JPS626145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil pan of a speed reducer/reverser used in a marine propulsion device or the like.

Generally, in a marine speed reduction/reversing gear, a gear is installed inside the oil pan, so there is a risk that the gear will stir the oil, causing the oil temperature to rise or air to get mixed in. If the oil becomes hot, sufficient lubrication and cooling effects cannot be obtained, and if a large amount of air is mixed in, it becomes impossible to supply sufficient oil pressure to the hydraulic clutch.
For the above reasons, agitation of the oil must be avoided as much as possible, and for this reason, in conventional products, a buff-full plate is provided inside the oil pan, and the gear is covered by the buff-full plate. However, in that case, the provision of the full plate complicates the structure and increases the cost.

In order to solve the above-mentioned conventional problems, the present invention has the following features:
This is a partition that replaces the conventional buttful plate and is integrated with the outer wall of the oil pan, and is constructed as follows.

That is, the present invention provides a case in which a partition wall is formed integrally with the bottom wall and the pair of side walls inside a case of a speed reduction/reversing machine having a pair of end walls, a pair of side walls, and a bottom wall, and a partition wall is formed on the top of the partition wall. A bearing support portion is formed, an oil chamber is formed between the partition wall and one end wall, a gear chamber is formed between the partition wall and the other end wall, and a gear of the power transmission mechanism is installed in the gear chamber. The shaft is arranged so as to extend generally perpendicular to the partition wall and the end wall.

In the present invention, a pair of gear chamber bottom wall portions extending generally along the outer periphery of the gear are provided near the side walls, and the gear chamber bottom wall portion is integrally formed with the other end wall, partition wall, and bottom wall. An oil passage with a roughly triangular cross section is formed between the bottom wall of each gear chamber and the side wall and bottom wall, and a hole is provided in the partition wall to connect the oil chamber and the oil passage, and the oil passage is connected to the external oil suction passage. It is characterized in that an oil suction port connecting the oil passages is provided on the other end wall.

According to the above configuration, the oil in the oil chamber flows from the hole in the partition wall to the external oil passage through the oil passage and the oil suction port. Further, since the oil chamber and the oil passage are each separated from the gear chamber by a partition wall and a bottom wall portion of the gear chamber, the oil inside them is not agitated by the gear.

Next, embodiments will be described with reference to the drawings.

In FIG. 1, which is a vertical cross-sectional view, an input shaft 3 of a speed reducer and reverser is connected to an engine flywheel 1 via a damper 2. As shown in FIG. The output shaft 4 is located behind the input shaft 3 (to the right in FIG. 1) and below, and extends parallel to the input shaft 3. An input gear 5 is provided at the rear end of the input shaft 3, and an output gear 6 is provided at the front end of the output shaft 4.

In FIG. 2, which is a partially cutaway view of FIG. , 6 are provided with a pair of forward rotation units F, F, and diagonally above the left and right reverse rotation units G, G are provided. In FIG. 1, the normal rotation unit F includes an intermediate gear 7, an output pinion 8, and a hydraulic multi-plate clutch 9 that can connect both 7 and 8, concentrically, the intermediate gear 7 meshes with the input gear 5, and the output pinion 8 It meshes with output gear 6. The pair of right and left normal rotation units F and F in FIG. 2 have the same structure and dimensions. Reversing units G and G also have almost the same structure and dimensions as unit F, except that intermediate gear 7' of unit G does not mesh with input gear 5, but meshes with intermediate gear 7 of unit F. are different.
Therefore, when the clutch 9 of the normal rotation unit F is connected, the rotational force of the input gear 5 is transmitted to the output gear 6 via the intermediate gear 7 of both units F, the clutch 9, and the output pinion 8, and the output shaft 4 is connected to the input shaft 3. Rotate in the same direction. Also, clutch 9' of reversing unit G
When connected, the rotational force of the input gear 5 is transmitted from the intermediate gear 7 of the forward rotation unit F to the output gear 6 via the intermediate gear 7' of the reverse rotation unit G, the clutch 9', and the output pinion 8, and the output shaft 4 is connected to the input shaft. Rotate in the opposite direction to 3.

The case of the speed reduction/reversing machine is formed into three parts: a lower case A, an intermediate case B, and an upper case C, which are fixed to each other by bolts 10 and 11. Divided surfaces (mating surfaces) a- for cases A, B, and C
a, bb are horizontal. The dividing plane a-a of the lower case A and the middle case B is located below the output shaft center O, and only the lower part of the output shaft 4 is located below the dividing plane a-a. The dividing plane bb of the intermediate case B and the upper case C passes through the centers f and f of both normal rotation units F and F, respectively. The lower case A forms an oil pan. The intermediate case B forms the main part of the bearing part when viewed as a whole of the speed reduction/reversing machine, and is used for the input shaft 3 and the support shaft 1 of the reversing unit G.
2 over the entire circumference, and the upper and middle parts of the output shaft 4 and the support shaft 1 of the normal rotation unit F.
It supports the lower half of 3. Horizontally protruding installation feet 15, 15 are integrally provided on both left and right walls of the intermediate case B, and the installation feet 15 are bolted to an engine stand of the hull (not shown). A lid D is bolted to the upper end surface cc of the upper case C. Note that the installation foot 15 can also be provided separately from the case B.

As shown in Fig. 1, the lower case A and the middle case B have a boss 16 at the middle part in the front-rear direction (left-right direction in Fig. 1).
It is equipped with The bosses 16 of both cases A and B are joined to each other and extend in an annular shape, and the small diameter front end of the output shaft 4 is supported by the inner cylindrical surface of the boss 16 via a cylindrical roller bearing 17. The output gear 6 is provided adjacent to and behind the bearing 17 (to the right in FIG. 1), and the intermediate portion of the output shaft 4 adjacent to the output gear 6 is provided with two rows of tapered roller bearings 18 and a generally cylindrical shape. vertical rear walls A1, B of cases A and B via the bearing box 19 of
A joint flange 20 for connecting to a propeller shaft (not shown) is fixed to the rear end of the output shaft supported by B1 and protruding from cases A and B. 2
1 and 22 are collars provided between the inner rings 23 and 23 and between the outer rings 24 and 24 of both bearings 18 and 18;
are the bearing inner ring 23 and the joint flange 2 on the right side in Figure 1.
This is a collar provided between the end surface of the boss cylinder and the end face of the boss cylinder. 2
Reference numeral 6 denotes an annular cover fastened to the rear end of the cylindrical portion 27 of the bearing box 19, and its inner circumferential surface fits into the outer circumferential surface of the collar 25 via a seal 26'. Bearing box 19
The inner circumferential surface of the cylindrical portion 27 is fitted with both bearing outer rings 24, and the outward flange 28 on the outer circumferential surface of the cylindrical portion 27 is connected to cases A and B by a plurality of bolts 29.
It is fixed to the outer surface of the vertical rear wall A1, B1 of.
Further, a portion of the cylindrical portion 27 in front of the flange 28 (on the output gear 6 side) is fitted into a hole 30 formed in the mating surfaces of the cases A and B.

The boss 16 of the case A is formed at the upper edge of a partition wall A3 that integrally extends upward from the case bottom wall A2. As shown in FIG. 3, which is a partial view of FIG. A relatively narrow gear chamber 80 in which the lower part of the output gear 6 is accommodated is formed between the walls A1. A relatively wide oil chamber 81 for storing oil is formed between the partition wall A3 and the front wall A4, and both chambers 80 and 81 are connected through one small diameter hole 82 provided at the lower end of the partition wall A3. communicate with each other.

As shown in FIG. 4, which is an enlarged partial cross-sectional view of FIG. 1, the oil suction port 83 is formed by a hole in the rear wall A1. The rear wall A1 is provided with a cylindrical boss 84 projecting rearward (rightward in FIG. 4) from around the suction port 83, and a joint 85a of the suction pipe 85 is attached to the end surface of the boss 84 with a bolt 85'. The joint 85a includes a suction port 83 and a filter 85b that enters a passage 86, which will be described later. pipe 85
The other end is connected to the oil pump 43 attached to the rear of cases B and C as shown in Figure 1.
Hydraulic oil and lubricating oil are supplied from 3 to the hydraulic clutches 9, 9' and the lubricating section.

As shown in FIG. 5, which is a cross-sectional view of FIG. 3, one suction port 83 is provided on each side of the lower end of the rear wall A1. A passage 86 having a generally triangular cross section that is continuous with the suction port 83 is connected to the bottom wall portions 80a on both sides of the gear chamber 80.
The entrance of the passage 86 is the partition wall A3.
It communicates with the oil chamber 81 through holes 86' provided on both sides of the lower end. The portion 80a has an arc-shaped cross section, and the entire bottom wall and side wall of the gear chamber 80 extend approximately in an arc shape along the outer periphery of the gear 6.

For example, the oil in the oil chamber 81 is accumulated to the extent that the lower part of the bearing 17 shown in FIG.
5 to the oil pump 43 in FIG. During this operation, the oil in the gear chamber 80 is stirred by the gear 6, but because the partition wall A3 is provided, the oil in the oil chamber 81 is not stirred, and therefore high temperature oil and air are mixed into the pipe 85. No oil is sucked in.

As explained above, according to the present invention, case A
The inside of the (oil pan) is divided into a gear chamber 80 and an oil chamber 81 by a partition wall A3 integral with the bottom wall A2 (outer wall), and the gear 6 is inserted into the gear chamber 80, and an oil suction port 83 Since it is connected, it is possible to achieve the same effect of preventing oil agitation as with conventional products that have a separate buttful plate.
Moreover, the number of parts is reduced compared to conventional products, and the partition wall A3
can be formed during case casting, reducing manufacturing costs.

Furthermore, in the present invention, a pair of gear chamber bottom wall portions 80a extending generally along the outer periphery of the gear 6 in the gear chamber 80 are provided near the side wall A5, and the gear chamber bottom wall portion 80a is provided as an end wall (rear wall A1). and partition wall A3 and bottom wall A
2, and each gear chamber bottom wall portion 80
An oil passage 86 having a generally triangular cross section is formed between the side wall A5 and the bottom wall A2.

In this way, in the present invention, since the oil passage 86 is provided near the side wall A5, the bottom wall A2 can be placed close to the gear 6, and the overall height of the device can be set small.

Further, the partition wall A3 acts as a bearing support part and also acts as a reinforcing part for the bottom wall A2 and the side wall A5, so the partition wall A3 is required to have sufficiently high strength.

In the present invention, the lower side parts of the partition wall A3 are
It is connected to the end wall (rear wall A1) by a hollow structure having a triangular cross section, which is made up of the bottom wall A2, part of the side wall A5, and the gear chamber bottom wall portion 80a. Therefore, the strength of the partition wall A3 can be sufficiently increased.

[Brief explanation of the drawing]

Fig. 1 is a vertical longitudinal sectional view of the embodiment, and Fig. 2 is a vertical cross-sectional view of the embodiment.
A partial cutaway view of the figure - Fig. 3 is a partial view of Fig. 1 - as seen from the arrow, Fig. 4 is an enlarged cross-sectional partial view of Fig. 1, and Fig. 5 is a cross-sectional view of Fig. 3. It is. 6... Gear, 80... Gear chamber, 80a... Gear chamber bottom wall portion, 81... Oil chamber, 83... Suction port, 8
6... Oil passage, 86'... Hole, A... Lower case (oil pan), A1... Rear wall (end wall), A2... Bottom wall, A3... Partition wall, A5... Side wall.

Claims (1)

[Claims] 1. A partition is formed integrally with the bottom wall and the pair of side walls inside the case of the speed reduction/reversing machine, which has a pair of end walls, a pair of side walls, and a bottom wall, and a bearing support part is provided on the top of the partition. an oil chamber is formed between the partition wall and one end wall, a gear chamber is formed between the partition wall and the other end wall, and the gear of the power transmission mechanism is connected to the gear chamber so that its shaft is connected to the partition wall. 1 arranged in a state extending generally perpendicular to the end wall and extending generally along the outer periphery of the gear;
A pair of gear chamber bottom wall portions are provided near the side walls, and the gear chamber bottom wall portion is integrally continuous with the other end wall, the partition wall, and the bottom wall, and each gear chamber bottom wall portion, side wall, and bottom wall are connected to each other. An oil passage having a generally triangular cross section is formed between the partition walls, a hole connecting the oil chamber and the oil passage is provided in the partition wall, and an oil suction port connecting the external oil suction passage and the oil passage is provided in the other end wall. The oil pan of the speed reducer/reverser is characterized by: