JPS6115309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduction gear device for a hoist, and more particularly to the structure of a gear case that houses a reduction gear.

The overall structure of a conventional hoist is as shown in FIG. That is, a driving motor 2 and a reduction gear device 3 are attached to both sides of the main body frame 1, and a wire winding drum 4 is installed between them. Motor 2 is rotated by hoist shaft 5
The signal is transmitted to the reduction gear device 3 via the speed reduction gear device 3, where it is decelerated and transmitted to the drum shaft 6, thereby rotating the drum 4.

Details of the reduction gear device 3 are shown in FIGS. 2 and 3.

This device 3 includes an inner wall 7 located on the winding drum side and an intermediate wall 8 provided outside the inner wall 7.
and an outer wall 9 provided outside of it.
A first outer peripheral wall 10 is provided to surround the space between the outer wall 9 and the intermediate wall 8, and a first outer peripheral wall 10 is provided to surround the space between the intermediate wall 8 and the inner wall 7. A second outer peripheral wall 11 is provided.
The outer wall 9, the intermediate wall 8, and the first outer peripheral wall 10 constitute a first gear case 12, and the intermediate wall 8, the inner wall 7, and the second outer peripheral wall 11 constitute a second gear case 13.

Inside the first gear case 12, a first stage reduction gear set 14, 15 and a second stage reduction gear device 16, 1 are provided.
7 is stored. In addition, the second gear case 1
A third-stage reduction gear set 18, 19 is housed in the inside. The third stage driven gear 19 is located on the inner wall 7
It is fixed to a hollow drum shaft 6 that extends through the winding drum side toward the winding drum.

A hoist shaft (see FIG. 1) that transmits the rotation of the motor passes through the interior of the drum shaft 6 and is connected to a spline shaft joint 22 supported on the intermediate wall 8 via a bearing 21. The rotation of the motor transmitted to this spline shaft joint 22 is transmitted to each of the first, second and third stage reduction gear devices 1.
4 to 19, the signal is reduced in three steps and transmitted to the drum shaft 6, which is the output shaft.

To enable assembly, maintenance, and inspection of each gear set, the first outer peripheral wall 10 is divided along the A-A plane near the outer wall 9, and the second outer peripheral wall 11 is divided along the B-A plane near the inner wall 7. It is divided on the B side. Dividing plane A-A
A portion 10a of the first outer circumferential wall located on the outer side and the outer wall 9 are integrally formed and constitute a so-called end bracket 23. In addition, most part 10b and parting surface B are located on the first outer peripheral wall inside of dividing surface A-A.
- Most part 11a of the second outer peripheral wall outside B
and the intermediate wall 8 are integrally formed and constitute an intermediate bracket 24. Further, a part 11b of the second outer peripheral wall located inside the dividing plane B-B and the inner wall 7
is formed integrally with the inner bracket 25.

Tightening protrusions 26 and 27 are formed on both sides of the dividing surface A-A at appropriate intervals in the circumferential direction. A blind hole 28 is formed in the protruding piece 26 on the end bracket 23 side, and a screw hole 28 is formed in the protruding piece 27 on the intermediate bracket 24 side. The bolt 30 passes through the blank hole 28 and is screwed into the screw hole 29 to fasten the hoist shaft 23 and the intermediate bracket 24. Further, flanges 31 and 32 are formed on both sides of the dividing plane B-B. The flange 31 on the intermediate bracket 24 side is provided with blank holes 33 at appropriate intervals in the circumferential direction, and the flange 32 on the inner bracket 25 side is provided with corresponding screw holes 24. The bolt 35 passes through the blank hole 33 and is screwed into the screw hole 34, and is attached to the intermediate bracket 2.
4 and the inner bracket 25 are fastened.

Additionally, holes 63 and 67 are formed in both the brackets 31 and 32 at positions different from the tightening portions of the bolts 35 and also at appropriate intervals in the circumferential direction. This stupid hole 3
Screw holes 38 are formed corresponding to holes 6 and 37. The bolt 39 passes through the blank holes 36 and 37 and is screwed into the screw hole 38. That is, this reduction gear device 3 is attached to the main body frame 1 with bolts 39.

The conventional hoist reduction gear device has been described above, but it has the following drawbacks.

(b) In order to perform maintenance and inspection of the reduction gear device,
It is necessary to remove it from a hoist installed at a high place and lower it to the ground, but since reduction gears are heavy objects, this work is extremely difficult and dangerous. In order to reduce the weight to some extent, the end bracket 23 and the first and second stage reduction gear sets 14 to 17 are removed, and then the bolt 39 is removed and the remaining parts are removed. Since the intermediate bracket 24, the inner bracket 25, and the third stage reduction gear set 18, 19 are integrated in the part shown in FIG.

(b) Since the first and second outer circumferential walls project in opposite directions with the intermediate wall as a border, when the first and second stage reduction gear sets are assembled, the third and third stage
When assembling the reduction gear set of the stage, the assembling direction is opposite, so it is necessary to reverse the whole assembly when one side is finished assembling. Including such a process of reversing heavy objects in the mass production process significantly reduces work efficiency.

(C) Each bracket is made of cast metal, and the intermediate bracket 24 in particular has a shape in which a part of the first outer peripheral wall 10 protrudes radially from the outer periphery of the flange 31, as shown in FIG. Therefore, when casting this, a core is required, and deburring work is also required after casting, which increases manufacturing man-hours and increases costs.

An object of the present invention is to set the outer shape of the intermediate bracket, which is formed by integrating the inner wall and a part of the first outer peripheral wall and, as appropriate, the intermediate wall and a part of the second outer peripheral wall, to only a non-circular shape. In addition, it is an object of the present invention to provide a reduction gear device for a hoist that eliminates the drawbacks of the above-mentioned prior art, can be easily disassembled and assembled at high places, can be assembled in one direction, and does not require a core when casting each bracket. be.

To achieve this objective, the present invention provides a dividing surface of the second outer wall between the intermediate wall and the inner wall near the middle wall, so that all or most of the second outer wall can be It is characterized in that it is formed integrally with the wall, and a mounting flange for attaching the entire reduction gear device to the main body frame is integrally formed on the outer periphery of the inner wall.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

In FIGS. 4 to 6, the same parts as in FIGS. 2 and 3 are designated by the same reference numerals. As is clear from the figure, also in this example, the first
The arrangement of the reduction gear sets 14 to 19 from stage to third stage is completely the same as the conventional one.

The major difference between this embodiment and the conventional one is the position of the dividing plane BB of the second outer peripheral wall 11. That is, the dividing plane B-B is provided at the intermediate wall 8, and almost the entire second outer peripheral wall 11 is provided at the inner wall 7.
is formed integrally with. Along with this, tightening protrusions 40 and 41 are formed on both sides of the dividing surface B-B at appropriate intervals in the circumferential direction, and a blank hole 42 is formed in the protrusion 40 on the intermediate bracket 24 side. A screw hole 43 is formed in the protruding piece 41 on the inner bracket 25 side. The bolt 44 passes through the hole 42 and is screwed into the screw hole 43 to fasten the intermediate bracket 24 and the inner bracket 25.

Further, a stud flange 45 is integrally formed on the outer periphery of the inner wall 7, and hole holes 46 are formed in the flange 45 at appropriate intervals in the circumferential direction. The body frame 1 has this stupid hole 46 as before.
A screw hole 38 is formed correspondingly. The bolt 39 passes through the blank hole 46 and is screwed into the screw hole 38.

With the above configuration, when it is necessary to lower the reduction gear device to the ground for maintenance and inspection, the end bracket 23 and the first and second stage reduction gear sets 14 to 17 are first removed in the same manner as in the past. Next, remove the bolt 44, remove the intermediate bracket 24, and then remove the third stage reduction gear set 1.
8 and 19, and finally remove the bolt 39 and remove the inner bracket 25. Also, assembly after maintenance and inspection is performed in the reverse order. In this way, the reduction gear system can be easily disassembled into small parts at high places, and can also be easily assembled. Therefore, the work can be carried out safely since there is no need to handle heavy objects at high places.

In addition, when mass producing reduction gear devices, first of all,
Place the inner bracket 25 down and install the third stage reduction gear sets 18 and 19. Next, install the intermediate bracket 24, and then install the first and second stage reduction gear sets 14 to 17. From there, attach the end bracket 23. Since it is possible to assemble from one direction without having to turn it over midway, the efficiency of assembly work is improved.

Further, as shown in FIG. 5, the intermediate bracket 24 has a non-circular outer shape and does not require a core during casting because it does not have a circular flange. As shown in FIG. 6, since there is no portion protruding in the radial direction from the outer periphery of the flange 45, no core is required during casting. Therefore, the number of manufacturing steps is reduced, making it possible to significantly reduce costs.

In addition, there may be a request to modify the hoist to a high-speed hoisting type by reducing the reduction ratio, but in that case, the second stage reduction gear set 16, 17 and the intermediate bracket 8 must be removed. With a few modifications, it can be made into a high-speed winding type with two-stage reduction.

As explained above, according to the present invention, disassembly and assembly at high places can be easily performed, so maintenance and inspection work can be performed safely, and
Since it can be assembled from one direction and a core is not required when casting each bracket, the number of manufacturing steps is reduced compared to the conventional method, and the cost can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the overall structure of a conventional hoist, Fig. 2 is a sectional view of a conventional hoist reduction gear device, Fig. 3 is a left side anatomical view of the intermediate bracket of the same device, and Fig. 4 is a sectional view showing the overall structure of a conventional hoist. 5 is a sectional view of a reduction gear device according to an embodiment of the present invention, FIG. 5 is a left side view of an intermediate bracket of the device, and FIG. 6 is a left side view of an inner bracket of the device. DESCRIPTION OF SYMBOLS 1... Body frame, 2... Motor, 3... Reduction gear device, 4... Winding drum, 7... Inner wall,
8... Intermediate wall, 9... Outer wall, 10... First outer peripheral wall, 11... Second outer peripheral wall, 12... First gear case, 13... Second gear case, 23...
End bracket, 24...Middle bracket, 2
5...Inner bracket, 45...Mounting flange,
A-A...dividing surface of the first outer peripheral wall, B-B... dividing surface of the second outer peripheral wall.

Claims (1)

[Claims] 1. An inner wall located on the winding drum side, an intermediate wall provided on the outside due to the inner wall, an outer wall provided on the outer side due to the twist, and an outer wall provided so as to surround the space between the outer wall and the intermediate wall. a first outer circumferential wall and a second outer circumferential wall provided to surround between the intermediate wall and the inner wall, the outer wall, the intermediate wall and the first outer circumferential wall forming a first gear case; A second gear case is formed by the intermediate wall, the inner wall, and the second outer peripheral wall, and the first outer peripheral wall is connected to the second outer peripheral wall between the outer wall and the intermediate wall. The wall is splittable between the intermediate wall and the inner wall, the outer wall and a portion of the first peripheral wall being integrated to form an end bracket, and the intermediate wall and the first peripheral wall being integral with each other to form an end bracket. A portion of the first outer circumferential wall and a portion of the second outer circumferential wall are integrated to form an intermediate bracket, and the inner wall and a portion of the second outer circumferential wall are integrated to form an inner bracket. In the case where the outer shape of the intermediate bracket includes a non-circular shape, the outer shape of the intermediate bracket is set only to a non-circular shape, and the second outer peripheral wall has a dividing surface near the intermediate wall. A hoist, wherein all or most of the hoist is formed integrally with the inner wall, and a mounting flange for attaching to the winding drum is integrally formed on the outer periphery of the inner wall. Reduction gear device for use.