing the rear bulkhead

[Figure 4] Diagram showing the structure of the mission

[Figure 5] Overall side view of the tractor

[Explanation of symbols]

7 Clutch case part 8
Shift case part 9 Differential case part 21, 22 Partition wall 25 Suction port 26 Return part A Supply path

Claims (1)

[Claims] [Claim 1] A transmission case (M) is constructed by integrally connecting a front clutch case part (7), a rear differential case part (9), and a transmission case part (8) located between the front and rear thereof. In addition to configuring this mission case (
M) is a transmission lubrication structure in which the clutch case part (7) and the differential case part (9) are configured to have a generally concave shape in side view and are located at a higher level than the transmission case part (8). There are partition walls at front and rear positions of the transmission case part (8) for making the oil level of the clutch case part (7) and the differential case part (9) higher than the oil level of the transmission case part (8). (21), (22)
A lubricating oil suction port (25) is provided in the transmission case portion (8), and a lubricating oil return portion (26) is provided in both the clutch case portion (7) and the differential case portion (9). ), (26), and both partition walls (2
1) and (22) supply paths (A) and (A) that allow lubricating oil in the clutch case part (7) and the differential case part (9) to be discharged to the transmission case part (8), respectively. ) is the transmission lubrication structure.