JPS6113800Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a planetary gear type reduction/reversing machine.

In this type of speed reduction/reversing machine, it is convenient for disassembly and reassembly to make the transmission shaft and the gears attached to the transmission shaft integral and extractable from the case. However, in a planetary gear type reduction/reversing machine, the sun gear fixed to the case covers the bearing part of the transmission shaft, so with the conventional structure, it is impossible to extract the transmission shaft that is integrated with the bearing. . The present invention aims to provide a structure in such a planetary gear reduction/reversing machine that allows the planetary gear mechanism to be extracted as a whole without being obstructed by the sun gear.

Below, the configuration of the present invention will be explained based on the drawings showing an embodiment. It is a case, and a rear lid 2 is attached to its rear opening 2, and an integrated front lid 3 that covers each shaft support hole is attached to its front side. A mounting flange 4 is integrally connected to the front cover 3, and is mounted to a flywheel housing 5 on the engine side by means of the mounting flange 4.

In the reversing machine case 1 as described above, an input shaft 6 in the front-rear direction is mounted in the upper part of the case 1 . A cylindrical clutch housing 7 is attached to the input shaft 6 on its front side, and a forward pinion 8 is loosely fitted on its rear side. A boss 9 of the clutch housing 7 projects forward from the case 1 and is connected to a flywheel 11 of the engine via a shaft coupling 10. On the other hand, the boss 12 of the forward pinion 8 protrudes into the clutch housing 7, and on the inner periphery of the clutch housing 7 and the outer periphery of the forward pinion boss 12,
Friction plates 18 are attached alternately. 19
is a hydraulic piston arranged inside these friction plates 18, and by supplying hydraulic pressure to the back surface of the hydraulic piston 19, the friction plates 18 are pressed against each other, and power is transmitted.

Next, 20 is a thrust shaft mounted below the input shaft 6, and a flange 21 is formed in the case 1 on this thrust shaft 20, and a large gear is mounted on the rear side of this flange 21. 22 is loosely fitted, and the large gear 22 is always in mesh with the forward small gear 8.
23 is a ring gear fixed to the front side of this large gear 22, and the internal toothed portion 2 of this ring gear 23
4 protrudes forward from the flange 21. A stepped bolt 25 projecting forward is attached to the front side of the flange 21, and a disk-shaped shaft support plate 26 is attached to the front end of the stepped bolt 25. 2
Reference numeral 7 denotes a support shaft that is supported between the shaft support plate 26 and the flange 21, and a small-diameter planetary gear 28 is loosely supported by this support shaft 27, and the planetary gear 28 is connected to a ring gear. It is constantly meshed with the internal teeth 24 of 23.

29 is a sun gear boss having a large inner diameter on the front side and a small diameter on the rear side, and is bolted to the front side wall 31 of the reversing machine case 1 with a flange 30 formed on the outer periphery. A sun gear body 33 externally fitted onto the thrust shaft 20 with a slight gap is press-fitted into the small diameter portion 32, and the sun gear body 33 is always meshed with the planetary gear 28.

Next, to explain the shaft support method of the thrust shaft 20, on the rear side of the thrust shaft 20, the rear part of the large gear 22 receives a thrust load in both the front and rear directions and a load in the radial direction. 2
A series of conical roller bearings 34, 34 are fitted externally, and the rear cover 2 of both of these conical roller bearings 34, 34 is fitted internally into the shaft support cylinder 35 fixed to the outer surface of the rear cover 2.
It is pivoted. 36 is a bearing cover attached to the outer end of this shaft support cylinder 35, and 37 is a propeller shaft joint attached to the rear end of the thrust shaft protruding from this bearing cover 36 and connected to the propeller shaft. In addition, 38 is an outer ring of the conical roller bearing 34, 39 is a roller, and 40 is an inner ring.

On the other hand, on the front side of the thrust shaft 20, the front end of the thrust shaft 20 is formed with a small diameter through a stepped portion 41,
A cylindrical roller bearing 46 consisting of an inner ring 43, an outer ring 44, and rollers 45 and receiving a load only in the radial direction is fitted onto this small diameter end 42, and the outer ring 4
4 is fitted into the large diameter portion 47 of the sun gear boss 29 that supports the sun gear 33, and thereby the thrust shaft 20
The front end of the case 1 is connected to the case 1 through the sun gear boss 29.
It has a structure that is supported by the front side wall. 48 is
This is a clip to prevent the inner ring 43 from coming off, which is fitted onto the small end 42.

49 is the case front side wall 3 corresponding to the thrust shaft 20
The spacer is installed by fitting into the support hole 50 of No. 1, and the projection 51 provided at the center is inserted into the end of the thrust shaft 20. The lubricating oil from the front side wall 31 of the case is transferred from the oil passage of the spacer 50 to the thrust shaft 20. The oil is supplied to the 22 shafts of the large gear via the oil passage inside.

In the above, to remove the planetary gear mechanism,
The bolts 52 that attach the rear cover 2 are removed, and the rear cover 2, thrust shaft 20, large gear 22, ring gear 23, and planetary gear 28 are pulled out as a unit. In this case, only the inner ring 43 of the cylindrical roller bearing 46 is connected to the roller 4.
Since this inner ring 43 has a smaller diameter than the inner diameter of the sun gear 33, it can be easily pulled out without being hindered by the sun gear 33.

That is, in the past, conical roller bearings have been used to receive loads in the radial and thrust directions. However, the conical roller bearing 34
As shown in the figure, since the roller 39 is fitted to the inner ring 40, it is impossible to pull out only the inner ring 40, and it is necessary to pull out at least the inner ring 40 and the roller 39 as one unit.

Therefore, if the conical roller bearing 34 is used in the portion covered by the sun gear 33 as described above, the roller 3
9 is obstructed by the sun gear 33 and cannot be pulled out. One possible solution to this problem is to split the case horizontally and remove it downwards, but doing so has the disadvantage of making the structure complicated and large. The present invention uses a cylindrical roller bearing 46 in which only the inner ring can be pulled out in the part covered by the sun gear, and in addition, in response to longitudinal thrust loads, the side without the sun gear 33, That is, by using two conical roller bearings 34, 34 with mutually different inclinations on the rear side of the thrust shaft 20, the above problem can be solved and the thrust shaft 20 can be pulled out in the horizontal direction. be. Note that if the small diameter end of the thrust shaft 20 is made small in diameter so that it can be pulled out to the roller portion, a conical roller bearing can also be pulled out, but this is not possible because the shaft diameter becomes small and the strength against load becomes a problem.

In addition, 53 is an input shaft 6 protruding from the rear lid 2.
This is an oil passage case that fits into the rear end and is fixed to the rear lid 2, and the oil passage in the input shaft 6 is passed from the oil passage in the oil passage case 53 to the oil passage for clutch operation and lubrication. Oil is sent there, and when the planetary gear mechanism is removed, this is also pulled out together. Figure 2 shows the planetary gear system pulled out as one piece.

As described above, according to the present invention, it is possible to pull out the planetary gear mechanism as a whole without being obstructed by the sun gear, which has the effect of facilitating assembly and disassembly.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a speed reduction/reversing machine according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a planetary gear mechanism pulled out as a whole. 1... Reduction/reversing gear case, 2... Rear lid (case lid), 20... Thrust shaft, 23... Ring gear,
28... Planet gear, 33... Sun gear, 34...
Conical roller bearing, 46...Cylindrical roller bearing.

Claims (1)

[Scope of utility model registration request] The reduction/reversing gear case is vertically split and a case lid is attached, a horizontal transmission shaft is mounted between the bearings of the case and the case lid, and a planetary gear mechanism such as a ring gear or planetary gear is attached to this transmission shaft. On the other hand, in a marine reduction and reversal machine in which a sun gear fixed to the case is fitted onto a transmission shaft and this sun gear is meshed with a planetary gear, one of the bearing parts that support the transmission shaft is inclined to each other. The other is pivotally supported to the case lid by two sets of conical roller bearings with different diameters, and the other is pivotally supported to the reversing machine case using a cylindrical roller bearing from which only the inner ring can be pulled out, and the outer diameter of this inner ring is A bearing device for a planetary gear type marine reduction/reversal machine that is smaller than the inner diameter of the sun gear boss.