JPS6225564Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sun gear fixing structure in a planetary gear device (combining a planetary gear mechanism and an output shaft) suitable for a marine reduction/reversing gear and the like.

Conventionally, in this type of device, the sun gear of the planetary gear mechanism is fixed by fitting into the annular step on the inner surface of the case in a spigot type, but the length of the spigot fitting part (fitting depth) Since this is short, the accuracy of assembling the sun gear is low, and there is a problem that the concentricity and parallelism of various parts of the planetary gear mechanism are likely to be out of order. Another problem is that it is difficult to remove the bearing for supporting the output shaft. Moreover, since the sun gear is fixed to the inner surface of the case, there is a problem in that it is difficult to attach or remove the sun gear.

In order to solve the above-mentioned conventional problems, this invention
A large diameter extension is provided at one end of the sun gear, the extension is tightly fitted into the hole in the case, and the outward flange provided at the tip of the extension is fixed to the outer surface of the case, and the sun gear is pulled out from the flange. A bolt hole is provided for the output shaft, and a bearing for supporting the output shaft is attached to the inner circumferential surface of the large diameter extension. Furthermore, in the present invention, the bearing is fitted to the output shaft in a removable state to the outside of the case, and the inner surface of the annular step formed between the large-diameter extension portion and the sun gear body on the bearing side is It has a structure in which the end faces of the inner race and outer race of the bearing face each other.

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

The drawing is a schematic vertical cross-sectional view when the present invention is applied to a marine reduction/reversing gear.
A horizontal input shaft 2 is arranged at the top of the screen. The input shaft 2 is supported in holes in both end walls 3 and 4 of the case 1 via bearings 5 and 6, respectively, and the end of the input shaft 2 protruding from the bearing 5 to the outside of the case 1 is supported via a damper disk 7. It is connected to the flywheel 8 of the engine. A boss 10 is firmly fitted and fixed to a portion of the input shaft 2 near the bearing 6, and an outer peripheral drum 12 of a multi-disc clutch 11 projects integrally from the outer peripheral portion of the boss 10 toward the flywheel 8 side. The multi-plate clutch 11 is conventionally known and includes a plurality of friction plates 15 between an outer drum 12 and an inner drum 13.
and plates 16 are arranged alternately, and when the piston 17 is moved to the pressure plate 18 side by hydraulic pressure and the friction plate 15 and plate 16 are brought into pressure contact, the outer drum 12 and the inner drum 13 rotate together, In other words, the clutch is in a connected state. 19 is a return spring (compression coil spring) for the piston 17. A pinion 20 (a small diameter helical gear) is rotatably fitted to the input shaft 2 between the clutch 11 and the bearing 5 via a bushing, and the inner drum 13 is integrally connected to the pinion 20. It is formed.

A large gear 21 (large diameter helical gear) meshes with the small gear 20 from below. The boss 22 of the large gear 21 is coaxially supported by the output shaft 25 via a plain bearing 23 (or rolling bearing). Output shaft 25
is parallel to the input shaft 2, and the left end in the figure is supported by the annular step of the case end wall 3 via a bearing 26, and the part near the other end is supported by the hole 43 of the case end wall 4 via a bearing 27. As will be described later, a joint flange 28 is fixed to the right end in the figure that protrudes outside the case 1. 29, 29' are holding plates and bolts for fixing the flange 28, 28'
is a spline for fitting a flange 28, and the flange 28 is connected to a flange on a propeller shaft (not shown).

A cylindrical member 3 that integrally has an internal gear 30 is provided on the right side surface of the large gear 21 in the figure (the side surface on the case end wall 4 side).
1 is fixed by a plurality of bolts 32 (only one is shown). The bolt 32 is parallel to the output shaft 25 and is passed through the bolt insertion hole of the large gear 21 from the case end wall 3 side. The cylindrical member 31 is coaxial with the output shaft 25, and an internal gear 30 is formed in a portion close to the case end wall 4. For example, three planetary gears 33 are meshed with the internal gear 30. .
The planetary gear 33 is connected to the support shaft 3 via a rolling bearing 35.
The left end of the support shaft 36 in the figure is fitted and fixed in a hole in a carrier 37, and the right end in the figure is fitted and fixed in a hole in an annular plate 38. The carrier 37 integrally projects radially outward from the output shaft 25 and is located between the planetary gear 33 and the large gear 21 . The annular plate 38 has a plurality of stepped bolts 39
It is fixed and positioned with respect to the carrier 37 by. Sun gear 40 meshing with planetary gear 33
is concentrically and rotatably fitted to the output shaft 25. The sun gear 40 is integrally provided with a large-diameter extension 44 at the end opposite to the carrier 37, and the extension 44 is connected to a hole 43 formed in the thick wall of the case end wall 4.
It is tightly fitted. The extension part 44 is the hole 4
An outward flange 41 is provided on the part protruding from 3 to the outside.
A flange 41 is fixed to the outer surface of the case end wall 4 by a plurality of bolts 42 together with an annular plate 46 (lid) disposed outside the flange 41. The inner circumferential portion of the plate 46 is fitted into the inner circumferential surface of the flange 41 in a screw-in manner. Flange 41 is bolt 4
The sun gear 40 is provided with a plurality of bolt holes 45 in addition to the hole through which the sun gear 2 is inserted, and by using the bolt holes 45, the sun gear 40 can be easily extracted as described later. The bearing 27 for supporting the output shaft 25 is fitted into the inner periphery of the extension portion 44 . sun gear 40
A stepped inner surface 49 (a surface perpendicular to the center line of the output shaft 25) between the main body (small diameter portion) and the large diameter extension portion 44 faces the end surfaces of the outer race and the inner race of the bearing 27.

Note that a thrust collar 50 is arranged between the boss 22 of the large gear 21 and the carrier 37, and a thrust receiving ring 47 is arranged between the boss 22 and the bearing 26. The ring 47 has an outward flange 48 on its outer peripheral surface, and an annular gap is separated between the flange 48 and the boss 22.

The effect will be explained. With the clutch 11 connected as described above, the rotational force transmitted from the flywheel 8 to the input shaft 2 via the damper disk 7 is transmitted from the boss 10 to the multi-plate clutch 11, and from the clutch 11 to the small gear 20. The rotational force transmitted to the small gear 20 is transmitted to the large gear 21, during which time the direction of rotation is reversed and the first stage of deceleration is performed. When the large gear 21 rotates, the internal gear 30 also rotates, and the planetary gear 33 that meshes with the internal gear 30 rotates around the support shaft 36 and rotates around the output shaft 25.
The planetary gear 33 rotates the output shaft 25 via the support shaft 36 and the carrier 37.

When removing the sun gear 40 and bearing 27, first remove the flange 28 from the output shaft 25, and then remove the bolt 4.
2 and remove the plate 46 from the flange 41. Next, extractor bolts (not shown) are screwed into each of the plurality of bolt holes 45, and these bolts are continued to be turned slightly one after another. Then, the tip of each bolt will push the case end wall 4 roughly evenly, so
The extension portion 44 and the main body of the sun gear 40 are extracted to the outside of the case 1. When removing the above, the stepped inner surface 49
engages with the bearing 27, and the bearing 27 is extracted from the output shaft 25 together with the sun gear 40.

In the illustrated embodiment, the other bearing 26 can also be easily removed. In other words, when the output shaft 25 is removed from the case 1, the ring 47
The bearing 26 can be easily extracted together with the ring 47 by inserting the tip of an extraction tool (not shown) into the gap between the flange 48 and the boss 22 and pulling the flange 48 toward the bearing 26 using the tool.

According to the structure of the present invention described above, the extension part 44 of the sun gear 40 passes through the hole 43 of the case end wall 4 in a tight state, so that the extension part 44 and the case end wall 4 are connected with each other with a ferrule. Therefore, the sun gear 40 can be fixed to the case end wall 4 in a highly accurate position and posture, and the relative assembly of each part of the planetary gear mechanism and the output shaft 25 can be increased. Accuracy can be improved. While fixing the flange 41 to the outer surface of the case end wall 4,
Bolt hole 45 for extracting the sun gear on the flange 41
, the sun gear 40 can be easily removed.

Furthermore, in the present invention, when the sun gear is extracted, the stepped end surface 49 formed between the extension portion 44 and the main body of the sun gear 40 can be engaged with the end surfaces of the inner race and the outer race of the bearing 27, so that the bearing 27 can also be extracted. Therefore, the removal work of the bearing 27 is also easy.

Note that the present invention can also be applied to a planetary gear device in which a multi-plate clutch 11 or the like is not provided.

[Brief explanation of the drawing]

The drawing is a schematic vertical cross-sectional view of an embodiment of the present invention. 1... Case, 25... Output shaft, 27... Bearing, 40... Sun gear, 41... Flange, 42
... Bolt, 43 ... Hole, 44 ... Extension part, 4
5... Bolt hole for extracting the sun gear, 49... Inner surface of the step.

Claims (1)

[Scope of utility model registration request] A planetary gear mechanism is provided around the output shaft placed in the case, a large diameter extension is provided at one end of the sun gear of the planetary gear mechanism, and the extension is tightly fitted into a hole in the case. An outward flange is provided on the part that protrudes from the case, the outward flange is fixed to the case with bolts, a bolt hole is provided in the outward flange for extracting the sun gear, and the output shaft is supported by the inner peripheral surface of the large diameter extension. supports bearings for
The bearing is fitted to the output shaft in a removable state to the outside of the case, and the inner race of the bearing and A sun gear fixing structure for a planetary gear device characterized by facing the end face of an outer race.